Preliminary Datasheet

LP28052A

LP28052A – 01 Version 1.1 Datasheet

FEB.-2012

www.lowpowersemi.com

Page 2 of 9

Functional Pin Description

P a ckag e Ty pe

Pin Con f igurat i o ns

SOP-8(P)

VIN

ISET

4

7

BATT

1

6

NC

8

NC

STAT

2

PGND

VSS

NC

5

9

3

Pi n Desc ript io n

PIN

PIN

Number

DESCRIPTION

VIN

4

VIN is the input power source. Connect to a wall adapter.

STAT

7

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.

NC

1,6,8

No connector.

VSS/PGND

3,9

VSS is the connection to system ground.

ISET

2

Charge Current Program, Charge Current Monitor and Shutdown Pin. The charge current is pro-

grammed by connecting a 1% resistor(R

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

BAT

= (V

PROG

/R

PROG

) • 1000

BATT

5

VBAT is the connection to the battery. Typically a 1µF Tantalum capacitor is needed for stability

when there is no battery attached. When a battery is attached, only a 0.1µF ceramic capacitor is

required.