DESCRIPTION

The MPQ4312 is a configurable-frequency, synchronous step-down switching converter with integrated internal high-side and low-side power MOSFETs (HS-FET and LS-FET, respectively). It provides up to 2A of highly efficient output current (IOUT) with current mode control for fast loop response.

The wide 3.3V to 45V input voltage (VIN) range accommodates a variety of step-down applications in automotive input environments. A 1.7μA shutdown mode quiescent current allows the device to be used in battery-powered applications.

High power conversion efficiency across a wide load range is achieved by scaling down the switching frequency (fSW) under light-load conditions to reduce the switching and gate driver losses. An open-drain power good (PG) signal indicates whether the output is within 95% to 105% of its nominal voltage.

Frequency foldback helps prevent inductor current runaway during start-up. Thermal shutdown provides reliable, fault-tolerant operation. High-duty cycle and low-dropout mode are provided for automotive cold-crank conditions.

The MPQ4312 is available in a QFN-20 (4mmx4mm) package.

FEATURES

• Wide 3.3V to 45V Operating Input Voltage (VIN) Range

• 2A Continuous Output Current (IOUT)

• 1.7μA Low Shutdown Supply Current (ISHDN)

• 18μA Sleep Mode Quiescent Current

• Internal 48mΩ High-Side and 20mΩ Low-Side MOSFETs

• 350kHz to 1000kHz Configurable Switching Frequency (fSW) for Car Battery Applications

• Synchronizable with External Clock

• Out-of-Phase Synchronized Clock Output

• Frequency Spread Spectrum (FSS) for Low EMI

• Symmetric VIN for Low EMI

• Power Good (PG) Output

• External Soft Start (SS)

• 100ns Minimum On Time

• Selectable Advanced Asynchronous Mode (AAM) or Forced Continuous Conduction Mode (FCCM)

• Low-Dropout Mode

• Hiccup Over-Current Protection (OCP)

• Available in a QFN-20 (4mmx4mm) Package

• Available in a Wettable Flank Package

• Available in AEC-Q100 Grade 1

APPLICATIONS

• Automotive Infotainment

• Automotive Clusters

• Advanced Driver Assistance Systems (ADAS)

• Industrial Power Systems