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LM20323A

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
页数	文件大小	规格书
20页	486K
描述
36V, 3A 500 kHz Synchronous Buck Regulator

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LM20323A 数据手册

January 20, 2009

LM20323A

36V, 3A 500 kHz Synchronous Buck Regulator

General Description

Features

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.

4.5V to 36V input voltage range

■

3A output current, 5.2A peak current

130 mΩ/110 mΩ integrated power MOSFETs

93% peak efficiency with synchronous rectification

1.0% feedback voltage accuracy

■

Current mode control, selectable compensation

Fixed 500 kHz switching frequency

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.

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

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.

Accurate current limit minimizes inductor size

Non-linear current mode slope compensation

eTSSOP-20 exposed pad package

■

Applications

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.

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.

300772

www.national.com

12 3 4 5 6 7...20

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与LM20323A相关器件

型号	品牌	获取价格	描述	数据表
LM20323AMH	NSC	获取价格	36V, 3A 500 kHz Synchronous Buck Regulator
LM20323AMHE	NSC	获取价格	36V, 3A 500 kHz Synchronous Buck Regulator
LM20323AMHX	NSC	获取价格	36V, 3A 500 kHz Synchronous Buck Regulator
LM20323MH	NSC	获取价格	36V, 3A PowerWise㈢ 500 kHz Synchronous Buck R
LM20323MH/NOPB	TI	获取价格	4.5-36V 3A 电流模式同步降压稳压器 \| PWP \| 20 \| -40 to 12
LM20323MHE	NSC	获取价格	36V, 3A PowerWise㈢ 500 kHz Synchronous Buck R
LM20323MHE/NOPB	NSC	获取价格	IC 6 A SWITCHING REGULATOR, 570 kHz SWITCHING FREQ-MAX, PDSO20, LEAD FREE, TSSOP-20, Switc
LM20323MHE/NOPB	TI	获取价格	4.5-36V 3A 电流模式同步降压稳压器 \| PWP \| 20 \| -40 to 12
LM20323MHX	NSC	获取价格	36V, 3A PowerWise㈢ 500 kHz Synchronous Buck R
LM20323MHX/NOPB	TI	获取价格	4.5-36V 3A 电流模式同步降压稳压器 \| PWP \| 20 \| -40 to 12

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