TK71537SCL_37 Ver la hoja de datos (PDF) - Toko America Inc

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TK71537SCL_37

LOW DROPOUT VOLTAGE REGULATOR

Toko America Inc  

TK715xx

APPLICATION INFORMATION (CONT.)

In general, the capacitor should be at least 1 µF and be rated for the actual ambient operating temperature range. The

table below shows typical characteristics for several types and values of capacitance. Please note that the ESR varies

widely depending upon manufacturer, type, size, and material.

ESR

Capacitance

1.0 µF

2.2 µF

3.3 µF

10 µF

Aluminum

Capacitor

2.4 Ω

2.0 Ω

4.6 Ω

1.4 Ω

Tantalum

Capacitor

2.3 Ω

1.9 Ω

1.0 Ω

0.5 Ω

Note: ESR is measured at 10 kHz.

Ceramic

Capacitor

0.140 Ω

0.059 Ω

0.049 Ω

0.025 Ω

BOARD LAYOUT

Copper pattern should be as large as possible. Power dissipation is 350 mW for SOT-23-3. A low ESR capacitor is

recommended. For low temperature operation, select a capacitor with a low ESR at the lowest operating temperature

to prevent oscillation, degradation of ripple rejection and increase in noise. The minimum recommended capacitance is

2.2 µF.

The internal reverse bias protection eliminates the requirement for a reverse voltage protection diode. This saves both

cost and board space.

VIN

GND

VOUT

+

+

January 1999 TOKO, Inc.

SOT-23-3 BOARD LAYOUT

Page 11

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