AP2202K-2.9TRE1 データシートの表示（PDF） - BCD Semiconductor

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AP2202K-2.9TRE1

150mA RF ULDO REGULATOR

BCD Semiconductor 

150mA RF ULDO REGULATOR

Typical Application

Preliminary Datasheet

AP2202

VIN=3.8V

V IN

C IN

1.0µF

AP2202-2.8V

VIN

VOUT

EN

GND

BYP

C BYP

470pF

VOUT=2.8V

VOUT

+ COUT

2.2µF

tantalum

V IN

C IN

1.0 µF

AP2202-ADJ

V IN

V OUT

EN

GND

ADJ

C BYP

optional

VOUT

R1

+

COUT

2.2 µ F

R2

tantalum

VOUT=1.25* (1+R2/R1)

Figure 15. Typical Application of AP2202

Application Information

External Capacitors

Regarding good performance of regulator stability,

external capacitors required by the AP2202 should

be prudently selected.

Input Capacitor

If there is more than 10 inches of wire between the

input and the AC filter, or if a battery is used as the

input, a 1µF capacitor should be placed from IN to

GND.

Output Capacitor

It is required to prevent oscillation. 1.0µF minimum

is recommended when CBYP is unused. 2.2µF mini-

mum is recommended when CBYP is 470pF. The out-

put capacitor may be increased without limit for

large values to improve transient response.

In most cases, tantalum or aluminium electrolytic

capacitors are adequate.

Noise Bypass Capacitor

Bypass capacitor is connected to the internal voltage

reference. A 680pF capacitor connected from BYP to

GND leads reference to be quiet which results in a

significant reduction in output noise. When using

CBYP, output capacitors of 2.2µF or greater are

required for better stability.

The start-up speed of the AP2202 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.

Aug. 2005 Rev. 1. 3

BCD Semiconductor Manufacturing Limited

11

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