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LTC3886 Datasheet(PDF) 2 Page - Linear Technology |
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LTC3886 Datasheet(HTML) 2 Page - Linear Technology |
2 / 116 page LTC3886 2 3886f For more information www.linear.com/LTC3886 Table oF conTenTs 3886 Features..................................................... 1 Applications ................................................ 1 Typical Application ........................................ 1 Description.................................................. 1 Table of Contents .......................................... 2 Absolute Maximum Ratings.............................. 4 Order Information.......................................... 4 Pin Configuration .......................................... 4 Electrical Characteristics................................. 5 Typical Performance Characteristics ..................10 Pin Functions ..............................................13 Block Diagram.............................................15 Operation...................................................16 Overview................................................................. 16 Main Control Loop.................................................. 16 EEPROM ................................................................. 17 Power-Up and Initialization ..................................... 17 Soft-Start................................................................ 18 Time-Based Sequencing ......................................... 18 Event-Based Sequencing ........................................ 19 Shutdown ............................................................... 19 Light-Load Current Operation ................................. 19 PWM Loop Compensation......................................20 Switching Frequency and Phase .............................20 Output Voltage Sensing ..........................................20 Output Current Sensing ..........................................20 Input Current Sensing.............................................21 PolyPhase Load Sharing.........................................21 External/Internal Temperature Sense......................21 RCONFIG (Resistor Configuration) Pins..................22 Fault Handling.........................................................23 Status Registers and ALERT Masking................. 24 Mapping Faults to FAULT Pins............................ 24 Power Good Pins................................................26 CRC Protection ..................................................26 Serial Interface .......................................................26 Communication Protection ................................26 Device Addressing..................................................26 Responses to VOUT and IOUT Faults ........................27 Output Overvoltage Fault Response ...................27 Output Undervoltage Response .........................27 Peak Output Overcurrent Fault Response...........27 Responses to Timing Faults....................................28 Responses to VIN OV Faults....................................28 Responses to OT/UT Faults.....................................28 Internal Overtemperature Fault/Warn Response 28 External Overtemperature and Undertemperature Fault Response ..................................................28 Responses to Input Overcurrent and Output Undercurrent Faults ................................................29 Responses to External Faults .................................29 Fault Logging..........................................................29 Bus Timeout Protection ..........................................29 Similarity Between PMBus, SMBus and I2C 2-Wire Interface......................................................30 PMBus Serial Digital Interface ................................30 PMBus Command Summary ............................35 PMBus Commands .................................................35 *Data Format ..........................................................40 Applications Information ................................41 Current Limit Programming.................................... 41 ISENSE+ and ISENSE– Pins.........................................41 Low Value Resistor Current Sensing.......................42 Inductor DCR Current Sensing................................43 Slope Compensation and Inductor Peak Current ....44 Inductor Value Calculation ......................................44 Inductor Core Selection ..........................................45 Power MOSFET and Optional Schottky Diode Selection.................................................................45 CIN and COUT Selection ...........................................46 Variable Delay Time, Soft-Start and Output Voltage Ramping .................................................................46 Digital Servo Mode .................................................47 Soft Off (Sequenced Off)........................................48 INTVCC Regulator....................................................48 Topside MOSFET Driver Supply (CB, DB) ................49 Fault Indications .....................................................50 |
Similar Part No. - LTC3886_15 |
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Similar Description - LTC3886_15 |
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