Technical Note

7/12

BD2220G, BD2221G

www.rohm.com

2011.05 - Rev.B

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

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Block Diagram

OCD

Delay

Counter

S Q

R

Charge

pump

TSD

UVLO

/OC

EN

VIN

VOUT

GND

VIN

GND

EN(/EN)

1

2

34

5

/OC

VOUT

Top View

Fig.37 Block diagram

Fig.38 Pin configuration

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Pin Description

Pin No.

Symbol

I/O

Function

1

VIN

-

Switch input and the supply voltage for the IC.

2

GND

-

Ground.

3

EN, /EN

I

Enable input.

EN: High level input turns on the switch. (BD2220G)

/EN: Low level input turns on the switch. (BD2221G)

4

/OC

O

Over-current notification terminal.

Low level output during over-current or over-temperature condition.

Open-drain fault flag output.

5

VOUT

O

Switch output.

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I/O Circuit

Symbol

Pin No.

Equivalent circuit

EN

(/EN)

3

EN

(/EN)

VOUT

5

VOUT

/OC

4

/OC