IR3720

IR3720 DATA SHEET Power Monitor IC with Digital I2C Interface FEATURES Accurate TruePower™ monitor • Minimizes dynamic errors • Reports voltage, current, or power Digital interface • SMBus and I2C compatible Programmable averaging interval Flexible current sensing • Resistive or Inductor DCR Applications • Synchronous rectified buck converters • Multiphase converters 10pin 3x3 DFN lead free package RoHS compliant DESCRIPTION The IR3720 measures the output voltage and inductor current of low-voltage DC-to-DC converters and reports the average power over a user specified time interval as a digital word on the I2C. The output current is measured across a current sensing resistor or indirectly across the inductor’s DCR winding resistance. Additionally, the current measurement method is also applicable to multiphase converters. The real time voltage and current signals are multiplied, digitized, and averaged over a user selectable averaging interval providing Patent Pending TruePower™ measurement of highly dynamic loads. TYPICAL APPLICATION CIRCUIT Phase Single Phase Converter DCR L Rcs1 Rcs2 CCS1 CCS2 Output Capacitors 3.3V LOAD VO VDD IR3720 VCS GND To system Controller I2C Bus VREF 2 RT Power Return GND ORDERING INFORMATION Device IR3720MTRPBF * IR3720MPBF * Samples only Package 10 lead DFN (3x3 mm body) 10 lead DFN (3x3 mm body) Order Quantity 3000 piece reel 121 Piece tube Page 1 of 20 www.irf.com 09/09/08 IR3720 DATA SHEET ABSOLUTE MAXIMUM RATINGS All voltages referenced to GND VDD: ................................................................3.9V ALERT#:...........................................................3.9V ALERT#..............................................