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Reference Design
INA250A1, INA250A2, INA250A3, INA250A4
SBOS511B – APRIL 2015 – REVISED DECEMBER 2015
INA250 36-V, Low- or High-Side, Bidirectional, Zero-Drift Current-Shunt Monitor with Precision Integrated Shunt Resistor
1 Features
•1 Precision Integrated Shunt Resistor: – Shunt Resistor: 2 mΩ – Shunt Resistor Tolerance: 0.1% (Max) – 15 A Continuous from –40°C to 85°C – 0°C to 125°C Temperature Coefficient: 10 ppm/°C
• High Accuracy: – Gain Error (Shunt and Amplifier): 0.3% (Max) – Offset Current: 50 mA (Max, INA250A2)
• Four Available Gains: – INA250A1: 200 mV/A – INA250A2: 500 mV/A – INA250A3: 800 mV/A – INA250A4: 2 V/A
• Wide Common-Mode Range: –0.1 V to 36 V • Specified Operating Temperature: –40°C to 125°C
2 Applications
• Test Equipment • Power Supplies • Servers • Telecom Equipment • Automotive • Solar Inverters • Power Management
3 Description
The INA250 is a voltage-output, current-sensing amplifier family that integrates an internal shunt resistor to enable high-accuracy current measurements at common-mode voltages that can vary from 0 V to 36 V, independent of the supply voltage. The device is a bidirectional, low- or highside current-shunt monitor that allows an external reference to be used to measure current flowing in both directions through the internal current-sensing resistor sensor. The integration of the precision current-sensing resistor provides calibration equivalent measurement accuracy with ultra-low temperature drift performance and ensures an optimized Kelvin layout for the sensing resistor is always obtained.
The INA250 family is available in four output voltage scales: 200 mV/A, 500 mV/A, 800 mV/A, and 2 V/A. This device is fully tested and specified for continuous currents up to 10 amps at the maximum temperature of 125°C. The INA250 operates from a single 2.7-V to 36-V supply and draws a maximum of 300 µA of supply current. All INA250 gain versions are specified over the extended operating temperature range (–40°C to 125°C), and are available in a TSSOP-16 package.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
INA250A1
INA250A2 INA250A3
TSSOP (16)
5.00 mm × 4.40 mm
INA250A4
(1) For all available packages, see the orderable addendum at the end of the datasheet.
Power Rail (0 V to 36 V)
Simplified Schematic
Device Supply (2.7 V to 36 V)
CBYPASS 0.1 PF
IN+ SH+
VIN+
+
VS REF
OUT
IN SH Load
VIN
GND
ADC
Microcontroller ADC
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA.
INA250A1, INA250A2, INA250A3, INA250A4
SBOS511B – APRIL 2015 – REVISED DECEMBER 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1 2 Applications ........................................................... 1 3 Description ............................................................. 1 4 Revision History..................................................... 2 5 Pin Configuration and Functions ......................... 3 6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4 6.2 ESD Ratings.............................................................. 4 6.3 Recommended Operating Conditions....................... 4 6.4 Thermal Information .................................................. 4 6.5 Electrical Characteristics........................................... 5 6.6 Typical Characteristics .............................................. 7 7 Detailed Description ............................................ 12 7.1 Overview ................................................................. 12 7.2 Functional Block Diagram ....................................... 12 7.3 Feature Description................................................. 12
7.4 Device Functional Modes........................................ 15 8 Applications and Implementation ...................... 19
8.1 Application Information............................................ 19 8.2 Typical Applications ................................................ 19 9 Power Supply Recommendations...................... 23 10 Layout................................................................... 24 10.1 Layout Guidelines ................................................. 24 10.2 Layout Examples................................................... 24 11 Device and Documentation Support ................. 26 11.1 Documentation Support ....................................... 26 11.2 Related Links ........................................................ 26 11.3 Community Resources.......................................... 26 11.4 Trademarks ........................