The MP4573 is a fully integrated, fixed-frequency, synchronous step-down converter. It can achieve up to 2.5A of continuous output current (IOUT) with peak current control for excellent transient response. The wide 4.5V to 60V input voltage (VIN) 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.
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