SNVSB22 March   2018 LP87561-Q1 , LP87562-Q1 , LP87563-Q1 , LP87564-Q1 , LP87565-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  BUCK0_CTRL2
        4. 8.6.1.4  BUCK1_CTRL1
        5. 8.6.1.5  BUCK1_CTRL2
        6. 8.6.1.6  BUCK2_CTRL1
        7. 8.6.1.7  BUCK2_CTRL2
        8. 8.6.1.8  BUCK3_CTRL1
        9. 8.6.1.9  BUCK3_CTRL2
        10. 8.6.1.10 BUCK0_VOUT
        11. 8.6.1.11 BUCK0_FLOOR_VOUT
        12. 8.6.1.12 BUCK1_VOUT
        13. 8.6.1.13 BUCK1_FLOOR_VOUT
        14. 8.6.1.14 BUCK2_VOUT
        15. 8.6.1.15 BUCK2_FLOOR_VOUT
        16. 8.6.1.16 BUCK3_VOUT
        17. 8.6.1.17 BUCK3_FLOOR_VOUT
        18. 8.6.1.18 BUCK0_DELAY
        19. 8.6.1.19 BUCK1_DELAY
        20. 8.6.1.20 BUCK2_DELAY
        21. 8.6.1.21 BUCK3_DELAY
        22. 8.6.1.22 GPIO2_DELAY
        23. 8.6.1.23 GPIO3_DELAY
        24. 8.6.1.24 RESET
        25. 8.6.1.25 CONFIG
        26. 8.6.1.26 INT_TOP1
        27. 8.6.1.27 INT_TOP2
        28. 8.6.1.28 INT_BUCK_0_1
        29. 8.6.1.29 INT_BUCK_2_3
        30. 8.6.1.30 TOP_STAT
        31. 8.6.1.31 BUCK_0_1_STAT
        32. 8.6.1.32 BUCK_2_3_STAT
        33. 8.6.1.33 TOP_MASK1
        34. 8.6.1.34 TOP_MASK2
        35. 8.6.1.35 BUCK_0_1_MASK
        36. 8.6.1.36 BUCK_2_3_MASK
        37. 8.6.1.37 SEL_I_LOAD
        38. 8.6.1.38 I_LOAD_2
        39. 8.6.1.39 I_LOAD_1
        40. 8.6.1.40 PGOOD_CTRL1
        41. 8.6.1.41 PGOOD_CTRL2
        42. 8.6.1.42 PGOOD_FLT
        43. 8.6.1.43 PLL_CTRL
        44. 8.6.1.44 PIN_FUNCTION
        45. 8.6.1.45 GPIO_CONFIG
        46. 8.6.1.46 GPIO_IN
        47. 8.6.1.47 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
    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

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • RNF|26
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.6.1.6 BUCK2_CTRL1

Address: 0x06

D7 D6 D5 D4 D3 D2 D1 D0
EN_BUCK2 EN_PIN_CTRL2 BUCK2_EN_PIN_SELECT[1:0] EN_ROOF_FLOOR2 EN_RDIS2 BUCK2_FPWM BUCK2_FPWM_MP
Bits Field Type Default Description
7 EN_BUCK2 R/W X This bit enables the BUCK2 regulator.
0h = BUCK2 regulator is disabled
1h = BUCK2 regulator is enabled
6 EN_PIN_CTRL2 R/W X This bit enables the EN1, EN2, EN3 pin control for the BUCK2 regulator.
0h = Only the EN_BUCK2 bit controls BUCK2
1h = EN_BUCK2 bit AND ENx pin control BUCK2
5:4 BUCK2_EN_PIN_SELECT[1:0] R/W X This bit enables the EN1, EN2, EN3 pin control for the BUCK2 regulator.
0h = EN_BUCK2 bit AND EN1 pin control the BUCK2 regulator
1h = EN_BUCK2 bit AND EN2 pin control the BUCK2 regulator
2h = EN_BUCK2 bit AND EN3 pin control the BUCK2 regulator
3h = Reserved
3 EN_ROOF_FLOOR2 R/W 0h This bit enables the roof and floor control of EN1, EN2, EN3 pin if the EN_PIN_CTRL2 bit is set to 1h.
0h = Enable and disable (1/0) control
1h = Roof and floor (1/0) control
2 EN_RDIS2 R/W 1h Enable output discharge resistor when BUCK2 is disabled.
0h = Discharge resistor disabled
1h = Discharge resistor enabled
1 BUCK2_FPWM R/W X This bit forces the BUCK2 regulator to operate in PWM mode.
0h = Automatic transitions between PFM and PWM modes (AUTO mode)
1h = Forced to PWM operation
0 BUCK2_FPWM_MP R/W X This bit forces the BUCK2 regulator to operate always in multiphase and forced-PWM operation mode.
0h = Automatic phase adding and phase shedding
1h = Forced to multiphase operation; two phases in the 2-phase configuration