ACT8740_08 datasheet(6/40 Pages) ACTIVE-SEMI

6 / 40 page

ACT8740

Rev PrB, 25-Feb-08

Innovative Products. Active Solutions.

- 6 -

www.active-semi.com

ActivePMU

TM is a trademark of Active-Semi.

2CTM is a trademark of Philips Electronics.

PIN DESCRIPTIONS CONT’D

NAME

DESCRIPTION

REFBP

Reference Noise Bypass. Connect a 0.01µF ceramic capacitor from REFBP to GA. This pin is

discharged to GA in shutdown.

FB2

Feedback Sense for REG2. Connect this pin to the LED string current sense resistor to sense

the LED current.

OVP2

Over-Voltage Protection Input for REG2. Connect this pin directly to the output node to sense

and prevent over-voltage conditions.

GP2

Power Ground for REG2. Connect GP2 directly to a power ground plane. Connect GA, GP1

and GP2 together at a single point as close to the IC as possible.

SW2

Switching Node Output for REG2. Connect this pin to the switching end of the inductor.

CHGLEV

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

logic high for high-current charging mode (450mA), and drive to GA or a logic low for low-

current charging mode (90mA). Allow CHGLEV to float (|ICHGLEV| < 2µA) to disable the charger.

BAT

Output Voltage for the Battery Charger. Connect this pin directly to the battery anode (+ termi-

nal) to sense the battery voltage.

Exposed Pad. Must be soldered to ground on PCB.

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