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LM20343MHX

更新时间： 2024-09-23 04:20:15
品牌 Logo 应用领域
美国国家半导体 - NSC 稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管输出元件
页数 文件大小 规格书
20页 545K
描述
36V, 3A Adjustable Frequency Synchronous Buck Regulator

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中文翻译

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LM20343MHX 技术参数

是否Rohs认证： 不符合生命周期：Transferred
包装说明：TSSOP-20Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.19Is Samacsys：N
其他特性：OUTPUT VOLTAGE IS ADJUSTABLE FROM 0.8 TO 5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
JESD-609代码：e0长度：6.5 mm
湿度敏感等级：1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
封装等效代码：TSSOP20,.25封装形状：RECTANGULAR
封装形式：SMALL OUTLINE, HEAT SINK/SLUG, SHRINK PITCH峰值回流温度（摄氏度）：260
认证状态：Not Qualified子类别：Switching Regulator or Controllers
表面贴装：YES切换器配置：BUCK
最大切换频率：825 kHz温度等级：AUTOMOTIVE
端子面层：Tin/Lead (Sn85Pb15)端子形式：GULL WING
端子节距：0.65 mm端子位置：DUAL
处于峰值回流温度下的最长时间：40宽度：4.4 mm
Base Number Matches：1

LM20343MHX 数据手册

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August 12, 2008  
LM20343  
36V, 3A Adjustable Frequency Synchronous Buck  
Regulator  
General Description  
The LM20343 is a full featured 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.  
Features  
4.5V to 36V input voltage range  
■
■
3A output current, 5.2A peak current  
130 mΩ/110 mΩ integrated power MOSFETs  
94% peak efficiency with synchronous rectification  
1.5% feedback voltage accuracy  
■
■
■
■
■
■
■
■
■
■
■
Current mode control, selectable compensation  
Resistor programmed, 1MHz capable oscillator  
Adjustable output voltage down to 0.8V  
Compatible with pre-biased loads  
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.  
Programmable soft-start with external capacitor  
Precision enable pin with hysteresis  
OVP, UVLO inputs and PGOOD output  
The frequency of this device can be adjusted from 250 kHz to  
1.0 MHz by connecting an external resistor from the RT pin  
to ground.  
Internally protected with peak current limit, thermal  
shutdown and restart  
Accurate current limit minimizes inductor size  
Non-linear current mode slope compensation  
eTSSOP-20 exposed pad package  
■
■
■
The LM20343 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 LM20343 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.  
Applications  
Simple to design, high efficiency point of load regulation  
from a 4.5V to 36V bus  
■
The LM20343 is offered in an exposed pad 20-pin eTSSOP  
package that can be soldered to the PCB, eliminating the  
need for bulky heatsinks.  
High Performance DSPs, FPGAs, ASICs and  
Microprocessors  
■
Communications Infrastructure, Automotive  
■
Simplified Application Circuit  
30051701  
© 2008 National Semiconductor Corporation  
300517  
www.national.com  
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中文翻译

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