LM2677

更新时间： 2024-11-17 11:07:55

品牌	Logo	应用领域
德州仪器 - TI		开关控制器开关式稳压器开关式控制器电源电路开关式稳压器或控制器
页数	文件大小	规格书
34页	1462K
描述
具有同步的 SIMPLE SWITCHER 高效 5A 降压电压稳压器

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LM2677 数据手册

LM2677

www.ti.com

SNVS077I –MAY 2004–REVISED JUNE 2012

LM2677 SIMPLE SWITCHER® High Efficiency 5A Step-Down Voltage Regulator with Sync

Check for Samples: LM2677

FEATURES

DESCRIPTION

The LM2677 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 5A 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 92%

•

Simple and Easy to Design with (Using Off-the-

shelf External Components)

•

100 mΩ DMOS Output Switch

3.3V, 5V and 12V Fixed Output and Adjustable

(1.2V to 37V ) Versions

•

50μA Standby Current when Switched OFF

±2%maximum Output Tolerance Over Full Line

and Load Conditions

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 internal fixed frequency oscillator

(260KHz) or from an externally provided clock in the

range of 280KHz to 400Khz which allows the use of

physically smaller sized components. A family of

standard inductors for use with the LM2677 are

available from several manufacturers to greatly

simplify the design process. The external Sync clock

provides direct and precise control of the output ripple

frequency for consistent filtering or frequency

spectrum positioning.

•

Wide Input Voltage Range: 8V to 40V

External Sync Clock Capability (280KHz to

400KHz)

•

260 KHz Fixed Frequency Internal Oscillator

−40 to +125°C Operating Junction Temperature

Range

APPLICATIONS

•

Simple to Design, High Efficiency (>90%) Step-

down Switching Regulators

The LM2677 series also has built in thermal

shutdown, current 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 ensured to a ±2% tolerance.

•

Efficient System Pre-regulator for Linear

Voltage Regulators

•

Battery Chargers

Communications and Radio Equipment

Regulator with Synchronized Clock Frequency

Typical Application

Feedback

0.01 mF

Input

Voltage

8V to 40V

Boost

LM2677 - 5.0

22 mH

Output

Voltage

5V/5A

0.47 mF

Switch

Ground Output

3 x 15 mF/50V

1 kW

2 x 180 mF, 16V

6TQ045S

Optional External

Sync Clock

100 pF

(280 kHz to 400 kHz)

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

SIMPLE SWITCHER is a trademark of Texas Instruments.

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...34

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LM2677 替代型号

型号	品牌	替代类型	描述	数据表
LM43603	TI	功能相似	3.5V 至 36V、3A 同步降压转换器

与LM2677相关器件

型号	品牌	获取价格	描述	数据表
LM2677S-12	NSC	获取价格	SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator with Sync
LM2677S-12/NOPB	TI	获取价格	LM2677 SIMPLE SWITCHERÂ® High Efficiency 5A S
LM2677S-3.3	TI	获取价格	LM2677 SIMPLE SWITCHERÂ® High Efficiency 5A S
LM2677S-3.3	NSC	获取价格	SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator with Sync
LM2677S-3.3/NOPB	TI	获取价格	LM2677 SIMPLE SWITCHERÂ® High Efficiency 5A S
LM2677S-5.0	TI	获取价格	LM2677 SIMPLE SWITCHERÂ® High Efficiency 5A S
LM2677S-5.0	NSC	获取价格	SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator with Sync
LM2677S-5.0/NOPB	TI	获取价格	LM2677 SIMPLE SWITCHERÂ® High Efficiency 5A S
LM2677S-ADJ	TI	获取价格	LM2677 SIMPLE SWITCHERÂ® High Efficiency 5A S
LM2677S-ADJ	NSC	获取价格	SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator with Sync

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