Datasheet > DIO54270

DIO54270

更新时间： 2024-04-09 18:59:39

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帝奥微 - DIOO		/
页数	文件大小	规格书
11页	1233K
描述
The DIO54270 is high-efficiency, high frequency synchronous step-down DC-DC regulator ICs capable

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DIO54270 数据手册

DIO54270

Operation

The DIO54270 is a synchronous buck regulator IC that integrates the COT control, and top and bottom

switches on the same die to minimize the switching transition loss and conduction loss. With ultra low R_DS(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 DIO54270 provides protection functions such as cycle by cycle current limiting and thermal shutdown

protection. DIO54270 will sense the output voltage conditions for the fault protection.

Applications Information

Because of the high integration in the DIO54270 IC, the application circuit based on this regulator IC is rather

simple. Only input capacitor C_IN, output capacitor C_OUT, 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 10k and 1M is

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

13 k.

0.8V

R2=

(1)

OUT  0.8V

Input capacitor C_IN

This ripple current through input capacitor is calculated as:

I_{CIN_RMS}=I_OUT× D(1-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 C_IN, and IN/GND pins. In this

case, a 4.7 μF low ESR ceramic capacitor is recommended.

www.dioo.com

DIO54270• Rev. 1.3

1...4 5 678 9 10 11

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