LM2670

更新时间： 2024-11-22 22:11:11

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
23页	364K
描述
SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator with Sync

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LM2670 数据手册

August 1998

LM2670

SIMPLE SWITCHER^®High Efficiency 3A Step-Down

Voltage Regulator with Sync

General Description

The LM2670 series of regulators are monolithic integrated

Features

n Efficiency up to 94%

circuits which provide all of the active functions for

step-down (buck) switching regulator capable of driving up to

3A loads with excellent line and load regulation characteris-

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

external components)

n 150 mΩ DMOS output switch

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

37V ) versions

n 50µA standby current when switched OFF

tics. 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 adjust-

able output version.

2%maximum output tolerance over full line and load

The SIMPLE SWITCHER concept provides for a complete

design using a minimum number of external components.

The switching clock frequency can be provided by an inter-

nal fixed frequency oscillator (260KHz) or from an externally

provided clock in the range of 280KHz to 400Khz which al-

lows the use of physically smaller sized components. A fam-

ily of standard inductors for use with the LM2670 are avail-

conditions

n Wide input voltage range: 8V to 40V

n External Sync clock capability (280KHz to 400KHz)

n 260 KHz fixed frequency internal oscillator

n −40 to +125˚C operating junction temperature range

able from several manufacturers to greatly simplify the Applications

design process. The external Sync clock provides direct and

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

precise control of the output ripple frequency for consistent

filtering or frequency spectrum positioning.

switching regulators

n Efficient system pre-regulator for linear voltage

regulators

n Battery chargers

n Communications and radio equipment regulator with

synchronized clock frequency

The LM2670 series also has built in thermal shutdown, cur-

rent limiting and an ON/OFF control input that can power

down the regulator to a low 50µA quiescent current standby

condition. The output voltage is guaranteed to a 2% toler-

ance.

Typical Application

DS100942-3

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

DS100942

www.national.com

12 3 4 5 6 7...23

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与LM2670相关器件

型号	品牌	获取价格	描述	数据表
LM2670_05	NSC	获取价格	SIMPLE SWITCHER㈢ High Efficiency 3A Step-Down
LM2670-5.0MDC	NSC	获取价格	IC 5.4 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, UUC, DIE, Switching Regulator or
LM2670-5.0MDC	TI	获取价格	IC 5.4 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, UUC, DIE, Switching Regulator or
LM2670EP	TI	获取价格	LM2670EP Enhanced Plastic SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator w
LM2670LD-5.0	NSC	获取价格	5.4A SWITCHING REGULATOR, 280kHz SWITCHING FREQ-MAX, PDSO14, LLP-14
LM2670LD-5.0	TI	获取价格	5.4A SWITCHING REGULATOR, 280kHz SWITCHING FREQ-MAX, PDSO14, LLP-14
LM2670LD-ADJ	TI	获取价格	5.4A SWITCHING REGULATOR, 280kHz SWITCHING FREQ-MAX, PDSO14, LLP-14
LM2670LDX-12	NSC	获取价格	5.4A SWITCHING REGULATOR, 280kHz SWITCHING FREQ-MAX, PDSO14, LLP-14
LM2670LDX-12	TI	获取价格	5.4A SWITCHING REGULATOR, 280kHz SWITCHING FREQ-MAX, PDSO14, LLP-14
LM2670LDX-3.3	TI	获取价格	5.4A SWITCHING REGULATOR, 280kHz SWITCHING FREQ-MAX, PDSO14, LLP-14

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