ACT8701 View Datasheet(PDF) - Active-Semi, Inc
Part Name
Description
Manufacturer
ACT8701 Datasheet PDF : 2 Pages
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ACT8701
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
− 350mA PWM Step-Down DC/DC
− 550mA PWM Step-Down DC/DC
− Step-Up DC/DC with OVP
• 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 ACT8701 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, one step-
up DC/DC converter with over-voltage protection
(OVP), and a full-featured, linear-mode Li+ battery
charger into a single, 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 350mA and 550mA, respectively. REG3 is
a fixed-frequency, step-up DC/DC converter that
can be configured to generate a 3.3V buck/boost
output or can be used in a wide variety of regulated-
voltage applications such as TFT panel biasing.
The battery charger incorporates an internal power
MOSFET for constant-current/constant-voltage
thermally regulated charging of a single-cell Li+
battery.
The ACT8701 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
ACT8701
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 350mA
OUT2
1.2V to 3.3V
Up to 550mA
OUT3
Up to 27.5V
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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