MP4321

MP4321

36V, 1A, Configurable-Frequency, Low-I_Q, Ultra-Compact, Synchronous Step-Down Converter with 42V Load Dump Tolerance

Datasheet

Description

The MP4321 is a configurable-frequency (350kHz to 2.5MHz), synchronous, step-down switching converter with integrated internal high-side and low-side power MOSFETs (HS-FET and LS-FET, respectively). The device provides up to 1A of highly efficient output current (I_OUT) with peak current control mode.

The wide 3.3V to 36V input voltage (V_IN) range and 42V load dump tolerance accommodates a variety of step-down applications in automotive input environments. The 1μA shutdown current (I_SD) allows the converter to be used in battery-powered applications.

High power conversion efficiency across the entire load range is achieved by scaling down the switching frequency (f_SW) 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 prevents inductor current (I_L) runaway during start-up. Thermal shutdown provides reliable, fault-tolerant operation. A high duty cycle and low-dropout (LDO) mode are provided for automotive cold-crank conditions.

The MP4321 is available in a QFN-12 (2mmx3mm) package with wettable flanks.

Features & Benefits

Designed for Aftermarket Automotive Applications:
- 42V Load Dump Tolerance
- Supports 3.1V for Cold-Crank Conditions
- Up to 1A of Continuous Output Current (I_OUT)
- Wide 3.3V to 36V Operating Input Voltage (V_IN) Range
- -40°C to +125°C Operating Junction Temperature (T_J) Range
Increases Battery Life:
- 1μA Shutdown Current (I_SD)
- 20μA Sleep Mode Quiescent Current (I_Q)
- Advanced Asynchronous Modulation (AAM) Mode for Increased Efficiency under Light-Load Conditions
High Performance for Improved Thermals:
- 70mΩ/50mΩ Integrated MOSFETs
- 65ns Minimum On Time (t_{ON_MIN})
- 50ns Minimum Off Time (t_{OFF_MIN})
Optimized for EMC/EMI Reduction:
- Frequency Spread Spectrum (FSS) Modulation
- Symmetric VIN Pinout
- CISPR25 Class 5 Compliant
- 350kHz to 2.5MHz Configurable Switching Frequency (f_SW)
- MeshConnect^TM Flip-Chip Package
Additional Features:
- Power Good (PG) Output
- Over-Current Protection (OCP) with Hiccup Mode
- Available in a QFN-12 (2mmx3mm) Package
- Available in a Wettable Flank Package

Active Part Numbers:

MP4321GDE-Z MP4321GDE-P

Meaning of P & Z

Related Products

EVQ4321-D-00A 36V, 1A, Low-I_Q, Synchronous Step-Down Converter in a QFN-12 Package Evaluation Board, AEC-Q100 Qualified

The EVQ4321-D-00A evaluation board is designed to demonstrate the capabilities of the MPQ4321, a 350kHz to 2.5MHz configurable-frequency, synchronous, step-down switching regulator with integrated, internal high-side MOSFETs (HS-FETs) and low-side MOSFETs (LS-FETs).

The MPQ4321 provides 1A of highly efficient output current (I_OUT) with peak current mode control. The wide 3.3V to 36V input voltage (V_IN) range and 42V load dump tolerance accommodate a variety of step-down applications in automotive input environments.

A 1μA quiescent current (I_Q) in shutdown mode 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 (f_SW) under light-load conditions, which reduces the 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 (I_L) runaway during start-up. Thermal shutdown provides reliable, fault-tolerant operation. A high duty cycle and low-dropout (LDO) mode are provided for automotive cold-crank conditions.

The EVQ4321-D-00A is fully assembled and tested. The MPQ4321 is available in a QFN-12 (2mmx3mm) package with wettable flanks. It is available in AEC-Q100 Grade 1.

$50.00
+ tax