Diodes AP7363 Manuel d'utilisateur télécharger pdf (Page 7)

AP7363

Document number: DS35059 Rev. 8 - 2

7 of 14

www.diodes.com

December 2012

P7363

Application Note

Input Capacitor

A minimum 2.2μF ceramic capacitor is recommended between IN and GND pins to decouple input power supply glitch and noise. The amount of

the capacitance may be increased without limit. Larger input capacitor like 10μF will provide better load transient response. This input capacitor

must be located as close as possible to the device to assure input stability and reduce noise. For PCB layout, a wide copper trace is required for

both IN and GND pins. A lower ESR capacitor type allows the use of less capacitance, while higher ESR type requires more capacitance.

Output Capacitor

The output capacitor is required to stabilize and help the transient response of the LDO. The AP7363 is stable with any type of capacitor, with no

limitations on minimum or maximum ESR. The device is designed to have excellent transient response for most applications with a small amount

of output capacitance. The device is also stable with multiple capacitors in parallel, which can be of any type of value. Additional capacitance

helps to reduce undershoot and overshoot during transient loads. This capacitor should be placed as close as possible to OUT and GND pins for

optimum performance.

Adjustable Operation

The AP7363 provides output voltage from 0.6V to 5.0V through external resistor divider as shown below.

The output voltage is calculated by:

⎟

⎠

⎞

⎜

⎝

⎛

REF

OUT

Where V

REF

= 0.6V (the internal reference voltage)

Rearranging the equation will give the following that is used for adjusting the output to a particular voltage:

⎟

⎠

⎞

⎜

⎝

⎛

−= 1

REF

OUT

To maintain the stability of the internal reference voltage, R

need to be kept smaller than 10kΩ.

No Load Stability

Other than external resistor divider, no minimum load is required to keep the device stable. The device will remain stable and regulated in no

load condition.

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Diodes AP7363 Manuel d'utilisateur Page 7

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