MP4315

45V, 5A, Low I_Q, Synchronous Step-Down Converter with Frequency Spread Spectrum and Power Good Indication

Datasheet

Description

The MP4315 is a synchronous step-down switching converter with a configurable frequency, as well as an integrated internal high-side MOSFET (HS-FET) and low-side MOSFET (LS-FET). The device provides up to 5A 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. The MP4315’s low 1.7μA shutdown mode quiescent current (I_Q) makes the device well-suited for 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 93% to 106% 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 the automotive cold-crank conditions.

The MP4315 is available in a QFN-20 (4mmx4mm) wettable flank package.

Features & Benefits

Wide 3.3V to 45V Operating Input Voltage (V_IN) Range
5A Continuous Output Current (I_OUT)
1.7μA Low Shutdown Supply Current
18μA Sleep Mode Quiescent Current (I_Q)
Internal 48mΩ High-Side MOSFET (HS-FET) and 20mΩ Low-Side MOSFET (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 V_IN for Low EMI
Power Good (PG) Output
External Soft Start (SS)
100ns Minimum On Time (t_ON)
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