ACT8828(2009) View Datasheet(PDF) - Active-Semi, Inc
Part Name
Description
Manufacturer
ACT8828 Datasheet PDF : 49 Pages
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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
-5-
ActivePMUTM and ActivePathTM are trademarks of Active-Semi.
I2CTM is a trademark of Philips Electronics.
www.active-semi.com
Copyright © 2009 Active-Semi, Inc.
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