Datasheet

LTC3880/LTC3880-1
3
3880fc
For more information www.linear.com/LTC3880
TABLE OF CONTENTS
RCONFIG (External Resistor
Configuration Pins)
................................................. 49
Voltage Selection ................................................49
Frequency and Phase Selection Using
RCONFIG ............................................................50
Address Selection Using RCONFIG ..................... 51
Efficiency Considerations .......................................52
Checking Transient Response ................................. 53
PC Board Layout Checklist .....................................54
PC Board Layout Debugging ...................................56
Design Example ...................................................... 57
Connecting the USB to the I
2
C/SMBus/PMBus
Controller to the LTC3880 In System ......................59
LTpowerPlay: An Interactive GUI for
Digital Power ..........................................................60
PMBus Communication and Command
Processing
..............................................................61
PMBus Command Details ............................... 63
Addressing and Write Protect ................................. 63
General Configuration Registers .............................65
On/Off/Margin ........................................................66
PWM Config ...........................................................68
Voltage ....................................................................70
Input Voltage and Limits .....................................70
Output Voltage and Limits .................................. 71
Current .................................................................... 74
Input Current Calibration ................................... 74
Output Current Calibration ................................. 74
Input Current ...................................................... 74
Output Current ....................................................75
Temperature ............................................................76
External Temperature Calibration........................76
External Temperature Limits ...............................77
Timing ....................................................................78
Timing—On Sequence/Ramp .............................78
Timing—Off Sequence/Ramp ............................79
Precondition for Restart .....................................79
Fault Response .......................................................80
Fault Responses All Faults ..................................80
Fault Responses Input Voltage ...........................80
Fault Responses Output Voltage ......................... 81
Fault Responses Output Current .........................84
Fault Responses IC Temperature ........................85
Fault Responses External Temperature ...............86
Fault Sharing ...........................................................87
Fault Sharing Propagation ..................................87
Fault Sharing Response ......................................89
Scratchpad .............................................................89
Identification ...........................................................90
Fault Warning and Status ........................................91
Telemetry ................................................................ 98
NVM Memory Commands .................................... 101
Store/Restore ................................................... 101
Fault Logging .................................................... 102
Block Memory Write/Read................................ 108
Typical Applications .................................... 109
Package Description ................................... 114
Revision History ........................................ 115
Typical Application ..................................... 116
Related Parts ............................................ 116