DIO6913

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DIO6913• V1.6

Output inductor L

There are several considerations in choosing this inductor.

1) Choose the inductance to provide the desired ripple current. It is suggested to choose the ripple current to

be about 40% of the maximum output current. The inductance is calculated as:

L =

40%

I

f

)

/V

V

(1

V

MAX

OUT,

SW

MAX

IN,

OUT

OUT







(3)

where fsw is the switching frequency and IOUT,MAX is the maximum load current. The DIO6913 regulator IC is

quite tolerant of different ripple current amplitude. Consequently, the final choice of inductance can be

slightly off the calculation value without significantly impacting the performance.

2) The saturation current rating of the inductor must be selected to be greater than the peak inductor current

under full load conditions.

ISAT,MIN>IOUT,MAX +

L

f

2

)

/V

V

(1

V

SW

MAX

IN,

OUT

OUT







(4)

3) The DCR of the inductor and the core loss at the switching frequency must be low enough to achieve the

desired efficiency requirement. It is desirable to choose an inductor with DCR < 50 mΩ to achieve a good

overall efficiency.

DIO6913 recommended table:

VOUT (V)

R2 (kΩ)

C2 (pF)

L1/ Partnumber

1

150

Null

2.2 μH/ SWPA6045S2R2NT (VLP6045-2R2M)

1.2

100

Null

2.2 μH/ SWPA6045S2R2NT (VLP6045-2R2M)

1.8

49.9

Null

3.3 μH/ SWPA8040S3R3NT (VLP6045-3R3M)

2.5

31.6

Null

3.3 μH/ SWPA8040S3R3NT (VLP6045-3R3M)

3.3

22.1

22 (option)

4.7 μH/ SWPA8040S4R7NT (CDRH8D43-4R7)

5

13.7

22 (option)

6.8 μH/ SWPA8040S6R8MT (CDRH8D43-6R8)