Datasheet > LM2673_08

LM2673_08

更新时间： 2024-09-29 04:44:35

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
26页	651K
描述
SIMPLE SWITCHER㈢ 3A Step-Down Voltage Regulator with Adjustable Current Limit

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LM2673_08 数据手册

February 29, 2008

LM2673

SIMPLE SWITCHER^®3A Step-Down Voltage Regulator with

Adjustable Current Limit

General Description

Features

The LM2673 series of regulators are monolithic integrated

circuits which provide all of the active functions for a step-

down (buck) switching regulator capable of driving up to 3A

loads with excellent line and load regulation characteristics.

High efficiency (>90%) is obtained through the use of a low

ON-resistance DMOS power switch. The series consists of

fixed output voltages of 3.3V, 5V and 12V and an adjustable

output version.

Efficiency up to 94%

■

Simple and easy to design with (using off-the-shelf

external components)

Resistor programmable peak current limit over a range of

2A to 5A.

■

150 mΩ DMOS output switch

3.3V, 5V and 12V fixed output and adjustable (1.2V to

37V ) versions

■

The SIMPLE SWITCHER concept provides for a complete

design using a minimum number of external components. A

high fixed frequency oscillator (260KHz) allows the use of

physically smaller sized components. A family of standard in-

ductors for use with the LM2673 are available from several

manufacturers to greatly simplify the design process.

±2%maximum output tolerance over full line and load

conditions

■

Wide input voltage range: 8V to 40V

260 KHz fixed frequency internal oscillator

Softstart capability

■

Other features include the ability to reduce the input surge

current at power-ON by adding a softstart timing capacitor to

gradually turn on the regulator. The LM2673 series also has

built in thermal shutdown and resistor programmable current

limit of the power MOSFET switch to protect the device and

load circuitry under fault conditions. The output voltage is

guaranteed to a ±2% tolerance. The clock frequency is con-

trolled to within a ±11% tolerance.

−40 to +125°C operating junction temperature range

Applications

Simple to design, high efficiency (>90%) step-down

switching regulators

■

Efficient system pre-regulator for linear voltage regulators

■

Battery chargers

Typical Application

10091303

SIMPLE SWITCHER^®is a registered trademark of National Semiconductor Corporation

100913

www.national.com

12 3 4 5 6 7...26

中文翻译

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与LM2673_08相关器件

型号	品牌	获取价格	描述	数据表
LM2673LD-12	NSC	获取价格	IC 5.4 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, PDSO14, LLP-14, Switching Regula
LM2673LD-3.3	NSC	获取价格	IC 5.4 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, PDSO14, LLP-14, Switching Regula
LM2673LDX-12	NSC	获取价格	5.4A SWITCHING REGULATOR, 280kHz SWITCHING FREQ-MAX, PDSO14, LLP-14
LM2673LDX-3.3	NSC	获取价格	IC 5.4 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, PDSO14, LLP-14, Switching Regula
LM2673LDX-5.0	NSC	获取价格	5.4A SWITCHING REGULATOR, 280kHz SWITCHING FREQ-MAX, PDSO14, LLP-14
LM2673S-12	TI	获取价格	LM2673 SIMPLE SWITCHER 3A Step-Down Voltage Regulator with Adjustable Current
LM2673S-12	NSC	获取价格	SIMPLE SWITCHER 3A Step-Down Voltage Regulator with Adjustable Current Limit
LM2673S-12/NOPB	TI	获取价格	具有可调节电流限制功能的 8V 至 40V、3A SIMPLE SWITCHER® 降压转
LM2673S-3.3	TI	获取价格	LM2673 SIMPLE SWITCHER 3A Step-Down Voltage Regulator with Adjustable Current
LM2673S-3.3	NSC	获取价格	SIMPLE SWITCHER 3A Step-Down Voltage Regulator with Adjustable Current Limit

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