LM2759

GND

2.2 µF

2.2 µF

4.7 µF

TX

2.2 µF

SDA

SCL

Strobe

TDK: 2.2 µF ± C1608X5R1C225

4.7 µF ± C2012X5R1C475

LM2759

www.ti.com

SNVS577D – JUNE 2008 – REVISED MAY 2013

Check for Samples: LM2759

1

FEATURES

APPLICATIONS

2

•

Up to 1A Output Current

•

Camera Flash in Cellular Phones

•

DESCRIPTION

•

No Inductor Required

LM2759 is an integrated low-noise, high-current

•

90% Peak Efficiency

switched capacitor DC/DC converter with a regulated

•

Adaptive 1x, 1.5x and 2x Gains for Maximum

current source. The device requires only four small

Efficiency

ceramic capacitors making the total solution area less

•

Load Disconnect in Shutdown

LM2759 is capable of driving loads up to 1A from a

•

Accurate Input Current Control During Gain

single-cell Li-Ion battery. Maximum efficiency is

Transitions

achieved over the input voltage range by actively

•

Flash Time-Out

selecting the proper gain based on the LED forward

voltage and current requirements.

•

TX Input Pin Ensures Synchronization with RF

Power Amplifier Pulse

The LED current can be programmed up to 1A via an

•

Torch, Flash, and Indicator Modes

Flash Time-Out durations. One high-current Flash

•

External Flash Enable via Strobe Input Pin

LED can be driven either in a high-power Flash mode

•

or a low-power Torch mode. The Strobe pin allows

the flash to be toggled via a Flash enable signal from

•

Programmable Flash Pulse Duration, and

a camera module. The TX input pin limits the Flash

LED current to the Torch current level during a RF

Interface

PA pulse, to reduce high loads on the battery.

•

1MHz Constant Frequency Operation

Internal soft-start circuitry limits the amount of inrush

•

Low Profile 12–Pin WSON (3mm x 3mm x

current during start-up.

0.8mm)

LM2759 is offered in a small 12-pin thermally

enhanced WSON package.

Typical Application Circuit

1

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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

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PRODUCTION DATA information is current as of publication date.

Copyright © 2008–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.