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LM2650

更新时间： 2024-11-23 00:01:07
品牌 Logo 应用领域
美国国家半导体 - NSC 转换器
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12页 207K
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Synchronous Step-Down DC/DC Converter

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LM2650 数据手册

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November 2000  
LM2650  
Synchronous Step-Down DC/DC Converter  
General Description  
Features  
n Ultra high efficiencies (95% possible)  
The LM2650 is a step-down DC/DC converter featuring high  
efficiency over a 3A to milliamperes load range. This feature  
makes the LM2650 an ideal fit in battery-powered applica-  
tions that demand long battery life in both run and standby  
modes.  
n High efficiency over a 3A to milliamperes load range  
n Synchronous switching of internal NMOS power FETs  
n Wide input voltage range (4.5V to 18V)  
n Output voltage adjustable from 1.5V to 16V  
n Automatic low-power sleep mode  
n Logic-controlled micropower shutdown (IQSD ≤ 25 µA)  
n Frequency adjustable up to 300 kHz  
n Frequency synchronization with external signal  
n Programmable soft-start  
The LM2650 also features a logic-controlled shutdown mode  
in which it draws at most 25µA from the input power supply.  
The LM2650 employs a fixed-frequency pulse-width modu-  
lation (PWM) and synchronous rectification to achieve very  
high efficiencies. In many applications, efficiencies reach  
95%+ for loads around 1A and exceed 90% for moderate to  
heavy loads from 0.2A to 2A.  
n Short-circuit current limiting  
n Thermal shutdown  
n Available in 24-lead Small-Outline package  
A low-power hysteretic or ″sleep″ mode keeps efficiencies  
high at light loads. The LM2650 enters and exits sleep mode  
automatically as the load crosses ″sleep in″ and ″sleep out″  
thresholds. The LM2650 provides nodes for programming  
both thresholds via external resistors. A logic input allows the  
user to override the automatic sleep feature and keep the  
LM2650 in PWM mode regardless of the load level.  
Applications  
n Notebook and palmtop personal computers  
n Portable data terminals  
n Modems  
An optional soft-start feature limits current surges from the  
input power supply at start up and provides a simple means  
of sequencing multiple power supplies.  
n Portable Instruments  
n Global positioning devices (GPSs)  
n Battery-powered digital devices  
Typical Application  
LM2650-ADJ Efficiency  
DS012848-2  
DS012848-1  
Converting a Four-Cell Li Ion Battery to 5V  
© 2000 National Semiconductor Corporation  
DS012848  
www.national.com  
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