Datasheet LTC7897 (Analog Devices) - 4
| 制造商 | Analog Devices |
| 描述 | 140V, Low IQ, Synchronous Buck Controller with Programmable 5V to 10V Gate Drive in 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) package |
| 页数 / 页 | 53 / 4 — Data Sheet. LTC7897. SPECIFICATIONS Table 1. Electrical Characteristics. … |
| 文件格式/大小 | PDF / 1.6 Mb |
| 文件语言 | 英语 |
Data Sheet. LTC7897. SPECIFICATIONS Table 1. Electrical Characteristics. PARAMETER. SYMBOL. CONDITIONS/COMMENTS. MIN. TYP. MAX. UNITS
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Data Sheet LTC7897 SPECIFICATIONS Table 1. Electrical Characteristics
(Specifications are for TJ = -40°C to +150°C for the minimum and maximum values, TA = 25°C for the typical values, VIN = 12V, RUN = 12V, VPRG = floating, EXTVCC = 0V, 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 Input Supply (VIN)
Input Supply V Operating Range IN 4 135 V Input Supply Current 48V to 5V, no load
1
5 I μA in Regulation VIN 14V to 3.3V, no load
1
9 μA
Controller Operation
Regulated Output V Voltage Set Point OUT 0.8 135 V VIN = 4V to 135V, ITH Voltage = 0.6V to 1.2V Regulated Feedback VPRG = floating, T 0.792 0.8 0.808 V V A = 25°C Voltage
2
FB VPRG = floating 0.788 0.8 0.812 V VPRG = 0V 4.890 5.0 5.110 V VPRG = INTVCC 11.73 12 12.27 V VPRG = floating, T -50 0 +50 nA Feedback Current
2
A = 25°C VPRG = 0V or INTVCC, TA = 25°C 1 2 µA Feedback Overvoltage Relative to V Threshold FB, TA = 25°C 7 10 13 % Transconductance g Amplifier g
2
m ITH = 1.2V, Sink and Source = 5μA 1.8 mMho m VFB = 0.7V, SENSE− = 3.3V Maximum Current ILIM = 0V 21 25 29 mV V Sense Threshold SENSE(MAX) ILIM = floating 45 50 55 mV ILIM = INTVCC 67 75 83 mV SENSE+ Pin Current ISENSE+ SENSE+ = 3.3V, TA = 25°C -1 +1 μA SENSE− < 3V 1 μA SENSE− Pin Current ISENSE− 3.2V ≤ SENSE− < INTVCC – 0.5V 60 μA SENSE− > INTVCC + 0.5V 700 μA
analog.com
Rev. A 4 of 53 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 (VIN, EXTVCC, DRVCC, and INTVCC) High-Side Bootstrap Capacitor Dead Time Control (DTCA and DTCB Pins) Start-Up and Shutdown (RUN, OVLO, and TRACK/SS Pins) Light Load Operation: Burst Mode Operation, Pulse-Skipping Mode, or Forced Continuous Mode (MODE Pin) Frequency Selection, Spread Spectrum, and PhaseLocked Loop (FREQ and PLLIN/SPREAD Pins) Input Supply Overvoltage Lockout (OVLO Pin) Output Overvoltage Protection Foldback Current 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 Ground (Adaptive Dead Time Control) DTCX Pin Connected with a Resistor to GND Power MOSFET Selection CIN and COUT Selection Setting the Output Voltage RUN Pin and Overvoltage/Undervoltage Lockout Soft-Start and Tracking (TRACK/SS Pin) DRVCC and INTVCC Regulators (OPTI-DRIVE) Topside MOSFET Driver Supply (CB, DB) Minimum On-Time Considerations Fault Conditions: Current Limit and Foldback Fault Conditions: Overvoltage Protection 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 LTC7897 SPECIFICATIONS Table 1. Electrical Characteristics
(Specifications are for TJ = -40°C to +150°C for the minimum and maximum values, TA = 25°C for the typical values, VIN = 12V, RUN = 12V, VPRG = floating, EXTVCC = 0V, 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 Input Supply (VIN)
Input Supply V Operating Range IN 4 135 V Input Supply Current 48V to 5V, no load
1
5 I μA in Regulation VIN 14V to 3.3V, no load
1
9 μA
Controller Operation
Regulated Output V Voltage Set Point OUT 0.8 135 V VIN = 4V to 135V, ITH Voltage = 0.6V to 1.2V Regulated Feedback VPRG = floating, T 0.792 0.8 0.808 V V A = 25°C Voltage
2
FB VPRG = floating 0.788 0.8 0.812 V VPRG = 0V 4.890 5.0 5.110 V VPRG = INTVCC 11.73 12 12.27 V VPRG = floating, T -50 0 +50 nA Feedback Current
2
A = 25°C VPRG = 0V or INTVCC, TA = 25°C 1 2 µA Feedback Overvoltage Relative to V Threshold FB, TA = 25°C 7 10 13 % Transconductance g Amplifier g
2
m ITH = 1.2V, Sink and Source = 5μA 1.8 mMho m VFB = 0.7V, SENSE− = 3.3V Maximum Current ILIM = 0V 21 25 29 mV V Sense Threshold SENSE(MAX) ILIM = floating 45 50 55 mV ILIM = INTVCC 67 75 83 mV SENSE+ Pin Current ISENSE+ SENSE+ = 3.3V, TA = 25°C -1 +1 μA SENSE− < 3V 1 μA SENSE− Pin Current ISENSE− 3.2V ≤ SENSE− < INTVCC – 0.5V 60 μA SENSE− > INTVCC + 0.5V 700 μA
analog.com
Rev. A 4 of 53 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 (VIN, EXTVCC, DRVCC, and INTVCC) High-Side Bootstrap Capacitor Dead Time Control (DTCA and DTCB Pins) Start-Up and Shutdown (RUN, OVLO, and TRACK/SS Pins) Light Load Operation: Burst Mode Operation, Pulse-Skipping Mode, or Forced Continuous Mode (MODE Pin) Frequency Selection, Spread Spectrum, and PhaseLocked Loop (FREQ and PLLIN/SPREAD Pins) Input Supply Overvoltage Lockout (OVLO Pin) Output Overvoltage Protection Foldback Current 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 Ground (Adaptive Dead Time Control) DTCX Pin Connected with a Resistor to GND Power MOSFET Selection CIN and COUT Selection Setting the Output Voltage RUN Pin and Overvoltage/Undervoltage Lockout Soft-Start and Tracking (TRACK/SS Pin) DRVCC and INTVCC Regulators (OPTI-DRIVE) Topside MOSFET Driver Supply (CB, DB) Minimum On-Time Considerations Fault Conditions: Current Limit and Foldback Fault Conditions: Overvoltage Protection 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