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2011.02 - Rev.
© 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
BD9328EFJ
●Description
The BD9328EFJ is a synchronous step-down switching regulator that integrates 2 low resistance N-channel MOSFETs.
It achieves 2A 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) 2A 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 V
IN
20 V
Switch Voltage VSW 20 V
Power Dissipation for HTSOP-J8 Pd 3760
*1
mW
Package thermal resistance θja
*2
θja 29.27 ℃/W
Package thermal resistance θjc
*2
θjc 3.75 ℃/W
Operating Temperature Range Topr -40～+85 ℃
Storage Temperature Range Tstg -55～+150 ℃
Junction Temperature Tjmax 150 ℃
BST Voltage VBST VSW+7 V
EN Voltage VEN 20 V
All other pins VOTH 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.11027EAT55
