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LM27222MX PDF预览

LM27222MX

更新时间： 2024-10-27 04:44:35
品牌 Logo 应用领域
美国国家半导体 - NSC 驱动器接口集成电路光电二极管
页数 文件大小 规格书
11页 602K
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High-Speed 4.5A Synchronous MOSFET Driver

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LM27222MX 数据手册

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March 2006  
LM27222  
High-Speed 4.5A Synchronous MOSFET Driver  
General Description  
Features  
n Adaptive shoot-through protection  
n 10ns dead time  
The LM27222 is a dual N-channel MOSFET driver designed  
to drive MOSFETs in push-pull configurations as typically  
used in synchronous buck regulators. The LM27222 takes  
the PWM output from a controller and provides the proper  
timing and drive levels to the power stage MOSFETs. Adap-  
tive shoot-through protection prevents damaging and effi-  
ciency reducing shoot-through currents, thus ensuring a ro-  
bust design capable of being used with nearly any MOSFET.  
The adaptive shoot-through protection circuitry also reduces  
the dead time down to as low as 10ns, ensuring the highest  
operating efficiency. The peak sourcing and sinking current  
for each driver of the LM27222 is about 3A and 4.5Amps  
respectively with a Vgs of 5V. System performance is also  
enhanced by keeping propagation delays down to 8ns. Effi-  
ciency is once again improved at all load currents by sup-  
porting synchronous, non-synchronous, and diode emulation  
modes through the LEN pin. The minimum output pulse  
width realized at the output of the MOSFETs is as low as  
30ns. This enables high operating frequencies at very high  
conversion ratios in buck regulator designs. To support low  
power states in notebook systems, the LM27222 draws only  
5µA from the 5V rail when the IN and LEN inputs are low or  
floating.  
n 8ns propagation delay  
n 30ns minimum on-time  
n 0.4Ω pull-down and 0.9Ω pull-up drivers  
n 4.5A peak driving current  
n MOSFET tolerant design  
n 5µA quiescent current  
n 30V maximum input voltage in buck configuration  
n 4V to 6.85V operating voltage  
n SO-8 and LLP packages  
Applications  
n High Current Buck And Boost Voltage Converters  
n Fast Transient DC/DC Power Supplies  
n Single Ended Forward Output Rectification  
n CPU And GPU Core Voltage Regulators  
Typical Application  
20117902  
FIGURE 1.  
© 2006 National Semiconductor Corporation  
DS201179  
www.national.com  
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LM27222MX 替代型号

型号 品牌 替代类型 描述 数据表
LM27222M NSC

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