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MAX8934GETI+ |MAX8934GETIMAXIMN/a108avaiDual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring
MAX8934GETI+TMAXIXN/a755avaiDual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring


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MAX8934GETI+-MAX8934GETI+T
Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring
Dual-Input Linear Charger, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934G
General Description
The MAX8934G dual-input Li+/Li-Poly linear battery char-
ger with Smart Power SelectorK safely charges a single
Li+/Li-Poly cell in accordance with JEITA* recommenda-
tions. The MAX8934G monitors the battery temperature
(TBATT) while charging, and automatically adjusts the
fast-charge current and charge termination voltage as the
battery temperature varies. The MAX8934G 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. Safety region
2 is supported (see Figure 6 for details). An ultra-low IQ,
always-on LDO provides an additional 3.3V supply for
system power.
The MAX8934G 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 MAX8934G 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. Automatic input
selection switches the system load from battery to external
power.
The MAX8934G 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 MAX8934G 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 SYS Regulation Voltage
Typical Operating Circuit
+Denotes a lead(Pb)-free/RoHS-compliant package.
**EP = Exposed pad.
Ordering Information
*JEITA (Japan Electronics and Information Technology
Industries Association) Standard, A Guide to the Safe Use of
Secondary Lithium Ion Batteries on Notebook–Type Personal
Computers, April 20, 2007.
PARTTEMP RANGEPIN-PACKAGE
MAX8934GETI+-40NC to +85NC28 Thin QFN-EP**
MAX8934G
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 Charger, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934G
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 LimitVDC = 5V, VSYS = 4V,
TA = +25NC
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 = 5V4.294.354.4V
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
Thermal-Limit GainISYS reduction with die temperature (above +100NC)5%/C
Dual-Input Linear Charger, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934G
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
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 Table 2)
DC unconnected,
VUSB = 5V, TA = +25NC
VPEN1 = 0V, VPEN2 = 5V450475500mAVPEN1 = VPEN2 = 0V8095100
SYS Regulation VoltageDC unconnected, VUSB = 6V, VPEN2 = 5V, ISYS = 1mA
to 400mA, VCEN = 5V4.294.354.4V
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
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 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
4.0344.0754.1
Dual-Input Linear Charger, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934G
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 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
BATT Charge Current Accuracy
VSYS = 5.5V,
VTHM_T1 < VTHM
< VTHM_T4 (safety
region 2)
RISET = 2kI135015001650
RISET = 4kI675750825
RISET = 10kI270300330
RISET = 2kI, VBATT = 2.5V
(prequal)270300330
RISET = 4kI, VBATT = 2.5V
(prequal)130150170
RISET = 10kI, VBATT = 2.5V
(prequal)60
ISET Output VoltageRISET = 4kI, IBATT = 500mA (VISET = 1.5V at full
charge current) VTHM_T1 < 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 decreasing20%
Maximum Prequal TimeFrom CEN falling to end of prequal charge, VBATT = 2.5V180min
Maximum Fast-Charge TimeFrom CEN falling to FLT falling300min
Maximum Top-Off Time15s
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%
Dual-Input Linear Charger, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934G
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 100kI Q1% nominal, part number Vishay NTHS0603N01N1003FF, external pullup resistor =
100kI Q1%.
PARAMETERCONDITIONSMINTYPMAXUNITS
THERMISTOR MONITOR (Beta = 3964) (Note 2)
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)VBATT_REG, reduced, 2NC hysteresis
8.21012NC
66.26767.6% of
THMSW
THM Hot Threshold (T3)VBATT_REG reduced, 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 Discharge 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 Charger, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934G
Typical Operating Characteristics
(TA = +25NC, circuit of Figure 2, VDC = 6V, VBATT = 3.6V, thermistor Beta = 3964, unless otherwise noted. Negative battery current
indicates charging.)
USB OPERATING SUPPLY CURRENT
vs. USB VOLTAGE (CHARGER ENABLED)
MAX8934G toc01
USB OPERATIN SUPPLY CURRENT (
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)
MAX8934G toc02
USB VOLTAGE (V)
USB OPERATING SUPPLY CURRENT (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
MAX8934G toc03
USB VOLTAGE (V)
USB QUIESCENT CURRENT (654321
VBATT = 4.2V,
USUS = 1
BATTERY INPUT CURRENT
vs. BATTERY VOLTAGE
(USB DISCONNECTED)
MAX8934G toc04
BATTERY VOLTAGE (V)
BATTERY INPUT CURRENT (uA)321
THMEN = 1
THMEN = 0
CHARGE CURRENT (mA)
CHARGE CURRENT
vs. BATTERY VOLTAGE (500mA USB)
MAX8934G toc07
VUSB = 5V
PEN1 = X, PEN2 = 1
VBATT RISING
VBATT FALLING
CHARGE CURRENT
vs. BATTERY VOLTAGE (1A DC)
MAX8934G toc08
CHARGE CURRENT (mA)321
VDC = 5V
PEN1 = 1, PEN2 = X
VBATT RISING
VBATT FALLING
BATTERY INPUT CURRENT
vs. TEMPERATURE
MAX8934G toc05
TEMPERATURE (°C)
BATTERY INPUT CURRENT (3510-15
VBATT = 4V, THMEN = 0, ILDO = 0
USB AND DC UNCONNECTED
CHARGE CURRENT vs.
BATTERY VOLTAGE (100mA USB)
MAX8934G toc06
BATTERY VOLTAGE (V)
CHARGE CURRENT (mA)321
VUSB = 5V
PEN1 = X, PEN2 = 0
VBATT RISING
VBATT FALLING
Dual-Input Linear Charger, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934G
Typical Operating Characteristics (continued)
(TA = +25NC, circuit of Figure 2, VDC = 6V, VBATT = 3.6V, thermistor Beta = 3964, unless otherwise noted. Negative battery current
indicates charging.)
SYS OUTPUT VOLTAGE
vs. SYS OUTPUT CURRENT (DC)
MAX8934G toc14
SYS VOLTAGE (V)
VDC = 6V
VDC = 5V
VBAT = 4V
PEN1 = 1, PEN2 = X
CEN = 1
BATTERY REGULATION VOLTAGE
vs. TEMPERATURE
MAX8934G toc10
BATTERY VOLTAGE (V)
BATTERY REGULATION VOLTAGE (V)3510-15
SYS OUTPUT VOLTAGE
vs. DC VOLTAGE
MAX8934G toc12
DC VOLTAGE (V)108642014
SYS VOLTAGE (V)
VBATT = 4.0V
NO SYS LOAD
NORMALIZED CHARGE CURRENT
vs. AMBIENT TEMPERATURE
(LOW IC POWER DISSIPATION)
MAX8943G toc09
AMBIENT TEMPERATURE (°C)
NORMALIZED CHARGE CURRENT35-1510
VUSB = 5V, VBATT = 4V
SYS OUTPUT VOLTAGE
vs. USB VOLTAGE
MAX8934G toc11
USB VOLTAGE (V)
SYS VOLTAGE (V)654321
VBATT = 4.0V
NO SYS LOAD
SYS OUTPUT VOLTAGE vs. SYS OUTPUT
CURRENT (USB AND DC DISCONNECTED)
MAX8934G 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 Charger, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934G
Typical Operating Characteristics (continued)
(TA = +25NC, circuit of Figure 2, VDC = 6V, VBATT = 3.6V, thermistor Beta = 3964, unless otherwise noted. Negative battery current
indicates charging.)
VL OUTPUT VOLTAGE vs.
DC VOLTAGE
MAX8934G toc16
DC VOLTAGE (V)
OUTPUT VOLTAGE (V)108642
IVL = 5mA
IVL = 0mA
CHARGE PROFILE—820mAh BATTERY
ADAPTER INPUT—1A CHARGE
TIME (min)
BATTERY CURRENT (mA)4020
MAX8934G toc18
BATTERY VOLTAGE (V)2.5
VBAT
IBAT
DC CONNECT WITH NO USB
(RSYS = 22I)
MAX8934G toc20
3.6V
4.35V3.6V
1.2A
-1A
1A/div
5V/div
5V/div
1A/div
VBATT
VSYS
IDC
IBATT
160mA0mA
BATTERY CHARGER SOFT-START
CSYS CHARGINGCDC
CHARGING
SYS OUTPUT VOLTAGE vs.
SYS OUTPUT CURRENT (USB)
MAX8934G toc15
SYS OUTPUT CURRENT (A)
SYS OUTPUT VOLTAGE (V)
VBATT = 4.0V,
VUSB = 5.0V
CEN = 1
0.1A, PEN1 = 0, PEN2 = 0
0.5A, PEN1 = 0, PEN2 = 0
CHARGE PROFILE—820mAh BATTERY
USB INPUT—500mA CHARGE
MAX8934G toc17
TIME (min)
BATTERY CURRENT (mA)
BATTERY VOLTAGE (V)
IBATVBAT
DC CONNECT WITH USB CONNECTED
(RSYS = 22I)
MAX8934G toc19
4.35V3.8V
475mA
1.2A
-1A
1A/div
5V/div
1A/div
500mA/div
VSYS
IDC
IUSB
IBATT
-303mA
BATTERY CHARGER SOFT-START
CDC CHARGINGCSYS CHARGING
Dual-Input Linear Charger, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934G
Typical Operating Characteristics (continued)
(TA = +25NC, circuit of Figure 2, VDC = 6V, VBATT = 3.6V, thermistor Beta = 3964, unless otherwise noted. Negative battery current
indicates charging.)
USB CONNECT WITH NO DC
(RSYS = 22I)
MAX8934G toc22
3.3V
3.3V
3.3V
-150mA
475mA
3.7V4.3V
-1A
5V/div
5V/div
5V/div
5V/div
500mA/div
500mA/div
VUSB
IUSB
VSYS
VUOK
IBATT
200µs/div
BATTERY CHARGER
SOFT-START
CSYS CHARGING
CDC CHARGING
-307mA
VCHG
USB SUSPEND (RSYS = 22I)
MAX8934G toc24
3.3V5V/div
VUSUS
VSYS
IUSB
200µs/div
3.7V
-307mA
3.6V
3.3VVCHG
IBATT
475mA0A
160mA
VUSB = 5V
5V/div
5V/div
500mA/div
500mA/div
LDO OUTPUT VOLTAGE vs. LDO OUTPUT
CURRENT (USB DISCONNECTED)
MAX8934G toc26
LDO OUTPUT VOLTAGE (V)
VDC = 5.0V
VBATT = 4.0V
DC UNCONNECTED
DC DISCONNECT WITH NO USB
(RSYS = 22I)
MAX8934G toc21
3.6V
3.6V4V
-1A
1A/div
5V/div
5V/div
1A/div
VBATT
VSYS
IDC
IBATT
200µs/div
160mA
-IBATT = CHARGING
1.2A
USB DISCONNECT WITH NO DC
(RSYS = 22I)
MAX8934G toc23
4.2V0V5V/div
VUSB
VSYS
IUSB
200µs/div
0mA
3.7V3.6V
3.3V
3.3V
VUOK
IBATT
VCHG
-307mA
475mA
160mA
5V/div
5V/div
5V/div
500mA/div
500mA/div
USB RESUME (RSYS = 22I)
MAX8934G toc25
5V/divVUSUS
VSYS
IUSB
200µs/div
3.7V3.6V4.3V
3.3VVCHG
IBATT
160mA
475mA
VUSB = 5V
5V/div
5V/div
500mA/div
500mA/div
-307mA
BATTERY CHARGER
SOFT-START
Dual-Input Linear Charger, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934G
Typical Operating Characteristics (continued)
(TA = +25NC, circuit of Figure 2, VDC = 6V, VBATT = 3.6V, thermistor Beta = 3964, unless otherwise noted. Negative battery current
indicates charging.)
LDO STARTUP WAVEFORMS
MAX8934G 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
MAX8934G toc29
FREQUENCY (kHz)
PSRR (dB)1
VSYS = 3.6V
ILDO = 10mA
RESISTIVE LOAD
THM NORMAL TO
THM COLD (< T2) TRANSITION
MAX8934G toc31
1V/div
200mV/div
200mA/div
VTHM
VBAT
IBAT
10I RESISTOR FROM BATT TO GND
4.2V
4.075V
2.2V
420mA
LDO OUTPUT VOLTAGE vs.
BATTERY VOLTAGE
MAX8934G toc28
BATTERY VOLTAGE (V)
LDO
OUTPUT
VOLTAGE (V)
VBATT RISING
VBATT FALLING
LDO NOISE DENSITY
vs. FREQUENCY
MAX8934G toc30
FREQUENCY (kHz)
OUTPUT NOISE (nV
/Hz)
0.0110,000
VBATT = 3.8V,
ILDO = 10mA
RESISTIVE LOAD
Dual-Input Linear Charger, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934G
Typical Operating Characteristics (continued)
(TA = +25NC, circuit of Figure 2, VDC = 6V, VBATT = 3.6V, thermistor Beta = 3964, unless otherwise noted. Negative battery current
indicates charging.)
THM NORMAL TO THM HOT NO
CHARGE (> T4) TRANSITION
MAX8934G 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 T2 TO T1
(COLD, NO CHARGE) TRANSITION
MAX8934G toc35
1V/div
1V/div
200mA/div
VTHM
VBATT
IBATT
10ms/div
10I RESISTOR FROM BATT TO GND
4.2V
0mA
4.075V
2.54V
2.2V
420mA
MAX8934G 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
(> T3) TRANSITION
MAX8934G 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
Dual-Input Linear Charger, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934G
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 7.
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.PEN1Input Limit Control 1. See Table 2 for complete information.PEN2Input Limit Control 2. See Table 2 for complete information.PSETDC Input Current-Limit Setting. Connect a resistor from PSET to GND to program the DC current limit up
to 2A (3000V/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 (3000V/RISET). The prequal charge current is 20% of the set fast-charge charge
current.USUSUSB Suspend Digital Input. As shown in Table 2, driving USUS high suspends the DC or USB inputs if
they are configured as a USB power input.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 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.THMSW
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.
Dual-Input Linear Charger, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934G
Pin Description (continued)
PINNAMEFUNCTIONLDO
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. The USB current limit is set with
PEN2 and USUS. See Table 2. Both USB pins must be connected together externally. Connect a 4.7FF
ceramic capacitor from USB to GND.
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 or 4.35V. When the system load (ISYS)
exceeds the DC or USB current limit, SYS is regulated to 75mV 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 Charger, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934G
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
TIMERMAX8934G
CEN
FLT
DONE
CHG
Dual-Input Linear Charger, Smart Power Selector
with Advanced Battery Temperature Monitoring
MAX8934G
Figure 2. Typical Application Circuit Using Separate DC and USB Connector
DC
CHARGE
DONE
ADAPTER
RPU
1MIRPU
4x 1MI
CDC
10FF
CSYS
10FF
CBATT
4.7FF
CUSB
4.7FF
CLDO
1FF
DC
PEN1
PEN2
PSET
VL
GND
CT
THMSW
THMSW
ACTIVE
DISABLED
THM
THMEN
CEN
DONE
FLT
UOK
DOK
TO LDO
LDO
OVERTEMPERATURE
FAULT OUTPUT
USB PWR OK
DC PWR OK
SYSTEM
LOAD
CHARGE
INDICATOR
1-CELL
Li+
SYS
SYS
CHG
BATT
BATT
USB
USB
LDO
USUSEP1OFF
CHARGE ON
500mA
100mA
9, 13
USB SUSPEND
RPSET
1.5kI
1MI
ISET 11
RISET
3kI
100kINTC
100kI
25C
CVL
0.1FF
CCT
0.068FF
MAX8934G
VBUS
GND
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