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LM21305SQ

更新时间： 2024-11-26 11:33:59
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
24页 1429K
描述
5A Adjustable Frequency Synchronous Buck Regulator

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中文翻译

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LM21305SQ 技术参数

生命周期：Transferred包装说明：HVQCCN,
Reach Compliance Code：unknownECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.63
其他特性：ALSO OPERATES IN ADJUSTABLE MODE AS LOW AS 0.598V; 5 VOLT OUTPUT ALOS AVAILABLE模拟集成电路 - 其他类型：SWITCHING REGULATOR
控制模式：CURRENT-MODE控制技术：PULSE WIDTH MODULATION
最大输入电压：18 V最小输入电压：3 V
标称输入电压：12 VJESD-30 代码：S-XQCC-N28
长度：5 mm功能数量：1
端子数量：28最高工作温度：85 °C
最低工作温度：-40 °C最大输出电流：10.2 A
标称输出电压：2.5 V封装主体材料：UNSPECIFIED
封装代码：HVQCCN封装形状：SQUARE
封装形式：CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE座面最大高度：0.8 mm
表面贴装：YES切换器配置：BUCK
最大切换频率：1500 kHz温度等级：INDUSTRIAL
端子形式：NO LEAD端子节距：0.5 mm
端子位置：QUAD宽度：5 mm
Base Number Matches：1

LM21305SQ 数据手册

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September 27, 2011  
LM21305  
5A Adjustable Frequency Synchronous Buck Regulator  
General Description  
Key Specifications  
The LM21305 is a full-featured 5A synchronous buck POL  
regulator optimized for solution size, flexibilty, and high con-  
version efficiency. High power density LM21305 designs are  
achieved via monolithic integration of the high-side and low-  
side power MOSFETs, high switching frequency, current-  
mode control, and optimized thermal design. The efficiency  
of the LM21305 is elevated at light loads with diode emulation  
mode operation and at heavy loads by optimal design of the  
MOSFET gate drivers to minimize switch dead-times and  
body-diode conduction losses.  
Single-rail input voltage range from 3V to 18V  
■
■
■
■
0.598V feedback voltage reference  
300 kHz to 1.5 MHz switching frequency range  
LLP-28 package (5 x 5 x 0.8 mm, 0.5 mm pitch)  
Features  
High efficiency switcher core with integrated low RDSon  
power MOSFETs  
■
Resistor programmable switching frequency with  
frequency synchronization  
■
The LM21305 accepts a wide input voltage range of 3V to  
18V, facilitating interface to all intermediate bus voltages, in-  
cluding 3.3V, 5V and 12V rails. An output voltage as low as  
0.598V is supported with excellent setpoint accuracy and low  
ripple and RMS noise. The LM21305 offers flexible system  
configuration with programmable switching frequency from  
300 kHz to 1.5 MHz using one resistor or via external clock  
synchronization. On-chip bias supply sub-regulators alleviate  
the need for external bias power and simplify PCB layout. The  
device also offers internal soft-start to limit inrush current, pre-  
biased and monotonic startup capability, cycle-by-cycle cur-  
rent limiting, and thermal shutdown. Peak current-mode  
control with a high-gain error amplifier maintains stability  
throughout the entire input voltage and load current ranges  
and enables excellent line and load transient response.  
Internal soft-start with monotonic and pre-biased startup  
■
■
■
■
■
■
■
Low shutdown quiescent current  
Precision enable with hysteresis  
PGOOD indicator function  
Input under-voltage lock-out (UVLO)  
Output over-voltage protection (OVP)  
High-bandwidth load transient response with peak  
current-mode control  
Cycle-by-cycle current limiting  
■
■
Thermal shutdown  
Applications  
Offered in a thermally enhanced LLP-28 package, the  
LM21305 features internal output over-voltage and over-cur-  
rent protection circuits for increased system reliability. A pre-  
cision enable pin and integrated input UVLO allow the turn-  
on of the device to be tightly controlled and sequenced. An  
integrated open-drain power good indicator provides power  
rail sequencing capability and fault indication.  
POL regulation from 3.3V, 5V, and 12V supply rails  
■
■
High efficiency supply for DSPs, FPGAs, ASICs and  
processors  
Broadband, networking and optical communications  
infrastructure  
■
Typical Application Circuit  
30111101  
© 2011 National Semiconductor Corporation  
301111  
www.national.com  
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