DIU6921

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DIU6921 • Rev. 1.1

Typical Application

Operation

The DIU6921 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, thus achieving the

minimum solution footprint.

The DIU6921 provides protection functions such as cycle-by-cycle current limiting and thermal shutdown

protection. The DIU6921 will sense the output voltage conditions for fault protection.

Applications Information

Because of the high integration in the DIU6921 IC, the application circuit based on this regulator IC is rather

simple. Only input capacitor CIN, output capacitor COUT, output inductor L1, and feedback resistors (R1 and R2)

need to be selected for the targeted application 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, choose large resistance values for both R1 and R2. A value of between 10 kΩ and 1 MΩ is highly

recommended for both resistors. If VOUT is 3.3 V, R1 = 100 kΩ is chosen, then R2 can be calculated to be 22

kΩ.

R2 =

1

OUT

R

0.6V

V

0.6V





(1)