LX1992CLM Microsemi Analog Mixed Signal Group, LX1992CLM Datasheet

LX1992CLM

Manufacturer Part Number

LX1992CLM

Description

IC LED DRIVR WT/CLR BCKLGT 8-MLP

Manufacturer

Microsemi Analog Mixed Signal Group

Type

Backlight, White LED, Color LEDr

Datasheet

1.LX1992CLM.pdf (11 pages)

Specifications of LX1992CLM

Constant Current

Yes

Topology

PWM, Step-Up (Boost)

Number Of Outputs

Internal Driver

Type - Primary

Backlight

Type - Secondary

Color, White LED

Voltage - Supply

1.6 V ~ 6 V

Mounting Type

Surface Mount

Package / Case

8-MLP

Operating Temperature

0°C ~ 70°C

Current - Output / Channel

50mA

Internal Switch(s)

Yes

Efficiency

90%

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Voltage - Output

Frequency

Current page: 1 of 11
Download datasheet (326Kb)

Rev. 1.1b, 2005-03-03

efficiency step-up boost controller for

driving white or color LEDs in

backlight or frontlight systems and

offers designers maximum flexibility

with respect to efficiency and cost.

The LX1992 features a pseudo-

hysteretic pulse frequency modulation

topology and uses an external N-

Channel MOSFET.

LX1992 features control circuitry that

is optimized for portable systems (e.g.,

quiescent supply current of 80µA

(typ) and a shutdown current of less

than

enhancements provide for improved

performance

systems applications.

from 1.6V to 6.0, allowing for a wide

selection of system battery voltages

and

guaranteed at 1.6V input.

IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com

The LX1992 is a compact high

The device input voltage range is

1µA).

start-up

battery

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

These

operation

LED

Further, the

BAT

= 3.6V typ.

= 20mA to 0mA

= 1.6V to 6.0V

D E S C R I P T I O N

operated

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

design

0 to 70

LX1992CDU-TR)

O N O FF

(°C)

readily achieved by using one external

current sense resistor in series with the

LEDs.

current provides a feedback signal to the

FB pin, maintaining constant current

regardless of varying LED forward

voltage (V

capable of achieving output currents in

excess of 150mA, depending on the

MOSFET selected.

for simple dynamic adjustment of the

output current (i.e., up to 100% of the

maximum

Designers can make this adjustment via

an analog reference signal or a direct

PWM generated signal applied to the

ADJ pin and any PWM amplitude is

easily accommodated with a single

external resistor.

Pin MSOP, and the miniature 8-Pin MLP

requiring minimal PCB area.

Programming the output current is

The LX1992 has an additional feature

The LX1992 is available in both the 8-

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

Linfinity Microelectronics Division

PACKAGE ORDER INFO

RoHS Compliant / Pb-free

In this configuration, LED

SHD N

ADJ

). Moreover, the LX1992 is

Transition DC: 0452

Microsemi

LX1992

1206 C ase Size

LX1992CLM

programmed

G N D

Plastic MLP

8-Pin

DR V

SR C

C S

Ω

current).

High Efficiency LED Driver

RoHS Compliant / Pb-free

Transition DC: 0432

RODUCTION

LX1992CDU

Plastic MSOP

8-Pin

4.7

> 90% Efficiency

80µA Typical Quiescent Supply

Current

Externally Programmable Peak

Inductor Current Limit For

Maximum Efficiency

Logic Controlled Shutdown

< 1µA Shutdown Current

Dynamic Output Current

Adjustment Via Analog

Reference Or Direct PWM Input

8-Pin MSOP Package or 8-Pin

MLP

Pagers

Wireless Phones

PDAs

Handheld Computers

General LCD Bias Applications

LED Driver

Digital Camera Displays

APPLICATIONS/BENEFITS

ATA

1 5 Ω

K E Y F E A T U R E S

SET

HEET

LX1992

Page 1

Related parts for LX1992CLM

LX1992CLM Summary of contents

Page 1

... ADJ Ω PACKAGE ORDER INFO Plastic MLP LM 8-Pin T (°C) A RoHS Compliant / Pb-free Transition DC: 0452 LX1992CLM LX1992CDU-TR) Microsemi Linfinity Microelectronics Division LX1992 RODUCTION ATA HEET > 90% Efficiency 80µA Typical Quiescent Supply Current Externally Programmable Peak Inductor Current Limit For Maximum Efficiency Logic Controlled Shutdown < ...

Page 2

Supply Voltage (V ) ........................................................................-0.3V to 7.0V IN Feedback Input Voltage (V ) ................................................-0. ...

Page 3

TM Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C otherwise noted and the following test conditions: V Parameter Operating Voltage Minimum Start-up Voltage Start-up Voltage Temperature Coefficient Quiescent Current FB Threshold Voltage FB Input Bias ...

Page 4

TM Typical LED Driver Applications V = 1.6V to 6.0V BAT ON OFF V = 3.6V typ 0mA to 20mA LED Figure 1 – LED Driver with Full-Range Dimming Via PWM Input V = 1.6V to 6.0V ...

Page 5

PERATING HEORY The LX1992 is a PFM boost converter that is optimized for driving a string of series connected LEDs. It operates in a pseudo-hysteretic mode with a fixed switch “off time” of 300ns. Converter switching is ...

Page 6

TM formula for ∆V is: DROOP ⎛ ⎞ L ⎜ ⎜ ⎟ ⎟ × PK ⎝ ⎠ C OUT ∆ DROOP V 0.5 − IN The output overshoot can be estimated as follows where the 0.5 ...

Page 7

Pin Name Allowable Range VBAT VCC 1. VPOT 1. VADJ ...

Page 8

Table 3: Factory Installed Component List for the LX1992 Evaluation Board Part Quantity Reference 1 Q1 Mosfet, ...

Page 9

TM Figure 5: V and Inductor Current Waveforms. OUT Channel 1: V (AC coupled; 200mV/div) OUT Channel 2: Inductor Current (100mA/div.) Configuration 3.0V 13.0V OUT ...

Page 10

Page 11

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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