Datasheet LTC7892 (Analog Devices) - 4
| 制造商 | Analog Devices |
| 描述 | Low IQ, Dual, 2-Phase Synchronous Boost Controller for GaN FETs in 40-Lead QFN (6mm x 6mm, Plastic Side Wettable) package |
| 页数 / 页 | 50 / 4 — Data Sheet. LTC7892. SPECIFICATIONS Table 1. Electrical Characteristics. … |
| 文件格式/大小 | PDF / 1.0 Mb |
| 文件语言 | 英语 |
Data Sheet. LTC7892. SPECIFICATIONS Table 1. Electrical Characteristics. PARAMETER. SYMBOL. CONDITIONS/COMMENTS. MIN. TYP. MAX. UNITS
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Data Sheet LTC7892 SPECIFICATIONS Table 1. Electrical Characteristics
(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 Input Supply
Bias Input Supply VBIAS 4 100 V Operating Range Boost Converter Input Supply Operating VIN VBIAS ≥ 4V 1 60 V Range Output Voltage VOUT1,OUT2 1.2 100 V Operating Range
Controller Operation
VBIAS = 4V to 100V, ITH1 Voltage = 0.6V to 1.2V Channel 1 Regulated VPRG1 = floating, T 1.188 1.2 1.212 V V A = 25°C Feedback Voltage FB1 VPRG1 = floating 1.182 1.2 1.218 V VPRG1 = 0V 23.45 24 24.55 V VPRG1 = INTVCC 27.38 28 28.62 V V Channel 2 Regulated BIAS = 4V to 100V, V Feedback Voltage
1
FB2 ITH2 Voltage = 0.6V to 1.2V 1.188 1.2 1.212 V TA = 25°C 1.182 1.2 1.218 V Channel 1 Feedback VPRG1 = floating, T -50 0 +50 nA A = 25°C Current
1
VPRG1 = 0V or INTVCC 2 µA Channel 2 Feedback T Current
1
A = 25°C -50 0 +50 nA Feedback Overvoltage Relative to V Threshold FBx, TA = 25°C 7 10 13 % Transconductance ITH1 and ITH2 = 1.2V, g 1.8 mmho Amplifier
1
m1, gm2 Sink and Source = 5µA VFBx = 1.1V, SENSEx+ = 12V Maximum Current ILIM = 0V 21 25 31 mV V Sense Threshold SENSE(MAX) ILIM = floating 45 50 55 mV ILIM = INTVCC 67 75 83 mV
analog.com
Rev. 0 4 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
Data Sheet LTC7892 SPECIFICATIONS Table 1. Electrical Characteristics
(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 Input Supply
Bias Input Supply VBIAS 4 100 V Operating Range Boost Converter Input Supply Operating VIN VBIAS ≥ 4V 1 60 V Range Output Voltage VOUT1,OUT2 1.2 100 V Operating Range
Controller Operation
VBIAS = 4V to 100V, ITH1 Voltage = 0.6V to 1.2V Channel 1 Regulated VPRG1 = floating, T 1.188 1.2 1.212 V V A = 25°C Feedback Voltage FB1 VPRG1 = floating 1.182 1.2 1.218 V VPRG1 = 0V 23.45 24 24.55 V VPRG1 = INTVCC 27.38 28 28.62 V V Channel 2 Regulated BIAS = 4V to 100V, V Feedback Voltage
1
FB2 ITH2 Voltage = 0.6V to 1.2V 1.188 1.2 1.212 V TA = 25°C 1.182 1.2 1.218 V Channel 1 Feedback VPRG1 = floating, T -50 0 +50 nA A = 25°C Current
1
VPRG1 = 0V or INTVCC 2 µA Channel 2 Feedback T Current
1
A = 25°C -50 0 +50 nA Feedback Overvoltage Relative to V Threshold FBx, TA = 25°C 7 10 13 % Transconductance ITH1 and ITH2 = 1.2V, g 1.8 mmho Amplifier
1
m1, gm2 Sink and Source = 5µA VFBx = 1.1V, SENSEx+ = 12V Maximum Current ILIM = 0V 21 25 31 mV V Sense Threshold SENSE(MAX) ILIM = floating 45 50 55 mV ILIM = INTVCC 67 75 83 mV
analog.com
Rev. 0 4 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