Rev0, 25-Feb-08
Advanced Product Information―All Information Subject to Change
ACT8712
Four Channel Integrated Power Management IC
for Handheld Portable Equipment
FEATURES
•
Multiple Patents Pending
•
Li+ Battery Charger with Integrated MOSFET
−
Programmable Charge Current up to 1A
−
ON/OFF Control and Status Indication
GENERAL DESCRIPTION
The patent-pending ACT8712 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 PWM step-down DC/DC converters, one
PWM 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. An I
2
C Serial Interface provides program-
mability for the DC/DC converters and battery
charger.
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 PWM step-up 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. All DC/DC con-
verters’ output voltage are programmable and con-
trollable via the I
2
C interface.
The ACT8712 is available in a tiny 4mm x 4mm
24-pin Thin-QFN package that is just 0.75mm thin.
•
Three Integrated Regulators
−
550mA Step-Down DC/DC
−
750mA Step-Down DC/DC
−
Step-Up DC/DC with OVP for WLED Bias
•
I
2
C
TM
Compatible Serial Interface
−
Programmable Output Voltages
−
Configurable Operating Modes
•
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
nMSTR
nIRQ
nRSTO
SCL
SDA
ON1
ON2
Single-Cell Li+
Battery Charger
Battery
Programmable
Up to 1A
REG1
Step-Down
DC/DC
System Control
OUT1
1.1V to 4.4V
Up to 550mA
OUT2
1.1V to 4.4V
Up to 750mA
REG2
Step-Down
DC/DC
Pb-free
ACT8712
Active
REG3
Step-Up
DC/DC
PMU
TM
OUT3
WLED Bias
Innovative Products.
Active Solutions.
ActivePMU
is a trademark of Active-Semi.
I
2
C
TM
is a trademark of Philips Electronics.
TM
-1-
www.active-semi.com
Copyright © 2008 Active-Semi, Inc.
ACTIVE-SEMI [ ACTIVE-SEMI, INC ]
