INA310A4IDGKR

Overview

The INA310A4IDGKR is an ultra-precise current sense amplifier from Texas Instruments, featuring a fixed gain of 200 V/V. It operates with a wide common-mode voltage range from -4 V to +110 V and supports survival voltages up to +120 V. The device offers high signal bandwidth of 1.3 MHz and excellent CMRR of 160 dB typical. It includes an integrated open-drain comparator with a 0.6 V internal reference and latching capability. Powered by a single supply from 2.7 V to 20 V, it draws 1.6 mA quiescent current and is housed in an 8-pin VSSOP package.

Feature Summary

• Ultra-precise zero-drift architecture for high accuracy current sensing
• Wide common-mode input range independent of supply voltage
• Integrated open-drain comparator with latching functionality
• High-speed response suitable for fast overcurrent protection

Applications

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

Procurement Notes

Verify the specific ordering suffix IDGKR corresponds to the VSSOP-8 package variant required for your PCB layout. Confirm that the A-grade version meets the strict offset voltage and gain error specifications necessary for your precision application requirements before finalizing component selection.

Selection Notes

Select this part when a fixed 200 V/V gain is optimal for the expected shunt voltage drop. Ensure the system requires operation within the -4 V to +110 V common-mode range. Verify that the 1.3 MHz bandwidth aligns with the transient detection speed needed for overcurrent protection circuits in the target design.

Part Context

This component belongs to the INA310x family of current sense amplifiers designed for high-voltage applications. The 'A' designation indicates the higher precision grade with lower offset voltage and drift compared to the 'B' grade. The '4' suffix specifies the 200 V/V gain configuration, distinguishing it from other gain options like 20, 50, 100, or 500 V/V available in the series.

Replacement Considerations

Direct replacements must match the 200 V/V gain and VSSOP-8 package. Consider the INA310B4 for cost-sensitive designs if the relaxed accuracy specifications are acceptable. Ensure any substitute maintains the same common-mode voltage range and comparator functionality for pin-compatible integration.

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 maximum common-mode voltage the device can survive?

The INA310A4IDGKR can survive common-mode voltages up to +120 V, although its operational range is specified from -4 V to +110 V.

Can the gain be adjusted externally?

No, the closed-loop gain is set internally by a precision resistor network. TI does not recommend adding external resistance to change the effective gain due to potential variation issues.