Preliminary Datasheet

LP6343

LP6343 –00 Version 1.0 Datasheet

Feb.-2010

www.lowpowersemi.com

Page 1 of 12

1.5MHz,

3A Step-down Converter With Soft-Start

General Description

The LP6343 contains a independent 1.5MHz constant

frequency, current mode, PWM step-down converters.

The converter integrates a main switch and a

synchronous rectifier for high efficiency without an

external Schottky diode. The LP6343 is ideal for

powering portable equipment that runs from a single cell

Lithium-Ion (Li+) battery. The converter can supply

3000mA of load current from a 2.5V to 5.5V input

voltage. The output voltage can be regulated as low as

0.6V. The LP6343 can also run at 100% duty cycle for

low dropout applications.

The LP6343 is available in a 10-lead 3mm*3mm TDFN-10

and EMSOP-10 package and is rated over the -40°C to

85°C temperature range.

Order Information

LP6343□

□ □

□

F: Pb-Free

Package Type

QV: TDFN-10

MS: MSOP-10(E)

Output type

A: Adjustable

Typical Application Circuit

Features

Input Voltage Range: 2.5V to 5.5V

Output Voltage Range: 0.6V to VIN

3000mA Load Current on Channel

Up to 95% Efficiency

100% Duty Cycle in Dropout

< 1 u A Quiescent Current

1.5MHz Switching Frequency

Soft star Function

Short Circuit Protection

Current Mode Operation

Thermal Fault Protection

3 m m × 3 m m TDFN-10 or MSOP-10 Package

RoHS Compliant and 100% Lead (Pb)-Free

Applications

Portable Media Players

Cellular and Smart mobile phone

PDA/DSC

GPS Applications

Marking Information

Please see website. www.lowpowersemi.com

R1

45K

LP6343AQVF

1

7

5

2

3

8

4

EN

SW

FB

Vin

Vin

SW

PGOOD

Vout=(R1/R2+1)*0.6V

22uF*2

2.2uH

22uF

3.3V/3A

22pF

VIN_5V

R2

10K