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LM26420XMHX PDF预览

LM26420XMHX

更新时间： 2024-11-06 05:42:03
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
28页 609K
描述
Dual 2.0A, High Frequency Synchronous Step-Down DC-DC Regulator

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中文翻译

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LM26420XMHX 技术参数

是否Rohs认证： 不符合生命周期：Transferred
包装说明：HSSOP, TSSOP20,.25Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.15其他特性：ALSO OPERATES IN ADJUSTABLE MODE FROM 0.8 TO 4.5V
模拟集成电路 - 其他类型：DUAL SWITCHING CONTROLLER控制模式：CURRENT-MODE
控制技术：PULSE WIDTH MODULATION最大输入电压：5.5 V
最小输入电压：3 V标称输入电压：5 V
JESD-30 代码：R-PDSO-G20长度：6.5 mm
湿度敏感等级：1功能数量：1
端子数量：20最高工作温度：125 °C
最低工作温度：-40 °C封装主体材料：PLASTIC/EPOXY
封装代码：HSSOP封装等效代码：TSSOP20,.25
封装形状：RECTANGULAR封装形式：SMALL OUTLINE, HEAT SINK/SLUG, SHRINK PITCH
峰值回流温度（摄氏度）：225认证状态：Not Qualified
子类别：Switching Regulator or Controllers表面贴装：YES
切换器配置：PHASE-SHIFT最大切换频率：2650 kHz
技术：BICMOS温度等级：AUTOMOTIVE
端子形式：GULL WING端子节距：0.65 mm
端子位置：DUAL处于峰值回流温度下的最长时间：NOT SPECIFIED
宽度：4.4 mmBase Number Matches：1

LM26420XMHX 数据手册

 浏览型号LM26420XMHX的Datasheet PDF文件第2页浏览型号LM26420XMHX的Datasheet PDF文件第3页浏览型号LM26420XMHX的Datasheet PDF文件第4页浏览型号LM26420XMHX的Datasheet PDF文件第5页浏览型号LM26420XMHX的Datasheet PDF文件第6页浏览型号LM26420XMHX的Datasheet PDF文件第7页 
August 31, 2010  
LM26420  
Dual 2.0A, High Frequency Synchronous Step-Down DC-  
DC Regulator  
General Description  
Features  
The LM26420 regulator is a monolithic, high frequency, dual  
PWM step-down DC/DC converter in a 16 Pin LLP and a 20  
Pin eTSSOP package. It provides all the active functions to  
provide local DC/DC conversion with fast transient response  
and accurate regulation in the smallest possible PCB area.  
With a minimum of external components, the LM26420 is  
easy to use. The ability to drive two 2.0A loads with an internal  
75 mΩ PMOS top switch and an internal 50 mΩ NMOS bottom  
switch using state-of-the-art 0.5 µm BiCMOS technology re-  
sults in the best power density available. The world-class  
control circuitry allows on-times as low as 30ns, thus sup-  
porting exceptionally high frequency conversion over the en-  
tire 3V to 5.5V input operating range down to the minimum  
output voltage of 0.8V. Switching frequency is internally set  
to 550 kHz or 2.2 MHz, allowing the use of extremely small  
surface mount inductors and chip capacitors. Even though the  
operating frequency is high, efficiencies up to 93% are easy  
to achieve. External shutdown is included, featuring an ultra-  
low stand-by current. The LM26420 utilizes current-mode  
control and internal compensation to provide high-perfor-  
mance regulation over a wide range of operating conditions.  
Additional features include internal soft-start circuitry to re-  
duce inrush current, pulse-by-pulse current limit, thermal  
shutdown, power good indicators, precision enables, and out-  
put over-voltage protection.  
Input voltage range of 3.0V to 5.5V  
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Output voltage range of 0.8V to 4.5V  
2.0A output current per output  
High Switching Frequencies  
2.2MHz (LM26420X)  
0.55MHz (LM26420Y)  
75mΩ PMOS switch  
50mΩ NMOS switch  
0.8V, 1.5% Internal Voltage Reference  
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Internal soft-start  
Independent power good for each output  
Independent precision enable for each output  
Current mode, PWM operation  
Thermal Shutdown  
Over voltage protection  
Start-up into Pre-biased Output Loads  
Outputs are 180° out of phase  
Applications  
Local 5V to Vcore Step-Down Converters  
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Core Power in HDDs  
Set-Top Boxes  
USB Powered Devices  
DSL Modems  
Powering Core and I/O voltages for FPGAs, CPLDs, and  
ASICs  
Typical Application Circuit  
30069664  
30069684  
© 2010 National Semiconductor Corporation  
300696  
www.national.com  
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