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The AM64x and AM243x Sitara processor lines provide highly flexible, real-time, and low latency processing for a broad range of industrial applications. These processors come in an array of variants with up to two Arm® Cortex® -A53 cores and up to four Arm® Cortex® -R5F cores each. TI has multiple power management IC (PMIC) options to meet the complex power needs of each processor variant.
This application note reviews two variants of the LP8733xx and two variants of the TPS65218xx PMICs that power these Sitara processor lines. A selection guide outlines both a single-PMIC and dual-PMIC solution for the AM64x, and a single-PMIC solution for the AM243x. The application note also highlights the value each PMIC solution brings to the overall system and provides example power maps for each variant.
The LP8733xx and TPS65218xx are optimized and highly integrated power management solutions for the AM64x and AM243x processors. Table 2-1 provides an overview of the technical features for each PMIC family.
Features | LP8733xx | TPS65218xx |
---|---|---|
Input range | 2.8 V to 5.5 V | 2.7 V to
5.5 V (Converters) 1.8 V to 5.5 V (LDO) |
Number of regulators | 4 | 7 |
Number of DC-DC step-down converters | 2 | 3
(Adjustable output voltage) 2 (Backup battery domain) |
Number of Buck-boost converters | 0 | 1 |
Number of LDOs | 2 | 1 |
Additional Features |
|
|
Ability to reprogram using EEPROM | No | Yes |
The LP8733xx is a one-time programmable (OTP) device that comes pre-programmed to simplify the design process and allows direct implementation of the given power configuration with no modifications needed.
The TPS65218xx is a non-volatile memory (NVM) device that comes both pre-programmed and user-programmable. For example, the TPS6521855 is pre-programmed to meet the AM64x power sequence and configuration needs when paired with the LP873364. The TPS6521815 is a user programmable DIY device that comes with a blank EEPROM and disabled regulators to provide freedom to customize the desired output voltages, sequencing and more from start up as further explained in Section 6. All devices in the TPS65218xx family have a reprogrammable EEPROM, allowing flexibility to change configuration settings according to system needs.