1 Introduction

This application note details the design considerations of a power design for the Semidrive G9H SoC (system-on-chip) power rails using the LP87565V-Q1 and LP875230C-Q1 power management ICs (PMICs). An additional TPS74501-Q1 LDO and TPS6281120-Q1 buck converter are used for the peripheral rails. Safety rails are powered by the LP873248-Q1 PMIC. 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 with high enough current capability can be used to generate a supply voltage of 5V.

The LP87565V-Q1 has four buck converters configured to work as dual 2-phase converters. LP875230C-Q1 is configured to work as 2-phase converter for the GPU rail and then additional two single phase rails for the peripherals. LP873248-Q1 is used for the safety power rails. These devices are OTP programmable, meaning default register values are set in TI production line to desired values for this platform without further need for customers to change settings through I²C bus. Full orderable part numbers for these OTP spins are LP87565VRNFRQ1, LP875230CRNFRQ1, and LP873248RHDRQ1. See the Technical Reference Manuals for the specific part numbers for more details on the OTP settings.

This power design is an example of how the Semidrive G9H required rails can be powered with TI PMICs. Sequencing is handled through programmable startup/shutdown delays of the PMICs and GPIOs and only requires a single Enable signal from the system to initiate the sequencing. This power design is possible to customize and optimize based on the actual use case regarding current requirements, used peripherals, and so forth.