ACT8704 View Datasheet(PDF) - Active-Semi, Inc
Part Name
Description
Manufacturer
ACT8704 Datasheet PDF : 2 Pages
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ACT8704
Product Brief, 09-Nov-07
Advanced Information - All Information Subject to Change
Four Channel Integrated Power Management IC
for Handheld Portable Equipment
FEATURES
• Multiple Patents Pending
• Li+ Battery Charger with Integrated MOSFET
− ON/OFF Control and Status Indication
• Three Integrated Regulators
− 550mA PWM Step-Down DC/DC
− 750mA PWM Step-Down DC/DC
− Step-Up DC/DC with OVP for WLED Bias
• Minimal External Components
• 4x4mm, Thin-QFN (TQFN44-24) Package
− Only 0.75mm Height
− RoHS Compliant
APPLICATIONS
• Portable Devices and PDAs
• Digital Media Players
• Battery Operated Devices
• GPS Receivers, etc.
GENERAL DESCRIPTION
The patent-pending ACT8704 is a complete, cost-
effective, highly-efficient ActivePMUTM power man-
agement solution that is ideal for a wide range of
portable handheld equipment. This device inte-
grates two step-down DC/DC converters for proces-
sor core and I/O power, one step-up DC/DC con-
verter with over-voltage protection (OVP) and a full-
featured, linear-mode Li+ battery charger into a sin-
gle, thin, space-saving package.
REG1 and REG2 are fixed-frequency, current-mode
PWM step-down DC/DC converters that are opti-
mized for high efficiency and are capable of supply-
ing up to 550mA and 750mA, respectively. REG3 is
a fixed-frequency, step-up DC/DC converter that
safely and efficiently biases a string of up to seven
white-LEDs for backlighting. The battery charger
incorporates an internal power MOSFET for con-
stant-current/constant-voltage, thermally regulated
charging of a single-cell Li+ battery.
The ACT8704 is available in a tiny 4mm x 4mm 24-
pin Thin-QFN package that is just 0.75mm thin.
SYSTEM BLOCK DIAGRAM
VIN
CHGLEV
nSTAT
nMSTR
nIRQ
nRSTO
ON1
ON2
Single Cell
Li+ Battery
Charger
System
Control
ACT8704
REG1
Step-Down
DC/DC
REG2
Step-Down
DC/DC
REG3
Step-Up
DC/DC
Battery
100mA/500mA
OUT1
1.2V to 3.3V
Up to 550mA
OUT2
1.2V to 3.3V
Up to 750mA
OUT3
WLED Bias
Innovative Products. Active Solutions.
-1-
ActivePMUTM is a trademark of Active-Semi.
www.active-semi.com
Copyright © 2007 Active-Semi, Inc.
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