Single-/Dual-Input 1-Cell Li+ Chargers with

OVP Protection and Programmable Charge Timer

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5

PIN

MAX8600

MAX8601

NAME

FUNCTION

1

1, 7

BAT

Battery Connection. The IC delivers charging current and monitors battery voltage using BAT.

Bypass BAT to GND with a 2.2µF or larger ceramic capacitor. Connect both BAT inputs

together externally (MAX8601). BAT is high impedance when the IC is disabled.

2

2

SETI

DC Charge-Current Programming Input. Connect a resistor from SETI to GND to set the

maximum charging current when using the DC input, the prequal current from either input,

and the CHG turn-off threshold.

3

3

THM

Thermistor Input. Connect a 10k

Ω NTC thermistor, in close proximity to the battery, from THM

to ground to monitor the battery temperature. Connect THM to GND to disable the thermistor

4

4

GND

Ground

55

CT

Timing Capacitor Input. Connect a capacitor from CT to GND to set the precharge timeout,

top-off time, and fast-charge timeout. Connect CT to GND to disable the timers.

6, 7, 9

—

N.C.

No Connection. Make no external circuit connection.

88

EN

Active-Low Enable Input. Drive low or connect EN to GND to enable the charger. Drive EN

high to disable the charger.

10

10

POK

Power-OK Monitor. POK is an open-drain output that pulls low when a valid charging source is

detected at either DC or USB (MAX8601). POK is high impedance when EN is high.

11

11

CHG

Charging-Status Output. CHG goes low when the battery is above 3V and being charged with

when the charger is in prequal, top-off, or disabled.

Pin Description

Typical Operating Characteristics (continued)

100

400

300

200

500

600

700

800

900

1000

1100

-40

10

-15

35

60

85

CHARGE CURRENT vs. AMBIENT

TEMPERATURE (1A CHARGE)

°C)

Ω

0

100

200

300

400

500

600

700

800

0.010

0.045

0.080

0.115

0.150

μF)