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 - Over
voltage 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...