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MCP1643
  • MCP1643
  • MCP1643

MCP1643

In Production

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.

Microchip Technology MCP1643 Product Info

16 April 2026 0

Parameters

VIN Min V (volt)

0.5

VIN Max V (volt)

5.0

VOUT Min V (volt)

0.6

VOUT Max V (volt)

5.0

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

Description

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.

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