Product Brief, 09-Nov-07
Advanced Information - All Information Subject to Change
ACT8701
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
GENERAL DESCRIPTION
The patent-pending ACT8701 is a complete, cost-
effective, highly-efficient
ActivePMU
TM
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.
•
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.
SYSTEM BLOCK DIAGRAM
VIN
CHGLEV
nSTAT
Single Cell
Li+ Battery
Charger
Battery
100mA/500mA
REG1
Step-Down
DC/DC
nMSTR
nIRQ
nRSTO
ON1
ON2
System
Control
OUT1
1.2V to 3.3V
Up to 350mA
REG2
Step-Down
DC/DC
OUT2
1.2V to 3.3V
Up to 550mA
REG3
ACT8701
Step-Up
DC/DC
OUT3
Up to 27.5V
Innovative Products.
Active Solutions.
ActivePMU
TM
is a trademark of Active-Semi.
-1-
www.active-semi.com
Copyright © 2007 Active-Semi, Inc.
ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
