DIO703

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DIO703• Rev 1.4

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.

Furthermore, bypassing the output with a 10μF ceramic capacitor (the larger the better) 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 DIO703 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.

In the second condition, the load is gradually increasing beyond the recommended operating current. The current

is permitted to rise until the currentlimit threshold (ILIM) is reached or until the thermal limit of the device is