SNVSAW2B April   2017  – December 2018 LP87524B-Q1 , LP87524J-Q1 , LP87524P-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 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 I2C Serial Bus Timing Requirements
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Descriptions
      1. 7.3.1 DC-DC Converters
        1. 7.3.1.1 Overview
        2. 7.3.1.2 Transition Between PWM and PFM Modes
        3. 7.3.1.3 Buck Converter Load-Current Measurement
        4. 7.3.1.4 Spread-Spectrum Mode
      2. 7.3.2 Sync Clock Functionality
      3. 7.3.3 Power-Up
      4. 7.3.4 Regulator Control
        1. 7.3.4.1 Enabling and Disabling Regulators
        2. 7.3.4.2 Changing Output Voltage
      5. 7.3.5 Enable and Disable Sequences
      6. 7.3.6 Device Reset Scenarios
      7. 7.3.7 Diagnostics and Protection Features
        1. 7.3.7.1 Power-Good Information (PGOOD pin)
        2. 7.3.7.2 Warnings for Diagnostics (Interrupt)
          1. 7.3.7.2.1 Output Power Limit
          2. 7.3.7.2.2 Thermal Warning
        3. 7.3.7.3 Protection (Regulator Disable)
          1. 7.3.7.3.1 Short-Circuit and Overload Protection
          2. 7.3.7.3.2 Overvoltage Protection
          3. 7.3.7.3.3 Thermal Shutdown
        4. 7.3.7.4 Fault (Power Down)
          1. 7.3.7.4.1 Undervoltage Lockout
      8. 7.3.8 GPIO Signal Operation
      9. 7.3.9 Digital Signal Filtering
    4. 7.4 Device Functional Modes
      1. 7.4.1 Modes of Operation
    5. 7.5 Programming
      1. 7.5.1 I2C-Compatible Interface
        1. 7.5.1.1 Data Validity
        2. 7.5.1.2 Start and Stop Conditions
        3. 7.5.1.3 Transferring Data
        4. 7.5.1.4 I2C-Compatible Chip Address
        5. 7.5.1.5 Auto-Increment Feature
    6. 7.6 Register Maps
      1. 7.6.1 Register Descriptions
        1. 7.6.1.1  OTP_REV
          1. Table 10. OTP_REV Register Field Descriptions
        2. 7.6.1.2  BUCK0_CTRL1
          1. Table 11. BUCK0_CTRL1 Register Field Descriptions
        3. 7.6.1.3  BUCK1_CTRL1
          1. Table 12. BUCK1_CTRL1 Register Field Descriptions
        4. 7.6.1.4  BUCK2_CTRL1
          1. Table 13. BUCK2_CTRL1 Register Field Descriptions
        5. 7.6.1.5  BUCK3_CTRL1
          1. Table 14. BUCK3_CTRL1 Register Field Descriptions
        6. 7.6.1.6  BUCK0_VOUT
          1. Table 15. BUCK0_VOUT Register Field Descriptions
        7. 7.6.1.7  BUCK0_FLOOR_VOUT
          1. Table 16. BUCK0_FLOOR_VOUT Register Field Descriptions
        8. 7.6.1.8  BUCK1_VOUT
          1. Table 17. BUCK1_VOUT Register Field Descriptions
        9. 7.6.1.9  BUCK1_FLOOR_VOUT
          1. Table 18. BUCK1_FLOOR_VOUT Register Field Descriptions
        10. 7.6.1.10 BUCK2_VOUT
          1. Table 19. BUCK2_VOUT Register Field Descriptions
        11. 7.6.1.11 BUCK2_FLOOR_VOUT
          1. Table 20. BUCK2_FLOOR_VOUT Register Field Descriptions
        12. 7.6.1.12 BUCK3_VOUT
          1. Table 21. BUCK3_VOUT Register Field Descriptions
        13. 7.6.1.13 BUCK3_FLOOR_VOUT
          1. Table 22. BUCK3_FLOOR_VOUT Register Field Descriptions
        14. 7.6.1.14 BUCK0_DELAY
          1. Table 23. BUCK0_DELAY Register Field Descriptions
        15. 7.6.1.15 BUCK1_DELAY
          1. Table 24. BUCK1_DELAY Register Field Descriptions
        16. 7.6.1.16 BUCK2_DELAY
          1. Table 25. BUCK2_DELAY Register Field Descriptions
        17. 7.6.1.17 BUCK3_DELAY
          1. Table 26. BUCK3_DELAY Register Field Descriptions
        18. 7.6.1.18 GPIO2_DELAY
          1. Table 27. GPIO2_DELAY Register Field Descriptions
        19. 7.6.1.19 GPIO3_DELAY
          1. Table 28. GPIO3_DELAY Register Field Descriptions
        20. 7.6.1.20 RESET
          1. Table 29. RESET Register Field Descriptions
        21. 7.6.1.21 CONFIG
          1. Table 30. CONFIG Register Field Descriptions
        22. 7.6.1.22 INT_TOP1
          1. Table 31. INT_TOP1 Register Field Descriptions
        23. 7.6.1.23 INT_TOP2
          1. Table 32. INT_TOP2 Register Field Descriptions
        24. 7.6.1.24 INT_BUCK_0_1
          1. Table 33. INT_BUCK_0_1 Register Field Descriptions
        25. 7.6.1.25 INT_BUCK_2_3
          1. Table 34. INT_BUCK_2_3 Register Field Descriptions
        26. 7.6.1.26 TOP_STAT
          1. Table 35. TOP_STAT Register Field Descriptions
        27. 7.6.1.27 BUCK_0_1_STAT
          1. Table 36. BUCK_0_1_STAT Register Field Descriptions
        28. 7.6.1.28 BUCK_2_3_STAT
          1. Table 37. BUCK_2_3_STAT Register Field Descriptions
        29. 7.6.1.29 TOP_MASK1
          1. Table 38. TOP_MASK1 Register Field Descriptions
        30. 7.6.1.30 TOP_MASK2
          1. Table 39. TOP_MASK2 Register Field Descriptions
        31. 7.6.1.31 BUCK_0_1_MASK
          1. Table 40. BUCK_0_1_MASK Register Field Descriptions
        32. 7.6.1.32 BUCK_2_3_MASK
          1. Table 41. BUCK_2_3_MASK Register Field Descriptions
        33. 7.6.1.33 SEL_I_LOAD
          1. Table 42. SEL_I_LOAD Register Field Descriptions
        34. 7.6.1.34 I_LOAD_2
          1. Table 43. I_LOAD_2 Register Field Descriptions
        35. 7.6.1.35 I_LOAD_1
          1. Table 44. I_LOAD_1 Register Field Descriptions
        36. 7.6.1.36 PGOOD_CTRL1
          1. Table 45. PGOOD_CTRL1 Register Field Descriptions
        37. 7.6.1.37 PGOOD_CTRL2
          1. Table 46. PGOOD_CTRL2 Register Field Descriptions
        38. 7.6.1.38 PGOOD_FLT
          1. Table 47. PGOOD_FLT Register Field Descriptions
        39. 7.6.1.39 PLL_CTRL
          1. Table 48. PLL_CTRL Register Field Descriptions
        40. 7.6.1.40 PIN_FUNCTION
          1. Table 49. PIN_FUNCTION Register Field Descriptions
        41. 7.6.1.41 GPIO_CONFIG
          1. Table 50. GPIO_CONFIG Register Field Descriptions
        42. 7.6.1.42 GPIO_IN
          1. Table 51. GPIO_IN Register Field Descriptions
        43. 7.6.1.43 GPIO_OUT
          1. Table 52. GPIO_OUT Register Field Descriptions
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
        1. 8.2.1.1 Inductor Selection
        2. 8.2.1.2 Input Capacitor Selection
        3. 8.2.1.3 Output Capacitor Selection
        4. 8.2.1.4 Snubber Components
        5. 8.2.1.5 Supply Filtering Components
      2. 8.2.2 Current Limit vs. Maximum Output Current
      3. 8.2.3 Detailed Design Procedure
      4. 8.2.4 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Related Links
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Community Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  12. 12Mechanical, Packaging, and Orderable Information
  13. 12Mechanical, 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

7.3.5 Enable and Disable Sequences

The LP87524B/J/P-Q1 device supports start-up and shutdown sequencing with programmable delays for different regulator outputs using single EN1/2/3 control signal. The regulator is selected for delayed control with:

  • EN_BUCKx = 1 (in BUCKx_CTRL1 register)
  • EN_PIN_CTRLx = 1 (in BUCKx_CTRL1 register)
  • EN_ROOF_FLOORx = 0 (in BUCKx_CTRL1 register)
  • BUCKx_VSET[7:0] = Required voltage when ENx is high (in BUCKx_VOUT register)
  • The ENABLE pin for control is selected with BUCKx_EN_PIN_SELECT[1:0] (in BUCKx_CTRL1 register)
  • The delay from rising edge of ENx signal to the regulator enable is set by BUCKx_STARTUP_DELAY[3:0] bits (in BUCKx_DELAY register) and
  • The delay from falling edge of ENx signal to the regulator disable is set by BUCKx_SHUTDOWN_DELAY[3:0] bits (in BUCKx_DELAY register)

There are four time steps available for start-up and shutdown sequences. The delay times are selected with DOUBLE_DELAY bit in CONFIG register and HALF_DELAY bit in PGOOD_CTRL2 register as shown in Table 4.

Table 4. Start-up and Shutdown Delays

X_STARTUP_DELAY /
X_SHUTDOWN_DELAY		 DOUBLE_DELAY = 0
HALF_DELAY = 1		 DOUBLE_DELAY = 1
HALF_DELAY = 1		 DOUBLE_DELAY = 0
HALF_DELAY = 0		 DOUBLE_DELAY = 1
HALF_DELAY = 0
0000 0 ms 0 ms 0 ms 0 ms
0001 0.32 ms 0.64 ms 1 ms 2 ms
0010 0.64 ms 1.28 ms 2 ms 4 ms
0011 0.96 ms 1.92 ms 3 ms 6 ms
0100 1.28 ms 2.56 ms 4 ms 8 ms
0101 1.6 ms 3.2 ms 5 ms 10 ms
0110 1.92 ms 3.84 ms 6 ms 12 ms
0111 2.24 ms 4.48 ms 7 ms 14 ms
1000 2.56 ms 5.12 ms 8 ms 16 ms
1001 2.88 ms 5.76 ms 9 ms 18 ms
1010 3.2 ms 6.4 ms 10 ms 20 ms
1011 3.52 ms 7.04 ms 11 ms 22 ms
1100 3.84 ms 7.68 ms 12 ms 24 ms
1101 4.16 ms 8.32 ms 13 ms 26 ms
1110 4.48 ms 8.96 ms 14 ms 28 ms
1111 4.8 ms 9.6 ms 15 ms 30 ms

An example of start-up and shutdown sequences is shown in Figure 10 and Figure 11. The start-up and shutdown delays for the Buck0/1 regulators are 1 ms and 4 ms and for the Buck2/3 regulators 3 ms and 1 ms. The delay settings are used only for enable/disable control with EN1/2/3 signals, not for Roof/Floor control.

LP87524B-Q1 LP87524J-Q1 LP87524P-Q1 Sequencing.gifFigure 10. Typical Start-Up and Shutdown Sequencing
LP87524B-Q1 LP87524J-Q1 LP87524P-Q1 Sequencing_2.gifFigure 11. Start-Up and Shutdown Sequencing With Short ENx Low and High Periods