LTC2977 datasheet(108/138 Pages) AD

108 / 138 page

LTM4664A

108

Rev. 0

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TOFF_MAX_WARN_LIMIT

The TOFF_MAX_WARN_LIMIT command sets the value, in milliseconds, on how long the output voltage exceeds

12.5% of the programmed voltage before a warning is asserted. The output is considered off when the VOUT voltage

is less than 12.5% of the programmed VOUT_COMMAND value. The calculation begins after TOFF_FALL is complete.

A data value of 0ms means that there is no limit and that the output voltage exceeds 12.5% of the programmed voltage

indefinitely. Other than 0, values from 120ms to 524 seconds are valid.

This command has two data bytes and is formatted in Linear_5s_11s format.

Precondition for Restart

COMMAND NAME

CMD CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT

UNITS

NVM

DEFAULT

VALUE

MFR_RESTART_ DELAY

0xDC

Minimum time the RUN pin is held

low by the LTM4664A.

R/W Word

L11

150

0xF258

MFR_RESTART_DELAY

This command specifies the minimum RUN off time in milliseconds. This device will pull the RUN pin low for this length

of time once a falling edge of RUN has been detected. The minimum recommended value is 136ms.

Note: The restart delay is different than the retry delay. The restart delay pulls RUN low for the specified time, after

which a standard start-up sequence is initiated. The minimum restart delay should be equal to TOFF_DELAY + TOFF_

FALL + 136ms. Valid values are from 136ms to 65.52 seconds in 16ms increments. To assure a minimum off time,

set the MFR_RESTART_DELAY 16ms longer than the desired time. The output rail can be off longer than the MFR_

RESTART_DELAY after the RUN pin is pulled high if the output decay bit 0 is enabled in MFR_CHAN_CONFIG and the

output takes a long time to decay below 12.5% of the programmed value.

This command has two data bytes and is formatted in Linear_5s_11s format.

FAULT RESPONSE

Fault Responses All Faults

COMMAND NAME

CMD CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT

UNITS

NVM

DEFAULT

VALUE

MFR_RETRY_ DELAY

0xDB

Retry interval during FAULT retry

mode.

R/W Word

L11

250

0xF3E8

MFR_RETRY_DELAY

This command sets the time in milliseconds between retries if the fault response is to retry the controller at specified

intervals. This command value is used for all fault responses that require retry. The retry time starts once the fault has

been detected by the offending channel. Valid values are from 120ms to 83.88 seconds in 10µs increments.

Note: The retry delay time is determined by the longer of the MFR_RETRY_DELAY command or the time required

for the regulated output to decay below 12.5% of the programmed value. If the natural decay time of the output is

too long, it is possible to remove the voltage requirement of the MFR_RETRY_DELAY command by asserting bit 0 of

MFR_CHAN_CONFIG.

This command has two data bytes and is formatted in Linear_5s_11s format.

PMBus COMMAND DETAILS

LTC2977 Datasheet(PDF) 108 Page - Analog Devices

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