Ap7361, Application information – Diodes AP7361 User Manual

Page 12

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AP7361

Document number: DS33626 Rev. 9 - 2

12 of 22

www.diodes.com

October 2013

© Diodes Incorporated

AP7361

Application Information

Input Capacitor

A 1μF 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. 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 improve the transient response of the LDO. The AP7361 is stable with very small ceramic output
capacitors. Using a ceramic capacitor value that is at least 2.2μF with 10mΩ

≦ ESR ≦ 300mΩ on the output ensures stability. Higher capacitance

values help to improve line and load transient response. The output capacitance may be increased to keep low undershoot and overshoot. Output
capacitor must be placed as close as possible to OUT and GND pins.

Adjustable Operation

Adjustable operation is not available in the SOT223 TO252 and SO-8EP package.
The AP7361 provides output voltage from 0.8V to 5.0V through external resistor divider as shown below.

1uF

IN

GND

EN

OUT

Enable

ADJ

R2

R1

4.7uF

V

IN

V

OUT

AP7361

Adjustable Output

The output voltage is calculated by:





2

R

1

R

1

REF

V

OUT

V

Where V

REF

= 0.8V (the internal reference voltage)


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





1

REF

V

OUT

V

2

R

1

R

To maintain the stability of the internal reference voltage, R

2

need to be kept smaller than 80k

.


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