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reference designMP9403

Monolithic Power Systems MP9403

3A, 7V, 250kHz Integrated Synchronous Step-Down Converter

Overview

TopologyBuck Converter
Input voltage4.3-7 V
Switching frequency215-285 kHz
Output 11.2 V / 3 A
IC revision0.9

Description

The MP9403 is a monolithic synchronous buck regulator. The device integrates a 150mΩ high-side MOSFET and a 100mΩ low-side MOSFET that provides 3A continuous load current over input voltage of 4.3V to 7V. Current mode control provides fast transient response and cycle-by-cycle current limit.An adjustable soft-start prevents inrush current at turn-on. In shutdown mode, the supply current drops to 1μA.This device, available in an 8-pin SOIC package with exposed pad, provides a very compact system solution with minimal reliance on external components.

Features

  • 3A Output Current
  • 4.3V to 7V Operating Input Range
  • Integrated MOSFET Switches
  • Output Adjustable from 0.80V to 5.50V
  • Up to 93% Efficiency
  • Programmable Soft-Start
  • Stable with Low ESR Ceramic Output Capacitors
  • Fixed 250kHz Frequency
  • Cycle-by-Cycle Over Current Protection
  • Input Under Voltage Lockout
  • Thermally Enhanced 8-Pin SOIC Package

Note:Refer page no 7 for Inductor selection guide.

Typical applications

  • Notebook Computers
  • Pre-Regulator for Linear Regulators
  • Distributed Power Systems

More information

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L(µH)
IRP,40K(A)
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744777004
SPECWE-PD SMT Power Inductor, 4.7 µH, 4.9 A
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Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-PD SMT Power Inductor
Inductance4.7 µH
Performance Rated Current4.9 A
Saturation Current4 A
DC Resistance40 mΩ
Self Resonant Frequency37 MHz
Size7345 
VersionStandard 
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