MCP1643T-I/MC: High-Efficiency, Fixed-Frequency Synchronous Boost Converter from Microchip

In the realm of power management, efficiency and compact design are paramount. The MCP1643T-I/MC from Microchip Technology stands out as a premier solution, engineered to meet the rigorous demands of modern portable and battery-powered applications. This high-efficiency, fixed-frequency synchronous boost converter integrates advanced features to deliver superior performance in a minimal footprint.

At its core, the MCP1643T is a synchronous boost converter that efficiently steps up input voltages as low as 0.35V to a programmable output up to 5.5V. This exceptionally low start-up voltage makes it ideal for applications powered by single or dual-cell alkaline, NiMH, or NiCd batteries, as well as single-cell Li-ion/Li-polymer batteries. The device operates at a fixed switching frequency of 1.6 MHz, enabling the use of tiny external inductors and capacitors. This high frequency not only minimizes the solution size but also reduces output voltage ripple, contributing to a cleaner and more stable power supply.

A key highlight of the MCP1643T is its high efficiency, which peaks at an impressive 96%. This is largely attributable to its integrated synchronous rectification. By utilizing an internal switch instead of an external diode, power loss is significantly reduced, enhancing overall thermal performance and extending battery life in end products. The converter also features a True Load Disconnect function during shutdown. This isolates the input from the output, preventing any battery drain when the system is powered down—a critical function for power-sensitive portable devices.

Furthermore, the device is designed for simplicity and robustness. It requires only three external components—an inductor, an input capacitor, and an output capacitor—to form a complete boost regulator solution. Its internal compensation network simplifies design-in, making it accessible for a wide range of developers. Additional built-in protections include over-current protection (OCP) and over-temperature protection (OTP), safeguarding the IC and the system under fault conditions.

Typical applications span a broad spectrum, including wireless headphones, wearable fitness trackers, handheld medical diagnostics, smart pens, and other space-constrained devices where maximizing run-time and minimizing PCB area are critical design goals.

ICGOOODFIND: The MCP1643T-I/MC is a highly integrated, efficient, and compact power solution that excels in portable electronics, offering exceptional performance from very low input voltages and ensuring long battery life.

Keywords: Synchronous Boost Converter, High Efficiency, Fixed Frequency, True Load Disconnect, Low Start-Up Voltage