LM2758TLSLASHNOPB中文资料德州仪器数据手册PDF规格书

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, highcurrent

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 timeout

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.