BD28TD2WNVX-TL datasheet(3/41 Pages) ROHM

部品番号	BD28TD2WNVX-TL

部品情報	Ultra Small Package CMOS LDO Regulators suitable for High-density Mounting

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Technical Note

3/40

BU□□TD2WNVX Series

www.rohm.com

2010.02 - Rev.A

Fig.4 Stability area characteristics (Example)

0.01

0.1

1

10

100

0

50

100

150

200

IOUT [mA]

●

Block diagram, recommended circuit diagram, and pin configuration diagram

BU□□TD2WNVX

●

Input / Output terminal equivalent circuit schematic

1pin (VOUT)

2pin (GND)

3pin (STBY)

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.

●

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.

PIN No.

Symbol

Function

1

VOUT

Voltage output

2

GND

Grounding

3

STBY

ON/OFF control of output voltage

(High: ON, Low: OFF)

4

VIN

Power input

Fig.3 Capacity – bias characteristics

4

3

1

2

Cin

VIN

GND

STBY

VSTBY

VOUT VOUT

Co

VREF

OCP

STBY

Discharge

TSD

VIN

Fig.1 Recommended circuit diagram

Recommended ceramic capacitor for Cin & Co

Murata Manufacturing Co., Ltd.

GRM188B11A474KA61D

Capacity value of ceramic capacitor - DC bias characteristics

(

Example)

-100

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

10

00.5

1

1.5

22.53

3.54

DC Bias Voltage [V]

10-V withstand voltage

B1characteristics

GRM188B11A105KA61D

10-V withstand voltage

B characteristics

6.3-V withstand voltage

B characteristics

4-V withstand voltage

X6S characteristics

10-V withstand voltage

F characteristics

10-V withstand voltage

F characteristics

Stable region

Unstable region

Cout=0.47μF ,Cin=0.47μF ,Temp=+25℃

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