UC3910N

ADCs/DACs - Special Purpose Overview

The UC3910N is a precision reference and voltage monitor circuit designed for Intel Pentium Pro and high-end microprocessor power supplies. It integrates a 5V reference, a 4-bit DAC, and programmable window comparators. The device converts 5VDC to an adjustable output from 2.0VDC to 3.5VDC in 100mV steps with 1% DC system accuracy when used with the UC3886 PWM controller. Key electrical parameters include a startup threshold of 7V to 9V, supply current of 2mA to 12mA depending on VCC, and a DAC/reference combined error of ±0.9%. It features undervoltage lockout (UVLO) with 50mV to 500mV hysteresis.

ADCs/DACs - Special Purpose Feature Summary

• Integrated precision 5V reference capable of sourcing 10mA
• 4-bit digital-to-analog converter (DAC) with 100mV resolution
• Programmable undervoltage and overvoltage fault windows
• Overvoltage comparator with complementary SCR driver

ADCs/DACs - Special Purpose Applications

• Intel Pentium Pro processor power supplies
• High-end microprocessor power regulation
• DC/DC converters using UC3886 PWM controllers

ADCs/DACs - Special Purpose Procurement Notes

Verify the procurement status as the datasheet lists the UC3910N as NRND (Not Recommended for New Designs). Confirm availability through authorized distributors and check for RoHS compliance details such as the G4 suffix if required. Ensure the package type matches the design requirements, specifically the PDIP-16 configuration.

ADCs/DACs - Special Purpose Selection Notes

Select the UC3910N for applications requiring precise voltage monitoring and adjustment for microprocessor cores. Ensure the design accommodates the 4-bit DAC control logic via D0-D3 pins. Verify that the external resistor divider network correctly sets the OV/UV thresholds within the specified ratio range of 0.3 to 0.9.

ADCs/DACs - Special Purpose Part Context

The UC3910N belongs to the UC1910/UC2910/UC3910 family, differentiated by temperature ranges. The UC3910 operates from 0°C to 70°C. It is often paired with the UC3886 Average Current Mode PWM Controller IC to form a complete power supply solution for high-performance processors.

ADCs/DACs - Special Purpose Replacement Considerations

Public confirmed substitute part numbers are not explicitly listed in the provided datasheet text. Designers should consult Texas Instruments for current alternatives or verify compatibility with successor devices in the UC39xx series.