LM2758

October 9, 2009

Switched Capacitor Flash LED Driver in micro SMD

General Description

LM2758 is an integrated low-noise, high-current switched ca-

pacitor DC/DC converter with a regulated current sink. The

device is capable of driving loads up to 700 mA from a single-

cell Li-Ion battery. Maximum efficiency is achieved over the

input voltage range by actively selecting the proper gain

based on the LED forward voltage and current requirements.

One external low-power resistor sets the desired current for

Indicator, Torch and Flash modes. To protect the devices and

the flash LED, internal Time-out circuitry turns off the LM2758

in case of a faulty prolonged Flash mode. Internal soft-start

circuitry limits the amount of inrush current during start-up.

LM2758 is offered in National’s tiny 12-bump thin micro SMD

package.

Features

—No Inductor, Only 4 Capacitors and a resistor Required

—1.514 mm x 1.996 mm x 0.6 mm thin micro SMD

package

(typ.)

Applications

Typical Application Circuit

30045301

© 2009 National Semiconductor Corporation

300453

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