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LM3557 Fiches technique(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No de pièce LM3557
Description  Step-Up Converter for White LED Applications
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3557 Fiches technique(HTML) 1 Page - National Semiconductor (TI)

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LM3557
Step-Up Converter for White LED Applications
General Description
The LM3557 is a complete solution for white LED drive
applications. With minimal external component count, no DC
current leakage paths to ground, cycle-by-cycle current limit
protection, and output over-voltage protection circuitry, the
LM3557 offer superior performance and cost savings over
standard DC/DC boost component implementations.
The LM3557 switches at a fixed-frequency of 1.25 MHz,
which allows for the use of small external components. Also,
the LM3557 has a wide input voltage range to take advan-
tage of multi-cell input applications. With small external com-
ponents, high fixed frequency operation, and wide input
voltage range, the LM3557 is the most optimal choice for
LED lighting applications.
Features
n
V
IN Range: 2.7V–7.5V
n
Small External Components
n
1.25 MHz Constant-Switching Frequency
n
Output Over-Voltage Protection
n
Input Under-Voltage Protection
n
Cycle-By-Cycle Current Limit
n
TRUE SHUTDOWN: No DC current paths to ground
during shutdown
n
Low Profile Package: <1 mm Height -8 Pin LLP
n
No External Compensation
Applications
n
White LED Display Lighting
n
Cellular Phones
n
PDAs
Typical Application Circuit
20131601
FIGURE 1. Backlight Configuration
November 2004
© 2004 National Semiconductor Corporation
DS201316
www.national.com


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