LTC2978 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC2978' PDF : 64 Pages View PDF
LTC2978
Table of Contents
MFR_VINEN_OV_FAULT_RESPONSE.................. 47
MFR_VINEN_UV_FAULT_RESPONSE.................. 48
MFR_RETRY_DELAY........................................... 48
MFR_RESTART_DELAY....................................... 49
MFR_VOUT_PEAK............................................... 49
MFR_VIN_PEAK.................................................. 49
MFR_TEMPERATURE_PEAK............................... 49
MFR_DAC............................................................ 50
MFR_POWERGOOD_ASSERTION_DELAY.......... 50
Watchdog Operation................................................50
MFR_WATCHDOG_T_FIRST and MFR_
WATCHDOG_T..................................................... 50
MFR_PAGE_FF_MASK........................................ 51
MFR_PADS.......................................................... 52
MFR_I2C_BASE_ADDRESS................................ 52
MFR_SPECIAL_ID............................................... 52
MFR_SPECIAL_LOT............................................ 53
MFR_VOUT_DISCHARGE_THRESHOLD.............. 53
MFR_COMMON................................................... 53
MFR_SPARE0...................................................... 53
MFR_SPARE2...................................................... 53
MFR_VOUT_MIN................................................. 54
MFR_VIN_MIN.................................................... 54
MFR_TEMPERATURE_MIN................................. 54
Fault Log Operation.................................................54
MFR_FAULT_LOG_STORE.................................. 55
MFR_FAULT_LOG_RESTORE.............................. 55
MFR_FAULT_LOG_CLEAR................................... 55
MFR_FAULT_LOG_STATUS................................. 55
MFR_FAULT_LOG................................................ 56
Applications Information................................. 62
Overview.................................................................. 62
Powering the LTC2978.............................................62
Setting Command Register Values.......................... 62
Sequence, Servo, Margin and Restart Operations... 62
Command Units On or Off...................................62
On Sequencing....................................................63
On State Operation..............................................63
Servo Modes.......................................................63
DAC Modes..........................................................63
Margining............................................................ 64
Off Sequencing....................................................64
VOUT Off Threshold Voltage.................................64
Automatic Restart Via MFR_RESTART_DELAY
Command and CONTROLn pin............................64
Fault Management...................................................64
Output Overvoltage and Undervoltage Faults......64
Output Overvoltage and Undervoltage Warnings.65
Configuring the VIN_EN Output.............................65
Multichannel Fault Management ......................... 67
Interconnect Between Multiple LTC2978’s............... 67
Application Circuits..................................................69
Trimming and Margining DC/DC Converters with
External Feedback Resistors...............................69
Four-Step Resistor Selection Procedure for DC/DC
Converters with External Feedback Resistors.....69
Trimming and Margining DC/DC Converters with a
TRIM Pin............................................................. 70
Two-Step Resistor and DAC Full-Scale Voltage
Selection Procedure for DC/DC Converters with a
TRIM Pin............................................................. 70
Measuring Current............................................... 71
Measuring Current with a Sense Resistor........... 71
Measuring Current with Inductor DCR................. 71
Single Phase Design Example.............................72
Measuring Multiphase Currents..........................72
Multiphase Design Example................................72
Anti-aliasing Filter Considerations.......................73
Sensing Negative Voltages.................................. 73
Connecting the USB to I2C/SMBus/PMBus Controller
to the LTC2978 in System........................................ 74
LTpowerPlay: An Interactive GUI for Digital Power.. 76
PCB Assembly and Layout Suggestions..................77
Bypass Capacitor Placement...............................77
Exposed Pad Stencil Design................................77
PC Board Layout.................................................77
Unused ADC Sense Inputs...................................77
Package Description...................................... 78
Revision History........................................... 79
Typical Application........................................ 80
Related Parts............................................... 80
For more information www.linear.com/LTC2978
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