DESCRIPTION

The MPQ4320 is a configurable-frequency

(350kHz to 1.8MHz), synchronous, step-down

switching converter with integrated internal highside and low-side power MOSFETs (HS-FET

and LS-FET, respectively). The device provides

up to 0.5A of highly efficient output current (IOUT)

with peak current mode control.

The wide 3.3V to 36V input voltage (VIN) range

and 42V load dump tolerance accommodates a

variety of step-down applications in automotive

input environments. A 1μA shutdown current

(ISD) allows the device to be used in batterypowered 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 switching and gate driver

losses.

An open-drain power good (PG) signal indicates

whether the output is within 94.5% to 105.5% of

its nominal voltage.

Frequency foldback helps prevent inductor

current (IL) runaway during start-up. Thermal

shutdown provides reliable, fault-tolerant

operation. High duty cycle and low-dropout (LOD)

mode are provided for automotive cold-crank

conditions.

The MPQ4320 is available in a QFN-12

(2mmx3mm) package with wettable flanks or a

QFN-12 (3mmx4mm) package with wettable

flanks, and is AEC-Q100 qualified.

FEATURES

• Designed for Automotive Applications:

o Survives 42V Load Dump

o Supports 3.1V Cold Crank

o Up to 0.5A of Continuous Output

Current (IOUT)

o Continuous Operation Up to 36V

o -40°C to +150°C Junction Temperature

(TJ) Range

FEATURES (continued)

• Increases Battery Life:

o 1μA Shutdown Supply Current (ISD)

o 20μA Sleep Mode Quiescent Current

(IQ)

o Advanced Asynchronous Modulation

(AAM) Mode Increases Efficiency under

Light Loads

• High Performance for Improved Thermals:

o Integrated 70mΩ HS-FET and 50mΩ

LS-FET

o 65ns Minimum On Time (tON_MIN)

o 50ns Minimum Off Time (tOFF_MIN)

• Optimized for EMC/EMI:

o Frequency Spread Spectrum (FSS)

Modulation

o Symmetric VIN Pinout

o CISPR25 Class 5 Compliant

o 350kHz to 1.8MHz Configurable

Switching Frequency (fSW)

o MeshConnect™ Flip-Chip Package

• Additional Features:

o Power Good (PG) Output

o Low-Dropout (LDO) Mode

o Fixed Output Options (1): 1V, 1.8V, 2.5V,

3V, 3.3V, 3.8V, or 5V

o Hiccup Over-Current Protection (OCP)

o Available in a QFN-12 (2mmx3mm) or

QFN-12 (3mmx4mm) Package

o Available in a Wettable Flank Package

o Available in AEC-Q100 Grade 1

APPLICATIONS

• Automotive Infotainment

• Automotive Clusters

• Advanced Driver Assistance Systems

(ADAS)

• Industrial Power Systems