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Part Number: LM3557
Description: The LM3557 is a complete solution for white LED drive applications. With minimal external component co...
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LM3557
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DataSheet
General Description
LM3557 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 advantage of multi-cell input applications. With small external components, high fixed frequency operation, and wide input voltage range, the LM3557 is the most optimal choice for LED lighting applications.
LM3557 Maximum Ratings
| VIN Pin En Pin Fb Pin Sw2 Pin Ovp Pin Sw1 Pin Continuous Power Dissipation Maximum Junction Temperature (TJ-MAX) Storage Temperature Range ESD Rating (Note 2) Human Body Model Machine Model |
−0.3V to +8V −0.3V to +8V −0.3V to +8V −0.3V to +8V −0.3V to +30V −0.3V to +40V Internally Limited +150°C −65°C to +150°C 2 kV 150V |
LM3557 Features
1.25 MHz Constant-Switching Frequency
Output Over-Voltage Protection
Input Under-Voltage Protection
Cycle-By-Cycle Current Limit
TRUE SHUTDOWN: No DC current paths to ground during shutdown
Low Profile Package: <1 mm Height -8 Pin LLP
No External Compensation
Output Over-Voltage Protection
Input Under-Voltage Protection
Cycle-By-Cycle Current Limit
TRUE SHUTDOWN: No DC current paths to ground during shutdown
Low Profile Package: <1 mm Height -8 Pin LLP
No External Compensation
LM3557 Typical Application
White LED Display Lighting
Cellular Phones
PDAs
Cellular Phones
PDAs
LM3557 Connection Diagram
LM3557
PDF/DataSheet Download
- Datasheet: LM3557
- File Size: 658247 KB
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