SNVSAT3 June 2017 LP873222-Q1

PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1Absolute Maximum Ratings
    2. 6.2ESD Ratings
    3. 6.3Recommended Operating Conditions
    4. 6.4Thermal Information
    5. 6.5Electrical Characteristics
    6. 6.6I2C Serial Bus Timing Parameters
    7. 6.7Typical Characteristics
  7. Detailed Description
    1. 7.1Overview
    2. 7.2Functional Block Diagram
    3. 7.3Feature Description
      1. 7.3.1 DC-DC Converters
        1. 7.3.1.1Overview
        2. 7.3.1.2Transition Between PWM and PFM Modes
        3. 7.3.1.3Buck Converter Load Current Measurement
        4. 7.3.1.4Spread-Spectrum Mode
      2. 7.3.2 Sync Clock Functionality
      3. 7.3.3 Low-Dropout Linear Regulators (LDOs)
      4. 7.3.4 Power-Up
      5. 7.3.5 Regulator Control
        1. 7.3.5.1Enabling and Disabling Regulators
        2. 7.3.5.2Changing Output Voltage
      6. 7.3.6 Enable and Disable Sequences
      7. 7.3.7 Device Reset Scenarios
      8. 7.3.8 Diagnosis and Protection Features
        1. 7.3.8.1Power-Good Information (PGOOD pin)
          1. 7.3.8.1.1PGOOD Pin Gated mode
          2. 7.3.8.1.2PGOOD Pin Continuous Mode
        2. 7.3.8.2Warnings for Diagnosis (Interrupt)
          1. 7.3.8.2.1Output Power Limit
          2. 7.3.8.2.2Thermal Warning
        3. 7.3.8.3Protection (Regulator Disable)
          1. 7.3.8.3.1 Short-Circuit and Overload Protection
          2. 7.3.8.3.2Overvoltage Protection
          3. 7.3.8.3.3Thermal Shutdown
        4. 7.3.8.4Fault (Power Down)
          1. 7.3.8.4.1Undervoltage Lockout
      9. 7.3.9 Operation of the GPO Signals
      10. 7.3.10Digital Signal Filtering
    4. 7.4Device Functional Modes
      1. 7.4.1Modes of Operation
    5. 7.5Programming
      1. 7.5.1I2C-Compatible Interface
        1. 7.5.1.1Data Validity
        2. 7.5.1.2Start and Stop Conditions
        3. 7.5.1.3Transferring Data
        4. 7.5.1.4I2C-Compatible Chip Address
        5. 7.5.1.5Auto-Increment Feature
    6. 7.6Register Maps
      1. 7.6.1Register Descriptions
        1. 7.6.1.1 DEV_REV
        2. 7.6.1.2 OTP_REV
        3. 7.6.1.3 BUCK0_CTRL_1
        4. 7.6.1.4 BUCK0_CTRL_2
        5. 7.6.1.5 BUCK1_CTRL_1
        6. 7.6.1.6 BUCK1_CTRL_2
        7. 7.6.1.7 BUCK0_VOUT
        8. 7.6.1.8 BUCK1_VOUT
        9. 7.6.1.9 LDO0_CTRL
        10. 7.6.1.10LDO1_CTRL
        11. 7.6.1.11LDO0_VOUT
        12. 7.6.1.12LDO1_VOUT
        13. 7.6.1.13BUCK0_DELAY
        14. 7.6.1.14BUCK1_DELAY
        15. 7.6.1.15LDO0_DELAY
        16. 7.6.1.16LDO1_DELAY
        17. 7.6.1.17GPO_DELAY
        18. 7.6.1.18GPO2_DELAY
        19. 7.6.1.19GPO_CTRL
        20. 7.6.1.20CONFIG
        21. 7.6.1.21PLL_CTRL
        22. 7.6.1.22PGOOD_CTRL_1
        23. 7.6.1.23PGOOD_CTRL_2
        24. 7.6.1.24PG_FAULT
        25. 7.6.1.25RESET
        26. 7.6.1.26INT_TOP_1
        27. 7.6.1.27INT_TOP_2
        28. 7.6.1.28INT_BUCK
        29. 7.6.1.29INT_LDO
        30. 7.6.1.30TOP_STAT
        31. 7.6.1.31BUCK_STAT
        32. 7.6.1.32LDO_STAT
        33. 7.6.1.33TOP_MASK_1
        34. 7.6.1.34TOP_MASK_2
        35. 7.6.1.35BUCK_MASK
        36. 7.6.1.36LDO_MASK
        37. 7.6.1.37SEL_I_LOAD
        38. 7.6.1.38I_LOAD_2
        39. 7.6.1.39I_LOAD_1
  8. Application and Implementation
    1. 8.1Application Information
    2. 8.2Typical Application
      1. 8.2.1Design Requirements
        1. 8.2.1.1Inductor Selection
        2. 8.2.1.2Buck Input Capacitor Selection
        3. 8.2.1.3Buck Output Capacitor Selection
        4. 8.2.1.4LDO Input Capacitor Selection
        5. 8.2.1.5LDO Output Capacitor Selection
      2. 8.2.2Detailed Design Procedure
      3. 8.2.3Application Curves
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1Layout Guidelines
    2. 10.2Layout Example
  11. 11Device and Documentation Support
    1. 11.1Device Support
      1. 11.1.1Third-Party Products Disclaimer
    2. 11.2Receiving Notification of Documentation Updates
    3. 11.3Community Resources
    4. 11.4Trademarks
    5. 11.5Electrostatic Discharge Caution
    6. 11.6Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Features

  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to +125°C Ambient Operating Temperature
  • Input Voltage: 2.8 V to 5.5 V
  • Two High-Efficiency Step-Down DC-DC Converters:
    • Output Voltage: 0.7 V to 3.36 V
    • Maximum Output Current 2 A
    • Programmable Output-Voltage Slew Rate from 0.5 mV/µs to 10 mV/µs
    • 2-MHz Switching Frequency
    • Spread-Spectrum Mode and Phase Interleaving for EMI Reduction
  • Two Linear Regulators:
    • Input Voltage: 2.5 V to 5.5 V
    • Output Voltage: 0.8 V to 3.3 V
    • Maximum Output Current 300 mA
  • Configurable General-Purpose Output Signals (GPO, GPO2)
  • Interrupt Function with Programmable Masking
  • Programmable Power-Good Signal (PGOOD)
  • Output Short-Circuit and Overload Protection
  • Overtemperature Warning and Protection
  • Overvoltage Protection (OVP) and Undervoltage Lockout (UVLO)
  • 28-pin, 5-mm × 5-mm VQFN Package with Wettable Flanks
  • Simplified Schematic

    LP873222-Q1 Schem_01_SNVSAB5.gif

Applications

  • Automotive Head Unit and Cluster
  • Surround View System ECU
  • Radar System ECU
  • Automotive Camera Module
  • Automotive Display

Description

The LP873222-Q1 is designed to meet the power management requirements in automotive applications. The device contains two step-down DC-DC converters and two linear regulators and general-purpose digital-output signals. The device is controlled by an I2C-compatible serial interface and by an enable signal.

The automatic PWM/PFM (AUTO mode) operation gives high efficiency over a wide output-current range. The LP873222-Q1 supports remote voltage sensing to compensate IR drop between the regulator output and the point-of-load (POL) thus improving the accuracy of the output voltage. In addition the switching clock can be forced to PWM mode and also synchronized to an external clock to minimize the disturbances.

The LP873222-Q1 device supports programmable start-up and shutdown delays and sequences including GPO signals synchronized to the enable signal. During start-up and voltage change, the device controls the output slew rate to minimize output voltage overshoot and the in-rush current.

Device Information

PART NUMBERPACKAGEBODY SIZE (NOM)
LP873222-Q1VQFN (28)5.00 mm × 5.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

DC-DC Efficiency vs Output Current

LP873222-Q1 D002_SNVSAB5.gif

Revision History

DATEREVISIONNOTES
June 2017*Initial release