MCP1643 is a compact, high-efficiency, fixed frequency, synchronous step-up LED driver with constant current, that operates from one and two-cell alkaline and NiMH/NiCd batteries. The device can also drive two red/green/yellow series connection LEDs.
Additional 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
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: 1.2 µA (typical)
Overtemperature protection
Packages:MSOP-8, 2x3 DFN-8
MCP1643 is a compact, high-efficiency, fixed frequency, synchronous step-up LED driver with constant current, that operates from one and two-cell alkaline and NiMH/NiCd batteries. The device can also drive two red/green/yellow series connection LEDs.
Additional 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
- 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: 1.2 µA (typical)
- Overtemperature protection
- Packages:MSOP-8, 2x3 DFN-8
