ACT8798
Rev0, 10-Oct-08
Six Channel Integrated Power Management IC
for Handheld Portable Equipment
FEATURES
•
Multiple Patents Pending
•
Six Integrated Regulators
−
1.2A PWM Step-Down DC/DC
−
1.2A PWM Step-Down DC/DC
−
750mA PWM Step-Down DC/DC
−
250mA Low Noise LDO
−
250mA Low Noise LDO
−
250mA Low Noise LDO
GENERAL DESCRIPTION
The patent-pending ACT8798 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 three step-down DC/DC converters and
three low dropout linear regulators (LDOs) into a
single, thin, space-saving package. An I
2
C Serial
Interface provides programmability for the DC/DC
converters and LDOs.
REG1, REG2 and REG3 are fixed-frequency, cur-
rent-mode PWM step-down DC/DC converters that
are optimized for high efficiency and are capable of
supplying up to 1.2A, 1.2A and 750mA, respec-
tively. REG4, REG5 and REG6 are low noise, high
PSRR linear regulators that are capable of supply-
ing up to 250mA each.
The ACT8798 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
REG2
Step-Down
DC/DC
Battery
nMSTR
nRSTO
PWRHLD
ON3
SCL
SDA
OUT1
1.1V to 4.4V
Up to 1.2A
System
Control
OUT2
1.1V to 4.4V
Up to 1.2A
OUT3
1.1V to 4.4V
Up to 750mA
OUT4
0.645V to 3.7V
Up to 250mA
OUT5
1.4V to 3.7V
Up to 250mA
OUT6
1.4V to 3.7V
Up to 250mA
REG3
Step-Down
DC/DC
REG4
LDO
Pb-free
REG1
Step-Down
DC/DC
REG5
LDO
ACT8798
Active
REG6
LDO
PMU
TM
Innovative Power
TM
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.