- 您现在的位置：买卖IC网 > PDF目录44549 > LM2641-ADJMDC (NATIONAL SEMICONDUCTOR CORP) DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, UUC PDF资料下载
参数资料
| 型号： | LM2641-ADJMDC |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, UUC |
| 封装： | DIE |
| 文件页数： | 14/22页 |
| 文件大小： | 531K |
| 代理商： | LM2641-ADJMDC |
National P/N LM2641 - Dual Adjustable Step-Down Switching Power Supply Controller
Full
production
N/A
1K+ $3.5000
reel
of
2500
[logo]UZ2T
LM2641M
TC-ADJ
LM2641-ADJ MDC
Full
production
N/A
N/A Samples
tray
of
N/A
-
LM2641-ADJ MWC
Full
production
N/A
wafer
jar
of
N/A
-
General Description
The LM2641 is a dual step-down power supply controller intended for application in notebook personal
computers and other battery-powered equipment.
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.
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.
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.
Logic-level inputs allow the controllers to be turned ON and OFF separately.
Features
q
300 kHz fixed-frequency switching
q
Switching synchronization with an external signal up to 400 kHz
q
Optional pulse-skipping mode
q
Adjustable secondary feedback
q
Input undervoltage lockout
q
Output undervoltage shutdown protection
q
Output overvoltage shutdown protection
q
Programmable soft-start (each controller)
q
5V, 50 mA linear regulator output
q
Precision 2.5V reference output
q
28-pin TSSOP
Key Specification
q
96% efficient
q
5.5 to 30V input range
q
Dual outputs adjustable from 2.2 to 8V
q
0.5% typical load regulation error
q
0.002%/V typical line regulation error
file:///H|/imaging/BITTING/cpl/20020808_1/08062002_10/NATL/08062002_HTML/LM2641.html (2 of 3) [Aug-09-2002 2:39:43 PM]
相关PDF资料 |
PDF描述 |
|---|---|
| LM2645MTD/NOPB | SWITCHING CONTROLLER, 335 kHz SWITCHING FREQ-MAX, PDSO48 |
| LM2651MTCX-2.5/NOPB | 2.6 A SWITCHING REGULATOR, 345 kHz SWITCHING FREQ-MAX, PDSO16 |
| LM2651MTC-2.5/NOPB | 2.6 A SWITCHING REGULATOR, 345 kHz SWITCHING FREQ-MAX, PDSO16 |
| LM2651MTC-1.8/NOPB | 2.6 A SWITCHING REGULATOR, 345 kHz SWITCHING FREQ-MAX, PDSO16 |
| LM2670-5.0MDC | 5.4 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, UUC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2641MTC-ADJ | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| LM2641MTC-ADJ/NOPB | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| LM2641MTCX-ADJ | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| LM2641MTCX-ADJ/NOPB | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| LM2642 | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
发布紧急采购，3分钟左右您将得到回复。