AP2213 datasheet(18/22 Pages) BCDSEMI

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500mA LOW NOISE LDO REGULATOR

AP2213

Data Sheet

Nov. 2009 Rev. 1. 5

BCD Semiconductor Manufacturing Limited

Input Capacitor

A 1

µF minimum capacitor is recommended to be

placed between VIN and GND.

Output Capacitor

It is required to prevent oscillation. 1

µF minimum is

recommended when CBYP is unused. 2.2µF mini-

mum is recommended when CBYP is 100pF. The out-

put capacitor may be increased to improve transient

response.

Noise Bypass Capacitor

Bypass capacitor is connected to the internal voltage

reference. A 100pF capacitor connected from BYP to

GND make this reference quiet, resulting in a

significant reduction in output noise, but the ESR

stable area will be narrowed.

The start-up speed of the AP2213 is inversely

proportional to the value of 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 exceeding the

maximum power dissipation in application. Under all

possible operating conditions, the junction tempera-

ture must be within the range specified under abso-

lute maximum ratings to avoid thermal shutdown.

To determine if the power dissipated in the regulator

reaches the maximum power dissipation (see figure

16, 17), using:

TJ = PD*θJA + TA

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

Where: TJ≤TJ(max), TJ(max) is absolute maximum rat-

ings for the junction temperature; VIN*IGND can be

ignored due to its small value.

TJ(max) is 150oC, θJA is 90oC/W for TO-252-2 (1)

package and 160oC/W for SOIC-8 package.

Example: For 2.5V version packaged in SOIC-8,

IOUT=500mA, TA=50oC, VIN(Max) is:

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

Therefore, for good performance, please make sure

that input voltage is less than 3.75V without heatsink

when TA=50oC.

Application Information

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