MP4323

The MP4323 is a configurable-frequency (350kHz to 2.5MHz), synchronous, step-down switch-mode converter with integrated internal high-side and low-side power MOSFETs (HS-FET and LS-FET, respectively). The device can achieve up to 3A of highly efficient output current (I_OUT) with peak current control mode.

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 current (I_SD) allows the device to be used in battery-powered applications. A high duty cycle and low-dropout (LDO) mode are provided for automotive cold-crank conditions.

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 the 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 runaway during start-up. Thermal shutdown provides reliable, fault-tolerant operation.

The MP4323 is available in a QFN-12 (2mmx3mm) package.