ISL9220BIRTZ-T datasheet(11/15 Pages) INTERSIL

Part #	ISL9220BIRTZ-T

Description	Switching Charger for 1-Cell Li-ion Batteries

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Manufacturer	INTERSIL [Intersil Corporation]

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ISL9220B

11

FN7652.1

July 2, 2010

and also be connected to other layers through thermal

vias. More thermal vias and more copper attached to the

exposed pad usually result in better thermal

performance. The exposed pad is big enough for 5 vias,

as shown in Figure 4.

Charging Flow Chart

The charging flow chart is shown in Figure 5. The

charging starts with trickle charge current, the ISL9220B

charges the battery in 50mA. If VBAT reaches VPCHG

before the trickle charge timeout interval, the operation

will move to the CC mode. When the output voltage

reaches the 4.2V final voltage, the operation will move to

CV mode, where the battery is charged at a constant

voltage. If the end-of-charge current is reached before

the timeout interval is elapsed, the operation moves to

charge complete state. The charging is terminated. After

the termination, if the output voltage drops below the

recharge threshold, a recharge starts and the timer is

reset to zero.

In the event that the timeout condition is reached before

the EOC condition is reached, the fault mode is entered.

The fault mode can also be triggered by a VBAT OVP

event. To exit the fault mode, the input power has to be

removed and re-applied, or the EN pin is toggled to HI

and back to LO, then a new cycle starts.

FIGURE 4.

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