Datasheet

LTC3883/LTC3883-1
3
3883fa
For more information www.linear.com/LTC3883
TABLE OF CONTENTS
Topside MOSFET Driver Supply (C
B
, D
B
) ................45
Undervoltage Lockout .............................................45
C
IN
and C
OUT
Selection ...........................................45
Fault Conditions ...................................................... 46
Open-Drain Pins .....................................................47
Phase-Locked Loop and Frequency
Synchronization ...................................................... 47
Minimum On-Time Considerations..........................48
Input Current Sense Amplifier .................................48
RCONFIG (External Resistor
Configuration Pins)
................................................. 49
Voltage Selection ................................................49
Frequency and Phase Selection Using
RCONFIG ............................................................ 51
Address Selection Using RCONFIG ..................... 51
Efficiency Considerations ....................................... 52
Checking Transient Response .................................52
PolyPhase Configuration ....................................53
PC Board Layout Checklist .....................................54
PC Board Layout Debugging ...................................56
Design Example ...................................................... 56
Connecting the USB to I
2
C/SMBus/PMBus
Controller to the LTC3883 In System ......................58
Inductor DCR Auto Calibration ...............................59
Accurate DCR Temperature Compensation .............60
LTpowerPlay: An Interactive GUI for
Digital Power ..........................................................61
PMBus Communication and Command
Processing ..............................................................61
PMBus Command Details ............................... 64
Addressing and Write Protect ................................. 64
General Configuration COMMANDS ........................65
On/Off/Margin ........................................................66
PWM Configuration ................................................68
Voltage .................................................................... 70
Input Voltage and Limits .....................................70
Output Voltage and Limits .................................. 71
Current .................................................................... 74
Output Current Calibration ................................. 74
Output Current ....................................................76
Input Current Calibration ...................................77
Input Current ......................................................78
Temperature ............................................................78
External Temperature Calibration........................78
External Temperature Limits ............................... 79
Timing ....................................................................80
Timing—On Sequence/Ramp .............................80
Timing—Off Sequence/Ramp ............................81
Precondition for Restart ..................................... 81
Fault Response .......................................................82
Fault Responses All Faults ..................................82
Fault Responses Input Voltage ...........................82
Fault Responses Output Voltage .........................83
Fault Responses Output Current .........................85
Fault Responses IC Temperature ........................86
Fault Responses External Temperature ...............87
Fault Sharing ...........................................................88
Fault Sharing Propagation ..................................88
Fault Sharing Response ...................................... 90
Scratchpad .............................................................90
Identification ...........................................................91
Telemetry ................................................................ 96
NVM Memory Commands .................................... 100
Store/Restore ................................................... 100
Fault Logging .................................................... 101
Block Memory Write/Read................................ 105
Typical Applications .................................... 106
Package Description ................................... 110
Revision History ........................................ 111
Typical Application ..................................... 112
Related Parts ............................................ 112