SLVSGZ4A June   2023  – June 2024 TPS6521905

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1  Absolute Maximum Ratings
    2. 5.2  ESD Ratings
    3. 5.3  Recommended Operating Conditions
    4. 5.4  Thermal Information
    5. 5.5  System Control Thresholds
    6. 5.6  BUCK1 Converter
    7. 5.7  BUCK2, BUCK3 Converter
    8. 5.8  General Purpose LDOs (LDO1, LDO2)
    9. 5.9  General Purpose LDOs (LDO3, LDO4)
    10. 5.10 GPIOs and multi-function pins (EN/PB/VSENSE, nRSTOUT, nINT, GPO1, GPO2, GPIO, MODE/RESET, MODE/STBY, VSEL_SD/VSEL_DDR)
    11. 5.11 Voltage and Temperature Monitors
    12. 5.12 I2C Interface
    13. 5.13 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1  Power-Up Sequencing
      2. 6.3.2  Power-Down Sequencing
      3. 6.3.3  Push Button and Enable Input (EN/PB/VSENSE)
      4. 6.3.4  Reset to SoC (nRSTOUT)
      5. 6.3.5  Buck Converters (Buck1, Buck2, and Buck3)
      6. 6.3.6  Linear Regulators (LDO1 through LDO4)
      7. 6.3.7  Interrupt Pin (nINT)
      8. 6.3.8  PWM/PFM and Low Power Modes (MODE/STBY)
      9. 6.3.9  PWM/PFM and Reset (MODE/RESET)
      10. 6.3.10 Voltage Select pin (VSEL_SD/VSEL_DDR)
      11. 6.3.11 General Purpose Inputs or Outputs (GPO1, GPO2, and GPIO)
      12. 6.3.12 I2C-Compatible Interface
        1. 6.3.12.1 Data Validity
        2. 6.3.12.2 Start and Stop Conditions
        3. 6.3.12.3 Transferring Data
    4. 6.4 Device Functional Modes
      1. 6.4.1 Modes of Operation
        1. 6.4.1.1 OFF State
        2. 6.4.1.2 INITIALIZE State
        3. 6.4.1.3 ACTIVE State
        4. 6.4.1.4 STBY State
        5. 6.4.1.5 Fault Handling
    5. 6.5 Multi-PMIC Operation
    6. 6.6 NVM Programming
      1. 6.6.1 TPS6521905 default NVM settings
      2. 6.6.2 NVM programming in Initialize State
      3. 6.6.3 NVM Programming in Active State
    7. 6.7 User Registers
    8. 6.8 Device Registers
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Typical Application Example
      2. 7.2.2 Design Requirements
      3. 7.2.3 Detailed Design Procedure
        1. 7.2.3.1 Buck1, Buck2, Buck3 Design Procedure
        2. 7.2.3.2 LDO1, LDO2 Design Procedure
        3. 7.2.3.3 LDO3, LDO4 Design Procedure
        4. 7.2.3.4 VSYS, VDD1P8
        5. 7.2.3.5 Digital Signals Design Procedure
      4. 7.2.4 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Receiving Notification of Documentation Updates
    2. 8.2 Support Resources
    3. 8.3 Trademarks
    4. 8.4 Electrostatic Discharge Caution
    5. 8.5 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

6.1 Overview

The TPS6521905 provides three step-down converters, four LDOs, three general-purpose I/Os and three multi-Function pins. The system can be supplied by a single cell Li-Ion battery, two primary cells or a regulated supply. The device is characterized across a -40°C to +105°C temperature range, which makes the PMIC an excellent choice for various industrial applications.

The I2C interface provides comprehensive features for using TPS6521905. All rails, the GPOs and the GPIO can be enabled or disabled. Voltage thresholds for the undervoltage monitoring can be customized.

The integrated voltage supervisor monitors Buck 1–3 and LDO1–4 for undervoltage. The monitor has two sensitivity settings. A power good signal is provided to report the successful ramp of the power rails and GPIOs. The nRSTOUT pin is pulled low until the device enters ACTIVE state. When powering down from ACTIVE- or STBY-state, nRSTOUT is pulled low again. The nRSTOUT pin has an open-drain output. A fault-pin, nINT, notifies the SoC about faults.

Buck1 step-down converter can supply up to 3.5 A of current, Buck2 and Buck3 can supply up to 2 A each. The default output voltages for each converter can be adjusted through the I2C interface. All three buck-converters feature dynamic voltage scaling. The step-down converters operate in a low power mode at light load or can be forced into PWM operation for noise sensitive applications.

LDO1 and LDO2 support output currents of 400 mA at an output voltage range of 0.6 V to 3.4 V. These LDOs support bypass mode, acting as a load-switch, and allow voltage-changes during operation for applications like SD-card-supply, adjusting the IO-supply of the SD-card from 3.3 V to 1.8 V after initialization.

LDO3 and LDO4 support output currents of 300 mA at an output voltage range of 1.2 V to 3.3 V. These LDOs support load-switch-mode, but not bypass mode.

The I2C-interface, IOs, GPIOs, and multi-function-pins (MFP) allow a seamless interface to a wide range of SoCs.

All configurations of the rails, for example output-voltages, sequencing, are backed up by EEPROM. Please refer to the Technical Reference Manual (TRM) of the chosen configuration.