The EVQ4321-D-01A is an evaluation board designed to demonstrate the capabilities of the MPQ4321-AEC1, a configurable-frequency (350kHz to 2.5MHz), synchronous, step-down switching converter with integrated, internal high-side MOSFETs (HS-FETs) and low-side MOSFETs (LS-FETs).

The MPQ4321-AEC1 provides up to 1A of highly efficient output current (I_OUT) with peak current mode control. The wide 3.3V to 36V input voltage (V_IN) range and 42V load dump tolerance accommodate a variety of step-down applications in automotive input environments. A 1μA shutdown mode quiescent current (I_Q) allows the device to be used in battery-powered applications.

High power conversion efficiency across the wide load range is achieved by scaling down the switching frequency (f_SW) under light-load conditions to reduce the switching and gate driving losses.

An open-drain power good (PG) signal indicates whether the output is within 94.5% to 105.5% of its nominal voltage.

Frequency foldback helps prevent inductor current (I_L) runaway during start-up. Thermal shutdown provides reliable, fault-tolerant operation.

A high duty cycle and low-dropout mode are provided for automotive cold-crank conditions.

The EVQ4321-D-01A is fully assembled and tested. The MPQ4321-AEC1 is available in a QFN-12 (2mmx3mm) package with wettable flanks. It is available in AEC-Q100.