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MP4436A

45V, 6A, Low I_Q,Synchronous Step-Down Converter

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Description

The MP4436/MP4436A is a synchronous, step-down switching regulator with a configurable frequency and integrated internal high-side and low-side power MOSFETs. It provides a maximum 6A of highly efficient output, as well as current mode control for a fast loop response.

The wide 3.3V to 45V input range accommodates a variety of step-down applications in an automotive input environment. A 1.7μA shutdown mode quiescent current allows the part to be used in battery-powered applications.

High power conversion efficiency across a wide load range is achieved by scaling down the switching frequency in light-load conditions to reduce the switching and gate driver losses.

An open-drain power good signal indicates that 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 automotive cold crank conditions.

The MP4436/MP4436A is available in a QFN-20 (4mmx4mm) package.

Features & Benefits

Wide 3.3V to 45V Operating Voltage Range
6A Continuous Output Current
1.7μA Low Shutdown Supply Current
18μA Sleep Mode Quiescent Current
Internal 48mΩ High-Side and 20mΩ Low-Side MOSFET
350kHz to 530kHz Configurable Switching Frequency for Car Battery Applications
Synchronize to External Clock
Multi-Phase Capability
Out-of-Phase Synchronized Clock Output
MP4436A: Frequency Spread Spectrum (FSS) Option for Low EMI
Symmetric V_IN for Low EMI
Power Good Output
External Soft Start
100ns Minimum On Time
Selectable Advanced Asynchronous Mode (AAM) or Forced Continuous Conduction Mode (FCCM)
Low-Dropout Mode
Hiccup Mode for Over-Current Protection
Available in a QFN-20 (4mmx4mm) Package