MAX1572ETC250+

The MAX1572ETC250+ from Analog Devices (Maxim Integrated) is a fixed-frequency, synchronous step-down DC-to-DC converter. It is engineered to power low-voltage microprocessor and DSP cores in portable devices, prioritizing high efficiency within a limited PCB area.

This converter operates with an input voltage range of 2.6V to 5.5V and provides a guaranteed output current of 800mA. The output voltage is internally fixed at 2.5V. Its 2MHz switching frequency enables the use of small external components like a 2.2µH inductor and 10µF ceramic output capacitor, contributing to a low-profile design. Power-saving modes, including pulse-group and pulse-skip, reduce quiescent current to a typical 48µA under light loads.

Key features include up to 97% efficiency, a low 48µA quiescent current, and a 170ms minimum RESET output for power-on reset functionality. The device integrates an internal MOSFET switch and synchronous rectifier, eliminating the need for an external Schottky diode. It also incorporates soft-start to prevent inrush current during startup.

The MAX1572ETC250+ is supplied in a compact 12-pin, 4mm x 4mm thin QFN package with an exposed paddle, suitable for space-constrained applications. Its design is optimized for high efficiency over a wide load range, low output ripple, and excellent transient response, making it ideal for applications such as cell phones, PDAs, MP3 players, and digital cameras.