Datasheet LTC7804 (Analog Devices) - 2
| Manufacturer | Analog Devices |
| Description | Low IQ Synchronous Boost Controller |
| Pages / Page | 34 / 2 — TABLE OF CONTENTS Features ... 1. Applications Information ..15. … |
| File Format / Size | PDF / 1.5 Mb |
| Document Language | English |
TABLE OF CONTENTS Features ... 1. Applications Information ..15. Applications .. 1. Typical Application .. 1. Description.. 1
Model Line for this Datasheet
- LTC7804EMSE#PBF LTC7804EMSE#TRPBF LTC7804EMSE#WPBF LTC7804EMSE#WTRPBF LTC7804EUD#PBF LTC7804EUD#TRPBF LTC7804EUD#WPBF LTC7804EUD#WTRPBF LTC7804HMSE#PBF LTC7804HMSE#TRPBF LTC7804HMSE#WPBF LTC7804HMSE#WTRPBF LTC7804HUD#PBF LTC7804HUD#TRPBF LTC7804HUD#WPBF LTC7804HUD#WTRPBF LTC7804IMSE#PBF LTC7804IMSE#TRPBF LTC7804IMSE#WPBF LTC7804IMSE#WTRPBF LTC7804IUD#PBF LTC7804IUD#TRPBF LTC7804IUD#WPBF LTC7804IUD#WTRPBF
Text Version of Document
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TABLE OF CONTENTS Features ... 1 Applications Information ..15 Applications .. 1
SENSE+ and SENSE– Pins ...15
Typical Application .. 1
Low Value Resistor Current Sensing...16
Description.. 1
Inductor DCR Sensing ..16
Absolute Maximum Ratings .. 3
Inductor Value Calculation ..17
Pin Configuration .. 3
Inductor Core Selection ..17
Order Information .. 4
Power MOSFET Selection ...18
Electrical Characteristics ... 5
CIN and COUT Selection ...18
Typical Performance Characteristics ... 7
Setting Output Voltage ..19
Pin Functions ..10
RUN Pin ..19
Block Diagram ...11
Soft-Start (SS Pin) ..20
Operation...12
INTVCC Regulators ..20 Main Control Loop ..12 Topside MOSFET Driver Supply (CB, DB) ..21 INTVCC/EXTVCC Power ..12 Phase-Locked Loop and Frequency Boost Supply and Dropout (BOOST and SW Pins) ..12 Synchronization .. 21 Shutdown and Start-Up (RUN, SS Pins) ..12 Setting the Operating Frequency ...22 Light Load Current Operation: Burst Mode Selecting the Light-Load Operating Mode ...23 Operation, Pulse-Skipping or Forced Continuous Minimum On-Time Considerations ...23 Mode (MODE Pin) ...12 Fault Conditions: Overtemperature Protection ..24 Frequency Selection, Spread Spectrum and Phase- Efficiency Considerations ..24 Locked-Loop (FREQ and PLLIN/SPREAD Pins) ..13 Checking Transient Response ...24 Operation When VIN > VOUT ..14 Design Example ..25 Operation at Low Input Voltage...14 PC Board Layout Checklist ..26 BOOST Supply Refresh and Internal Charge Pump .14 PC Board Layout Debugging ...27
Typical Applications ..28 Package Description ...32 Typical Application ...34 Related Parts ..34
Rev. 0 2 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Main Control Loop INTVCC/EXTVCC Power Boost Supply and Dropout (BOOST and SW Pins) Shutdown and Start-Up (RUN, SS Pins) Light Load Current 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) Operation When VIN > VOUT Operation at Low Input Voltage BOOST Supply Refresh and Internal Charge Pump Applications Information SENSE+ and SENSE– Pins Low Value Resistor Current Sensing Inductor DCR Sensing Inductor Value Calculation Inductor Core Selection Power MOSFET Selection CIN and COUT Selection Setting Output Voltage RUN Pin Soft-Start (SS Pin) INTVCC Regulators Topside MOSFET Driver Supply (CB, DB) Phase-Locked Loop and Frequency Synchronization Setting the Operating Frequency Selecting the Light-Load Operating Mode Minimum On-Time Considerations Fault Conditions: Overtemperature Protection Efficiency Considerations Checking Transient Response Design Example PC Board Layout Checklist PC Board Layout Debugging Package Description Typical Application Related Parts
TABLE OF CONTENTS Features ... 1 Applications Information ..15 Applications .. 1
SENSE+ and SENSE– Pins ...15
Typical Application .. 1
Low Value Resistor Current Sensing...16
Description.. 1
Inductor DCR Sensing ..16
Absolute Maximum Ratings .. 3
Inductor Value Calculation ..17
Pin Configuration .. 3
Inductor Core Selection ..17
Order Information .. 4
Power MOSFET Selection ...18
Electrical Characteristics ... 5
CIN and COUT Selection ...18
Typical Performance Characteristics ... 7
Setting Output Voltage ..19
Pin Functions ..10
RUN Pin ..19
Block Diagram ...11
Soft-Start (SS Pin) ..20
Operation...12
INTVCC Regulators ..20 Main Control Loop ..12 Topside MOSFET Driver Supply (CB, DB) ..21 INTVCC/EXTVCC Power ..12 Phase-Locked Loop and Frequency Boost Supply and Dropout (BOOST and SW Pins) ..12 Synchronization .. 21 Shutdown and Start-Up (RUN, SS Pins) ..12 Setting the Operating Frequency ...22 Light Load Current Operation: Burst Mode Selecting the Light-Load Operating Mode ...23 Operation, Pulse-Skipping or Forced Continuous Minimum On-Time Considerations ...23 Mode (MODE Pin) ...12 Fault Conditions: Overtemperature Protection ..24 Frequency Selection, Spread Spectrum and Phase- Efficiency Considerations ..24 Locked-Loop (FREQ and PLLIN/SPREAD Pins) ..13 Checking Transient Response ...24 Operation When VIN > VOUT ..14 Design Example ..25 Operation at Low Input Voltage...14 PC Board Layout Checklist ..26 BOOST Supply Refresh and Internal Charge Pump .14 PC Board Layout Debugging ...27
Typical Applications ..28 Package Description ...32 Typical Application ...34 Related Parts ..34
Rev. 0 2 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Main Control Loop INTVCC/EXTVCC Power Boost Supply and Dropout (BOOST and SW Pins) Shutdown and Start-Up (RUN, SS Pins) Light Load Current 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) Operation When VIN > VOUT Operation at Low Input Voltage BOOST Supply Refresh and Internal Charge Pump Applications Information SENSE+ and SENSE– Pins Low Value Resistor Current Sensing Inductor DCR Sensing Inductor Value Calculation Inductor Core Selection Power MOSFET Selection CIN and COUT Selection Setting Output Voltage RUN Pin Soft-Start (SS Pin) INTVCC Regulators Topside MOSFET Driver Supply (CB, DB) Phase-Locked Loop and Frequency Synchronization Setting the Operating Frequency Selecting the Light-Load Operating Mode Minimum On-Time Considerations Fault Conditions: Overtemperature Protection Efficiency Considerations Checking Transient Response Design Example PC Board Layout Checklist PC Board Layout Debugging Package Description Typical Application Related Parts
