LX7167 datasheet(1/12 Pages) MICROSEMI

Part #	LX7167

Description	3MHz, 2.4A Step Down Converter

PDF	12 Pages

Scroll/Zoom	100%

Manufacturer	MICROSEMI [Microsemi Corporation]

Direct Link	http://www.microsemi.com

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1 / 12 page

Aug 2013 Rev. 1.1

www.microsemi.com

1

3MHz, 2.4A

Step Down Converter

VOUT

R1

1%

R2

1%

PGOOD

COUT

0.68µF

100k

PVIN

EN

PG

SW

PGND

FB

GND

LX7167

VIN

CIN

8

5

3

1

4

2

6

VCC

7

C9

Figure 1 · Typical Application of LX7167

Features

 2.4A Step-down Regulator

 Operational Input Supply Voltage Range:

3V-5.5V

 Integrated PMOS and NMOS

 Load Current from Zero to 2.4A

 3MHz Switching Frequency

 SKIP Pulse to Improve Light Load

Efficiency

 Input UVLO and OV Protection

 Enable Pin

 Power Good

 Internal Soft-start

 Cycle-by-Cycle Over Current Protection

 Hiccup Mode Operation Under FB UVLO

 RoHS Compliant for Pb Free

Applications

 HDD

 Set-Top Box



LCD TV’s

 Notebook/Netbook

 Routers

 Video Cards

 PC Peripherals

 PoE Powered Devices Smart Phone

Description

LX7167 is a step-down PWM Switching Regulator

IC with integrated high side P-CH and low side N-

CH MOSFETs. The IC operates using a hysteretic

control topology with a full load operating switching

frequency of 3MHz allowing small output filter

components while maintaining excellent dynamic

load response.

The operational input voltage range of LX7167 is

from 3V to 5.5V. The part has a Power Save Mode

(PSM) that automatically transitions between PWM

and PSM mode depending on the load current. This

allows the converter’s efficiency to remain high

when load current drops. There is a Power Good

function to indicate the status of the IC.

In the shutdown mode, the IC’s current consumption

is reduced to less than 1µA and the output capacitor

is discharged.

Other features of the part are: a) Cycle-by-cycle

current limit followed by HICCUP mode which

reduces the overall power dissipation of the internal

MOSFETs, b) thermal protection and internal digital

soft start.

The LX7167 is available in a 2mm x 2mm 8 pin

exposed pad DFN package.

LX7167

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Microsemi Corporation	LX7165	1Mb / 24P	3V to 5.5V, 5A Constant Frequency Hysteretic Synchronous Buck Regulator with I2C Rev. 1.2
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