SNVSB23 March   2018 LP87521-Q1 , LP87522-Q1 , LP87523-Q1 , LP87524-Q1 , LP87525-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
    1.     Simplified Schematic
  3. 3 Description
    1.     Efficiency vs Output Current
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 I2C Serial Bus Timing Requirements
    7. 7.7 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Descriptions
      1. 8.3.1 Multi-Phase DC/DC Converters
        1. 8.3.1.1 Overview
        2. 8.3.1.2 Multiphase Operation, Phase Adding, and Phase-Shedding
        3. 8.3.1.3 Transition Between PWM and PFM Modes
        4. 8.3.1.4 Multiphase Switcher Configurations
        5. 8.3.1.5 Buck Converter Load-Current Measurement
        6. 8.3.1.6 Spread-Spectrum Mode
      2. 8.3.2 Sync Clock Functionality
      3. 8.3.3 Power-Up
      4. 8.3.4 Regulator Control
        1. 8.3.4.1 Enabling and Disabling Regulators
        2. 8.3.4.2 Changing Output Voltage
      5. 8.3.5 Enable and Disable Sequences
      6. 8.3.6 Device Reset Scenarios
      7. 8.3.7 Diagnosis and Protection Features
        1. 8.3.7.1 Power-Good Information (PGOOD Pin)
        2. 8.3.7.2 Warnings for Diagnosis (Interrupt)
          1. 8.3.7.2.1 Output Power Limit
          2. 8.3.7.2.2 Thermal Warning
        3. 8.3.7.3 Protection (Regulator Disable)
          1. 8.3.7.3.1 Short-Circuit and Overload Protection
          2. 8.3.7.3.2 Overvoltage Protection
          3. 8.3.7.3.3 Thermal Shutdown
        4. 8.3.7.4 Fault (Power Down)
          1. 8.3.7.4.1 Undervoltage Lockout
      8. 8.3.8 GPIO Signal Operation
      9. 8.3.9 Digital Signal Filtering
    4. 8.4 Device Functional Modes
      1. 8.4.1 Modes of Operation
    5. 8.5 Programming
      1. 8.5.1 I2C-Compatible Interface
        1. 8.5.1.1 Data Validity
        2. 8.5.1.2 Start and Stop Conditions
        3. 8.5.1.3 Transferring Data
        4. 8.5.1.4 I2C-Compatible Chip Address
        5. 8.5.1.5 Auto-Increment Feature
    6. 8.6 Register Maps
      1. 8.6.1 Register Descriptions
        1. 8.6.1.1  OTP_REV
        2. 8.6.1.2  BUCK0_CTRL1
        3. 8.6.1.3  BUCK1_CTRL1
        4. 8.6.1.4  BUCK2_CTRL1
        5. 8.6.1.5  BUCK3_CTRL1
        6. 8.6.1.6  BUCK0_VOUT
        7. 8.6.1.7  BUCK0_FLOOR_VOUT
        8. 8.6.1.8  BUCK1_VOUT
        9. 8.6.1.9  BUCK1_FLOOR_VOUT
        10. 8.6.1.10 BUCK2_VOUT
        11. 8.6.1.11 BUCK2_FLOOR_VOUT
        12. 8.6.1.12 BUCK3_VOUT
        13. 8.6.1.13 BUCK3_FLOOR_VOUT
        14. 8.6.1.14 BUCK0_DELAY
        15. 8.6.1.15 BUCK1_DELAY
        16. 8.6.1.16 BUCK2_DELAY
        17. 8.6.1.17 BUCK3_DELAY
        18. 8.6.1.18 GPIO2_DELAY
        19. 8.6.1.19 GPIO3_DELAY
        20. 8.6.1.20 RESET
        21. 8.6.1.21 CONFIG
        22. 8.6.1.22 INT_TOP1
        23. 8.6.1.23 INT_TOP2
        24. 8.6.1.24 INT_BUCK_0_1
        25. 8.6.1.25 INT_BUCK_2_3
        26. 8.6.1.26 TOP_STAT
        27. 8.6.1.27 BUCK_0_1_STAT
        28. 8.6.1.28 BUCK_2_3_STAT
        29. 8.6.1.29 TOP_MASK1
        30. 8.6.1.30 TOP_MASK2
        31. 8.6.1.31 BUCK_0_1_MASK
        32. 8.6.1.32 BUCK_2_3_MASK
        33. 8.6.1.33 SEL_I_LOAD
        34. 8.6.1.34 I_LOAD_2
        35. 8.6.1.35 I_LOAD_1
        36. 8.6.1.36 PGOOD_CTRL1
        37. 8.6.1.37 PGOOD_CTRL2
        38. 8.6.1.38 PGOOD_FLT
        39. 8.6.1.39 PLL_CTRL
        40. 8.6.1.40 PIN_FUNCTION
        41. 8.6.1.41 GPIO_CONFIG
        42. 8.6.1.42 GPIO_IN
        43. 8.6.1.43 GPIO_OUT
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Design Requirements
        1. 9.2.1.1 Inductor Selection
        2. 9.2.1.2 Input Capacitor Selection
        3. 9.2.1.3 Output Capacitor Selection
        4. 9.2.1.4 Snubber Components
        5. 9.2.1.5 Supply Filtering Components
        6. 9.2.1.6 Current Limit vs. Maximum Output Current
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Related Links
    4. 12.4 Receiving Notification of Documentation Updates
    5. 12.5 Community Resources
    6. 12.6 Trademarks
    7. 12.7 Electrostatic Discharge Caution
    8. 12.8 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

封装选项

请参考 PDF 数据表获取器件具体的封装图。

机械数据 (封装 | 引脚)
  • RNF|26
散热焊盘机械数据 (封装 | 引脚)
订购信息

8.3.7 Diagnosis and Protection Features

The LP8752x-Q1 is capable of providing four levels of protection features:

  • Information of valid regulator output voltage, which sets interrupt or PGOOD signal;
  • Warnings for diagnosis, which set interrupt;
  • Protection events that are disabling the regulators affected; and
  • Faults that are causing the device to shut down.

The LP8752x-Q1 sets the flag bits indicating what protection or warning conditions have occurred, and the nINT pin is pulled low. nINT is released again after a clear of flags is complete. The nINT signal stays low until all the pending interrupts are cleared.

When a fault is detected, it is indicated by a RESET_REG interrupt flag (in INT2_TOP register) after next start-up.

Table 5. Summary of Interrupt Signals

EVENT RESULT INTERRUPT REGISTER AND BIT INTERRUPT MASK STATUS BIT RECOVERY/INTERRUPT CLEAR
Current limit triggered (20-µs debounce) Interrupt INT_BUCKx = 1
BUCKx_ILIM_INT = 1		 BUCKx_ILIM_MASK BUCKx_ILIM_STAT Write 1 to BUCKx_ILIM_INT bit
Interrupt is not cleared if current limit is active.
Short circuit (VVOUT < 0.35 V at 1 ms after enable) or overload (VVOUT decreasing below 0.35 V during operation, 1 ms debounce) Regulator disable and interrupt INT_BUCKx = 1
BUCKx_SC_INT = 1		 N/A N/A Write 1 to BUCKx_SC_INT bit
Thermal warning Interrupt TDIE_WARN = 1 TDIE_WARN_MASK TDIE_WARN_STAT Write 1 to TDIE_WARN bit
Interrupt is not cleared if temperature is above thermal warning level.
Thermal whutdown All regulators disabled and Output GPIOx set to low and interrupt. TDIE_SD = 1 N/A TDIE_SD_STAT Write 1 to TDIE_SD bit
Interrupt is not cleared if temperature is above thermal shutdown level.
VANA overvoltage (VANAOVP) All regulators disabled and Output GPIOx set to low and interrupt. INT_OVP N/A OVP_STAT Write 1 to INT_OVP bit
Interrupt is not cleared if VANA voltage is above VANA OVP level.
Power Good, output voltage reaches the programmed value Interrupt INT_BUCKx = 1
BUCKx_PG_INT = 1		 BUCKx_PG_MASK BUCKx_PG_STAT Write 1 to BUCKx_PG_INT bit
GPIO Interrupt INT_GPIO GPIO_MASK GPIO_IN register Write 1 to INT_GPIO bit
External clock appears or disappears Interrupt NO_SYNC_CLK(1) SYNC_CLK_MASK SYNC_CLK_STAT Write 1 to NO_SYNC_CLK bit
Load current measurement ready Interrupt I_LOAD_READY = 1 I_LOAD_READY_MASK N/A Write 1 to I_LOAD_READY bit
Start-up (NRST rising edge) Device ready for operation; registers reset to default values and interrupt. RESET_REG = 1 RESET_REG_MASK N/A Write 1 to RESET_REG bit
Glitch on supply voltage and UVLO triggered (VANA falling and rising) Immediate shutdown followed by power up; registers reset to default values and interrupt. RESET_REG = 1 RESET_REG_MASK N/A Write 1 to RESET_REG bit
Software requested reset Immediate shutdown followed by power up; registers reset to default values and interrupt. RESET_REG = 1 RESET_REG_MASK N/A Write 1 to RESET_REG bit
(1) Interrupt is generated during clock detector operation, and in cases where clock is not available when clock detector is enabled.
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