ISL9222A datasheet(5/8 Pages) RENESAS

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ISL9222A

FN6704 Rev 0.00

Page 5 of 8

July 28, 2008

Description

The ISL9222A 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

ISL9222A 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

+115OC

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

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