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BD3021HFP-M

Regulator with Voltage Detector and Watchdog Timer

ROHM Semiconductor 

BD3021HFP-M

Technical Note

●Pin Settings / Precautions

1. Vcc Pin

Insert a 0.33 ~ 1000µF capacitor between the Vcc and GND pins. The appropriate capacitance value varies by

application. Be sure to allow a sufficient margin for input voltage levels.

2. Output pins

It is necessary to place capacitors between each output pin and GND to prevent oscillation on the output. Usable

capacitance values range from 0.1µF ~ 1000µF. Abrupt fluctuations in input voltage and load conditions may affect the

output voltage. Output capacitance values should be determined only through sufficient testing of the actual application.

Vcc=5.6V～36V

Ta=-40℃～+125℃ Io=0A～500mA

Cin=0.33µF～100µF Cout=0.1µF～100µF

100

Unstable operating region

10

1

Stable operating

0.1

region

0.01

Vcc

(5.6~36V)

Cin

(0.33μF～)

Vcc

Vo

GND

Cout(0.1μF～)

ESR

(0.001Ω～)

Io(ROUT)

0.001

0

100 200 300 400 500

Cout_Io(mA)

ESR vs Io(reference data)

※Pin Settings / Precautions 2 Measurement circuit

3. CT pin

Connecting a capacitance of 0.01µF ~ 1µF on the CT pin is recommended.

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11/14

2010.11 - Rev.A

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