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reference designMPQ28261

Monolithic Power Systems MPQ28261

21V, 3A, 500kHz Synchronous Step-Down Coverter

Overview

TopologyBuck Converter
Input voltage4.5-21 V
Switching frequency425-575 kHz
Output 15 V / 3 A
IC revision1.12

Description

The MPQ28261 is a synchronous, rectified, step-down, switch-mode converter with built-in 120mΩ high-side MOSFET and 20mΩ low-sideMOSFET. It offers a very compact solution to achieve a continuous 3A output current over a wide input supply range, with excellent load and line regulation. Its synchronous mode operation increases its efficiency over its output current load range, and uses a fixed 500kHz switching frequency.Current mode operation provides a fast transient response and improves loop stabilization. Full protection features include over-current protection and thermal shut down.The MPQ28261 has an external SS pin to program the soft-start time and power-good signal output.The MPQ28261 requires a minimal number of readily-available standard external components and is available in a space saving 3mmx4mm 14-pin QFN package.

Features

  • Wide 4.5V-to-21V Operating Input Range
  • 3A Maximum Continuous Output Current
  • Integrated 120mΩ High-Side and 20mΩ Low-Side Power MOSFETs
  • 1% Reference Voltage Accuracy
  • Up to 85% Efficiency (for Drops of 12V to 1.2V)
  • Fixed 500kHz Switching Frequency
  • External Soft-Start
  • PG Output
  • OCP and Thermal Shutdown
  • Output Adjustable from 0.603V to 18V
  • Available in a 3mm x 4mm 14-pin QFN Package.

Typical applications

  • DSL Modems
  • Cable Modems
  • Set-Top Boxes
  • Telecom

More information

Products

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Data­sheet
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Status
Product series
L(µH)
ISAT,10%(A)
ISAT,30%(A)
IR,40K(A)
IRP,40K(A)
RDC max.(mΩ)
fres(MHz)
Size
Version
SamplesAvailability & Sample
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7447709004
SPECWE-PD SMT Power Inductor, 4.7 µH, 13 A
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Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-PD SMT Power Inductor
Inductance4.7 µH
Saturation Current @ 10%13 A
Saturation Current @ 30%16 A
Rated Current9.3 A
Performance Rated Current13.1 A
DC Resistance11 mΩ
Self Resonant Frequency38 MHz
Size1210 
VersionStandard 
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