DIO7004

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© 2019 DIOO MICROCIRCUITS CO., LTD

DIO7004• Rev 1.1

Block Diagram

Application Information

Power Supply Considerations

A 10μF 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. Further

more, bypassing the output with a 10μF 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.

Under Voltage Lockout

A voltage sense circuit monitors the input voltage. When the input voltage is below approximately 2.4V, a control

signal turns off the power switch.

Enable

The logic enable controls the power switch, the bias for the charge pump, driver, and other circuitry to reduce the

supply current. The EN control pin must be driven to a logic high or logic low for a clearly defined signal input.

Floating these control lines may cause unpredictable operation.

Over-Current Protection

The DIO7004 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.

Two possible overload conditions can occur. In the first condition, an excessive load occurs while the device is

enabled. When the excessive load occurs, very high currents may flow for a short time before the current limit

circuit can react. After the current limit circuit has tripped (reached the overcurrent trip threshold) the device

switches into constant current mode to limit the current close to ILIM.

Current

Sense

Current

Limit

Driver

UVLO

Thermal

Sense

Deglitch

EN/EN

IN

OUT

FLG

GND

Output Shutdown

Discharge Logic

GND