ACT8740 데이터 시트보기 (PDF) - Active-Semi, Inc

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ACT8740

Six Channel Integrated Power Management IC for Handheld Portable Equipment

Active-Semi, Inc 

ACT8740

Rev PrB, 25-Feb-08

PIN DESCRIPTIONS CONT’D

PIN NAME

DESCRIPTION

18

REFBP

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

discharged to GA in shutdown.

19

FB2

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

the LED current.

20

OVP2

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

and prevent over-voltage conditions.

21

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.

22

SW2 Switching Node Output for REG2. Connect this pin to the switching end of the inductor.

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

23 CHGLEV 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.

24

BAT

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

nal) to sense the battery voltage.

EP

EP Exposed Pad. Must be soldered to ground on PCB.

Innovative Products. Active Solutions.

-6-

ActivePMUTM is a trademark of Active-Semi.

I2CTM is a trademark of Philips Electronics.

www.active-semi.com

Copyright © 2008 Active-Semi, Inc.

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