Table Of Contents - Linear Technology Analog Devices LT8708-1 Datasheet

LT8708-1

TABLE OF CONTENTS

Features ..................................................... 1
Applications ................................................ 1
Typical Application ........................................ 1
Description.................................................. 1
Absolute Maximum Ratings .............................. 3
Order Information .......................................... 3
Pin Configuration .......................................... 3
Electrical Characteristics ................................. 4
Typical Performance Characteristics ................... 8
Pin Functions .............................................. 10
Block Diagram ............................................. 13
Operation................................................... 14
Common LT8708-1 and LT8708 Features ............... 14
Adding Phases to an LT8708 Application ................ 14
Adding Phases: The Master LT8708 .................... 14
Adding Phases: The Slave LT8708-1 .................... 16
Start-Up .................................................................. 17
Start-Up: SWEN Pin .............................................. 17
Start-Up: Soft-Start of Switching Regulator ......... 18
Control Overview .................................................... 18
Power Switch Control ............................................ 19
Unidirectional and Bidirectional Conduction ........... 19
Error Amplifiers ...................................................... 19
Transfer Function: I
OUT(SLAVE)
Transfer Function: CCM ........................................ 21
Transfer Function: DCM, HCM and Burst Mode
Operation ............................................................ 21
2
Vs I ......20
OUT(MASTER)
For more information
Current Monitoring and Limiting ............................. 21
Monitoring: I
OUT(SLAVE)
Monitoring and Limiting: I
Multiphase Clocking ...............................................22
Applications Information ................................ 23
Quick-Start Multiphase Setup .................................23
Quick Setup: Design the Master Phase .................23
Quick Setup: Design the Slave Phase(s) ...............23
Quick Setup: Evaluation ........................................23
Choosing the Total Number of Phases ....................23
Operating Frequency Selection ............................... 24
C and C Selection ........................................... 24
IN OUT
C and C Selection: V
IN OUT
C and C Selection: V
IN OUT
VINHIMON, VOUTLOMON and RVSOFF ..................25
Configuring the I
IN(SLAVE)
Regulating I
OUT(SLAVE)
I : Circuit Description .............................26
OUT(SLAVE)
I : Configuration .................................... 28
OUT(SLAVE)
Loop Compensation ................................................ 28
Voltage Lockouts ....................................................29
Circuit Board Layout Checklist ...............................29
Design Example .....................................................29
Typical Applications ...................................... 31
Package Description ..................................... 35
Typical Application ....................................... 36
Related Parts .............................................. 36
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......................................... 21
...................... 21
IN(SLAVE)
Capacitance .............. 24
IN
Capacitance ...........25
OUT
Current Limits ................26
............................................26
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