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LM3552SDX/NOPB 数据手册 - National Semiconductor（美国国家半导体）
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LM3552SDX/NOPB数据手册
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LM3551/LM3552
March 31, 2011
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 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 current
flash LEDs either in a high power Flash mode or a lower pow-
er Torch mode using the TORCH/FLASH pin. A pro-
grammable 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 pro-
tection 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
■
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
■
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
© 2011 National Semiconductor Corporation 201512 www.national.com
LM3551/LM3552 1A White LED Driver with Flash Timeout Protection
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