Datasheet

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

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PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

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.

FEATURES

● COMPLETE BIDIRECTIONAL CURRENT

MEASUREMENT CIRCUIT

● WIDE SUPPLY RANGE: 2.7V to 40V

● SUPPLY-INDEPENDENT COMMON-MODE

VOLTAGE: 2.7V TO 60V

● RESISTOR PROGRAMMABLE GAIN SET

● LOW QUIESCENT CURRENT: 75µA (typ)

● MSOP-8 PACKAGE

High-Side, Bidirectional

CURRENT SHUNT MONITOR

DESCRIPTION

The INA170 is a high-side, bidirectional current shunt moni-

tor featuring a wide input common-mode voltage range, low

quiescent current, and a tiny MSOP-8 package.

Bidirectional current measurement is accomplished by out-

put offsetting. The offset voltage level is set with an external

resistor and voltage reference. This permits measurement of

a bidirectional shunt current while using a single supply for

the INA170.

Input common-mode and power-supply voltages are inde-

pendent. Input voltage can range from +2.7V to +60V on any

supply voltage from +2.7V to +40V. Low 10µA input bias

current adds minimal error to the shunt current.

The INA170 converts a differential input voltage to a current

output. This current develops a voltage across an external

load resistor, setting any gain from 1 to over 100.

The INA170 is available in an MSOP-8 package, and is

specified over the extended industrial temperature range,

–40°C to +85°C with operation from –55°C to +125°C.

APPLICATIONS

● CURRENT SHUNT MEASUREMENT:

Automotive, Telephone, Computers, Power

Systems, Test, General Instrumentation

● PORTABLE AND BATTERY-BACKUP

SYSTEMS

● BATTERY CHARGERS

● POWER MANAGEMENT

● CELL PHONES

INA170

SBOS193D – MARCH 2001 – REVISED JANUARY 2006

OUT

GND

INA170

REF

V+

SUPPLY

Load

1kΩ

–

All trademarks are the property of their respective owners.

Summary of content (15 pages)

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INA170 SBOS193D – MARCH 2001 – REVISED JANUARY 2006 High-Side, Bidirectional CURRENT SHUNT MONITOR FEATURES DESCRIPTION ● COMPLETE BIDIRECTIONAL CURRENT MEASUREMENT CIRCUIT ● WIDE SUPPLY RANGE: 2.7V to 40V ● SUPPLY-INDEPENDENT COMMON-MODE VOLTAGE: 2.
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ABSOLUTE MAXIMUM RATINGS(1) ELECTROSTATIC DISCHARGE SENSITIVITY Supply Voltage, V+ to GND ................................................. –0.3V to 40V Analog Inputs, Common Mode(2) ......................................... –0.3V to 75V + – Differential (VIN ) – (VIN ) .................................. –40V to 2V Analog Output, Out(2) ........................................................... –0.3V to 40V Input Current Into Any Pin ...............................................................
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ELECTRICAL CHARACTERISTICS + = 12V, R At TA = –40°C to +85°C, VS = 5V, VIN OUT = 25kΩ, unless otherwise noted.
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TYPICAL CHARACTERISTICS + = 12V, R = 25kΩ, unless otherwise noted. At TA = +25°C, V+ = 5V, VIN L COMMON-MODE REJECTION vs FREQUENCY GAIN vs FREQUENCY 40 120 Common-Mode Rejection (dB) RL = 100kΩ 30 RL = 10kΩ Gain (dB) 20 10 RL = 1kΩ 0 –10 –20 G = 100 100 80 G = 10 60 G=1 40 20 0 100 10k 1k 100k 10M 1M 0.
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TYPICAL CHARACTERISTICS (Cont.) + = 12V, R = 25kΩ, unless otherwise noted. At TA = +25°C, V+ = 5V, VIN L STEP RESPONSE STEP RESPONSE 1.5V 1V G = 100 G = 50 0.5V 0V 1V 2V G = 100 G = 10 0V 0V 20µs/div 10µs/div INA170 SBOS193D www.ti.
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OPERATION Figure 1 shows the basic circuit diagram for the INA170. Load current IS is drawn from supply VS through shunt resistor RS. The voltage drop in shunt resistor VS is forced across RG1 by the internal op-amp, causing current to flow into the collector of Q1. External resistor RL converts the output current to a voltage, VOUT, at the OUT pin.
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currents by minimizing the effects of offset, while low values of RS minimize voltage loss in the supply line. For most applications, best performance is attained with an RS value that provides a full-scale shunt voltage of 50mV to 100mV. Maximum input voltage for accurate measurements is 500mV. RL is chosen to provide the desired full-scale output voltage. The output impedance of the INA170 Out terminal is very high which permits using values of RL up to 100kΩ with excellent accuracy.
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IS = ±10A 0.0125Ω +5V Load 28V 0.1µF ∆V = ±125mV Full-Scale 8 1 2 V+ – VIN IO = 125µA ± 125µA + VIN 6 INA170 IOS = 125µA OUT 3 +2.5V RL 10kΩ VREF ROS VOUT = 0 to +2.5V Full-Scale GND 5 4 20kΩ FIGURE 5. Bipolar Current Measurement. 8 INA170 www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 16-Aug-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 INA170EA/250 VSSOP DGK 8 250 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 INA170EA/2K5 VSSOP DGK 8 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 16-Aug-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) INA170EA/250 VSSOP DGK INA170EA/2K5 VSSOP DGK 8 250 366.0 364.0 50.0 8 2500 366.0 364.0 50.
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