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2011.02 - Rev.A

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

Single-chip Type with Built-in FET Switching Regulators

Simple Step-down

Switching Regulator

with Built-in Power MOSFET

BD9329AEFJ

●

Description

The BD9329AEFJ is a synchronous step-down switching regulator that integrates 2 low resistance N-channel MOSFETs.

It achieves 3A continuous output current over a wide input supply range. Current mode operation provides fast transient

response and easy phase compensation.

●

Features

1) Wide operating INPUT Range 4.2V～18.0V

2) 3A Output Current

3) Hi-side / Lo-side FET ON-resistance; 0.15 / 0.13Ω Power Switch

4) Low ESR Output Ceramic Capacitors are Available

5) Low Standby Current during Shutdown Mode

6) 380 kHz Fixed Operating Frequency

7) Feedback voltage 0.9V ±1.5% Accuracy at room temp. (±2.0% guaranteed for -25℃ to 85℃ temperature range)

8) Protection Circuits

Under Voltage Lockout Protection

Thermal Shutdown

Over Current Protection

9) HTSOP-J8 Package with Exposed thermal PAD.

●

Applications

Distributed Power System

Pre-Regulator for Linear Regulator

●

Absolute maximum ratings (Ta = 25℃)

Parameter

Symbol

Ratings

Unit

Supply Voltage

VIN

20

V

Switch Voltage

20

V

Power Dissipation for HTSOP-J8

Pd

3760

*1

mW

Package thermal resistance θja

*2

θ

ja

29.27

℃

/W

Package thermal resistance θjc

*2

θ

jc

3.75

℃

/W

Operating Temperature Range

Topr

-40～+85

℃

Storage Temperature Range

Tstg

-55～+150

℃

Junction Temperature

Tjmax

150

℃

BST Voltage

V

EN Voltage

20

V

All other pins

20

V

*1 Derating in done 30.08 mW/℃ for operating above Ta≧25℃(Mount on 4-layer 70.0mm×70.0mm×1.6mm board)

*2 Mount on 4-layer 50mm x 30mm x 1.6mm application board

No.11027EAT56