AM62 requires controlled power-up and power-down sequences to properly operate subsystems and downstream components. Power sequencing is critical in voltage rails that must turn on in specific orders to make sure of operational safely and reliability. Sequencing the rails also helps stagger the inrush current during power-up, which reduces system stress and prevents unexpected reverse bias conditions.

TPS65219 PMIC simplifies the BOM with built-in voltage supervisors and a digital sequencer integrated within the PMIC. Meanwhile the discrete SK-AM62B design requires 6 additional components to enable a daisy-chain sequence, which does not have the same level of control and precision as the TPS65219’s sequencer capabilities. The TPS65219 sequencer has a built-in memory that allows digitally controlled sequencing and information that can be read back to the processor through I2C. The advantages of the TPS65219 digital power sequencer in comparison to a discrete implementation is:

• Reduced external component count and smaller footprint.
• Greater precision and customization of the sequence. TPS6521905 has 16 slots that can be configured as 0ms, 1.5ms, 3ms or 10ms durations.
• Flexibility to include sequencing across several TPS65219-devices and additional peripherals or discrete devices in the system. Power up and down sequence can also be reprogrammed through I2C.

The TPS65219 also provides undervoltage and overcurrent protection, Short-to-GND-detection, Residual-Voltage detection, WARM-warning, and Thermal Shutdown.