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LM3557SD-2 |LM3557SD2NSN/a32500avaiStep-Up Converter for White LED Applications
LM3557SDX-2 |LM3557SDX2NS N/a17134avaiStep-Up Converter for White LED Applications


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LM3557SDX-2 ,Step-Up Converter for White LED Applicationsapplications.Withminimalexternalcomponentcount,noDCn Cycle-By-Cycle Current Limitcurrent leakage pa ..
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LM3557SD-2-LM3557SDX-2
Step-Up Converter for White LED Applications
LM3557
Step-Up Converter for White LED Applications
General Description

The LM3557isa complete solutionfor white LED drive
applications. With minimal external component count,no DC
current leakage pathsto 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 switchesata fixed-frequencyof 1.25 MHz,
which allowsforthe useof small external components. Also,
the LM3557 hasa wide input voltage rangeto take advan-
tageof multi-cell input applications. With small external com-
ponents, high fixed frequency operation, and wide input
voltage range, the LM3557is the most optimal choicefor
LED lighting applications.
Features
VIN Range: 2.7V–7.5V Small External Components 1.25 MHz Constant-Switching Frequency Output Over-Voltage Protection Input Under-Voltage Protection Cycle-By-Cycle Current Limit TRUE SHUTDOWN:No DC current pathsto ground
during shutdown Low Profile Package:<1 mm Height-8 Pin LLP No External Compensation
Applications
White LED Display Lighting Cellular Phones PDAs
Typical Application Circuit

FIGURE1. Backlight Configuration
November 2004
LM3557
Step-Up
Converter
for
White
LED
Applications
ic,good price


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