TK71550ASCL Ver la hoja de datos (PDF) - Toko America Inc

Número de pieza

componentes Descripción

Fabricante

TK71550ASCL

LOW DROPOUT VOLTAGE REGULATOR

Toko America Inc  

TK715xxAS

APPLICATION INFORMATION

INPUT-OUTPUT CAPACITORS

Linear regulators require input and output capacitors in order to maintain regulator loop stability. The output capacitor

should be selected within the Equivalent Series Resistance (ESR) range as shown in the graphs below for stable

operation. The output capacitor CL can be reduced as the output voltage is increased. However, the output noise will

increase as CL is reduced, so the largest value of CL possilbe is recommended (CL = 4.7 mF or more).

Note: It is very important to check the selected manufacturers electrical characteristics (capacitance and ESR) over

temperature.

MULTI LAYER CERAMIC CAP

5.0

C

IN

=

0.1

µF

0.68 µF ≤ CL ≤ 4.7 µF or More

3.8

3.6

CL = 0.68 µF MLCC

3.4

3.2

CL = 4.7 µF MLCC or More

3.0

2.8

2.6

2.4

2.2 1.0 µF

2.0

1.8

1.6

1.5

0

3.3 µF

20 40

2.2 µF

60 80

IOUT (mA)

UNSTABLE AREA UNDER

AND TO THE LEFT

Stable area is

above the line

100

ESR ≥ 0.01 Ω

Range which can be used: VOUT ³ 2.8V

VOUT ³ 2.0V

VOUT ³ 1.5V

IOUT = 1 mA ~ Max, MULTI LAYER CERAMIC CAP. ³ 0.68 mF

IOUT = 1 mA ~ Max, MULTI LAYER CERAMIC CAP. ³ 1.0 mF

IOUT = 1 mA ~ Max, MULTI LAYER CERAMIC CAP. ³ 4.7 mF

TANTALUM CAP

5.0

CIN = 0.1 µF

3.8

3.6

CL = 0.1 µF TANTALUM

3.4

3.2

Stable area is

3.0

CL = 0.22 µF (TANTALUM) or More

above the line

2.8

2.6

2.4

2.2

2.0

1.8

1.6

0.1 µF

1.5

0 20 40 60 80 100

IOUT (mA)

UNSTABLE AREA UNDER

AND TO THE LEFT

0.1 µF ≤ CL ≤ 0.22 µF or More

ESR ≥ 1.0 Ω

Range which can be used: VOUT ³ 1.9V IOUT = 1 mA ~ Max, TANTALUM CAP. ³ 0.1 mF (CERAMIC CAP 0.22 mF

+ 2.2W

Capacitor used for evaluation: VOUT ³ 1.5V IOUT = 1 mA ~ Max, TANTALUM CAP. ³ 0.22 mF (CERAMIC CAP 0.22

mF + 2.2W

Page 10

March 2001 TOKO, Inc.

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