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LM3551 Datasheet

  • LM3551

  • 1A White LED Driver with Flash Timeout Protection

  • 753.44KB

  • 15頁(yè)

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LM3551/LM3552 1A White LED Driver with Flash Timeout Protection
August 2005
LM3551/LM3552
1A White LED Driver with Flash Timeout Protection
General Description
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.
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.
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.
The LM3551 and LM3552 are available in a low profile 14 pin
LLP package.
Features
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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 package, non-pullback LLP14 (4mm x
4mm)
Applications
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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
漏 2005 National Semiconductor Corporation
DS201512
www.national.com

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