Monitor IC. IR3720 Datasheet

IR3720 IC. Datasheet pdf. Equivalent

IR3720 Datasheet
Recommendation IR3720 Datasheet
Part IR3720
Description Power Monitor IC
Feature IR3720; IR3720 DATA SHEET Power Monitor IC with Digital I2C Interface www.datasheet4u.com FEATURES „ Accur.
Manufacture International Rectifier
Datasheet
Download IR3720 Datasheet





International Rectifier IR3720
IR3720
DATA SHEET
www.datasheet4u.com
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
Rcs1
Rcs2
CCS1
CCS2
3.3V
Output
Capacitors
LOAD
VO VDD
IR3720
I2C Bus
VCS VREF
GND
To system
Controller
2
RT
GND
ORDERING INFORMATION
Device
IR3720MTRPBF
* IR3720MPBF
* Samples only
Package
10 lead DFN (3x3 mm body)
10 lead DFN (3x3 mm body)
Order Quantity
3000 piece reel
121 Piece tube
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International Rectifier IR3720
IR3720
DATA SHEET
ABSOLUTE MAXIMUM RATINGS
All voltages referenced to GND
VDD: ................................................................3.9V
www.dAaLtaEshReTet#4:u...c.o..m...................................................... 3.9V
ALERT#.............................................. <VDD + 0.3V
EXTCLK ...........................................................3.9V
All other Analog and Digital pins ......................3.9V
Operating Junction Temperature .... -10°C to 150oC
Storage Temperature Range .......... -65oC to 150oC
Thermal Impedance (θJC)............................ 53°C/W
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 system accuracy test circuit. See notes following table.
PARAMETER
IC SYSTEM ACCURACY
Power accuracy,
IC only
BIAS SUPPLY
VDD Turn-on Threshold, VDDUP
VDD Turn-off Threshold, VDDDN
VDD Operating Current
VDD Shutdown Current
VOLTAGE REFERENCE
VREF Voltage
Reference load, RT
VOLTAGE SENSOR
Voltage error
Voltage, full scale VFS
CURRENT SENSOR
Voltage, Current Gain, VIG
Current range, Io x DCR
Current error
TEST CONDITION
RCS2 = 600 , RT = 25.5 k, VDCR = 20 mV,
VO=1 volt, CCS2 = 1μF
Sampling frequency 512 kHz.
Sampling interval 8 ms, 0OC TJ 85OC
Notes 1, 2
RT = 25.5 k
Config Reg enable bit d4=1
RT = 25.5 k
Note 1
VO=1V; VDCR=0 mV, 0OC TJ 85OC
RCS2=600 , RT=25.5 k, Note 1
RT = 25.5 k
RCS2=600 , RT=25.5 k
VO=1V; VDCR=20 mV, 0OC TJ 85OC
RCS2=600 , RT=25.5 K, Note 1
MIN
2.4
1.4
20
-0.75
-35
-2.4
TYP
480
17
1.5
25.5
1.854
1.5
MAX
3.3
3.1
660
100
1.6
40
0.75
35
2.4
UNIT
%
V
V
μA
μA
V
k
%
V
V
mV
%
Page 2 of 20
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09/09/08



International Rectifier IR3720
IR3720
DATA SHEET
PARAMETER
DIGITIZER
www.dIanttaesrhneaetl4Su.acmompling frequency
External Sampling frequency
Transition time
POWER INFORMATION
Minimum Averaging Interval
Maximum Averaging Interval
Output Register
Measuring power
Output Register
Measuring power
Output Register
Measuring power
Output Register
Measuring power
Full Scale Output Register
Measuring power
DIGITAL INPUT AND OUTPUT
ALERT# pull down resistance
SDA & SCL HIGH Level
SDA & SCL Low Level
SCL Input current
SDA pull down voltage
TIMING
Maximum Frequency
Bus free time between stop and
start TBUF
Hold time after (repeated) start
condition THD:STA
Repeated start condition setup
time TSU:STA
Stop condition setup time TSU:STO
Data hold time THD:DAT
Data setup time TSU:DAT
Clock low period TLOW
Clock high period THIGH
Clock or data fall time TF
Clock or data rise time TR
TEST CONDITION
Driven from internal clock
Driven from external clock
Driven from external clock Note 1
Config Reg [d3..d0] = b‘0000, Note 1
Config Reg [d3..d0] = b‘1000, Note 1
VO=1V; VDCR=20 mV
RCS2=600 , RT=25.5 k, Note 1,2
VO=0.5V; VDCR=20 mV
RCS2=600 , RT=25.5 k, Note 1,2
VO=1V; VDCR=0 mV
RCS2=600 , RT=25.5 k, Note 1,2
VO=1V; VDCR=-8 mV
RCS2=600 , RT=25.5 k, Note 1,2
VO = 1.8; VDCR=35 mV
RCS2=600 , RT=25.5 k, Note 1,2
Sink 3 mA
Note 1
Note 1
Note 1
Sink 4 mA Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
Note 1
NOTE:
1. Guaranteed by design, not tested in production
2. Average of eight data samples
MIN TYP MAX UNIT
435 512 589 kHz
922 1024 1126 kHz
50 ns
0.9
230
1380
1
256
1440
1.1
282
1500
ms
ms
HEX
0980 0A00 0A80 HEX
FF40 0000 00C0 HEX
F740 F800 F8C0 HEX
3DC0 3F80 4000 HEX
250 Ω
2.1 V
0.8 V
-5 +5 uA
0.4 V
10 400 kHz
1.3 us
0.6 us
0.6 us
0.6 us
300 ns
100 ns
1.3 us
0.6 us
20 300 ns
20 300 ns
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