Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - current control/management Current monitoring SOIC 8

Single-PoleFilter

Capacitor

+2.7Vto+18V

5kW5kW

96kW

PREOUT BUFIN

GND

OUT

IN-IN+ V+

Load

-16Vto+80V

Supply

INA270

INA271

www.ti.com

SBOS381C –FEBRUARY 2007–REVISED MAY 2010

Voltage Output, Unidirectional Measurement

Current-Shunt Monitor

Check for Samples: INA270, INA271

FEATURES

DESCRIPTION

• WIDE COMMON-MODE RANGE: –16V to +80V

The INA270 and INA271 family of current-shunt

monitors with voltage output can sense drops across

• CMRR: 120dB

current shunts at common-mode voltages from –16V

• ACCURACY:

to +80V, independent of the supply voltage. The

±2.5mV Offset (max)

INA270 and INA271 pinouts readily enable filtering.

±1% Gain Error (max)

The INA270 and INA271 are available with two output

20mV/°C Offset Drift (max)

voltage scales: 14V/V and 20V/V. The 130kHz

55ppm/°C Gain Drift (max)

bandwidth simplifies use in current-control loops.

• BANDWIDTH: Up to 130kHz

The INA270 and INA271 operate from a single +2.7V

• TWO TRANSFER FUNCTIONS AVAILABLE:

to +18V supply, drawing a maximum of 900mA of

14V/V (INA270)

supply current. They are specified over the extended

20V/V (INA271)

operating temperature range of –40°C to +125°C and

• QUIESCENT CURRENT: 900mA (max)

are offered in an SO-8 package.

• POWER SUPPLY: +2.7V to +18V

• PROVISION FOR FILTERING

APPLICATIONS

• POWER MANAGEMENT

• AUTOMOTIVE

• TELECOM EQUIPMENT

• NOTEBOOK COMPUTERS

• BATTERY CHARGERS

• CELL PHONES

• WELDING EQUIPMENT

DEVICE COMPARISON

DEVICE GAIN

INA270 14V/V

INA271 20V/V

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (20 pages)

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INA270 INA271 www.ti.com SBOS381C – FEBRUARY 2007 – REVISED MAY 2010 Voltage Output, Unidirectional Measurement Current-Shunt Monitor Check for Samples: INA270, INA271 FEATURES DESCRIPTION • • • The INA270 and INA271 family of current-shunt monitors with voltage output can sense drops across current shunts at common-mode voltages from –16V to +80V, independent of the supply voltage. The INA270 and INA271 pinouts readily enable filtering.
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INA270 INA271 SBOS381C – FEBRUARY 2007 – REVISED MAY 2010 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure.
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INA270 INA271 www.ti.com SBOS381C – FEBRUARY 2007 – REVISED MAY 2010 ELECTRICAL CHARACTERISTICS Boldface limits apply over the specified temperature range: TA = –40°C to +125°C. At TA = +25°C, VS = +5V, VCM = +12V, VSENSE = 100mV, and PRE OUT connected to BUF IN, unless otherwise noted. INA270, INA271 PARAMETER CONDITIONS MIN TYP MAX UNIT 0.15 (VS – 0.
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INA270 INA271 SBOS381C – FEBRUARY 2007 – REVISED MAY 2010 www.ti.com ELECTRICAL CHARACTERISTICS (continued) Boldface limits apply over the specified temperature range: TA = –40°C to +125°C. At TA = +25°C, VS = +5V, VCM = +12V, VSENSE = 100mV, and PRE OUT connected to BUF IN, unless otherwise noted. INA270, INA271 PARAMETER CONDITIONS MIN TYP MAX UNIT NOISE, RTI (7) Voltage Noise Density en 40 nV/√Hz POWER SUPPLY Operating Range VS Quiescent Current IQ Over Temperature +18 V VOUT = 2V +2.
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INA270 INA271 www.ti.com SBOS381C – FEBRUARY 2007 – REVISED MAY 2010 TYPICAL CHARACTERISTICS At TA = +25°C, VS = +12V, VCM = 12V, and VSENSE = 100mV, unless otherwise noted. GAIN vs FREQUENCY GAIN vs FREQUENCY 45 CLOAD = 1000pF 40 40 35 35 30 Gain (dB) Gain (dB) 45 G = 20 25 G = 14 20 G = 20 25 G = 14 20 15 10 10 5 10k 18 100k 10k 1M Frequency (Hz) Figure 2.
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INA270 INA271 SBOS381C – FEBRUARY 2007 – REVISED MAY 2010 www.ti.com TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS = +12V, VCM = 12V, and VSENSE = 100mV, unless otherwise noted. POSITIVE OUTPUT VOLTAGE SWING vs OUTPUT CURRENT QUIESCENT CURRENT vs OUTPUT VOLTAGE 1000 12 11 10 800 Sourcing Current 9 +25°C 8 700 -40°C +125°C 7 6 VS = 3V 5 Sourcing Current +25°C 4 3 -40°C +125°C 0 0 600 500 400 300 Output stage is designed to source current.
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INA270 INA271 www.ti.com SBOS381C – FEBRUARY 2007 – REVISED MAY 2010 TYPICAL CHARACTERISTICS (continued) At TA = +25°C, VS = +12V, VCM = 12V, and VSENSE = 100mV, unless otherwise noted. PREOUT OUTPUT RESISTANCE PRODUCTION DISTRIBUTION BUFFER GAIN vs FREQUENCY 200 150 Gain (dB) Population Phase 100 50 Gain 80 82 84 86 88 90 92 94 96 98 100 102 104 106 108 110 112 114 116 118 120 0 -50 10 100 1k 10k 100k 1M 10M Frequency (Hz) RPREOUT (kW) Figure 12.
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INA270 INA271 SBOS381C – FEBRUARY 2007 – REVISED MAY 2010 www.ti.com APPLICATIONS INFORMATION BASIC CONNECTION POWER SUPPLY Figure 15 shows the basic connection of the INA270 and INA271. The input pins, IN+ and IN–, should be connected as closely as possible to the shunt resistor to minimize any resistance in series with the shunt resistance. The input circuitry of the INA270 and INA271 can accurately measure beyond its power-supply voltage, V+.
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INA270 INA271 www.ti.com SBOS381C – FEBRUARY 2007 – REVISED MAY 2010 TRANSIENT PROTECTION inputs since the internal gain resistors can vary up to ±30%, but are tightly matched (if gain accuracy is not important, then resistors can be added in series with the INA270 and INA271 inputs with two equal resistors on each input).
PAGE 10
INA270 INA271 SBOS381C – FEBRUARY 2007 – REVISED MAY 2010 www.ti.com ACCURACY VARIATIONS AS A RESULT OF VSENSE AND COMMON-MODE VOLTAGE The accuracy of the INA270 and INA271 current shunt monitors is a function of two main variables: VSENSE (VIN+ – VIN–) and common-mode voltage, VCM, relative to the supply voltage, VS. VCM is expressed as (VIN+ + VIN–)/2; however, in practice, VCM is seen as the voltage at VIN+ because the voltage drop across VSENSE is usually small.
PAGE 11
INA270 INA271 www.ti.com SBOS381C – FEBRUARY 2007 – REVISED MAY 2010 Low VSENSE Case 2: VSENSE < 20mV, 0V ≤ VCM ≤ VS SHUTDOWN This region of operation is the least accurate for the INA270 family. To achieve the wide input common-mode voltage range, these devices use two op amp front ends in parallel. One op amp front end operates in the positive input common-mode voltage range, and the other in the negative input region.
PAGE 12
INA270 INA271 SBOS381C – FEBRUARY 2007 – REVISED MAY 2010 www.ti.com IL RS -16V to +80V Supply Single-Pole Filter Capacitor IN+ Negative and Positive Common-Mode Voltage PRE OUT IN5kW Load BUF IN V+ 5kW V+ > 3V OUT A1 74HC04 0.1mF 96kW A2 RL INA270, INA271 GND Figure 19.
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INA270 INA271 www.ti.com SBOS381C – FEBRUARY 2007 – REVISED MAY 2010 REVISION HISTORY NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision B (July 2008) to Revision C Page • Corrected Figure 17 y-axis ................................................................................................................................................. 10 • Corrected Figure 18 y-axis ..............................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 10-Jun-2014 (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant INA270AIDR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1 INA271AIDR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) INA270AIDR SOIC D 8 2500 367.0 367.0 35.0 INA271AIDR SOIC D 8 2500 367.0 367.0 35.
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