AP22811

Document number: DS39135 Rev. 4 - 2

13 of 17

www.diodes.com

July 2017

© Diodes Incorporated

AP22811

Under-voltage Lockout (UVLO)

Under-voltage lockout function (UVLO) keeps the internal power switch from being turned on until the power supply has reached at least 2V, even

if the switch is enabled. Whenever the input voltage falls below approximately 2V, the power switch is quickly turned off. This facilitates the design

of hot-insertion systems where it is not possible to turn off the power switch before input power is removed.

Discharge Function

The discharge function of the device is active when enable is disabled or de-asserted. The discharge function with the N-MOS power switch

implementation is activated and offers a resistive discharge path for the external storage capacitor. This is designed for discharging any residue of

the output voltage when either no external output resistance or load resistance is present at the output.

Output Reverse-Voltage/ Current Protection

The output reverse-voltage protection turns off the MOSFET switch whenever the output voltage is higher than the input voltage by 50mV for 6ms

and the MOSFET switch will turn on when output reverse-voltage/current conditions is removed.

Power Dissipation and Junction Temperature

The low on-resistance of the internal MOSFET allows the small surface-mount packages to pass large current. Using the maximum operating

2

Finally, calculate the junction temperature:

Where:

Board Layout Instruction

Placing input and output capacitors, 1

μF and 0.1μF+100μF respectively, close and next to the device pins must be implemented to minimize the

effects of parasitic inductance. For best performance, all trace lengths should be kept as short as possible. The input and output PCB traces

should be as wide as possible. Use a ground plane to enhance the power dissipation capability of the device.

Ordering Information

AP22811 X X - X

Packing

Package

W5 : SOT25

M8 : MSOP-8

7 : Tape & Reel

13 : Tape & Reel

Enable

A : Active High

B : Active Low

Part Number

Package Code

Packaging

7” and 13” Tape and Reel

Quantity

Part Number Suffix

AP22811AW5-7

W5

SOT25

3000/Tape & Reel

-7

AP22811BW5-7

W5

SOT25

3000/Tape & Reel

-7

AP22811AM8-13

M8

MSOP-8

2500/Tape & Reel

-13

AP22811BM8-13

M8

MSOP-8

2500/ Tape & Reel

-13