LX1918CLD MICROSEMI [Microsemi Corporation], LX1918CLD Datasheet

LX1918CLD

Manufacturer Part Number

LX1918CLD

Description

1.8A Step-Down Synchronous Converter

Manufacturer

MICROSEMI [Microsemi Corporation]

Datasheet

1.LX1918CLD.pdf (9 pages)

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Meier Automation Equipment Co., Limited

Part Number:

LX1918CLD

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Bonase Electronics (HK) Co., Limited

Part Number:

LX1918CLD-TR

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MSC

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Rev. 1.1, 2005-07-05

down

synchronous rectifier. All MOSFET

switches and compensation com-

ponents are built in. The synchronous

rectification eliminates the need of an

external

maximizes efficiency (>95%) for a

high step-down ratio and a low output

voltage. The input supply voltage

range is from 2.7V to 5.5V with a

maximum output current of 1.8A.

PWM with optional PFM under light

loads. The LX1918 can switch with a

1MHz free running internal oscillator

or be synchronized with an external

oscillator ranging from 500KHz to

1.25MHz; the high frequency allows

for small size and low cost external

components. The LX1918 output

voltage is programmable with two

resistors and can be tightly regulated

down to 0.6V.

IMPORTANT: For the most current data, consult MICROSEMI’s website:

The Microsemi LX1918 is a step

The LX1918 is a current mode

buck

Schottky

ON OFF

regulator

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

diode

D E S C R I P T I O N

with

and

VCC

MODE

E/S

either maximize efficiency or reduce

EMI depending on the needs of the

application. High efficiency (MODE =

GND) is obtained by allowing the

LX1918 to enter a PFM mode with

discontinuous inductor current. Low

EMI (MODE=VCC) is obtained by

only operating in PWM mode even at

no load.

start, cycle-by-cycle switch current

limit, hiccup short circuit current

limiting and thermal shut down.

MLP package (fully RoHS compliant).

LX1918

“TR” to the part number.(i.e. LX1918CLD-TR)

PGND

Note: Available in Tape & Reel. Append the letters

The LX1918 MODE feature can

The LX1918 features include soft

The LX1918 comes in small 8 pin

P R O D U C T H I G H L I G H T

-40 to 85

P A C K A G E O R D E R I N F O

PWR

Integrated Products Division

SGND

(°C)

Microsemi

http://www.microsemi.com

RoHS Compliant / Pb-free

1.8A Step-Down Synchronous Converter

LX1918CLD

Plastic MLP

8-Pin 3x3mm

RODUCTION

Input range voltage 2.7 to 5.5V

Maximum output current, 1.8A

Internal or External

Synchronization

Output Voltage from V

PFM or PWM mode under light

load

EMI support with force PWM

mode

Efficiency up to 95%

No external Schottky diode

Thermal shutdown

Cycle by cycle switch current

limit

UVLO

Short circuit protection

8 pin MLP

Lower power embedded

applications

WLAN power system

Portable design with single cell

Lion or 3 cells NiMH/NiCd

Low power portable storage

application

ATA

K E Y F E A T U R E S

OUT

A P P L I C A T I O N S

@ 1.8 A

HEET

LX1918

to 0.6V

Page 1

Related parts for LX1918CLD

LX1918CLD Summary of contents

Page 1

... Plastic MLP LD T (°C) 8-Pin 3x3mm A RoHS Compliant / Pb-free - LX1918CLD Note: Available in Tape & Reel. Append the letters “TR” to the part number.(i.e. LX1918CLD-TR) Microsemi Integrated Products Division LX1918 RODUCTION ATA HEET Input range voltage 2 ...

Page 2

Supply Input Voltage (PWR, VCC)..................................................-0.3V to 6.5V Supply Input Transient Voltage (PWR, VCC).................................................10V Input Voltage (E/S, FB,MODE) ...

Page 3

TM Unless otherwise specified, the following specifications apply over the operating ambient temperature where otherwise noted and the following test conditions: V Parameter ENTIRE REGULATOR 3 Input Voltage 1 Efficiency Quiescent Current Active • Shutdown • 1 Line Regulation 1 ...

Page 4

Page 5

2.7 to 5.5V IN 4.7µF 0.1µF ON OFF Figure 2 – Typical Application: Highest Light Load Efficiency Mode During Light Load With Internal 1MHz PWM Frequency V = 2.7 to 5.5V IN 4.7µF 0.1µF 500kHz Figure 3 ...

Page 6

TM LX1918 is synchronous step down converter with input voltage range from 2.7V to 5.5V; and outputs ranging from 0. The LX1918 can deliver a maximum IN output current up to 1.8A. The LX1918 has ...

Page 7

100% 90% 80% 70% 60% 50% 40% 30% 20% 10 100 Output Current (mA ...

Page 8

Pin Plastic MLP Dual Exposed Pad top A side e A1 Copyright © 2004 Rev. 1.1, 2005-07-05 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 ® 1.8A Step-Down Synchronous Converter P A ...

Page 9

TM PRODUCTION DATA – Information contained in this document is proprietary to Microsemi and is current as of publication date. This document may not be modified in any way without the express written consent of Microsemi. Product processing does not ...

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