LTC1473 データシートの表示（PDF） - Linear Technology

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LTC1473

Dual PowerPath Switch Driver

Linear Technology 

LTC1473

APPLICATIONS INFORMATION

VGG Regulator Inductor and Capacitors

The VGG regulator provides a power supply voltage 8.5V

higher than any of the three main power source voltages

to allow the control of N-channel MOSFET switches. This

micropower, step-up voltage regulator is powered by the

highest potential available from the three main power

sources for maximum regulator efficiency.

Three external components are required by the VGG regu-

lator: L1, C1 and C2, as shown in Figure 5.

L1 is a small, low current, 1mH surface mount inductor. C1

provides filtering at the top of the 1mH switched inductor

and should be at least 1µF to filter switching transients.

The VGG output capacitor, C2, provides storage and filter-

ing for the VGG output and should be at least 1µF and rated

for 50V operation. C1 and C2 can be ceramic capacitors.

LTC1473

DCIN BAT1 BAT2

V+

TO GATE

DRIVERS

(8.5V + V+)

VGG

SWITCHING

REGULATOR

L1*

1mH

VGG

C1

1µF

SW

50V

C2

1µF

50V

GND

*COILCRAFT 1812LS-105 XKBC. (708) 639-6400

1473 F05

Figure 5. VGG Step-Up Switching Regulator

11

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