SBOSAD1 May   2024 INA791B

ADVANCE INFORMATION  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Integrated Shunt Resistor
      2. 6.3.2 Safe Operating Area
      3. 6.3.3 Short-Circuit Duration
      4. 6.3.4 Temperature Stability
    4. 6.4 Device Functional Modes
      1. 6.4.1 Adjusting the Output With the Reference Pin
        1. 6.4.1.1 Reference Pin Connections for Unidirectional Current Measurements
        2. 6.4.1.2 Ground Referenced Output
        3. 6.4.1.3 Reference Pin Connections for Bidirectional Current Measurements
        4. 6.4.1.4 Output Set to Mid-Supply Voltage
      2. 6.4.2 Adjustable Gain Set Using External Resistors
        1. 6.4.2.1 Adjustable Unity Gain
      3. 6.4.3 Thermal Alert Function
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Calculating Total Error
        1. 7.1.1.1 Error Sources
        2. 7.1.1.2 Reference Voltage Rejection Ratio Error
        3. 7.1.1.3 External Adjustable Gain Error
        4. 7.1.1.4 Total Error Example 1
        5. 7.1.1.5 Total Error Example 2
        6. 7.1.1.6 Total Error Example 3
    2. 7.2 Typical Applications
      1. 7.2.1 High-Side, High-Drive, Solenoid Current-Sense Application
        1. 7.2.1.1 Design Requirements
  9. 8 Power Supply Recommendations
  10. 9 Layout Example
  11. 10Layout Guidelines
  12. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  13. 12Revision History
  14. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

5.5 Electrical Characteristics

at TA = 25°C, VS = 5V, ISENSE = IS+ = 0A, VCM = 48V, VFB = VOUT, and VREF = VS / 2 (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
INPUT
VCM Common-mode input range VIN+ = –4V to 110V, ISENSE = 0A,
TA = –40°C to +125°C		 –4 110 V
CMRR Common-mode rejection ratio VIN+ = –4V to 110V, ISENSE = 0A,
TA = –40°C to +125°C, INA791A		 ±25 ±79 µA/V
VIN+ = –4V to 110V, ISENSE = 0A,
TA = –40°C to +125°C, INA791B		 ±790 ±2500
CMRR Common-mode rejection ratio f = 50kHz ±56 mA/V
Ios Offset current, input referred ISENSE = 0A, INA791A ±5 ±30 mA
ISENSE = 0A, INA791B ±62.5 ±375
dIos/dT Offset current drift ISENSE = 0A, 
TA = –40°C to +125°C, INA791A		 0.125 ±0.625 mA/°C
ISENSE = 0A, 
TA = –40°C to +125°C, INA791B		 0.250 ±1.25
PSRR Power supply rejection ratio VS = 2.7V to 5.5V, VREF = 1V, ISENSE = 0A, INA791A 0.25 ±2.5 mA/V
VS = 2.7V to 5.5V, VREF = 1V, ISENSE = 0A, INA791B 2.5 ±25
IB Total input bias current IB++ IB-, ISENSE = 0A ±50 ±80 ±100 µA
IFB Feed-back current ISENSE = 0A ±1.3 nA
ISENSE = 0A, TA = –40°C to +125°C ±5
INTEGRATED SHUNT RESISTOR
RSHUNT Internal Kelvin shunt resistance IN+ to IN-, TA = 25°C 350 400 500 µΩ
Pin to pin package resistance IS+ to IS-, TA = 25°C 450 560 650 µΩ
Pin to pin package inductance IS+ to IS-, TA = 25°C 2 nH
ISENSE Maximum Continuous Current TA = –40°C to +125°C ±50 A
Short time overload change ISENSE = 120A for 5 seconds ± 0.05 %
Change due to temperature cycle –65°C to 150°C, 500 cycles ± 0.1 %
Shunt resistance change to solder heat 260°C solder, 10 seconds ± 0.1 %
High temperature exposure change 1000 hours, TA = 150°C ± 0.15 %
OUTPUT
G Gain  INA791A, INA791B, 20 mV/A
G System Gain error (shunt + amplifier) (1) GND + 50mV ≤ VOUT  ≤ VS – 200mV,
TA = 25°C, INA791A		 ±0.05 ±0.35 %
GND + 50mV ≤ VOUT  ≤ VS – 200mV,
TA = 25°C, INA791B		 ±0.1 ±1
G System Gain error (shunt + amplifier) TA = –40°C to +125°C, INA791A ±0.5 ±35 ppm/°C
TA = –40°C to +125°C, INA791B ±10 ±75
Non-Linearity Error GND + 10mV ≤ VOUT ≤ VS – 200mV ±0.01 %
RVRR Reference voltage rejection ratio (input - referred) ±2.5 ±12.5 mA/V
Maximum capacitive load No sustained oscillation 0.5 nF
VOLTAGE OUTPUT
Swing to Vs Power Supply Rail RL = 10kΩ to GND, VREF = VS, Adjustable Gain = 4, TA = –40°C to +125°C VS – 0.05 VS – 0.2 V
Swing to Ground RL = 10kΩ to GND, Adjustable Gain = 4, VREF = GND, TA = –40°C to +125°C VGND + 5 VGND + 20 mV
Swing to Ground RL = 10kΩ to GND, VREF = GND, TA = –40°C to +125°C VGND + 1 VGND + 5 mV
FREQUENCY RESPONSE
BW Bandwidth (current sense amplifier) –3dB Bandwidth, VFB = VOUT   1 MHz
–3dB Bandwidth, Adjustable Gain = 4   0.5 MHz
Settling time (current sense amplifier input to out) VIN+, VIN- = 48V, VOUT = 1.5V to 3.5V,
Output settles to 1%		 1.5 µs
VIN+, VIN- = 48V, Adjustable Gain = 4, VOUT = 0.5V to 4.5V, Output settles to 1% 2.5 µs
VIN+, VIN- = 48V, VOUT = 1.5V to 3.5V,
Output settles to 5%		 1 µs
VIN+, VIN- = 48V, Adjustable Gain = 4, VOUT = 0.5V to 4.5V, Output settles to 5% 2 µs
SR Slew Rate VFB = VOUT 1.8 V/µs
Adjustable Gain = 4 1.5 V/µs
NOISE
Current Noise Density 150 µA/√Hz
POWER SUPPLY
IQ Quiescent current 3.5 3.75 mA
TA = –40°C to +125°C 4 mA
TEMPERATURE
Alert Thermal Alert Threshold Rpullup = 10kΩ,  160 °C
AlertLO Thermal Alert Threshold Swing to Ground Rpullup = 10kΩ,  200 mV
(1) ISENSE = ± 50A, VOUT = VREF ± 1V