LM3552SD ,1A White LED Driver with Flash Timeout ProtectionFeaturesn Up to 1A total drive currentThe LM3551 and LM3552 are fixed frequency, current modestep-u ..
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LM3551SD-LM3552SD-LM3552SDX
1A White LED Driver with Flash Timeout Protection
LM3551/LM3552 White LED Driver with Flash Timeout Protection
General DescriptionThe LM3551 and LM3552are fixed frequency, current mode
step-up DC/DC converters with two integrated NFETs that
canbe usedfor precision LED brightness control. The de-
vicesare capableof driving loadsupto1A froma single-cell
Li-Ion battery.
The LM3551 andLM3552 can drive oneor more high current
flash LEDs eitherina high power Flash modeora lower
power Torch mode usingthe TORCH/FLASH pin.A program-
mable Timeout functionon the FTO pin forces the internal
NFETsto turnoff aftera certain user defined time. An
externalSDpin (LM3551)orENpin (LM3552)is availableto
putthe device into low power shutdown mode. During shut-
down,the feedback resistors andthe load are disconnected
fromthe inputto avoid leakage current pathsto ground.
User programmable soft-start circuitry has been integrated eliminate large inrush currentsat start-up. Over-voltage
protection circuitry anda 1.25MHz switching frequency allow
for the useof small, low-cost output capacitors with lower
voltage ratings.
The LM3551 andLM3552are availableina lowprofile14pin
LLP package.
Features Upto1A total drive current Flash timeout protection Independent Torch/Flash/Shutdown modes LED disconnectin shutdown Programmable soft-start limits inrush current Over-voltage protection Wide voltage range 2.7to 5.5V 1.25MHz constant switching frequency Small, low profile package, non-pullback LLP14 (4mmx
4mm)
Applications 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 CircuitsAugust 2005
LM3551/LM3552
White
LED
Driver
with
Flash
imeout
Protection
