SLVAFU5 July   2024 LP87521-Q1 , LP87562-Q1 , LP87563-Q1 , TPS62811-Q1 , TPS745-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Introduction
  5. 2 Design Parameters
  6. 3 Power Design
  7. 4 Sequencing
    1. 4.1 Startup
    2. 4.2 Shutdown
  8. 5 Schematic
  9. 6 Compatibility with X9HP
  10. 7 Software Drivers
  11. 8 Recommended External Components
  12. 9 Summary
  13. 10References

1 Introduction

Additional bucks TPS62811-Q1 and TPS628501-Q1 as well as LDOs TPS74501-Q1 and TLV76733-Q1 are used to power other discrete rails not covered by PMICs. This power design assumes an input voltage of 5V (±5%). If the system input voltage is higher, for example a car battery, a buck converter as a pre-regulator needs to be used to generate a supply voltage of 5V. LM25149-Q1 can be used as a pre-regulator when powered directly from car battery. An additional smart diode controller such as LM74700-Q1 can be used to control external MOSFETS and provide power path ON or OFF control and overvoltage protection.

The LP87562-Q1 has four buck converters configured to work as single 3-phase converter and a separate single phase converter. LP87563-Q1 has four buck converters configured to work as single 2-phase converter and two separate single phase converters. LP87563-Q1 has four buck converters configured to work as single 4-phase converter. These devices are OTP programmable, meaning default register values are set in TI production line to desired values and is also possible to control registers through I2C after power-up. Contact TI sales for samples with specific OTP settings.

TPS62811-Q1 is a discrete buck converter with up to 6V input voltage and output voltage ranging from 0.6V to 5.5V. TPS62811-Q1 has maximum output current of 1A and this product family has also other pin-to-pin compatible options ranging from 1A to 6A current capability. 1A buck converter TPS628501-Q1 also has the pin-to-pin compatible devices covering 1A to 3A output current range. This makes it easy to change the part to a different version depending on the use case requirements. This power design is an example how Semidrive X9SP required rails can be powered with TI PMICs. Sequencing is handled through programmable startup/shutdown delays of the PMICs and GPIOs.

This power supply design is also compatible with Semidrive X9HP. Since the power rating of AP rails in X9HP and X9SP are similar, pin-to-pin devices can be used and replaced to lessen design effort in meeting the requirements. Details of the compatibility and options for implementation is discussed later in the document.

This power design is possible to customize and optimize based on the actual use case regarding current requirements, used peripherals, and so forth. I2C control allows diagnostic and control of the PMICs.

For error handling and control this design also has PGOOD output, Interrupt output, and Reset output for the SoC.