LX1744CPW Microsemi Analog Mixed Signal Group, LX1744CPW Datasheet

LX1744CPW

Manufacturer Part Number

LX1744CPW

Description

IC LED DRVR WT/CLR BCKLT 14TSSOP

Manufacturer

Microsemi Analog Mixed Signal Group

Type

Backlight, White LED, Color LEDr

Datasheet

1.LX1744CPW.pdf (16 pages)

Specifications of LX1744CPW

Constant Current

Yes

Topology

PWM, Step-Up (Boost)

Number Of Outputs

Internal Driver

Both

Type - Primary

Backlight

Type - Secondary

Color, White LED

Voltage - Supply

1.6 V ~ 6 V

Voltage - Output

25V

Mounting Type

Surface Mount

Package / Case

14-TSSOP

Operating Temperature

-40°C ~ 85°C

Current - Output / Channel

100mA

Internal Switch(s)

Yes

Efficiency

90%

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Frequency

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LX1744CPW

Manufacturer:

Microsemi Analog Mixed Signal

Quantity:

135

Current page: 1 of 16
Download datasheet (572Kb)

Rev. 1.1b, 2005-03-01

efficiency step-up boost regulator for

driving white or color LEDs in LCD

lighting applications while supplying the

necessary LCD bias voltage with an

additional integrated boost converter.

featuring

topology (that decreases output voltage

ripple), the LX1744 minimizes system cost

and condenses layout area making it ideal

for PDA, smart-phone, and digital camera

applications.

implemented using an internal N-Channel

MOSFET, the LED driver utilizes an

external N-Channel MOSFET in order to

maintain maximum efficiency along with

flexible power requirements.

optimized for portable systems with a

shutdown current of less than 1µA. The

input voltage range of 1.6V to 6.0V allows

for a wide selection of system battery

voltages and start-up is guaranteed at a V

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

The LX1744 is a compact high

Designed for maximum efficiency and

While the LCD Bias generation is

The LX1744’s control circuitry is

LCD1

LCD2

I N T E G R A T E D

= V

to 25V

- V

to 25V

BAT

psuedo-hysteretic

LCD

= 1.6V to 6.0V

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

D E S C R I P T I O N

-40 to 85

P R O D U C T S

PFM

(°C)

SW1

FB1

SW2

REF

FB2

GND

SHDN2

Append the letters “TR” to the part number. (i.e. LX1744CLQ-TR)

1206 Case Size

LX1744

47µH

equal to 1.6V with sustained operation as

low as 1.1V.

easily programmed using one external

current sense resistor in series with the

LEDs. In this configuration, LED current

provides a feedback signal to the FB pin,

maintaining constant current regardless of

varying

Depending on the MOSFET selected, the

LX1744 is capable of achieving an LED

drive in excess of 1.0W.

adjustment of the LED drive current (0% to

100% full range dimming) and the LCD

Bias output voltage (up to ±15% typ)

through separate IC interfaces.

interface has an internal RC filter allowing

designers to make these adjustments via a

direct PWM input signal or an analog

reference signal.

amplitude is easily accommodated using a

single external resistor.

TSSOP, and the miniature 16-Pin MLP

requiring minimal PCB area.

LSHDN

SHDN1

ADJ2

ADJ1

DRV

SRC

OVP

BRT

LFB

The maximum LED drive current is

The LX1744 provides simple dynamic

The LX1744 is available in the 14-Pin

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

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

RoHS Compliant / Pb-free

Integrated Products Division

ON OFF

Transition DC: 0442

LED

Note: Available in Tape & Reel.

LX1744CPW

Microsemi

http://www.microsemi.com

Plastic TSSOP

14-Pin

forward

LED

4.7µF

= 20mA to 0mA

Further, any PWM

Dual Output Boost – LED Driver / LCD Bias

15Ω

SET

voltage

RoHS Compliant / Pb-free

Each

Transition DC: 0430

RODUCTION

LX1744CLQ

Plastic MLP-Q

16-Pin

LX1744 Evaluation Board

> 90% Maximum Efficiency

Low Quiescent Supply Current

Externally Programmable Peak

Inductor Current Limit for

Maximum Efficiency

Logic Controlled Shutdown

< 1µA Shutdown Current

Dynamic Output LED Current

and LCD Bias Voltage

Adjustment via Analog

Reference or Direct PWM Input

14-Pin TSSOP or 16-Pin MLPQ

Package

Pagers

Smart Phones

PDAs

Handheld Computers

General LCD Bias Applications

LED Driver

K E Y F E A T U R E S

ATASHEET

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

LX1744

Page 1

Related parts for LX1744CPW

LX1744CPW Summary of contents

Page 1

... ADJ2 ON OFF Plastic TSSOP PW LQ 14-Pin (°C) RoHS Compliant / Pb-free RoHS Compliant / Pb-free Transition DC: 0442 LX1744CPW Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1744CLQ-TR) Microsemi Integrated Products Division LX1744 P D RODUCTION ATASHEET > 90% Maximum Efficiency ...

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...

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Name Unregulated IC Supply Voltage Input – Input range from +1.6V to 6.0V. Bypass with a 1µF or greater capacitor IN for ...

Page 4

Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C otherwise noted and the following test conditions: V Parameter ...

Page 5

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1.6V to 6.0V BAT - V LCD 25V LCD IN Figure 1 – LED Driver with ...

Page 7

UNCTIONAL ESCRIPTION The LX1744 is a dual output Pulse Frequency Modulated (PFM) boost converter that is optimized for large step-up ...

Page 8

less than 100kHz, an external filter capacitor will be needed (Figure 5). The value of C based on the PWM frequency and ...

Page 9

negative voltage transition that is greater than the output voltage OWER OSFET ELECTION The LX1744 can source up to ...

Page 10

LCD B G EGATIVE IAS ENERATION For applications that require it, a negative bias can be easily generated using an inductorless ...

Page 11

Input/Output Name Range VIN GNDx 0V ADJ 0 to VIN-100mV SHDN 0 to VIN SHDN VLCD ≤25V -VLCD ≥-25V ...

Page 12

... RESISTOR, 100K, POT, 1/16W, 0805 R9, R10 RESISTOR, 100K, 1/16W, 0805 R11, R12, R13 RESISTOR, 10K, 1/16W, 0805 U1 Microsemi LX1744CPW BOOST CONTROLLER Notes 1. Use these locations to insert additional input and/or output capacitance. Copyright © 2000 Rev. 1.1b, 2005-03-01 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Dual Output Boost – ...

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LX1744CPW Microsemi Analog Mixed Signal Group, LX1744CPW Datasheet

LX1744CPW

Specifications of LX1744CPW

Available stocks

Related parts for LX1744CPW

LX1744CPW Summary of contents

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