LM3551SD

更新时间： 2024-01-01 21:33:29

品牌	Logo	应用领域
美国国家半导体 - NSC		驱动器闪存
页数	文件大小	规格书
15页	753K
描述
1A White LED Driver with Flash Timeout Protection

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LM3551SD 数据手册

August 2005

LM3551/LM3552

1A White LED Driver with Flash Timeout Protection

General Description

Features

n Up to 1A total drive current

The LM3551 and LM3552 are fixed frequency, current mode

step-up DC/DC converters with two integrated NFETs that

can be used for precision LED brightness control. The de-

vices are capable of driving loads up to 1A from a single-cell

Li-Ion battery.

n Flash timeout protection

n Independent Torch/Flash/Shutdown modes

n LED disconnect in shutdown

n Programmable soft-start limits inrush current

n Over-voltage protection

n Wide voltage range 2.7 to 5.5V

n 1.25MHz constant switching frequency

The LM3551 and LM3552 can drive one or more high current

flash LEDs either in a high power Flash mode or a lower

power Torch mode using the TORCH/FLASH pin. A program-

mable Timeout function on the FTO pin forces the internal

NFETs to turn off after a certain user defined time. An

external SD pin (LM3551) or EN pin (LM3552) is available to

put the device into low power shutdown mode. During shut-

down, the feedback resistors and the load are disconnected

from the input to avoid leakage current paths to ground.

n Small, low profile package, non-pullback LLP14 (4mm x

4mm)

Applications

n White LED Camera Flash

n White LED Torch (Flashlight)

n DSC (Digital Still Camera) Flash

n Cellular Camera Phone Flash

n PDA Camera Flash

User programmable soft-start circuitry has been integrated

to eliminate large inrush currents at start-up. Over-voltage

protection circuitry and a 1.25MHz switching frequency allow

for the use of small, low-cost output capacitors with lower

voltage ratings.

n Camcorder Torch (Flashlight) lamp

The LM3551 and LM3552 are available in a low profile 14 pin

LLP package.

Typical Application Circuits

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与LM3551SD相关器件

型号	品牌	获取价格	描述	数据表
LM3551SD/NOPB	TI	获取价格	1A White LED Driver with Flash Timeout Protection 14-WSON -40 to 85
LM3551SDX	NSC	获取价格	1A White LED Driver with Flash Timeout Protection
LM3551SDX/NOPB	TI	获取价格	1A White LED Driver with Flash Timeout Protection 14-WSON -40 to 85
LM3552	NSC	获取价格	1A White LED Driver with Flash Timeout Protection
LM3552	TI	获取价格	1A White LED Driver with Flash Timeout Protection
LM3552EN	NSC	获取价格	暂无描述
LM3552ENX	NSC	获取价格	IC LED DISPLAY DRIVER, QCC14, 4 X 4 MM, LLP-24, Display Driver
LM3552SD	NSC	获取价格	1A White LED Driver with Flash Timeout Protection
LM3552SD	TI	获取价格	LED DISPLAY DRIVER, QCC14, 4 X 4 MM, LLP-24
LM3552SD/NOPB	TI	获取价格	1A White LED Driver with Flash Timeout Protection 14-WSON -40 to 85