IR3721_09 Datasheet, PDF (1/16 Pages) International Rectifier – Power Monitor IC with

IR3721
DATA SHEET
Power Monitor IC with
Analog Output
FEATURES
„ Accurate TruePower^TM 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. An analog voltage
that is proportional to power is realized by connecting
V_K to V_O and connecting an RC filter to DI.
The IR3721 uses Patent Pending TruePower^TM
technology to accurately capture highly dynamic power
waveforms typical of microprocessor loads.
TYPICAL APPLICATION CIRCUIT
ORDERING INFORMATION
Device
IR3721MTRPBF
* IR3721MPBF
*
Samples only
Package
10 lead DFN (3x3 mm body)
10 lead DFN (3x3 mm body)
Page 1 of 16
www.irf.com
Order Quantity
3000 piece reel
121 piece tube
09/15/08