Datasheet LTC7892 (Analog Devices) - 6
| 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 / 6 — Data Sheet. LTC7892. PARAMETER. SYMBOL. CONDITIONS/COMMENTS. MIN. TYP. … |
| 文件格式/大小 | PDF / 1.0 Mb |
| 文件语言 | 英语 |
Data Sheet. LTC7892. PARAMETER. SYMBOL. CONDITIONS/COMMENTS. MIN. TYP. MAX. UNITS. Gate Drivers. INTVCC Low Dropout (LDO) Linear Regulators
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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
Pulse-Skipping (PS) Mode or Forced One Channel On 2 mA Continuous Mode Both Channels On 3 mA (FCM), VBIAS or EXTVCC Current
2 Gate Drivers
DRVSET = INTV TGxxx or BGxxx On CC Pull-Up 1.0 Ω Resistance Pull-Down 1.0 Ω BOOSTx to DRVCC DRVSET = INTV Switch on Resistance CC 6 Ω TGxxx or BGxxx Rise Time 25 ns Transition Time
3
Fall Time 15 ns BGxxx Off to TGxxx on Adaptive Delay DTCA = 0V 15 ns Time
4
TGxxx Off to BGxxx on Adaptive Delay DTCB = 0V 15 ns Time
4
DTCA = 10kΩ 7 ns BGxxx Off to TGxxx DTCA = 50kΩ 25 ns on Open-Loop Delay
4
DTCA = 100kΩ 40 ns DTCB = 10kΩ 7 ns TGxxx Off to BGxxx DTCB = 50kΩ 25 ns on Open-Loop Delay
4
DTCB = 100kΩ 40 ns BGxxx Minimum t On-Time
5
ON(MIN) 100 ns Maximum Duty Factor V for BGxxx FREQ = 0V 93 %
INTVCC Low Dropout (LDO) Linear Regulators
INTVCC Voltage for VBIAS EXTV CC = 0V for VBIAS LDO, and EXTVCC LDOs EXTVCC = 12V for EXTVCC LDO
analog.com
Rev. 0 6 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 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
Pulse-Skipping (PS) Mode or Forced One Channel On 2 mA Continuous Mode Both Channels On 3 mA (FCM), VBIAS or EXTVCC Current
2 Gate Drivers
DRVSET = INTV TGxxx or BGxxx On CC Pull-Up 1.0 Ω Resistance Pull-Down 1.0 Ω BOOSTx to DRVCC DRVSET = INTV Switch on Resistance CC 6 Ω TGxxx or BGxxx Rise Time 25 ns Transition Time
3
Fall Time 15 ns BGxxx Off to TGxxx on Adaptive Delay DTCA = 0V 15 ns Time
4
TGxxx Off to BGxxx on Adaptive Delay DTCB = 0V 15 ns Time
4
DTCA = 10kΩ 7 ns BGxxx Off to TGxxx DTCA = 50kΩ 25 ns on Open-Loop Delay
4
DTCA = 100kΩ 40 ns DTCB = 10kΩ 7 ns TGxxx Off to BGxxx DTCB = 50kΩ 25 ns on Open-Loop Delay
4
DTCB = 100kΩ 40 ns BGxxx Minimum t On-Time
5
ON(MIN) 100 ns Maximum Duty Factor V for BGxxx FREQ = 0V 93 %
INTVCC Low Dropout (LDO) Linear Regulators
INTVCC Voltage for VBIAS EXTV CC = 0V for VBIAS LDO, and EXTVCC LDOs EXTVCC = 12V for EXTVCC LDO
analog.com
Rev. 0 6 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