Technical Note

2/15

BD9329AEFJ

www.rohm.com

2011.02 - Rev.A

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

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Operation Range (Ta= -40～85℃)

Parameter

Symbol

Ratings

Unit

Min

Typ

Max

Supply Voltage

4.2

12

18

V

SW Voltage

-0.5

-

18

V

Output current

-

-

3

A

Output voltage range

0.9

-

V

●

Electrical characteristics (Unless otherwise specified VIN=12V Ta=25℃)

Parameter

Symbol

Limits

Unit

Conditions

Min

Typ

Max

Error amplifier block

FB input bias current

-

0.02

2

µA

Feedback voltage1

0.886

0.900

0.914

V

Voltage follower

Feedback voltage2

0.882

0.900

0.918

V

Ta=-25℃～85℃

SW block – SW

Hi-side FET On-resistance

-

0.15

-

Ω

Lo-side FET On-resistance

-

0.13

-

Ω

Hi/Lo-side FET Leak current

-

0

10

µA

Switch Current Limit

3.5

-

-

A

Maximum duty cycle

-

90

-

%

General

Enable Sink current

90

180

270

µA

Enable Threshold voltage

1.0

1.2

1.4

V

Under Voltage Lockout threshold

3.5

3.75

4.0

V

Under Voltage Lockout Hysteresis

-

0.3

-

V

Soft Start Current

5

10

15

µA

Soft Start Time

-

22

-

ms

Operating Frequency

300

380

460

kHz

Circuit Current

-

1.2

3

mA

Quiescent Current

-

15

27

µA