New synchronous step-down converter simplifies IoT power conversion design plus up to 93% efficiency
The wide-input 3.3V to 36V, 3A buck converter with integrated MOSFETs and control circuitry from STMicroelectronics shrinks power-supply footprint for industrial 24V bus systems and IoT devices.
The DCP3603BCMR is a new synchronous step-down converter combining wide input capability and high integration to simplify power designs in industrial 24V bus systems and Internet of Things(IoT) devices. The converter handles input voltages from 3.3V up to 36V and delivers up to 3A output current.
The converter achieves up to 93% efficiency in typical configurations. Designers can choose between low-consumption mode (LCM) for maximum light-load efficiency and low-noise mode (LNM) for constant-frequency operation in EMI-sensitive applications. The DCP3603 operates at a fixed 500kHz or 1MHz switching frequency, allowing the use of small inductors to minimize solution size. An optional frequency dithering feature further reduces electromagnetic interference (EMI) peaks to ease compliance with emission standards.
Minimal external components are needed, only an inductor, two small capacitors, and two resistors, thanks to the DCP3603 internal compensation network and soft-start circuitry. This high level of integration, combined with a peak current mode control scheme, simplifies stability compensation and reduces design effort.