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参数资料
| 型号： | LM20323AMHX |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 6 A SWITCHING REGULATOR, 570 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | TSSOP-20 |
| 文件页数： | 1/20页 |
| 文件大小： | 492K |
| 代理商： | LM20323AMHX |
January 15, 2009
LM20323A
36V, 3A 500 kHz Synchronous Buck Regulator
General Description
The LM20323A is a full featured 500kHz 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.
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.
The LM20323A 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 LM20323A 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.
The LM20323A is offered in an exposed pad 20-pin eTSSOP
package that can be soldered to the PCB, eliminating the
need for bulky heatsinks.
Features
■ 4.5V to 36V input voltage range
■ 3A output current, 5.2A peak current
■ 130 m/110 m integrated power MOSFETs
■ 93% peak efficiency with synchronous rectification
■ 1.0% feedback voltage accuracy
■ Current mode control, selectable compensation
■ Fixed 500 kHz switching frequency
■ Adjustable output voltage down to 0.8V
■ Compatible with pre-biased loads
■ Programmable soft-start with external capacitor
■ Precision enable pin with hysteresis
■ Integrated OVP, UVLO, PGOOD
■ 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
Applications
■ Simple to design, high efficiency point of load regulation
from a 4.5V to 36V bus
■ High Performance DSPs, FPGAs, ASICs and
Microprocessors
■ Communications Infrastructure, Automotive
Simplified Application Circuit
30077201
PowerWise is a registered trademark of National Semiconductor Corporation.
2009 National Semiconductor Corporation
300772
www.national.com
LM20323A
36V,
3A
500
kHz
Synchronous
Buck
Regulator
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM20323EVAL | 功能描述:电源管理IC开发工具 LM20323 EVAL BOARD RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| LM20323MH | 制造商:Texas Instruments 功能描述:Conv DC-DC Single Step Down 4.5V to 36V 20-Pin TSSOP EP Rail 制造商:Texas Instruments 功能描述:BUCK REG, 3A, 4V/36V, POWERWISE, 20TSSOP 制造商:Texas Instruments 功能描述:IC, DC-DC CONV; Primary Input Voltage:36V; No. of Outputs:1; Output Voltage:32V; Output Current:3A; No. of Pins:20; Operating Temperature Min:-40C; Operating Temperature Max:125C; Operating Temperature Range:-40C to +125C ;RoHS Compliant: Yes |
| LM20323MH/NOPB | 功能描述:直流/直流开关转换器 36V,3A 500 KHZ SYNC BUCK REG RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| LM20323MHE | 制造商:Texas Instruments 功能描述:Conv DC-DC Single Step Down 4.5V to 36V 20-Pin TSSOP EP T/R |
| LM20323MHE/NOPB | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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