MCP1252T-ADJI/MS: A High-Efficiency, Adjustable Output, Positive-to-Negative Voltage Inverter

In modern electronic design, the need to generate a stable negative voltage rail from a single positive supply is a common and critical challenge. Applications ranging from operational amplifiers and data converters to sensors and audio equipment often require a negative bias voltage. The MCP1252T-ADJI/MS from Microchip Technology is a specialized integrated circuit engineered to meet this demand with high performance and remarkable flexibility. This device is a charge pump voltage inverter that efficiently converts a positive input voltage into a user-adjustable negative output, eliminating the need for bulky inductors and simplifying board layout.

A standout feature of the MCP1252T-ADJI/MS is its high power conversion efficiency, which can reach up to 90%. This is achieved through its advanced switched capacitor architecture and low internal resistance, minimizing power loss and heat generation. This high efficiency is crucial for battery-powered and portable applications where extending operational life is paramount. Unlike fixed-output inverters, this device offers a significant advantage through its adjustable output voltage. By using two external resistors, designers can set the negative output voltage (VOUT) anywhere within the range of -1.5V to -VIN, providing unparalleled design flexibility to match specific system requirements.

The device operates from a positive input voltage (VIN) range of 1.5V to 5.5V, making it compatible with common power sources like single-cell Li-ion batteries, 3.3V, or 5V system rails. It can deliver a continuous output current of up to 120mA, sufficient for a wide array of low-power analog circuits. Furthermore, the MCP1252T-ADJI/MS incorporates an integrated low-battery detection circuit, which can be used to monitor the input supply and provide an early warning signal to a microcontroller, enhancing system reliability.

Housed in a space-saving 8-pin MSOP package, the device is ideal for compact designs. Its inductor-free operation not only reduces the total solution size but also mitigates electromagnetic interference (EMI) concerns often associated with switching regulators. Additional built-in protections, including short-circuit and current-limit protection, safeguard both the IC and the downstream load from damage under fault conditions.

ICGOOODFIND: The MCP1252T-ADJI/MS stands out as an exceptional solution for generating an adjustable negative voltage. Its combination of high efficiency, compact inductor-free design, and flexible output programmability makes it an indispensable component for portable, battery-sensitive, and space-constrained applications where reliable and efficient power inversion is required.

Keywords: Positive-to-Negative Voltage Inverter, Adjustable Output Voltage, High Efficiency, Charge Pump, Low-Battery Detection.