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LTM8056

8056fa

For more information www.linear.com/LTM8056

is poorly controlled or the LTM8056 is hot-plugged into an

energized supply, the input network should be designed

to prevent this overshoot. This can be accomplished by

installing a small resistor in series with VIN, but the most

popular method of controlling input voltage overshoot is

to add an electrolytic bulk capacitor to the VIN net. This

capacitor’s relatively high equivalent series resistance

damps the circuit and eliminates the voltage overshoot.

The extra capacitor improves low frequency ripple filter-

ing and can slightly improve the efficiency of the circuit,

though it is likely to be the largest component in the circuit.

Thermal Considerations

The LTM8056 output current may need to be derated if

it is required to operate in a high ambient temperature or

deliver a large amount of continuous power. The amount

of current derating is dependent upon the input voltage,

output power and ambient temperature. The temperature

rise curves given in the Typical Performance Character-

istics section can be used as a guide. These curves were

generated by a LTM8056 mounted to a 58cm2 4-layer FR4

printed circuit board. Boards of other sizes and layer count

APPLICATIONS INFORMATION

Figure 6. Layout Showing Suggested External Components,

GND Plane and Thermal Vias

TO VOUT

GND

GND/THERMAL VIAS

GND

INPUT

RIN

INPUT

SENSE

8056 F06

COUT

VOUT

VIN

CIN

SVIN

MODE SYNC

RUN

IIN

ROUT

OUTPUT

SENSE

IOUT

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