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IR3721 - Power Monitor

Description

The IR3721 is a versatile power or current monitor IC for low-voltage DC-DC converters.

The IR3721 monitors the inductor current in buck or multiphase converters using either a current sensing resistor or the inductor’s winding resistance (DCR).

Features

  • Accurate TruePowerTM monitor.
  • 2.5% static accuracy.
  • Minimizes dynamic errors.
  • Minimizes power dissipation.
  • 5mV - 150mV full scale current range.
  • Versatile.
  • Monitors power or current.
  • Single buck or multiphase converters.
  • Inductor DCR or resistive shunt sensing.
  • Simple add-on to existing converters.
  • 10 pin 3x3 DFN lead free package.
  • RoHS compliant.

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Full PDF Text Transcription

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IR3721 DATA SHEET Power Monitor IC with Analog Output FEATURES „ Accurate TruePowerTM monitor • 2.5% static accuracy • Minimizes dynamic errors „ Minimizes power dissipation • 5mV - 150mV full scale current range „ Versatile • Monitors power or current • Single buck or multiphase converters • Inductor DCR or resistive shunt sensing „ Simple add-on to existing converters „ 10 pin 3x3 DFN lead free package „ RoHS compliant DESCRIPTION The IR3721 is a versatile power or current monitor IC for low-voltage DC-DC converters. The IR3721 monitors the inductor current in buck or multiphase converters using either a current sensing resistor or the inductor’s winding resistance (DCR). The output (DI) is a pulse code modulated signal whose duty ratio is proportional to the inductor current.
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