Preliminary Datasheet

LP28300

LP28300 – 01 Version

1.1 Datasheet

Sep.-2010

www.lowpowersemi.com

Page 2 of 10

Functional Pin Description

Package Ty pe

Pin Configurations

TDFN- 10

VIN

7

LP28300

VIN

6

SNS

3

11

8

1

GND

10

9

4

2

BATT

EN

SW

NC

STAT

PGND

5

TS

Pin Description

PIN

PIN

Number

DESCRIPTION

VIN

1,7

4V to 5.5V for normal operation. Operation down to the under-voltage lockout threshold is allowed

with current limited wall adapters. Decouple with a 10µF or larger surface mounted ceramic capacitor.

TS

2

NTC (Negative Temperature Coefficient) Thermistor Input. With an external 10kΩ NTC thermistor to

ground, this pin senses the temperature of the battery pack and stops the charger when the temperature

is out of range. To disable the temperature qualification function, ground the NTC pin.

EN

3

Enable Input Pin. Pulling the EN pin high places the LP28300 into a low power state where the BAT

drain current drops to less than 3µA and the supply current is reduced to less than 50µA. For normal

operation, pull the pin low.

STAT

4

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, When the LP28300 detects an

under voltage lockout condition, STAT is forced high impedance.

BATT

5

Battery Charger Output Terminal. Connect a 22µF ceramic chip capacitor between BAT and PGND to

keep the ripple voltage small.

SNS

6

Internal Sense Resistor. Connect to external inductor.

NC

8

No connector.

SW

9

Switch Node Connection. This pin connects to the drains of the internal main and synchronous power

MOSFET switches. Connect to external inductor.

GND

10

Ground.

PGND

11

Power Ground Pad.