FSP3603 datasheet(6/9 Pages) FOSLINK

Part #	FSP3603

Description	1.2MHZ MICROPOWER SYNCHRONOUS STEP-UP CONVERTER

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Manufacturer	FOSLINK [FOSLINK SEMICONDUCTOR CO.,LTD]

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1.2MHZ MICROPOWER SYNCHRONOUS STEP-UP CONVERTER

2007-4-19

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FSP3603

TYPICAL CHARACTERISCITS (CONTINUED)

TYPICAL APPLICATION CIRCUIT

APPLICATION INFORMATION

Setting the Output Voltage

An external resistor divider is used to set the output voltage. The output voltage of the switching regulator (VOUT) is

determined by the following equation:

Table 1 list the resistor selection for output voltage setting.

VOUT

R1(Ω)

R2(Ω)

3.3V

1.02M

604k

5.0V

1.02M

332k

Inductor Selection

The high switching frequency of 1.2MHz allows for small surface mount inductors. For most designs, the

FSP3603 operates with inductors of 4.7µH to 10µH.The equation below can help to select the inductor, the

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