APM8600

SINGLE CELL LINEAR LITHIUM BATTERY CHARGER

WITH 28V OVP AND PROGRAMMABLE CHARGE TIMER

APM8600

Document number: DS35140 Rev. 1 - 2

2 of 14

www.diodes.com

December 2010

© Diodes Incorporated

Pin Descriptions

Name

Pin #

Description

BAT

1, 7

Connection to the

Battery

The battery is charged via this pin and the BAT voltage is constantly monitored.

Connect a bypass capacitor between BAT and GND (2.2µF).

SETI

2

Charge Current

programming

The maximum charge current is programmed using a resistor from SETI to GND.

This also determines the prequal current charging level and top-off threshold.

THM

3

Thermistor Input

To monitor the battery temperature, connect a 10k

Ω NTC thermistor. Place this

thermistor as close as possible to the battery. Connect THM to GND if

temperature measurement is not required.

GND

4

Ground

Ground connection.

CT

5

Charge Timing

Connecting a capacitor from CT to GND will set the time-outs for prequal, top-off

and fast-charge. Connecting CT direct to GND disables these timers.

EN

8

Enable

(active-low)

The charger is enabled when this input is low. To start the charger connect

GND. Drive this input high to disable the charger.

POK

10

Power OK

(active-low)

When a valid input source is connected, this open-drain output is pulled low.

CHG

11

Charge Status

(active-low)

Open-drain output that indicates the charging status. It is active only in the fast-

charge state and goes high-impedance when the charger is either disabled or in

prequal or top-off mode.

DC

12, 13

DC Input

DC supply input. The recommended input voltage is between 4.32V and 7V. This

input is capable of withstanding up to 28V. Connect both DC pins together on the

PCB. It is recommended to connect a bypass capacitor (1µF) from DC to GND.

FLT

14

Fault Flag

(active-low)

If the prequal or fast-charge timers expire and the charging threshold voltage is

EP

Exposed Pad

For optimal thermal performance connect to copper on PCB (electrically this can

be GND).

NC

7,9

Not Connected

Floating pins

DNC

6

Do Not Connect

Must not connect