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MC33463

Variable Frequency Micropower DC-to-DC Converter

ON Semiconductor 

MC33463

Startup Circuit

MC33464N-30ATR

MMBT2907ALT1

2

In

1

Out

Gnd

3 10 k

10 k

Vin

MMBT2907ALT1

1.0 k

100 µF

100

3

Lx

47 µH

VO

3.3 V

MBRD0520LT1

MC33463H–33KT1

VLx Limiter

Drive

VFM

Controller

2

Output

100 µF

100 kHz

Oscillator

Vref

1 Gnd

Figure 20. Micropower Step–Down Application

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