ACT8712QLCHA-T datasheet(6/36 Pages) ACTIVE-SEMI

6 / 36 page

Rev0, 25-Feb-08

ACT8712

Innovative Products. Active Solutions.

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ActivePMU

TM is a trademark of Active-Semi.

2CTM is a trademark of Philips Electronics.

PIN DESCRIPTIONS CONT’D

NAME

DESCRIPTION

Analog Ground. Connect GA directly to a quiet ground node. Connect GA, GP12, and GP3

together at a single point as close to the IC as possible.

FB3

Feedback Sense for REG3. Connect this pin to the LED string current sense resistor to

sense the LED current.

OVP3

Over-Voltage Protection Input for REG3. Connect this pin directly to the output node to

sense and prevent over-voltage conditions.

GP3

Power Ground for REG3. Connect GP3 directly to a power ground plane. Connect GA,

GP12, and GP3 together at a single point as close to the IC as possible.

SW3

Switching Node Output for REG3. Connect this pin to the switching end of the inductor.

nSTAT

Active-Low Open-Drain Charger Status Output. nSTAT sinks current whenever the charger

is charging the battery, and is high-Z otherwise. nSTAT has a 6mA (typ) current limit, allow-

ing it to directly drive an indicator LED without additional external components. To generate

a logic-level output, connect nSTAT to an appropriate supply voltage (typically OUT2)

through a 10kΩ or greater pull-up resistor.

CHGLEV

Tri-State Charging State Select Input. When ISET1[ ] = [0000], drive CHGLEV to VSYS or

to a logic high for high-current charging mode (maximum charge current of 500mA), and

drive to GA or a logic low for low-current charging mode (maximum charge current of

100mA). Allow CHGLEV to float (|ICHGLEV| < 2µA) to disable the charger.

BAT

Battery Charger Output. Connect this pin directly to the battery anode (+ terminal) to sense

the battery voltage.

Exposed Pad. Must be soldered to ground on PCB.

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