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MAX8922LETB+T
30V Li+ Linear Battery Charger with GSM Test Mode in 3mm x 2mm TDFN
General DescriptionThe MAX8922L linear battery charger safely charges a
single-cell lithium-ion (Li+) battery. Charging rate is
optimized to accommodate the thermal characteristics
of a given application. There is no need to reduce the
maximum charge current at the worst-case charger
power dissipation. Charging is optimized for a single
Li+ cell using a control algorithm that includes low-bat-
tery precharging, voltage and current-limited fast
charging, and top-off charging, while continuously
monitoring for input overvoltage and device die-temper-
ature conditions. The fast-charge current and top-off
current thresholds are programmable by a simple
single-pin serial interface. The charger status and valid
input power are indicated by two open-drain outputs
(CHGand POK).
The fast-charge current is defaulted to 400mA and pro-
grammable through the single-pininterface (EN/SET).
The MAX8922L also can be programmable to GSM test
mode through the single-pininterface.
The MAX8922L is available in a tiny (3mm x 2mm x
0.8mm) 10-pin TDFN package.
ApplicationsGSM/EDGE/UMTS/CDMA Cell Phones
Digital Cameras
PDAs
Portable Media Players and MP3 Players
Wireless Appliances
FeaturesOvervoltage-Protected 30VDCRated Input (IN)Input Overvoltage-Protected Safe 4.94V LDO
Output2.3A GSM RF Test ModeNo External FET, Blocking Diode, or Sense
Resistor RequiredSingle-Pin Easy Programmable Fast-Charge and
GSM Test Mode (EN/SET)Resistor-Programmable Fast-Charge Current
(SETI)Resistor-Programmable Top-Off Current
Threshold (MIN)Prequalification ChargePower-OK Monitor Output (POK)Charging-Status Output (CHG)Die Temperature Regulation for Optimized
Charge RateTiny (3mm x 2mm x 0.8mm) 10-Pin TDFN Package
MAX8922L
30V Li+ Linear Battery Charger
with GSM Test Mode in 3mm x 2mm TDFN19-4929; Rev 1; 4/10
Ordering Information
PARTPIN-PACKAGETOP MARKMAX8922LETB+T10 TDFN-EP*AWN
+Denotes a lead(Pb)-free and RoHS-compliant package.
*EP = Exposed pad.
Note:This device operates in the -40°C to +85°C extended
operating temperature range.
USB/AC ADAPTER
4.45V TO 30VINBAT
EN\SET
GND
LDOSETI
MINPOK
CHG
SYSTEM SUPPLY
RSETI
RMIN
TEST
MAX8922L
Typical Operating Circuit*EP
*EP = EXPOSED PAD.
BATCHGTEST
GND
LDO
MAX8922L
POK
SETI
EN/SET
MIN
TDFN
(3mm x 2mm x 0.8mm)TOP VIEW
Pin Configuration
MAX8922L
30V Li+ Linear Battery Charger
with GSM Test Mode in 3mm x 2mm TDFN
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VIN= 5V, VBAT= 4V, VEN/SET= 0V, TA= -40°C to +85°C, typical values are at TA= +25°C, unless otherwise noted.) (Note 1)
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.
IN to GND ..............................................................-0.3V to +30V
BAT, CHG, EN/SET, POK, SETI,
MIN, LDO, TEST to GND......................................-0.3V to +6V
IN to BAT Continuous Current.......................................1ARMS
Continuous Power Dissipation (TA= +70°C)
10-Pin (3mm x 2mm) TDFN
(derate 14.9mW/°C above +70°C)..........................1188.7mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature Range............................-40°C to +150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
Soldering Temperature (reflow).......................................+260°C
PARAMETERCONDITIONSMINTYPMAXUNITSInput Voltage Range028V
Input Voltage Operating Range(Note 2)4.457V
Input Undervoltage Threshold
(UVLO)VIN rising, 500mV hysteresis (typ)3.803.904.00V
Input Overvoltage Threshold
(OVP)VIN rising, 200mV hysteresis (typ)7.27.57.8V
IBAT = 0mA, charge mode7001300
VEN/SET = 5V, standby mode250440Input Supply Current
VIN = VBAT, shutdown mode200
IN-to-BAT On-ResistanceVIN = 4.15V, VBAT = 4V0.35Ω
VIN rising120250500IN-to-BAT Comparator ThresholdVIN falling100mV
BATTA = +25°C4.1794.24.221BAT Regulation VoltageIBAT = 100mATA = -40°C to +85°C4.1584.24.242V
VBAT rising4.67Battery Removal Detection
ThresholdHysteresis0.2V
Default fast-charge current, VBAT = 3.5V365400435
EN/SET = one pulse with low > 4ms, RSETI = 3kΩ,
one-pulse mode, VBAT = 3.5V460500540
EN/SET = two pulses with low > 4ms, VBAT = 3.5V8090100Charging Current
EN/SET = three pulses with low > 4ms,
VBAT = 3.5V (Note 3)2350
Soft-Start TimeRamp time to fast-charge current250µs
BAT Precharge ThresholdVBAT rising, 300mV hysteresis (typ)2.5V
Precharge Current80mA
BAT Leakage CurrentVIN = 0V, VBAT = 4.2V15µA
MAX8922L
30V Li+ Linear Battery Charger
with GSM Test Mode in 3mm x 2mm TDFN
PARAMETERCONDITIONSMINTYPMAXUNITS
LDOMinimum LDO Bypass
Capacitance1µF
LDO Regulated Output VoltageILDO = 10mA, VIN = 5V4.84.94V
LDO Output-Current Limit100mA
EN/SET
Rising1.4Logic Input ThresholdsFalling0.4V
Program Lock Time4ms
Shutdown DelayVIN = 5V, EN/SET from low to high4ms
tLOW(Note 4)1001400
tHIGH(Note 4)1001400µs
Pulldown Resistor2MΩ
POK, CHG
Logic Output Voltage, LowIPOK, = ICHG = 5mA0.050.2V
TA = +25°C0.0011Logic Output Current, HighVPOK = VCHG = 5.5V, VIN = 0VTA = +85°C0.01µA
CHG
Default top-off threshold, hysteresis
(typ) = 80mA6080100
EN/SET = one pulse, RMIN =
1.875kΩ, hysteresis (typ) = 130mA6080100Top-Off Threshold
IBAT falling,
battery is
charged
EN/SET = two pulses, hysteresis
(typ) = 22mA506070
Detection DelayIBAT falls below top-off threshold246ms
THERMAL LOOPThermal-Limit TemperatureJunction temperature when the charge current is
reduced, TJ rising+105°C
Thermal-Limit GainReduction of IBAT for increase of TJ, default mode-28mA/°C
ELECTRICAL CHARACTERISTICS (continued)(VIN= 5V, VBAT= 4V, VEN/SET= 0V, TA= -40°C to +85°C, typical values are at TA= +25°C, unless otherwise noted.) (Note 1)
Note 1:Limits are 100% production tested at TA= +25°C. Limits over the operating temperature range are guaranteed by design
and characterization.
Note 2:Guaranteed by undervoltage- and overvoltage-threshold testing. If VBAT= 4.2V, VINneeds to be > 4.2V + 250mV (typ) to
start normal operation. After the MAX8922L turns on, it can operate until VBAT+ 100mV (typ). For complete charging, the
input voltage must be > 4.45V. See theInput Sourcessection.
Note 3:Used for factory GSM RF calibration. 217Hz, 12.5% current pulse, TA= +25°C. Not for continuous charge current.
Note 4:Not tested. Design guidance only.
CHARGE CURRENT vs.
SUPPLY VOLTAGE
MAX8922 toc04
SUPPLY VOLTAGE (V)
CHARGE CURRENT (mA)2418216912153
400mA DEFAULT
VBAT = 4V
CHARGE CURRENT WITH ONE
EN/SET PULSE
MAX8922 toc05
5V/div
500mA
400mA
100mA/div
VEN/SET
IBAT
1ms/div
CHARGE CURRENT WITH TWO
EN/SET PULSES
MAX8922 toc06
5V/div
400mA
100mA/div
VEN/SET
IBAT
1ms/div
GSM TRANSIENT RESPONSE
MAX8922 toc07
200mv/div
AC-COUPLED
1A/div
VBAT
IBAT
1ms/div
NO BATTERY
CBAT = 68µF
CHARGE CURRENT vs.
INPUT VOLTAGE HEADROOM
MAX8922 toc08
VIN - VBAT (mV)
CHARGE CURRENT (mA)
IFAST-CHARGE = 677mA
MAX8922L
30V Li+ Linear Battery Charger
with GSM Test Mode in 3mm x 2mm TDFN
Typical Operating Characteristics(VIN= 5V, VEN/SET= 0V. VBAT= 4V, MAX8922L Evaluation Kit. TA= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs.
SUPPLY VOLTAGE
MAX8922 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)53421
DISABLED SUPPLY CURRENT vs.
SUPPLY VOLTAGE
MAX8922 toc02
SUPPLY VOLTAGE (V)
STANDBY SUPPLY CURRENT (mA)53421
CHARGE CURRENT vs.
BATTERY VOLTAGE
MAX8922 toc03
BATTERY VOLTAGE (V)
CHARGE CURRENT (mA)321
400mA PRESET
90mA PRESET
500mA SETI MODE
CHARGE CURRENT (mA)
MAX8922 toc10
CHARGE CURRENT vs.
AMBIENT TEMPERATURE3510-15-4085
AMBIENT TEMPERATURE (°C)
400mA PRESET
VIN = 5V
VBAT = 4V
CHARGE CURRENT vs.
AMBIENT TEMPERATURE (1A CHARGE)
MAX8922 toc11
AMBIENT TEMPERATURE (°C)
CHARGE CURRENT (mA)3510-15
RSETI = 1.5kI
VIN = 5V
VBAT = 4V
BAT REGULATION VOLTAGE ACCURACY
vs. AMBIENT TEMPERATURE
MAX8922 toc09
AMBIENT TEMPERATURE (°C)
BAT
REGULATION ACCURACY (%)3510-15
VIN = 5V
NO BATTERY
MAX8922L
30V Li+ Linear Battery Charger
with GSM Test Mode in 3mm x 2mm TDFN
Typical Operating Characteristics (continued)(VIN= 5V, VEN/SET= 0V. VBAT= 4V, MAX8922L Evaluation Kit. TA= +25°C, unless otherwise noted.)
Pin Description
PINNAMEFUNCTION1INDC Input Supply. Connect IN to VIN > 4V and (VIN - VBAT) ≥ 250mV up to a 7V charging source.
Bypass IN to GND with a 1µF or larger ceramic capacitor.SETI
Charge-Current Program and Fast-Charge Current Monitor. Output current from SETI is 1000µA per
ampere of battery-charging current. Set the charging current by connecting a resistor (RSETI in Figure
1) from SETI to GND. IFAST-CHARGE = 1500V/RSETI. Connect to GND if pulse 1 mode (external SETI)
is not used.GNDGround
4LDO4.94V Regulated LDO Output with Input Overvoltage Protection. Bypass LDO to GND with a 1µF or
larger ceramic capacitor. LDO can be used to supply low-voltage-rated USB systems.
5MINTop-Off Current Threshold Programmable Input. IMIN = 150V/RMIN. Connect to GND if pulse 1 mode
(external SETI) is not used.EN/SETActive-Low Enable Input. EN/SET is used for programming fast-charge current and GSM test mode. For
detailed descriptions, see the Charger-Enable and Program Input (EN/SET) section.TESTFactory Test Input. Connect to GND.CHGCharging-Status Output. CHG is internally pulled low when the charger is in prequalification or fast-
charge mode. CHG is high impedance when the charger is in top-off or disabled.POK
Input Power-OK Monitor. POK is an open-drain output that is internally pulled low when VIN is greater
than VUVLO and lower than VOVP and VIN > VBAT + 250mV. POK is high impedance when VIN is less
than VUVLO or greater than VOVP or VIN < VBAT + 100mV.BATBattery Connection. The IC delivers charging current and monitors battery voltage using BAT. Bypass
BAT to GND with a 2.2µF or larger ceramic capacitor. BAT is high impedance when the IC is disabled.EPExposed Pad. Connect to the GND plane for increased thermal dissipation.
MAX8922L
30V Li+ Linear Battery Charger
with GSM Test Mode in 3mm x 2mm TDFNCC/CV
REGULATOR
CHARGE
AND
LOGIC
CONTROLBAT
SETI
POK
CHG
MIN
RSETI
RMIN
4.45V TO 30V
GND
Li+
LDO
EN/SET
LDO
CONTROL
3.9V
7.5V
BAT
Tj(DIE)
+105°C
PRECHARGEBAT
2.5V
FAST-CHARGE
SWITCH
TOP-OFF
SWITCH
TEST
MAX8922
Figure 1. MAX8922L Functional Diagram
Detailed DescriptionThe MAX8922L is designed to charge a single-cell Li+
battery from a DC source voltage between 4.45V and
7V, while VINcan withstand up to 30V. The fast-charge
current and top-off current thresholds are programma-
ble with EN/SET, SETI, and MIN.
Charger-Enable and Program Input
(EN/SET)EN/SET is an active-low logic input that enables the
charger. Drive EN/SET high longer than 4ms to disable
the charger-control circuitry. If EN/SET is left uncon-
nected, an internal 2MΩpulldown resistor enables
400mA fast-charge current by default. The pulse pro-
gramming scheme shown in Table 1 and Figure 3 is
used to program the charge current and GSM test
mode. There are four different fast-charge current
states. Default fast-charge current state is 400mA
mode. More than three pulses are interpreted to 90mA
mode. After programming is locked, the MAX8922L
ignores pulses until the IC is disabled/enabled or input
power is cycled. Each fast-charge state is locked after
a 4ms logic-low is asserted on EN/SET, followed by
programming pulses. However, during default mode, if
EN/SET does not receive any pulses, the charger stays
in default mode unlocked indefinitely.
Debounce TimerTo prevent the MAX8922L from charging the battery
momentarily upon IN power-up with EN/SET held low, a
2ms (typ) debounce timer delays the charging loop
upon power-up. If EN/SET is logic-low or unconnected
(pulled down by an internal pulldown resistor) during IN
power-up, the charger starts charging the battery 2ms
after VUVLO< VIN< VOVPand VBAT+ 250mV < VIN. If
EN/SET is logic-high during IN power-up, the charger
does not charge the battery.
Soft-StartTo prevent input transients, the rate of change of the
charge current is limited when the charger is turned on
or changes its current compliance. It takes approxi-
mately 250µs (typ) (tSOFTSTART) for the charger to go
from 0mA to the maximum fast-charge current.
Thermal-Limit ControlThe MAX8922L features a thermal limit that reduces the
charge current when the die temperature exceeds
+105°C. As the temperature increases above +105°C,
the IC decreases the charge current by 28mA/°C.
Charge-Indicator Output (CHG)CHGis an open-drain output that indicates charger sta-
tus. CHGgoes low during charging in prequalification
or fast-charge mode. The CHGinternal open-drain
MOSFET turns off when the charge current reaches the
top-off threshold. The CHGstatus is latched after the
top-off threshold is reached. The latch can be reset as
follows:Disable and re-enable the MAX8922L.Input power is cycled.Battery-charge current increases greater than the
top-off threshold + hysteresis.
When the MAX8922L is used in conjunction with a
microprocessor, connect a pullup resistor between
CHGand the logic I/O voltage to indicate charge status
to the µP. Alternatively, CHGcan sink 5mA or more for
an LED charge indicator.
MAX8922L
30V Li+ Linear Battery Charger
with GSM Test Mode in 3mm x 2mm TDFN
CHARGE CURRENTDEFAULTNUMBER OF PULSES + > 4ms
LOGIG-LOWFAST-CHARGE CURRENT SETTINGOneSETI, resistor programmable
Two90mA
Three2.3A (GSM test)IBAT (mA)400mA
Four and more90mA
Table 1. Charge-Current Pulse Settings
MAX8922L
Power-OK Indicator (POK)The MAX8922L contains an open-drain POKoutput that
goes low when VINis greater than VUVLOand lower than
VOVPand VINexceeds the battery voltage by 250mV.
Once charging has started, charging is sustained with
inputs as low as 3.5V, as long as the input voltage
remains above the battery voltage by at least 100mV.
POKstatus should be maintained even though the
charger is disabled by EN/SET. When VIN> VOVP, POK
is high impedance.
30V Li+ Linear Battery Charger
with GSM Test Mode in 3mm x 2mm TDFNVBAT < 2.5V
VBAT < 2.2VVBAT > 2.5V
ICHG < ITOP-OFF
STANDBY MODECHARGER = OFF
POK = LOW
CHG = HIGH IMPEDANCE
SHUTDOWNCHARGER = OFF
POK = HIGH IMPEDANCE
CHG = HIGH IMPEDANCE
PREQUALIFICATIONPRECHARGE CURRENT
POK = LOW
CHG = LOW
FAST CHARGE(PULSE PROGRAMMABLE)
100% CHARGER CURRENT
POK = LOW
CHG = LOW
FULL BATTERYVBAT = 4.2V
POK = LOW
CHG = HIGH IMPEDANCE
ASYNCHRONOUS
FROM ANYWHERE
EN/SET = LOW
FULL BATTERY CONTINUES
TO REGULATE VBAT TO 4.2V
CHARGER LOOP DEFAULT IS OFF;
IF EN/SET = LOW UPON POK.
CHARGER LOOP
ACTIVATES AFTER 4ms
POR DEBOUNCE
PULSE 3
MODE DOES NOT HAVE
PRECHARGE STATE
VUVLO < VIN < VOVP AND
VIN > VBAT + 250mV
VIN < VUVLO
OR VIN > VOVP
OR VBAT + 100mV > VIN
POK = (VOVP > VIN > VUVLO)
AND (VIN - VBAT) > 250mV
ICHG > ITOP-OFF + HYSTERESIS
VIN < VUVLO
OR VIN > VOVP
OR VBAT + 100mV > VIN
ASYNCHRONOUS
FROM ANYWHERE
tEN/SET = HIGH > 4ms
Figure 2. Charger State Diagram
