AP2213

Document number: DS42665 Rev. 3 - 2

13 of 22

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September 2020

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AP2213

Application Information

Input Capacitor

A 1µF minimum capacitor is recommended to be placed between VIN and GND.

Output Capacitor

An output capacitor is required to prevent oscillation. A 1µF minimum is recommended when CBYP is unused. A 2.2µF minimum is recommended

when CBYP is 100pF. The output capacitor may be increased to improve transient response.

Noise Bypass Capacitor

A bypass capacitor is connected to the internal voltage reference. A small capacitor connected from BYP to GND makes this reference quiet,

resulting in a significant reduction in output noise, but the ESR stable area will be narrowed. In order to keep the output stability, it is

recommended to use the bypass capacitor no more than 100pF.

The start-up speed of the AP2213 is inversely proportional to the value of the reference bypass capacitor. In some cases, if output noise is not a

major concern and rapid turn-on is necessary, omit CBYP and leave BYP open.

Power Dissipation

Thermal shutdown may take place if the maximum power dissipation is exceeded in application. Under all possible operating conditions, the

junction temperature must be within the range specified under absolute maximum ratings to avoid thermal shutdown.

To determine if the power dissipated in the regulator reaches the maximum power dissipation (see Figure Power Dissipation vs. Ambient

Temperature (SOIC-8 Package), ESR vs. Output Current (COUT = 1µF)), use:

TJ = PD*θJA + TA

PD = (VIN-VOUT)*IOUT+VIN*IGND

Where: TJ

≤ TJ(max), TJ(max) is absolute maximum ratings for the junction temperature; VIN*IGND can be ignored due to its small value.

TJ(max) is +150°C, θJA is 90°C/W for TO-252-2 (3) package and 160°C/W for SOIC-8 package.

Example: For 2.5V version packaged in SOIC-8, IOUT = 500mA, TA = +50°C, VIN(Max) is:

(150°C-50°C)/(0.5A*160°C/W)+2.5V=3.75V

Therefore, for good performance, please make sure that the input voltage is less than 3.75V without heatsink when TA = +50°C.