ISL9205, ISL9205A, ISL9205B, ISL9205C, ISL9205D

FN9252 Rev 3.00

Page 4 of 17

September 30, 2016

ISL9205A/B/C Pin Descriptions

PIN NUMBER

PIN NAME

DESCRIPTION

1VIN

Input power source. Connect to a wall adapter.

2FAULT

An open-drain output indicating fault status. This pin is pulled to LOW under any fault

condition. When a fault condition occurs, the time counter will be reset. When the

charger is disabled, the FAULT pin outputs high impedance.

3STATUS

An open-drain output indicating charging and inhibit states. This pin is pulled LOW

when the charger is charging a battery. It will be turned into high impedance when

the charge current drops to IMIN. This high impedance state will be latched until a

recharge cycle or a new charge cycle starts. When the charger is disabled, the

STATUS pin outputs high impedance.

4TIME

Determines the oscillation period by connecting a timing capacitor between this pin

and GND. The oscillator also provides a time reference for the charger.

5GND

The connection to system ground.

6EN

Enable logic input. Connect the EN pin to LOW to disable the charger or leave it

floating to enable the charger. There is an internal 400kΩ pull-up resistor at this pin.

7

V2P8

A 2.8V reference voltage output. This pin provides a 2.8V voltage source when the

input voltage is above the POR threshold and outputs zero otherwise. The V2P8 pin

can be used as an indication for adapter presence.

8IREF

The charge current programming and monitoring pin. Connect a resistor between

this pin and GND to set the charge current during the Constant Current phase, as

9VSEN

The remote voltage sense pin. Connect this pin as close to the battery positive

terminal as possible. If the VSEN pin is left floating, its voltage drops to zero volt and

the charger operates in trickle mode.

10

VBAT

The connection to the battery. Typically a ceramic capacitor of minimum 1µF is

needed for stability when there is no battery attached. When a battery is attached,

only a 0.1µF ceramic capacitor is required.

80

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A

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=

(EQ. 3)