DIO6920H

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DIO6920H• Rev. 1.1

Operation

The DIO6920H is a synchronous buck regulator IC that integrates the COT control, top and bottom switches on

the same die to minimize the switching transition loss and conduction loss. With ultra low RDS(ON) power switches

and proprietary COT control, this regulator IC can achieve the highest efficiency and the highest switch

frequency simultaneously to minimize the external inductor and capacitor size, and thus achieving the minimum

solution footprint.

The DIO6920H provides protection functions such as cycle by cycle current limiting and thermal shutdown

protection. The DIO6920H will sense the output voltage conditions for the fault protection.

Applications Information

Because of the high integration in the DIO6920H IC, the application circuit based on this regulator IC is rather

simple. Only input capacitor CIN, output capacitor COUT, output inductor L and feedback resistors (R1 and R2)

need to be selected for the targeted applications specifications.

Feedback resistor dividers R1 and R2

Choose R1 and R2 to program the proper output voltage. To minimize the power consumption under light loads,

it is desirable to choose large resistance values for both R1 and R2. A value of between 10 k and 1 M is highly

recommended for both resistors. If VOUT is 3.3 V, R1 = 40.2 k is chosen, then R2 can be calculated to be 12 k.

R2=

1

765

.

0

765

.

0

R

V

V

V

OUT



(1)

Figure 12. Feedback resistor dividers R1 and R2

Input capacitor CIN

This ripple current through input capacitor is calculated as:

ICIN_RMS=IOUT

)

1

( D

D 



(2)

To minimize the potential noise problem, place a typical X5R or better grade 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. In this case,

a 4.7 μF low ESR ceramic capacitor is recommended.