ACTIVE-SEMI ACT8942

ACT8942
Product Brief, 05-Dec-12
Advanced PMU for Amlogic AML8726-M3 Processor
FEATURES
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Three Step-Down DC/DC Converters
Four Low-Dropout Linear Regulators
Integrated ActivePathTM Charger
I2CTM Serial Interface
Advanced Enable/Disable Sequencing Controller
Minimal External Components
Tiny 5×5mm TQFN55-40 Package
− 0.75mm Package Height
− Pb-Free and RoHS Compliant
GENERAL DESCRIPTION
The ACT8942 is a complete, cost effective, highlyefficient ActivePMUTM power management solution,
optimized for the unique power, voltagesequencing, and control requirements of the
Amlogic AML8726-M3 processor. It is ideal for a wide
range of high performance portable handheld
applications such as tablet or pad devices. This device
integrates the ActivePathTM complete battery charging
and management system with seven power supply
channels.
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.
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 1150mA of output
current, while the third supports up to 1300mA. All
four low-dropout linear regulators are highperformance, low-noise regulators that supply up to
80mA, 320mA, 320mA, 320mA, respectively.
The ACT8942 is available in a compact, Pb-Free
and RoHS-compliant TQFN55-40 package.
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 © 2012 Active-Semi, Inc.
ACT8942
Product Brief, 05-Dec-12
PRODUCT OPTIONS
Block
Function
Output Voltage
Capability
REG1
Step-Down DC/DC
0.6V to 3.9V
1150mA
REG2
Step-Down DC/DC
0.6V to 3.9V
1150mA
REG3
Step-Down DC/DC
0.6V to 3.9V
1300mA
REG4
LDO
0.6V to 3.9V
80mA
REG5
LDO
0.6V to 3.9V
320mA
REG6
LDO
0.6V to 3.9V
320mA
REG7
LDO
0.6V to 3.9V
320mA
FUNCTIONAL BLOCK DIAGRAM
(Optional)
BODY
SWITCH
4.35V to 6V CHGIN
AC Adaptor
ACT8942
VSYS
System Supply
BAT
Li+ Battery
USB
ACIN
BODY
SWITCH
ActivePath
Control
VSYS
nSTAT
+
102µA
CURRENT SENSE
CHARGE STATUS
TH
VOLTAGE SENSE
PRECONDITION
Charge
Control
CHGLEV
2.85V
VP1
ISET
To VSYS
THERMAL
REGULATION
OUT4
110°C
SW1
OUT1
nRSTO
OUT1
VSYS
GP12
nPBIN
PUSH BUTTON
VP2
To VSYS
OUT4
SW2
nPBSTAT
OUT2
OUT2
OUT4
GP12
nIRQ
VP3
To VSYS
SW3
PWRHLD
OUT3
OUT3
System
Control
PWREN
GP3
VSEL
INL
To VSYS
SCL
REG4
LDO
SDA
BAT
LBI
REG5
LDO
1.2V
OUT4
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.
EP
-2-
www.active-semi.com
Copyright © 2012 Active-Semi, Inc.