qSI-3000LU Series

sBlock Diagram

sStandard External Circuit

sReference Data

µF or larger)

The SI-3000LU series can be operated on the circuit

even if a low ESR ceramic capacitor is used as the output

capacitor.

µF)

This capacitor is required in the case of an inductive input

line or long wiring.

1.5 V to 15 V)

R1 and R2: Resistors for output setting

The output voltage can be set by connecting R1 and R2

as shown in the diagram on the left.

R2: 100 k

Ω is recommended

• A monolithic IC is mounted.The inner frame stage is connected

to the GND pin (pin 2). Therefore, enlarging the copper lami-

nate area leading to the GND pin achieves a heat radiation

effect.

• How to calculate the junction temperature

section using a thermistor, etc. Substitute this value in the

following formula and calculate the junction temperature.

×θj–c+Tc (θj–c=5°C/W)

SI-3012LU

SI-3018LU, SI-3025LU, SI-3033LU, SI-3050LU

REF

TSD

+

–

GND

4

3

5

2

1

REF

TSD

+

–

GND

4

3

5

2

1

4

3

2

5

1

+

GND

+

1

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0

10

100

1000

Ta=25

°C

Ta=40

°C

Ta=60

°C

Ta=85

°C

Copper Laminate Area vs Power Dissipation

°C PWB size 40×40

SI-3018LU, SI-3025LU, SI-3033LU, SI-3050LU

SI-3012LU

4

3

2

5

1

+

GND

+