6

FN9242.1

January 3, 2006

Pin Descriptions

VIN (Pin1)

VIN is the input power source. Connect to a wall adapter.

NC (Pin 2)

No connection for this pin.

STATUS (Pin 3)

STATUS is an open-drain output indicating charging and

inhibit states. The STATUS pin is pulled LOW when the

charger is charging a battery. It will be forced to high

impedence mode will be latched until a recharge cycle or a

new charge cycle starts.

TIME (Pin 4)

The TIME pin determines the oscillation period by

connecting a timing capacitor between this pin and GND.

The oscillator also provides a time reference for the charger.

GND (Pin 5)

GND is the connection to system ground.

EN (Pin 6)

EN is the enable logic input. Connect the EN pin to LOW to

disable the charger or leave it floating to enable the charger.

V2P8 (Pin 7)

This is a 2.8V reference voltage output. This pin outputs a

2.8V voltage source when the input voltage is above POR

threshold, otherwise it outputs zero. The V2P8 pin can be

used as an indication for adapter presence.

IREF (Pin 8)

This is the programming input for the constant charging

current. It maintains at 0.8V when the charger is in normal

operation.

VSEN (Pin 9)

VSEN is the remote voltage sense pin. Connect this pin as

close as possible to the battery pack positive connection. If

the VSEN pin is floating, its voltage drops to zero volt and

the charger operates in the trickle mode.

VBAT (Pin 10)

VBAT is the connection to the battery. Typically a 10

µF

Tantalum capacitor is needed for stability when there is no

battery attached. When a battery is attached, only a 0.1

µF

ceramic capacitor is required.

FIGURE 15. STATUS PIN VOLTAGE vs CURRENT WHEN THE OPEN-DRAIN MOSFET TURNS ON

0

4

8

12

16

20

24

28

0.0 0.5

1.0 1.5 2.0

2.5 3.0 3.5 4.0

4.5 5.0

STATUS PIN VOLTAGE (V)

ISL9203R5220