Rev PrB, 25-Feb-08
Advanced Product Information―All Information Subject to Change
ACT8740
Six 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
•
Five Integrated Regulators
−
350mA PWM Step-Down DC/DC
−
Step-Up DC/DC with OVP for WLED Bias
−
350mA Low Noise LDO
−
250mA Low Noise LDO
−
250mA Low Noise LDO
GENERAL DESCRIPTION
The patent-pending ACT8740 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 integrates
one PWM step-down DC/DC converter, one PWM
step-up DC/DC converter with over-voltage protec-
tion (OVP), three low dropout linear regulators
(LDOs) and a full-featured linear-mode Li+ battery
charger into a single, thin, space-saving package.
An I
2
C Serial Interface provides programmability for
the DC/DC converters, LDOs and battery charger.
REG1 is a fixed-frequency, current-mode PWM step
-down DC/DC converter that is optimized for high
efficiency and is capable of supplying up to 350mA
output current. REG2 is a fixed-frequency, step-up
DC/DC converter that safely and efficiently biases a
string of up to seven white-LEDs for backlighting.
REG3, REG4, and REG5 are low noise, high PSRR
linear regulators that are capable of supplying up to
350mA, 250mA, and 250mA, respectively. The bat-
tery charger incorporates an internal power MOS-
FET for constant-current/constant-voltage, thermally
regulated charging of a single-cell Li+ battery. All
DC/DC converters and LDOs output voltages are
programmable and controllable via the I
2
C interface.
The ACT8740 is available in a tiny 4mm x 4mm
24-pin Thin-QFN package that is just 0.75mm thin.
•
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
•
Wireless Handhelds
•
DMB Enabled Devices
•
GPS Receivers, etc.
SYSTEM BLOCK DIAGRAM
VIN
CHGLEV
Single-Cell Li+
Battery Charger
REG1
Step-Down
DC/DC
Battery
Programmable
Up to 1A
OUT1
1.1V to 4.4V
Up to 350mA
nMSTR
nIRQ
SCL
SDA
ON1
REG2
System Control
Step-Up
DC/DC
OUT2
WLED Bias
OUT3
1.4 to 3.7V
Up to 350mA
OUT4
1.4 to 3.7V
Up to 250mA
OUT5
1.4 to 3.7V
Up to 250mA
REG3
LDO
Pb-free
REG4
LDO
ACT8740
Active
PMU
TM
REG5
LDO
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 ]
