23 October 2019
Power Electronics / Power Management
The MPQ4572 is a fully integrated, fixed-frequency synchronous step-down converter. It can achieve up to 2 A continuous output current with peak current control for excellent transient response. The wide 4,5 V to 60 V input voltage range accommodates a variety of step-down applications in automotive environments, and 2 μA shutdown mode quiescent current allows for use in battery-powered applications.
The device integrates internal high-side and low-side power MOSFETs for high efficiency without an external Schottky diode, and is available in a 12-pin QFN package. With internal compensation, the MPQ4572 can offer a very compact solution with a minimum number of readily available standard external components.
The MPQ4572 employs AAM (advanced asynchronous modulation) mode which helps achieve high efficiency during light load by scaling down the frequency to reduce the switching and gate driver losses.
The converter offers standard features including built-in soft-start, enable control and power good indicator. High duty cycle and low drop-out mode are provided for the automotive cold crank condition. In addition, the chip provides over-current protection with valley current detection which is used to avoid current runaway. It also has hiccup short-circuit protection, input under-voltage lockout and auto recovery thermal protection.
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