Datasheet LTC7810 (Analog Devices) - 2
| Manufacturer | Analog Devices |
| Description | 150V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller with PassThru |
| Pages / Page | 42 / 2 — TABLE OF CONTENTS. Features ... 1. Applications .. 1. Typical Application … |
| Revision | A |
| File Format / Size | PDF / 4.0 Mb |
| Document Language | English |
TABLE OF CONTENTS. Features ... 1. Applications .. 1. Typical Application .. 1. Description.. 1. Absolute Maximum Ratings .. 3
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TABLE OF CONTENTS Features ... 1
Inductor Core Selection ..21
Applications .. 1
Power MOSFET Selection ...21
Typical Application .. 1
CIN and COUT Selection ...22
Description.. 1
Setting the Output Voltage ..22
Absolute Maximum Ratings .. 3
RUN Pins and Overvoltage/Undervoltage
Order Information .. 3
Lockout ...23
Pin Configuration .. 3
Tracking and Soft-Start (TRACK/SS1,
Electrical Characteristics ... 4
TRACK/SS2 Pins) ... 24
Typical Performance Characteristics ... 7
Single Output Two-Phase Operation ...25
Pin Functions ..10
DRVCC Regulators ...25
Functional Diagram ..12
Topside MOSFET Driver Supply (CB, DB) ..27
Operation...13
Burst Clamp Programming ...28 Main Control Loop .. 13 Fault Conditions: Current Limit and Power and Bias Supplies (VIN, NDRV, EXTVCC, Current Foldback ...29 DRVCC, REGSD) .. 13 Fault Conditions: Overvoltage Boost Supply and Dropout (BOOST and Protection (Crowbar) ..29 SW pins) ... 14 Fault Conditions: Overtemperature Protection ..29 Start-Up and Shutdown (RUN, TRACK/SS, Phase-Locked Loop and Frequency OVLO Pins) ... 14 Synchronization ..29 Light Load Operation: Burst Mode Operation, Minimum On-Time Considerations..30 Pulse Skipping or Forced Continuous Efficiency Considerations ...30 Mode (MODE Pin) ... 14 Checking Transient Response ...31 Frequency Selection, Spread Spectrum, Design Example ..32 and Phase-Locked Loop (FREQ and PC Board Layout Checklist ...33 PLLIN/SPREAD Pins) .. 16 PC Board Layout Debugging ...35
Applications Information ..17 Typical Applications ..36
Current Sense Selection ... 17
Package Description ...40
Low Value Resistor Current Sensing ... 17
Revision History ..41
Inductor DCR Sensing .. 17
Typical Application ...42
Setting the Operating Frequency... 19
Related Parts ..42
Selecting the Light-Load Operating Mode ... 19 Inductor Value Calculation ..20 Rev. A 2 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Main Control Loop Power and Bias Supplies (VIN, NDRV, EXTVCC, DRVCC, REGSD) Boost Supply and Dropout (BOOST and SW pins) Start-Up and Shutdown (RUN, TRACK/SS, OVLO Pins) Light Load Operation: Burst Mode Operation, Pulse Skipping or Forced Continuous Mode (MODE Pin) Frequency Selection, Spread Spectrum, and Phase-Locked Loop (FREQ and PLLIN/SPREAD Pins) Applications Information Current Sense Selection Low Value Resistor Current Sensing Inductor DCR Sensing Setting the Operating Frequency Selecting the Light-Load Operating Mode Inductor Value Calculation Inductor Core Selection Power MOSFET Selection CIN and COUT Selection Setting the Output Voltage RUN Pins and Overvoltage/Undervoltage Lockout Tracking and Soft-Start (TRACK/SS1, TRACK/SS2 Pins) Single Output Two-Phase Operation DRVCC Regulators Topside MOSFET Driver Supply (CB, DB) Burst Clamp Programming Fault Conditions: Current Limit and Current Foldback Fault Conditions: Overvoltage Protection (Crowbar) Fault Conditions: Overtemperature Protection Phase-Locked Loop and Frequency Synchronization Minimum On-Time Considerations Efficiency Considerations Checking Transient Response Design Example PC Board Layout Checklist PC Board Layout Debugging Typical Applications Package Description Revision History Typical Application Related Parts
TABLE OF CONTENTS Features ... 1
Inductor Core Selection ..21
Applications .. 1
Power MOSFET Selection ...21
Typical Application .. 1
CIN and COUT Selection ...22
Description.. 1
Setting the Output Voltage ..22
Absolute Maximum Ratings .. 3
RUN Pins and Overvoltage/Undervoltage
Order Information .. 3
Lockout ...23
Pin Configuration .. 3
Tracking and Soft-Start (TRACK/SS1,
Electrical Characteristics ... 4
TRACK/SS2 Pins) ... 24
Typical Performance Characteristics ... 7
Single Output Two-Phase Operation ...25
Pin Functions ..10
DRVCC Regulators ...25
Functional Diagram ..12
Topside MOSFET Driver Supply (CB, DB) ..27
Operation...13
Burst Clamp Programming ...28 Main Control Loop .. 13 Fault Conditions: Current Limit and Power and Bias Supplies (VIN, NDRV, EXTVCC, Current Foldback ...29 DRVCC, REGSD) .. 13 Fault Conditions: Overvoltage Boost Supply and Dropout (BOOST and Protection (Crowbar) ..29 SW pins) ... 14 Fault Conditions: Overtemperature Protection ..29 Start-Up and Shutdown (RUN, TRACK/SS, Phase-Locked Loop and Frequency OVLO Pins) ... 14 Synchronization ..29 Light Load Operation: Burst Mode Operation, Minimum On-Time Considerations..30 Pulse Skipping or Forced Continuous Efficiency Considerations ...30 Mode (MODE Pin) ... 14 Checking Transient Response ...31 Frequency Selection, Spread Spectrum, Design Example ..32 and Phase-Locked Loop (FREQ and PC Board Layout Checklist ...33 PLLIN/SPREAD Pins) .. 16 PC Board Layout Debugging ...35
Applications Information ..17 Typical Applications ..36
Current Sense Selection ... 17
Package Description ...40
Low Value Resistor Current Sensing ... 17
Revision History ..41
Inductor DCR Sensing .. 17
Typical Application ...42
Setting the Operating Frequency... 19
Related Parts ..42
Selecting the Light-Load Operating Mode ... 19 Inductor Value Calculation ..20 Rev. A 2 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Main Control Loop Power and Bias Supplies (VIN, NDRV, EXTVCC, DRVCC, REGSD) Boost Supply and Dropout (BOOST and SW pins) Start-Up and Shutdown (RUN, TRACK/SS, OVLO Pins) Light Load Operation: Burst Mode Operation, Pulse Skipping or Forced Continuous Mode (MODE Pin) Frequency Selection, Spread Spectrum, and Phase-Locked Loop (FREQ and PLLIN/SPREAD Pins) Applications Information Current Sense Selection Low Value Resistor Current Sensing Inductor DCR Sensing Setting the Operating Frequency Selecting the Light-Load Operating Mode Inductor Value Calculation Inductor Core Selection Power MOSFET Selection CIN and COUT Selection Setting the Output Voltage RUN Pins and Overvoltage/Undervoltage Lockout Tracking and Soft-Start (TRACK/SS1, TRACK/SS2 Pins) Single Output Two-Phase Operation DRVCC Regulators Topside MOSFET Driver Supply (CB, DB) Burst Clamp Programming Fault Conditions: Current Limit and Current Foldback Fault Conditions: Overvoltage Protection (Crowbar) Fault Conditions: Overtemperature Protection Phase-Locked Loop and Frequency Synchronization Minimum On-Time Considerations Efficiency Considerations Checking Transient Response Design Example PC Board Layout Checklist PC Board Layout Debugging Typical Applications Package Description Revision History Typical Application Related Parts
