LM2758

RSET

ISET

PGND SGND

EN1

EN2

VIN

C1

+

C2

+

C2

-

C1

-

CPOUT

LED-

+

-

2.7 V to 5.5 V

C2

C1

CIN

COUT

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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

LM2758

SNVS551E – APRIL 2008 – REVISED MAY 2016

LM2758 Switched Capacitor Flash LED Driver in DSBGA Package

1

1 Features

1

•

Up to 700-mA Output Current

•

90% Peak Efficiency

•

Indicator, Torch, and Flash Modes

•

Time-Out Circuitry Limits Flash Duration to 814

Milliseconds (Typical)

•

Adaptive 1× and 1.5× Gains for Maximum

Efficiency

•

True Shutdown

•

Internal Soft-Start Eliminates Inrush Current

•

Ultra-Small Solution Size

–

No Inductor, Only 4 Capacitors and a Resistor

Required

–

2.022 mm × 1.527 mm × 0.6 mm Thin DSBGA

package

2 Applications

•

Camera Flash in Mobile Phones

•

Flash for Digital Cameras

3 Description

The LM2758 device is an integrated low-noise, high-

current switched capacitor 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.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (MAX)

LM2758

DSBGA (12)

2.022 mm × 1.527 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Typical Application Circuit