DIO70020

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© 2025 Dioo Microcircuits Co., Ltd. Jiangsu

DIO70020• Rev 1.2

Block Diagram

Application Information

Power supply considerations

A 10 μF ceramic capacitor from VIN to GND to prevent the input voltage from dropping during the hot-plug

condition is strongly recommended. However higher capacitance could help reduce the voltage drop.

Furthermore, bypassing the output with a 10 μF ceramic capacitor improves the immunity of the device to

short-circuit transients, because an output short will cause ringing on the input without the input capacitor. It

could destroy the internal circuitry when the input transient voltage exceeds the absolute maximum supply

voltage even for a short duration.

Enable

The logic enable controls the power switch, driver, and other circuitry to reduce the supply current. The supply

current is reduced to less than1 μA when a logic low is present on EN / EN pin. A logic high input on EN / EN

restores bias to the drive and control circuits and turns the power on. The enable input is compatible with both

TTL and CMOS logic levels.

Current limiting setting

Current limit is programmable to protect the power source from over current and short circuit conditions.

Connecting a resistor RSET from ISET pin to GND to control the current limit:

ILIM (A) =6800/RSET (Ω)

(1)

Current limit beyond 2.5 A is not recommended.

Overcurrent protection

The DIO70020 responds to over current conditions by limiting output current to the ILIM levels. When an over

current condition is detected, the device maintains a constant output current and reduces the output voltage

accordingly. Complete shut down occurs only if the fault is present long enough to activate thermal limit.