STMicroelectronics Announces 3A Single-Chip Step-Down DC/DC Converter for Home Appliances and Industrial Equipment

STMicroelectronics has launched the DCP3603, a monolithic 3A step-down DC/DC converter in a compact 3 x 1.6mm footprint. Designed for smart meters, home appliances, and industrial 24V equipment, it features a wide input voltage range (3.3V to 36V), high efficiency up to 93%, and integrated components to simplify design and reduce board space.
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  • 📰 Published: March 30, 2026 at 05:11

STMicroelectronics (NYSE: STM, hereafter ST) has announced the "DCP3603", a monolithic step-down DC/DC converter with a small 3 x 1.6mm footprint and 3A supply capability. This product contributes to simplified design, reduced board area, shorter development time, and improved system reliability. With a wide input voltage range of 3.3V to 36V, it can be used in applications such as smart meters, home appliances, and industrial 24V equipment.

Utilizing a synchronous rectification system and offering a choice of 1MHz or 500kHz fixed switching frequency, the DCP3603 maintains high efficiency across the entire load range, achieving 93% conversion efficiency at a 600mA load (12V input / 5V output). Since the power switches and compensation functions are built-in, the circuit is completed with only an inductor, bootstrap circuit, filter capacitor, and feedback resistor, minimizing the number of components.

Two variations of the DCP3603 are available. Depending on the application, users can choose between a version with forced PWM mode for optimal performance in noise-sensitive applications and a version with pulse-skipping mode to minimize power consumption at light loads. Both products feature frequency dithering to reduce noise power generated at switching frequencies and minimize total power consumption with an extremely low quiescent current of 85µA. Additionally, further power savings can be achieved by turning off the converter using the enable pin.

New designs featuring the DCP3603 can be quickly evaluated using the dedicated evaluation board "STEVAL-3603BC1". This evaluation board is compact and features screw terminals and headers for easy connection, allowing for immediate start of operation checks.

DCP3603 is currently in mass production and is available in a 6-lead SOT23 package. The unit price is approximately $0.44 for purchases of 1,000 units.

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