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MCP1643
1 MHz Low Start-up Voltage Synchronous Boost LED Constant Current Regulator
Features
• 1.6A Typical Peak Input Current Limit • Up to 550 mA LED Load Current • Low Start-up Voltage: 0.65V (typical, 25 mA LED
Current) • Low Operating Input Voltage: down to 0.5V • Maximum Input Voltage < VLED < 5.0V • Maximum Output Voltage:
- 5.0V - Overvoltage Protection • Low Reference Voltage: - VFB = 120 mV - Minimal Power Loss on Sense Resistor • Pulse-Width Modulation Mode Operation (1 MHz) • Internal Synchronous Rectifier • Internal Compensation • Inrush Current Limiting • Internal Soft-Start (240 µs typical) • Shutdown (EN = GND): - True Load Disconnect - Dimming Control by Variable Duty Cycle • Shutdown Current: 1.
MCP1643 Datasheet
