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NB634 PDF预览

NB634

更新时间: 2024-11-30 17:02:11
品牌 Logo 应用领域
芯源 - MPS /
页数 文件大小 规格书
13页 343K
描述
5A, 24V, 500kHz高效率同步降压变换器

NB634 数据手册

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NB634  
High Efficiency 5A, 24V, 500kHz  
Synchronous Step-down Converter  
The Future of Analog IC Technology  
DESCRIPTION  
FEATURES  
The NB634 is a high efficiency synchronous  
rectified step-down switch mode converter with  
built-in internal power MOSFETs. It offers a  
very compact solution to achieve 5A continuous  
output current over a wide input supply range  
with excellent load and line regulation. The  
NB634 operates at high efficiency over a wide  
output current load range.  
Wide 4.5V to 24V Operating Input Range  
5A Output Current  
Low RDS(ON) Internal Power MOSFETs  
Proprietary Switching Loss Reduction  
Technique  
Fixed 500kHz Switching Frequency  
Sync from 300kHz to 2MHz External Clock  
Internal Compensation  
Latch-off OCP Protection and Thermal  
Shutdown  
Current mode operation provides fast transient  
response and eases loop stabilization.  
Output Adjustable from 0.8V  
Available in a QFN14 (3mmx4mm) Package  
Full protection features include latch-off OCP and  
thermal shut down.  
APPLICATIONS  
The NB634 requires a minimum number of  
readily available standard external components  
and is available in a space saving QFN14 (3mm x  
4mm) package.  
Notebook Systems and I/O Power  
Networking Systems  
Digital Set Top Boxes  
Personal Video Recorders  
Flat Panel Television and Monitors  
Distributed Power Systems  
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green  
status, please visit MPS website under Products, Quality Assurance page.  
“MPS” and “The Future of Analog IC Technology” are registered trademarks of  
Monolithic Power Systems, Inc.  
TYPICAL APPLICATION FOR NOTEBOOK)  
Efficiency  
VOUT=1.8V, L=1.0uH  
4.5V-24V  
1
100  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
6
VIN  
VCC  
IN  
BST  
C1  
22uF  
3.3V  
V
=7V  
IN  
C4  
0.1uF  
9
V
=12V  
IN  
PG  
L1  
2.3uH  
R3  
NB634  
10  
11  
2,3,4,5  
VOUT 1.8V  
AAM  
VCC  
SW  
FB  
V
=24V  
IN  
R4  
R1  
10k  
C3  
0.1uF  
Rt  
24.9k  
C2  
47uF  
8
7
R2  
8.06k  
ON/OFF  
EN/SYNC  
GND  
12,13,14  
0
1
2
3
4
5
6
OUTPUT CURRENT (A)  
NB634 Rev. 0.94  
12/25/2013  
www.MonolithicPower.com  
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.  
© 2013 MPS. All Rights Reserved.  
1

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