TS4436AICT

Overview

The TS4436AICT is a four-terminal shunt voltage reference IC manufactured by STMicroelectronics, designed for low-voltage Switch Mode Power Supplies (SMPS). It integrates a 0.6V internal reference, an amplifier, and an open-collector output transistor. The device maintains feedback voltage at the REF pin in closed-loop configurations. Key electrical parameters include a minimum output voltage of 0.6V, a maximum adjustable output of 1.8V, and a typical supply current consumption of 150µA. It features a temperature coefficient of 150ppm/°C and an accuracy tolerance of ±0.5%. The component operates within a supply voltage range starting at 1.7V and supports an industrial temperature range from -40°C to +105°C.

Feature Summary

• Integrates a precision 0.6V internal voltage reference with an amplifier and open-collector output transistor in a single package.
• Features ultra-low saturation voltage between the sink terminal and ground, facilitating direct series connection with optocouplers.
• Maintains desired feedback voltage in closed-loop SMPS applications by sinking current proportional to the error voltage at the REF pin.

Applications

• Low voltage Switch Mode Power Supplies (SMPS) regulation
• Feedback control circuits requiring precise voltage referencing
• Optocoupler interface stages in isolated power converters

Procurement Notes

Verify the specific suffix 'A' indicates the ±0.5% tolerance grade when sourcing, as standard variants may differ. Confirm the SC-70-5 or TSSOP-5 package availability matches your PCB footprint requirements. Ensure the operating environment stays within the specified -40°C to +105°C industrial temperature range for guaranteed performance. Cross-reference the datasheet revision date to ensure compatibility with your design specifications.

Selection Notes

Select the TS4436AICT when designing low-voltage SMPS architectures requiring output regulation up to 1.8V. Its low supply current makes it suitable for battery-powered or energy-efficient systems. The open-collector output allows flexible interfacing with various logic levels. Consider the ±0.5% accuracy for applications demanding tighter voltage stability compared to standard tolerance devices.

Part Context

The TS4436 series serves as a low-cost alternative to traditional three-terminal references like the TL431 in low-voltage applications. Unlike standard references, it is optimized for operation down to 1.7V, enabling regulation of outputs below 2V. The integration of the reference and driver reduces component count in compact power supply designs.

Replacement Considerations

The TS4436ICT is a compatible variant with ±1% tolerance instead of ±0.5%. Other shunt references with similar low-voltage capabilities may require verification of saturation voltage and current limits.