L4995 데이터 시트보기 (PDF) - STMicroelectronics

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L4995

5V, 500mA low drop voltage regulator

STMicroelectronics 

L4995

3

Application information

Application information

Figure 26. L4995 application schematic(1)

6I

6S

6O

%N

6CW

#TW

7I

3TARTUP

6OLT AGE

2EFERENCE

6

M6 ?

WATCHDOG

#O

6O S

#O

GND

2ES

6CR

,OW6O LTAGE

2ESET

#TR

'!0'-3

1. The input capacitor Cs > 200nF is necessary for the smoothing of line disturbances. The output capacitor

C01 > 100nF is necessary for the stability of the regulation loop. In order to dampen output voltage

oscillations during high load current surges, it is recommended an additional electrolytic capacitor C02 >

10µF to be placed at the output pin.

Figure 27. Stability region(1)

100

Unstable region

10

1

Stability region

0.1

ESR min

ESR max

0.01

Undefined region

0.001

0.5 5 10 15 20 25 30 35 40 45 50

Co (uF)

1. The curve which describes the minimum ESR is derived from characterization data on the regulator with

connected ceramic capacitors which feature low ESR values (at 100 kHz). Any capacitor with further lower

ESR than the given plot value must be evaluated in each and every case.

Doc ID 13103 Rev 13

17/35

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