The MPQ4571 is a fully integrated, fixed-frequency, synchronous step-down converter. It can achieve up to 1A of continuous output current with peak current control for excellent transient response.
The wide 4.5V to 60V input voltage range accommodates a variety of step down applications in an automotive input environment. The device’s 2μA shutdown mode quiescent current makes it ideal in battery-powered applications.
The MPQ4571 integrates internal high-side and low-side power MOSFETs for high efficiency without an external Schottky diode It employs advanced asynchronous modulation (AAM) to achieve high efficiency during light-load conditions by scaling down the frequency to reduce switching and gate driver losses.
Standard features include built-in soft start, enable control, and power good indication. High-duty cycle and low-dropout mode are provided for automotive cold crank conditions.
The chip provides over-current protection (OCP) with valley current detection to avoid current runaway. It also has hiccup short-circuit protection (SCP), input under-voltage lockout (UVLO), and auto-recovery thermal protection.
With internal compensation, the MPQ4571 offers a very compact solution with a minimal number of readily available, standard external components. It is available in a QFN-12 (2.5mmx3mm) package.