BA3258HFP,BA33D15HFP,BA33D18HFP

Technical Note

5/8

www.rohm.com

2011.03 - Rev.B

© 2011 ROHM Co., Ltd. All rights reserved.

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Block Diagrams / Standard Example Application Circuits

BA3258HFP

BA33D□□Series

Pin No.

Pin name

Function

1

Vcc

Power supply pin

2

N.C.

N.C. pin

3

GND

GND pin

4

Vo1

3.3 V output pin

5

Vo2

1.5 V/1.8 V output pin

FIN

GND

GND pin

*The N.C. pin is not electrically connected internally

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Input / Output Equivalent Circuits

BA3258HFP

BA33D□□Series

Fig. 27 BA3258HFP Input / Output Equivalent Circuit

Fig. 28 BA33D□□Series Equivalent Circuit

Pin No.

Pin name

Function

1

Vcc

Power supply pin

2

Output voltage monitor pin

3

GND

GND pin

4

Vo2

1.5 V output pin

5

Vo1

3.3 V output pin

FIN

GND

GND pin

Vcc

Vo2

Vo2_S

Vcc

Vo1

Current

Limit

Thermal

Shutdown

Current

Limit

GND

3.3V

1μF

1.5V

1μF

3.3μF

1

2

5

4

FIN

Vcc

3

GND

PIN

External capacitor

setting range

Vcc (1 Pin) Approximately 3.3µF

Vo1 (5 Pin) 1µF to 1000µF

Vo2 (4 Pin) 1µF to 1000µF

PIN

External capacitor

setting range

Vcc (1 Pin) Approximately 3.3µF

Vo1 (4 Pin) 10µF to 1000µF

Vo2 (5 Pin) 10µF to 1000µF

Fig.25 BA3258HFP Block Diagram

TOP VIEW

HRP5

1 2 3 4 5

TOP VIEW

HRP5

1 2 3 4 5

Reference

Voltage

Current

Limit

Sat.

Prevention

Current

Limit

Sat.

Prevention

Thermal

Shut Down

GND(Fin)

Vcc

Vcc

Vcc

Vcc

Vcc

Vo2

GND

Vo1

N.C.

1

2

3

4

5

1μF

Co

Co

10μF

10μF

Fig.26 BA33D□□ Series Block Diagram

Vcc

Vo1/Vo2