ltm8042 Linear Technology Corporation, ltm8042 Datasheet

ltm8042

Manufacturer Part Number

ltm8042

Description

Ltm8042/ltm8042-1 - ?module Boost Led Driver And Current Source

Manufacturer

Linear Technology Corporation

Datasheet

1.LTM8042.pdf (32 pages)

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FEATURES

APPLICATIONS

L, LT, LTC, LTM, Linear Technology, the Linear logo and μModule are registered trademarks

and True Color PWM is a trademark of Linear Technology Corporation. All other trademarks are

the property of their respective owners.

TYPICAL APPLICATION

16V TO 26V

True Color PWM™ with 3000:1 Dimming Ratio

Operates in Boost, Buck Mode or Buck-Boost Mode

Wide Input Voltage Range:

Gate Driver for Optional PWM Dimming with

P-channel MOSFET

Adjustable Frequency: 250kHz to 2MHz

Constant-Current and Constant-Voltage Regulation

Low Shutdown Current: <1μA

RoHS Compliant Package with Gold Pad Finish

Tiny, Low Profile (9mm × 15mm × 2.82mm)

Surface Mount LGA Package

Display Backlighting

Automotive and Avionic Lighting

Illumination

Scanners

μModule Boost LED Driver, Driving 8 White LEDs at 1A

Operation from 3V to 30V

Transient Protection to 40V

4.7μF

RUN

BSTIN/BKLED

PWM

SYNC

TGEN

33.2k

LTM8042

= 550kHz

BSTOUT/BKIN

–

GND CTL

LED

4.7μF

UP TO 26.8V

80421 TA01a

DESCRIPTION

The LTM

specifically designed to drive LEDs up to 1A, while the

LTM8042-1 drives up to 350mA. It combines a boost

power topology with a unique current loop to operate as

a constant-current source. The PWM input provides as

much as 3000:1 LED dimming, while 10:1 analog dimming

can be accomplished by a single resistor or analog voltage

applied to the CTL pin. As with any boost topology, the

LTM8042/LTM8042-1 has an uninterrupted current path

between its input and output and is thus intolerant to a

short-circuit or overload from the output to ground.

The LTM8042/LTM8042-1 is packaged in a thermally

enhanced, compact overmolded land grid array (LGA)

package. The LTM8042/LTM8042-1 is Pb-free and a RoHS

compliant.

# WHITE LEDS

µModule Boost LED Driver

8042 is a complete μModule

and Current Source

LTM8042/LTM8042-1

LED CURRENT

350mA

Efficiency vs V

(V)

LTM8042-1

LTM8042

12V

80421 TA01b

Boost LED Driver

LTM8042-1

LTM8042

24V

80421fa

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