ISL6294 datasheet(5/9 Pages) RENESAS

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ISL6294

FN9174 Rev 4.00

Page 5 of 9

Jul 9, 2007

Description

The ISL6294 charges a Li-ion battery using a CC/CV profile.

The constant current IREF is set with the external resistor

RIREF (See Figure 1) and the constant voltage is fixed at

4.2V. If the battery voltage is below a typical 2.55V trickle-

charge threshold, the ISL6294 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. Upon reaching an end-of-charge

(EOC) current, the charger indicates the charge completion

with the CHG pin, but the charger continues to output the

4.2V voltage. Figure 4 shows the typical charge waveforms

after the power is on.

The EOC current level IMIN is programmable with the

external resistor RIMIN (See Figure 1). The CHG signal turns

FIGURE 3. BLOCK DIAGRAM

VREF

+115°C

DIE

TEMP

VIN

PPR

GND

CHG

IMIN

IREF

BAT

200k

VOS

BAT

POR

CHARGE

CONTROL

PRE

REG

VCC

VREF

VCC

IREF

TRICKLE

IMIN

4.2V

TIME

2.55V

CHG

CHARGE

CURRENT

CHARGE

VOLTAGE

CHG

INDICATION

76%I REF

19%IREF

FIGURE 4. TYPICAL CHARGE PROFILE

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