SLVSES8A October   2020  – December 2020 LM5127-Q1

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Pin Configuration and 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 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Device Enable (EN, VCC_HOLD)
      2. 8.3.2  Dual Input VCC Regulator (BIAS, VCCX, VCC)
      3. 8.3.3  Dual Input VDD Switch (VDD, VDDX)
      4. 8.3.4  Device Configuration and Light Load Switching Mode Selection (CFG/MODE)
      5. 8.3.5  Fixed or Adjustable Output Regulation Target (VOUT, FB)
      6. 8.3.6  Overvoltage Protection (VOUT, FB)
      7. 8.3.7  Power Good Indicator (PGOOD)
      8. 8.3.8  Programmable Switching Frequency (RT)
      9. 8.3.9  External Clock Synchronization (SYNC)
      10. 8.3.10 Programmable Spread Spectrum (DITHER)
      11. 8.3.11 Programmable Soft Start (SS)
      12. 8.3.12 Fast Re-start using VCC_HOLD (VCC_HOLD)
      13. 8.3.13 Transconductance Error Amplifier and PWM (COMP)
      14. 8.3.14 Current Sensing and Slope Compensation (CSA, CSB)
      15. 8.3.15 Constant Peak Current Limit (CSA, CSB)
      16. 8.3.16 Maximum Duty Cycle and Minimum Controllable On-time Limits (Boost)
      17. 8.3.17 Bypass Mode (Boost)
      18. 8.3.18 Minimum Controllable On-time and Minimum Controllable Off-time Limits (Buck)
      19. 8.3.19 Low Dropout Mode for Extended Minimum Input Voltage (Buck)
      20. 8.3.20 Programmable Hiccup Mode Overload Protection (RES)
      21. 8.3.21 MOSFET Drivers and Hiccup Mode Fault Protection (LO, HO, HB)
      22. 8.3.22 Battery Monitor (BMOUT, BMIN_FIX, BMIN_PRG)
      23. 8.3.23 Dual-phase Interleaved Configuration for High Current Supply (CFG)
      24. 8.3.24 Thermal Shutdown Protection
      25. 8.3.25 External VCCX Supply Reduces Power Dissipation
    4. 8.4 Device Functional Modes
      1. 8.4.1 Device Status
        1. 8.4.1.1 Shutdown Mode
        2. 8.4.1.2 Configuration Mode
        3. 8.4.1.3 Active Mode
        4. 8.4.1.4 Sleep Mode
        5. 8.4.1.5 Deep Sleep Mode
          1. 8.4.1.5.1 Cutting Leakage Path in Deep Sleep Mode (DIS, SLEEP1, SENSE1)
        6. 8.4.1.6 VCC HOLD Mode
      2. 8.4.2 Light Load Switching Mode
        1. 8.4.2.1 Forced PWM (FPWM) Operation
        2. 8.4.2.2 Diode Emulation (DE) Operation (Connect RSS at SS)
        3. 8.4.2.3 Forced Diode Emulation Operation in FPWM Mode
        4. 8.4.2.4 Skip Mode Operation
      3. 8.4.3 LM5127 Cheat Sheet
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Recommended Power Tree Architecture
        2. 9.2.2.2 Application Ideas
      3. 9.2.3 Application Curves
    3. 9.3 System Examples
  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. 12.1.2 Development Support
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Receiving Notification of Documentation Updates
    4. 12.4 Support Resources
    5. 12.5 Trademarks
    6. 12.6 Electrostatic Discharge Caution
    7. 12.7 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

8.4.3 LM5127 Cheat Sheet

Table 8-11 LM5127 Cheat Sheet
DEVICE CONFIGURATONNOTES
Boost/SEPIC + Buck + BuckConfiguration is latched during initial start-up.
Boost/SEPIC + 2PH BuckConfiguration is latched during initial start-up.
Buck + Buck + BuckConfiguration is latched during initial start-up.
Buck + 2PH BuckConfiguration is latched during initial start-up.
OUTPUT REGULATION SELECTIONNOTES
Fixed 3.3 VSupported in buck. The regulation target is latched during initial start-up.
Fixed 5.0 VSupported in buck. The regulation target is latched during initial start-up.
Adjustable from 0.8 to 42 VSupported in boost and buck. Dynamically programmable during operation.
LIGHT LOAD SWITCHING MODENOTES
Skip modeApply to all channels. The mode is latched during initial start-up.
FPWM modeApply to all channels. The mode is latched during initial start-up.
DE operation in FPWM modeDynamically changeable between FPWM and DE during operation.
HICCUP MODE PROTECTIONNOTES
Hiccup mode protectionApply to all channels. The mode is latched during initial start-up.
Latch-off mode protectionApply to all channels. The mode is latched during initial start-up.
Cycle-by-cycle current limitApply to all channels. The mode is latched during initial start-up.
SWITCHING FREQUENCYNOTES
RT programmingApply to all channels. Dynamically programmable during operation.
SYNCApply to all channels. Dynamically programmable during operation. Dynamically changeable between SYNC and RT switching during operation.
DITHERApply to all channels. Dynamically programmable during operation. Dynamically changeable between DITHER and RT switching during operation.
FUNCTIONNOTES
EnableDedicated pin per channel
Soft-startDedicated pin per channel. SS3 is disabled in dual-phase buck.
PGOODDedicated pin per channel. PGOOD3 is disabled in dual-phase buck.
DEVICE/CHANNEL STATUSNOTES
Shutdown modeApply to all channels.
Configuration modeApply to all channels.
Active modeEach channel works individually.
Sleep modeEach channel works individually.
Deep sleep modeApply to all channels.
VCC HOLD modeApply to all channels.
PULSE WIDTH MODULATION TYPENOTES
Normal PWM operationAvailable in both boost and buck.
Pulse skipping operationAvailable in both boost and buck.
Bypass mode operationAvailable in boost.
LDO mode operationAvailable in buck.
SPECIAL DEVICE/CHANNEL STATUSNOTES
Hiccup mode offEach channel enters hiccup mode off individually. CH2 and CH3 enter hiccup mode off together in dual-phase buck. Automatic restart if hiccup mode is selected.
OVP protectionEach channel stops switching individually. Disabled in boost. Restarts naturally
Thermal ShutdownAll channels shutdown. Restarts naturally.