DIO6010

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DIO6010• Rev. 1.6

Input capacitor CIN

This ripple current through input capacitor is calculated as:

ICIN_RMS=IOUT

)

1

(

D

D

−

⋅

This formula has a maximum at VIN=2VOUT condition, where ICIN_RMS=IOUT/2. This simple worst-case condition is

commonly used for DC/DC design.

With the maximum load current at 1.2A. A typical X5R or better grade ceramic capacitor with 6V rating and more

than 1pcs 10uF capacitor can handle this ripple current well. To minimize the potential noise problem, place this

ceramic capacitor really close to the IN and GND pins. Care should be taken to minimize the loop area formed by

CIN, and IN/GND pins.

Output capacitor COUT

The output capacitor is selected to handle the output ripple noise requirements. Both steady state ripple and

transient requirements must be taken into consideration when selecting this capacitor. For the best performance,

it is recommended to use X5R or better grade ceramic capacitor with 6V rating and greater than 40µF

capacitance.

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

)

/

1

(

,

,

×

×

−

MAX

OUT

SW

MAX

IN

OUT

OUT

I

F

V

V

V

where Fsw is the switching frequency and IOUT,MAX is the maximum load current. The DIO6010 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

V

V

V

SW

MAX

IN

OUT

OUT

⋅

⋅

−

2

)

/

1

(

,

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<50mΩ to achieve a good

overall efficiency.