SMD Type

7

IC

■

Typical Characterisitics

Calculation

Step−Up

Step−Down

Voltage−Inverting

Vout

VF

Vin(min)

Vin(min)

Vsat

Vout

VF

Vin(min)

Vsat

Vout

|Vout|

VF

Vin

Vsat

1

f

1

f

1

f

ton

toff

ton

toff

1

ton

toff

ton

toff

1

ton

toff

ton

toff

1

2Iout(max)

ton

toff

1

2Iout(max)

2Iout(max)

ton

toff

1

(Vin(min)

Vsat)

Ipk(switch)

ton(max)

(Vin(min)

Vsat

Vout)

Ipk(switch)

ton(max)

(Vin(min)

Vsat)

Ipk(switch)

ton(max)

9

Ioutton

Vripple(pp)

Ipk(switch)(ton

toff)

8Vripple(pp)

9

Ioutton

Vripple(pp)

The following power supply characteristics must be chosen:

equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly affect the

line and load regulation.

NOTE: For further information refer to Application Note AN920A/D and AN954/D.

1.25 1

R2

R1

Figure 14. Design Formula Table

Switching Regulators

MC33063A