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LM20146MH PDF预览

LM20146MH

更新时间: 2024-11-11 11:33:55
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
22页 501K
描述
6A, Adjustable Frequency Synchronous Buck Regulator

LM20146MH 数据手册

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February 12, 2009  
LM20146  
6A, Adjustable Frequency Synchronous Buck Regulator  
General Description  
Features  
The LM20146 is a full featured adjustable frequency syn-  
chronous buck regulator capable of delivering up to 6A 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 re-  
quires two external components, providing maximum flexibil-  
ity and ease of use. The device is optimized to work over the  
input voltage range of 2.95V to 5.5V making it suitable for a  
wide variety of low voltage systems.  
Input voltage range 2.95V to 5.5V  
Accurate current limit minimizes inductor size  
97% peak efficiency  
Adjustable switching frequency (250 kHz to 750 kHz)  
16mand 20mintegrated FET switches  
Starts up into pre-biased loads  
Output voltage tracking  
Peak current mode control  
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 are possible with the  
integrated power good circuit.  
Adjustable output voltage down to 0.8V  
Adjustable Soft-Start with external capacitor  
Precision enable pin with hysteresis  
Integrated OVP, UVLO, power good and thermal  
shutdown  
eTSSOP-16 exposed pad package  
The LM20146 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 LM20146 is pre-biased at startup it will not  
pull the ouput low.  
Applications  
Simple to design, high efficiency point of load regulation  
from a 5V or 3.3V bus  
High Performance DSPs, FPGAs, ASICs and  
microprocessors  
The frequency of this device can be adjusted from 250 kHz to  
750 kHz by connecting an external resistor from the RT pin to  
ground.  
Broadband, Networking and Optical Communications  
Infrastructure  
The LM20146 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  
30053801  
®
PowerWise is a registered trademark of National Semiconductor Corporation.  
© 2009 National Semiconductor Corporation  
300538  
www.national.com  

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