LM3552EN

更新时间： 2024-11-15 13:00:23

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
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LM3552EN 数据手册

February 2006

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

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

4mm)

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.

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

20151205

DS201512

www.national.com

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与LM3552EN相关器件

型号	品牌	获取价格	描述	数据表
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
LM3552SDX	NSC	获取价格	1A White LED Driver with Flash Timeout Protection
LM3552SDX/NOPB	TI	获取价格	1A White LED Driver with Flash Timeout Protection 14-WSON -40 to 85
LM3553	NSC	获取价格	1.2A Dual Flash LED Driver System with I2C Compatible
LM3553	TI	获取价格	具有 I2C 兼容接口的 1.2A 双闪存 LED 驱动器系统
LM3553SD/NOPB	TI	获取价格	具有 I2C 兼容接口的 1.2A 双闪存 LED 驱动器系统 \| DQB \| 12 \|
LM3553SD-/NOPB	NSC	获取价格	IC LED DISPLAY DRIVER, DSO12, 3 X 3 MM, 0.80 MM HEIGHT, 0.40 MM PITCH, LEAD FREE, HALOGEN