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LM20125MHX PDF预览

LM20125MHX

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
页数 文件大小 规格书
20页 578K
描述
5A, 500kHz PowerWise㈢ Synchronous Buck Regulator

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中文翻译

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LM20125MHX 技术参数

是否Rohs认证：不符合生命周期：Transferred
包装说明：TSSOP-16Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.16Is Samacsys：N
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：5.5 V
最小输入电压：2.95 V标称输入电压：5 V
JESD-30 代码：R-PDSO-G16JESD-609代码：e0
长度：5 mm湿度敏感等级：1
功能数量：1端子数量：16
最高工作温度：125 °C最低工作温度：-40 °C
最大输出电流：8.1 A封装主体材料：PLASTIC/EPOXY
封装代码：HSSOP封装等效代码：TSSOP16,.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：560 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 mmBase Number Matches：1

LM20125MHX 数据手册

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January 16, 2008  
LM20125  
5A, 500kHz PowerWise® Synchronous Buck Regulator  
General Description  
Features  
The LM20125 is a full featured 500 kHz synchronous buck  
regulator capable of delivering up to 5A of continuous output  
current. The current mode control loop can be compensated  
to be stable with virtually any type of output capacitor. For  
most cases, compensating the device only requires two ex-  
ternal components, providing maximum flexibility and ease of  
use. The device is optimized to work over the input voltage  
range of 2.95V to 5.5V making it suited for a wide variety of  
low voltage systems.  
Input voltage range 2.95V to 5.5V  
■
■
■
Accurate current limit minimizes inductor size  
97% efficiency with 500 kHz switching frequency  
32 mΩ integrated FET switches  
Starts up into pre-biased loads  
Output voltage tracking  
■
■
■
■
■
■
■
■
Peak current mode control  
Adjustable output voltage down to 0.8V  
Adjustable Soft-Start with external capacitor  
Precision enable pin with hysteresis  
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. Start-up inrush currents are limited by both an  
internally fixed and externally adjustable Soft-Start circuit.  
Fault detection and supply sequencing is possible with the  
integrated power good circuit.  
Integrated OVP, UVLO, power good and thermal  
shutdown  
eTSSOP-16 exposed pad package  
■
Applications  
The LM20125 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 LM20125 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.  
Simple to design, high efficiency point of load regulation  
from a 5V or 3.3V bus  
■
High Performance DSPs, FPGAs, ASICs and  
microprocessors  
■
Broadband, Networking and Optical Communications  
Infrastructure  
■
The LM20125 is offered in a 16-pin eTSSOP package with an  
exposed pad that can be soldered to the PCB, eliminating the  
need for bulky heatsinks.  
Typical Application Circuit  
30030201  
®
PowerWise is a registered trademark of National Semiconductor Corporation.  
© 2008 National Semiconductor Corporation  
300302  
www.national.com  
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