AP7387

Document number: DS44416 Rev. 3 - 2

10 of 18

www.diodes.com

July 2022

© Diodes Incorporated

AP7387

Ordering Information

AP7387 - XX XXXX - XX

Packing

13/7: Tape & Reel

Output Voltage

30 : 3.0V

33 : 3.3V

36 : 3.6V

50 : 5.0V

Package

SA : SOT23

Y : SOT89

W5 : SOT25

FDC : U-DFN2020-6

(Type C)

FDCR : U-DFN2020-6R

(Type C)

YR : SOT89

Part Number

Package Code

Package

Packing

Quantity

Carrier

AP7387-XXSA-7

SA

SOT23

3000

Tape & Reel

AP7387-XXY-13

Y

SOT89

2500

Tape & Reel

AP7387-XXYR-13 (*)

YR

SOT89R

2500

Tape & Reel

AP7387-XXW5-7

W5

SOT25

3000

Tape & Reel

AP7387-XXFDC-7

FDC

U-DFN2020-6 (Type C)

3000

Tape & Reel

AP7387-XXFDCR-7

FDCR

U-DFN2020-6R (Type C)

3000

Tape & Reel

*: Future Product

Application Information

Output Capacitor

An output capacitor is required for the stability of the LDO. The recommended minimum output capacitance is 10

μF. A ceramic capacitor is

recommended with the temperature characteristics of X7R or X5R. Higher capacitance values help to improve load/line transient response. The

output capacitance may be increased to keep low undershoot/overshoot. Place the output capacitor as close as possible to OUT and GND pins.

Input Capacitor

A 1μF ceramic capacitor is recommended to connect between VIN 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 less noise. For PCB layout, a wide copper trace is required for both VIN and GND.

Current-Limit and Short-Circuit Protection

When the output current at VOUT pin is higher than the current-limit threshold or the VOUT pin is directly shorted to GND, current-limit protection

will trigger and clamp the output current at a pre-designed level to prevent overcurrent and thermal damage.

Thermal Protection

The AP7387 has internal thermal sense and protection circuits. When excessive power dissipation happens on the device, such as short circuit at

the output pin or very heavy load current with a large voltage drop across the device, the internal thermal protection circuit will trigger, and it will

shut down the power MOSFET to prevent the LDO from damage. As soon as the excessive thermal condition is removed and the temperature of

the device drops down, the thermal protection circuit will release the control of the power MOSFET and the LDO device will return to normal

operation.

Layout Considerations

For good ground loop and stability, the input and output capacitors should be located close to the input, output, and ground pins of the device. The

regulator ground pin should be connected to the external circuit ground to reduce voltage drop caused by trace impedance. Ground plane is