MP4573

The MP4573 is a fully integrated, fixed-frequency, synchronous step-down converter. It can achieve up to 2.5A of continuous output current (I_OUT)  with peak current control for excellent transient response. The wide 4.5V to 60V input voltage (V_IN) range accommodates a variety of step-down applications in automotive input environments. The device’s 2μA shutdown current makes it ideal for battery-powered applications. The MP4573’s integrated, internal high-side and low-side power MOSFETs (HS-FET and LS-FET, respectively) provide high efficiency without the need for an external Schottky diode. Advanced asynchronous modulation (AAM) mode achieves high efficiency under light-load conditions by scaling down the frequency to reduce switching and gate driver losses.

Features include built-in soft start (SS), enable (EN) control, and power good (PG) indication. The high duty cycle and low-dropout (LDO) mode allow the device to withstand automotive cold crank conditions. The MP4573 employs over-current protection (OCP) with valley current detection to avoid current runaway. It also features short-circuit protection (SCP) with hiccup mode, input under-voltage lockout (UVLO), and auto-recovery thermal protection.

With internal compensation, the MP4573 offers an ultra-compact solution that requires a minimal number of readily available, standard external components. It is available in a QFN-12 (2.5mmx3mm) package.