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LM25088MHX-2 PDF预览

LM25088MHX-2

更新时间： 2024-11-15 05:42:03
品牌 Logo 应用领域
美国国家半导体 - NSC 控制器
页数 文件大小 规格书
26页 518K
描述
Wide Input Range Non-Synchronous Buck Controller

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LM25088MHX-2 数据手册

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June 5, 2009  
LM25088  
Wide Input Range Non-Synchronous Buck Controller  
General Description  
Features  
The LM25088 high voltage non-synchronous buck controller  
features all the necessary functions to implement an efficient  
high voltage buck converter using a minimum number of ex-  
ternal components. The LM25088 can be configured to op-  
erate over an ultra-wide input voltage range of 4.5V to 42V.  
This easy to use controller includes a level shifted gate driver  
capable of controlling an external N-channel buck switch. The  
control method is based upon peak current mode control uti-  
lizing an emulated current ramp. The use of an emulated  
control ramp reduces noise sensitivity of the pulse-width mod-  
ulation circuit, allowing reliable control of very small duty  
cycles necessary in high input voltage/low output voltage ap-  
plications. The LM25088 switching frequency is pro-  
grammable from 50 kHz to 1 MHz.  
Emulated current mode control  
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Drives external high-side N-channel MOSFET  
Ultra-wide input voltage range from 4.5V to 42V  
Low IQ Shutdown and Standby modes  
High duty cycle ratio feature for reduced dropout voltage  
Spread spectrum EMI reduction (LM25088-1)  
Hiccup timer for overload protection (LM25088-2)  
Adjustable output voltage from 1.205V with 1.5% feedback  
reference accuracy  
Wide bandwidth error amplifier  
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Single resistor oscillator frequency setting  
Oscillator synchronization capability  
The LM25088 is available in two versions: The LM25088-1  
provides a +/-5% frequency dithering function to reduce the  
conducted and radiated EMI, while the LM25088-2 provides  
a versatile restart timer for overload protection. Additional  
features include a low dropout bias regulator, tri-level enable  
input to control shutdown and standby modes, soft-start and  
oscillator synchronization capability. The device is available  
in a thermally enhanced TSSOP-16EP pin package.  
Programmable soft-start  
High voltage, low dropout bias regulator  
Thermal shutdown protection  
Package  
TSSOP-16EP  
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Simplified Application Schematic  
30087601  
© 2009 National Semiconductor Corporation  
300876  
www.national.com  
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