Analog Devices MAX77505 is a low-quiescent current (800 nA typ), high-efficiency hysteretic buck converter operating from a 2.5 V to 16 V input voltage range. The device offers high efficiency over the entire load range. It is ideal for either a primary battery or four alkaline battery powered applications, which require long standby/idling time with short working time, such as asset tracking and door-lock devices.

A resistor (RSEL) selects one of thirty preset output voltages between 0.8 V and 5.5 V. The device has input undervoltage lockout, cycle-by-cycle switch current limit, and thermal shutdown to protect the system and the device itself. The device is available in a 10-lead FC2QFN package (2.0 mm x 2.0 mm x 0.55 mm).

The MAX77505 evaluation kit (EV kit) is a fully assembled and tested printed circuit board (PCB) that demonstrates the MAX77505 hysteretic step-down (buck) converter. The EV kit is a step-down voltage regulator circuit using the MAX77505 that is capable of a 2.5 V to 16 V input, 3 A of continuous load, and an adjustable output voltage between 0.8 V to 5.5 V using an RSEL resistor between the SEL pin and GND.