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参数资料
| 型号： | LM3940LD-3.3/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 固定正电压单路输出LDO稳压器 |
| 英文描述： | 3.3 V FIXED POSITIVE LDO REGULATOR, 1 V DROPOUT, DSO8 |
| 封装： | ROHS COMPLIANT, LLP-8 |
| 文件页数： | 1/12页 |
| 文件大小： | 328K |
| 代理商： | LM3940LD-3.3/NOPB |
July 2007
LM3940
1A Low Dropout Regulator for 5V to 3.3V Conversion
General Description
The LM3940 is a 1A low dropout regulator designed to provide
3.3V from a 5V supply.
The LM3940 is ideally suited for systems which contain both
5V and 3.3V logic, with prime power provided from a 5V bus.
Because the LM3940 is a true low dropout regulator, it can
hold its 3.3V output in regulation with input voltages as low as
4.5V.
The T0-220 package of the LM3940 means that in most ap-
plications the full 1A of load current can be delivered without
using an additional heatsink.
The surface mount TO-263 package uses minimum board
space, and gives excellent power dissipation capability when
soldered to a copper plane on the PC board.
Features
■ Output voltage specified over temperature
■ Excellent load regulation
■ Guaranteed 1A output current
■ Requires only one external component
■ Built-in protection against excess temperature
■ Short circuit protected
Applications
■ Laptop/Desktop Computers
■ Logic Systems
Typical Application
1208001
*Required if regulator is located more than 1″ from the power supply filter capacitor or if battery power is used.
**See Application Hints.
Connection Diagram/Ordering Information
1208002
3-Lead TO-220 Package
(Front View)
Order Part Number LM3940IT-3.3
NSC Drawing Number TO3B
1208003
3-Lead TO-263 Package
(Front View)
Order Part Number LM3940IS-3.3
NSC Drawing Number TS3B
1208010
3-Lead SOT-223
(Front View)
Order Part Number LM3940IMP-3.3
Package Marked L52B
NSC Drawing Number MP04A
2007 National Semiconductor Corporation
12080
www.national.com
LM3940
1A
Low
Dropout
Regulator
for
5V
to
3.3V
Conversion
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM3940LDX-3.3 | 功能描述:IC REG LDO 3.3V 1A 8-LLP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.1V 输入电压:最高 5.5V 电压 - 压降（标准）:- 稳压器数量:1 电流 - 输出:300mA 电流 - 限制（最小）:420mA 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 供应商设备封装:TSOT-23-5 包装:带卷 (TR) |
| LM3940N | 制造商:未知厂家 制造商全称:未知厂家 功能描述:1.25A High Current Low Dropout |
| LM3940S | 制造商:未知厂家 制造商全称:未知厂家 功能描述:1.25A High Current Low Dropout |
| LM3940T | 制造商:未知厂家 制造商全称:未知厂家 功能描述:1.25A High Current Low Dropout |
| LM3940WG-3.3-QML | 制造商:NSC 制造商全称:National Semiconductor 功能描述:1A Low Dropout Regulator for 5V to 3.3V Conversion |
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