BU28TA2WHFV Просмотр технического описания (PDF) - ROHM Semiconductor

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производитель

BU28TA2WHFV

1ch 200mA CMOS LDO Regulators

ROHM Semiconductor 

BUTA2WNVX series, BUTA2WHFV series

●Input/Output terminal equivalent circuit schematic

1pin (VOUT)

2pin (GND)

VIN

VOUT

STBY

3pin (STBY)

VIN

Technical Note

4pin (VIN)

Fig.２ Input/Output equivalent circuit

●About input/output capacitor

It is recommended to place a capacitor as close as possible to the

pins between the input terminal and GND or between the output

terminal and GND.

The capacitor between the input terminal and GND becomes valid

when source impedance increases or when wiring is long. The

larger the capacity of the output capacitor between the output

terminal and GND is, the better the stability and characteristics in

output load fluctuation become. However, please check the status

of actual implementation. Ceramic capacitors generally have

variation, temperature characteristics, and direct current bias

characteristics and the capacity value also decreases with time

depending on the usage conditions. It is recommended to select a

ceramic capacitor upon inquiring about detailed data of the related

manufacturer.

Capacity value of ceramic capacitor - DC bias characteristics

(Example)

10

0

-10

-20

-30

-40

-50

-60

-70

-80

-90

-100

0

10-V withstand voltage

F characteristics

10-V withstand voltage

B1characteristics

GRM188B11A105KA61D

10-V withstand voltage

B characteristics

6.3-V withstand voltage

B characteristics

10-V withstand voltage

F characteristics

4-V withstand voltage

X6S characteristics

0.5

1

1.5

2

2.5

3

3.5

4

DC Bias Voltage [V]

Fig.3 Capacity – bias characteristics

●About the equivalent series resistance (ESR) of a ceramic capacitor

Capacitors generally have ESR (equivalent series resistance) and it

operates stably in the ESR-IOUT area shown on the right. Since

ceramic capacitors, tantalum capacitors, electrolytic capacitors, etc.

generally have different ESR, please check the ESR of the

capacitor to be used and use it within the stability area range shown

in the right graph for evaluation of the actual application.

100 Unstable area

10

1

Stability area

0.1

0.01

0

50

100

150

200

IOUT [mA]

Fig.4 Stability area characteristics (Example)

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2011.01 - Rev.C

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