IR3725MTRPBF International Rectifier, IR3725MTRPBF Datasheet

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IR3725MTRPBF

Manufacturer Part Number
IR3725MTRPBF
Description
IC PWR MONITOR INPUT 12-DFN
Manufacturer
International Rectifier
Series
TruePower™r
Datasheet

Specifications of IR3725MTRPBF

Applications
Power Supply Monitor
Voltage - Supply
3.135 V ~ 3.465 V
Current - Supply
700µA
Operating Temperature
0°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
12-VFDFN Exposed Pad
Package
12 Lead DFN
Bias Supply Voltage
+3.3V +/-5%
Junction Temperature
0oC to 125oC
Pbf
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Voltage - Input
-
Other names
IR3725MTRPBFTR
FEATURES
TYPICAL APPLICATION CIRCUIT
ORDERING INFORMATION
Device
IR3725MTRPBF
IR3725MPBF
Page 1 of 19
Accurate power, current, or voltage reporting
Serial digital interface
Programmable averaging interval
Flexible current sensing
Applications
12pin 3x4 DFN lead free
RoHS Compliant
1.5 % maximum power error
1.0 % maximum current error
SMBus and I
Resistive or Inductor DCR
Synchronous rectified buck converters
Multiphase converters
+12V Return
+12V
2
C compatible
L
C
CS2
C
CS1
DCR
Input
Capacitors
Package
12 lead DFN (4x3 mm body)
12 lead DFN (4x3 mm body)
www.irf.com
Buck Regulators
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.
INPUT POWER MONITOR
WITH DIGITAL INTERFACE
VO
VCS1
IR3725
VCS2
GND
ALERT#
ADDR
VDD
Order Quantity
3000 piece reel
Sample Quantity
VT
I
2
3.3V
C
To system
Controller
2
R
T
0.1 uF
IR3725
Data Sheet
2008_12_09

Related parts for IR3725MTRPBF

IR3725MTRPBF Summary of contents

Page 1

... L DCR C CS1 C CS2 +12V Return ORDERING INFORMATION Device IR3725MTRPBF IR3725MPBF Page 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 ...

Page 2

ABSOLUTE MAXIMUM RATINGS All voltages referenced to GND VDD: ................................................................3.9V ALERT#:...........................................................3.9V ALERT#............................................. < VDD + 0.3V VCS1, VCS2, VO ...........................................25.0V All other Analog and Digital pins ......................3.9V Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to ...

Page 3

PARAMETER ACCURACY Power measurement error Voltage measurement error Current measurement error NOTES: 1. Guaranteed by design, not tested in production 2. Assumes no error contributed by external components BLOCK DIAGRAM Page TEST CONDITION VO=12V, DCR voltage = ...

Page 4

PIN DESCRIPTION NAME NUMBER I/O LEVEL VCS1 1 Analog 12V VCS2 2 Analog 12V VO 3 Analog 12V VT 4 Analog GND 5 0V VDD 6 3.3V EXTCLK 7 3.3V Digital ADDR 8 3.3V Digital SCL 9 3.3V Digital SDA ...

Page 5

ADDR PIN The ADDR pin is an input that establishes the serial bus address. Valid addresses are selected by grounding, floating, or wiring to VDD the ADDR pin. Table 1, “User Selectable Addresses”, provides a mapping of possible selections. Bypass ...

Page 6

TYPICAL PERFORMANCE CHARACTERISTICS (One device tested using “Resistor Sensing Circuit”, VDD = 3 uses 1.5 k Ω full scale uses R CS1 CS2 Each data point is average of eight samples.) IR3725 ...

Page 7

IR3725 CurrentMode - Error [%] ( 20% 18 12% 10 0.00 0.02 0.04 V [V] DCR IR3725 CurrentMode - ...

Page 8

FUNCTIONAL DESCRIPTION Please refer to the Functional Description Diagram below. Power flow through the inductor is the product of output voltage VO times the inductor current I average voltage V will be developed across the DCR inductor as a result ...

Page 9

RESISTOR CURRENT 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. ...

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 inductor DCR can be compensated if R varies inversely T proportional to the DCR. DCR of a copper coil function of temperature, is approximated by ...

Page 12

ERROR MANAGEMENT Component value errors external to the IR3725 contribute to power and current measurement error. The power reported by the IR3725 is a function not only of actual power or current, but also of products and quotients of R ...

Page 13

CONFIGURATION REGISTER A configuration register is maintained via the serial bus 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. ...

Page 14

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. Serial bus “Direct Data Format” is used. The value of the output register ...

Page 15

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

Page 16

PCB PAD AND COMPONENT PLACEMENT The figure below shows a suggested pad and component placement. Page www.irf.com IR3725 Data Sheet 2008_12_09 ...

Page 17

SOLDER RESIST The figure below shows a suggested solder resist placement. Page www.irf.com IR3725 Data Sheet 2008_12_09 ...

Page 18

STENCIL DESIGN The figure below shows a suggested solder stencil design. Page www.irf.com IR3725 Data Sheet 2008_12_09 ...

Page 19

PACKAGE INFORMATION 12L 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 ...

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