IR3720MTRPBF International Rectifier, IR3720MTRPBF Datasheet

IC POWER SUPPLY MONITOR 10-DFN

IR3720MTRPBF

Manufacturer Part Number
IR3720MTRPBF
Description
IC POWER SUPPLY MONITOR 10-DFN
Manufacturer
International Rectifier
Series
TruePower™r
Datasheet

Specifications of IR3720MTRPBF

Package / Case
10-DFN
Mounting Type
Surface Mount
Current - Supply
480µA
Voltage - Supply
3.135 V ~ 3.465 V
Operating Temperature
0°C ~ 125°C
Applications
Power Supply Monitor
Voltage - Input
-
Input Voltage
3.3V
No. Of Outputs
1
Supply Voltage Range
3.135V To 3.465V
No. Of Pins
10
Operating Temperature Range
0°C To +125°C
Filter Terminals
SMD
Input Voltage Primary Max
3.3V
Rohs Compliant
Yes
Frequency
400kHz
Package
10 Lead 3x3 DFN
Vk Range
0.5V - 1.8V
Bias Supply Voltage
+3.3V +/-5%
Junction Temperature
0oC to 125oC
Pbf
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Input
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
IR3720MTRPBF
Manufacturer:
WIMA
Quantity:
1 200
Company:
Part Number:
IR3720MTRPBF
Quantity:
1 888
FEATURES
TYPICAL APPLICATION CIRCUIT
ORDERING INFORMATION
Device
IR3720MTRPBF
* IR3720MPBF
* Samples only
Page 1 of 20
Accurate TruePower™ monitor
Digital interface
Programmable averaging interval
Flexible current sensing
Applications
10pin 3x3 DFN lead free package
RoHS compliant
Converter
Minimizes dynamic errors
Reports voltage, current, or power
SMBus and I
Resistive or Inductor DCR
Synchronous rectified buck converters
Multiphase converters
Phase
Single
Return
Power
Phase
2
C compatible
R
R
cs1
cs2
L
Package
10 lead DFN (3x3 mm body)
10 lead DFN (3x3 mm body)
www.irf.com
C
DCR
C
CS1
CS2
GND
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 I
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.
Output
Capacitors
Power Monitor IC with
LOAD
Digital I
Order Quantity
3000 piece reel
121 Piece tube
2
C. The output current is
VCS
IR3720
VO
GND
I
2
C Bus
VDD
V
2
REF
C Interface
3.3V
DATA SHEET
To system
Controller
IR3720
R
2
T
09/09/08

Related parts for IR3720MTRPBF

IR3720MTRPBF Summary of contents

Page 1

... Phase R Single Phase Converter Power Return ORDERING INFORMATION Device IR3720MTRPBF * IR3720MPBF * Samples only Page 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 I measured across a current sensing resistor or indirectly across the inductor’ ...

Page 2

ABSOLUTE MAXIMUM RATINGS All voltages referenced to GND VDD: ................................................................3.9V ALERT#:...........................................................3.9V ALERT#.............................................. <VDD + 0.3V EXTCLK ...........................................................3.9V All other Analog and Digital pins ......................3.9V Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These ...

Page 3

PARAMETER DIGITIZER Internal Sampling 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 ...

Page 4

SYSTEM ACCURACY TEST CIRCUIT VDD VDD VREF Bypass Cap R T Page DCR R CS2 C CS2 VCS VDD VO GND www.irf.com IR3720 DATA SHEET ALERT# VO EXTCLK ADDR SDA SCL 09/09/08 ...

Page 5

BLOCK DIAGRAM IC PIN DESCRIPTION NAME NUMBER I/O LEVEL VCS 1 Analog VO 2 Analog VREF 3 Analog GND 4 VDD 5 3.3V EXTCLK 6 3.3V Digital ADDR 7 3.3V Digital SCL 8 3.3V Digital SDA 9 3.3V Digital ALERT# ...

Page 6

IC PIN FUNCTIONS VDD PIN This pin provides operational bias current to circuits internal to the IR3720. Bypass it with a high quality ceramic capacitor to the GND pin. GND PIN This pin returns operational bias current to its source. ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS (System Accuracy Test Circuit, VDD=3 Typical transfer characteristic - Power configuration Average of 8 samples 300 1.8V Ideal Code 0 -300 -0.035 0.000 V (V) DCR Typical ...

Page 8

... I through the inductor. Average power is measured with the aid of International Rectifier’s proprietary TruePower™ circuit. Voltage, current, or the product of voltage Vo and current is digitized over the interval of interest and ported to the OUTPUT register. The VCS pin is maintained at an average voltage equal to Vo ...

Page 9

RESISTOR SENSING APPLICATION The voltage on the shunt resistor of the circuit below is directly proportional to the current from the source. Shunts developing used. Accuracy is enhanced at the higher voltage. Select ...

Page 10

INDUCTOR DCR CURRENT SENSING APPLICATION Referring to the Functional Description Diagram, it can be seen that the shunt function can be accomplished by the DC resistance of the inductor that is already present. Omitting the resistive shunt reduces BOM cost ...

Page 11

THERMAL COMPENSATION FOR INDUCTOR DCR CURRENT SENSING The positive temperature coefficient of the DCR can be compensated if R varies inversely proportional to T the DCR. DCR of a copper coil function of temperature, is approximated by = ...

Page 12

TYPICAL 2-PHASE DCR-SENSING APPLICATION The IR3720 is capable of monitoring power in a multiphase converter. A two-phase circuit is shown below. The voltage output of any phase is equal to that of any and every other phase, and monitored at ...

Page 13

ERROR MANAGEMENT Component value errors external to the IR3720 contribute to power and current measurement error. The power reported by the IR3720 is a function not only of actual power or current, but also of products and quotients of R ...

Page 14

CONFIGURATION REGISTER A configuration register is maintained via the I MFR_SPECIFIC_00 command, code # D0h. The low order nibble (d3, d2, d1, d0) contains a binary number N from zero to eight. The averaging interval milliseconds. N ...

Page 15

OUTPUT REGISTER The output register is loaded with a two’s compliment factor of voltage, current, or power, depending on the last request loaded into the configuration register. I “Direct Data Format” is used. The value of the output register is ...

Page 16

PACKET PROTOCOL S = Start Condition W = Bus write (lo Bus read (hi Acknowledge for ACK, =1 for NACK P = Stop Condition = master to slave = slave to master Bus Write ...

Page 17

PCB PAD AND COMPONENT PLACEMENT The figure below shows suggested pad and component placement. Page www.irf.com 09/09/08 ...

Page 18

SOLDER RESIST The figure below shows the suggested solder resist placement. Page www.irf.com 09/09/08 ...

Page 19

STENCIL DESIGN The figure below shows a suggested stencil design. Page www.irf.com 09/09/08 ...

Page 20

PACKAGE INFORMATION 3X3 MM 10L DFN LEAD FREE IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105 Page Data and specifications subject to change without notice. This product has been designed and ...

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