Introduction to the PMU TPS65219 for AM6254

The TPS65219 is a highly integrated Power Management Unit (PMU) designed by Texas Instruments (TI) specifically for embedded processors, such as the AM62x series (e.g., AM6254). It meets the complex power requirements of these processors and provides multiple power rails, power sequencing capabilities, and integrated protection features. This makes it an ideal choice for industrial and embedded applications. This article introduces the key features, functionalities, and design considerations for the TPS65219.

1. Overview of TPS65219

The TPS65219 is optimized for TI’s Sitara AM62x series processors and provides a complete power management solution to simplify system design. It integrates multiple power rails, including buck converters and low dropout regulators (LDOs), along with advanced control features.

Key Features:

●3 DC-DC Buck Converters (DCDC1~DCDC3): Provide efficient power for the core, DDR memory, and peripherals.

●4 Low Dropout Regulators (LDO1~LDO4): Deliver stable power for analog circuits and low-current modules.

●Programmable Power Sequencing: Ensures the power-up sequence meets the design requirements of AM62x processors.

●Comprehensive Protection Features: Includes overvoltage, undervoltage, overcurrent, and overtemperature protections to enhance system safety.

2. Internal Architecture of TPS65219

The TPS65219 PMU provides multiple power rails to meet the power demands of the AM62x processor and its peripherals.

Figure 1 TPS65910 internal block diagram

2.1 DCDC1~DCDC3

Supply efficient power for the core, DDR memory, and high-performance peripherals.

The output voltage range is adjustable, typically from 0.8V to 3.3V.

High conversion efficiency makes it suitable for high-power applications.

2.2 LDO1~LDO4

Provide stable, low-noise power for analog modules (e.g., audio circuits) and other low-power devices.Designed to support moderate output current, suitable for driving low-power components.

3. Differences Among TPS65219 Variants

The TPS65219 family includes different variants tailored for specific system requirements:

Figure 2 The difference between TPS65910 models

●TPS6521901: Designed for 5V input systems, while other models are tailored for 3.3V input systems.

●TPS6521902: Specifically designed for LPDDR4 memory systems, whereas the other variants target DDR4 applications.

●TPS6521903 vs. TPS6521904: The key difference lies in the VDD_CORE voltage; 0.85V enables the processor to reach a maximum frequency of 1.4GHz.

4. Protection Features of TPS65219

The TPS65219 integrates various protection mechanisms to enhance system stability and safety:

●Overvoltage Protection (OVP): Automatically shuts down power if the output voltage exceeds the set limit, preventing damage to components.

●Undervoltage Protection (UVP): Triggers an alert when the output voltage drops below the set threshold, avoiding abnormal system behavior.

●Overcurrent Protection (OCP): Prevents overload by shutting down power when excessive current is detected.

●Overtemperature Protection (OTP): Automatically disables power output if the chip temperature exceeds the safe range.

5. Conclusion

The TPS65219 is a PMU specifically designed for TI’s AM62x processors. It offers flexible power outputs, precise power sequencing, and comprehensive protection features. With proper design and optimization, the TPS65219 provides a reliable and efficient power solution for embedded and industrial systems.

During the design process, engineers should pay special attention to power rail allocation, sequencing management, and PCB layout to maximize the performance of both the AM62x processor and the TPS65219.

As a third-party partner of TI, Weathink offers support for circuit design and recommends its AM62x SOM for use in applications requiring the TPS65219.

WTC-AM62XXS SOM: https://www.weathink.com/products/hexinban/11.html