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PDF ACT8828 Data sheet ( Hoja de datos )
| Número de pieza | ACT8828 | |
| Descripción | Six Channel ActivePath Power Management IC | |
| Fabricantes | Active-Semi | |
| Logotipo |  |
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Active-Semi
ACT8828
Rev 3, 24-Sep-09
Six Channel ActivePathTM Power Management IC
FEATURES
• ActivePathTM Li+ Charger with System Power
Selection
• 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
• 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
APPLICATIONS
• Personal Navigation Devices
• Portable Media Players
• Smart Phones
GENERAL DESCRIPTION
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.
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
I2C 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.
SYSTEM BLOCK DIAGRAM
CHG_IN
CHGLEV
DCCC
ISET
ACIN
nSTAT
nPBIN
nIRQ
nRSTO
SCL
SDA
ON1
ON2
ON3
ON4
VSEL
ActivePathTM
&
Single-Cell Li+
Battery Charger
System
Control
REG1
Step-Down
DC/DC
REG2
Step-Down
DC/DC
REG3
Step-Down
DC/DC
REG4
Step-Up
DC/DC
ACT8828
PMUActive
TM
Innovative PowerTM
wAcwtivewPM.DUTaM taandSAhcetievetP4aUth.TnM aerte trademarks of Active-Semi.
I2CTM is a trademark of Philips Electronics.
-1-
Li+ Battery
Programmable
Up to 1A
VSYS
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
www.active-semi.com
Copyright © 2009 Active-Semi, Inc.
1 page  
Active-Semi
ACT8828
Rev 3, 24-Sep-09
PIN DESCRIPTIONS
PIN NAME
DESCRIPTION
1
TH
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
2
DCCC
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.
3
BTR
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.
4
ACIN
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.
5, 6 BAT Battery Charger Output. Connect this pin directly to the battery anode (+ terminal)
7, 8 VSYS 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
9 CHG_IN the IC as possible. The battery charger are automatically enabled when a valid voltage is present
on CHG_IN.
10
ISET
Charge Current Set. Program the maximum charge current by connecting a resistor (RISET) 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.
11 VSEL Drive to logic high to select secondary output voltage. See the Output Voltage Selection Pin
section for more information.
12
ON1
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.
13
OUT2
Output Feedback Sense for REG2. Connect this pin directly to the output node to connect the
internal feedback network to the output voltage.
14
VP2
Power Input for REG2. Bypass to GP2 with a high quality ceramic capacitor placed as close as
possible to the IC.
15 SW2 Switching Node Output for REG2. Connect this pin to the switching end of the inductor.
16
GP2
Power Ground for REG2. Connect GA, GP1, GP2, GP3, and GP4 together at a single point as
close to the IC as possible.
17
GP1
Power Ground for REG1. Connect GA, GP1, GP2, GP3, and GP4 together at a single point as
close to the IC as possible.
18 SW1 Switching Node Output for REG1. Connect this pin to the switching end of the inductor.
19
VP1
Power Input for REG1. Bypass to GP1 with a high quality ceramic capacitor placed as close as
possible to the IC.
20
OUT1
Output Feedback Sense for REG1. Connect this pin directly to the output node to connect the
internal feedback network to the output voltage.
21
ON3
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.
22 SCL Clock Input for I2C Serial Interface.
23 SDA Data Input for I2C Serial Interface. Data is read on the rising edge of SCL.
Innovative PowerTM
ActivePMUTM and ActivePathTM are trademarks of Active-Semi.
I2CTM is a trademark of Philips Electronics.
-5-
www.active-semi.com
Copyright © 2009 Active-Semi, Inc.
5 Page 
Active-Semi
ACT8828
Rev 3, 24-Sep-09
SYSTEM MANAGEMENT
REGISTER DESCRIPTIONS
Note: See Table 1 for default register settings.
Table 2:
Control Register Map
ADDRESS
D7 D6 D5
DATA
D4 D3
06h R R R W/E R
R: Read-Only bits. Default Values May Vary.
W/E: Write-Exact bits. Read/Write bits which must be written exactly as specified in Table 1.
D2
R
D1 D0
nPBMASK PBSTAT
Table 3:
Control Register Bit Descriptions
ADDRESS NAME BIT ACCESS
06h PBSTAT [0]
R
FUNCTION
Push Button Status
06h nPBMASK [1] R/W Push Button Interrupt Mask Option
06h [3:2] R
06h [4] W/E
06h [7:5] R
DESCRIPTION
0 De-assert
1 Asserted
0 Masked
1 Not Mask
READ ONLY
WRITE-EXACT
READ ONLY
Innovative PowerTM
ActivePMUTM and ActivePathTM are trademarks of Active-Semi.
I2CTM is a trademark of Philips Electronics.
- 11 -
www.active-semi.com
Copyright © 2009 Active-Semi, Inc.
11 Page | ||
| Páginas | Total 49 Páginas | |
| PDF Descargar | [ Datasheet ACT8828.PDF ] | |
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