TPA191A4-SC6R

Overview

The TPA191A4-SC6R is a zero-drift, bi-directional current sense amplifier from 3PEAK. It features a fixed gain of 100 V/V and operates with a supply voltage range of 2.7 V to 36 V. The device supports a wide common-mode input voltage range from −0.3 V to +36 V, independent of the supply rail. Key electrical specifications include a maximum input offset voltage of ±100 μV at VCM = 2.75 V, a typical quiescent current of 80 μA, and an industrial operating temperature range of −40°C to 125°C. It is housed in an SOT363 (SC70-6) package.

Feature Summary

• Zero-drift architecture ensures high accuracy with low offset voltage and minimal temperature drift.
• Wide common-mode voltage range from −0.3 V to 36 V enables flexible high-side and low-side sensing.
• Integrated matched gain resistor network minimizes gain errors and reduces temperature drift.
• Low supply current consumption supports battery-powered and energy-efficient applications.

Applications

• High-side and low-side current sensing
• Battery charger systems
• Power management circuits
• Cell phone chargers
• Wireless chargers

Procurement Notes

Verify the specific suffix SC6R corresponds to the SOT363 package and tape-and-reel configuration. Confirm the A4 designation indicates the 100 V/V gain option. Check for RoHS compliance status as defined by the manufacturer's green product standards. Ensure the ordering part number matches the required gain and package type for system integration.

Selection Notes

Select this component when precise current measurement is required across a wide common-mode voltage range. The 100 V/V gain is suitable for detecting small voltage drops across shunt resistors. Consider the zero-drift technology for applications demanding high accuracy over varying temperatures. Evaluate the low quiescent current for power-sensitive designs.

Part Context

The TPA191 series includes multiple gain options ranging from 20 V/V to 1000 V/V. The TPA191A4 variant specifically provides a gain of 100 V/V. All variants share the same SOT363 package and operational characteristics, differing primarily in their internal gain settings. This allows designers to choose the appropriate amplification factor without changing the physical footprint.

Replacement Considerations

Direct substitutes are not explicitly listed in the provided documentation. Designers should evaluate other zero-drift current sense amplifiers with similar gain, common-mode range, and package dimensions. Verify pin compatibility and electrical specifications before implementing any alternative components.

FAQ

What is the input offset voltage specification for the TPA191A4?

The input offset voltage is specified as ±100 μV maximum at VCM = 2.75 V and VSENSE = 0 mV.

Can the TPA191A4 be used for bidirectional current sensing?

Yes, the device supports bidirectional operation by connecting the REF pin to a reference voltage, typically VS/2.

What is the maximum common-mode voltage supported?

The TPA191A4 supports a common-mode input voltage range from −0.3 V to +36 V, independent of the supply voltage.