Datasheet LTC7892 (Analog Devices) - 7
| Hersteller | Analog Devices |
| Beschreibung | Low IQ, Dual, 2-Phase Synchronous Boost Controller for GaN FETs in 40-Lead QFN (6mm x 6mm, Plastic Side Wettable) package |
| Seiten / Seite | 50 / 7 — Data Sheet. LTC7892. PARAMETER. SYMBOL. CONDITIONS/COMMENTS. MIN. TYP. … |
| Dateiformat / Größe | PDF / 1.0 Mb |
| Dokumentensprache | Englisch |
Data Sheet. LTC7892. PARAMETER. SYMBOL. CONDITIONS/COMMENTS. MIN. TYP. MAX. UNITS. Spread Spectrum Oscillator and Phase-Locked Loop (PLL)
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Data Sheet LTC7892
(Specifications are at TJ = -40°C to +125°C for the minimum and maximum values, TA = 25°C for the typical values, VBIAS = 12V, RUN1 and RUN2 = 5V, VPRG1 = Float, EXTVCC = 0V, DRVSET = 0V, DRVUV = 0V, DTCA and DTCB = 0V, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS/COMMENTS MIN TYP MAX UNITS
DRVSET = INTVCC 5.2 5.5 5.7 V DRVSET = 0V 4.8 5.0 5.2 V DRVSET = 64.9kΩ 4.5 4.75 5.0 V DRV DRV CC load current = 0mA to 100mA, CC Load Regulation 1 3 % TA = 25°C DRVCC Rising DRVUV = INTVCC 4.8 5.0 5.2 V DRVUV = 0V 3.6 3.8 4.0 V DRVUV = floating 4.2 4.4 4.6 V Undervoltage Lockout UVLO DRVCC Falling DRVUV = INTVCC 4.55 4.75 4.95 V DRVUV = 0V 3.4 3.6 3.8 V DRVUV = floating 4.0 4.18 4.4 V EXTVCC LDO DRVUV = INTV 5.75 5.95 6.15 V Switchover Voltage CC or floating, TA = 25°C DRVUV = 0V, T 4.6 4.76 4.9 V EXTV A = 25°c CC Rising EXTVCC LDO DRVUV = INTV 390 mV Switchover Hysteresis CC or floating DRVUV = 0V 220 mV EXTVCC Falling
Spread Spectrum Oscillator and Phase-Locked Loop (PLL)
PLLIN/SPREAD = 0V FREQ = 0V, TA = 25°C 320 370 420 kHz FREQ = INTV Fixed Frequencies f CC 2.0 2.25 2.5 MHz OSC FREQ = 374kΩ 100 kHz FREQ = 75kΩ, TA = 25°C 450 500 550 kHz FREQ = 12.4kΩ 3 MHz Synchronizable f Frequency Range SYNC PLLIN/SPREAD = External Clock 0.1 3 MHz PLLIN Input 2.2 V High-Level PLLIN Input Low-Level 0.5 V Spread Spectrum PLLIN/SPREAD = INTVCC Frequency Range Minimum Frequency 0 % (Relative to fOSC) Maximum Frequency 20 %
analog.com
Rev. 0 7 of 50 Document Outline Features Applications General Description Typical Application Revision History Specifications Absolute Maximum Ratings Pin Configurations and Function Descriptions Typical Performance Characteristics Functional Diagram Theory of Operation Main Control Loop Power and Bias Supplies (VBIAS, EXTVCC, DRVCC, INTVCC) High Side Bootstrap Capacitor Dead Time Control (DTCA and DTCB Pins) Start-Up and Shutdown (RUN and 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 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 Pin Tied to Ground (Adaptive Dead Time Control) DTCx Pin connected with a resistor to GND Power FET Selection CIN and COUT Selection Single Output 2-Phase Operation Setting the Output Voltage RUNx Pins and Undervoltage Lockout Soft Start (SSx Pins) INTVCC Regulators (OPTI-DRIVE) Topside FET Driver Supply (CB) Minimum On-Time Considerations Fault Conditions: Overtemperature Protection Phase-Locked Loop and Frequency Synchronization Efficiency Considerations Checking Transient Response Design Example PCB Board Layout Checklist PCB Layout Debugging Typical Applications Related Parts Outline Dimensions Ordering Guide
(Specifications are at TJ = -40°C to +125°C for the minimum and maximum values, TA = 25°C for the typical values, VBIAS = 12V, RUN1 and RUN2 = 5V, VPRG1 = Float, EXTVCC = 0V, DRVSET = 0V, DRVUV = 0V, DTCA and DTCB = 0V, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS/COMMENTS MIN TYP MAX UNITS
DRVSET = INTVCC 5.2 5.5 5.7 V DRVSET = 0V 4.8 5.0 5.2 V DRVSET = 64.9kΩ 4.5 4.75 5.0 V DRV DRV CC load current = 0mA to 100mA, CC Load Regulation 1 3 % TA = 25°C DRVCC Rising DRVUV = INTVCC 4.8 5.0 5.2 V DRVUV = 0V 3.6 3.8 4.0 V DRVUV = floating 4.2 4.4 4.6 V Undervoltage Lockout UVLO DRVCC Falling DRVUV = INTVCC 4.55 4.75 4.95 V DRVUV = 0V 3.4 3.6 3.8 V DRVUV = floating 4.0 4.18 4.4 V EXTVCC LDO DRVUV = INTV 5.75 5.95 6.15 V Switchover Voltage CC or floating, TA = 25°C DRVUV = 0V, T 4.6 4.76 4.9 V EXTV A = 25°c CC Rising EXTVCC LDO DRVUV = INTV 390 mV Switchover Hysteresis CC or floating DRVUV = 0V 220 mV EXTVCC Falling
Spread Spectrum Oscillator and Phase-Locked Loop (PLL)
PLLIN/SPREAD = 0V FREQ = 0V, TA = 25°C 320 370 420 kHz FREQ = INTV Fixed Frequencies f CC 2.0 2.25 2.5 MHz OSC FREQ = 374kΩ 100 kHz FREQ = 75kΩ, TA = 25°C 450 500 550 kHz FREQ = 12.4kΩ 3 MHz Synchronizable f Frequency Range SYNC PLLIN/SPREAD = External Clock 0.1 3 MHz PLLIN Input 2.2 V High-Level PLLIN Input Low-Level 0.5 V Spread Spectrum PLLIN/SPREAD = INTVCC Frequency Range Minimum Frequency 0 % (Relative to fOSC) Maximum Frequency 20 %
analog.com
Rev. 0 7 of 50 Document Outline Features Applications General Description Typical Application Revision History Specifications Absolute Maximum Ratings Pin Configurations and Function Descriptions Typical Performance Characteristics Functional Diagram Theory of Operation Main Control Loop Power and Bias Supplies (VBIAS, EXTVCC, DRVCC, INTVCC) High Side Bootstrap Capacitor Dead Time Control (DTCA and DTCB Pins) Start-Up and Shutdown (RUN and 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 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 Pin Tied to Ground (Adaptive Dead Time Control) DTCx Pin connected with a resistor to GND Power FET Selection CIN and COUT Selection Single Output 2-Phase Operation Setting the Output Voltage RUNx Pins and Undervoltage Lockout Soft Start (SSx Pins) INTVCC Regulators (OPTI-DRIVE) Topside FET Driver Supply (CB) Minimum On-Time Considerations Fault Conditions: Overtemperature Protection Phase-Locked Loop and Frequency Synchronization Efficiency Considerations Checking Transient Response Design Example PCB Board Layout Checklist PCB Layout Debugging Typical Applications Related Parts Outline Dimensions Ordering Guide