Datasheet LTC7890 (Analog Devices) - 3
| Fabricante | Analog Devices |
| Descripción | Low IQ, Dual, 2-Phase Synchronous Step-Down Controller for GaN FETs in 40-Lead QFN (6mm x 6mm, Plastic Side Wettable) package |
| Páginas / Página | 41 / 3 — LTC7890. SPECIFICATIONS. ELECTRICAL CHARACTERISTICS. Table 1. Electrical … |
| Formato / tamaño de archivo | PDF / 1.9 Mb |
| Idioma del documento | Inglés |
LTC7890. SPECIFICATIONS. ELECTRICAL CHARACTERISTICS. Table 1. Electrical Characteristics. Parameter. Symbol
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LTC7890 SPECIFICATIONS ELECTRICAL CHARACTERISTICS
TJ = −40°C to +150°C for the minimum and maximum values, TA = 25°C for the typical values, VIN = 12 V, RUN1 and RUN2 = 12 V, VPRG1 = floating, EXTVCC = 0 V, DRVSET = 0 V, DRVUV = 0 V, TGUP1 = TGDN1 = TGxx1, BGUP1 = BGDN1 = BGxx1, TGUP2 = TGDN2 = TGxx2, BGUP2 = BGDN2 = BGxx2, and DTCA and DTCB = 0 V, unless otherwise noted.
Table 1. Electrical Characteristics Parameter Symbol Test Conditions/Comments Min Typ Max Unit
INPUT SUPPLY Input Supply Operating Range VIN 4 100 V Total Quiescent Supply Current in Regulation IQ 48 V to 5 V, no load, RUN2 = 0 V1 5 μA 14 V to 3.3 V, no load, RUN2 = 0 V1 14 μA CONTROLLER OPERATION Regulated Output Voltage Set Point VOUT1, VOUT2 0.8 60 V Channel 1 Regulated Feedback Voltage2 VFB1 VIN = 4 V to 100 V, ITH1 voltage = 0.6 V to 1.2 V VPRG1 = floating, TA = 25°C 0.792 0.8 0.808 V VPRG1 = floating 0.788 0.8 0.812 V VPRG1 = 0 V 4.925 5.0 5.075 V VPRG1 = INTVCC 11.82 12 12.18 V Channel 2 Regulated Feedback Voltage2 VFB2 VIN = 4 V to 100 V, ITH2 voltage = 0.6 V to 1.2 V TA = 25°C 0.792 0.8 0.808 V 0.788 0.8 0.812 V Channel 1 Feedback Current2 VPRG1 = floating, TA = 25°C –50 0 +50 nA VPRG1 = 0 V or INTVCC, TA = 25°C 1 2 µA Channel 2 Feedback Current2 TA = 25°C –50 0 +50 nA Feedback Overvoltage Threshold (Relative to VFBx) TA = 25°C 7 10 13 % Transconductance Amplifier2 gM1, gM2 ITH1 and ITH2 = 1.2 V, sink and source current = 5 μA 1.8 mMho Maximum Current Sense Threshold VSENSE(MAX) VFBx = 0.7 V, SENSEx− = 3.3 V ILIM = 0 V 21 26 31 mV ILIM = floating 45 50 55 mV ILIM = INTVCC 67 75 83 mV SENSE1+ and SENSE2+ Pin Current ISENSE1+, SENSE1+ and SENSE2+ = 3.3 V, TA = 25°C −1 +1 μA ISENSE2+ SENSE1– Pin Current ISENSE1– SENSE1– < 3 V 1 μA 3.2 V ≤ SENSE1– < INTVCC – 0.5 V 75 μA SENSE1– > INTVCC + 0.5 V 725 μA SENSE2– Pin Current SENSE2– < INTVCC – 0.5 V –2 +2 μA SENSE2– > INTVCC + 0.5 V 650 μA Soft Start Charge Current TRACK/SS1 and TRACK/SS2 = 0 V 9.5 12 14.5 μA RUNx Pin On Threshold RUNx rising 1.15 1.20 1.25 V RUNx Pin Hysteresis 120 mV DC SUPPLY CURRENT VIN Shutdown Current RUN1 and RUN2 = 0 V 1 μA VIN Sleep Mode Current SENSE1− < 3.2 V, EXTVCC = 0 V One Channel On 15 µA Both Channels On 19 µA Sleep Mode Current3, Only Channel 1 On SENSE1– ≥ 3.2 V VIN Current EXTVCC = 0 V 5 µA VIN Current EXTVCC ≥ 4.8 V 1 µA EXTVCC Current EXTVCC ≥ 4.8 V 6 µA SENSE1– Current 10 µA
analog.com Rev. 0 | 3 of 41
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 (RUNx and TRACK/SSx 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 RUNx Pins and Undervoltage Lockout Soft Start and Tracking (TRACK/SSx Pin) 2-Phase Single Output Operation 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
LTC7890 SPECIFICATIONS ELECTRICAL CHARACTERISTICS
TJ = −40°C to +150°C for the minimum and maximum values, TA = 25°C for the typical values, VIN = 12 V, RUN1 and RUN2 = 12 V, VPRG1 = floating, EXTVCC = 0 V, DRVSET = 0 V, DRVUV = 0 V, TGUP1 = TGDN1 = TGxx1, BGUP1 = BGDN1 = BGxx1, TGUP2 = TGDN2 = TGxx2, BGUP2 = BGDN2 = BGxx2, and DTCA and DTCB = 0 V, unless otherwise noted.
Table 1. Electrical Characteristics Parameter Symbol Test Conditions/Comments Min Typ Max Unit
INPUT SUPPLY Input Supply Operating Range VIN 4 100 V Total Quiescent Supply Current in Regulation IQ 48 V to 5 V, no load, RUN2 = 0 V1 5 μA 14 V to 3.3 V, no load, RUN2 = 0 V1 14 μA CONTROLLER OPERATION Regulated Output Voltage Set Point VOUT1, VOUT2 0.8 60 V Channel 1 Regulated Feedback Voltage2 VFB1 VIN = 4 V to 100 V, ITH1 voltage = 0.6 V to 1.2 V VPRG1 = floating, TA = 25°C 0.792 0.8 0.808 V VPRG1 = floating 0.788 0.8 0.812 V VPRG1 = 0 V 4.925 5.0 5.075 V VPRG1 = INTVCC 11.82 12 12.18 V Channel 2 Regulated Feedback Voltage2 VFB2 VIN = 4 V to 100 V, ITH2 voltage = 0.6 V to 1.2 V TA = 25°C 0.792 0.8 0.808 V 0.788 0.8 0.812 V Channel 1 Feedback Current2 VPRG1 = floating, TA = 25°C –50 0 +50 nA VPRG1 = 0 V or INTVCC, TA = 25°C 1 2 µA Channel 2 Feedback Current2 TA = 25°C –50 0 +50 nA Feedback Overvoltage Threshold (Relative to VFBx) TA = 25°C 7 10 13 % Transconductance Amplifier2 gM1, gM2 ITH1 and ITH2 = 1.2 V, sink and source current = 5 μA 1.8 mMho Maximum Current Sense Threshold VSENSE(MAX) VFBx = 0.7 V, SENSEx− = 3.3 V ILIM = 0 V 21 26 31 mV ILIM = floating 45 50 55 mV ILIM = INTVCC 67 75 83 mV SENSE1+ and SENSE2+ Pin Current ISENSE1+, SENSE1+ and SENSE2+ = 3.3 V, TA = 25°C −1 +1 μA ISENSE2+ SENSE1– Pin Current ISENSE1– SENSE1– < 3 V 1 μA 3.2 V ≤ SENSE1– < INTVCC – 0.5 V 75 μA SENSE1– > INTVCC + 0.5 V 725 μA SENSE2– Pin Current SENSE2– < INTVCC – 0.5 V –2 +2 μA SENSE2– > INTVCC + 0.5 V 650 μA Soft Start Charge Current TRACK/SS1 and TRACK/SS2 = 0 V 9.5 12 14.5 μA RUNx Pin On Threshold RUNx rising 1.15 1.20 1.25 V RUNx Pin Hysteresis 120 mV DC SUPPLY CURRENT VIN Shutdown Current RUN1 and RUN2 = 0 V 1 μA VIN Sleep Mode Current SENSE1− < 3.2 V, EXTVCC = 0 V One Channel On 15 µA Both Channels On 19 µA Sleep Mode Current3, Only Channel 1 On SENSE1– ≥ 3.2 V VIN Current EXTVCC = 0 V 5 µA VIN Current EXTVCC ≥ 4.8 V 1 µA EXTVCC Current EXTVCC ≥ 4.8 V 6 µA SENSE1– Current 10 µA
analog.com Rev. 0 | 3 of 41
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 (RUNx and TRACK/SSx 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 RUNx Pins and Undervoltage Lockout Soft Start and Tracking (TRACK/SSx Pin) 2-Phase Single Output Operation 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