IR3725_11 Datasheet, PDF (1/19 Pages) International Rectifier – INPUT POWER MONITOR WITH DIGITAL INTERFACE

FEATURES
 Accurate power, current, or voltage reporting
 1.5 % maximum power error
 1.0 % maximum current error
 Serial digital interface
 SMBus and I²C compatible
 Programmable averaging interval
 Flexible current sensing
 Resistive or Inductor DCR
 Applications
 Synchronous rectified buck converters
 Multiphase converters
 12pin 3x4 DFN lead free
 RoHS Compliant
IR3725
Data Sheet
INPUT POWER MONITOR
WITH DIGITAL INTERFACE
DESCRIPTION
The IR3725 is a highly configurable power monitor IC
that uses proprietary digital technology to measure a
12V rail current, its voltage, or its average power over a
user specified time interval. Configuration and result
reporting are managed through a serial digital interface.
The current is measured as a voltage across a shunt
resistance, an input inductor, or a copper trace
resistance.
The real time voltage and current signals are multiplied,
digitized, and averaged over a user selectable
averaging interval providing TruePower™ measurement
of highly dynamic loads.
TYPICAL APPLICATION CIRCUIT
+12V
L _DCR
C_CS1
C_CS2
+12V Return
Input
Capacitors
Buck Regulators
3.3V
VDD
IR3725 _I2C
VO ^ALERT#
VCS2
VT
VCS1 ^ADDR
GND
To system
Controller
2
R_{T 0.1 uF}
ORDERING INFORMATION
Device
IR3725MTRPBF
IR3725MPBF
Package
12 lead DFN (4x3 mm body)
12 lead DFN (4x3 mm body)
Order Quantity
3000 piece reel
Sample Quantity
Page 1 of 19
www.irf.com
2011_11_16