Preliminary Datasheet

LP28056

LP28056 – 01 Ver. 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)

LP28056

1

2

3

45

6

7

8

9

PGND

NC

NC

VSS

STAT1

BATT

ISET

VIN

STAT2

Pi n Desc ript io n

PIN

PIN

Number

DESCRIPTION

1,8

NC

No Connector.

2

Iset

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

by connecting a 1% resistor(R

1V. In all modes, the voltage on this pin can be used to measure the charge current using the following

formula.

3

VSS

VSS is the connection to system ground.

4

Vin

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

5

BATT

BAT is the connection to the battery. Typically a 10µF 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.

6

STAT2

Open-Drain Charge Status Output. When the battery is charging, the STAT pin is pulled High by an

internal N-channel MOSFET. When the charge cycle is completed, the pin is pulled Low.

7

STAT1

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.