Description
LM3551/LM3552 1A White LED Driver with Flash Timeout Protection August 2005 LM3551/LM3552 1A White LED Driver with Flash Timeout Protection General .
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 brightne.
Features
* n n n n n n n n n Up to 1A total drive current Flash timeout protection Independent Torch/Flash/Shutdown modes LED disconnect in shutdown Programmable soft-start limits inrush current Over-voltage protection Wide voltage range 2.7 to 5.5V 1.25MHz constant switching frequency Small, low profile packa
Applications
* n n n n n n White LED Camera Flash White LED Torch (Flashlight) DSC (Digital Still Camera) Flash Cellular Camera Phone Flash PDA Camera Flash Camcorder Torch (Flashlight) lamp
Typical Application Circuits
20151205
© 2005 National Semiconductor Corporation
DS201512
www. national. com
LM3551/LM355