M6227xGP

REJ03D0849-0201 Rev.2.01 Nov 14, 2007

Page 4 of 5

Application Circuit (3.3 V Output DC/DC Converter; M62270GP)

100

µF

0.1

Ω

M62270

100

µF

IN

CLM

GND

Collector

1 k

Ω

1 k

Ω

47

µH

2

1

3

4

5

+

+

Figure 1 Example of Application Circuit of M62270GP

• Current limit detection:

When the voltage drop between 4-pin and 5-pin becomes 150 mV or more, current limit detection circuit starts to

operate. In the example of application (Figure 1), the current is limited to 1.5 A.

The Expression of Circuit Constants

Constants

Expressions

)

1

+

∆l

O

− T

OFF

1

lpk

∆l

O

1

2

∆V

0.15

Ipk

1

Note:

Forward voltage drop of an external diode.

Vsat: Output saturation voltage of an external switching transistor.

Choose an external transistor, diode and inductor with peak current rating greater than "Ipk".