MP4323 Datasheet | Monolithic Power Systems

42V Load Dump Tolerant, 3A, Ultra-pact, Low-IQ, Synchronous Step-Down Converter DESCRIPTION The MP4323 is a frequency-configurable (350k Hz to 2.5MHz), synchronous, step-down switching converter with integrated internal highside and low-side power MOSFETs (HS-FET and LS-FET, respectively). It can achieve up to 3A of highly efficient output current (IOUT) with peak current control mode. The wide 3.3V to 36V input voltage (VIN) range and 42V load dump tolerance acmodate 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 (f SW) under light-load conditions to reduce the switching and gate driver losses. An open-drain power good (PG) signal indicates whether the output voltage (VOUT) is between 94.5% and 105.5% of its nominal voltage. Frequency foldback prevents inductor current (IL) runaway during start-up. Thermal shutdown provides reliable, fault-tolerant operation. A high duty cycle and low-dropout mode are provided for automotive cold-crank conditions. The MP4323 is available in a QFN-12 (2mmx3mm) package. Features - Designed for Automotive Applications: o 42V Load Dump Tolerance o Supports 3.1V Cold Crank o 3A Continuous Output Current (IOUT) o Wide 3V to 36V Operating Input Voltage (VIN) Range o -40°C to +125°C Junction Temperature (TJ) Range - Increases Battery Life: o 1μA Shutdown Current (ISD) o 20μA Sleep Mode Current o Advanced Asynchronous Modulation (AAM) Mode for Increased Efficiency under Light-Load Conditions - High Performance for Improved Thermals: o Integrated 70mΩ HS-FET and 50mΩ LS-FET o 65ns Minimum On Time (t ON_MIN) and 50ns Minimum Off Time (t OFF_MIN) - Optimized for EMC/EMI Reduction: o Frequency Spread Spectrum (FSS) Modulation o Symmetric VIN Pins (Pin 2 and Pin 10) o CISPR25 Class 5 pliant o 350k Hz to 2.5MHz...