MCP1643 Series

1MHz Low Start-up Voltage Synchronous Boost LED Constant Current Regulator

Catalog

1MHz Low Start-up Voltage Synchronous Boost LED Constant Current Regulator

Part	Applications	Number of Outputs	Topology	Supplier Device Package	Package / Case	Package / Case [custom]	Package / Case	Voltage - Output	Dimming	Voltage - Supply (Min) [Min]	Frequency	Type	Current - Output / Channel	Operating Temperature [Max]	Operating Temperature [Min]	Voltage - Supply (Max) [Max]	Mounting Type	Grade	Qualification	Voltage - Output [Min]	Voltage - Output [Max]
Microchip Technology MCP1643T-I/MS	Backlight	1	Step-Up (Boost)	8-MSOP	8-MSOP 8-TSSOP	0.118 in	3 mm	5 V	PWM	500 mV	1 MHz	DC DC Regulator	550 mA	85 °C	-40 °C	5 V	Surface Mount
Microchip Technology MCP1643-I/MSVAO	Backlight	1	Step-Up (Boost)	8-MSOP	8-MSOP 8-TSSOP	0.118 in	3 mm		PWM	500 mV	1 MHz	DC DC Regulator	550 mA	85 °C	-40 °C	5 V	Surface Mount	Automotive	AEC-Q100	0.6 V	5 V
Microchip Technology MCP1643T-I/MC	Backlight	1	Step-Up (Boost)	8-DFN (2x3)	8-VFDFN Exposed Pad			5 V	PWM	500 mV	1 MHz	DC DC Regulator	550 mA	85 °C	-40 °C	5 V	Surface Mount
Microchip Technology ADM00435
Microchip Technology MCP1643-I/MS	Backlight	1	Step-Up (Boost)	8-MSOP	8-MSOP 8-TSSOP	0.118 in	3 mm	5 V	PWM	500 mV	1 MHz	DC DC Regulator	550 mA	85 °C	-40 °C	5 V	Surface Mount

Catalog

1MHz Low Start-up Voltage Synchronous Boost LED Constant Current Regulator

Key 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.