DIO60120

Version 1.3, Aug 2025

www.dioo.com

© 2025 Dioo Microcircuits Co., Ltd. Jiangsu

9

9. Application Information

Important notice: Validation and testing are the most reliable ways to confirm system functionality. The

application information is not part of the specification and is for reference purposes only.

Figure 17. Typical application

The DIO60120 is a synchronous buck regulator IC that integrates the adaptive constant-on-time (COT) control,

and 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. Under PWM mode, the converter operates with a typical 1 MHz

switching frequency to minimize the size of the inductor and capacitor. As the load current decreases, the

converter enters PSM (Power Save Mode), reducing the switching frequency to keep high efficiency over the

entire load current range.

Under Auto Mode, the DIO60120 enters PWM mode for medium to heavy load conditions or enters PSM (Power

Save Mode) for a light load.

Because of the high integration in the DIO60120 IC, the application circuit based on this regulator IC is rather

simple. Only the input capacitor, CIN, output capacitor, COUT, output inductor, L1, feedback capacitor, C1, and

feedback resistors (R1 and R2) need to be selected for the targeted application specifications.

9.1. Enable

When disabled, the device shutdown supply current is only 0.1 μA. When applying a voltage greater than the EN

logic high threshold, the DIO60120 enables all functions and the device initiates the soft-start phase. The

DIO60120 has a built-in 0.55 ms soft-start time to prevent output voltage overshoot and inrush current. When

the EN voltage falls below its logic low threshold, the device operation is disabled and the 1 kΩ active discharge

is enabled to discharge the output voltage to ground.