LT7184S datasheet(25/52 Pages) AD

25 / 52 page

Data Sheet

LT7184S

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Rev. 0

25 of 52



The RUNN pin is de-asserted, and ON_OFF_CONFIG has been configured such that the RUN pin de-assertion

causes immediate shutdown (ON_OFF_CONFIG Bit 0 and Bit 2 both set to 1).



The FAULTN pin for the channel is pulled low externally unless MFR_FAULT_RESPONSE has been cleared to

0x00.



Loss of SHARE_CLK, unless Bit 2 of MFR_CHAN_CONFIG_LT7184S has been cleared.

Warning and Fault Handling

The LT7184S continuously monitors the system for fault and warning conditions. The Fault responses are

configurable using the corresponding FAULT_RESPONSE commands, such as VOUT_UV_FAULT_RESPONSE,

VOUT_OV_FAULT_RESPONSE, etc. The possible list fault responses are as follows:



Continue Operation (ignore).



Shut down immediately and retry if the fault condition is no longer present.



Shut down immediately and latch off.

The remainder of this section describes the factory default warning and fault behavior. See Table 6. Refer to the

LT7184S PMBus/I2C Reference Manual for details on configuring fault and warning behavior. All faults and warnings

are indicated in PMBus STATUS commands.

When a warning occurs related to output voltage, output current, or temperature, the LT7184S pulls the ALERT pin

low, the corresponding bit is set in the appropriate STATUS command(s), and the channel continues to operate.

If the output falls below VOUT_UV_FAULT_LIMIT, the LT7184S responds as follows:



The channel's PGOODN pin is pulled low.



The ALERT pin is pulled low.



The VOUT_UV fault bit is set in the STATUS_VOUT, STATUS_BYTE, and STATUS_WORD commands.



The channel continues to operate while limiting the maximum valley current.

If a fault occurs due to an output overvoltage or input overvoltage, the LT7184S responds as follows:



The faulted channel(s) are shut down immediately.



The channel's FAULTN pin and PGOODN pin are pulled low.



The ALERT pin is pulled low.



The corresponding indicator bit(s) are set in the appropriate STATUS command(s).



After 10ms (time defined by MFR_RETRY_DELAY), the channel attempts to restart when the fault condition is no

longer present.

If a fault occurs due to overtemperature, the LT7184S responds as follows:



Both channels are shut down immediately.



Both channels' FAULTN pins and PGOODN pins are pulled low.



The ALERT pin is pulled low.



The overtemperature (OT) bit is set in the appropriate STATUS commands.



When the ADC measures that the temperature is below the overtemperature threshold, the channel attempts to

restart.

The LT7184S periodically compares the primary internal voltage reference against a secondary internal voltage

reference using the Analog-to-digital converter (ADC). If a failure is detected, the LT7184S responds as follows:



Both channels are shut down immediately



The FAULTN pins, PGOODN pins, and ALERT pins are all pulled low.



The internal reference fault bit is set in the STATUS commands.



Both channels remain off unless the reference recovers (for example, due to temperature drift), a

RESTOR_USER_ALL or MFR_RESET command is received, or input power is removed from both PVIN0 and EXTVCC.

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