Datasheet LTC7891 (Analog Devices) - 10
| Hersteller | Analog Devices |
| Beschreibung | 100 V, Low IQ, Synchronous Step-Down Controller for GaN FETs in 28-Lead QFN (4mm x 5mm, Plastic Side Wettable) package |
| Seiten / Seite | 36 / 10 — LTC7891. TYPICAL PERFORMANCE CHARACTERISTICS. Figure 10. Inductor Current … |
| Dateiformat / Größe | PDF / 1.7 Mb |
| Dokumentensprache | Englisch |
LTC7891. TYPICAL PERFORMANCE CHARACTERISTICS. Figure 10. Inductor Current at Light Load
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LTC7891 TYPICAL PERFORMANCE CHARACTERISTICS Figure 10. Inductor Current at Light Load Figure 13. Maximum Current Sense Threshold vs. VITH Figure 11. Soft Startup Figure 14. SENSE– Pin Input Bias Current vs. Temperature Figure 12. Regulated Feedback Voltage vs. Temperature Figure 15. SENSE– Pin and SENSE+ Pin Input Current vs. VSENSE Common- Mode Voltage analog.com Rev. A | 10 of 36
Document Outline Features Applications Typical Application Circuit General Description Specifications Electrical Characteristics Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Functional Diagram Main Control Loop Power and Bias Supplies (VIN, EXTVCC, DRVCC, and INTVCC) High-Side Bootstrap Capacitor Dead Time Control (DTCA and DTCB Pins) Startup and Shutdown (RUN and TRACK/SS Pins) Light Load Operation: Burst Mode Operation, Pulse Skipping Mode, or Forced Continuous Mode (MODE Pin) Frequency Selection, Spread Spectrum, and Phase-Locked Loop (FREQ and PLLIN/SPREAD Pins) Output Overvoltage Protection Foldback Current Power Good Applications Information Inductor Value Calculation Inductor Core Selection Current Sense Selection Low Value Resistor Current Sensing Inductor DCR Current Sensing Setting the Operating Frequency Selecting the Light Load Operating Mode Dead Time Control (DTCA and DTCB Pins) DTCx Pins Tied to GND (Adaptive Dead Time Control) DTCx Pins Tied to INTVCC (Smart Near Zero Dead Time Control) DTCx Pins Connected with a Resistor to GND Power FET Selection CIN and COUT Selection Setting the Output Voltage RUN Pin and Undervoltage Lockout Soft Start and Tracking (TRACK/SS Pin) INTVCC Regulators (OPTI-DRIVE) Topside FET Driver Supply (CB) Minimum On Time Considerations Fault Conditions: Current Limit and Foldback Fault Conditions: Overvoltage Protection Fault Conditions: Overtemperature Protection Phase-Locked Loop and Frequency Synchronization Efficiency Considerations Checking Transient Response Design Example PCB Layout Checklist PCB Layout Debugging Typical Applications Related Products Outline Dimensions Ordering Guide Evaluation Boards Automotive Products
LTC7891 TYPICAL PERFORMANCE CHARACTERISTICS Figure 10. Inductor Current at Light Load Figure 13. Maximum Current Sense Threshold vs. VITH Figure 11. Soft Startup Figure 14. SENSE– Pin Input Bias Current vs. Temperature Figure 12. Regulated Feedback Voltage vs. Temperature Figure 15. SENSE– Pin and SENSE+ Pin Input Current vs. VSENSE Common- Mode Voltage analog.com Rev. A | 10 of 36
Document Outline Features Applications Typical Application Circuit General Description Specifications Electrical Characteristics Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Functional Diagram Main Control Loop Power and Bias Supplies (VIN, EXTVCC, DRVCC, and INTVCC) High-Side Bootstrap Capacitor Dead Time Control (DTCA and DTCB Pins) Startup and Shutdown (RUN and TRACK/SS Pins) Light Load Operation: Burst Mode Operation, Pulse Skipping Mode, or Forced Continuous Mode (MODE Pin) Frequency Selection, Spread Spectrum, and Phase-Locked Loop (FREQ and PLLIN/SPREAD Pins) Output Overvoltage Protection Foldback Current Power Good Applications Information Inductor Value Calculation Inductor Core Selection Current Sense Selection Low Value Resistor Current Sensing Inductor DCR Current Sensing Setting the Operating Frequency Selecting the Light Load Operating Mode Dead Time Control (DTCA and DTCB Pins) DTCx Pins Tied to GND (Adaptive Dead Time Control) DTCx Pins Tied to INTVCC (Smart Near Zero Dead Time Control) DTCx Pins Connected with a Resistor to GND Power FET Selection CIN and COUT Selection Setting the Output Voltage RUN Pin and Undervoltage Lockout Soft Start and Tracking (TRACK/SS Pin) INTVCC Regulators (OPTI-DRIVE) Topside FET Driver Supply (CB) Minimum On Time Considerations Fault Conditions: Current Limit and Foldback Fault Conditions: Overvoltage Protection Fault Conditions: Overtemperature Protection Phase-Locked Loop and Frequency Synchronization Efficiency Considerations Checking Transient Response Design Example PCB Layout Checklist PCB Layout Debugging Typical Applications Related Products Outline Dimensions Ordering Guide Evaluation Boards Automotive Products