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300 pcs
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300 pcs | On Request | 1 | On Request | On Request | 14+ | On Request | On Request |
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| Dimming | |
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The MCP1643-I/MS from Microchip Technology is a compact, high-efficiency, synchronous step-up converter designed to drive LEDs with constant current. It operates from one and two-cell alkaline or NiMH/NiCd batteries, making it suitable for portable LED lighting products like flashlights and headlamps.
This device features a low start-up voltage of 0.65V typical and can operate down to 0.5V. It supports up to 550 mA LED load current and includes features like overvoltage protection, inrush current limiting, and internal soft-start. The operating frequency is fixed at 1 MHz, and it supports Pulse-Width Modulation (PWM) for dimming control.
The MCP1643-I/MS is available in an 8-MSOP package and is designed for surface mount applications. It also includes overtemperature protection and a shutdown mode with low current consumption. Its integrated compensation and protection circuitry minimize external component count.
Key electrical specifications include a typical peak input current limit of 1.6A, a low reference voltage of 120 mV, and a maximum output voltage of 5.0V. The device is suitable for general LED constant current applications and LED supplies for backlights.
| Qty | Low | High |
|---|---|---|
| 1+ | $0.17 | $0.17 |
Estimated market price range - modelled values for guidance only, not live distributor offers.
The MCP1643-I/MS operates with an input voltage down to 0.5V and has a maximum input voltage of less than 5.0V.
The MCP1643-I/MS is supplied in an 8-MSOP package. It is also described as an 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) package.
The MCP1643-I/MS has an operating temperature range from -40°C to 85°C (TA).
The MCP1643-I/MS can support an LED load current of up to 550 mA.
The typical start-up voltage for the MCP1643-I/MS is 0.65V, measured with a 25 mA LED current.
The MCP1643-I/MS operates in Pulse-Width Modulation mode at 1 MHz.
Yes, the MCP1643-I/MS includes overtemperature protection with a threshold of +150°C and +25°C hysteresis.