LTM4613 datasheet(25/30 Pages) LINER

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LTM8003

8003fc

For more information www.linear.com/LTM8003

Fault Tolerance

The fixed output version of LTM8003 is designed to tol-

erate a single fault condition. Shorting two adjacent pins

together or leaving one single pin floating does not raise

VOUTorcausedamagetotheLTM8003µModuleregulator.

Table 2 describe the effects that result from shorting ad-

jacent pins. Note that, since all pins are redundant, there

is no analysis describing what happens when a single pin

opens. The NC pins must be left floating to ensure fault

tolerance.

Table 3. Table 2. FMEA Analysis — Adjacent Pin Short Test

PIN NAME

HEAT

SMOKE

EFFECT

VIN–NC

Circuit behaves normally.

VIN–RUN

Circuit behaves normally.

RUN–NC

Circuit behaves normally.

RUN–RT

VOUT falls to 0V. Device can be damaged if EN/UV voltage is higher than RT ABS MAX.

RUN–GND

Vout falls to 0V.

RT–GND

SW frequency increases. VOUT may fall below regulation voltage.

RT–GND BANK1

SW frequency increases. VOUT may fall below regulation voltage.

RT–TRSS

VOUT will fall below regulation voltage.

TR/SS–SYNC

VOUT will fall below regulation voltage.

TR/SS–GND BANK1

VOUT will fall below regulation voltage.

SYNC–GND

Circuit behaves normally.

SYNC–PG

Circuit behaves normally.

SYNC–GND BANK1

Circuit behaves normally.

BIAS–GND BANK1

Efficiency may decrease.

BIAS–VOUT BANK3

Efficiency may decrease. If BIAS is tied to a voltage source > VOUT, VOUT may rise.

If BIAS is tied to a votlage source < VOUT, VOUT may be reduced.

VOUT BANK3–GND BANK1

VOUT will fall to 0V.

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