Datasheet

Stand-Alone Switch-Mode
Lithium-Ion Battery-Charger Controller
Pin Description
Source Current-Sense Positive Input. See Input Current Regulator section.CSSP27
Power-Supply Input. DCIN is the input supply for the VL regulator. Bypass DCIN to GND with a
0.1µF capacitor. Also used for the source undervoltage sensing.
DCIN28
Synchronous-Rectifier MOSFET Gate-Drive Bias. Bypass VLO to PGND with a 0.1µF capacitor.VLO22
High-Side MOSFET Gate Drive Bias. Connect a 0.1µF or greater capacitor from BST and LX.BST23
Power Inductor Switching Node. Connect LX to the high-side MOSFET source.LX24
High-Side MOSFET Gate-Drive OutputDHI25
Source Current-Sense Negative Input. See Input Current Regulator section.CSSN 26
Shutdown Input. Drive SHDN low to disable charging. Connect SHDN to VL for normal
operation.
SHDN
18
Battery Current-Sense Positive Input. See Charging Current Regulator section.CS19
Power GroundPGND20
Synchronous-Rectifier MOSFET Gate-Drive Output DLO21
Full-Charge Indicator. Open-drain output pulls low when charging with constant voltage in
full-charge state.
FULLCHG
17
Fast-Charge Indicator. Open-drain output pulls low when charging with constant current.
FASTCHG
16
Charge Fault Indicator. Open-drain output pulls low when charging terminates abnormally
(Table 1).
FAULT
15
Timer 2 Adjustment. Connect a capacitor from TIMER2 to GND to set the fast-charge time. See
Timers section.
TIMER214
Voltage Regulation Loop Compensation PointCCV9
Input Source Current Regulation Compensation PointCCS10
Battery-Current Regulation Loop Compensation PointCCI11
Cell-Count Programming Input. See Table 2CELL12
Timer 1 Adjustment. Connect a capacitor from TIMER1 to GND to set the prequalification,
full-charge, and top-off times. See Timers section.
TIMER113
4.2V Reference Voltage Output. Bypass REF to GND with a 1µF or larger ceramic capacitor. REF5
Analog GroundGND6
Battery Voltage-Sense Input and Current-Sense Negative InputBATT7
Voltage Adjust. Use a voltage-divider to set the VADJ voltage between 0 and V
REF
to adjust the
battery regulation voltage by ±5%. See Setting the Voltage Limit section.
VADJ8
Thermistor Input. Connect a thermistor from THM to GND to set a qualification temperature
range. If unused, connect a 10kΩ resistor from THM to ground. See Thermistor section.
THM4
Battery Charging Current Adjust. Use a voltage-divider to set the voltage between 0 and V
REF
.
See Charging Current Regulator section.
ISETOUT3
PIN
Input Current Limit Adjust. Use a voltage-divider to set the voltage between 0 and V
REF
.
See Input Current Regulator section.
ISETIN2
Chip Power Supply. Output of the 5.4V linear regulator from DCIN. Bypass VL to GND with a
2.2µF or larger ceramic capacitor.
VL
1
FUNCTIONNAME
8
Maxim Integrated
MAX1737