Preliminary

Datasheet

LP28292

LP28292 – 02 Ver. 1.2 Datasheet

Nov.-2008

Page 2 of 10

Functional Pin Description

P a ckag e Ty pe

Pin Con f igurat i o ns

TDFN- 10

10

NC

3

VIN

NC

1

NC

NC

4

STAT

6

ISET

5

VOUT

NC

7

VSS

8

29

Pi n Desc ript io n

PIN

PIN

Number

DESCRIPTION

VIN

1,2

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

STAT

3

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, a weak pull-down of

approximately 20µA is connected to the STAT pin, indicating an “AC present” condition. When

the LP28292 detects an under voltage lockout condition, STAT is forced high impedance.

NC

4,7

No connector.

VSS

5,11

VSS is the connection to system ground.

ISET

9

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

grammed by connecting a 1% resistor(R

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

) • 880

VOUT/TS

9

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. A vision the pin is Vout,B vision the pin is TS.

VOUT

10

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.