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MAX1507ETA+
Linear Li+ Battery Charger with Integrated Pass FET and Thermal Regulation in 3mm x 3mm Thin DFN
General DescriptionThe MAX1507 is an intelligent, stand-alone constant-cur-
rent, constant-voltage (CCCV), thermally regulated linear
charger for a single-cell lithium-ion (Li+) battery. The
MAX1507 integrates the current-sense circuit, MOS pass
element, and thermal-regulation circuitry, and also elimi-
nates the reverse-blocking Schottky diode to create the
simplest and smallest charging solution for hand-held
equipment.
The MAX1507 functions as a stand-alone charger to
control the charging sequence from the prequalification
state through fast-charge, top-off charge, and full-
charge indication.
Proprietary thermal-regulation circuitry limits the die
temperature when fast charging or while exposed to
high ambient temperatures, allowing maximum charg-
ing current without damaging the IC.
The MAX1507 achieves high flexibility by providing an
adjustable fast-charge current and thermal regulation
setpoints. Other features include the charging status
(CHG) of the battery and an active-low control input (EN).
The MAX1507 accepts a +4.25V to +13V supply, but dis-
ables charging when the input voltage exceeds +7V to
protect against unqualified or faulty AC adapters. The
MAX1507 operates over the extended temperature
range (-40°C to +85°C) and is available in a compact
8-pin thermally enhanced 3mm x 3mm Thin DFN pack-
age with 0.8mm height.
Applications Cellular and Cordless Phones
PDAs
Digital Cameras and MP3 Players
USB Appliances
Charging Cradles and Docks
Bluetooth™ Equipment
FeaturesStand-Alone Linear 1-Cell Li+ Battery ChargerNo External FET, Reverse-Blocking Diode, or
Current-Sense Resistor RequiredProgrammable Fast-Charge Current (0.8A max)Proprietary Programmable Die-Temperature
Regulation Control (+90°C, +100°C, and +130°C)+4.25V to +13V Input Voltage Range with Input
Overvoltage Protection (OVP) Above +7VCharge-Current Monitor for Fuel GaugingLow Dropout Voltage—130mV at 0.425AInput Power-Source Detection Output (VL) and
Charge-Enable Input (EN)Soft-Start Limits Inrush CurrentCharge Status Output (CHG) for LED or
Microprocessor InterfaceSmall 3mm x 3mm 8-Pin Thin DFN Package,
0.8mm High
MAX1507
Linear Li+ Battery Charger with Integrated Pass FET
and Thermal Regulation in 3mm x 3mm Thin DFNTEMP
ISET2
CHGBATT
GND
3mm x 3mm THIN DFNTOP VIEW4
MAX1507765
Pin Configuration
Ordering InformationMAX1507
1μF
INPUT
4.25V TO 13V
2.80kΩ
CHG
1μFLi+
4.2V
BATT
ISET
TEMP
GND
0.47μF
OFF
PARTTEMP RANGEPIN-PACKAGETOP
MARKMAX1507ETA-T-40°C to +85°C8 Thin DFN-EP*AGW
MAX1507ETA+T-40°C to +85°C8 Thin DFN-EP*AGW
Typical Operating Circuit19-2899; Rev 2; 8/05
EVALUATION KITAVAILABLEBluetooth is a trademark of Ericsson.
*EP = Exposed paddle.
+ Denotes lead-free package.
MAX1507
Linear Li+ Battery Charger with Integrated Pass FET
and Thermal Regulation in 3mm x 3mm Thin DFN
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VIN= 5V, VBATT= 4.0V, TEMP = EN= CHG= unconnected, RISET= 2.8kΩto GND, CVL= 0.47µF, BATT bypassed to GND with 1µF,
TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)(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, CHGto GND.....................................................-0.3V to +14V
VL, BATT, ISET, EN, TEMP to GND..........................-0.3V to +6V
VL to IN...................................................................-14V to +0.3V
IN to BATT Continuous Current.............................................0.9A
Continuous Power Dissipation (TA= +70°C)
8-Pin TDFN (derate 24.4mW/°C above+70°C)..........1951mW
Short-Circuit Duration.................................................Continuous
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERCONDITIONSMINTYPMAXUNITSInput Voltage Range013V
Input Operating Range4.256.50V
VIN - VBATT, VIN rising204060ACOK Trip Point, INVIN - VBATT, VIN falling153045mV
VIN rising6.577.5Overvoltage Lockout Trip PointVIN hysteresis0.11V
Charging (IIN - IBATT)12
Disabled, EN = VL0.81.5IN Input Current
OFF state (VIN = VBATT = 4.0V)0.065
VL Output VoltageIVL = 100µA3.3V
VL Load RegulationIVL = 100µA to 2mA-71-200mV
VL Temperature CoefficientIVL = 100µA-2mV/°C
VIN rising2.95VL Undervoltage Lockout Trip PointHysteresis0.17V
VIN = 0 to 4V310BATT Input CurrentEN = VL410µA
Maximum RMS Charge Current0.8A
TA = 0°C to +85°C4.1624.24.238Battery Regulation VoltageIBATT = 0TA = -40°C to +85°C4.1504.24.250V
BATT Removal Detection ThresholdVBATT rising4.44.674.9V
MAX1507
Linear Li+Battery Charger with Integrated Pass FET
and Thermal Regulation in 3mm x 3mm Thin DFN
Note 1:Limits are 100% production tested at TA= +25°C. Limits over operating temperature range areguaranteed through correlation
using statistical quality control (SQC) methods.
ELECTRICAL CHARACTERISTICS (continued)(VIN= 5V, VBATT= 4.0V, TEMP = EN= CHG= unconnected, RISET= 2.8kΩto GND, CVL= 0.47µF, BATT bypassed to GND with 1µF,
TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)(Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITSBATT Removal Detection-Threshold Hysteresis200mV
Minimum BATT Bypass Capacitance1µF/A
Fast-Charge Current-Loop System AccuracyVBATT = 3.5V478520562mA
Precharge Current System AccuracyPercentage of the fast-charge current,
VBATT = 2.2V51015%
TEMP = VL130
TEMP = floating100Die-Temperature-Regulation Set Point
TEMP = GND90
VBATT Precharge Threshold VoltageVBATT rising2.32.52.7V
Current-Sense Amplifier Gain, ISET to IBATT
in Fast Charge ModeIBATT = 500mA, VISET = 1.4V0.8800.9581.035mA/A
Regulator Dropout Voltage (VIN - VBATT )VBATT = 4.1V, IBATT = 425mA130200mV
EN Logic Input Low Voltage4.25V < VIN < 6.5V0.52V
EN Logic Input High Voltage4.25V < VIN < 6.5V1.3V
EN Internal Pulldown Resistor100200400kΩ
CHG Output Low CurrentV CHG = 1V51220mA
TA = +25°C1CHG Output High Leakage CurrentV CHG = 13VTA = +85°C0.002µA
Full Battery Detection Current Threshold
(as a Percentage of the Fast-Charge Current)IBATT falling51015%
MAX1507
Linear Li+ Battery Charger with Integrated Pass FET
and Thermal Regulation in 3mm x 3mm Thin DFN
Typical Operating Characteristics(VIN= 5V, VBATT= 4.0V, TEMP = EN= CHG= unconnected, RISET= 2.8kΩto GND, CIN= 1µF, CBATT= 1µF, CVL= 0.47µF, TA=
+25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX1507 toc01
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)68241012
IBATT = 0
DISABLED-MODE SUPPLY
CURRENT vs. INPUT VOLTAGE
MAX1507 toc02
INPUT VOLTAGE (V)
DISABLED-MODE SUPPLY CURRENT (mA)
EN = VL8421012
CHARGE CURRENT
vs. BATTERY VOLTAGE
MAX1507 toc03
BATTERY VOLTAGE (V)
CHARGE CURRENT (mA)
TEMP = VL
CHARGE CURRENT
vs. INPUT VOLTAGE
MAX1507 toc04
INPUT VOLTAGE (V)
CHARGE CURRENT (mA)
TEMP = VL
CHARGE CURRENT
vs. INPUT-VOLTAGE HEADROOM
MAX1507 toc05
VIN - VBATT (V)
CHARGE CURRENT (mA)
VBATT = 4.0V
BATTERY REGULATION VOLTAGE
vs. TEMPERATURE
MAX1507 toc06
TEMPERATURE (°C)
BATTERY REGULATION VOLTAGE (V)
CHARGE CURRENT
vs. AMBIENT TEMPERATURE
MAX1507 toc07
AMBIENT TEMPERATURE (°C)
CHARGE CURRENT (mA)
TEMP = VL
CHARGE CURRENT
vs. AMBIENT TEMPERATURE (TEMP = VL)
MAX1507 toc08
AMBIENT TEMPERATURE (°C)
CHARGE CURRENT (mA)
VBATT = 4.0V
VBATT = 3.6V
RISET = 1.87kΩ
MAX1507
Linear Li+ Battery Charger with Integrated Pass FET
and Thermal Regulation in 3mm x 3mm Thin DFNypical Operating Characteristics (continued)(VIN= 5V, VBATT= 4.0V, TEMP = EN= CHG= unconnected, RISET= 2.8kΩto GND, CIN= 1µF, CBATT= 1µF, CVL= 0.47µF, TA=
+25°C, unless otherwise noted.)
CHARGE CURRENT
vs. AMBIENT TEMPERATURE (TEMP = OPEN)
MAX1507 toc09
AMBIENT TEMPERATURE (°C)
CHARGE CURRENT (mA)
VBATT = 4.0V
VBATT = 3.6V
RISET = 1.87kΩ
CHARGE CURRENT
vs. AMBIENT TEMPERATURE (TEMP = GND)
MAX1507 toc10
AMBIENT TEMPERATURE (°C)
CHARGE CURRENT (mA)
VBATT = 4.0V
VBATT = 3.6V
RISET = 1.87kΩ
Pin Description
PINNAMEFUNCTIONVLInternally Generated Logic Supply for Chip. Bypass VL to GND with a 0.47µF capacitor.INInput Supply Voltage. Bypass IN to GND with a 1µF capacitor to improve line noise and transient rejection.GNDGround. Connect GND and exposed pad to a large copper trace for maximum power dissipation.ISET
Charge-Current Program and Fast-Charge Current Monitor. Output current from ISET is 0.958mA per amp of
battery charging current. The charging current is set by connecting a resistor from ISET to GND. Fast-charge
current = 1461V / RISETΩ.ENLogic-Level Enable Input. Drive EN high to disable charger. Pull EN low or float for normal operation. EN has
an internal 200kΩ pulldown resistor.TEMP
Three-Level Input Pin. Connect TEMP to VL, GND, or leave floating. Sets maximum die temperature for
thermal regulation loop. Connection to GND = +90°C, floating = +100°C, VL = +130°C. TEMP is Hi-Z during
shutdown.BATTLi+ Battery Connection. Bypass BATT to GND with a capacitor of at least 1µF per ampere of charge current.CHG
Charging Indicator, Open-Drain Output. CHG goes low (and can turn on an LED) when charging begins.
CHG is high impedance when the battery current drops below 10% of the fast-charging current, or when EN
is high. Connect a pullup resistor to the µP’s I/O voltage when interfacing with a µP logic input.PADExposed Pad. Connect exposed pad to a large copper trace for maximum power dissipation. The pad is
internally connected to GND.
MAX1507
Linear Li+ Battery Charger with Integrated Pass FET
and Thermal Regulation in 3mm x 3mm Thin DFNMAX1507
OUTPUT DRIVER,
CURRENT SENSE,
AND LOGIC
VLUVLO
VINOVLO
INOK
REFOK
VLOK
REFOK
REF
LOGIC
TEMPERATURE
SENSOR
VREF
IREF
ISET
0.47μF
BATT
TEMP
200kΩ
GND
+90°C
+100°C
+130°C
BATT
CHG
Detailed DescriptionThe MAX1507 charger uses voltage, current, and ther-
mal-control loops to charge a single Li+ cell and to pro-
tect the battery (Figure 1). When a Li+ battery with a
cell voltage below 2.5V is inserted, the MAX1507
charger enters the prequalification stage where it
precharges that cell with 10% of the user-programmed
fast-charge current. The CHGindicator output is driven
low (Figure 2) to indicate entry into the prequalification
state. Once the cell has passed 2.5V, the charger soft-
starts before it enters the fast-charge stage. The fast-
charge current level is programmed through a resistor
from ISET to ground. As the battery voltage approach-
es 4.2V, the charging current is reduced. If the battery
current drops to less than 10% of the fast-charging cur-
rent, the CHGindicator goes high impedance, signal-
ing the battery is fully charged. At this point the
MAX1507 enters a constant voltage-regulation mode to
Figure 1. Functional Diagram
