ACTIVE-SEMI ACT8828 Six channel activepathâ ¢ power management ic Datasheet

Active-Semi
Product Brief, 12-Mar-09
Advanced Information―All Information Subject to Change
Six Channel ActivePathTM Power Management IC
FEATURES
GENERAL DESCRIPTION
 Six Functions Integrated Into One Package:
The patent-pending ACT8828 is a complete, cost
effective, highly-efficient ActivePMUTM power
management solution that is ideal for a wide range of
high performance portable handheld applications such
as personal navigation devices (PNDs). This device
integrates the ActivePath complete battery charging and
management system with four power supply channels.
 ActivePath Li+ Charger and System Power
Selection
 1.3A High Efficiency Step-Down DC/DC
 1.0A High Efficiency Step-Down DC/DC
 0.55A High Efficiency Step-Down DC/DC
 30V Step-Up DC/DC for up to 7s × 3p WLEDs
TM




The ActivePath architecture automatically selects the
best available input supply for the system. If the
external input source is not present or the system load
current is more than the input source can provide, the
ActivePath supplies additional current from the battery
to the system. The charger is a complete, thermallyregulated, stand-alone single-cell linear Li+ charger
that incorporates an internal power MOSFET.
I2CTM Serial Interface
Minimal External Components
Compatible with USB or AC-Adapter Charging
55mm, Thin-QFN (TQFN55-40) Package
 Only 0.75mm Height
 RoHS Compliant
REG1, REG2, and REG3 are three independent,
fixed-frequency, current-mode step-down DC/DC
converters that output 1.3A, 1.0A, and 0.55A,
respectively. REG4 is a fixed-frequency, step-up
DC/DC converter that safely and efficiently biases
strings of up to 7 white-LEDs (up to a total of 21
LEDs) for display backlight applications. Finally, an
I2C serial interface provides programmability for the
DC/DC converters.
APPLICATIONS
 Personal Navigation Devices
 Portable Media Players
 Smart Phones
Tiny 5mm × 5mm 40-pin Thin-QFN package that is
just 0.75mm thin.
SYSTEM BLOCK DIAGRAM
CHG_IN
CHGLEV
DCCC
ISET
ACIN
nSTAT
Li+ Battery
Programmable
Up to 1A
VSYS
TM
ActivePath
&
Single-Cell Li+
Battery Charger
REG1
Step-Down
DC/DC
REG2
Step-Down
DC/DC
nPBIN
nIRQ
nRSTO
REG3
Step-Down
DC/DC
SCL
SDA
ON1
System
Control
REG4
Step-Up
DC/DC
ON2
ON3
ON4
ACT8828
PMU
VSEL
Innovative PowerTM
ActivePMUTM and ActivePathTM are trademarks of Active-Semi.
I2CTM is a trademark of Philips Electronics.
Active
-1-
OUT1
Adjustable, or
0.8V to 4.4V
Up to 1.3A
OUT2
Adjustable, or
0.8V to 4.4V
Up to 1.0A
OUT3
Adjustable, or
0.8V to 4.4V
Up to 0.55A
OUT4
Up to 30V
7s x 3p WLEDs
TM
www.active-semi.com
Copyright © 2009 Active-Semi, Inc.
ACT8828
Active-Semi
Product Brief, 12-Mar-09
PRODUCT OPTIONS
Block
Function
Output Voltage
Capability
ActivePath
System Power Selection
4.6V
Up to 2.4A
CHGR
Battery Charger
4.20V (4.10V to 4.30V available)
Programmable up to 1A
REG1
Step-Down DC/DC
REG2
Step-Down DC/DC
REG3
Step-Down DC/DC
REG4
Step-Up DC/DC
1.3A
Adjustable, or 0.8V to 4.4V
1.0A
0.55A
Up to 30V
Up to 7s × 3p WLEDs
: Output voltage options detailed in this table represent standard voltage options, and are available for samples or production orders.
Contact Active-Semi for more information regarding semi-custom output voltage combinations.
: Contact factory for additional available products or custom requirements.
FUNCTIONAL BLOCK DIAGRAM
BODY
SWITCH
(Optional)
CHG_IN
Up to 12V
AC Adaptor
USB
ACT8828
VSYS
System Supply
BODY
SWITCH
ACIN
BAT
Li+ Battery
DCCC
ActivePath
Control
VSYS
+
TH
CURRENT SENSE
nSTAT
VOLTAGE SENSE
PRECONDITION
CHARGE STATUS
2.9V
Charge
Control
ISET
THERMAL
REGULATION
BTR
110°C
VSYS
CHGLEV
OUT1
VP1
To VSYS
nRSTO
REG1
SW1
VSYS
nPBIN
OUT1
OUT1
GP1
PUSH BUTTON
OUT1
VP2
nIRQ
To VSYS
REG2
SW2
OUT2
OUT2
GP2
SCL
VP3
SDA
To VSYS
System
Control
SW3
REG3
ON1
ON2
OUT3
OUT3
ON3
GP3
ON4
SW4
OVP4
REG4
VSEL
REFBP
Reference
FB4
To VSYS
OUT4
7s × 3p
WLEDs
GP4
GA
EP
Innovative PowerTM
-2-
www.active-semi.com
Copyright © 2009 Active-Semi, Inc.
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