Product Brief, 03-Feb-08
Advanced 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
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 inte-
grates one PWM step-down DC/DC converter, one
PWM step-up DC/DC converter with over-voltage
protection (OVP), three low dropout linear regula-
tors (LDOs) and a full-featured linear-mode Li+ bat-
tery charger into a single, thin, space-saving pack-
age. An I
2
C Serial Interface provides programmabil-
ity 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 back-
lighting. REG3, REG4 and REG5 are low noise,
high PSRR linear regulators that are capable of
supplying up to 350mA, 250mA and 250mA, re-
spectively. The battery charger incorporates an
internal power MOSFET for constant-
current/constant-voltage, thermally regulated charg-
ing 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.
•
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
•
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
REG1
Step-Down
DC/DC
Battery
Programmable
Up to 1A
OUT1
1.1V to 4.4V
Up to 350mA
OUT2
WLED Bias
OUT3
1.4V to 3.7V
Up to 350mA
OUT4
1.4V to 3.7V
Up to 250mA
OUT5
1.4V to 3.7V
Up to 250mA
VIN
CHGLEV
Single Cell Li+
Battery Charger
REG2
nMSTR
nIRQ
SCL
SDA
ON1
System
Control
Step-Up
DC/DC
REG3
LDO
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 ]
