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LM20323AMHE PDF预览

LM20323AMHE

更新时间： 2024-11-12 05:41:59
品牌 Logo 应用领域
美国国家半导体 - NSC 稳压器
页数 文件大小 规格书
20页 486K
描述
36V, 3A 500 kHz Synchronous Buck Regulator

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中文翻译

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LM20323AMHE 技术参数

生命周期：Transferred包装说明：HSSOP,
Reach Compliance Code：unknownECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.32
其他特性：OUTPUT VOLTAGE IS ADJUSTABLE UPTO 0.8模拟集成电路 - 其他类型：SWITCHING REGULATOR
控制模式：CURRENT-MODE控制技术：PULSE WIDTH MODULATION
最大输入电压：36 V最小输入电压：4.5 V
标称输入电压：12 VJESD-30 代码：R-PDSO-G20
长度：6.5 mm功能数量：1
端子数量：20最高工作温度：125 °C
最低工作温度：-40 °C最大输出电流：6 A
封装主体材料：PLASTIC/EPOXY封装代码：HSSOP
封装形状：RECTANGULAR封装形式：SMALL OUTLINE, HEAT SINK/SLUG, SHRINK PITCH
认证状态：Not Qualified表面贴装：YES
切换器配置：BUCK最大切换频率：570 kHz
温度等级：AUTOMOTIVE端子形式：GULL WING
端子节距：0.65 mm端子位置：DUAL
宽度：4.4 mm

LM20323AMHE 数据手册

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January 20, 2009  
LM20323A  
36V, 3A 500 kHz Synchronous Buck Regulator  
General Description  
Features  
The LM20323A is a full featured 500kHz synchronous buck  
regulator capable of delivering up to 3A of load current. The  
current mode control loop is externally compensated with only  
two components, offering both high performance and ease of  
use. The device is optimized to work over the input voltage  
range of 4.5V to 36V making it well suited for high voltage  
systems.  
4.5V to 36V input voltage range  
■
■
3A output current, 5.2A peak current  
130 mΩ/110 mΩ integrated power MOSFETs  
93% peak efficiency with synchronous rectification  
1.0% feedback voltage accuracy  
■
■
■
■
■
■
■
■
■
■
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Current mode control, selectable compensation  
Fixed 500 kHz switching frequency  
The device features internal Over Voltage Protection (OVP)  
and Over Current Protection (OCP) circuits for increased sys-  
tem reliability. A precision Enable pin and integrated UVLO  
allows the turn-on of the device to be tightly controlled and  
sequenced. Startup inrush currents are limited by both an in-  
ternally fixed and externally adjustable soft-start circuit. Fault  
detection and supply sequencing are possible with the inte-  
grated power good (PGOOD) circuit.  
Adjustable output voltage down to 0.8V  
Compatible with pre-biased loads  
Programmable soft-start with external capacitor  
Precision enable pin with hysteresis  
Integrated OVP, UVLO, PGOOD  
Internally protected with peak current limit, thermal  
shutdown and restart  
The LM20323A is designed to work well in multi-rail power  
supply architectures. The output voltage of the device can be  
configured to track a higher voltage rail using the SS/TRK pin.  
If the output of the LM20323A is pre-biased at startup it will  
not sink current to pull the output low until the internal soft-  
start ramp exceeds the voltage at the feedback pin.  
Accurate current limit minimizes inductor size  
Non-linear current mode slope compensation  
eTSSOP-20 exposed pad package  
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Applications  
The LM20323A is offered in an exposed pad 20-pin eTSSOP  
package that can be soldered to the PCB, eliminating the  
need for bulky heatsinks.  
Simple to design, high efficiency point of load regulation  
■
from a 4.5V to 36V bus  
High Performance DSPs, FPGAs, ASICs and  
Microprocessors  
■
Communications Infrastructure, Automotive  
■
Simplified Application Circuit  
30077201  
®
PowerWise is a registered trademark of National Semiconductor Corporation.  
© 2009 National Semiconductor Corporation  
300772  
www.national.com  
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