The DCP3603BCMR is a synchronous step-down converter that provides up to 3A of output current from input sources between 3.3V and 36V. It is designed to simplify power conversion designs, while supporting a wide range of applications from battery-powered systems to industrial 12V and 24V rails.
Switching frequency of the DCP3603BCMR is fixed at 1MHz, allowing the use of small inductors and capacitors to minimize solution footprint. Efficiency reaches 93% at 1A load with 12V input and 5V output, while integrated protections such as output over-voltage protection and thermal shutdown.
STMicroelectronics offers DCP3603 in multiple variants. In addition to the DCP3603BCMR, which is the low consumption mode (LCM) 1MHz version with dithering off, there are variants such as DCP3603BNMR for low noise mode (LNM), as well as DCP3603BCDMR and DCP3603BNDMR including switching frequency dithering for improved electromagnetic interference (EMI) performance. There are also 500kHz options, ACMR, ANMR, ACDMR, ANDMR, to support designs that prefer a lower switching frequency.
The STEVAL-3603BC1 evaluation board demonstrates a synchronous step-down converter design able to deliver up to 3A output current from a 3.3V to 36V input, with a 5V output voltage. The board uses the DCP3603BCMR in the thin SOT23-6L package and shows how efficient conversion can be achieved using the converter, an inductor, two small capacitors, and two resistors. It is suitable for power conversion in major appliances, smart metering, industrial 24V bus conversion, and general-purpose wide Vin power supplies.
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