ACT8828
Rev 7, 15-Nov-12
Six Channel
ActivePath
TM
Power Management IC
FEATURES
•
ActivePath
TM
Li+ Charger with System Power
Selection
GENERAL DESCRIPTION
The patent-pending ACT8828 is a complete, cost
effective, highly-efficient
ActivePMU
TM
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.
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, thermally-
regulated, stand-alone single-cell linear Li+ charger
that incorporates an internal power MOSFET.
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
I
2
C serial interface provides programmability for the
DC/DC converters.
The ACT8828 is available in a tiny 5mm × 5mm 40-
pin Thin-QFN package that is just 0.75mm thin.
•
Four Integrated Regulators:
−
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
•
•
•
•
I
2
C
TM
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
APPLICATIONS
•
Personal Navigation Devices
•
Portable Media Players
•
Smart Phones
SYSTEM BLOCK DIAGRAM
CHG_IN
CHGLEV
DCCC
ISET
ACIN
nSTAT
nPBIN
nIRQ
nRSTO
SCL
SDA
ON1
ON2
ON3
ON4
VSEL
System
Control
Li+ Battery
Programmable
Up to 1A
VSYS
REG1
Step-Down
DC/DC
REG2
Step-Down
DC/DC
REG3
Step-Down
DC/DC
REG4
Step-Up
DC/DC
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
ActivePath
TM
&
Single-Cell Li+
Battery Charger
ACT8828
Active
PMU
TM
Innovative Power
TM
ActivePMU
TM
and
ActivePath
TM
are trademarks of Active-Semi.
I
2
C
TM
is a trademark of NXP.
-1-
www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
ACT8828
Rev 7, 15-Nov-12
TABLE OF CONTENTS
GENERAL INFORMATION ..........................................................................................P. 01
Functional Block Diagram ...................................................................................................... p. 03
Ordering Information .............................................................................................................. p. 04
Pin Configuration .................................................................................................................... p. 04
Pin Descriptions ..................................................................................................................... p. 05
Absolute Maximum Ratings.................................................................................................... p. 07
SYSTEM MANAGEMENT ...........................................................................................P. 08
Register Descriptions ............................................................................................................. p. 08
I
2
C Interface Electrical Characteristics ................................................................................... p. 09
Electrical Characteristics ........................................................................................................ p. 10
Register Descriptions ............................................................................................................. p. 11
Typical Performance Characteristics...................................................................................... p. 12
Functional Description ............................................................................................................ p. 13
STEP-DOWN DC/DC CONVERTERS ..........................................................................P. 17
Electrical Characteristics ........................................................................................................ p. 17
Typical Performance Characteristics...................................................................................... p. 20
Register Descriptions ............................................................................................................. p. 22
Functional Description ............................................................................................................ p. 28
STEP-UP DC/DC CONVERTERS ................................................................................P. 31
Electrical Characteristics ........................................................................................................ p. 31
Typical Performance Characteristics...................................................................................... p. 32
Register Descriptions ............................................................................................................. p. 33
Functional Description ............................................................................................................ p. 35
ActivePath
TM
CHARGER .............................................................................................P. 37
Electrical Characteristics ........................................................................................................ p. 37
Typical Performance Characteristics...................................................................................... p. 39
Functional Description ............................................................................................................ p. 41
PACKAGE INFORMATION ..........................................................................................P. 50
Innovative Power
TM
ActivePMU
TM
and
ActivePath
TM
are trademarks of Active-Semi.
I
2
C
TM
is a trademark of NXP.
-2-
www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
ACT8828
Rev 7, 15-Nov-12
FUNCTIONAL BLOCK DIAGRAM
BODY
SWITCH
(Optional)
AC Adaptor
USB
CHG_IN
Up to 12V
ACIN
ACT8828
BODY
SWITCH
VSYS
System Supply
BAT
DCCC
VSYS
ActivePath
Control
CURRENT SENSE
100礎
Li+ Battery
+
TH
nSTAT
CHARGE STATUS
VOLTAGE SENSE
PRE-
CONDITION
2.9V
110癈
BTR
ISET
VSYS
CHGLEV
OUT1
nRSTO
Charge
Control
THERMAL
REGULATION
VP1
To VSYS
SW1
REG1
OUT1
OUT1
GP1
VP2
nIRQ
SW2
REG2
OUT2
OUT2
GP2
VP3
VSYS
nPBIN
PUSH BUTTON
OUT1
To VSYS
SCL
SDA
ON1
ON2
ON3
ON4
VSEL
REFBP
GA
EP
REG4
System
Control
REG3
To VSYS
SW3
OUT3
OUT3
GP3
SW4
OVP4
FB4
GP4
To VSYS
OUT4
7s x 3p
WLEDs
Reference
Innovative Power
TM
ActivePMU
TM
and
ActivePath
TM
are trademarks of Active-Semi.
I
2
C
TM
is a trademark of NXP.
-3-
www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
ACT8828
Rev 7, 15-Nov-12
ORDERING INFORMATION
PART
NUMBER
ACT8828QJ1D2-T
ACT8828QJ250-T
ACT8828QJ3B9-T
V
OUT1
/V
STBY1
1.2V/1.2V
3.3V/3.3V
1.2V/1.2V
V
OUT2
/V
STBY2
1.9V/1.9V
1.85V/1.85V
1.8V/1.8V
V
OUT3
/V
STBY3
3.3V/3.3V
1.25V/1.25V
3.3V/3.3V
CONTROL SEQUENCE
Sequence A
Sequence B
Sequence C
PACKAGING DETAILS
ACT8828QJ###-T
PACKAGE
TQFN55-40
PINS
40
TEMPERATURE
RANGE
-40°C to +85°C
PACKING
TAPE & REEL
: All Active-Semi components are RoHS Compliant and with Pb-free plating unless specified differently. The term Pb-free means
semiconductor products that are in compliance with current RoHS (Restriction of Hazardous Substances) standards.
: To select V
STBYx
as a output regulation voltage of REGx, tie VSEL to VSYS or a logic high.
:
Refer to the Control Sequence section for more information.
PIN CONFIGURATION
TOP VIEW
CHGLEV
nRSTO
REFBP
nSTAT
nIRQ
SW4
ON4
ON2
GP4
GA
TH
DCCC
BTR
ACIN
BAT
BAT
VSYS
VSYS
CHG_IN
ISET
OVP4
FB4
VP3
SW3
GP3
ACT8828
OUT3
nPBIN
SDA
EP
SCL
ON3
VSEL
ON1
Thin - QFN (TQFN55-40)
OUT2
VP2
SW2
GP2
GP1
SW1
VP1
OUT1
Innovative Power
TM
ActivePMU
TM
and
ActivePath
TM
are trademarks of Active-Semi.
I
2
C
TM
is a trademark of NXP.
-4-
www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
ACT8828
Rev 7, 15-Nov-12
PIN DESCRIPTIONS
PIN
1
NAME
TH
DESCRIPTION
Temperature Sensing Input. Connect to battery thermistor. TH is pulled up with a 100µA current
internally. See the
Battery Temperature Monitoring
section for more information.
Dynamic Charging Current Control. Connect a resistor to set the dynamic charging current control
point. A internal 100µA current source sets up a voltage that is used to compare with VSYS and
dynamically scale the charging current to maintain VSYS regulation. See the
Dynamic Charge
Current Control
section for more information.
Safety Timer Program Pin. The resistance between this pin and GA determines the timers timeout
values. See the
Charging Safety Timers
section for more information.
AC Adaptor Detect. Detects presence of a wall adaptor and automatically adjusts the charge
current to the maximum charge current level. Do not leave ACIN floating.
Battery Charger Output. Connect this pin directly to the battery anode (+ terminal)
System Output Pin. Bypass to GA with a 10µF or larger ceramic capacitor.
Power Input for the Battery Charger. Bypass CHG_IN to GA with a capacitor placed as close to
the IC as possible. The battery charger are automatically enabled when a valid voltage is present
on CHG_IN.
Charge Current Set. Program the maximum charge current by connecting a resistor (R
ISET
) between
ISET and GA. See the
Charger Current Programming
section for more information.
Step-Down DC/DCs Output Voltage Selection. Drive to logic low to select default output voltage.
Drive to logic high to select secondary output voltage. See the
Output Voltage Selection Pin
section for more information.
Independent Enable Control Input for REG1. Drive ON1 to VSYS or to a logic high for normal
operation, drive to GA or a logic low to disable REG1. Do not leave ON1 floating.
Output Feedback Sense for REG2. Connect this pin directly to the output node to connect the
internal feedback network to the output voltage.
Power Input for REG2. Bypass to GP2 with a high quality ceramic capacitor placed as close as
possible to the IC.
Switching Node Output for REG2. Connect this pin to the switching end of the inductor.
Power Ground for REG2. Connect GA, GP1, GP2, GP3, and GP4 together at a single point as
close to the IC as possible.
Power Ground for REG1. Connect GA, GP1, GP2, GP3, and GP4 together at a single point as
close to the IC as possible.
Switching Node Output for REG1. Connect this pin to the switching end of the inductor.
Power Input for REG1. Bypass to GP1 with a high quality ceramic capacitor placed as close as
possible to the IC.
Output Feedback Sense for REG1. Connect this pin directly to the output node to connect the
internal feedback network to the output voltage.
Enable Control Input for REG3. Drive ON3 to a logic high for normal operation, drive to GA or a
logic low to disable REG3. Do not leave ON3 floating.
Clock Input for I
2
C Serial Interface.
Data Input for I
2
C Serial Interface. Data is read on the rising edge of SCL.
2
DCCC
3
4
5, 6
7, 8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
BTR
ACIN
BAT
VSYS
CHG_IN
ISET
VSEL
ON1
OUT2
VP2
SW2
GP2
GP1
SW1
VP1
OUT1
ON3
SCL
SDA
Innovative Power
TM
ActivePMU
TM
and
ActivePath
TM
are trademarks of Active-Semi.
I
2
C
TM
is a trademark of NXP.
-5-
www.active-semi.com
Copyright © 2012 Active-Semi, Inc.
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