LX1993CDU Microsemi Analog Mixed Signal Group, LX1993CDU Datasheet

LX1993CDU

Manufacturer Part Number

LX1993CDU

Description

IC LED DRVR WT/CLR BCKLGT 8-MSOP

Manufacturer

Microsemi Analog Mixed Signal Group

Type

Backlight, White LED, Color LEDr

Datasheet

1.LX1993CDU.pdf (12 pages)

Specifications of LX1993CDU

Constant Current

Yes

Topology

PWM, Step-Up (Boost)

Number Of Outputs

Internal Driver

Yes

Type - Primary

Backlight

Type - Secondary

Color, White LED

Voltage - Supply

1.6 V ~ 6 V

Mounting Type

Surface Mount

Package / Case

8-MSOP, Micro8™, 8-uMAX, 8-uSOP,

Operating Temperature

0°C ~ 70°C

Current - Output / Channel

300mA

Internal Switch(s)

Yes

Efficiency

80%

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Voltage - Output

Frequency

Current page: 1 of 12
Download datasheet (454Kb)

Rev. 1.0b, 2005-03-03

step-up boost converter that features a

psuedo-hysteretic

modulation

white or color LEDs in backlight or

frontlight systems.

maximum efficiency, reduced board

size, and minimal cost, the LX1993 is

ideal for PDA and digital camera

applications. The LX1993 features an

internal N-Channel MOSFET and

control circuitry that is optimized for

portable system design applications.

The LX1993 promotes improved

performance

systems by operating with a quiescent

supply current 70µA (typical) and a

shutdown current of less than 1µA.

The input voltage range is from 1.6V

to 6.0V thus allowing for a broad

selection

applications

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

The LX1993 is a high efficiency

I N T E G R A T E D

topology

and

battery

pulse

Li-Ion

battery-operated

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

Designed for

start-up

for

frequency

D E S C R I P T I O N

voltage

driving

P R O D U C T S

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

ON OFF

guaranteed at 1.6V input.

currents in excess of 300mA and the

output current is readily programmed

using one external current sense

resistor in series with the LEDs. This

configuration provides a feedback

signal to the FB pin thus maintaining

constant output current regardless of

varying LED forward voltage (V

The LX1993 provides an additional

feature for simple dynamic adjustment

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

of the maximum programmed current).

Designers can make this adjustment by

generating an analog reference signal

or a PWM signal applied directly to

the ADJ pin and any PWM amplitude

is readily accommodated via a single

external resistor.

available in the 8-Pin MSOP and thus

requires a very small PCB area.

The LX1993 is capable of switching

number. (i.e. LX1993CDU-TR)

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

0 to 70

Integrated Products Division

(°C)

PACKAGE ORDER INFO

Microsemi

SHDN

ADJ

LX1993

GND

The LX1993 is

OUT

RoHS Compliant / Pb-free

Transition DC: 0432

Plastic MSOP

8-Pin

LX1993CDU

High Efficiency LED Driver

RODUCTION

> 80% Maximum Efficiency

70µA 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

Pagers

Wireless Phones

PDAs

Handheld Computers

LED Driver

Digital Camera Displays

K E Y F E A T U R E S

APPLICATIONS

LX1993

Page 1

Related parts for LX1993CDU

LX1993CDU Summary of contents

Page 1

... Plastic MSOP DU 8-Pin T (°C) A RoHS Compliant / Pb-free Transition DC: 0432 LX1993CDU Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1993CDU-TR) Microsemi Integrated Products Division LX1993 P RODUCTION > 80% Maximum Efficiency 70µA Typical Quiescent Supply Current Externally Programmable Peak ...

Page 2

Supply Voltage (V ) ........................................................................-0.3V to 7.0V IN ...

Page 3

Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C ≤ T otherwise noted and the following test conditions and CS = GND. IN Parameter ...

Page 4

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

Page 5

PERATING HEORY The LX1993 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 ...

Page 6

⎛ ⎞ ⎜ ⎜ ⎟ ⎟ I × PK ⎝ ⎠ C OUT ∆V = DROOP ( V 0.5 − IN The output overshoot can be estimated as ...

Page 7

Pin Name Allowable Range VBAT ...

Page 8

Table 3: Factory Installed Component List for the ...

Page 9

365 340 315 290 265 240 215 190 0 1000 2000 R (Ohms) CS Figure 5: Example of Peak Current versus R Conditions 2. 3.3V ( ...

Page 10

1.40 1.30 1.20 1.10 1. Temperature Figure 11: R DS(on) vs. Temperature Condition 3.0V 145.00 140.00 135.00 130.00 125. Temperature Figure 13: ...

Page 11

8-Pin Miniature Shrink Outline Package (MSOP Note: Dimensions do not include mold flash or protrusions; these shall not exceed 0.155mm(0.006”) on any ...

Page 12

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 ...

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