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LTC3886 Datasheet(PDF) 2 Page - Linear Technology

Part # LTC3886
Description  60V Dual Output Step-Down Controller with Digital Power System Management
Download  116 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3886 Datasheet(HTML) 2 Page - Linear Technology

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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


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