IR3720 Datasheet, PDF (1/20 Pages) International Rectifier – Power Monitor IC withDigital I2C Interface

IR3720
DATA SHEET
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
Power Monitor IC with
Digital I²C Interface
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
Power
Return
DCR
L
R_cs1
R_cs2
C_CS1
C_CS2
3.3V
Output
Capacitors
LOAD
VO VDD
IR3720
I²C Bus
VCS ^VREF
GND
To system
Controller
2
R_T
GND
ORDERING INFORMATION
Device
IR3720MTRPBF
* IR3720MPBF
Package
10 lead DFN (3x3 mm body)
10 lead DFN (3x3 mm body)
* Samples only
Order Quantity
3000 piece reel
121 Piece tube
Page 1 of 20
www.irf.com
09/09/08