LTC2978AI View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
LTC2978AI
Linear Technology
'LTC2978AI' PDF : 80 Pages View PDF
LTC2978A
Table of Contents
MFR_VINEN_OV_FAULT_RESPONSE.................. 48
MFR_VINEN_UV_FAULT_RESPONSE.................. 49
MFR_RETRY_DELAY........................................... 49
MFR_RESTART_DELAY....................................... 50
MFR_VOUT_PEAK............................................... 50
MFR_VIN_PEAK.................................................. 50
MFR_TEMPERATURE_PEAK............................... 50
MFR_DAC............................................................ 51
MFR_POWERGOOD_ASSERTION_DELAY.......... 51
Watchdog Operation................................................ 51
MFR_WATCHDOG_T_FIRST and MFR_
WATCHDOG_T..................................................... 51
MFR_PAGE_FF_MASK........................................ 52
MFR_PADS.......................................................... 53
MFR_I2C_BASE_ADDRESS................................ 53
MFR_SPECIAL_ID............................................... 53
MFR_SPECIAL_LOT............................................ 54
MFR_VOUT_DISCHARGE_THRESHOLD.............. 54
MFR_COMMON................................................... 54
MFR_SPARE_0, MFR_SPARE_1, MFR_SPARE_2,
MFR_SPARE_3................................................... 54
MFR_VOUT_MIN................................................. 55
MFR_VIN_MIN.................................................... 55
MFR_TEMPERATURE_MIN................................. 55
Fault Log Operation.................................................55
MFR_FAULT_LOG_STORE.................................. 56
MFR_FAULT_LOG_RESTORE.............................. 56
MFR_FAULT_LOG_CLEAR................................... 56
MFR_FAULT_LOG_STATUS................................. 56
MFR_FAULT_LOG................................................ 57
Applications Information................................. 63
Overview.................................................................. 63
Powering the LTC2978A..........................................63
Setting Command Register Values..........................63
Sequence, Servo, Margin and Restart Operations...63
Command Units On or Off...................................63
On Sequencing....................................................64
On State Operation..............................................64
Servo Modes.......................................................64
DAC Modes..........................................................64
Margining............................................................ 65
Off Sequencing....................................................65
VOUT Off Threshold Voltage.................................65
Automatic Restart Via MFR_RESTART_DELAY
Command and CONTROLn pin............................65
Fault Management...................................................65
Output Overvoltage and Undervoltage Faults......65
Output Overvoltage and Undervoltage Warnings.66
Configuring the VIN_EN Output.............................66
Multichannel Fault Management .........................68
Interconnect Between Multiple LTC2978A’s.............68
Application Circuits.................................................. 70
Trimming and Margining DC/DC Converters with
External Feedback Resistors............................... 70
Four-Step Resistor Selection Procedure for DC/DC
Converters with External Feedback Resistors..... 70
Trimming and Margining DC/DC Converters with a
TRIM Pin............................................................. 71
Two-Step Resistor and DAC Full-Scale Voltage
Selection Procedure for DC/DC Converters with a
TRIM Pin............................................................. 71
Measuring Current............................................... 72
Measuring Current with a Sense Resistor...........72
Measuring Current with Inductor DCR................. 72
Single Phase Design Example.............................73
Measuring Multiphase Currents..........................73
Multiphase Design Example................................73
Anti-aliasing Filter Considerations....................... 74
Sensing Negative Voltages.................................. 74
Connecting the DC1613 USB to I2C/SMBus/PMBus
Controller to the LTC2978A in System..................... 75
LTpowerPlay: An Interactive GUI for Power System
Managers................................................................. 77
PCB Assembly and Layout Suggestions.................. 78
Bypass Capacitor Placement............................... 78
Exposed Pad Stencil Design................................ 78
PC Board Layout................................................. 78
Unused ADC Sense Inputs................................... 78
Package Description...................................... 79
Typical Application........................................ 80
Related Parts............................................... 80
For more information www.linear.com/LTC2978A
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