SPSA068-TR

Overview

The SPSA068-TR is a power management IC designed for microcontroller applications, integrating a buck regulator and a precision voltage reference. It features an internal power switch and programmable non-volatile memory for configuring parameters such as output voltage and switching frequency. The device supports AEC-Q100 qualification and includes an SPI interface with CRC for diagnostics and monitoring. Key electrical characteristics include a pre-buck SMPS regulator adjustable to 5.0 V, 3.3 V, or 1.2 V with load currents of 0.5 A or 1.0 A at switching frequencies of 0.4 MHz or 2.4 MHz. The precision voltage reference offers 1% accuracy, supporting 20 mA load current. Standby mode quiescent current is less than 5 μA, while low-power active mode static current is typically 50 μA.

Feature Summary

• Integrates a programmable buck regulator and high-precision voltage reference within a single package.
• Features internal non-volatile memory allowing configuration of primary device parameters without external microcontrollers.
• Includes an SPI interface with CRC checksums for secure programming, monitoring, and diagnostic functions.
• Supports automotive functional safety requirements with built-in voltage supervisors and window watchdog monitors.

Applications

• Automotive microcontroller unit (MCU) power supplies
• Telematics and connectivity control units
• Driver monitoring systems (DMS)
• Rear-view camera systems

Procurement Notes

Verify the specific suffix against official STMicroelectronics documentation to confirm tape-and-reel packaging specifications and quantity per reel. Ensure the component meets the required automotive qualification standards for your target application environment. Cross-reference the ordering code with the latest datasheet to confirm pinout compatibility and thermal performance ratings before finalizing procurement.

Selection Notes

Select this component when designing power architectures for automotive MCUs requiring integrated regulation and reference capabilities. Consider the programmable switching frequencies and output voltages to optimize efficiency for specific load profiles. Evaluate the low standby current consumption if battery-backed retention or ultra-low power states are critical design constraints.

Part Context

The SPSA068 belongs to STMicroelectronics' portfolio of power management integrated circuits tailored for automotive environments. It addresses the need for compact, highly integrated solutions that reduce external component counts while maintaining high reliability. The device complements other automotive-grade PMICs by offering specialized features like programmable NVM and robust diagnostic interfaces suitable for safety-critical systems.

Replacement Considerations

Consult official STMicroelectronics substitution guides for verified alternative part numbers. Do not assume cross-compatibility with generic buck regulators due to the unique NVM programming and SPI diagnostic architecture. Verify that any substitute maintains equivalent AEC-Q100 qualification and functional safety integrity levels.

FAQ

How is the output voltage configured on the SPSA068?

The output voltage can be set via internal non-volatile memory to standard values like 5.0 V, 3.3 V, or 1.2 V, or adjusted using an external resistor divider within the 1.2 V to 5.0 V range.

What diagnostic capabilities does the SPSA068 provide?

It features an SPI interface with CRC support for reading status, configuring parameters, and accessing fault detection pins. It also includes a programmable window watchdog and thermal warning/shutdown functions.