LM2641

更新时间： 2024-11-23 12:48:31

品牌	Logo	应用领域
德州仪器 - TI		开关控制器
页数	文件大小	规格书
31页	1364K
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LM2641 Dual Adjustable Step-Down Switching Power Supply Controller

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LM2641 数据手册

LM2641

www.ti.com

SNVS040B –JANUARY 2000–REVISED APRIL 2013

LM2641 Dual Adjustable Step-Down Switching Power Supply Controller

Check for Samples: LM2641

FEATURES

DESCRIPTION

The LM2641 is a dual step-down power supply

controller intended for application in notebook

personal computers and other battery-powered

equipment.

•

300 kHz Fixed-Frequency Switching

Switching Synchronization with an External

Signal up to 400 kHz

•

Optional Pulse-Skipping Mode

Adjustable Secondary Feedback

Input Undervoltage Lockout

Fixed-frequency synchronous drive of logic-level N-

channel power MOSFETs is combined with an

optional pulse-skipping mode to achieve ultra efficient

power conversion over a 1000:1 load current range.

The pulse-skipping mode can be disabled in favor of

fixed-frequency operation regardless of the load

current level.

Output Undervoltage Shutdown Protection

Output Overvoltage Shutdown Protection

Programmable Soft-Start (Each Controller)

5V, 50 mA Linear Regulator Output

Precision 2.5V Reference Output

28-pin TSSOP

High DC gain and current-mode feedback control

assure excellent line and load regulation and a wide

loop bandwidth for fast response to dynamic loads.

An internal oscillator fixes the switching frequency at

300 kHz. Optionally, switching can be synchronized

to an external clock running as fast as 400 kHz.

APPLICATIONS

•

Notebook and Subnotebook Computers

Wireless Data Terminals

An optional soft-start feature limits current surges

from the input power supply at start up and provides

a simple means of start-up sequencing.

Battery-Powered Instruments

Logic-level inputs allow the controllers to be turned

ON and OFF separately.

KEY SPECIFICATIONS

•

96 % Efficient

5.5 – 30 V Input Range

Dual Outputs Adjustable from 2.2 – 8 V

0.5 % Typical Load Regulation Error

0.002 %/V Typical Line Regulation Error

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.

All 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.

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与LM2641相关器件

型号	品牌	获取价格	描述	数据表
LM2641-ADJMDC	NSC	获取价格	IC DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, UUC, DIE, Switching Regulator or
LM2641-ADJMDC	TI	获取价格	DUAL SWITCHING CONTROLLER, 345kHz SWITCHING FREQ-MAX, UUC, DIE
LM2641-ADJMWC	NSC	获取价格	IC DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, UUC, WAFER, Switching Regulator
LM2641CS	NSC	获取价格	IC VREG 5 V-20 V ADJUSTABLE POSITIVE LDO REGULATOR, PSSO5, TO-263, 5 PIN, Adjustable Posit
LM2641CS	TI	获取价格	5 V-20V ADJUSTABLE POSITIVE LDO REGULATOR, PSSO5, TO-263, 5 PIN
LM2641CT	NSC	获取价格	暂无描述
LM2641CT	TI	获取价格	5 V-20V ADJUSTABLE POSITIVE LDO REGULATOR, PSFM5, PLASTIC, TO-220, 5 PIN
LM2641J/883	NSC	获取价格	IC VREG 5 V-20 V ADJUSTABLE POSITIVE LDO REGULATOR, CDIP16, CERAMIC, DIP-16, Adjustable Po
LM2641MTC-ADJ	NSC	获取价格	Dual Adjustable Step-Down Switching Power Supply Controller
LM2641MTC-ADJ	TI	获取价格	LM2641 Dual Adjustable Step-Down Switching Power Supply Controller

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