ALM2403QPWPRQ1

Overview

The ALM2403QPWPRQ1 is a dual-channel automotive operational amplifier designed for resolver drive applications. It features a 21-MHz gain bandwidth product and a 50-V/µs slew rate, supporting high-frequency signal processing. The device provides a continuous output current of 500 mA per channel with peak capability. It operates on a wide supply voltage range from 5 V to 24 V (single-supply) or ±2.5 V to ±12 V (dual-supply). Key electrical characteristics include an input offset voltage of ±6 mV typical and low quiescent current of 3.6 mA. Integrated protection includes overtemperature shutdown and separate PMOS/NMOS current limiting.

Feature Summary

• High-output current drive capability of 500 mA per channel replaces discrete op amps and transistors.
• Integrated bidirectional OTF/SH_DN pin enables low IQ shutdown state and alerts on overtemperature events.
• Internal EMI rejection filtering reduces susceptibility to electromagnetic interference across broad frequency spectrum.
• Robust protection mechanisms including thermal shutdown and independent current limiting for both sourcing and sinking.

Applications

• Resolver-based automotive and industrial applications
• Inverter and motor control systems
• Electric power steering (EPS)
• Servo drive power stage modules

Procurement Notes

Verify the specific ordering suffix matches the required package configuration before procurement. Confirm that the component meets AEC-Q100 Grade 1 qualification requirements for your target temperature range. Ensure the design accounts for the 14-pin HTSSOP thermal pad connection to the most negative supply for optimal heat dissipation. Validate that the selected quantity aligns with the manufacturer's standard reel packaging specifications.

Selection Notes

Select this component when high output current drive is required alongside low distortion for analog signal excitation. The device is suitable for designs needing functional-safety documentation support. Consider the 14-pin HTSSOP package if board space minimization is critical compared to larger packages. Verify that the application benefits from the integrated EMI filtering and bidirectional shutdown capabilities rather than external discrete solutions.

Part Context

The ALM2403-Q1 belongs to Texas Instruments' automotive-grade operational amplifier family. It is specifically engineered to provide low-distortion differential high-amplitude excitation for resolver primary coils. The device integrates protection features to enhance system robustness against faults in wire-driven analog signals. Its small form factor allows for reduced solution size in resolver drive signal chains.

Replacement Considerations

ALM2402QPWPRQ1: Dual-channel alternative with lower performance metrics; verify if 500 mA drive is strictly necessary.

FAQ

How does the ALM2403-Q1 handle capacitive loads?

The device remains stable with pure capacitive loads up to approximately 30 pF in unity-gain configurations. Increasing closed-loop gain allows driving larger capacitance. Series resistors can be added to the output to improve stability with larger capacitive loads.

What is the function of the OTF/SH_DN pin?

The OTF/SH_DN pin is bidirectional. Pulling it low places both amplifiers into a low IQ shutdown state. If the junction temperature exceeds safe limits, the pin automatically drives low to alert the application that outputs have turned off due to overtemperature.