DIO60011/A

Version 1.2, Jun 2025

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© 2025 Dioo Microcircuits Co., Ltd. Jiangsu

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8.2. Undervoltage lockout

Undervoltage lockout protects the IC from insufficient input voltages. The DIO60011/A is disabled if the input

voltage falls below 2.15 V (typ). In this UVLO event, both the high-side and low-side power MOSFETs turn off.

8.3. Thermal shutdown

If the junction temperature of the device reaches the thermal shutdown limit of 150°C, the DIO60011/A shuts

down both high-side and low-side power MOSFETs. When the junction temperature reduces to the required

level (130°C typ), the device initiates a normal power-up cycle with soft-start.

8.4. Switch current limit and short-circuit protection

The protection function prevents the device from drawing excessive current in case of externally-caused

overcurrent or short-circuit conditions. If the current limit threshold is reached, the device delivers its maximum

output current. Detecting this condition for 32 switching cycles, the device turns off the high-side MOSFET for

about 500 μs and then restarts again with a soft-start cycle. As long as the overload condition is present, the

device hiccups that way, limiting the output power.

In FPWM devices, a negative current limit (ILIMN) is enabled to prevent excessive current from flowing backward

to the input. When the inductor current reaches ILIMN, the low-side MOSFET turns off and the high-side MOSFET

turns on and is kept on until tON time expires.

8.5. 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. For example, it is recommended that the resistance value of

R1 is 20 kΩ, then R2 can be calculated from Equation (1).

1

OUT

2

R

0.6V

-

V

0.6V

R





(1)

Figure 16. Feedback resistor dividers R1 and R2

8.6. Input capacitor CIN

With the maximum load current at 1 A, the maximum ripple current through the input capacitor is about 0.5 A. A

typical X7R or better grade ceramic capacitor with 6 V rating and greater than 10 µF capacitance can handle this

ripple current well. To minimize the potential noise problem, place this ceramic capacitor really close to the IN

and GND pins. Carefully minimize the loop area formed by CIN, and IN/GND pins.