LX1742 Datasheet

IC型號(hào)：
LX1742
PDF描述：
High Efficiency High Voltage Boost Controller
文件大?。?/label>
456.61KB
PDF頁(yè)數(shù)：
13頁(yè)
芯片廠家：
MICROSEMI

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LX1742

I N T E G R A T E D

P R O D U C T S

High Efficiency High Voltage Boost Controller

RODUCTION

ATA

HEET

DESCRIPTION

KEY FEATURES

WWW .

Microsemi

The LX1742 is a compact high

efficiency step-up boost controller.

Featuring a pseudo-hysteretic pulse

frequency modulation topology, the

LX1742 was designed for maximum

efficiency, reduced board size, and

minimal cost.

Utilizing an internal N-Channel

MOSFET,

the

LX1742

offers

designers maximum flexibility with

respect to efficiency and cost. The

LX1742 provides several design

enhancements that improve overall

performance under very light load

currents by implementing control

circuitry that is optimized for portable

systems - thus providing a quiescent

supply current of only 80碌A(chǔ) (typ) and

a shutdown current of less than 1碌A(chǔ).

The input voltage ranges from 1.6V to

6.0V, allowing for a wide selection of

system battery voltages. Start-up

operation is guaranteed at 1.6V input

The LX1742 is capable of achieving

output voltages as high as 25V and the

output voltage is easily programmed

using two external resistors in

conjunction with the feedback pin.

The LX1742 has an additional feature

for simple dynamic adjustment of the

output voltage (i.e., up to

鹵15%

of the

nominal output voltage).

Voltage

adjustment is achieved via an analog

reference signal or a direct PWM input

signal applied to the ADJ pin. Any

PWM

amplitude

easily

accommodated with a single external

resistor.

80% Typical Efficiency

80碌A(chǔ) Typical Quiescent Supply

Current

Externally Programmable Peak

Inductor Current Limit For

Maximum Efficiency

Logic Controlled Shutdown

< 1.0 碌A(chǔ) Shutdown Current (typ)

Dynamic Output Voltage

Adjustment Via Analog

Reference Or Direct PWM Input

8-Pin MSOP Package

APPLICATIONS/BENEFITS

Pagers

Wireless Phones

PDAs

Handheld Computers

General LCD Bias Applications

LED Driver

IMPORTANT:

For the most current data, consult

MICROSEMI鈥檚

website:

http://www.microsemi.com

PRODUCT HIGHLIGHT

BAT

= (1.6V to 6.0V)

47碌H

UPS530

SHDN

OUT

1nF

1M鈩?/div>

(For Contrast Adjustment)

OUT

= 18V 鹵 15%

LX1742

ADJ

GND

4.7碌F

1k鈩?/div>

72k鈩?/div>

PWM

625k鈩?/div>

100kHz

PWM

= 3.0V

PACKAGE ORDER INFO

Plastic MSOP

8-Pin

(擄C)

0 to 70

LX1742CDU

LX1742

RoHS Compliant / Pb-free

Transition DC: 0432

Note: Available in Tape & Reel. Append the letters 鈥淭R鈥?to the

part number. (i.e. LX1742CDU-TR)

漏

2000

Rev. 1.0b, 2005-03-03

Microsemi

Integrated Products Division

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

Page 1

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