MPQ4324 Synchronous Step-Down Converter

MPS' MPQ4324E is a configurable-frequency (350 kHz to 2.5 MHz), synchronous, step-down switching converter with integrated, internal high-side and low-side power MOSFETs (HS-FET and LS-FET, respectively). The device provides up to 4 A peak of highly efficient output current (I_OUT) with peak current mode control.

The wide 3.3 V to 36 V input voltage (V_IN) range and 42 V load dump tolerance accommodate a variety of step-down applications in automotive input environments. A 1 μA shutdown current (I_SD) allows the device to be used in battery-powered applications.

High power conversion efficiency across a wide load range is achieved by scaling down the switching frequency (f_SW) under light-load conditions to reduce switching and gate driver losses. An open-drain power good (PG) signal indicates whether the output voltage (V_OUT) 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 (LDO) mode are provided for automotive cold-crank conditions.

The MPQ4324E is available in a QFN-12 (2 mm x 3 mm) package with wettable flanks, and is AEC-Q100 qualified.