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LT1913

1913f

TYPICAL APPLICATIONS

sistance. Because of the large output current capability of

the LT1913, it is possible to dissipate enough heat to raise

the junction temperature beyond the absolute maximum of

125°C. When operating at high ambient temperatures, the

maximum load current should be derated as the ambient

temperature approaches 125°C.

Power dissipation within the LT1913 can be estimated by

calculating the total power loss from an efﬁciency measure-

ment and subtracting the catch diode loss and inductor

loss. The die temperature is calculated by multiplying the

LT1913 power dissipation by the thermal resistance from

junction to ambient.

Other Linear Technology Publications

Application Notes 19, 35 and 44 contain more detailed

descriptions and design information for buck regulators

and other switching regulators. The LT1376 data sheet

has a more extensive discussion of output ripple, loop

compensation and stability testing. Design Note 100

shows how to generate a bipolar output supply using a

buck regulator.

APPLICATIONS INFORMATION

5V Step-Down Converter

VIN

6.5V TO 25V

VOUT

3.5A

10μF

0.47μF

47μF

100k

f = 600kHz

D: ON SEMI MBRA340

L: NEC MPLC0730L4R7

15k

63.4k

4.7μH

536k

GND

680pF

ON OFF

LT1913

1913 TA02

RUN/SS

BOOST

SYNC

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