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MAX8934DETI+-MAX8934EETI+
Dual-Input Linear Chargers, Smart Power Selector with Advanced Battery Temperature Monitoring
Dual-Input Linear Chargers, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934A–MAX8934E
EVALUATION KIT AVAILABLE General Description
The MAX8934_ dual-input Li+/Li-Poly linear battery char-
gers with Smart Power SelectorK safely charge a single
Li+/Li-Poly cell in accordance with JEITA recommenda-
tions. The MAX8934_ monitors the battery temperature
(TBATT) while charging, and automatically adjusts the
fast-charge current and charge termination voltage as the
battery temperature varies. The MAX8934_ also monitors
the battery temperature while the battery is discharging,
and provides a warning flag (OT) to the system in the
event that the battery is over temperature. Two safety pro-
files are supported (see Figure 6 for details). An ultra-low
IQ, always-on LDO provides an additional 3.3V supply for
system power.
The MAX8934_ operates with either separate inputs
for USB and AC adapter power*, or from a single input
that accepts both. All power switches for charging and
switching the load between battery and external power
are included on-chip. No external MOSFETs are required.
The MAX8934_ features a Smart Power Selector to make
the best use of limited USB or adapter power. Input cur-
rent limit and battery charge current limit are indepen-
dently set. Input power not used by the system charges
the battery. Charge current limit and DC current limit can
be set up to 1.5A and 2A, respectively, while USB input
current can be set to 100mA or 500mA for the MAX8934A/
MAX8934B/MAX8934C/MAX8934E and up to 1.5A (max)
for the MAX8934D. Automatic input selection switches the
system load from battery to external power.
The MAX8934A provides a SYS output voltage of 5.3V,
while the MAX8934B–MAX8934E provides a SYS output
voltage of 4.35V.
Other features include overvoltage protection (OVP),
open-drain charge status and fault outputs, power-OK
monitors, charge timers, and a battery thermistor moni-
tor. Additionally, on-chip thermal limiting reduces the
battery charge-rate to prevent charger overheating.
The MAX8934_ is available in a 28-pin, 4mm x 4mm,
TQFN package.
Applications
PDAs, Palmtop, and Wireless Handhelds
Portable Media, MP3 Players, and PNDs
Digital Still Cameras and Digital Video Cameras
Handheld Game Systems
Features
S Li+ Charger with Smart Power Selector, No
External MOSFETs Needed
S Monitors Battery Temperature and Adjusts Charge
Current and Termination Voltage Automatically
per JEITA Recommendations
S OT Flags System of a Hot Battery During
Discharge
S Ultra-Low IQ, Always-On 3.3V LDO
S Common or Separate USB and Adapter Inputs
S Automatic Adapter/USB/Battery Switchover
S Load Peaks in Excess of Adapter Rating are
Supported by Battery
S Input OVP to 16V (DC) and 9V (USB)
S 40mI SYS-to-BATT Switch
S Thermal Regulation Prevents Overheating
S 4.35V or 5.3V SYS Regulation Voltage
S 1.5A (max) USB Input Current Limit (MAX8934D)
Typical Operating Circuit
+Denotes a lead(Pb)-free/RoHS-compliant package.
**EP = Exposed pad.
Ordering Information continued and Selector Guide appears
at end of data sheet.
Smart Power Selector is a trademark of Maxim Integrated
Products, Inc.
Ordering Information
PARTTEMP RANGEPIN-PACKAGE
MAX8934AETI+-40NC to +85NC28 Thin QFN-EP**
MAX8934A−
MAX8934E
SYS
LDO
GND
CHARGE
CURRENT
LOAD
CURRENT
BATTBATTERY
SYSTEM
LOAD
ADAPTER
CHARGE
AND
SYS LOAD
SWITCH
USBQ1
USB
3.3V ALWAYS-ON
LINEAR
REGULATOR
Dual-Input Linear Chargers, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934A–MAX8934E
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.
DC, PEN1 to GND .................................................-0.3V to +16V
USB to GND ............................................................-0.3V to +9V
VL to GND ...............................................................-0.3V to +4V
LDO to GND .........-0.3V to the lower of +4V and (VSYS + 0.3V)
THMEN, THMSW to GND .....................-0.3V to +(VLDO + 0.3V)
THM to GND .......................................-0.3V to (VTHMSW + 0.3V)
PSET, ISET, CT to GND ...............................-0.3V to (VL + 0.3V)
BATT, SYS, CEN, CHG, OT, DOK,
UOK, FLT, DONE, USUS, PEN2 to GND .............-0.3V to +6V
EP (Exposed Pad) to GND ...................................-0.3V to +0.3V
DC Continuous Current (total in two pins) ....................2.4ARMS
SYS Continuous Current (total in two pins) ...................2.4ARMS
USB Continuous Current (total in two pins) ..................2.0ARMS
BATT Continuous Current (total in two pins) .................2.4ARMS
LDO Continuous Current .............................................50mARMS
LDO Short-Circuit Duration .........................................Continuous
Continuous Power Dissipation (TA = +70NC)
Single-Layer Board
(derate 20.8mW/NC above +70NC) ......................1666.7mW
Multilayer Board
(derate 28.6mW/NC above +70NC) ......................2285.7mW
Operating Temperature Range ..........................-40NC to +85NC
Junction Temperature ......................................-40NC to +125NC
Storage Temperature .......................................-65NC to +150NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) ......................................+260NC
ELECTRICAL CHARACTERISTICS
(VDC = VPEN1 = VPEN2 = 5V, CEN = USUS = THMEN = GND, VBATT = 4V, VTHM = 1.65V, USB, THMSW, CHG, DONE, OT, DOK,
UOK, FLT are unconnected, CCT = 0.068FF, TA = -40NC to +85NC, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1)
ABSOLUTE MAXIMUM RATINGS
PARAMETERCONDITIONSMINTYPMAXUNITS
DC-to-SYS PREREGULATOR
DC Operating Voltage Range4.16.6V
DC Withstand VoltageVBATT = VSYS = 0V14V
DC Undervoltage ThresholdWhen V DOK goes low, VDC rising, 500mV hysteresis3.954.04.05V
DC Overvoltage ThresholdWhen V DOK goes high, VDC rising, 360mV hysteresis6.86.97.0V
DC Operating Supply CurrentISYS = IBATT = 0mA, V CEN = 0V12mAISYS = IBATT = 0mA, V CEN = 5V0.81.5
DC Suspend CurrentVDC = V CEN = VUSUS = 5V, VPEN1 = 0V195340FA
DC-to-SYS On-ResistanceISYS = 400mA, V CEN = 5V0.20.35I
DC to BATT Dropout VoltageWhen SYS regulation and charging stops, VDC falling,
150mV hysteresis105090mV
DC Current Limit
VDC = 6V, VSYS = 5V,
TA = +25NC
(MAX8934A);
VDC = 5V, VSYS = 4V,
TA = +25NC
(MAX8934B–
MAX8934E)
RPSET = 1.5kI180020002200
RPSET = 3kI90010001100
RPSET = 6.3kI450475500
VPEN1 = 0V, VPEN2 = 5V
(500mA USB mode)450475500
VPEN1 = VPEN2 = 0V
(100mA USB mode)8095100
PSET Resistance Range1.56.3kI
SYS Regulation VoltageVDC = 6V, ISYS = 1mA
to 1.75A, V CEN = 5V
MAX8934A5.25.35.4VMAX8934B–MAX8934E4.294.354.4
Input Current Soft-Start TimeConnecting DC with USB not present1.5ms
Connecting DC with USB present50Fs
Thermal-Limit TemperatureDie temperature at when the charging current and input
current limits are reduced100NC
Dual-Input Linear Chargers, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934A–MAX8934E
ELECTRICAL CHARACTERISTICS (continued)
(VDC = VPEN1 = VPEN2 = 5V, CEN = USUS = THMEN = GND, VBATT = 4V, VTHM = 1.65V, USB, THMSW, CHG, DONE, OT, DOK,
UOK, FLT are unconnected, CCT = 0.068FF, TA = -40NC to +85NC, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
Thermal-Limit GainISYS reduction with die temperature (above +100NC)5%/C
VL VoltageIVL = 0 to 5mA, USB = unconnected33.33.6V
USB-TO-SYS PREREGULATOR
USB Operating Voltage Range 4.16.6V
USB Withstand VoltageVBATT = VSYS = 0V8V
USB Undervoltage ThresholdWhen V UOK goes low, VUSB rising, 500mV hysteresis3.954.04.05V
USB Overvoltage ThresholdWhen V UOK goes high, VUSB rising, 360mV hysteresis6.86.97.0V
USB Operating Supply CurrentISYS = IBATT = 0mA, V CEN = VPEN2 = 0V12mAISYS = IBATT = 0mA, V CEN = 5V, VPEN2 = 0V0.91.5
USB Suspend CurrentDC = unconnected, VUSB = V CEN = VUSUS = 5V190340FA
USB to SYS On-ResistanceDC unconnected, VUSB = V CEN = 5V, ISYS = 400mA0.220.33I
USB-to-BATT Dropout VoltageWhen SYS regulation and charging stops, VUSB falling,
150mV hysteresis105090mV
USB Current Limit
(See Tables 2a and 2b for Input
Source Control)
DC unconnected,
VUSB = 5V, TA = +25NC
MAX8934D only,
RPSET = 2kI135015001650VPEN1 = 0V, VPEN2 = 5V450475500
VPEN1 = VPEN2 = 0V8095100
SYS Regulation Voltage
DC unconnected, VUSB
= 6V, VPEN2 = 5V, ISYS =
1mA to 400mA, VCEN = 5V
MAX8934A5.25.35.4
MAX8934B/MAX8934C/
MAX8934E4.294.354.4
DC unconnected, VUSB
= 6V, VPEN2 = 5V, ISYS =
1mA to 1.2A, VCEN = 5V
MAX8934D4.294.354.4
Input Limiter Soft-Start TimeInput current ramp time50Fs
Thermal-Limit TemperatureDie temperature at when the charging current and input
current limits are reduced100NC
Thermal-Limit GainISYS reduction with die temperature (above +100NC)5%/NC
VL VoltageDC unconnected, VUSB = 5V, IVL = 0 to 5mA33.33.6V
LDO LINEAR REGULATOR
LDO Output Voltage
DC unconnected, VUSB = 5V, ILDO = 0mA3.2343.33.366VDC = 5V, USB unconnected, ILDO = 0mA3.2343.33.366
DC and USB unconnected, VBATT = 4V, ILDO = 0mA3.2343.33.366
LDO Load RegulationILDO = 0 to 30mA0.003%/mA
Dual-Input Linear Chargers, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934A–MAX8934E
ELECTRICAL CHARACTERISTICS (continued)
(VDC = VPEN1 = VPEN2 = 5V, CEN = USUS = THMEN = GND, VBATT = 4V, VTHM = 1.65V, USB, THMSW, CHG, DONE, OT, DOK,
UOK, FLT are unconnected, CCT = 0.068FF, TA = -40NC to +85NC, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
BATTERY CHARGER
BATT-to-SYS On-ResistanceVDC = 0V, VBATT = 4.2V, ISYS = 1A0.040.08I
BATT-to-SYS Reverse
Regulation VoltageVPEN1 = VPEN2 = 0V, ISYS = 200mA5075105mV
BATT Regulation Voltage—Safety
Region 1 (MAX8934A)IBATT = 0mA
TA = +25NC, VTHM_T1 < VTHM <
VTHM_T34.1754.24.225
TA = 0NC to +85NC, VTHM_T1 <
VTHM < VTHM_T34.1584.24.242
TA = +25NC, VTHM_T3 < VTHM <
VTHM_T44.054.0754.1
TA = 0NC to +85NC, VTHM_T3 <
VTHM < VTHM_T44.0344.0754.1
BATT Regulation Voltage—Safety
Region 2IBATT = 0mA
TA = +25NC, VTHM_T2 < VTHM <
VTHM_T34.1754.24.225
TA = 0NC to +85NC, VTHM_T2 <
VTHM < VTHM_T3 4.1584.24.242
TA = +25NC, VTHM_T1 < VTHM <
VTHM_T2 or VTHM_T3 < VTHM <
VTHM_T4
TA = 0NC to +85NC, VTHM_T1 <
VTHM < VTHM_T2 or VTHM_T3 <
VTHM < VTHM_T4
BATT Recharge Threshold—
Safety Region 1 (MAX8934A)
Change in VBATT
from DONE to fast-
charge restart
VTHM_T1 < VTHM < VTHM_T3-145-104-65
VTHM_T3 < VTHM < VTHM_T4-120-80-40
BATT Recharge Threshold—
Safety Region 2
Change in VBATT
from DONE to fast-
charge restart
VTHM_T2 < VTHM < VTHM_T3-145-104-65VTHM_T1 < VTHM < VTHM_T2 or
VTHM_T3 < VTHM < VTHM_T4-120-80-40
BATT Fast-Charge
Current RangeRISET = 10kI to 2kI 0.31.5A
Dual-Input Linear Chargers, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934A–MAX8934E
ELECTRICAL CHARACTERISTICS (continued)
(VDC = VPEN1 = VPEN2 = 5V, CEN = USUS = THMEN = GND, VBATT = 4V, VTHM = 1.65V, USB, THMSW, CHG, DONE, OT, DOK,
UOK, FLT are unconnected, CCT = 0.068FF, TA = -40NC to +85NC, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
BATT Charge Current Accuracy
VSYS = 5.5V,
VTHM_T2 < VTHM
< VTHM_T4 (safety
region 1) or VTHM_T1
< VTHM < VTHM_T4
(safety region 2)
RISET = 2kI135015001650
RISET = 4kI675750825
RISET = 10kI270300330
RISET = 2kI, VBATT = 2.5V
(prequal)130150170
RISET = 4kI, VBATT = 2.5V
(prequal)5075100
RISET = 10kI, VBATT = 2.5V
(prequal)30
VSYS = 5.5V,
VTHM_T1 < VTHM
< VTHM_T2 (safety
region 1)
RISET = 2kI675750825
RISET = 4kI337.5375412.5
RISET = 10kI130150170
RISET = 2kI, VBATT = 2.5V
(prequal)130150170
RISET = 4kI, VBATT = 2.5V
(prequal)5075100
RISET = 10kI, VBATT = 2.5V
(prequal)30
ISET Output VoltageRISET = 4kI, IBATT = 500mA (VISET = 1.5V at full
charge current) VTHM_T2 < VTHM < VTHM_T40.911.1V
Charger Soft-Start TimeCharge-current ramp time1.5ms
BATT Prequal ThresholdVBATT rising, 180mV hysteresis2.933.1V
BATT Input CurrentVBATT = 4.2V,
ILDO = 0
No DC or USB power
connected, THMEN = low,
VCEN = 5V12No DC or USB power
connected, THMEN = high,
V CEN = 5V25
DC or USB power connected,
V CEN = 5V 0.0032
DONE Threshold as a
Percentage of Fast-Charge
Current
IBATT decreasing10%
Dual-Input Linear Chargers, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934A–MAX8934E
ELECTRICAL CHARACTERISTICS (continued)
(VDC = VPEN1 = VPEN2 = 5V, CEN = USUS = THMEN = GND, VBATT = 4V, VTHM = 1.65V, USB, THMSW, CHG, DONE, OT, DOK,
UOK, FLT are unconnected, CCT = 0.068FF, TA = -40NC to +85NC, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
Maximum Prequal TimeFrom CEN falling to end of prequal charge, VBATT = 2.5V30min
Maximum Fast-Charge TimeFrom CEN falling to FLT falling300min
Maximum Top-Off TimeMAX8934A/MAX8934C/MAX8934E15s
MAX8934B/MAX8934D60min
Timer Accuracy-20+20%
Timer Extend ThresholdPercentage of fast-charge current below where the timer
clock operates at half-speed50%
Timer Suspend ThresholdPercentage of fast-charge current below where timer
clock pauses20%
THERMISTOR MONITOR (Beta = 3477) (Note 2)
THM Cold No-Charge Threshold
(T1)ICHG = 0A, when charging is suspended, 2NC hysteresis
-2.20+2.4NC
73.974.475.1% of
THMSW
THM Cold Threshold (T2)ICHG reduced (safety region 1 only), VBATT_REG
reduced (safety region 2 only), 2NC hysteresis1012NC
64.56565.5% of
THMSW
THM Hot Threshold (T3)VBATT_REG reduced (safety region 1), 2.5NC hysteresis
42.84547.5NC
32.132.432.8% of
THMSW
THM Hot No-Charge Threshold
(T4)
ICHG = 0mA, when charging is suspended, 3NC
hysteresis6063.5NC
22.422.723% of
THMSW
THM Hot Overtemperature
Threshold (TOT)OT asserts low, 5NC hysteresis7580NC
15.515.816% of
THMSW
THERMISTOR MONITOR (Beta = 3964) (Note 3)
THM Cold No-Charge Threshold
(T1)ICHG = 0A, when charging is suspended, 2NC hysteresis
-2.10+2.4NC
76.477.277.9% of
THMSW
THM Cold Threshold (T2)ICHG reduced (safety region 1 only), VBATT_REG
reduced (safety region 2), 2NC hysteresis
8.21012NC
66.26767.6% of
THMSW
Dual-Input Linear Chargers, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934A–MAX8934E
ELECTRICAL CHARACTERISTICS (continued)
(VDC = VPEN1 = VPEN2 = 5V, CEN = USUS = THMEN = GND, VBATT = 4V, VTHM = 1.65V, USB, THMSW, CHG, DONE, OT, DOK,
UOK, FLT are unconnected, CCT = 0.068FF, TA = -40NC to +85NC, unless otherwise noted. Typical values are at TA = +25NC.) (Note 1)
Note 1: Limits are 100% production tested at TA = +25NC. Limits over the operating temperature range are guaranteed by design.
Note 2: NC includes external NTC thermistor error. % of THMSW excludes thermistor beta error and external pullup error. NTC
thermistor assumed to be 10kI nominal, part number Vishay NTHS0603N02N1002FF, external pullup resistor = 10kI.
Note 3: NC includes external NTC thermistor error. % of THMSW excludes thermistor beta error and external pullup error. NTC
thermistor assumed to be 100kI Q1% nominal, part number Vishay NTHS0603N01N1003FF, external pullup resistor =
100kI Q1%.
PARAMETERCONDITIONSMINTYPMAXUNITS
THM Hot Threshold (T3)VBATT_REG reduced, safety region 1, 2.5NC hysteresis
42.84547.5NC
29.83030.6% of
THMSW
THM Hot No-Charge Threshold
(T4)
ICHG = 0mA, when charging is suspended, 3NC
hysteresis6063.5NC
19.519.820.1% of
THMSW
THM Hot Overtemperature
Threshold (TOT)OT asserts low, 5NC hysteresis7580NC
12.612.913.1% of
THMSW
THM Input leakageTHM = GND or LDOTA = +25NC-1+0.001+1FATA = +85NC0.01
THMSW Output LeakageTHMSW = GNDTA = +25NC-0.2+0.001+1FATA = +85NC0.01
THMSW Output Voltage HighSourcing 1mAVLDO -
0.05V
LOGIC I/O: PEN1, PEN2, CHG, FLT, DONE, DOK, UOK, USUS, THMEN)
Logic-Input Thresholds
High level1.3VLow level0.4
Hysteresis50mV
Logic-Input Leakage CurrentVIN = 0 to 5.5VTA = +25NC0.0011FATA = +85NC0.01
Logic-Low Output VoltageSinking 1mA25100mV
Logic-High Output Leakage
CurrentVOUT = 5.5VTA = +25NC0.0011FATA = +85NC0.01
Dual-Input Linear Chargers, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934A–MAX8934E
Typical Operating Characteristics
(MAX8934A, TA = +25NC, circuit of Figure 2, VDC = 6V, VBATT = 3.6V, thermistor Beta = 3964, unless otherwise noted. Negative bat-
tery current indicates charging.)
USB OPERATING SUPPLY CURRENT
vs. USB VOLTAGE (CHARGER ENABLED)
MAX8934A/B/C toc01
USB OPERATIN SUPPLY CURRENT (uA)200
USB VOLTAGE (V)64523108
VBATT = 4.2V,
VUSUS = 0V
CHARGER IN
DONE MODE
ISYS = 0A
VUSB RISING
VUSB FALLING
ENTERING OVLO
USB OPERATING SUPPLY CURRENT
vs. USB VOLTAGE (CHARGER DISABLED)
MAX8934A toc02
USB VOLTAGE (V)
USB OPERATING SUPPLY CURRENT (uA)645231
VBATT = 4.2V,
VUSUS = 0V
CEN = 1
ISYS = 0A
PEN1 = X, PEN2 = 1
VUSB RISING
VUSB FALLING
ENTERING OVLO
USB SUSPEND CURRENT
vs. USB VOLTAGE
MAX8934A/B/C toc03
USB VOLTAGE (V)
USB QUIESCENT CURRENT (654321
VBATT = 4.2V,
USUS = 1
BATTERY INPUT CURRENT
vs. BATTERY VOLTAGE
(USB DISCONNECTED)
MAX8934A toc04
BATTERY VOLTAGE (V)
BATTERY INPUT CURRENT (uA)321
THMEN = 1
THMEN = 0
CHARGE CURRENT vs.
BATTERY VOLTAGE (500mA USB)
MAX8934A/B/C toc07
CHARGE CURRENT (mA)321
VUSB = 5V
PEN1 = X, PEN2 = 1
VBATT RISING
VBATT FALLING
CHARGE CURRENT vs.
BATTERY VOLTAGE (1A DC)
MAX8934A/B/C toc08
CHARGE CURRENT (mA)321
VDC = 5V
PEN1 = 1, PEN2 = X
VBATT RISING
VBATT FALLING
BATTERY INPUT CURRENT
vs. TEMPERATURE
MAX8934A toc05
TEMPERATURE (°C)
BATTERY INPUT CURRENT (uA)3510-15
VBATT = 4V, THMEN = 0, ILDO = 0
USB AND DC UNCONNECTED
CHARGE CURRENT vs.
BATTERY VOLTAGE (100mA USB)
MAX8934A/B/C toc06
BATTERY VOLTAGE (V)
CHARGE CURRENT (mA)321
VUSB = 5V
PEN1 = X, PEN2 = 0
VBATT RISING
VBATT FALLING
Dual-Input Linear Chargers, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934A–MAX8934E
Typical Operating Characteristics (continued)
(MAX8934A, TA = +25NC, circuit of Figure 2, VDC = 6V, VBATT = 3.6V, thermistor Beta = 3964, unless otherwise noted. Negative bat-
tery current indicates charging.)
BATTERY REGULATION VOLTAGE
vs. TEMPERATURE
MAX8934A toc10
BATTERY VOLTAGE (V)
BATTERY REGULATION VOLTAGE (V)3510-15
SYS OUTPUT VOLTAGE
vs. DC VOLTAGE
MAX8934A/B/C toc12
DC VOLTAGE (V)
SYS
OUTPUT
VOLTAGE (V)108642
VBATT = 4.0V
NO SYS LOAD
MAX8934A
MAX8934B–
MAX8934E
SYS OUTPUT VOLTAGE
vs. SYS OUTPUT CURRENT (DC)
MAX8934A/B/C toc14
SYS OUTPUT VOLTAGE (V)
VDC = 6V
VBATT = 4V,
PEN1 = 1, PEN2 = X
CEN = 1
MAX8934A
MAX8934B–
MAX8934E
VDC = 6V
VDC = 5V
VDC = 5V
NORMALIZED CHARGE CURRENT
vs. AMBIENT TEMPERATURE
(LOW IC POWER DISSIPATION)
MAX1960 toc09
AMBIENT TEMPERATURE (°C)
NORMALIZED CHARGE CURRENT35-1510
VUSB = 5V, VBATT = 4V
SYS OUTPUT VOLTAGE
vs. USB VOLTAGE
MAX8934A/B/C toc11
USB VOLTAGE (V)
SYS OUTPUT VOLTAGE (V)654321
VBATT = 4.0V
NO SYS LOAD
MAX8934A
MAX8934B–
MAX8934E
SYS OUTPUT VOLTAGE vs. SYS OUTPUT
CURRENT (USB AND DC DISCONNECTED)
MAX8934A/B/C toc13
SYS OUTPUT VOLTAGE (V)
VBATT = 4.0V
THE SLOPE OF THIS LINE
SHOWS THAT THE BATT-TO-SYS
RESISTANCE IS 40mI.
Dual-Input Linear Chargers, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934A–MAX8934E
Typical Operating Characteristics (continued)
(MAX8934A, TA = +25NC, circuit of Figure 2, VDC = 6V, VBATT = 3.6V, thermistor Beta = 3964, unless otherwise noted. Negative bat-
tery current indicates charging.)
SYS OUTPUT VOLTAGE vs.
SYS OUTPUT CURRENT (USB)
MAX8934A/B/C toc15b
SYS OUTPUT CURRENT (A)
SYS
OUTPUT
VOLTAGE (V)
VBATT = 4.0V,
VUSB = 5.0V
CEN = 1
0.14A, MAX8934B/MAX8934C/
MAX8934D PEN1 = 0, PEN2 = 0
0.5A, MAX8934B/MAX8934C/
MAX8934D PEN1 = 0, PEN2 = 0
1.5A, MAX8934D
PEN1 = 1, PEN2 = 1
CHARGE PROFILE—820mAh BATTERY
USB INPUT—500mA CHARGE
MAX8934A toc17
TIME (min)
BATTERY CURRENT (mA)
VBATTIBATT
BATTERY VOLTAGE (V)
DC CONNECT WITH USB
CONNECTED (RSYS = 22I)
MAX8934A/B/C toc19
500mA/div
5V/div
1A/div
1A/div
IBATT
IUSB
IDC
VSYS
4.2V5.3V
475mA
-190mA
CDC CHARGINGCSYS CHARGING
-1A
1.24A
BATTERY CHARGER SOFT-START
SYS OUTPUT VOLTAGE vs.
SYS OUTPUT CURRENT (USB)
MAX8934A/B/C toc15a
SYS OUTPUT CURRENT (A)
SYS
OUTPUT
VOLTAGE (V)
VBATT = 4.0V,
VUSB = 5.0V
CEN = 1
0.5A, MAX8934A,
PEN1 = 0, PEN2 = 1
0.1A, MAX8934A, PEN1 = 0, PEN2 = 0
VL OUTPUT VOLTAGE vs.
DC VOLTAGE
MAX8934A/B/C toc16
DC VOLTAGE (V)
OUTPUT
VOLTAGE (V)108642
IVL = 5mA
IVL = 0mA
CHARGE PROFILE—820mAh BATTERY
ADAPTER INPUT—1A CHARGE
MAX8934A toc18
BATTERY CURRENT (mA)
IBATT
VBATT
BATTERY VOLTAGE (V)
1.5
Dual-Input Linear Chargers, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934A–MAX8934E
Typical Operating Characteristics (continued)
(MAX8934A, TA = +25NC, circuit of Figure 2, VDC = 6V, VBATT = 3.6V, thermistor Beta = 3964, unless otherwise noted. Negative bat-
tery current indicates charging.)
DC DISCONNECT WITH NO
USB (RSYS = 22I)
MAX8934A/B/C toc21
400Fs/div
3.6V
3.5V
160mA
-820mA
-IBATT = CHARGING
5V/div
1A/div
1A/div
5V/div
IBATT
IDC
VSYS
VBATT
USB DISCONNECT WITH NO
DC (RSYS = 22I)
MAX8934A/B/C toc23
200Fs/div
-260mA
3.9V
3.3V
3.3V
0mA
+160mA
3.6V
475mA
500mA/div
5V/div
5V/div
5V/div
500mA/div
5V/div
IBATT
IUSB
VUSB
VCHG
VUOK
VSYS
USB RESUME (RSYS = 22I)
MAX8934A/B/C toc25
200Fs/div
4.6V4.2V
475mA
3.3V
3.3V
500mA/div
5V/div
5V/div
500mA/div
5V/div
IBATT
IUSB
VUSUS
VCHG
VSYS
BATTERY
CHARGER SOFT-STARTVUSB = 5V
DC CONNECT WITH NO
USB (RSYS = 22I)
MAX8934A/B/C toc20
400Fs/div
3.6V3.5V
160mA
0mA
1.2A
-1A
CDC CHARGING
5V/div
1A/div
1A/div
5V/div
IBATT
IDC
VSYS
VBATT
BATTERY CHARGER
SOFT-START
USB CONNECT WITH NO
DC (RSYS = 22I)
MAX8934A/B/C toc22
200Fs/div
CSYS CHARGING
CUSB CHARGING
475mA
4.2V
-260mA+160mA
3.3V
3.3V
3.6V
500mA/div
5V/div
5V/div
5V/div
500mA/div
5V/div
IBATT
IUSB
VUSB
VCHG
VUOK
VSYS
BATTERY
CHARGER SOFT-START
USB SUSPEND (RSYS = 22I)
MAX8934A/B/C toc24
200Fs/div
VUSB = 5V
3.2V
3.3V3.3V
475mA
4.2V
500mA/div
5V/div
5V/div
500mA/div
5V/div
IBATT
IUSB
VUSUS
VCHG
VSYS
Dual-Input Linear Chargers, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934A–MAX8934E
Typical Operating Characteristics (continued)
(MAX8934A, TA = +25NC, circuit of Figure 2, VDC = 6V, VBATT = 3.6V, thermistor Beta = 3964, unless otherwise noted. Negative bat-
tery current indicates charging.)
LDO OUTPUT VOLTAGE vs. LDO OUTPUT
CURRENT (USB DISCONNECTED)
MAX8934A/B/C toc26
LDO OUTPUT CURRENT (mA)
LDO OUTPUT VOLTAGE (V)
VDC = 5.0V
VBATT = 4.0V
DC UNCONNECTED
LDO OUTPUT VOLTAGE vs.
BATTERY VOLTAGE
MAX8934A/B/C toc28
BATTERY VOLTAGE (V)
LDO
OUTPUT
VOLTAGE (V)
VBATT RISING
VBATT FALLING
LDO NOISE DENSITY
vs. FREQUENCY
MAX8934A toc30
OUTPUT NOISE (nV
/Hz)
0.0110,000
VBATT = 3.8V,
ILDO = 10mA
RESISTIVE LOAD
LDO STARTUP WAVEFORMS
MAX8934A/B/C toc27
2V/div
50mA/div
2V/div
IBATT
VLDO
VBATT
400Fs/div
3.6VILDO = 0
3.3V
ALWAYS-ON LDO POWER-SUPPLY
REJECTION RATIO vs. FREQUENCY
MAX8934A toc29
FREQUENCY (kHz)
PSRR (dB)1
VSYS = 3.6V
ILDO = 10mA
RESISTIVE LOAD
THM NORMAL TO THM COLD
(< T2) TRANSITION
MAX8934A/B/C toc31
2V/div
500mV/div
500mA/divIBATT
VBATT
VTHM
2.2V3.6V
500mA
Dual-Input Linear Chargers, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934A–MAX8934E
Typical Operating Characteristics (continued)
(MAX8934A, TA = +25NC, circuit of Figure 2, VDC = 6V, VBATT = 3.6V, thermistor Beta = 3964, unless otherwise noted. Negative bat-
tery current indicates charging.)
THM NORMAL TO THM HOT
(> T3) TRANSITION
MAX8934A/B/C toc32
500mV/div
200mV/div
500mA/divIBATT
VBATT
VTHM
10ms/div
1.0V
4.2V
HP6060B ELECTRONIC LOAD
SET TO CC MODE
4.075V
940mA
MAX8934A toc34
2V/div
2V/div
2V/div
2V/div
VTHM
VBATT
VSYS
4ms/div
THM NORMAL TO THM HOT
THRESHOLD DISCHARGE TOT
VOT3V
3.6V
3.6V
0.425V
THM NORMAL TO THM HOT NO
CHARGE (> T4) TRANSITION
MAX8934A/B/C toc33
500mV/div
2V/div
100mA/div
IBATT
VBATT
VTHM
20ms/div
0.65V
4.2V
0mA
100mA
4.075V
HP6060B ELECTRONIC
LOAD SET TO CC MODE
THM NORMAL TO THM COLD NO
CHARGE (< T1) TRANSITION
MAX8934A/B/C toc35
500mV/div
2V/div
500mA/div
IBATT
VBATT
VTHM
10ms/div
2.2V
2.54V
3.6V
500mA
0mA
Dual-Input Linear Chargers, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934A–MAX8934E
Pin Description
PINNAMEFUNCTIONDONECharge Complete Output. The DONE active-low, open-drain output pulls low when the charger enters
the DONE state. The charger current = 0mA when DONE is low. See Figure 8.
2, 3DC
DC Power Input. DC is capable of delivering up to 2A to SYS. DC supports both AC adapter and USB
inputs. The DC current limit is set with PEN1, PEN2, and RPSET. See Table 2. Both DC pins must be
connected together externally. Connect a 10FF ceramic capacitor from DC to GND. The DC inputs should
be grounded if not used.CEN
Active-Low Charger Enable Input. Connect CEN to GND or drive low with a logic signal to enable
battery charging when a valid source is connected at DC or USB. Drive high with a logic signal to
disable battery charging.PEN1
Input Limit Control 1. See Table 2a for complete information (MAX8934A/MAX8934B/MAX8934C/
MAX8934E).
Input Limit Control 1. See Table 2b for complete information (MAX8934D).PEN2
Input Limit Control 2. See Table 2a for complete information (MAX8934A/MAX8934B/MAX8934C/
MAX8934E).
Input Limit Control 2. See Table 2b for complete information (MAX8934D).PSETDC Input Current-Limit Setting. Connect a resistor from PSET to GND to program the DC current limit up
to 2A (3000/RPSET).VL
Internal Logic LDO Output Bypass Pin. Provides 3.3V when DC or USB is present. Connect a 0.1FF
ceramic capacitor from VL to GND. VL powers the internal circuitry and provides up to 5mA to an
external load.
9, 13GNDGround. Both GND pins must be connected together externally.CTCharge Timer Program Input. A capacitor from CT to GND sets the maximum prequal and fast-charge
timers. Connect CT to GND to disable the timer.ISET
Charge Current-Limit Setting. A resistor (RISET) from ISET to GND programs the fast-charge charge
current up to 1.5A (3000/RISET). The prequal charge current is 10% of the set fast-charge charge
current.USUS
USB Suspend Digital Input. As shown in Table 2a, driving USUS high suspends the DC or USB inputs if
they are configured as a USB power input (MAX8934A/MAX8934B/MAX8934C/MAX8934E).
USB Suspend Digital Input. As shown in Table 2b, driving USUS high suspends the DC or USB inputs if
they are configured as a USB power input (MAX8934D).THM
Thermistor Input. Connect a negative temperature coefficient (NTC) thermistor with good thermal
contact with the battery from THM to GND. Use a thermistor with Beta = 3964. Connect a resistor
of equal resistance to the thermistor resistance at +25°C from THM to THMSW so that the battery
temperature can be monitored, and the fast-charge current and/or the charge termination voltage is
automatically adjusted, in accordance with safety region 1 or safety region 2 of the JEITA specification.THMEN
Thermistor Enable Input. THMEN controls THMSW by connecting the external thermistor pullup resistor
and the thermistor monitoring circuit to LDO. Drive THMEN high to enable the thermistor circuit in
discharge mode and to connect the external thermistor pullup resistor. Drive THMEN low to disconnect
the external thermistor pullup resistor and to disable the thermistor monitoring circuit to conserve
battery energy when not charging.
Dual-Input Linear Chargers, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934A–MAX8934E
Pin Description (continued)
PINNAMEFUNCTIONTHMSW
Thermistor Pullup Supply Switch. Drive THMEN high to enable the THMSW, shorting the THMSW output
to LDO. Drive THMEN low to open the THMSW switch. THMSW is always on when a valid input source
is present and the battery is being charged. When no input source is present, THMSW is controlled by
THMEN. THMSW is also active when the battery is being discharged, so that the battery temperature
can be monitored for an overtemperature condition.LDO
Always-On Linear Regulator Output. LDO is the output of an internal always-on 3.3V LDO that provides
power to external circuitry. The LDO output provides up to 30mA of current for indicator LEDs or other
loads. LDO remains active even when only a battery is present, so that the thermistor monitor circuitry
can be activated when the battery is being discharged, and other circuitry can remain powered.
Connect a 1FF ceramic capacitor from LDO to GND.
18, 19USB
USB Power Input. USB is capable of delivering up to 0.5A to SYS in the MAX8934A/MAX8934B/
MAX8934C/MAX8934E. The USB current limit is set with PEN2 and USUS. See Table 2a. In the
MAX8934D, USB is capable of delivering up to 1.5A to SYS. Both USB pins must be connected together
externally. Connect a 4.7FF ceramic capacitor from USB to GND. The USB input should be grounded if
it is not used.
20, 21BATT
Battery Connection. Connect the positive terminal of a single-cell Li+ battery to BATT. The battery
charges from SYS when a valid source is present at DC or USB. BATT powers SYS when neither DC nor
USB power is present, or when the SYS load exceeds the input current limit. Both BATT pins must be
connected together externally.CHGCharger Status Output. The CHG active-low, open-drain output pulls low when the battery is in fast
charge or prequal. Otherwise, CHG is high impedance.
23, 24SYS
System Supply Output. SYS is connected to BATT through an internal 40mI system load switch when
DC or USB are invalid, or when the SYS load is greater than the input current limit.
When a valid voltage is present at DC or USB, SYS is limited to 5.3V (MAX8934A) or 4.35V (MAX8934B/
MAX8934C/MAX8934D/MAX8934E). When the system load (ISYS) exceeds the DC or USB current limit,
SYS is regulated to 68mV below VBATT and both the input and the battery service the SYS load.
Bypass SYS to GND with a 10FF ceramic capacitor. Both SYS pins must be connected together
externally.OTBattery Overtemperature Flag. The OT active-low, open-drain output pulls low when THMEN is high and
the battery temperature is R +75NC.DOKDC Power-OK Output. The DOK active-low, open-drain output pulls low when a valid input is detected
at DC.UOKUSB Power-OK Output. The UOK active-low, open-drain output pulls low when a valid input is detected
at USB.FLTFault Output. The FLT active-low, open-drain output pulls low when the battery timer expires before
prequal or fast charge complete.EPExposed Pad. Connect the exposed pad to GND. Connecting the exposed pad does not remove the
requirement for proper ground connections to the appropriate pins.
Dual-Input Linear Chargers, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934A–MAX8934E
Figure 1. Block Diagram
SET INPUT
LIMIT
VL LDO FOR
IC POWER
CURRENT-
LIMITED VOLTAGE
REGULATOR
THERMISTOR
MONITOR
(SEE FIGURE 5)
CHARGE
TERMINATION
AND MONITOR
PWR OK
DOK
USB
UOK
PEN1
PEN2
USUS
PSET
GNDEP
DC POWER MANAGEMENT
Li+ BATTERY CHARGER
AND SYS LOAD SWITCH
SYS
SYS
LDOOT
ISET
BATT
BATT
THM
THMSW
THMEN
CHG
SET INPUT
LIMIT
CURRENT-
LIMITED VOLTAGE
REGULATOR
INPUT AND
CHARGER
CURRENT-LIMIT
LOGIC CONTROL
CHARGER
CURRENT AND
VOLTAGE
CONTROL
THERMAL
REGULATION
PWR OK
USB POWER MANAGEMENT
3.3V ALWAYS-ON
LOW-IQ LDO
CHARGE
TIMER
MAX8934A–
MAX8934E
CEN
FLT
DONE
CHG
