LX1995

Microsemi

Integrated Products Division

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

Page 1

Miniature LED Driver

Copyright

© 2000

Rev. 1.1, 2005-07-07

TM

®

DESCRI PTI O N

The Microsemi LX1995-x is a

miniature LED driver with integrated

drivers. It is designed to drive white

or color LEDs in portable display

applications.

The LX1995-x is an

adjustable step-up boost converter.

The LX1995-x can switch up to 2MHz

allowing designers to use a low cost,

small inductor and filter capacitor.

The driver supports a wide input

voltage range (1.6V to 5.5V) with

efficiency greater than 85% and can

start up at 1.6V input. The LX1995-x

is a low cost, high efficiency LED

driver.

The design is based on a

pseudo-hysteretic

pulse

frequency

modulation topology.

In portable

battery applications the LX1995-x

offers high system efficiency with low

The LX1995-x output current is

programmable using an external current

sense resistor in series with LEDs. This

configuration provides a feedback to the

FB pin which maintains constant output

current independent of input voltage

and LED forward voltage (VF). LED

dimming is accomplished using a PWM

signal or varying DC voltage methods.

The LX1995-x is available in the 5-

Pin TSOT and SOT-23 package. The

LX1995-1 can drive up to 6 LEDs

(switching current is 325mA).

The

LX1995-2 can drive up to 10 LEDs

(switching current is 500mA).

KEY FEATUR ES

< 1µA Shutdown Current

> 85% Maximum Efficiency

Efficient at Low Current Levels

< 70µA Quiescent Supply

Current in Operating Mode

Logic Controlled Shutdown

Dimming Options: PWM or

Varying DC Voltage

Tiny 5-Pin TSOT Package

Smallest External Components

APPLI C ATION S

Pagers

Wireless Phones

PDAs

LED Driver

Digital Camera Displays

GPS Receivers

PRODUCT H I GHLIGHT

LX1995

ON OFF

V

IN

SHDN

GND

FB

SW

PACKAGE ORDER I N FO

SG

Plastic TSOT

5-Pin

SE

Plastic SOT-23

5-Pin

°C)

Switch

Current

RoHS Compliant / Pb-free

RoHS Compliant / Pb-free Transition DC: 0503

-40 to 85

325mA

LX1995-1CSG

LX1995-1CSE

-40 to 85

500mA

LX1995-2CSG

LX1995-2CSE

Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1995-1CSG-TR)