LTM4676A datasheet(26/136 Pages) LINER

Il numero della parte	LTM4676A

Spiegazioni elettronici	Dual 13A or Single 26A 關Module Regulator with Digital Power System Management

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LTM4676A

26

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operaTion

• Output voltage turn-off delay time (the time delay

from the LTM4676A being commanded to turn off,

e.g., by the RUNn pin toggling from logic high to low,

before switching action ceases. TOFF_DELAYn).

• When commanded to turn off its output—or,

when turning off its output in response to a fault—

configuringwhethertheLTM4676A'soutput(VOUTn)

becomes high impedance (“High-Z” or “three

state”—turning off both MTn and MBn in the power

stage). (“Immediate Off”, ON_OFF_CONFIGn[0] = 1b

vs configuring the output voltage to be ramped down

according to TOFF_FALLn and/or TOFF_DELAYn set-

tings, ON_OFF_CONFIGn[0] = 0b).

• The amount of time (TOFF_MAX_WARN_LIMITn)

permitted to elapse after the LTM4676A is supposed

to have turned off its output, i.e., at the end of the

period dictated by TOFF_FALLn, after which, If the

output voltage has not fallen below 12.5% of the

former target voltage of regulation, the LTM4676A’s

output(VOUTn)isdeclaredtohavenotpowereddown

in a timely manner.

n

Configurable output voltage restart time. Subsequent to

theRUNnpinbeingpulledlow,theLTM4676ApullsRUNn

logic low, itself, and the output cannot be restarted until a

minimum time has elapsed—the restart delay time. This

delay assures proper sequencing of all system rails. The

minimum restart delay processed by the LTM4676A is

the longer of (TOFF_DELAYn + TOFF_FALLn + 136ms)

vs the commanded MFR_RESTART_DELAYn register

value. At the end of this delay, the LTM4676A releases

its RUNn pin.

n

Configurable fault-hiccup retry delay time. When a

fault occurs in which the LTM4676A’s fault response

behavior to that fault is to reattempt power-up of its

output voltage after said fault ceases to be present

(e.g., “Infinite Retry”), the delay time for the LTM4676A

to re-engage switching action is the longer of the

MFR_RETRY_DELAYn time vs the time required for

the output to decay below 12.5% of the formerly com-

manded output voltage value (unless this lattermost

criteria, i.e., requiring the output to decay below 12.5%

is negated by the setting of MFR_CHAN_CONFIGn[0]to

“1b”—which is the LTM4676A’s factory-NVM default

setting).

n

Output over/undervoltage fault responses (VOUT_OV_

FAULT_RESPONSEn,VOUT_UV_FAULT_RESPONSEn).

n

Time-averagedcurrentlimitwarningandinstantaneous

peak(cycle-by-cycle)faultthresholds,andfaultresponse

(IOUT_OC_WARN_LIMITn, IOUT_OC_FAULT_LIMITn,

IOUT_OC_FAULT_RESPONSEn).

n

Channel (VOUT0, VOUT1) overtemperature warning and

faultthresholds,andfaultresponse(OT_WARN_LIMITn,

OT_FAULT_LIMITn, OT_FAULT_RESPONSEn).

n

Channel (VOUT0, VOUT1) undertemperature fault

thresholds and fault response (UT_FAULT_LIMITn,

UT_FAULT_RESPONSEn).

n

Input overvoltage fault threshold and response

(VIN_OV_FAULT_LIMIT,VIN_OV_FAULT_RESPONSE),

based on the SVIN pin voltage.

n

Inputundervoltagewarningthreshold(VIN_UV_WARN_

LIMIT) based on the SVIN pin voltage.

n

Module input overcurrent warning threshold

(IIN_OC_WARN_LIMIT)

The control IC within the LTM4676A module ceases

switching action if control IC temperature exceeds 160°C

(Note 12). The control IC resumes operation after a 10°C

cool-down hysteresis. Note that these typical parameters

are based on measurements in a lab oven and are not

production tested. This overtemperature protection is

intended to protect the device during momentary overload

conditions. The maximum rated junction temperature will

be exceeded when this protection is active. Continuous

operation above the specified absolute maximum operat-

ing junction temperature may impair device reliability or

permanently damage the device.

TIME-AVERAGED AND PEAK READBACK DATA

Time-averaged telemetry readback data accessible via I2C

communications follow:

n

Channel output current (READ_IOUTn) and peak ob-

served value of READ_IOUTn (MFR_IOUT_PEAKn).

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