Datasheet LTC7893 (Analog Devices) - 6
| Hersteller | Analog Devices |
| Beschreibung | 100V Low IQ, Synchronous Boost Controller for GaN FETs in 28-Lead QFN (4mm x 5mm, Plastic Side Wettable) package |
| Seiten / Seite | 48 / 6 — Data Sheet. LTC7893. PARAMETER. SYMBOL. CONDITIONS/COMMENTS. MIN. TYP. … |
| Dateiformat / Größe | PDF / 1.5 Mb |
| Dokumentensprache | Englisch |
Data Sheet. LTC7893. PARAMETER. SYMBOL. CONDITIONS/COMMENTS. MIN. TYP. MAX. UNITS. INTVCC Low Dropout (LDO) Linear Regulators
Modelllinie für dieses Datenblatt
Textversion des Dokuments
link to page 7 link to page 7
Data Sheet LTC7893
(Specifications are at TJ = -40°C to +125°C for the minimum and maximum values, TA = 25°C for the typical values, VBIAS = 12V, RUN = 5V, VPRG = Floating, EXTVCC = 0V, DRVSET = 0V, DRVUV = 0V, DTCA and DTCB = 0V, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS/COMMENTS MIN TYP MAX UNITS
TGx Off to BGx On DTCB = 10kΩ 7 ns Open-Loop Delay
4
DTCB = 50kΩ 25 ns DTCB = 100kΩ 40 ns BGx Minimum On- t Time
5
ON(MIN) 100 ns Maximum Duty Factor V for BGx FREQ = 0V 93 %
INTVCC Low Dropout (LDO) Linear Regulators
EXTVCC = 0V for VBIAS LDO, EXTV INTV CC = 12V for EXTVCC LDO CC Voltage for VBIAS DRVSET = INTV 5.2 5.5 5.7 V and EXTV CC CC LDOs 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 Switchover Voltage 5.75 5.95 6.15 V CC or floating, TA = 25°C EXTV DRVUV = 0V, TA = 25°C 4.6 4.76 4.9 V CC Rising EXTVCC LDO DRVUV = INTV 390 mV Switchover Hysteresis CC or floating 220 mV EXTV DRVUV = 0V CC Falling
Spread Spectrum Oscillator and Phase-Locked Loop
PLLIN/SPREAD = 0V Fixed Frequencies f FREQ = 0V, T 320 370 420 kHz OSC A = 25°C FREQ = INTVCC 2.0 2.25 2.5 MHz FREQ = 374kΩ 100 kHz
analog.com
Rev. 0 6 of 48 Document Outline Features Applications General Description Typical Application TABLE OF CONTENTS 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, and INTVCC) High-Side Bootstrap Capacitor Dead Time Control (DTCA and DTCB Pins) Startup and Shutdown (RUN and SS 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) 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 Setting the Output Voltage RUN Pin and Undervoltage Lockout Soft-Start (SS Pin) 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
Data Sheet LTC7893
(Specifications are at TJ = -40°C to +125°C for the minimum and maximum values, TA = 25°C for the typical values, VBIAS = 12V, RUN = 5V, VPRG = Floating, EXTVCC = 0V, DRVSET = 0V, DRVUV = 0V, DTCA and DTCB = 0V, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS/COMMENTS MIN TYP MAX UNITS
TGx Off to BGx On DTCB = 10kΩ 7 ns Open-Loop Delay
4
DTCB = 50kΩ 25 ns DTCB = 100kΩ 40 ns BGx Minimum On- t Time
5
ON(MIN) 100 ns Maximum Duty Factor V for BGx FREQ = 0V 93 %
INTVCC Low Dropout (LDO) Linear Regulators
EXTVCC = 0V for VBIAS LDO, EXTV INTV CC = 12V for EXTVCC LDO CC Voltage for VBIAS DRVSET = INTV 5.2 5.5 5.7 V and EXTV CC CC LDOs 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 Switchover Voltage 5.75 5.95 6.15 V CC or floating, TA = 25°C EXTV DRVUV = 0V, TA = 25°C 4.6 4.76 4.9 V CC Rising EXTVCC LDO DRVUV = INTV 390 mV Switchover Hysteresis CC or floating 220 mV EXTV DRVUV = 0V CC Falling
Spread Spectrum Oscillator and Phase-Locked Loop
PLLIN/SPREAD = 0V Fixed Frequencies f FREQ = 0V, T 320 370 420 kHz OSC A = 25°C FREQ = INTVCC 2.0 2.25 2.5 MHz FREQ = 374kΩ 100 kHz
analog.com
Rev. 0 6 of 48 Document Outline Features Applications General Description Typical Application TABLE OF CONTENTS 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, and INTVCC) High-Side Bootstrap Capacitor Dead Time Control (DTCA and DTCB Pins) Startup and Shutdown (RUN and SS 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) 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 Setting the Output Voltage RUN Pin and Undervoltage Lockout Soft-Start (SS Pin) 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