IR3725 Datasheet, PDF (1/19 Pages) International Rectifier – INPUT POWER MONITOR WITH DIGITAL INTERFACE

FEATURES
„ Accurate power, current, or voltage reporting
ƒ 1.5 % maximum power error
ƒ 1.0 % maximum current error
„ Serial digital interface
ƒ SMBus and I²C compatible
„ Programmable averaging interval
„ Flexible current sensing
ƒ Resistive or Inductor DCR
„ Applications
ƒ Synchronous rectified buck converters
ƒ 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
Input
Capacitors
Buck Regulators
3.3V
VDD
IR3725 _I2C
VO ^ALERT#
VT
VCS2
VCS1 ^ADDR
GND
To system
Controller
2
R_{T 0.1 uF}
+12V Return
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
2008_12_09