INA225 - 36V Pin Selectable-Gain, Bi-Directional, High-Speed, Voltage Output Current-Sense Amp

The INA225 is a voltage-output, current-sense amplifier that senses drops across current-sensing resistors at common-mode voltages that can vary from 0 V to 36 V, independent of the supply voltage. The device is a bidirectional, current-shunt monitor that allows an external reference to be used to measure current flowing in both directions across a current-sensing resistor.

Four discrete gain levels are selectable using the two gain-select terminals (GS0 and GS1) to program gains of 25 V/V, 50 V/V, 100 V/V, and 200 V/V. The low-offset, zero-drift architecture and precision gain values enable current-sensing with maximum drops across the shunt as low as 10 mV of full-scale while maintaining very high accuracy measurements over the entire operating temperature range.

The device operates from a single +2.7-V to +36-V power supply, drawing a maximum of 350 µA of supply current. The device is specified over the extended operating temperature range (–40°C to +125°C), and is offered in an MSOP-8 package.

• Wide Common-Mode Range: 0 V to 36 V
• Offset Voltage: ±150 µV (Max, All Gains)
• Offset Voltage Drift: 0.5 µV/°C (Max)
• Gain Accuracy, Over Temperature (Max):
  • 25 V/V, 50 V/V: ±0.15%
  • 100 V/V: ±0.2%
  • 200 V/V: ±0.3%
  • 10-ppm/°C Gain Drift
• 250-kHz Bandwidth (Gain = 25 V/V)
• Programmable Gains:
  • G1 = 25 V/V
  • G2 = 50 V/V
  • G3 = 100 V/V
  • G4 = 200 V/V
• Quiescent Current: 350 µA (Max)
• Package: MSOP-8