LT1431IS8#PBF

Voltage Reference Overview

The LT1431IS8#PBF is an adjustable shunt voltage regulator manufactured by Analog Devices Inc. It features a guaranteed 0.4% initial reference voltage tolerance and a typical temperature stability of 0.3%. The device provides a sink current capability ranging from 1mA to 100mA with a nominal internal current limit of 100mA. It operates within a supply voltage range up to 36V and maintains a low reference pin current. The component is housed in an 8-lead plastic SOIC package.

Voltage Reference Feature Summary

• Adjustable shunt voltage regulation with on-chip divider resistors for simplified 5V configuration
• High precision with guaranteed 0.4% initial voltage tolerance and fast turn-on characteristics
• Low dynamic output impedance ensuring stable performance across varying load conditions

Voltage Reference Applications

• Linear regulators
• Adjustable power supplies
• Switching power supplies

Voltage Reference Procurement Notes

Verify the specific suffix #PBF indicates lead-free finish compliance before procurement. Confirm the IS8 designation matches the required 8-lead SOIC package and industrial temperature range specifications. Ensure the ordering information aligns with the manufacturer's current production status and packaging options.

Voltage Reference Selection Notes

Select this component when precise voltage referencing is required with high initial accuracy. The 8-pin SOIC package offers flexibility for compensation via the COMP pin. Consider the 100mA sink capability for driving external pass transistors or regulating higher currents in switching topologies.

Voltage Reference Part Context

This part belongs to the LT1431 series of programmable references. It serves as a high-performance alternative to standard Zener diodes, offering superior temperature stability and lower dynamic impedance. The series includes various packages such as DIP, CERDIP, and TO-92 to suit different thermal and spatial constraints.

Voltage Reference Replacement Considerations

LT1431CS8#PBF

Voltage Reference FAQ

How is the output voltage configured for a fixed 5V regulation?

Connect the RTOP pin to the COLL pin and the RMID pin to the REF pin. This utilizes the on-chip 5k-5k resistive divider to guarantee 1% accuracy without external components.

What is the function of the COMP pin?

The COMP pin acts as the base of the driver for the output transistor. It allows for additional frequency compensation in complex feedback systems and can be used to shut down the regulator if left open or driven appropriately.