ACT8712 View Datasheet(PDF) - Active-Semi, Inc
Part Name
Description
Manufacturer
ACT8712 Datasheet PDF : 36 Pages
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ACT8712
Rev0, 25-Feb-08
PIN DESCRIPTIONS CONT’D
PIN
NAME
DESCRIPTION
17
GA
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.
18
FB3
Feedback Sense for REG3. Connect this pin to the LED string current sense resistor to
sense the LED current.
19
OVP3
Over-Voltage Protection Input for REG3. Connect this pin directly to the output node to
sense and prevent over-voltage conditions.
20
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.
21
SW3 Switching Node Output for REG3. Connect this pin to the switching end of the inductor.
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-
22
nSTAT 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.
Tri-State Charging State Select Input. When ISET1[ ] = [0000], drive CHGLEV to VSYS or
23
CHGLEV
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.
24
BAT
Battery Charger Output. Connect this pin directly to the battery anode (+ terminal) 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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