1 Features

• 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

2 Applications

• Power Supplies
• Motor Control
• Computers
• Telecom Equipment
• Power Management
• Test and Measurement

3 Description

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.