ISL9222 datasheet(5/8 Pages) INTERSIL

5 / 8 page

FN6643.1

March 10, 2008

Description

The ISL9222 charges a Li-ion battery using a CC/CV profile.

The constant current IREF is set with the external resistor

RIREF (See Typical Applications circuit on page 4) and the

constant voltage is fixed at 4.2V. If the battery voltage is

below a typical 2.55V trickle-charge threshold, the ISL9222

charges the battery with a trickle current of 19% of IREF until

the battery voltage rises above the trickle charge threshold.

Fast charge CC mode is maintained at the rate determined

by programming IREF until the cell voltage rises to 4.2V.

When the battery voltage reaches 4.2V, the charger enters a

CV mode and regulates the battery voltage at 4.2V to fully

charge the battery without the risk of over charge. The

charger will continue to output the 4.2V voltage until the

FIGURE 1. BLOCK DIAGRAM

VREF

+115

DIE

TEMP

VIN

PPR

GND

JIGIN

JIGON

IREF

BAT

200k

VOS

BAT

POR

CHARGE

CONTROL

PRE

REG

VCC

VREF

VCC

240k

BAT

OVP

FIGURE 2. TYPICAL CHARGE PROFILE

IREF

TRICKLE

19% IREF

4.2V

TIME

2.55V

CHARGE

CURRENT

CHARGE

VOLTAGE

ISL9222

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