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

8.1 Overview

The LP8756x-Q1 is a high-efficiency, high-performance power supply device with four step-down DC/DC converter cores for automotive applications. Table 1 lists the output characteristics of the regulators.

Table 1. Supply Specification

DEVICE SUPPLY OUTPUT
VOUT RANGE RESOLUTION IMAX MAXIMUM OUTPUT CURRENT
LP87561-Q1 BUCK0, BUCK1, BUCK2, BUCK3
in one 4-phase output		 0.6 to 3.36 V 10 mV (0.6 V to 0.73 V)
5 mV (0.73 V to 1.4 V)
20 mV (1.4 V to 3.36 V)		 16 A
LP87562-Q1 BUCK0, BUCK1, BUCK2
in one 3-phase output		 0.6 to 3.36 V 10 mV (0.6 V to 0.73 V)
5 mV (0.73 V to 1.4 V)
20 mV (1.4 V to 3.36 V)		 12 A
BUCK3 in 1-phase output 0.6 to 3.36 V 10 mV (0.6 V to 0.73 V)
5 mV (0.73 V to 1.4 V)
20 mV (1.4 V to 3.36 V)		 4 A
LP87563-Q1 BUCK0, BUCK1
in one 2-phase output		 0.6 to 3.36 V 10 mV (0.6 V to 0.73 V)
5 mV (0.73 V to 1.4 V)
20 mV (1.4 V to 3.36 V)		 8 A
BUCK2 in 1-phase output 0.6 to 3.36 V 10 mV (0.6 V to 0.73 V)
5 mV (0.73 V to 1.4 V)
20 mV (1.4 V to 3.36 V)		 4 A
BUCK3 in 1-phase output 0.6 to 3.36 V 10 mV (0.6 V to 0.73 V)
5 mV (0.73 V to 1.4 V)
20 mV (1.4 V to 3.36 V)		 4 A
LP87564-Q1 BUCK0 in 1-phase output 0.6 to 3.36 V 10 mV (0.6 V to 0.73 V)
5 mV (0.73 V to 1.4 V)
20 mV (1.4 V to 3.36 V)		 4 A
BUCK1 in 1-phase output 0.6 to 3.36 V 10 mV (0.6 V to 0.73 V)
5 mV (0.73 V to 1.4 V)
20 mV (1.4 V to 3.36 V)		 4 A
BUCK2 in 1-phase output 0.6 to 3.36 V 10 mV (0.6 V to 0.73 V)
5 mV (0.73 V to 1.4 V)
20 mV (1.4 V to 3.36 V)		 4 A
BUCK3 in 1-phase output 0.6 to 3.36 V 10 mV (0.6 V to 0.73 V)
5 mV (0.73 V to 1.4 V)
20 mV (1.4 V to 3.36 V)		 4 A
LP87565-Q1 BUCK0, BUCK1
in 2-phase output		 0.6 to 3.36 V 10 mV (0.6 V to 0.73 V)
5 mV (0.73 V to 1.4 V)
20 mV (1.4 V to 3.36 V)		 8 A
BUCK2, BUCK3
in 2-phase output		 0.6 to 3.36 V 10 mV (0.6 V to 0.73 V)
5 mV (0.73 V to 1.4 V)
20 mV (1.4 V to 3.36 V)		 8 A

The LP8756x-Q1 also supports switching clock synchronization to an external clock. The nominal frequency of the external clock can be from 1 MHz to 24 MHz with 1-MHz steps.

Additional features include:

  • Soft start
  • Input voltage protection:
    • Undervoltage lockout
    • Overvoltage protection
  • Output voltage monitoring and protection:
    • Overvoltage monitoring
    • Undervoltage monitoring
    • Overload protection
  • Thermal warning
  • Thermal shutdown

Three enable signals can be multiplexed to general purpose I/O (GPIO) signals. The direction and output type (open-drain or push-pull) are programmable for the GPIOs.