MAX4378HAUD+T

Instrumentation, Op Amps, Buffer Amps Overview

The MAX4378HAUD+T is a quad high-side current-sense amplifier from the MAX437x family, manufactured by Analog Devices/Maxim Integrated. It features an internal fixed gain of +100V/V and operates within a supply voltage range of +3V to +28V. The device provides buffered voltage outputs capable of driving up to 2mA into ground-referenced loads. It supports a common-mode input range of 0V to +28V, independent of the supply voltage. Key electrical characteristics include a bandwidth of 1.2MHz at +100V/V gain, a slew rate of 10V/µs, and a typical full-scale accuracy of ±0.5%. It functions over an automotive temperature range of -40°C to +125°C.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Integrated high-side current sensing with a fixed internal gain of +100V/V, eliminating external gain-setting resistors.
• Operates with a wide common-mode input range from 0V to +28V, allowing monitoring even during deep battery discharge.
• Provides buffered voltage outputs with sufficient drive capability for direct connection to analog-to-digital converters or control loops.
• Qualified for automotive applications and designed to function reliably across the extended industrial temperature range.

Instrumentation, Op Amps, Buffer Amps Applications

• Battery chargers and smart battery packages
• Current-limited power supplies
• Portable and battery-powered systems
• Automotive current detection

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific suffix 'AUD' corresponds to the 14-pin TSSOP package and '+T' indicates tape-and-reel packaging. Confirm RoHS compliance status via the manufacturer's ordering information table. Ensure the selected variant matches the required gain (+100V/H) and channel count (Quad). Check for any automotive qualification requirements if applicable to the end application.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component when a quad-channel solution is required for high-side current monitoring in space-constrained designs. The +100V/V gain is suitable for detecting small sense voltages across low-value shunt resistors. Consider the 1.2MHz bandwidth limitation compared to lower-gain variants if higher frequency response is needed. Verify that the output swing can accommodate the system's reference voltage levels.

Instrumentation, Op Amps, Buffer Amps Part Context

This part belongs to the MAX4376/MAX4377/MAX4378 family of precision high-side current-sense amplifiers. The MAX4378 specifically denotes the quad-channel version, offering four independent amplifiers in a single package. It shares core architecture with the single (MAX4376) and dual (MAX4377) variants but provides higher integration density for multi-rail or multi-phase monitoring systems.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

Direct substitutes within the same family include MAX4378FASD+T (Gain +50V/V, SOIC-14) and MAX4378TAUD+T (Gain +20V/V, TSSOP-14). Cross-family replacements require matching gain, package type, and common-mode voltage specifications.