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SM8133B

White LED Driver IC

Nippon Precision Circuits  

SM8133B

PERIPHERAL PARTS

About the External Capacitors

The best capacitors for use with the SM8133B are multi-layer ceramic capacitors. When selecting a multi-layer

ceramic capacitor, only X5R and X7R dielectric types are strongly recommended, since the loss of capacitance

in various conditions is less than other types such as Z5U and Y5V. The much loss of capacitance in various

conditions may cause the output voltage unstable.

Table. The EIA three digit "TC" code

Lower temperature limit High temperature limit

X = −55°C

Y = −30°C

Z = +10°C

5 = +85°C

6 = +105°C

7 = +125°C

8 = +150°C

Maximum allowable capacitance

change from + 25°C (0V DC)

F = ± 7.5%

P = ± 10%

R = ± 15%

S = ± 22%

T = +22%/−33%

U = +22%/−56%

V = +22%/−82%

For example

: X5R

About the Input Capacitor "C4"

The parts layout of PCB may merely cause the “VOUT” output voltage unstable. In this case, increasing the

“C4” input capacitance value or adding another capacitor on the VIN input line is effective to solve the unsta-

ble output voltage.

QFN-20 Package

Package corner metals are not IC I/O pins. Don’t connect any lines to these corner metals.

Bottom view

SEIKO NPC CORPORATION —21

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