AP3429 datasheet(8/11 Pages) DIODES

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AP3429/A

Document number: DS36561 Rev. 3 - 2

8 of 11

www.diodes.com

August 2015

AP3429/A

Application Information

Typical application circuit is shown in the application circuit and for the circuit parameters setting please refers to the following descriptions.

Under Voltage Lockout (UVLO) Circuit

The AP3429/A provides an under voltage lockout circuit to prevent it from undefined status. When the VIN drops lower than the UVLO detector

threshold, the UVLO circuit starts to operate, VREF stops, and high-side and low-side built-in switch transistors turn “OFF”. As a result, VOUT drops

according to the COUT capacitance value and the load. When the VIN is rising higher than UVLO released voltage, the IC will restart the operation.

Over Current Protection

The AP3429/A has internal over current protection function to protect from catastrophic failures. The IC can monitor the PMOS current, if the peak

current is higher than the current limit threshold, OCP function will be triggered and enter cycle by cycle current limit mode. If VFB drops under

0.3V for example, output node shorted to GND, AP3429 will enter latch off mode. IC will turn off both power switches. It will remain latch off state

until the VIN or Enable recycled to release it. AP3429A will enter hiccup mode to protect itself, if short circuit is removed, and VFB rises over 0.3V,

the AP3429A recovers to normal operation again.

Over Voltage Protection

The AP3429 has internal output OVP circuits. When VOUT is exceeds 120% of the regulation level for more than 40µs, the power switching will be

turned off. IC enter latch off mode and will restart until VIN or Enable voltage recycled.

Over Temperature Protection

The internal thermal temperature protection circuitry of AP3429/A is provided to protect the integrated circuit in the event that the maximum

junction temperature is exceeded. When the junction temperature exceeds +160°C, it shuts down the internal control circuit and switching power

MOSFET. The AP3429/A will restart automatically under the control of soft start circuit when the junction temperature decreases to +130°C.

Input Over Voltage Protection

When input voltage of AP3429/A is near 6.25V, the IC will enter Input-Over-Voltage-Protection. It would be shut down and there will be no output

voltage in this state. As the input voltage goes down below 6V, it will leave input OVP and recover the output voltage.

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