ST launches new buck converter series for low-voltage loads

STMicroelectronics has introduced a groundbreaking monolithic 1A buck converter designed for low voltage loads, requiring just six external components. This innovative device marks the beginning of a series that includes variants tailored for different controllers, 3A supply, and automotive qualification.

The DCP3601 integrates power switches and compensation, streamlining the circuit design by necessitating only six components to complete the setup. These components include the inductor, bootstrap and filter capacitors, as well as feedback resistors for configuring the output voltage.

With an input voltage range of 3.3V to 36V and an output capacity of 1A, the converter is suitable for a wide range of applications such as smart meters, household appliances, and industrial 24V conversion. Its synchronous rectification and fixed switching frequency of 1MHz ensure exceptional efficiency, reaching up to 91% at 600mA with a 12V input and 5V output.

Various versions of the converter are available, catering to different operational requirements. These range from forced-PWM operation for noise-sensitive applications to pulse-skipping at light loads to minimize power consumption. All variants feature low quiescent current of 110µA and an Enable pin for power-saving shutdown, with some models offering frequency dithering to reduce noise power at the 1MHz switching frequency.

For easy evaluation and implementation, STMicroelectronics offers the STEVAL-3601CV1 evaluation board, equipped with screw terminals and headers for convenient setup. This board allows users to quickly power up the circuit, showcasing an efficient design with a compact footprint. Additionally, the DCP3601 is part of ST's 10-year longevity program, ensuring long-term availability and support for customers. Packaged in a compact 3mm x 1.6mm SOT23 6-lead format, the single-chip buck converter is priced competitively, starting from $0.48 for orders of 1000 pieces.