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LM20333AMHX PDF预览

LM20333AMHX

更新时间： 2024-11-12 05:41:59
品牌 Logo 应用领域
美国国家半导体 - NSC 稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管输出元件
页数 文件大小 规格书
22页 520K
描述
36V, 3A Synchronous Buck Regulator with Frequency Synchronization

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LM20333AMHX 技术参数

生命周期：Transferred包装说明：HSSOP,
Reach Compliance Code：unknownECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.6
Is Samacsys：N其他特性：OUTPUT VOLTAGE IS ADJUSTABLE UPTO 0.8
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：36 V
最小输入电压：4.5 V标称输入电压：12 V
JESD-30 代码：R-PDSO-G20长度：6.5 mm
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
最大输出电流：6 A封装主体材料：PLASTIC/EPOXY
封装代码：HSSOP封装形状：RECTANGULAR
封装形式：SMALL OUTLINE, HEAT SINK/SLUG, SHRINK PITCH认证状态：Not Qualified
表面贴装：YES切换器配置：BUCK
最大切换频率：240 kHz温度等级：AUTOMOTIVE
端子形式：GULL WING端子节距：0.65 mm
端子位置：DUAL宽度：4.4 mm
Base Number Matches：1

LM20333AMHX 数据手册

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January 20, 2009  
LM20333A  
36V, 3A Synchronous Buck Regulator with Frequency  
Synchronization  
General Description  
The LM20333A is a full featured synchronous buck regulator  
capable of delivering up to 3A of load current. The current  
mode control loop is externally compensated with only two  
components, offering both high performance and ease of use.  
The device is optimized to work over the input voltage range  
of 4.5V to 36V making it well suited for high voltage systems.  
Features  
4.5V to 36V input voltage range  
■
■
3A output current, 5.2A peak current  
130 mΩ/110 mΩ integrated power MOSFETs  
94% peak efficiency with synchronous rectification  
1.0% feedback voltage accuracy  
■
■
■
■
■
■
■
■
■
■
■
Current mode control, selectable compensation  
Oscillator synchronization from 250kHz to 1.5MHz  
Adjustable output voltage down to 0.8V  
Compatible with pre-biased loads  
The device features internal Over Voltage Protection (OVP)  
and Over Current Protection (OCP) circuits for increased sys-  
tem reliability. A precision Enable pin and integrated UVLO  
allows the turn on of the device to be tightly controlled and  
sequenced. Startup inrush currents are limited by both an in-  
ternally fixed and externally adjustable soft-start circuit. Fault  
detection and supply sequencing are possible with the inte-  
grated power good (PGOOD) circuit.  
Programmable soft-start with external capacitor  
Precision enable pin with hysteresis  
OVP, UVLO inputs and PGOOD output  
The LM20333A is designed to work well in multi-rail power  
supply architectures. The output voltage of the device can be  
configured to track a higher voltage rail using the SS/TRK pin.  
If the output of the LM20333A is pre-biased at startup it will  
not sink current to pull the output low until the internal soft-  
start ramp exceeds the voltage at the feedback pin.  
Internally protected with peak current limit, thermal  
shutdown and restart  
Accurate current limit minimizes inductor size  
Non-linear current mode slope compensation  
eTSSOP-20 exposed pad package  
■
■
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The switching frequency of the LM20333A can be synchro-  
nized to an external clock by use of the SYNC pin. The SYNC  
pin is capable of synchronizing to input signals ranging from  
250 kHz to 1.5 MHz.  
Simple to design, high efficiency point of load regulation  
The LM20333A is offered in an exposed pad 20-pin eTSSOP  
package that can be soldered to the PCB, eliminating the  
need for bulky heatsinks.  
High Performance DSPs, FPGAs, ASICs and  
Microprocessors  
Communications Infrastructure, Automotive  
■
■
Simplified Application Circuit  
30077401  
®
PowerWise is a registered trademark of National Semiconductor Corporation.  
© 2009 National Semiconductor Corporation  
300774  
www.national.com  
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