MP4312

MP4312

45V, 2A, Low-I_Q, Synchronous Step-Down Converter with Frequency Spread Spectrum

Description

The MP4312 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 (I_OUT) with current mode control for fast loop response.

The wide 3.3V to 45V input voltage (V_IN) range accommodates a variety of step-down applications in automotive input environments. A 1.7μA shutdown current (I_SD) 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 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 (I_L) 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 MP4312 is available in a QFN-20 (4mmx4mm) package.

Features & Benefits

Wide 3.3V to 45V Operating Input Voltage (V_IN) Range
2A Continuous Output Current (I_OUT)
1.7μA Low Shutdown Current (I_SD)
18μA Sleep Mode Quiescent Current (I_Q)
Internal 48mΩ/20mΩ High-Side and Low-Side MOSFETs (HS-FET and LS-FET)
350kHz to 1000kHz Configurable Switching Frequency (f_SW) for Car
Battery Applications
Can Be Synchronized to an 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 (t_{ON_MIN})
Selectable Advanced Asynchronous Modulation (AAM) Mode or Forced Continuous Conduction Mode (FCCM)
Low-Dropout (LDO) Mode
Over-Current Protection (OCP) with Hiccup Mode
Available in a QFN-20 (4mmx4mm) Package
Available in a Wettable Flank Package