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

6 Compatibility with X9HP

This power supply design can be compatible with Semidrive X9HP, where pin-to-pin devices can be used to lessen re-design effort.

RTC and safety power supply for both MCUs are the same, so same power tree can be reused in powering X9HP.

There are some differences in powering the AP rails for X9HP and X9SP. Table 6-1 summarizes the differences in power requirement of X9HP and X9HP.

Table 6-1 Power Requirement Differences of X9HP and X9SP
Rail NamesPower Requirement in X9HPPower Requirement in X9SP
VDD_AP + VDD_PHY(VDD_MIPI, VDD_PCIE, VDD_USB, VDDD_USB)0.8V, 8A(combined with VDD_AP and VDD_PHY)0.85V, 10A+0.45A
VDD_DRAM0.8V, 8A(combined with VDD_AP and VDD_PHY)0.85V, 2A
VDD_GPU0.85V, 5A0.85V, 8A
VDDQ_DRAM1.1V, 1.75A1.1V, 0.75A
VDDA, VDDA_MIPI1.8V, 1A+50mA1.8V, 1A+300mA
VDD_CPU0.8V, 6A0.85V, 10A
VDDH3.3V, 450mA

3.3V, 450mA

Combined with VDDIO_3V3, 3.3V, 300mA

Figure 6-1 shows AP power tree with LP87565V-Q1, LP875230C-Q1, TLV76733-Q1, TPS6281120-Q1, and TPS74518-Q1 devices powering the X9HP rails. Note that the PMICs for VDD_AP, VDD_DRAM and VDD_CPU are not pin-to-pin replaceable (two PMICs (LP87562-Q1 and LP87521-Q1) are used for these three rails in powering X9SP, while only one PMIC (LP87565V-Q1) is used for X9HP).

Semidrive X9HP AP Power Design Block DiagramFigure 6-1 Semidrive X9HP AP Power Design Block Diagram

Since other rails are still pin-to-pin interchangeable, Table 6-2 shows the pin-to-pin options for rail VDD_GPU, VDDQ_DRAM, VDDA_1V8, VDDA_MIPI, VDDH_3V3 (and VDDIO_3V3), VDDQLP_DRAM and VDD_LP4.

Table 6-2 Pin-to-Pin Options
Rail NamesAllocated Device for X9HPAllocated Device for X9SP
VDD_GPU, VDDQ_DRAM, VDDA_1V8, VDDA_MIPI_1V8LP875230C-Q1LP87563-Q1
VDDH_3V3 (and VDDIO_3V3)TLV76733-Q1TLV76733-Q1
VDDQLP_DRAMTPS628501-Q1TPS628501-Q1
VDD_LP4_1V8TPS74518-Q1TPS74501-Q1 (substitution is optional)

There are three options when re-selecting the devices for achieving the compatibility between X9HP and X9SP.

  1. Substituting PMICs: As discussed previously, use LP87562TRNFRQ1 and LP87521SRNFRQ1 for X9SP to substitute LP87565VRNFRQ1 for X9HP in powering VDD_AP, VDD_DRAM and VDD_CPU.
  2. Substitute PMICs with discrete bucks: End users can power VDD_AP, VDD_DRAM and VDD_CPU with discrete pin-to-pin bucks for simple upgrade compatibility. See Table 6-3 for an example substitution.
    Table 6-3 Examples of Substitution
    Rail Names Allocated Device for X9HP Allocated Device for X9SP
    VDD_AP TPS62870-Q1 (rated at 6A; 6A needed) TPS62872-Q1 (rated at 12A; 10.45A needed)

    VDD_DRAM

    		 TPS62811-Q1 (rated at 1A; 1A needed) TPS62812-Q1 (rated at 2A; 2A needed)

    VDD_CPU

    		 TPS62870-Q1 (rated at 6A; 6A needed) TPS62872-Q1 (rated at 12A; 10A needed)
  3. Substitute all rails with discrete bucks/LDOs: End users can further replace the LP8752/63-Q1 PMIC (originally for VDD_GPU, VDDQ_DRAM, VDDA_1V8 and VDDA_MIPI_1V8) with discrete pin-to-pin bucks, as an extension of previous discussions. See Table 6-4 for an example substitution.
    Table 6-4 Examples of Substitution
    Rail Names Allocated Device for X9HP Allocated Device for X9SP
    VDD_GPU TPS62870-Q1 (rated at 6A; 5A needed) TPS62871-Q1 (rated at 9A; 8A needed)
    VDDQ_DRAM TPS62812-Q1 (rated at 2A; 1.75A needed) TPS62811-Q1 (rated at 1A; 0.75A needed)
    VDDA_1V8

    VDDA_MIPI_1V8

    		 TPS62812-Q1 (rated at 2A; 1.05A needed) TPS62812-Q1 (rated at 2A; 1.3A needed)