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MAX8895WEWA+T
Li-Ion Chargers with Smart Power Selector, Adapter Type Detection, and USB Enumeration
Li-Ion Chargers with Smart Power Selector,
Adapter Type Detection, and USB Enumeration
MAX8895V/MAX8895W/
MAX8895X/MAX8895Y
EVALUATION KIT AVAILABLEOrdering Information and Typical Operating Circuit appear
at end of data sheet.
General Description
The MAX8895_ USB-compliant linear battery chargers
operate from either a USB port or dedicated charger with
automatic detection of adapter type and USB enumera-
tion capability. The MAX8895_ integrate the battery dis-
connect switch, current-sense circuit, MOSFET pass ele-
ments, and thermal regulation circuitry, and eliminate the
external reverse-blocking Schottky diode to create the
simplest and smallest stand-alone charging solutions.
The MAX8895_ includes an automated detection of
charge adapter type, making it possible to distinguish
between USB 2.0 device, USB charger, and dedicated
charger devices. Furthermore, the MAX8895_ include a
USB enumeration function that automatically negotiates
with a USB host, making it possible to achieve the highest
current available from a USB 2.0 device or USB charger
without processor intervention. The adapter type detec-
tion is compliant with USB 2.0 specification as well as USB
charging Revision 1.1.
The MAX8895_ controls the charging sequence for single-
cell Li+ batteries from initial power-OK indication, through
prequalification, fast-charge, top-off, and finally charge
termination. Charging is controlled using constant cur-
rent, constant voltage, and constant die-temperature
(CCCVCTj) regulation for safe operation under all condi-
tions. The maximum charging current is adaptively con-
trolled by subtracting the system current from the input
current limit, ensuring that the charging current is always
maximized for any given operating condition.
The MAX8895_ features optimized smart power control
to make the best use of limited USB or adapter power.
Battery charge current is set independently of the
SYS_ input current limit. Power not used by the system
charges the battery. Automatic input selection switches
the system from battery to external power. This allows
the application to operate without a battery, discharged
battery, or dead battery.
Other features include undervoltage lockout (UVLO),
overvoltage protection (OVP), charge status flag, charge
fault flag, power-OK monitor, battery thermistor monitor,
charge timer, and a 3.3V output.
The MAX8895_ operates from a +4.0V to +6.6V sup-
ply and include overvoltage protection up to +16V. The
MAX8895_ is specified over the extended temperature
range (-40NC to +85NC) and are available in a compact
2.36mm x 2.36mm, 25-bump WLP package (0.4mm pitch).
Features
S Enables Charging from a USB Port*
S Automatic Detection of Adapter Type
S Enumeration Capability Without Processor
Intervention
S USB Low-Speed Operation Without External
Crystal (MAX8895V/MAX8895W/MAX8895X)
S USB Full-Speed Operation Using an External
Crystal (MAX8895Y)
S Compliant with USB 2.0 Specification
S Compliant with USB Charging Specification
(Revision 1.1)
S Adaptive Input Current Limit for Dedicated
Charger
S Input Overvoltage Protection to 16V
S Automatic Current Sharing Between Battery
Charging and System
S Smart Power SelectorK Allows Operation with
Discharged or No Battery
S NTC Monitoring of Battery Temperature
S No External MOSFETs Required
S Thermal Regulation Prevents Overheating
S 2µA Shutdown Current
S Tiny 2.36mm x 2.36mm, 25-Bump, 0.4mm Pitch
WLP Package
Applications
Bluetooth® Headsets
Charging Cradles
Portable Devices
Smart Power Selector is a trademark of Maxim Integrated
Products, Inc.
Bluetooth is a registered trademark of Bluetooth SIG.
Li-Ion Chargers with Smart Power Selector,
Adapter Type Detection, and USB Enumeration
MAX8895V/MAX8895W/MAX8895X/MAX8895Y
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
BUS_ to AGND ...................................................-0.3V to +16.0V
XIN, XOUT, INT_3V3 to AGND .............................-0.3V to +4.0V
ENU_EN, SUS_EN, RWU, D+, D-, PREQ, CHG, UOK,
FLT, BAT_, SYS_, CEN, STDBY, DET_DONE,
IBUS_DEF, CHG_TYPE to AGND .....................-0.3V to +6.0V
KB_TM, ISET, THM, IDN,
CT to AGND ...................................-0.3V to (VINT_3V3 + 0.3V)
DGND to AGND ..................................................-0.3V to + 0.3V
IBUS_, IBAT_, and ISYS_ Continuous Current ...........1800mARMS
Continuous Power Dissipation (TA = +70NC)
25-Bump, 2.36mm x 2.36mm WLP
(derate 19.34mW/NC above +70NC) ..........................1560mW
Operating Temperature ......................................-40NC to +85NC
Junction Temperature .....................................................+150NC
Storage Temperature Range ............................-65NC to +150NC
Soldering Temperature (reflow) ......................................+260NC
ELECTRICAL CHARACTERISTICS
(THM = CEN = SUS_EN = AGND, VBAT_ = 4.2V, VBUS_, CT, PREQ, CHG, UOK, FLT, DET_DONE are unconnected, TA = -40NC to
+85NC, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1)
ABSOLUTE MAXIMUM RATINGS
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
USB-TO-SYS PREREGULATOR
USB Operating RangeInitial VBUS_ voltage before enabling charger4.06.6V
USB Standoff VoltageVBAT_ = VSYS_ = 0V, IBUS_ < 650FA (max)14V
BUS_OK Debounce TimertUSB_DBTime from BUS_ within valid range until UOK
logic-low500650ms
USB Undervoltage Lockout
Threshold
UOK logic-low,
VBUS_ rising,
100mV hysteresis
Before initial detection of
external device3.854.04.15
UOK logic-low,
VBUS_ falling
USB 2.0 low-power
device3.753.94.05
UOK logic-low,
VBUS_ falling
USB 2.0 high-power
device3.954.14.25
UOK logic-low,
VBUS_ falling
Dedicated charger or
USB charger
VSYS _
- 100mV
VSYS_
+ 50mV
VSYS_
+ 200mV
USB Overvoltage Protection
Threshold
UOK logic-low, VBUS_ rising, 100mV
hysteresis6.86.957.1V
USB Input Supply Current
(Note 2)
IDETECT
Charge type detection,
ISYS_ = IBAT_ = 0mA,
VCEN = 0V
MAX8895V/
MAX8895W/
MAX8895X
MAX8895Y2.5
IENUMERATEUSB 2.0 enumeration in progress,
ISYS_ = IBAT_ = 0mA, VCEN = 0V100
ISUSPENDSuspend mode, ISYS_ = IBAT_ =
0mA, VSTDBY = 3.3V
MAX8895V/
MAX8895W/
MAX8895X
MAX8895Y2.5
IUSB_100mAUSB 2.0 low-power
device detected
TA = 0NC to +85NC100
TA = -40NC to +85NC102.5
IUSB_500mAUSB 2.0 high-power device detected500
USB Input Current Limit
ISUSDuring suspend0IENUDuring USB enumeration404555
Li-Ion Chargers with Smart Power Selector,
Adapter Type Detection, and USB Enumeration
MAX8895V/MAX8895W/MAX8895X/MAX8895Y
ELECTRICAL CHARACTERISTICS (continued)
(THM = CEN = SUS_EN = AGND, VBAT_ = 4.2V, VBUS_, CT, PREQ, CHG, UOK, FLT, DET_DONE are unconnected, TA = -40NC to
+85NC, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
VBUS_-to-VSYS_ On-
ResistanceVBUS_ = VCEN = 5V, ISYS_ = 400mA200320mI
VSYS_-to-VBAT_ Reverse
Regulation
When SYS is in regulation and charging
stops, VSYS_ falling, 50mV hysteresis
VBAT_
- 80mV
VBAT_
- 50mV
VBAT_
- 20mVV
Input Limiter Soft-Start TimeInput current ramp time50100Fs
Thermal-Limit Start
TemperatureTDIE_LIM+110NC
Thermal-Limit Start
Temperature Hysteresis10NC
Thermal-Limit GainISYS_ reduction/die temperature (above +110NC)5%/NC
VBUS_ Adaptive Current
Regulation Threshold
VBUS_ regulation threshold where input
current limit is regulated for dedicated
charger or USB charger
VSYS_ +
440mV
VSYS_ +
550mV V
SYS_ Regulation VoltageVBAT_ > 3.45V, ISYS_ = 1mA to 1.6A,
VBUS_ = VCEN = 5V
VBAT_ +
140mV
VBAT_ +
210mVV
Minimum SYS Regulation
Voltage
VBUS_ = 6V, ISYS_ = 1mA to 1.6A,
VCEN = 5V3.33.43.55V
CHARGER
BAT_-to-SYS_ On-ResistanceISYS_ = 200mA5580mI
BAT_ Undervoltage LockoutVBAT_UVLO_FVBAT_ falling2.602.853.1VVBAT_UVLO_RVBAT_ rising2.753.003.25
Charger Soft-Start TimeCharge-current ramp time1ms
BAT_ Leakage CurrentVBUS_ not connected26FAVBUS_ connected, VCEN = 5V26
PRECHARGE MODE
BAT_ Precharge-Current
Set RangeIPCHGRISET = 30kI to 1.875kI, VBAT_ >1.4V
(Note 3)IFCHG/10A
BAT_ Prequalification
Threshold
VBAT_PCHG_RVBAT_ rising2.72.82.9VVBAT_PCHG_FVBAT_ falling2.62.72.8
FAST-CHARGE MODE
BAT_ Charge-Current Set
Range IFCHG
RISET = 30kI to 1.875kI, VBAT_ >1.4V
(Note 3)0.11.85A
ISET = INT_3V3 (Note 3)600mA
BAT_ Charge-Current
Accuracy, Charger Loop in
Control
VBUS_ = 5.5V
(Note 3)
RISET = 1.875kI000018500000RISET = 5kI540600660
RISET = 30kI90100110
BAT_ Fast-Charge Threshold
VBAT_FCHG_RVBAT_ rising threshold, where charging
current IFCHG is reduced to ITCHG 3.94.04.1
VBAT_FCHG_FVBAT_ falling threshold, where charging
current is increased to IFCHG3.73.83.9
Li-Ion Chargers with Smart Power Selector,
Adapter Type Detection, and USB Enumeration
MAX8895V/MAX8895W/MAX8895X/MAX8895Y
ELECTRICAL CHARACTERISTICS (continued)
(THM = CEN = SUS_EN = AGND, VBAT_ = 4.2V, VBUS_, CT, PREQ, CHG, UOK, FLT, DET_DONE are unconnected, TA = -40NC to
+85NC, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
TOP-OFF CHARGE MODE
Top-Off Charge Current ITCHGRISET = 30kI to 1.875kI (Note 3)0.6 x
IFCHGA
BAT_ Charge Termination
Current RangeICHG_DONERIDN = 240kI to 15kI10160mAIDN = INT_3V380
BAT_ Regulation VoltageVBAT_REGIBAT_ = 0mATA = +25NC4.1794.2004.221VTA = 0NC to +85NC4.1584.2004.242
BAT_ Recharge ThresholdVBAT_RECHGRecharge threshold in relation to VBAT_ in DONE
state going into top-off mode (Figure 20)-100-200-300mV
CHARGE TIMER
Maximum Prequalification
TimetPCHG
From VCEN falling to
end of prequalification
charge mode,
VBAT_ = 2.5V
CT = 0.068FF16
Min
CT = AGND20
Maximum Fast-Charge TimetFCHGFrom VCEN falling to
VFLT falling
CT = 0.068FF100MinCT = AGND120
Maintain-Charge TimetMTCHGCT = 0.068FF4MinCT = AGND5
Timer AccuracyCT = 0.068FF-30+30%CT connected to AGND-30+30
Timer Extend ThresholdPercentage of charge current below which
timer clock operates at half speed50%
Timer Suspend ThresholdPercentage of charge current below which
timer clock pauses20%
ADAPTER TYPE DETECTION
D- Current SinkIDM_SINKMAX8895V/MAX8895X/MAX8895Y5086150FAMAX8895W6486102
D+ Source VoltageVDP_SRCIDP_SRC = 0 to 200FA0.50.60.7V
D+ Detection ThresholdVDAT_REF0.250.320.40V
D+ Source On-TimetDP_SRC_ON100ms
D+ Source to High Current TimetDP_SRC_HC40ms
D- Pullup ResistorRDM_PUMAX8895V/MAX8895W/MAX8895X only,
external series resistor = 33I1.4251.5001.575kI
D+ Pullup ResistorRDP_PUMAX8895Y only, external series resistor =
33I1.4251.5001.575kI
D+ Charger Detection
Pullup ResistorRDP_CD_PURDP_CD_PU connect to INT_3V3200330600kI
D- Weak Current SinkIDM_CD_PD0.1FA
D- Logic-High ThresholdVDM_IH0.82.0V
Li-Ion Chargers with Smart Power Selector,
Adapter Type Detection, and USB Enumeration
MAX8895V/MAX8895W/MAX8895X/MAX8895Y
ELECTRICAL CHARACTERISTICS (continued)
(THM = CEN = SUS_EN = AGND, VBAT_ = 4.2V, VBUS_, CT, PREQ, CHG, UOK, FLT, DET_DONE are unconnected, TA = -40NC to
+85NC, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Enumeration Time LimittENUM
Time from start of enumeration process
until enumeration must be completed; if
not completed, the MAX8895_ retries to
enumerates
Reconnect TimertFAULTTime from failed enumeration to adapter type
detection reenabled 3s
Enumeration Fail to Reconnect
TimertENU_FAULT
Time from enumeration fail at 500mA until
enumeration is retried at 100mA or time from
enumeration fail at 100mA until reconnect
timer is startedms
Reenumeration TimertRE_ENUM
Time from when the MAX8895_ has entered
suspend mode until it reenumerates,
RWU = AGND
100ms
Oscillator Frequency
Accuracy
MAX8895V/MAX8895X only (internal
oscillator), TA = +25NC5.916.006.09MHz
XIN Input CurrentMAX8895Y only, VXIN = VSTDBY = 3.3V10FA
XIN Logic-High Input VoltageMAX8895Y only2/3x
VINT_3V3VINT_3V3V
XIN Logic-Low Input VoltageMAX8895Y only0.4V
THM
THM Cold ThresholdTAMB_COLDWhen charging is suspended, rising
threshold, 2% hysteresis727476% of
VINT_3V3
THM Hot ThresholdTAMB_HOTWhen charging is suspended, falling
threshold, 2% hysteresis262830% of
VINT_3V3
THM Threshold, DisabledWhen THM function is disabled, falling
threshold, 2% hysteresis3% of
VINT_3V3
THM Input LeakageTHM = AGND or
INT_3V3
TA = +25NC-0.10.001+0.2FATA = +85NC0.01
LOGIC I/O: CHG, FLT, UOK, CEN, PREQ, KB_TM, RWU, STDBY, SUS_EN, ENU_EN, DET_DONE, CHG_TYPE, IBUS_DEF
Logic-Input Threshold
High level1.3VLow level0.4
Hysteresis50mV
Logic-Input Leakage CurrentVBUS_ = 0 to 5.5VTA = +25NC0.0011FATA = +85NC0.01
Logic-Low Output Voltage
(CHG, FLT, UOK, PREQ,
DET_DONE, CHG_TYPE Only)
Sinking 10mA 35100mV
Logic-High Output-Leakage
Current (CHG, FLT, UOK,
PREQ, DET_DONE, CHG_
TYPE Only)
VSYS_ = 5.5V
TA = +25NC0.0011
TA = +85NC0.01
Li-Ion Chargers with Smart Power Selector,
Adapter Type Detection, and USB Enumeration
MAX8895V/MAX8895W/MAX8895X/MAX8895Y
Note 1: Specifications are 100% production tested at TA = +25NC. Limits over the operating temperature range are guaranteed by
design and characterization.
Note 2: Sum of input current limit and current used for INT_3V3.
Note 3: Maximum charging current is adaptively regulated to IIN_LIM - ISYS_ with a maximum value of ICHG.
Note 4: All devices are 100% production tested at TA = +25NC. Limits over the operating temperature range are guaranteed by design.
Note 5: Guaranteed by design, not production tested.
ELECTRICAL CHARACTERISTICS (continued)
(THM = CEN = SUS_EN = AGND, VBAT_ = 4.2V, VBUS_, CT, PREQ, CHG, UOK, FLT, DET_DONE are unconnected, TA = -40NC to
+85NC, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
USB DATA INTERFACE
Differential-Receiver Input
Sensitivity|VD+ - VD-|0.2V
Differential-Receiver
Common-Mode Voltage0.82.5V
D+, D- Input Impedance300kI
D+, D- Output Low Voltage VOLRLOAD = 1.5kI from VD- to 3.6V0.3V
D+, D- Output High Voltage VOHRLOAD = 15kI from D+ and D- to AGND2.83.6V
Driver Output ImpedanceExcludes external resistor2711I
BUS_ Idle TimetIDLE
Only valid when an adapter type is detected
as a USB 2.0 device; time BUS_ is inactive
until charging current is reduced to ISUSPENDms
USB Host Remote Wake-Up
TimertRWU
Time delay from when the MAX8895_ is put
into suspend mode until they request the host
for a remote wake-up
100ms
D+, D- Rise Time
(Note 5)tRISE
MAX8895V/MAX8895W/MAX8895X only, CL =
50pF to 600pF, (Figures 5 and 6)75250ns
MAX8895Y only, CL = 50pF (Figures 5 and 6)420
D+, D- Fall Time
(Note 5)tFALL
MAX8895V/MAX8895W/MAX8895X only, CL =
50pF to 600pF (Figures 5 and 6)75250MAX8895Y only, CL = 50pF
(Figures 5 and 6)420
Rise-/Fall-Time Matching
(Note 5)
MAX8895V/MAX8895W/MAX8895X only, CL =
50pF to 600pF (Figures 5 and 6)80120MAX8895Y only, CL = 50pF
(Figures 5 and 6)90110
Output-Signal Crossover
Voltage (Note 5)
MAX8895V/MAX8895W/MAX8895X only, CL =
50pF to 600pF (Figures 5 and 6)1.32.0MAX8895Y only, CL = 50pF
(Figures 5 and 6)1.32.0
INT_3V3 REGULATOR
INT_3V3 VoltageVBUS_= 5V, IINT_3V3 = 0 to 10mA3.03.33.6V
ESD PROTECTION (D+, D-, VBUS_)
Human Body ModelVBUS_ bypassed with 1FF to AGNDQ8kV
Li-Ion Chargers with Smart Power Selector,
Adapter Type Detection, and USB Enumeration
MAX8895V/MAX8895W/MAX8895X/MAX8895Y
Typical Operating Characteristics
(VBAT_ = 4.2V, VBUS_ = 5V, ISET = IDN = CT = SUS_EN = INT_3V3, STDBY = ENU_EN = RWU = CEN = KB_TM = AGND, circuits
of Figures 4 and 5 (MAX8895V/MAX8895X and MAX8895Y, respectively), TA = +25NC, unless otherwise noted.)
MAX8895V/W/X VBUS_ INPUT SUPPLY
CURRENT vs. VBUS_ (SUSPEND MODE)
MAX8895W/X/Y toc01
VBUS_ (V)
INPUT SUPPLY CURRENT (µA)12246810
SUS_EN = ENU_EN = CEN = AGND
STDBY = INT_3V3
MAX8895Y VBUS_ INPUT SUPPLY
CURRENT vs. VBUS_ (SUSPEND MODE)
MAX8895W/X/Y toc04
VBUS_ (V)
INPUT SUPPLY CURRENT (µA)12810462
CEN = STDBY = AGND
MAX8895V/W/X VBUS_ INPUT SUPPLY
CURRENT vs. VBUS_ (CHARGER ENABLED)
MAX8895W/X/Y toc02
VBUS_ (V)
INPUT SUPPLY CURRENT (mA)12108642
BATT UNCONNECTED
SUS_EN = ENU_EN
= CEN = AGND
MAX8895Y VBUS_ INPUT SUPPLY
CURRENT vs. VBUS_ (CHARGER ENABLED)
MAX8895W/X/Y toc05
VBUS_ (V)
INPUT SUPPLY CURRENT (mA)12810462
BATTERY UNCONNECTED
CEN = AGND
MAX8895V/W/X VBUS_ INPUT SUPPLY
CURRENT vs. VBUS_ (CHARGER DISABLED)
MAX8895W/X/Y toc03
VBUS_ (V)
INPUT SUPPLY CURRENT (mA)12108642
VBAT_ = 4.2V
CEN = INT_3V3
SUS_EN =
ENU_EN = AGND
MAX8895Y VBUS_ INPUT SUPPLY
CURRENT vs. VBUS_ (CHARGER DISABLED)
MAX8895W/X/Y toc06
VBUS_ (V)
INPUT SUPPLY CURRENT (mA)12810462
VBAT_ = 4.2V
CEN = INT_3V3
BATTERY LEAKAGE CURRENT
vs. BATTERY VOLTAGE
MAX8895W/X/Y toc07
LEAKAGE CURRENT (µA)
BUS_ UNCONNECTED
CEN = AGND
BATTERY LEAKAGE CURRENT
vs. TEMPERATURE
MAX8895W/X/Y toc08
LEAKAGE CURRENT (µA)3510-15
CHARGE CURRENT vs. BATTERY VOLTAGE
(DEDICATED CHARTER)
MAX8895W/X/Y toc09
CHARGE CURRENT (mA)
ENU_EN = SUS_EN = AGND, RISET = 5kI
Li-Ion Chargers with Smart Power Selector,
Adapter Type Detection, and USB Enumeration
MAX8895V/MAX8895W/MAX8895X/MAX8895Y
Typical Operating Characteristics (continued)
(VBAT_ = 4.2V, VBUS_ = 5V, ISET = IDN = CT = SUS_EN = INT_3V3, STDBY = ENU_EN = RWU = CEN = KB_TM = AGND, circuits
of Figures 4 and 5 (MAX8895V/MAX8895X and MAX8895Y, respectively), TA = +25NC, unless otherwise noted.)
CHARGE CURRENT vs. BATTERY VOLTAGE
(LOW-POWER USB)
MAX8895W/X/Y toc10
BATTERY VOLTAGE (V)
CHARGE CURRENT (mA)
ENU_EN = INT_3V3, SUS_EN = AGND
CHARGE CURRENT vs. BATTERY VOLTAGE
(HIGH-POWER USB)
MAX8895W/X/Y toc11
BATTERY VOLTAGE (V)
CHARGE CURRENT (mA)
ENU_EN = SUS_EN = AGND
CHARGER IN DROPOUT
CHARGE CURRENT (DEDICATED CHARGER)
vs. AMBIENT TEMPERATURE
MAX8895W/X/Y toc12
TEMPERATURE (°C)
CHARGE CURRENT (mA)3510-15
BATTERY REGULATION VOLTAGE
vs. AMBIENT TEMPERATURE
MAX8895W/X/Y toc13
TEMPERATURE (°C)
BATTERY REGULATION VOLTAGE (V)3510-15
SYS_ OUTPUT VOLTAGE
vs. VBUS_
MAX8895W/X/Y toc14
VBUS_ (V)
SYS_ OUTPUT VOLTAGE (V)654
ISYS_ = 0mA
ISYS_ = 20mA
VBAT_ = 4.2V
SYS_ OUTPUT VOLTAGE
vs. BATTERY VOLTAGE
MAX8895W/X/Y toc15
VBATT (V)
SYS_ OUTPUT VOLTAGE (V)
ISYS_ = 100mA
VBUS_ = 5V
ISYS_ = 0A
SYS_ DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX8895W/X/Y toc16
SYS_ DROPOUT VOLTAGE (mV)
BUS_ UNCONNECTED
DROPOUT MEASURED WHEN
SYS_ DECREASES BY 10%
SYS_ OUTPUT VOLTAGE vs. LOAD CURRENT
(HIGH-POWER USB MODE)
MAX8895W/X/Y toc17
SYS_ OUTPUT VOLTAGE (V)
SYSTEM LOAD SWITCH
IN DROPOUT
VSYS_ SUPPLEMENTED
BY VBUS_
VBAT_ = 4.2V
SYS_ OUTPUT VOLTAGE vs. LOAD CURRENT
(DEDICATED CHARGER)
MAX8895W/X/Y toc18
SYS_ OUTPUT VOLTAGE (V)
SYSTEM LOAD SWITCH IN DROPOUT
VSYS_ SUPPLEMENTED
BY VBUS_
VBAT_ = 4.2V, NOKIA AC-10U
Li-Ion Chargers with Smart Power Selector,
Adapter Type Detection, and USB Enumeration
MAX8895V/MAX8895W/MAX8895X/MAX8895Y
Typical Operating Characteristics (continued)
(VBAT_ = 4.2V, VBUS_ = 5V, ISET = IDN = CT = SUS_EN = INT_3V3, STDBY = ENU_EN = RWU = CEN = KB_TM = AGND, circuits
of Figures 4 and 5 (MAX8895V/MAX8895X and MAX8895Y, respectively), TA = +25NC, unless otherwise noted.)
INT_3V3 VOLTAGE vs. BUS_ VOLTAGE
MAX8895W/X/Y toc19
VBUS_ (V)
INT_3V3
(V)
100mA CHARGE
CURRENT
VBAT_ = 4V
50mA CHARGE
CURRENT
CHARGE PROFILE
(USB 2.0 CHARGER)
MAX8895W/X/Y toc21
TIME (min)
BATT
(V)
VBAT_
IBAT_
MOTOROLA BC60 860mAh
CCT = 0.2µF
RISET = 3.74kI
RIDN = 243kI
IBATT
(mA)
D+, D- SIGNALS (V)
MAX8895Y EYE DIAGRAM
MAX8895W/X/Y toc23
CHARGE PROFILE
(NOKIA AC-10 CHARGER)
MAX8895W/X/Y toc20
TIME (min)
BATT
(V)
IBATT
(mA)
MOTOROLA BC60 860mAh
CCT = 0.2µF
RISET = 1.87kI
RIDN = 243kI
VBAT_
IBAT_
TIME (x 10-7) (s)
D+, D- SIGNALS (V)
MAX8895V/W/X EYE DIAGRAM
MAX8895W/X/Y toc22
MAX8895W/X/Y toc24
5V/div
5V/div
5V/div
5V/div
VD-
VD+
VSYS
VBUS
200ms/div
DEDICATED CHARGER CONNECT
Li-Ion Chargers with Smart Power Selector,
Adapter Type Detection, and USB Enumeration
MAX8895V/MAX8895W/MAX8895X/MAX8895Y
Typical Operating Characteristics (continued)
(VBAT_ = 4.2V, VBUS_ = 5V, ISET = IDN = CT = SUS_EN = INT_3V3, STDBY = ENU_EN = RWU = CEN = KB_TM = AGND, circuits
of Figures 4 and 5 (MAX8895V/MAX8895X and MAX8895Y, respectively), TA = +25NC, unless otherwise noted.)
MAX8895W/X/Y toc25
5V/div
5V/div
5V/div
5V/div
VBAT_
VSYS_
VINT_3V3
VBUS_
200ms/div
RSYS_ = 100I
DEDICATED CHARGER DISCONNECT
MAX8895W/X/Y toc27
5V/div
5V/div
5V/div
500mA/div
VD-
VD+
IBUS
VBUS
400ms/div
MAX8895Y USB HIGH-POWER
2.0 CONNECT
MAX8895W/X/Y toc29
0mA
5V/div
2V/div
2V/div
200mA/div
VD-
VD+
VBUS_
IBUS_
RSYS_ = 100I
MAX8895Y USB HIGH-POWER
2.0 DISCONNECT
MAX8895W/X/Y toc26
5V/div
5V/div
5V/div
500mA/div
VD-
VD+
IBUS
VBUS
400ms/div
MAX8895V/W/X HIGH-POWER 2.0
MAX8895W/X/Y toc28
0mA
5V/div
2V/div
2V/div
100mA/div
VD-
VD+
VBUS_
IBUS_
20ms/div
RSYS_ = 100I
MAX8895V/W/X USB HIGH-POWER
2.0 DISCONNECT
MAX8895W/X/Y toc30
0mA
2V/div
1V/div
200mA/div
2V/div
IBUS_
VD+
VD-
VFLT
MAX8895V/W/X USB AUTOSUSPEND
Li-Ion Chargers with Smart Power Selector,
Adapter Type Detection, and USB Enumeration
MAX8895V/MAX8895W/MAX8895X/MAX8895Y
Typical Operating Characteristics (continued)
(VBAT_ = 4.2V, VBUS_ = 5V, ISET = IDN = CT = SUS_EN = INT_3V3, STDBY = ENU_EN = RWU = CEN = KB_TM = AGND, circuits
of Figures 4 and 5 (MAX8895V/MAX8895X and MAX8895Y, respectively), TA = +25NC, unless otherwise noted.)
MAX8895W/X/Y toc31
0mA
2V/div
1V/div
200mA/div
2V/div
IBUS_
VD+
VD-
1ms/div
VFLT
MAX8895Y USB AUTOSUSPEND
MAX8895W/X/Y toc33
0mA
2V/div
200mA/div
2V/div
2V/div
IBUS_
VD+
VD-
1s/div
VFLT
MAX8895Y USB RESUME
MAX8895W/X/Y toc32
0mA
2V/div
1V/div
200mA/div
2V/div
IBUS_
VD+
VD-
1s/div
VFLT
MAX8895V/W/X USB RESUME
PREQUALIFICATION TIMEOUT
vs. CT CAPACITANCE
MAX8895W/X/Y toc34
CCT (pF)
PREQUALIFICATION TIMEOUT (s)
80,00060,00020,00040,000
1600100,000
FAST-CHARGE TIMEOUT
vs. CT CAPACITANCE
MAX8895W/X/Y toc35
FAST-CHARGE TIMEOUT (s)
80,00060,00040,00020,000
1,000
2,000
3,000
4,000
5,000
6,000
7,000
8,000
9,000
10,000100,000
Li-Ion Chargers with Smart Power Selector,
Adapter Type Detection, and USB Enumeration
MAX8895V/MAX8895W/MAX8895X/MAX8895Y
Pin Configurations
TOP VIEW
(BUMP SIDE DOWN)
WLP
ISETSTDBYBAT_ASYS_ABUS_A
IDNCHGBAT_BSYS_BBUS_B
ENU_ENPREQUOKKB_TMAGND
SUS_ENRWUCENFLTD+THMINT_3V3DGNDD-
MAX8895V
MAX8895X
TOP VIEW
(BUMP SIDE DOWN)
WLP
ISETSTDBYBAT_ASYS_ABUS_A
IDNCHGBAT_BSYS_BBUS_B
XINPREQUOKKB_TMAGND
XOUTRWUCENFLTD+THMINT_3V3DGNDD-
MAX8895Y
TOP VIEW
(BUMP SIDE DOWN)
WLP
ISETSTDBYBAT_ASYS_ABUS_A
IDNCHG_
TYPEBAT_BSYS_BBUS_B
ENU_ENDET_DONEUOKKB_TMAGND
SUS_ENIBUS_DEFCENFLTD+THMINT_3V3DGNDD-
MAX8895W
Li-Ion Chargers with Smart Power Selector,
Adapter Type Detection, and USB Enumeration
MAX8895V/MAX8895W/MAX8895X/MAX8895Y
Pin Description
PIN
NAME
FUNCTIONMAX8895WMAX8895V/
MAX8895XMAX8895YISETISETISET
Maximum Fast-Charge Current Selection. Connect a resistor from ISET to
AGND to set the fast-charge current from 0.1A to 1.85A.
IFCHG = 3000/RISET
If ISET is connected to INT_3V3 the default IFCHG is set as maximum charge
current.
ISET can also be used to monitor the actual current charging the battery.
See the Monitoring Charge Current section for details.STDBYSTDBYSTDBY
Standby Mode Enable. Connect STDBY to AGND to enter automatic detect
mode. In automatic detect mode, the MAX8895V/MAX8895W/MAX8895X
determine when to enter suspend mode depending on the status of the
SUS_EN logic input. When using the MAX8895Y, the IC always starts in
automatic suspend mode. Connect STDBY to INT_3V3 or drive logic-high to
force the MAX8895_ into suspend mode regardless of external conditions.
A3 BAT_ABAT_ABAT_A
Li+ Battery Connection (VBAT_). Connect a single-cell Li+ battery from VBAT_
to DGND. The battery charges from VSYS_ when a valid source is present
at VBUS_. VBAT_ powers VSYS_ when VBUS_ power is not present, or when
the VSYS_ load exceeds the input current limit. Bypass VBAT_ to DGND with
a 10FF X5R or X7R ceramic capacitor. Both BAT_A and BAT_B must be
connected together externally.BAT_BBAT_BBAT_BSYS_ASYS_ASYS_A
System Supply Output (VSYS_). VSYS_ is connected to VBAT_ through an
internal 55mI system load switch when VBUS_ is invalid, or when the VSYS_
load is greater than the input current limit. When a valid voltage is present
at VBUS_, VSYS_ is limited to 4.35V when using the MAX8895V/MAX8895X/
MAX8895Y, and 4.53V when using the MAX8895W. When the system load
current (ISYS_) exceeds the VBUS_ current limit VBAT_ also powers VSYS_ to
maintain the load current. Bypass VSYS_ to DGND with a 10FF X5R or X7R
ceramic capacitor. Both SYS_A and SYS_B must be connected together
externally.SYS_BSYS_BSYS_BBUS_ABUS_ABUS_AUSB Power Input (VBUS_). During initial connection of an external device,
the MAX8895_ identifies the type of connection established and set the input
current limit accordingly. Bypass VBUS_ to DGND with a 10FF X5R or X7R
ceramic capacitor. Both BUS_A and BUS_B must be connected together
externally.B5BUS_BBUS_BBUS_BIDNIDNIDN
Charge Termination Current Threshold. Connect a resistor from IDN to AGND
to set the termination current threshold from 10mA to 160mA.
ITERM = 2400/RIDN
If IDN is connected to INT_3V3, the termination current is set to the default
ICHG_DONE threshold.
Li-Ion Chargers with Smart Power Selector,
Adapter Type Detection, and USB Enumeration
MAX8895V/MAX8895W/MAX8895X/MAX8895Y
Pin Description (continued)
PIN
NAME
FUNCTIONMAX8895WMAX8895V/
MAX8895XMAX8895YCHGCHG
Active-Low, Charging Indicator. CHG is an open-drain output that is pulled
low when the battery is in prequalification mode, fast-charge mode, or top-off
states. Otherwise, CHG is high impedance.
CHG_TYPE——
CHG_TYPE is used to indicate capacity of input current. IF CHG_TYPE is
high, the input current can be greater than or equal to 500mA. If CHG_TYPE
is low, the input current is 100mA from the USB 2.0 host.—XIN
Crystal Oscillator Input. Connect XIN to one side of a parallel resonant
12MHz ±0.25% crystal and a capacitor to AGND. XIN can also be driven by
an external clock referenced to INT_3V3.ENU_EN—
Automatic Enumeration Enable. Connect ENU_EN to AGND to allow the
MAX8895V/MAX8895X to automatically perform enumeration. Connect to
INT_3V3 or drive logic-high to force the input current limit to 100mA without
performing an adapter type detection.
ENU_EN——
Automatic Enumeration Enable. Connect ENU_EN to AGND to allow the
MAX8895W to automatically perform enumeration. By connecting ENU_EN
to INT_3V3 or drive logic-high, disables automatic enumeration and sets the
input current limit to level determined by the IBUS_DEF if a USB 2.0 device is
detected. PREQPREQActive-Low, Prequalification Charging Output. PREQ is an open-drain output
that is pulled low when the charger enters the prequalification state.
DET_DONE——
Active-Low Adapter-Type Detection Done Output. DET_DONE is an open-
drain output that is pulled low when adapter detection is completed. DET_
DONE is high impedance in suspend mode.UOKUOKUOKActive-Low, VBUS_ Power-OK Output. UOK is an open-drain output that is
pulled low when a valid input is detected at VBUS_.KB_TMKB_TMKB_TMKeyboard Test Mode. In normal operation, connect KB_TM to AGND. This
input is only used during USB certification.AGNDAGNDAGNDAnalog Ground. Both AGND and DGND should be connected together at the
negative terminal of the battery.—XOUT
Crystal Oscillator Output. Connect XOUT to one side of a parallel resonant
12MHz Q0.25% crystal and a capacitor to AGND. Leave XOUT unconnected
if XIN is driven by an external clock.
SUS_ENSUS_EN—
Automatic Suspend Mode Detection Enable. Connect SUS_EN to AGND
to disable the automatic suspend mode detection. Connect SUS_EN to
INT_3V3 or drive logic-high to enable the automatic detection of suspend
mode.RWURWU
Remote Wake-up. Connect RWU to AGND or logic-low for remote wake-
ups whenever the device is put into suspend mode and the supervisor
determines that more current is needed.
IBUS_DEF——
Sets USB Input Current if Adapter is Detected as a USB 2.0 Device and
ENU_EN is Logic-High. If IBUS_DEF is connected high, the input current limit
is set to 500mA. If IBUS_DEF is connected low or to ground, the input current
Li-Ion Chargers with Smart Power Selector,
Adapter Type Detection, and USB Enumeration
MAX8895V/MAX8895W/MAX8895X/MAX8895Y
Pin Description (continued)
PIN
NAME
FUNCTIONMAX8895WMAX8895V/
MAX8895XMAX8895YCENCENCEN
Charger Enable Input. Connect CEN to AGND to enable battery charging
when a valid source is connected at VBUS_. Connect CEN to INT_3V3 or
drive logic-high to disable battery charging. In this condition the USB state
machine is still active, and VSYS_ is powered from VBUS_ under normal
conditions and supplemented from VBAT_ if sufficient current is not available
from VBUS_ input.FLTFLTFLT
Active-Low Fault Output. FLT is an open-drain output that is pulled low when
the battery charger timer expires before prequalification or fast-charge
completes. FLT is also pulled low during adapter type detection or if USB
enumeration fails.D+D+D+
USB D+ signal. Connect D+ to a USB “B” connector through a 33I series
resistor. The 1.5kI D+ pullup resistor is internal to the device (for MAX8895Y
only).CTCTCT
Timer Set Capacitor. Connect a capacitor from CT to AGND to set the fault
timers for prequalification and fast-charge.
tPREQUAL = 16min x (CCT/0.068FF)
tFCHG = 100min x (CCT/0.068FF)
tMTCHG = 4min x (CCT/0.068FF)
If CT is connected directly to AGND, the default timers are used.THMTHMTHM
Thermistor Input. Connect a negative temperature coefficient (NTC)
thermistor that has good thermal contact with the battery from THM to AGND.
Connect a resistor equal to the thermistor at TA = +25NC resistance from
THM to INT_3V3. Charging is suspended when the thermistor is outside
the hot and cold limits. Connect THM to AGND to disable the thermistor
temperature sensor.INT_3V3INT_3V3INT_3V3
LDO Output. INT_3V3 is the output of an LDO that powers the internal
circuitry. INT_3V3 is powered from the VBUS_ input. Connect a 0.1FF
capacitor from INT_3V3 to AGND.DGNDDGNDDGNDDigital Ground. Both AGND and DGND should be connected together at the
negative terminal of the battery.D-D-D-
USB D- Signal. Connect D- to a USB “B” connector through a 33I series
resistor. The 1.5kI D- pullup resistor is internal to the device (for MAX8895V/
MAX8895W/MAX8895X only).
Li-Ion Chargers with Smart Power Selector,
Adapter Type Detection, and USB Enumeration
MAX8895V/MAX8895W/MAX8895X/MAX8895Y
Figure 1. MAX8895V/MAX8895X Block Diagram
Li+ BATTERY
CHARGER AND
SYS LOAD SWITCH
CHARGER
CURRENT
VOLTAGE
CONTROL
VBUS_
OUT OF
RANGE
VBUS_ VALID
USB POWER
MANAGEMENT
BUS_A
BUS_B
SYS_A
SYS_B
SET INPUT
CURRENT LIMIT
SET INPUT
CURRENT LIMIT
IC THERMAL
REGULATION
ILIMILIM-
ISYS
ISYS_
USB INTERFACE
LOGIC
POR
ILIM
RTB
RISET
RIDN
CCT
CINT_3V3
3.3V FOR INTERNAL
USB TRANSCEIVER
SYSTEM LOAD
ICHG_MAX
ICHG
USB ADAPTER
TYPE DETECTION
AND
ENUMERATION
UOK
RD+
GND
VBUS
BAT-
NTC
BAT+
RD-
SUPPORT REMOTE
WAKE-UP
FORCE REMOTE
WAKE-UP
CHARGING
TERMINATED
CHARGING
IN PROGRESS
PRECHARGING
TERMINATED
PRECHARGING
IN PROGRESS
RWU
AUTOMATED SUSPEND
ENABLED
AUTOMATED SUSPEND
DISABLED
SUS_EN
BAT_A
BAT_B
ISET
THM
INT_3V3
CHG
AUTOMATIC ENUMERATION
DISABLED
AUTOMATIC ENUMERATION
ENABLED
ENU_EN
KEYBOARD TEST MODE
ENABLED
KEYBOARD TEST MODE
DISABLED
KB_TM
FORCED STANDBY
MODE
AUTOMATIC STANDBY
MODE
STDBY
INT_3V3
NO FAULT
FAULT
CHARGER DISABLED
CHARGER ENABLED
DGNDAGND
THERMISTOR
MONITOR
CHARGE
TERMINATION
AND
MONITOR
CHARGE
TIMER
MAX8895V
MAX8895X
FLT
CEN
PREQ
IDN
Li-Ion Chargers with Smart Power Selector,
Adapter Type Detection, and USB Enumeration
MAX8895V/MAX8895W/MAX8895X/MAX8895Y
Figure 2. Differential Input Configuration
Li+ BATTERY
CHARGER AND
SYS LOAD SWITCH
CHARGER
CURRENT
VOLTAGE
CONTROL
VBUS_
OUT OF
RANGE
VBUS_ VALID
USB POWER
MANAGEMENT
BUS_A
BUS_B
SYS_A
SYS_B
INPUT
CURRENT LIMIT
SET INPUT
CURRENT LIMIT
IC THERMAL
REGULATION
ILIMILIM-
ISYS
ISYS_
USB INTERFACE
LOGIC
POR
ILIM
RTB
RISET
RIDN
CCT
CINT_3V3
3.3V FOR INTERNAL
USB TRANSCEIVER
SYSTEM LOAD
ICHG_MAX
ICHG
USB ADAPTER
TYPE DETECTION
AND
ENUMERATION
UOK
RD+
GND
VBUS
BAT-
NTC
BAT+
RD-
SUPPORT REMOTE
WAKE-UP
FORCE REMOTE
WAKE-UP
CHARGING
TERMINATED
CHARGING
IN PROGRESS
PRECHARGING
TERMINATED
PRECHARGING
IN PROGRESS
RWU
KEYBOARD TEST MODE
ENABLED
KEYBOARD TEST MODE
DISABLED
KB_TM
BAT_A
BAT_B
ISET
THM
INT_3V3
CHG
FORCED STANDBY
MODE
AUTOMATIC STANDBY
MODE
STDBY
INT_3V3
NO FAULT
FAULT
CHARGER DISABLED
CHARGER ENABLED
DGNDAGND
THERMISTOR
MONITOR
CHARGE
TERMINATION
AND
MONITOR
CHARGE
TIMER
MAX8895Y
FLT
CEN
PREQ
IDN
XIN
XOUT
OSCILLATOR
Li-Ion Chargers with Smart Power Selector,
Adapter Type Detection, and USB Enumeration
MAX8895V/MAX8895W/MAX8895X/MAX8895Y
Figure 3. MAX8895W Block Diagram
Li+ BATTERY
CHARGER AND
SYS LOAD SWITCH
CHARGER
CURRENT
VOLTAGE
CONTROL
VBUS_
OUT OF
RANGE
VBUS_ VALID
USB POWER
MANAGEMENT
BUS_A
BUS_B
SYS_A
SYS_B
INPUT
CURRENT LIMIT
SET INPUT
CURRENT LIMIT
THERMAL
REGULATION
ILIMILIM-
ISYS
ISYS_
USB INTERFACE
LOGIC
POR
ILIM
RTHM
RISET
RIDN
CINT_3V3
3.3V FOR USB
TRANSCEIVER
SYSTEM
LOAD
ICHG_MAX
ICHG
USB ADAPTER
TYPE DETECTION
AND
ENUMERATION
UOK
GND
VBUS
BAT-
NTC
BAT+
BAT_A
BAT_B
ISET
THM
INT_3V3
KEYBOARD TEST MODE ENABLED
KEYBOARD TEST MODE DISABLED
KB_TM
FORCED STANDBY MODE
AUTOMATIC STANDBY MODE
STDBY
INT_3V3
NO FAULT
FAULT
CHARGER DISABLED
CHARGER ENABLED
THERMISTOR
MONITOR
CHARGE
TERMINATION
AND
MONITOR
CHARGE
TIMER
MAX8895W
FLT
CEN
IDN
DGNDAGND
SUS_ENAUTOMATIC SUSPEND ENABLED
AUTOMATIC SUSPEND DISABLED
ENU_ENAUTOMATIC SUSPEND ENABLED
AUTOMATIC SUSPEND DISABLED
ADAPTER DETECTION IN PROGRESS
ADAPTER DETECTION COMPLETE
DET_DONE
CHG_TYPER500mA INPUT CURRENT LIMIT
100mA MAX. INPUT CURRENT LIMIT
IBUS_DEFINPUT CURRENT LIMIT SET TO 500mA
INPUT CURRENT LIMIT SET TO 100mA
CTIMER
Li-Ion Chargers with Smart Power Selector,
Adapter Type Detection, and USB Enumeration
MAX8895V/MAX8895W/MAX8895X/MAX8895Y
Figure 4. MAX8895V/MAX8895X Typical Application Circuit
BUS_A
MICRO
USB-B
BUS_B
SYS_A
SYS_B
RD+
GND
VBUS
CBUSCSYS
RD-
RWU
SUS_EN
ENU_EN
KB_TM
STDBY
PREQ
UOK
BAT_A
BAT_B
THM
INT_3V3
ISET
CBAT1-CELL Li+
RTB
CINT_3V3
RISET
RTPRTS
CCT
IDN
RIDN
CEN
CHG
FLT
DGNDAGND
MAX8895V
MAX8895X
NAMEVALUEFUNCTION
CBUS10FF, 16VDecoupling of input supply.
CSYS10FF, 6.3VDecoupling of system rail.
CBAT10FF, 6.3VDecoupling of battery rail.User dependentThermistor for thermal sensing. See the Thermistor Input (THM) section for details.
RTB, RTP, RTSUser dependentBias resistors for thermal sensing. See the Thermistor Input (THM) section for details.
CINT_3V30.1FF, 6.3VDecoupling of internal 3.3V rail.
CCT1000pF to 0.2FFCapacitor to set charge timer, optional. See the Fault Output (FLT) and Charge Timer (CT) section
for details.
RISET1.875kI to 30kIResistor to set maximum charging current, optional.
RIDN15kI to 240kIResistor to set termination current for charger, optional.
RD+, RD-33ID+/D- serial impedance.
Li-Ion Chargers with Smart Power Selector,
Adapter Type Detection, and USB Enumeration
MAX8895V/MAX8895W/MAX8895X/MAX8895Y
Figure 5. MAX8895Y Typical Application Circuit
BUS_A
MICRO
USB-B
BUS_B
SYS_A
SYS_B
RD+
GND
VBUS
CBUS
CXTAL_IN
CXTAL_OUT
XTAL
CSYS
RD-
RWU
KB_TM
STDBY
THM
INT_3V3
ISET
RTB
CINT_3V3
RISET
RTPRTS
CCT
IDN
RIDN
PREQ
UOK
CHG
FLT
CEN
XIN
XOUT
MAX8895Y
DGNDAGND
BAT_A
BAT_B
CBAT1-CELL Li+
NAMEVALUEFUNCTION
CBUS10FF, 16VDecoupling of input supply.
CSYS10FF, 6.3VDecoupling of system rail.
CBAT10FF, 6.3VDecoupling of battery rail.User dependentThermistor for thermal sensing. See the Thermistor Input (THM) section for details.
RTB, RTP, RTSUser dependentBias resistors for thermal sensing. See the Thermistor Input (THM) section for details.
CINT_3V30.1FF, 6.3VDecoupling of internal 3.3V rail.
XTAL12MHz 2500ppmMAX8895Y only, clock source for full-speed mode, requires a 2500ppm or better accuracy.
CXTAL_INUser dependentMAX8895Y only, crystal load capacitor, only required for full-speed operation. See the External
Crystal/Ceramic Resonator section for details.
CXTAL_OUTUser dependentMAX8895Y only, crystal load capacitor, only required for full-speed operation.
CCT1000pF to 0.2FFCapacitor to set charge timer, optional. See the Fault Output (FLT) and Charge Timer (CT) section
for details.
RISET1.875kI to 30kIResistor to set maximum charging current, optional.
RIDN15kI to 240kIResistor to set termination current for charger, optional.
Li-Ion Chargers with Smart Power Selector,
Adapter Type Detection, and USB Enumeration
MAX8895V/MAX8895W/MAX8895X/MAX8895Y
Figure 6. MAX8895W Typical Application Circuit
BUS_A
MICRO
USB-B
BUS_B
SYS_A
SYS_B
RD+
GND
VBUS
CBUSCSYS
RD-
DET_DONE
SUS_EN
ENU_EN
THM
INT_3V3
ISET
RTB
CINT_3V3
RISET
RTPRTS
CCT
IDN
RIDN
UOK
FLT
KB_TM
STDBY
CEN
CHG_TYPE
IBUS_DEF
MAX8895W
DGNDAGND
BAT_A
BAT_B
CBAT1-CELL Li+
RTHM
NAMEVALUEFUNCTION
CBUS10FF, 16VDecoupling of input supply.
CSYS10FF, 6.3VDecoupling of system rail.
CBAT10FF, 6.3VDecoupling of battery rail.
RTHMUser dependentThermistor for thermal sensing. See the Thermistor Input (THM) section for details.
RTB, RTP, RTSUser dependentBias resistors for thermal sensing. See the Thermistor Input (THM) section for details.
CINT_3V30.1FF, 6.3VDecoupling of internal 3.3V rail.
CCT1000pF to 0.2FFCapacitor to set charge timer, optional. See the Fault Output (FLT) and Charge Timer (CT) section
for details.
RISET1.875kI to 30kIResistor to set maximum charging current, optional.
RIDN15kI to 240kIResistor to set termination current for charger, optional.
RD+, RD-33ID+/D- serial impedance.
Li-Ion Chargers with Smart Power Selector,
Adapter Type Detection, and USB Enumeration
MAX8895V/MAX8895W/MAX8895X/MAX8895Y
Detailed Description
The MAX8895_ is an integrated 1-cell Li+ charger with
USB enumeration capability. All power switches for
charging and switching the load between battery and
external power are internal. No external MOSFETS are
required.
The MAX8895_ makes it possible to negotiate more
than 100mA of charging current from a USB host or hub
without processor intervention. The MAX8895_ also auto-
matically detects a dedicated charger or USB charger
and set the input current limit accordingly. The battery
charge current can be set up to 1.85A. Input power not
used by the system charges the battery.
USB Interface
An integrated USB peripheral controller provides auto-
enumeration for full-speed (MAX8895Y) and low-speed
(MAX8895V/MAX8895W/MAX8895X) modes.
The USB controller executes the adapter detection
sequence, which consists of detecting the type of
adapter that is externally connected and setting the input
current limit accordingly.
If attached to a USB charger (host or hub) or a USB 2.0
(host or hub), it enumerates as an HID device and nego-
tiates the maximum charging current level (from VBUS_).
The MAX8895V/MAX8895W/MAX8895X operate in low-
speed mode, using an internal 6MHz oscillator, and does
not require an external crystal to be USB compliant. The
MAX8895Y operates in full-speed mode and requires an
external 12MHz crystal.
According to the USB 2.0 specification, a low-speed
device is not allowed to use a standard USB “B” con-
nector. This is why MAX8895_ is available in both a
low- and full-speed version. This makes it possible to
use a custom or captive cable for low-speed mode
using the MAX8895V/MAX8895W/MAX8895X and still be
USB compliant. Operating in full-speed mode, using the
MAX8895Y allows use of a standard USB “B” connector.
D+ and D-
The internal USB full speed (MAX8895Y)/low-speed
(MAX8895V/MAX8895W/MAX8895X) transceiver is
brought out to the bidirectional data pins D+ and D-.
These pins are ESD protected up to Q8kV (HBM).
Connect these pins to a USB “B” custom connector
through external 33I series resistors. The MAX8895V/
MAX8895X provide an automatic switchable 1.5kI pul-
lup resistor for D-, while the MAX8895Y provides an auto-
matic switchable 1.5kI pullup resistor for D+.
Adapter Detection
When an adapter is present on VBUS_, the MAX8895_
examines the external device to identify the type of
adapter connected.
The possible adapter types are:Dedicated chargerUSB charger (host or hub)USB 2.0 (host or hub) low powerUSB 2.0 (host or hub) high power
Each of these different devices has different current
capability as shown in Table 1.
Figure 7. USB Rise and Fall Timing
Figure 8. Load for D+/D- AC Measurements
Table 1. Adapter Types
USB Timing
tRISEtFALL
90%
10%
MAX8895V
MAX8895W
MAX8895X
MAX8895Y
D+ OR D-
CL = 50pF15kI
TEST POINT
3.3Ω
ADAPTER TYPEOUTPUT VOLTAGEOUTPUT CURRENT
Dedicated charger4.75V to 5.25V at ILOAD < 500mA
2.0V to 5.25V for ILOAD R500mA500mA to 1.85A
USB charger4.75V to 5.25V at ILOAD < 500mA
0 to 5.25V for ILOAD R 500mA
500mA to 900mA for low speed, full speed
500mA to 1.5A for low speed and full speed
USB 2.0 low power4.25V to 5.25V100mA (max)
Li-Ion Chargers with Smart Power Selector,
Adapter Type Detection, and USB Enumeration
MAX8895V/MAX8895W/MAX8895X/MAX8895Y
When an adapter is connected to the MAX8895_, a
series of tests is performed to identify the type of device
connected. The sequence is done according to the flow
charts in Figures 7 and 8. Figures 9, 10, and 11 show the
adapter-type detection timing.
DISABLE VDP_SRC
DISABLE VDM_SINK
DISABLE DM_PU
DISABLE I_DM_PD
DISABLE DP_CD_PU
DISABLE VDP_SRC
DISABLE VDM_SINK
ENABLE I_DM_PD
ENABLE DP_CD_PU
DELAY tDP_SRC_HC
DISABLE VDP_SRC
DISABLE VDM_SINK
ILIM = IENU
DELAY tDP_SRC_HC
ENABLE DM_PU
ENABLE VDP_SRC
ENABLE VDM_SINK
DELAY tDP_SRC_ON
DEBOUNCE
tUSB_DB
USB_OK = HIGH
YES
YES
YES
DISABLE VDP_SRC
DISABLE VDM_SINK
DISABLE DM_PU
DISABLE I_DM_PD
DISABLE DP_CD_PU
ILIM = ISUS
STDBY = HIGH
YESILIM = IUSB_LP
ILIM = IDCHG
ILIM = IUSB_CHG
ENU_EN = HIGH
YESVDAT_REF P VDM < VDM_IHNO
DISABLE I_DP_PD
DISABLE
DP_CD_PU
ENABLE DM_PU
ILIM = IUSS_CHG
YESDM > VDM_IHNONO
YES
YES
YES
YES
YES
YES
DISABLE DM_PU
ILIM = ISUS
DELAY tFAULT
ENUMERATION
SUCCEEDED
USB
SUSPEND
SUS_EN = LOW
USB HOST
D- HIGH TO LOW
TRANSITION
USB_OK = LOW
FROM ANY CONDITION
STDBY = HIGH
FROM ANY
CONDITION,
USB_OK = _HIGH
YES
ENUMERATION
SUCCEEDED
DISABLE DP_PU
ILIM = ISUS
DELAY tFAULT
ILIM = USB_LP
OR USB_HP
ILIM = ISUS
DELAY tRWU
INITIATE
RESUME
DELAY tRE_ENUM
YESCHARGE
DONE
RWU
SUPPORTED
BY HOST
RWU = LOW
DISABLE VDP_SRC
DISABLE VDM_SINK
DISABLE DM_PU
DISABLE I_DM_PD
DISABLE DP_CD_PU
DISABLE VDP_SRC
DISABLE VDM_SINK
ENABLE I_DM_PD
ENABLE DP_CD_PU
DELAY tDP_SRC_HC
DISABLE VDP_SRC
DISABLE VDM_SINK
ILIM = IENU
DELAY tDP_SRC_HC
ENABLE DM_PU
ENABLE VDP_SRC
ENABLE VDM_SINK
DELAY tDP_SRC_ON
DEBOUNCE
tUSB_DB
USB_OK = HIGHNO
YES
YES
YES
DISABLE VDP_SRC
DISABLE VDM_SINK
DISABLE DM_PU
DISABLE I_DM_PD
DISABLE DP_CD_PU
ILIM = ISUS
STDBY = HIGH
YES
ILIM = IUSB_LP
ILIM = IDCHG
ILIM = IUSB_CHG
ENU_EN = HIGH
YESVDAT_REF P VDM < VDM_IHNO
DISABLE I_DP_PD
DISABLE
DP_CD_PU
ENABLE DM_PU
ILIM = IUSS_CHG
YESDM > VDM_IHNONO
YES
YES
YES
YES
YES
DISABLE DM_PU
ILIM = ISUS
DELAY tFAULT
ENUMERATION
SUCCEEDED
USB
SUSPEND
SUS_EN = LOW
YES
USB HOST
D- HIGH TO LOW
TRANSITION
USB_OK = LOW
FROM ANY CONDITION
STDBY = HIGH
FROM ANY
CONDITION,
USB_OK = _HIGH
YES
ENUMERATION
SUCCEEDED
DISABLE DP_PU
ILIM = ISUS
DELAY tFAULT
ILIM = USB_LP
OR USB_HP
ILIM = ISUS
DELAY tRWU
INITIATE
RESUME
DELAY tRE_ENUM
YESCHARGE
DONE
RWU = LOW
RWU
SUPPORTED
BY HOST
