AP22804 / AP22814

Document number: DS39137 Rev. 1 - 2

14 of 19

www.diodes.com

November 2016

© Diodes Incorporated

AP22804 / AP22814

Application Information (Cont.)

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

ambient temperature (TA) and RDS(ON), the power dissipation can be calculated by:

PD = RDS(ON)× I

2

Finally, calculate the junction temperature:

TJ = PD x RJA + TA

Where:

TA = Ambient temperature °C

RJA = Thermal resistance

PD = Total power dissipation

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

AP228X4 X X - X

Packing

Package

M8 : MSOP-8

W5 : SOT25

SN : U-DFN2020-6

-7 : Tape & Reel

-13 : Tape & Reel

Enable

A : Active High

B : Active Low

Output

Current

0 : 2.5A

1 : 3.0A

Part Number

Package

Code

Packaging

7

”/13” Tape and Reel

Quantity

Part Number Suffix

AP228X4AM8-13

M8

MSOP-8

2500/Tape & Reel

-13

AP228X4AW5-7

W5

SOT25

3000/Tape & Reel

-7

AP228X4ASN-7

SN

U-DFN2020-6

3000/Tape & Reel

-7

AP228X4BM8-13

M8

MSOP-8

2500/Tape & Reel

-13

AP228X4BW5-7

W5

SOT25

3000/Tape & Reel

-7

AP228X4BSN-7

SN

U-DFN2020-6

3000/Tape & Reel

-7