Document
®
INA138 INA168
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High-Side Measurement CURRENT SHUNT MONITOR
FEATURES
q COMPLETE UNIPOLAR HIGH-SIDE CURRENT MEASUREMENT CIRCUIT q WIDE SUPPLY AND COMMON-MODE RANGE q INA138: 2.7V to 36V q INA168: 2.7V to 60V q INDEPENDENT SUPPLY AND INPUT COMMON-MODE VOLTAGES q SINGLE RESISTOR GAIN SET q LOW QUIESCENT CURRENT (25µA typ) q SOT23-5 Package
DESCRIPTION
The INA138 and INA168 are high-side, unipolar, current shunt monitors. Wide input common-mode voltage range, low quiescent current, and tiny SOT-23 packaging enable use in a variety of applications. Input common-mode and power supply voltages are independent and can range from 2.7V to 36V for the INA138 and 2.7V to 60V for the INA168. Both models draw only 25µA quiescent current, which also permits connecting the power supply to either side of the current measurement shunt with minimal error. The device converts a differential input voltage to a current output. This current is converted back to a voltage with an external load resistor that sets any gain from 1 to over 100. Although designed for current shunt measurement, the circuit invites creative applications in measurement and level shifting. Both the INA138 and INA168 are available in SOT23-5 and are specified for the –40°C to +85°C industrial temperature range.
APPLICATIONS
q CURRENT SHUNT MEASUREMENT Automotive, Telephone, Computers q PORTABLE & BATTERY BACKUP SYSTEMS q BATTERY CHARGERS q POWER MANAGEMENT q CELL PHONES q PRECISION CURRENT SOURCE
RS VIN+ 3 VIN+ 4 VIN–
IS
Load
5kΩ V+ 5
5kΩ
OUT GND 2 1 RL
VO = ISRSRL/5kΩ
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©1999 Burr-Brown Corporation
PDS-1576A
Printed in U.S.A. December, 1999
SPECIFICATIONS
At TA = –40°C to +85°C, VS = 5V, VIN+ = 12V, ROUT = 125kΩ, unless otherwise noted. INA138 PARAMETER INPUT Full-Scale Sense Voltage Common-Mode Input Range Common-Mode Rejection Offset Voltage(1) vs Temperature vs Power Supply Input Bias Current OUTPUT Transconductance vs Temperature Nonlinearity Error Total Output Error Output Impedance Voltage Output Swing to Power Supply, V+ Swing to Common Mode, VCM FREQUENCY RESPONSE Bandwidth Settling Time (0.1%) NOISE Output-Current Noise Density Total Output-Current Noise POWER SUPPLY Operating Range, V+ Quiescent Current TEMPERATURE RANGE Specification, TMIN to TMAX Operating Storage Thermal Resistance CONDITION
+ – V– VSENSE = VIN IN
INA168 MAX 500 36 MIN TYP V V 100 120 V V 0.1 V 202 ±0.1 ±2 V V V V V V V V V V V V V V 36 45 85 125 150 V V V V V V 60 V V V V MAX V 60 UNITS mV V dB dB mV µV/°C µV/V µV/V uA µA/V nA/°C % % GΩ || pF V V kHz kHz µs µs pA/√Hz nA RMS V µA °C °C °C °C/W
MIN
TYP 100
VIN+ = 2.7V to 40V, VSENSE = 50mV VIN+ = 2.7V to 60V, VSENSE = 50mV TMIN to TMAX V– = 2.7V to 40V, VSENSE = 50mV V– = 2.7V to 60V, VSENSE = 50mV + , V– VIN IN VSENSE = 10mV – 150mV VSENSE = 100mV VSENSE = 10mV to 150mV VSENSE = 100mV
2.7 100
120 ±0.2 1 0.1 2 ±1 10 10 V
198
200 10 ±0.01 ±0.5 1 || 5
V V V
(V+) – 0.8 (V+) – 1.0 VCM – 0.5 VCM – 0.8 R OUT = 5kΩ ROUT = 125kΩ 5V Step, ROUT = 5kΩ 5V Step, ROUT = 125kΩ 800 32 1.8 30 9 3 2.7 VSENSE = 0, IO = 0 –40 –55 –65 25
V V
BW = 100kHz
θJA
200
NOTES: (1) Defined as the amount of input voltage, VSENSE, to drive the output to zero.
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INA138, INA168
2
PIN CONFIGURATION
TOP VIEW SOT
ELECTROSTATIC DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Burr-Brown 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.
OUT GND
+ VIN
1 2 3
5
V+
4
– VIN
ABSOLUTE MAXIMUM RATINGS(1)
Supply Voltage, V+ INA138 ............................................................................... –0.3V to 60V INA168 ............................................................................... –0.3V to 60V + – , VIN Analog Inputs, VIN INA138 Common Mode ............................................................... –0.3V to 40V + – ) ..................................................... –40V to 2V ) – (VIN Differential (VIN INA168 Common Mode ............................................................... –0.3V to 60V + – ) – (VIN ) ..................................................... –40V to 2V Differential (VIN Analog Output, Out .............................................................. –0.3V to 40V Operating Temperature ..................