LTM4686BIVPBF datasheet(25/130 Pages) AD

25 / 130 page

LTM4686B

Rev. 0

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OPERATION

Input overvoltage fault threshold and response (VIN_

OV_FAULT_LIMIT, VIN_OV_FAULT_RESPONSE),

based on the SVIN pin voltage.

Input undervoltage warning threshold (VIN_UV_

WARN_LIMIT) based on the SVIN pin voltage.

Module input overcurrent warning threshold

(IIN_OC_WARN_LIMIT).

The control IC within the LTM4686B 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:

Channel output current (READ_IOUTn) and peak

observed value of READ_IOUTn (MFR_IOUT_PEAKn).

Channel output voltage (READ_VOUTn) and peak

observed value of READ_VOUTn (MFR_VOUT_PEAKn).

Channel output power (READ_POUTn).

Channel input current (MFR_READ_IINn) and module

input current (READ_IIN).

Channel temperatures (READ_TEMPERATURE_1n) and

peak observed values of READ_TEMPERATURE_1n

(MFR_TEMPERATURE_1_PEAKn).

Control IC temperature (READ_TEMPERATURE_2) and

peak observed value (MFR_TEMPERATURE_2_PEAK).

Input voltage (READ_VIN), based on the voltage of

the SVIN pin, and peak observed value of READ_VIN

(MFR_VIN_PEAK).

Channel topside power MOSFET (MTn) duty cycle

(READ_DUTY_CYCLEn).

Digitized cyclical telemetry is available at a 10Hz update

rate, typical. Through the use of the MFR_ADC_CONTROL

command, some signals of interest can be digitized more

frequently—up to a 125Hz update rate, typical. Availability

of newly digitized telemetry data can be made known via

the MFR_ADC_TELEMETRY_STATUS command.

Peak observed values of telemetry readback data can

be cleared with the MFR_CLEAR_PEAKS I2C command,

provided the WRITE_PROTECT register value permits

it. (Executing MFR_CLEAR_PEAKS can be performed

regardless of the state of the WP pin.)

Details on the LTM4686B’s Fault Log Feature follow:

Fault logging is enabled when MFR_CONFIG_ALL[7] = 1b.

A fault log is present in NVM when STATUS_MFR_

SPECIFICn[3]Reports “1b”, which is propagated to the

MFR Bit (Bit 12) of the STATUS_WORD register.

Retrieving fault log data, if present, is performed with

the MFR_FAULT_LOG command. 147 bytes of data

are retrieved using the PMBus-defined variant to the

SMBus block read protocol.

The fault log contents in NVM, if present, are cleared

by executing the MFR_FAULT_LOG_CLEAR command.

The fault log will not be written if a fault log is already

present in NVM.

The LTM4686B can be forced to write a fault log to

its NVM by executing the MFR_FAULT_LOG_STORE

command; the LTM4686B will behave as if a channel

faulted off. Note the command is NACKed and a CML

fault is reported if a fault log is already present at the

time of executing MFR_FAULT_LOG_STORE.

LTM4686BIVPBF 数据表(PDF) 25 Page - Analog Devices

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