ACT8770 View Datasheet(PDF) - Active-Semi, Inc
Part Name
Description
Manufacturer
ACT8770 Datasheet PDF : 2 Pages
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ACT8770
Product Brief, 19-Feb-08
Advanced Information―All Information Subject to Change
Six Channel Integrated Power Management IC
for Handheld Portable Equipment
FEATURES
• Multiple Patents Pending
• Li+ Battery Charger with Integrated MOSFET
− Auto-Select Charge Current (AC or USB)
− ON/OFF Control and Status Indication
• Five Integrated Regulators
− 350mA PWM Step-Down DC/DC
− 550mA PWM Step-Down DC/DC
− 250mA High PSRR LDO
− 250mA High PSRR LDO
− 250mA High PSRR LDO
• 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 ACT8770 is a complete, cost-
effective, highly efficient ActivePMUTM integrated
power management solution that is ideal for a wide
range of portable handheld equipment. This device
integrates two PWM step-down DC/DC converters,
three low dropout linear regulators (LDOs) 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 to 350mA and 550mA, respectively. The three
LDOs are high PSRR linear regulators, each capa-
ble of supplying up to 250mA. The battery charger
incorporates an internal power MOSFET for con-
stant-current/constant-voltage, thermally regulated
charging of a single-cell Li+ battery.
The ACT8770 is available in a tiny 4mm x 4mm
24-pin Thin-QFN package that is just 0.75mm thin.
SYSTEM BLOCK DIAGRAM
VIN
ACIN
CHGLEV
nSTAT
nMSTR
nIRQ
ON1
ON3
ON5
Single Cell
Li+ Battery
Charger
System
Control
ACT8770
PMU TM
Active
REG1
Step-Down
DC/DC
REG2
Step-Down
DC/DC
REG3
LDO
REG4
LDO
REG5
LDO
Battery
Selectable up to 1A
OUT1
0.645V to 3.3V
Up to 350mA
OUT2
0.645V to 3.3V
Up to 550mA
OUT3
1.4V to 3.7V
Up to 250mA
OUT4
1.4V to 3.7V
Up to 250mA
OUT5
1.4V to 3.7V
Up to 250mA
Innovative Products. Active Solutions.
-1-
ActivePMUTM is a trademark of Active-Semi.
www.active-semi.com
Copyright © 2008 Active-Semi, Inc.
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