LP28052A Datasheet, PDF (2/9 Pages) Lowpower Semiconductor inc – Vin Over Voltage Protection:6.5V

Preliminary Datasheet LP28052A
Functional Pin Description
Package Type
Pin Configurations
SOP-8(P)
NC
1
ISET 2
VSS
3
VIN
4
9
PGND
8
NC
7
STAT
6
NC
5
BATT
Pin Description
PIN
VIN
STAT
NC
VSS/PGND
ISET
PIN
Number
4
7
1,6,8
3,9
2
DESCRIPTION
VIN is the input power source. Connect to a wall adapter.
Open-Drain Charge Status Output. When the battery is charging, the STAT pin is pulled low by
an internal N-channel MOSFET. When the charge cycle is completed, the pin is pulled High.
No connector.
VSS is the connection to system ground.
Charge Current Program, Charge Current Monitor and Shutdown Pin. The charge current is pro-
grammed by connecting a 1% resistor(R_PROG)to ground. When charging in constant-current
mode, this pin servos to 1V. In all modes, the voltage on this pin can be used to measure the
charge current using the following formula:
I = (V /R ) • 1000
BAT
PROG PROG
BATT
VBAT is the connection to the battery. Typically a 1µF Tantalum capacitor is needed for stability
5
when there is no battery attached. When a battery is attached, only a 0.1µF ceramic capacitor is
required.
LP28052A – 01 Version 1.1 Datasheet
FEB.-2012
www.lowpowersemi.com
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