The MPQ4340 is a configurable-frequency (350kHz to 2.5MHz), synchronous, step-down switching regulator with integrated internal high-side and low-side power MOSFETs (HS-FET and LS-FET, respectively). It can achieve up to 4A of highly efficient output current (I_OUT) with fixed-frequency, zero-delay pulse-width modulation (PWM) control for near-optimal transient response.

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 a wide load range is achieved by scaling down the switching frequency (f_SW) at light loads to reduce the switching and gate driving losses.

An open-drain power good (PG) signal indicates whether the output is within 94% to 106% of its nominal voltage. Thermal shutdown provides reliable, fault-tolerant operation.

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

The MPQ4340 is available in a QFN-17 (3mmx4mm) package.