Datasheet LTC7899 (Analog Devices) - 6
| Hersteller | Analog Devices |
| Beschreibung | 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 |
| Seiten / Seite | 50 / 6 — Data Sheet. LTC7899. PARAMETER. SYMBOL. CONDITIONS/COMMENTS. MIN. TYP. … |
| Dateiformat / Größe | PDF / 1.2 Mb |
| Dokumentensprache | Englisch |
Data Sheet. LTC7899. PARAMETER. SYMBOL. CONDITIONS/COMMENTS. MIN. TYP. MAX. UNITS. Charge Pump for BST-SW Supply
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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
DTCA = 10k 13 ns BGxx Off to TGxx On DTCA = 50k 50 ns Open-Loop Delay
5
DTCA = 100k 100 ns DTCB = 10k 13 ns TGxx Off to BGxx On DTCB = 50k 50 ns Open-Loop Delay
5
DTCB = 100k 100 ns BG Minimum On- t Time
6
ON(MIN) 120 ns Maximum Duty Cycle FREQ = 0V 93 % for BGx
Charge Pump for BST-SW Supply
V Charge Pump Output BST-SW = 7V, V -120 µA Current SW = 0V VSW = 12V -80 µA Charge Pump Output V Voltage BST-SW IBST = −1µA, VSW = 0V and 12V 10 11 12 V
Low Dropout (LDO) Linear Regulators
EXTVCC = INTVCC for VBIAS LDO, EXTV DRV CC = 12V for EXTVCC LDO CC Voltage for VBIAS DRVSET = INTV 9.5 9.77 10.0 V and EXTV CC CC LDOs DRVSET = 64.9kΩ 5.8 6.5 7.0 V DRVSET = 0V 5.8 6.0 6.2 V DRV DRV CC load current = 0mA to 100mA, CC Load Regulation 1 3 % TA = 25°C DRVCC Rising DRVUV = INTVCC 7.1 7.4 7.6 V DRVUV = floating 5.2 5.35 5.5 V DRVUV = 0V 3.8 3.93 4.0 V Undervoltage Lockout UVLO DRVCC Falling DRVUV = INTVCC 6.4 6.64 6.8 V DRVUV = floating 4.9 5.05 5.2 V DRVUV = 0V 3.6 3.71 3.8 V
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Rev. 0 6 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
DTCA = 10k 13 ns BGxx Off to TGxx On DTCA = 50k 50 ns Open-Loop Delay
5
DTCA = 100k 100 ns DTCB = 10k 13 ns TGxx Off to BGxx On DTCB = 50k 50 ns Open-Loop Delay
5
DTCB = 100k 100 ns BG Minimum On- t Time
6
ON(MIN) 120 ns Maximum Duty Cycle FREQ = 0V 93 % for BGx
Charge Pump for BST-SW Supply
V Charge Pump Output BST-SW = 7V, V -120 µA Current SW = 0V VSW = 12V -80 µA Charge Pump Output V Voltage BST-SW IBST = −1µA, VSW = 0V and 12V 10 11 12 V
Low Dropout (LDO) Linear Regulators
EXTVCC = INTVCC for VBIAS LDO, EXTV DRV CC = 12V for EXTVCC LDO CC Voltage for VBIAS DRVSET = INTV 9.5 9.77 10.0 V and EXTV CC CC LDOs DRVSET = 64.9kΩ 5.8 6.5 7.0 V DRVSET = 0V 5.8 6.0 6.2 V DRV DRV CC load current = 0mA to 100mA, CC Load Regulation 1 3 % TA = 25°C DRVCC Rising DRVUV = INTVCC 7.1 7.4 7.6 V DRVUV = floating 5.2 5.35 5.5 V DRVUV = 0V 3.8 3.93 4.0 V Undervoltage Lockout UVLO DRVCC Falling DRVUV = INTVCC 6.4 6.64 6.8 V DRVUV = floating 4.9 5.05 5.2 V DRVUV = 0V 3.6 3.71 3.8 V
analog.com
Rev. 0 6 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