Texas Instruments INA270, INA271A Datasheet

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INA270

INA271

FEATURES DESCRIPTION

APPLICATIONS

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

INA270 INA271

SBOS381A – FEBRUARY 2007 – REVISED APRIL 2007

Voltage Output, Unidirectional Measurement

Current-Shunt Monitor

• 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

20 µ V/ ° C offset drift (max)

output 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 900 µ A 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: 900 µ A (max)

are offered in an SO-8 package.

• POWER SUPPLY: +2.7V to +18V

• PROVISION FOR FILTERING

• 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.

All 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.

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ABSOLUTE MAXIMUM RATINGS

(1)

PIN CONFIGURATION

IN+

(1)

V+

OUT

IN-

GND

PREOUT

BUFIN

INA27x

INA270 INA271

SBOS381A – FEBRUARY 2007 – REVISED APRIL 2007

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. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.

ORDERING INFORMATION

(1)

PACKAGE PACKAGE

PRODUCT PACKAGE-LEAD DESIGNATOR GAIN MARKING

INA270 SO-8 D 14 I270A INA271 SO-8 D 20 I271A

(1) For the most current package and ordering information see the Package Option Addendum at the end of this document, or see the TI

web site at www.ti.com .

INA270, INA271 UNIT

Supply Voltage (VS) +18 V Analog Inputs, V

IN+

, V

IN–

Differential, (V

IN+

) – (V

IN–

) –18 to +18 V

Common-Mode –16 to +80 V

Analog Output:

OUT and PRE OUT Pins GND – 0.3 to (V+) + 0.3 V Input Current Into Any Pin 5 mA Operating Temperature –55 to +150 ° C Storage Temperature –65 to +150 ° C Junction Temperature +150 ° C ESD Ratings:

Human Body Model 3000 V

Charged-Device Model 750 V

(1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may

degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those specified is not supported.

SO-8

Top View

NOTE (1): NC denotes no internal connection.

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ELECTRICAL CHARACTERISTICS

INA270 INA271

SBOS381A – FEBRUARY 2007 – REVISED APRIL 2007

Boldface limits apply over the specified temperature range: TA= –40 ° C to +125 ° C.

At TA= +25 ° C, VS= +5V, V

= +12V, V

SENSE

= 100mV, and PRE OUT connected to BUF IN, unless otherwise noted.

INA270, INA271 PARAMETER CONDITIONS MIN TYP MAX UNIT INPUT

Full-Scale Input Voltage V

SENSE

= (V

IN+

) + (V

IN–

) 0.15 (VS– 0.2)/Gain V

Common-Mode Input Range V

–16 +80 V

Common-Mode Rejection Ratio CMRR V

IN+

= –16V to +80V 80 120 dB

Over Temperature V

IN+

= +12V to +80V 100 120 dB

Offset Voltage, RTI

(1)

± 0.5 2.5 mV

Over Temperature ± 3 mV vs Temperature dV

/dT 2.5 20 µ V/ ° C

vs Power-Supply PSR VS= +2.7V to +18V, VCM= +18V 5 100 µ V/V

Input Bias Current, V

IN–

Pin I

± 8 ± 16 µ A

PRE OUT Output Impedance

(2)

96 k Ω Buffer Input Bias Current –50 nA Buffer Input Bias Current Temperature

± 0.03 nA/ ° C

Coefficient

OUTPUT (V

SENSE

≥ 20mV)

(3)

Gain: INA270 Total Gain G 14 V/V Gain: INA271 Total Gain G 20 V/V Output Buffer Gain G

BUF

2 V/V

Total Gain Error V

SENSE

= 20mV to 100mV ± 0.2 ± 1 %

Over Temperature ± 2 %

vs Temperature 50 ppm/ ° C

Total Output Error

(4)

SENSE

= 20mV to 100mV ± 0.75 ± 2.2 %

Total Output Error ± 1.0 ± 3.0 %

Nonlinearity Error V

SENSE

= 20mV to 100mV ± 0.002 %

Output Impedance, Pin 5 R

1.5 Ω

Maximum Capacitive Load No Sustained Oscillation 10 nF

VOLTAGE OUTPUT

(5)

RL= 10k Ω to GND Swing to V+ Power-Supply Rail (V+) – 0.05 (V+) – 0.2 V Swing to GND

(6)

GND

+ 0.003 V

GND

+ 0.05 V

FREQUENCY RESPONSE

Bandwidth BW C

LOAD

= 5pF 130 kHz

Phase Margin C

LOAD

< 10nF 40 degrees Slew Rate SR 1 V/ µ s Settling Time (1%) t

SENSE

= 10mV to 100mV

, 2 µ s

LOAD

= 5pF

(1) RTI means Referred-to-Input. (2) Initial resistor variation is ± 30% with an additional –2200ppm/ ° C temperature coefficient. (3) For output behavior when V

SENSE

< 20mV, see the Application Information section Accuracy Variations as A Result of V

SENSE

and

Common-Mode Voltage.

(4) Total output error includes effects of gain error and VOS. (5) See typical characteristic curve Output Swing vs Output Current and Application Information section Accuracy Variations as A Result of

SENSE

and Common-Mode Voltage.

(6) Ensured by design; not production tested.

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INA270 INA271

SBOS381A – FEBRUARY 2007 – REVISED APRIL 2007

ELECTRICAL CHARACTERISTICS (continued)

Boldface limits apply over the specified temperature range: TA= –40 ° C to +125 ° C.

At TA= +25 ° C, VS= +5V, V

= +12V, V

SENSE

= 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 e

40 nV/ √ Hz

POWER SUPPLY Operating Range V

+2.7 +18 V

Quiescent Current I

OUT

= 2V 700 900 µ A

Over Temperature V

SENSE

= 0mV 350 950 µ A

TEMPERATURE RANGE

Specified Temperature Range –40 +125 ° C Operating Temperature Range –55 +150 ° C Thermal Resistance θ

SO-8 +150 ° C/W

(7) RTI means Referred-to-Input.

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TYPICAL CHARACTERISTICS

10k

100k

Gain(dB)

Frequency(Hz)

C =1000pF

LOAD

G=14

G=20

10k

100k

Gain(dB)

Frequency(Hz)

G=20

G=14

C =0pF

LOAD

140

130

120

110

100

100 1k 10k

Common-Modeand

ower

-SupplyRejection(dB)

Frequency(Hz)

100k

CMRR

PSR

100

200

300

400

500

600

700

V (V)

OUT

V (mV)

SENSE

800

900

1000

1100

1200

1300

20V/V

14V/V

V =18V

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

100

150 200

250 300

350

TotalOutputError

(%erroroftheidealoutputvalue)

V (mV)

SENSE

400 450

500

0.10

0.09

0.08

0.07

0.06

0.05

0.04

0.03

0.02

0.01

-16

-12

-8

-4 0

4 128

2016

OutputError(%)

Common-ModeVoltage(V)

... 76

INA270 INA271

SBOS381A – FEBRUARY 2007 – REVISED APRIL 2007

At TA= +25 ° C, VS= +12V, V

= 12V, and V

SENSE

= 100mV, unless otherwise noted.

GAIN vs FREQUENCY GAIN vs FREQUENCY

Figure 1. Figure 2.

COMMON-MODE AND POWER-SUPPLY REJECTION

GAIN PLOT vs FREQUENCY

Figure 3. Figure 4.

TOTAL OUTPUT ERROR vs V

SENSE

OUTPUT ERROR vs COMMON-MODE VOLTAGE

Figure 5. Figure 6.

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