LM3551 Datasheet (National Semiconductor)

LM3551, 1A White LED Driver

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 devices are capable of driving loads up to 1A from a single-cell Li-Ion battery.

The LM3551 and LM3552 can drive one or more high curr

LM3551 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