MAX5391NATE+

Overview

The MAX5391NATE+ is a dual 256-tap volatile digital potentiometer with a 100kΩ end-to-end resistance. It operates from a single +1.7V to +5.5V supply and features an SPI-compatible interface. The device includes two independent voltage-divider circuits, each with 256 programmable tap positions. Key electrical specifications include a maximum wiper resistance of 200Ω, a typical quiescent supply current of 12μA at 1.7V, and a low temperature coefficient of 35ppm/°C. It is housed in a 16-pin 3mm x 3mm TQFN package with an exposed paddle.

Feature Summary

• Dual 256-tap linear taper digital potentiometers
• SPI-compatible serial interface (CS, DIN, SCLK)
• Low 12μA quiescent supply current
• Internal charge pump for low-voltage operation down to 1.7V

Applications

• Low-voltage battery applications
• Portable electronics
• Mechanical potentiometer replacement
• Offset and gain control
• Adjustable voltage references and linear regulators

Procurement Notes

Verify the component is lead-free and RoHS-compliant as indicated by the '+' suffix. Confirm the package type is the 16-pin TQFN-EP and the resistance value is 100kΩ. Ensure the source provides valid datasheets confirming the specific ordering code MAX5391NATE+.

Selection Notes

Select this part for designs requiring dual independent digital potentiometers in a small footprint. The 100kΩ resistance value suits high-impedance signal paths. Verify that the system can tolerate volatile memory behavior, as settings are lost upon power loss. Ensure the SPI controller supports the required clock speeds up to 10MHz.

Part Context

This component belongs to the MAX5391/MAX5393 family of low-voltage digital potentiometers. The MAX5391 variant specifically utilizes a 16-pin TQFN package, whereas the MAX5393 uses a 14-pin TSSOP. Both families share identical electrical characteristics and functionality but differ in physical packaging.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.