Power Monitor. IR3721 Datasheet

IR3721 Monitor. Datasheet pdf. Equivalent

IR3721 Datasheet
Recommendation IR3721 Datasheet
Part IR3721
Description Power Monitor
Feature IR3721; IR3721 DATA SHEET Power Monitor IC with Analog Output FEATURES „ Accurate TruePowerTM monitor • 2.5.
Manufacture International Rectifier
Datasheet
Download IR3721 Datasheet





International Rectifier IR3721
IR3721
DATA SHEET
Power Monitor IC with
Analog Output
FEATURES
„ Accurate TruePowerTM 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
VK to VO and connecting an RC filter to DI.
The IR3721 uses Patent Pending TruePowerTM
technology to accurately capture highly dynamic power
waveforms typical of microprocessor loads.
TYPICAL APPLICATION CIRCUIT
ORDERING INFORMATION
Device
IR3721MTRPBF
* IR3721MPBF
Package
10 lead DFN (3x3 mm body)
10 lead DFN (3x3 mm body)
* Samples only
Page 1 of 16
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Order Quantity
3000 piece reel
121 piece tube
09/15/08



International Rectifier IR3721
IR3721
DATA SHEET
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings (Referenced to GND)
VDD:................................................................. 3.9V
All other Analog and Digital pins ......................3.9V
Operating Junction Temperature .... -10°C to 150°C
Storage Temperature Range .......... -65°C to 150°C
ESD Rating ............HBM Class 2 JEDEC Standard
MSL Rating ..................................................Level 2
Reflow Temperature ..................................... 260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
These are stress ratings only and functional operation of the device at these or any other conditions beyond those
indicated in the operational sections of the specifications are not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply: VDD = 3.3V ± 5%, 0oC TJ 125oC, 0.5 Vo 1.8 V, and
operation in the typical application circuit. See notes following table.
PARAMETER
BIAS SUPPLY
VDD Turn-on Threshold, VDDUP
VDD Turn-off Threshold, VDDDN
VDD UVLO Hysteresis
VDD Operating Current, ICC
VOLTAGE REFERENCE
VRT Voltage
RT resistance range
ΔΣ CONVERTER
Vo common mode range
Duty Ratio Accuracy
Duty Ratio Accuracy
Sampling frequency, fCLK
Comparator Offset
CS pin input current, ICS
DIGITAL OUTPUT
VK pin voltage range
DI source resistance
NOTES:
1. Guaranteed by design
TEST CONDITION
DI output low when off
RT = 25.5k
Note 1
VDCR=20 mV, VO=1V,
RT=25.5k, RCS1+RCS2=600
Tj=65°C, Note 1
VDCR=20 mV, VO=1V,
RT=25.5k, RCS1+RCS2=600 ,
Note 1
DI output low
MIN TYP MAX UNIT
3.10 V
2.4 V
75 mV
350 450
μA
1.452 1.493 1.535
25.5
V
kΩ
0.5 1.8 V
2.5 %
4%
435 512 589
-0.5 +0.5
-250
+250
kHz
mV
nA
0.5 1.8
1250 2000 3000
V
Ω
Page 2 of 16
www.irf.com
09/15/08



International Rectifier IR3721
BLOCK DIAGRAM
VDD
VO VO result out
VCS
VRT
IREF IREF
TruePower
VCS
result out/
IR3721
GND
IR3721
DATA SHEET
VK
DI
IC PIN DESCRIPTION
NAME
VCS
VO
VRT
GND
VDD
GND
GND
DI
VK
VDD
BASE PAD
NUMBER
1
2
3
4
5
6
7
8
9
10
I/O LEVEL
Analog
Analog
Analog
3.3V
Analog
1.8V
3.3V
DESCRIPTION
Current sensing input, connect through resistor to sensing node
Current sensing reference connect to output voltage
RT thermistor network from this pin to GND programs thermal monitor
Bias return and signal reference
IC bias supply
Connect to pin 4
Connect to pin 4
Power Monitor output; connect to output filter
Connect to fixed voltage or VO, multiplied by DI to become analog output
Connect to pin 5
Connect to pin 4
Page 3 of 16
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09/15/08





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