LTC3883 Datasheet, PDF (3/112 Pages) Linear Technology – Single Phase Step-Down DC/DC Controller with Digital Power System Management

LTC3883/LTC3883-1
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 I²C/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 Registers..............................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
Fault Warning and Status.........................................92
Telemetry................................................................. 98
NVM Memory Commands..................................... 101
Store/Restore.................................................... 101
Fault Logging..................................................... 102
Block Memory Write/Read................................ 105
Typical Applications..................................... 107
Package Description.................................... 111
Typical Application...................................... 112
Related Parts............................................. 112
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