INA310B4IDGKR

Overview

The INA310B4IDGKR is a high-speed current sense amplifier from Texas Instruments featuring a fixed gain of 200 V/V. It operates with a common-mode voltage range from -4 V to +110 V and supports supply voltages between 2.7 V and 20 V. The device offers a signal bandwidth of 900 kHz, a maximum gain error of 0.5%, and an offset voltage of ±200 µV. It includes an integrated open-drain comparator with a 0.6 V reference threshold and latching capability. The component is housed in an 8-pin VSSOP package.

Feature Summary

• Ultra-precise zero-drift architecture for high accuracy
• Wide common-mode voltage range independent of supply
• Integrated open-drain comparator with internal reference
• High signal bandwidth for fast overcurrent protection

Applications

• 48 V DC/DC converter systems
• Battery management systems (BMS)
• Macro remote radio units (RRU)
• 48 V rack server power supplies
• Solenoids and actuators control

Procurement Notes

Verify the specific suffix IDGKR corresponds to the VSSOP-8 tape and reel packaging configuration required for automated assembly. Confirm that the B version specifications align with the system's tolerance requirements for gain error and offset voltage drift across the operating temperature range.

Selection Notes

Select this part when a fixed 200 V/V gain is optimal for the shunt resistor value and desired output swing. The B variant provides higher gain error tolerance compared to the A series but maintains precision suitable for most industrial applications. Ensure the input bias current characteristics meet the leakage requirements of the sensing circuit.

Part Context

This component belongs to the INA310x family of ultra-precise current sense amplifiers. The family shares a common zero-drift topology and integrated comparator functionality. The specific model differs by gain setting and accuracy grade, allowing designers to optimize dynamic range and cost for various high-voltage sensing applications.

Replacement Considerations

Direct replacements within the same family include other INA310B variants with different fixed gains such as INA310B1, INA310B2, INA310B3, or INA310B5. Cross-family replacement requires careful evaluation of bandwidth, CMRR, and comparator threshold differences.

FAQ

How does the RESET pin affect the comparator operation?

When the RESET pin is left open or connected to GND, the comparator operates in transparent mode. When pulled high, it enters latching mode, holding the output high until reset.

What is the typical propagation delay of the integrated comparator?

The small-signal propagation delay is typically 1 µs when the comparator input overdrive is 20 mV.

Can the common-mode voltage exceed the supply voltage?

Yes, the INA310x allows common-mode voltages from -4 V to +110 V regardless of the VS supply voltage, which ranges from 2.7 V to 20 V.