BD8963EFJ(2010) Ver la hoja de datos (PDF) - ROHM Semiconductor

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componentes Descripción

Fabricante

BD8963EFJ
(Rev.:2010)

Low Noise High-efficiency Switching Regulator with Built-in Power MOSFET

ROHM Semiconductor 

BD8963EFJ

Technical Note

5. Determination of output voltage

The output voltage VOUT is determined by the equation (6):

VOUT=(R2/R1+1)×VADJ・・・(6) VADJ: Voltage at ADJ terminal (0.8V Typ.)

With R1 and R2 adjusted, the output voltage may be determined as required.

Adjustable output voltage range : 1.0V ~ 2.5V

5

6

SW

8

ADJ

L

Co

Output

R2

R1

Fig.31 Determination of output voltage

Use 1 kΩ ~ 100 kΩ resistor for R1. If a resistor of the resistance higher than 100 kΩ is used, check the assembled set

carefully for ripple voltage etc.

The lower limit of input voltage depends on the output voltage.

Basically, it is recommended to use in the condition :

4.7

VCCmin = VOUT+2.25V.

Fig.32. shows the necessary output current value at the lower limit of

input voltage. (DCR of inductor : 0.05Ω)

4.2

This data is the characteristic value, so it’ doesn’t guarantee the

operation range,

3.7

3.2

Vo=2.5V

Vo=2.0V

Vo=1.5V

Vo=1.8V

2.7

0

0.5

1

1.5

2

2.5

3

OUTPUT CURRENT : IOUT[A]

Fig.32 minimum input voltage in each output voltage

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12/17

2010.06 - Rev.A

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