Datasheet LTC7892 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | Low IQ, Dual, 2-Phase Synchronous Boost Controller for GaN FETs in 40-Lead QFN (6mm x 6mm, Plastic Side Wettable) package |
| Pages / Page | 50 / 5 — Data Sheet. LTC7892. PARAMETER. SYMBOL. CONDITIONS/COMMENTS. MIN. TYP. … |
| File Format / Size | PDF / 1.0 Mb |
| Document Language | English |
Data Sheet. LTC7892. PARAMETER. SYMBOL. CONDITIONS/COMMENTS. MIN. TYP. MAX. UNITS. DC Supply Current. analog.com
Model Line for this Datasheet
Text Version of Document
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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
Current Sense V Threshold Matching FBx = 1.1V, SENSEx+ = 12V, -3.5 0 3.5 mV ILIM = floating, T between Channels A = 25°C SENSE1– and SENSE2– I – SENSE1 , SENSE1– and SENSE2– = 12V, -1 +1 µA Pin Current I – SENSE2 TA = 25°C SENSE1+ < 3V 1 µA SENSE1+ Pin Current I + SENSE1 3.3V ≤ SENSE1+ < INTVCC – 0.5V 75 µA SENSE1+ > INTVCC + 0.5V 725 µA SENSE2+ < INTV -2 +2 µA SENSE2+ Pin Current I + CC – 0.5V, TA = 25°C SENSE2 SENSE2+ > INTVCC + 0.5V 650 µA Soft-Start Charge SS1 and SS2 = 0V 9.5 12 14.5 µA Current RUN Pin ON RUNx rising 1.15 1.20 1.25 V Threshold RUN Pin 120 mV Hysteresis
DC Supply Current
VBIAS Shutdown RUN1 and RUN2 = 0V 1 µA Current SENSE1+ < 3.2V, EXTV V CC = 0V BIAS Sleep Mode One Channel On 15 µA Current Both Channels On 19 µA Sleep Mode Current
2
, Only Channel 1 On VBIAS Current SENSE1+ ≥ 3.2V, EXTV 5 µA CC = 0V VBIAS Current SENSE1+ ≥ 3.2V, EXTVCC ≥ 4.8V 1 µA EXTVCC Current SENSE1+ ≥ 3.2V, EXTVCC ≥ 4.8V 6 µA SENSE1+ Current SENSE1+ ≥ 3.2V 10 µA Sleep Mode Current
2
SENSE1+ ≥ 3.2V, EXTVCC ≥ 4.8V Both Channels On VBIAS Current 1 µA EXTVCC Current 7 µA SENSE1+ Current 12 µA
analog.com
Rev. 0 5 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
Current Sense V Threshold Matching FBx = 1.1V, SENSEx+ = 12V, -3.5 0 3.5 mV ILIM = floating, T between Channels A = 25°C SENSE1– and SENSE2– I – SENSE1 , SENSE1– and SENSE2– = 12V, -1 +1 µA Pin Current I – SENSE2 TA = 25°C SENSE1+ < 3V 1 µA SENSE1+ Pin Current I + SENSE1 3.3V ≤ SENSE1+ < INTVCC – 0.5V 75 µA SENSE1+ > INTVCC + 0.5V 725 µA SENSE2+ < INTV -2 +2 µA SENSE2+ Pin Current I + CC – 0.5V, TA = 25°C SENSE2 SENSE2+ > INTVCC + 0.5V 650 µA Soft-Start Charge SS1 and SS2 = 0V 9.5 12 14.5 µA Current RUN Pin ON RUNx rising 1.15 1.20 1.25 V Threshold RUN Pin 120 mV Hysteresis
DC Supply Current
VBIAS Shutdown RUN1 and RUN2 = 0V 1 µA Current SENSE1+ < 3.2V, EXTV V CC = 0V BIAS Sleep Mode One Channel On 15 µA Current Both Channels On 19 µA Sleep Mode Current
2
, Only Channel 1 On VBIAS Current SENSE1+ ≥ 3.2V, EXTV 5 µA CC = 0V VBIAS Current SENSE1+ ≥ 3.2V, EXTVCC ≥ 4.8V 1 µA EXTVCC Current SENSE1+ ≥ 3.2V, EXTVCC ≥ 4.8V 6 µA SENSE1+ Current SENSE1+ ≥ 3.2V 10 µA Sleep Mode Current
2
SENSE1+ ≥ 3.2V, EXTVCC ≥ 4.8V Both Channels On VBIAS Current 1 µA EXTVCC Current 7 µA SENSE1+ Current 12 µA
analog.com
Rev. 0 5 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