LM2754

更新时间： 2024-09-25 00:04:31

品牌	Logo	应用领域
美国国家半导体 - NSC		驱动器开关闪光灯
页数	文件大小	规格书
11页	1051K
描述
800mA Switched Capacitor Flash LED Driver with Time-Out Protection

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LM2754 数据手册

September 2006

LM2754

800mA Switched Capacitor Flash LED Driver with

Time-Out Protection

General Description

Features

n Up to 800mA Output Current

The LM2754 is an integrated low noise, high current

switched capacitor DC/DC converter with four regulated cur-

rent sinks. The device is optimized for driving 1 to 4 high

power white LEDs in parallel with a maximum current of

800mA. Maximum efficiency is achieved over the input volt-

age range by actively selecting the proper gain based on the

LED forward voltage and current requirements.

n Wide Operating Input Voltage Range: 2.8V to 5.5V

n Drives 1, 2, 3 or 4 LEDs in Parallel

n Ability to Disable One Current Sink Via the SEL Pin to

Accommodate 3-LED Flash Modules

n Time-Out Circuitry Limits Flash Duration to 1 Second

n TX Input Ensures Synchronization with RF Power

Amplifier Pulse

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

n 1MHz Constant Frequency Operation

n Output Current Limit

Two external low power resistors set the desired current for

Torch and Flash modes. The TX pin allows the device to be

forced into Torch mode during a Flash pulse, allowing for

synchronization between the RF power amplifier pulse and

Flash/Torch modes. To protect the device and Flash LEDs,

internal Time-Out circuitry turns off the LM2754 in case of a

faulty prolonged Flash mode. Internal soft-start circuitry lim-

its the amount of inrush current during start-up.

n True Shutdown Output Disconnect

1µA Shutdown Current

n Internal Soft-Start Limits Inrush Current

n No Inductor Required

n Total Solution Size without LED 28mm

The LM2754 is available in a small 24-pin thermally en-

hanced LLP package.

n Low Profile 24-Pin LLP Package (4mm x 4mm x 0.8mm)

Applications

n Camera Flash in Mobile Phones

n Flash for Digital Cameras

n Supplies for DSP’s, Microprocessors, Memory, MP3

Players, Pagers, Other Portable Devices

Typical Application Circuit

20202801

DS202028

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