ACT8935
Product Brief, 15-Aug-13
Advanced PMU for SiRF PrimaTM and Atlas IVTM
FEATURES
GENERAL DESCRIPTION
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The ACT8935 is a complete, cost effective, highlyefficient ActivePMUTM power management solution,
optimized for the unique power, voltagesequencing, and control requirements of the SiRF
PrimaTM and Atlas IVTM processors.
Optimized for SiRF PrimaTM/Atlas IVTM Processors
Three Step-Down DC/DC Converters
Four Low-Dropout Linear Regulators
Integrated ActivePathTM Charger
I2CTM Serial Interface
This device features three step-down DC/DC
converters and four low-noise, low-dropout linear
regulators, along with a complete battery charging
solution featuring the advanced ActivePathTM
system-power selection function.
Advanced Enable/Disable Sequencing Controller
Minimal External Components
Tiny 5×5mm TQFN55-40 Package
− 0.75mm Package Height
− Pb-Free and RoHS Compliant
The three DC/DC converters utilize a highefficiency, fixed-frequency (2MHz), current-mode
PWM control architecture that requires a minimum
number of external components. Two DC/DCs are
capable of supplying up to 900mA of output current,
while the third supports up to 700mA. All four lowdropout linear regulators are high-performance,
low-noise, regulators that each supply up to 150mA.
APPLICATIONS
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Personal Navigation Devices
Portable Media Players
Tablet Devices
The ACT8935 is available in a compact, Pb-Free
and RoHS-compliant TQFN55-40 package.
Smart Phones
MIDs
TYPICAL APPLICATION DIAGRAM
Innovative PowerTM
ActivePMUTM and ActivePathTM are trademarks of Active-Semi.
I2CTM is a trademark of NXP.
-1-
www.active-semi.com
Copyright © 2013 Active-Semi, Inc.
ACT8935
Product Brief, 15-Aug-13
PRODUCT OPTIONS
Block
Function
Output Voltage
Capability
ActivePath
System Power Selection
4.6V
Up to 2A
CHGR
Battery Charger
4.2V
Programmable up to 1A
REG1
Step-Down DC/DC
REG2
Step-Down DC/DC
REG3
Step-Down DC/DC
900mA
REG4
LDO
150mA
REG5
LDO
REG6
LDO
REG7
LDO
900mA
Adjustable, or 0.6V to 3.9V
700mA
150mA
0.6V to 3.9V
150mA
150mA
FUNCTIONAL BLOCK DIAGRAM
(Optional)
AC Adaptor
BODY
SWITCH
ACT8935
4.35V to 6V CHGIN
VSYS
System Supply
BAT
Li+ Battery
USB
ACIN
BODY
SWITCH
ActivePath
Control
VSYS
nSTAT
+
102µA
CURRENT SENSE
CHARGE STATUS
TH
VOLTAGE SENSE
Charge
Control
CHGLEV
PRECONDITION
2.85V
VP1
ISET
To VSYS
THERMAL
REGULATION
OUT2
110°C
SW1
OUT1
nRSTO
OUT1
GP12
PBIN
PUSH BUTTON
VP2
OUT2
To VSYS
SW2
nPBSTAT
OUT2
OUT2
OUT2
GP12
nIRQ
VP3
To VSYS
SW3
PWRHLD
OUT3
OUT3
System
Control
PWREN
GP3
EXTON
INL
To VSYS
SCL
REG4
LDO
SDA
BAT
LBI
REG5
LDO
1.2V
OUT2
OUT4
OUT4
OUT5
OUT5
+
REG6
LDO
nLBO
REG7
LDO
OUT6
OUT6
OUT7
OUT7
REFBP
Reference
GA
Innovative PowerTM
ActivePMUTM and ActivePathTM are trademarks of Active-Semi.
I2CTM is a trademark of NXP.
-2-
EP
www.active-semi.com
Copyright © 2013 Active-Semi, Inc.