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LM20343 PDF预览

LM20343

更新时间: 2024-11-12 04:20:15
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 545K
描述
36V, 3A Adjustable Frequency Synchronous Buck Regulator

LM20343 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 m/110 mintegrated 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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