Preliminary Datasheet

LP28012

LP28012 – 00

Feb.-2014

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Page 2 of 10

Functional Pin Description

Package Type

Pin Configurations

TDFN-10

Pin Description

PIN PIN No.

DESCRIPTION

4,7,9

NC

No Connector.

6

Iset

Charge Current Program, Charge Current Monitor and Shutdown Pin. The charge current is programmed by connecting a 1%

resistor(R

to measure the charge current using the following formula. Iset=1000/Riset.

5,11

GND

VSS is the connection to system ground.

1

Vin

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

10

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.

3

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.

2

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.

8

EN

Chip enable pin. Charging when the pin Voltage is floating and high, discharge when the pin in Low voltage.