SLVUBY7A October   2020  – October 2022 DRA821U , DRA821U-Q1 , LP8764-Q1 , TPS6594-Q1

 

  1.   User's Guide for Powering DRA821 with TPS6594-Q1 and LP8764-Q1
  2.   Trademarks
  3. 1Introduction
  4. 2Device Versions
  5. 3Processor Connections
  6. 4Supporting Functional Safety Systems
    1. 4.1 Achieving ASIL-B System Requirements
    2. 4.2 Achieving up to ASIL-D System Requirements
  7. 5Static NVM Settings
    1. 5.1  Application-Based Configuration Settings
    2. 5.2  Device Identification Settings
    3. 5.3  BUCK Settings
    4. 5.4  LDO Settings
    5. 5.5  VCCA Settings
    6. 5.6  GPIO Settings
    7. 5.7  Finite State Machine (FSM) Settings
    8. 5.8  Interrupt Settings
    9. 5.9  POWERGOOD Settings
    10. 5.10 Miscellaneous Settings
    11. 5.11 Interface Settings
    12. 5.12 Multi-Device Settings
    13. 5.13 Watchdog Settings
  8. 6Pre-Configurable Finite State Machine (PFSM) Settings
    1. 6.1 Configured States
    2. 6.2 PFSM Triggers
    3. 6.3 Power Sequences
      1. 6.3.1 TO_SAFE_SEVERE
      2. 6.3.2 TO_SAFE_ORDERLY and TO_STANDBY
      3. 6.3.3 ACTIVE_TO_WARM
      4. 6.3.4 ESM_SOC_ERROR
      5. 6.3.5 PWR_SOC_ERROR
      6. 6.3.6 MCU_TO_WARM
      7. 6.3.7 TO_MCU
      8. 6.3.8 TO_ACTIVE
      9. 6.3.9 TO_RETENTION
  9. 7Application Examples
    1. 7.1 Moving Between States: ACTIVE, MCU, and RETENTION
      1. 7.1.1 ACTIVE
      2. 7.1.2 MCU ONLY
      3. 7.1.3 RETENTION
    2. 7.2 Entering and Exiting Standby
    3. 7.3 Entering and Existing LP_STANDBY
    4. 7.4 GPIO8 and Watchdog
  10. 8Additional Resources
  11. 9Revision History

5.1 Application-Based Configuration Settings

In the LP876441B1-Q1 and TPS6594141B-Q1 data sheet, there are multiple application-based configurations for each BUCK to operate within. Table 5-1 includes the different configurations available:

Table 5-1 LP876441B1-Q1 and TPS6594141B-Q1 Use Cases
TPS6594141B-Q1 LP876441B1-Q1
2.2 MHz Single Phase for DDR Termination 2.2MHz Single-Phase for DDR Termination
4.4 MHz VOUT Less than 1.9 V, Multiphase 4.4MHz Single-Phase and Multi-Phase
4.4 MHz VOUT Less than 1.9 V, Single Phase 4.4MHz Single-Phase, Low Output Voltage
4.4 MHz VOUT Greater than 1.7 V, Single Phase 4.4MHz Single-Phase, High Output Voltage
2.2 MHz VOUT Less than 1.9 V, Multiphase or Single Phase 2.2MHz Single-Phase Configuration with 5.0V VIN
2.2 MHz Full VOUT Range with 5.0 V VIN, Single Phase 2.2MHz Single-Phase and Multi-Phase Configuration
2.2 MHz Full VOUT and Full VIN Range, Single Phase 2.2MHz Single-Phase Generic Configuration

The seven configurations also have optimal output inductance values that optimize the performance of each buck under these various conditions. Table 5-2 shows the default configurations for the BUCKs. These settings cannot be changed after device startup.

Table 5-2 Application Use Case Settings
Device BUCK Rail Default Application Use Case Recommended Inductor Value
TPS6594141B-Q1 BUCK1 4.4 MHz VOUT Less than 1.9 V, Single Phase 220 nH
BUCK2 4.4 MHz VOUT Less than 1.9 V, Single Phase 220 nH
BUCK3 4.4 MHz VOUT Less than 1.9 V, Single Phase 220 nH
BUCK4 4.4 MHz VOUT Less than 1.9 V, Single Phase 220 nH
BUCK5 4.4 MHz VOUT Less than 1.9 V, Single Phase 220 nH
LP876441B1-Q1 BUCK1 4.4MHz Single-Phase, Low Output Voltage 220 nH
BUCK2 4.4MHz Single-Phase, Low Output Voltage 220 nH
BUCK3 4.4MHz Single-Phase, Low Output Voltage 220 nH
BUCK4 4.4MHz Single-Phase, Low Output Voltage 220 nH