Datasheet LTC7899 (Analog Devices) - 5
| Fabricante | Analog Devices |
| Descripción | 140V, Low IQ, Negative to Positive Synchronous Boost Controller with 10V Gate Drive in 28-Lead QFN (4mm x 4mm x 0.75mm w/ EP) package |
| Páginas / Página | 50 / 5 — Data Sheet. LTC7899. PARAMETER. SYMBOL. CONDITIONS/COMMENTS. MIN. TYP. … |
| Formato / tamaño de archivo | PDF / 1.2 Mb |
| Idioma del documento | Inglés |
Data Sheet. LTC7899. PARAMETER. SYMBOL. CONDITIONS/COMMENTS. MIN. TYP. MAX. UNITS. DC Supply Current. Gate Drivers. analog.com
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Data Sheet LTC7899
(Specifications are for TJ = -40°C to +150°C for the minimum and maximum values, TA = 25°C for the typical values, all voltages are with respect to V - - IN unless otherwise noted. (GND to VIN ) = 12V, RUN = 5V, EXTVCC = INTVCC, DRVSET = 0V, DRVUV = 0V, TGUP = TGDN = TGxx, BGUP = BGDN = BGxx, and DTCA and DTCB = 0V, unless otherwise noted. )
PARAMETER SYMBOL CONDITIONS/COMMENTS MIN TYP MAX UNITS
Soft-Start Charge SS Current = 0V 7 9 11 µA RUN Pin ON Threshold RUN Rising 1.15 1.20 1.25 V RUN Pin Hysteresis 120 mV
DC Supply Current
VBIAS Shutdown RUN = 0V 1 Current μA VBIAS Sleep Mode SENSE+ Current < 3.2V, EXTVCC = INTVCC 15 μA Sleep Mode Current
3
VBIAS Current SENSE+ ≥ 3.2V, EXTVCC = INTVCC 5 μA VBIAS Current SENSE+ ≥ 3.2V, EXTVCC ≥ 12V 1 μA EXTVCC Current SENSE+ ≥ 3.2V, EXTVCC ≥ 12V 10 μA SENSE+ Current SENSE+ ≥ 3.2V 10 μA Pulse-Skipping or Forced Continuous 2.5 mA Mode (FCM), VBIAS or EXTVCC Current
3 Gate Drivers
DRVSET = INTV TGxx or BGxx CC Pull-up 2.0 On-Resistance Ω Pull-down 1.0 Ω TGxx or BGxx Transition Time
4
Rise Time CLOAD = 3300pF 25 ns Fall Time CLOAD = 3300pF 15 ns TGxx Off to BGxx On DTCA = 0V 80 ns Adaptive Delay Time
5
DTCA = INTVCC 30 ns BGxx Off to TGxx On DTCB = 0V 80 ns Adaptive Delay Time
5
DTCB = INTVCC 30 ns
analog.com
Rev. 0 5 of 50 Document Outline Features Applications General Description Typical Application TABLE OF CONTENTS Revision History Specifications Absolute Maximum Ratings Pin Configurations and Function Descriptions Block Diagram Typical Performance Characteristics 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) 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) PolyPhase Applications (CLKOUT and PHASMD Pins) Output Overvoltage Protection Operation at Low Input Voltage BOOST Supply Refresh 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 INTVCC or VIN- (Adaptive Dead Time Control) DTCx pin connected with a resistor to VIN-: Power MOSFET Selection CIN and COUT Selection Setting the Output Voltage RUN Pin and Undervoltage Lockout Soft-Start (SS Pin) DRVCC and INTVCC Regulators (OPTI-DRIVE) Topside MOSFET Driver Supply (CB, DB) Minimum On-Time Considerations Fault Conditions: Overtemperature Protection Phase-Locked Loop and Frequency Synchronization Efficiency Considerations Checking Transient Response Design Example PC Board Layout Checklist PC Board Layout Debugging Typical Application Related Parts Outline Dimensions Ordering Guide
Data Sheet LTC7899
(Specifications are for TJ = -40°C to +150°C for the minimum and maximum values, TA = 25°C for the typical values, all voltages are with respect to V - - IN unless otherwise noted. (GND to VIN ) = 12V, RUN = 5V, EXTVCC = INTVCC, DRVSET = 0V, DRVUV = 0V, TGUP = TGDN = TGxx, BGUP = BGDN = BGxx, and DTCA and DTCB = 0V, unless otherwise noted. )
PARAMETER SYMBOL CONDITIONS/COMMENTS MIN TYP MAX UNITS
Soft-Start Charge SS Current = 0V 7 9 11 µA RUN Pin ON Threshold RUN Rising 1.15 1.20 1.25 V RUN Pin Hysteresis 120 mV
DC Supply Current
VBIAS Shutdown RUN = 0V 1 Current μA VBIAS Sleep Mode SENSE+ Current < 3.2V, EXTVCC = INTVCC 15 μA Sleep Mode Current
3
VBIAS Current SENSE+ ≥ 3.2V, EXTVCC = INTVCC 5 μA VBIAS Current SENSE+ ≥ 3.2V, EXTVCC ≥ 12V 1 μA EXTVCC Current SENSE+ ≥ 3.2V, EXTVCC ≥ 12V 10 μA SENSE+ Current SENSE+ ≥ 3.2V 10 μA Pulse-Skipping or Forced Continuous 2.5 mA Mode (FCM), VBIAS or EXTVCC Current
3 Gate Drivers
DRVSET = INTV TGxx or BGxx CC Pull-up 2.0 On-Resistance Ω Pull-down 1.0 Ω TGxx or BGxx Transition Time
4
Rise Time CLOAD = 3300pF 25 ns Fall Time CLOAD = 3300pF 15 ns TGxx Off to BGxx On DTCA = 0V 80 ns Adaptive Delay Time
5
DTCA = INTVCC 30 ns BGxx Off to TGxx On DTCB = 0V 80 ns Adaptive Delay Time
5
DTCB = INTVCC 30 ns
analog.com
Rev. 0 5 of 50 Document Outline Features Applications General Description Typical Application TABLE OF CONTENTS Revision History Specifications Absolute Maximum Ratings Pin Configurations and Function Descriptions Block Diagram Typical Performance Characteristics 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) 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) PolyPhase Applications (CLKOUT and PHASMD Pins) Output Overvoltage Protection Operation at Low Input Voltage BOOST Supply Refresh 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 INTVCC or VIN- (Adaptive Dead Time Control) DTCx pin connected with a resistor to VIN-: Power MOSFET Selection CIN and COUT Selection Setting the Output Voltage RUN Pin and Undervoltage Lockout Soft-Start (SS Pin) DRVCC and INTVCC Regulators (OPTI-DRIVE) Topside MOSFET Driver Supply (CB, DB) Minimum On-Time Considerations Fault Conditions: Overtemperature Protection Phase-Locked Loop and Frequency Synchronization Efficiency Considerations Checking Transient Response Design Example PC Board Layout Checklist PC Board Layout Debugging Typical Application Related Parts Outline Dimensions Ordering Guide