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  • 北京元坤伟业科技有限公司

         该会员已使用本站17年以上

  • LP3963ES-1.8
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  • 深圳市宏捷佳电子科技有限公司

     该会员已使用本站12年以上
  • LP3963ES-1.8 现货库存
  • 数量60030 
  • 厂家NATIONAL 
  • 封装TO223 
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  • 深圳市顺兴源微电子商行

     该会员已使用本站7年以上
  • LP3963ES-1.8 现货库存
  • 数量9000000 
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  • 深圳市芯福林电子有限公司

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  • LP3963ES-1.8
  • 数量65000 
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  • 深圳市得捷芯城科技有限公司

     该会员已使用本站11年以上
  • LP3963ES-1.8
  • 数量2580 
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  • 集好芯城

     该会员已使用本站13年以上
  • LP3963ES-1.8
  • 数量16934 
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  • 深圳市拓亿芯电子有限公司

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  • 数量55000 
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  • LP3963ES-1.8
  • 数量5369 
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  • 深圳市宏捷佳电子科技有限公司

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  • LP3963ES-1.8
  • 数量12300 
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  • 深圳市惊羽科技有限公司

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  • LP3963ES-1.8
  • 数量18800 
  • 厂家TI-德州仪器 
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  • 深圳市晶美隆科技有限公司

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  • LP3963ES-1.8
  • 数量15372 
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  • 深圳市宏捷佳电子科技有限公司

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  • LP3963ES-1.8
  • 数量12300 
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  • 封装TO223 
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  • 深圳市华斯顿电子科技有限公司

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  • LP3963ES-1.8
  • 数量28750 
  • 厂家NS 
  • 封装TO263 
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  • 深圳市硅诺电子科技有限公司

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  • LP3963ES-1.8
  • 数量34577 
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  • 封装TO263 
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  • 深圳市宏世佳电子科技有限公司

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  • 数量3625 
  • 厂家TI 
  • 封装TO-263-6,D?Pak(5 引线 + 接片),TO-263BA 
  • 批号2023+ 
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  • 深圳市富科达科技有限公司

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  • 数量99000 
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  • 封装TO-263 
  • 批号23+ 
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  • 深圳市宏世佳电子科技有限公司

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  • LP3963ES-1.8
  • 数量5425 
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  • 深圳市宗天技术开发有限公司

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  • LP3963ES-1.8
  • 数量1200 
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  • 上海意淼电子科技有限公司

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  • LP3963ES-1.8
  • 数量20000 
  • 厂家NS 
  • 封装原厂封装 
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  • 原装现货热卖!请联系吴先生 13681678667
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  • 上海金庆电子技术有限公司

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  • LP3963ES-1.8
  • 数量168 
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  • 深圳市浩兴林电子有限公司

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  • LP3963ES-1.8
  • 数量5000 
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  • 深圳市芯柏然科技有限公司

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  • LP3963ES-1.8/NOPB
  • 数量23480 
  • 厂家TI 
  • 封装TO-263-5 
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  • 新到现货、一手货源、当天发货、价格低于市场
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  • 上海振基实业有限公司

     该会员已使用本站13年以上
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  • 数量989 
  • 厂家NS 
  • 封装TO-263 
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  • 万三科技(深圳)有限公司

     该会员已使用本站2年以上
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  • 数量660000 
  • 厂家Texas Instruments 
  • 封装原厂原装 
  • 批号23+ 
  • 支持实单/只做原装
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  • 深圳市诚达吉电子有限公司

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  • LP3963ES-1.8
  • 数量8477 
  • 厂家NS 
  • 封装TO-263 
  • 批号2024+ 
  • 原装正品 一手现货 假一赔百
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  • 深圳市特拉特科技有限公司

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  • LP3963ES-1.8
  • 数量18000 
  • 厂家NS原装正品 
  • 封装TO-263 
  • 批号新年份 
  • 原装正品,品质保证,值得你信赖
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  • 万三科技(深圳)有限公司

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  • 数量6500000 
  • 厂家Texas Instruments 
  • 封装原厂原装 
  • 批号22+ 
  • 万三科技 秉承原装 实单可议
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  • 深圳市赛科世纪电子有限公司

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  • LP3963ES-1.8
  • 数量76364 
  • 厂家National 
  • 封装TO263-5L 
  • 批号22+ 
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  • 上海磐岳电子有限公司

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  • LP3963ES-1.8
  • 数量5800 
  • 厂家NS 
  • 封装TO263-5 
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  • 深圳市欧瑞芯科技有限公司

     该会员已使用本站11年以上
  • LP3963ES-1.8/NOPB
  • 数量10000 
  • 厂家TI(德州仪器) 
  • 封装TO-263-6,D2Pak(5 引线 + 接片),TO-263BA 
  • 批号23+/24+ 
  • 绝对原装正品,可开13%专票,欢迎采购!!!
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  • 深圳市瑞天芯科技有限公司

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  • LP3963ES-1.8
  • 数量20000 
  • 厂家NS 
  • 封装TO-263 
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  • 深圳市楚胜电子有限公司

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  • LP3963ES-1.8
  • 数量22358 
  • 厂家NS 
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  • 深圳市创思克科技有限公司

     该会员已使用本站2年以上
  • LP3963ES-1.8/NOPB
  • 数量6680 
  • 厂家TI/德州仪器 
  • 封装TO-263-5 
  • 批号20+ 
  • 全新原装挺实单欢迎来撩/可开票
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  • 数量15000 
  • 厂家原厂品牌 
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  • 批号 
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产品型号LP3963ES-1.8的概述

芯片LP3963ES-1.8的概述 LP3963ES-1.8是一款高效、低压的线性稳压器,专为提供稳定电压给各种电子设备而设计。这款芯片的输出电压为1.8V,适合于需要低电压供电的应用场合,如便携式设备、传感器、微控制器和其他需要电源管理的模块。LP3963ES-1.8具有良好的负载瞬态响应和低静态电流,确保在多种负载条件下还能保持稳定的输出。 芯片的详细参数 LP3963ES-1.8的关键技术参数包括: - 输入电压范围:2.5V至6V - 输出电压:1.8V(固定输出) - 输出电流能力:最多可提供200mA的输出电流 - 静态电流:在不负载情况下,静态电流约为20μA - 压差:最小1V,适合低于6V的输入电压 - 工作温度范围:-40°C至+125°C - 噪声性能:相对较低的电压噪声,通常小于30μV(单位带宽) 这些参数显示了LP3963ES-1.8在高效能和稳定性方面的特...

产品型号LP3963ES-1.8的Datasheet PDF文件预览

April 2000  
LP3963/LP3966  
3A Fast Ultra Low Dropout Linear Regulators  
General Description  
Features  
n Ultra low dropout voltage  
The LP3963/LP3966 series of fast ultra low-dropout linear  
regulators operate from a +2.5V to +7.0V input supply. Wide  
range of preset output voltage options are available. These  
ultra low dropout linear regulators respond very fast to step  
changes in load which makes them suitable for low voltage  
microprocessor applications. The LP3963/LP3966 are de-  
veloped on a CMOS process which allows low quiescent  
current operation independent of output load current.This  
CMOS process also allows the LP3963/LP3966 to operate  
under extremely low dropout conditions.  
n Low ground pin current  
n Load regulation of 0.06%  
n 15µA quiescent current in shutdown mode  
n Guaranteed output current of 3A DC  
n Available in TO-263 and TO-220 packages  
n Output voltage accuracy 1.5%  
n Error flag indicates output status (LP3963)  
n Sense option improves better load regulation (LP3966)  
n Extremely low output capacitor requirements  
n Overtemperature/overcurrent protection  
±
Dropout Voltage: Ultra low dropout voltage; typically 80mV  
at 300mA load current and 800mV at 3A load current.  
n −40˚C to +125˚C junction temperature range  
Ground Pin Current: Typically 6mA at 3A load current.  
Shutdown Mode: Typically 15µA quiescent current when  
the shutdown pin is pulled low.  
Applications  
n Microprocessor power supplies  
n GTL, GTL+, BTL, and SSTL bus terminators  
n Power supplies for DSPs  
n SCSI terminator  
Error Flag: Error flag goes low when the output voltage  
drops 10% below nominal value (for LP3963).  
SENSE: Sense pin improves regulation at remote loads.  
(For LP3966)  
n Post regulators  
Precision Output Voltage: Multiple output voltage options  
n High efficiency linear regulators  
n Battery chargers  
are available ranging from 1.2V to 5.0V and adjustable, with  
±
a guaranteed accuracy of 1.5% at room temperature, and  
±
3.0% over all conditions ( varying line, load, and tempera-  
n Other battery powered applications  
ture).  
Typical Application Circuits  
DS101267-1  
# Minimum output capacitance is 10 µF to ensure stability over full load current range. More capacitance provides superior dynamic performance and additional  
stability margin.  
*SD and ERROR pins must be pulled high through a 10kpull-up resistor. Connect the ERROR pin to ground if this function is not used. See applications sec-  
tion for more information.  
© 2000 National Semiconductor Corporation  
DS101267  
www.national.com  
Typical Application Circuits (Continued)  
DS101267-34  
# Minimum output capacitance is 10 µF to ensure stability over full load current range. More capacitance provides superior dynamic performance and additional sta-  
bility margin.  
*SD and ERROR pins must be pulled high through a 10kpull-up resistor. Connect the ERROR pin to ground if this function is not used. See applications section  
for more information.  
Block Diagram LP3963  
DS101267-3  
www.national.com  
2
Block Diagram LP3966  
DS101267-29  
Block Diagram LP3966-ADJ  
DS101267-35  
Connection Diagrams  
DS101267-5  
Top View  
TO220-5 Package  
Bent, Staggered Leads  
3
www.national.com  
Connection Diagrams (Continued)  
DS101267-6  
Top View  
TO263-5 Package  
Pin Description for TO220-5 and TO263-5 Packages  
LP3963  
LP3966  
#
Pin  
Name  
SD  
Function  
Shutdown  
Name  
SD  
Function  
Shutdown  
1
2
3
4
5
VIN  
Input Supply  
Ground  
VIN  
Input Supply  
Ground  
GND  
VOUT  
ERROR  
GND  
Output Voltage  
ERROR Flag  
VOUT  
Output Voltage  
SENSE/ADJ  
Remote Sense  
Pin/Output Adjust  
Pin  
Ordering Information  
DS101267-31  
Package Type Designator is Tfor TO220 package, and Sfor TO263 package.  
www.national.com  
4
Ordering Information (Continued)  
TABLE 1. Package Marking and Ordering Information  
Output  
Voltage  
5.0  
Order Number  
LP3963ES-5.0  
Description  
Package  
Type  
Package Marking  
Supplied As:  
Rail  
(Current, Option)  
3A, Error Flag  
TO263-5  
LP3963ES-5.0  
LP3963ESX-5.0  
LP3963ES-3.3  
LP3963ES-3.3  
LP3963ES-2.5  
LP3963ES-2.5  
LP3963ES-1.8  
LP3963ES-1.8  
LP3966ES-5.0  
LP3966ESX-5.0  
LP3966ES-3.3  
LP3966ES-3.3  
LP3966ES-2.5  
LP3966ES-2.5  
LP3966ES-1.8  
LP3966ES-1.8  
LP3966ES-ADJ  
LP3966ES-ADJ  
LP3963ET-5.0  
LP3963ET-3.3  
LP3963ET-2.5  
LP3963ET-1.8  
LP3966ET-5.0  
LP3966ET-3.3  
LP3966ET-2.5  
LP3966ET-1.8  
LP3966ET-ADJ  
5.0  
LP3963ESX-5.0  
LP3963ES-3.3  
LP3963ESX-3.3  
LP3963ES-2.5  
LP3963ESX-2.5  
LP3963ES-1.8  
LP3963ESX-1.8  
LP3966ES-5.0  
LP3966ESX-5.0  
LP3966ES-3.3  
LP3966ESX-3.3  
LP3966ES-2.5  
LP3966ESX-2.5  
LP3966ES-1.8  
LP3966ESX-1.8  
LP3966ES-ADJ  
LP3966ESX-ADJ  
LP3963ET-5.0  
LP3963ET-3.3  
LP3963ET-2.5  
LP3963ET-1.8  
LP3966ET-5.0  
LP3966ET-3.3  
LP3966ET-2.5  
LP3966ET-1.8  
LP3966ET-ADJ  
3A, Error Flag  
3A, Error Flag  
3A, Error Flag  
3A, Error Flag  
3A, Error Flag  
3A, Error Flag  
3A, Error Flag  
3A, SENSE  
3A, SENSE  
3A, SENSE  
3A, SENSE  
3A, SENSE  
3A, SENSE  
3A, SENSE  
3A, SENSE  
3A, ADJ  
TO263-5  
TO263-5  
TO263-5  
TO263-5  
TO263-5  
TO263-5  
TO263-5  
TO263-5  
TO263-5  
TO263-5  
TO263-5  
TO263-5  
TO263-5  
TO263-5  
TO263-5  
TO263-5  
TO263-5  
TO220-5  
TO220-5  
TO220-5  
TO220-5  
TO220-5  
TO220-5  
TO220-5  
TO220-5  
TO220-5  
Tape and Reel  
3.3  
Rail  
3.3  
Tape and Reel  
2.5  
Rail  
2.5  
Tape and Reel  
1.8  
Rail  
1.8  
Tape and Reel  
5.0  
Rail  
5.0  
Tape and Reel  
3.3  
Rail  
3.3  
Tape and Reel  
2.5  
Rail  
2.5  
Tape and Reel  
1.8  
Rail  
1.8  
Tape and Reel  
ADJ  
ADJ  
5.0  
Rail  
3A, ADJ  
Tape and Reel  
3A, Error Flag  
3A, Error Flag  
3A, Error Flag  
3A, Error Flag  
3A, SENSE  
3A, SENSE  
3A, SENSE  
3A, SENSE  
3A, ADJ  
Rail  
Rail  
Rail  
Rail  
Rail  
Rail  
Rail  
Rail  
Rail  
3.3  
2.5  
1.8  
5.0  
3.3  
2.5  
1.8  
ADJ  
5
www.national.com  
Absolute Maximum Ratings (Note 1)  
If Military/Aerospace specified devices are required,  
please contact the National Semiconductor Sales Office/  
Distributors for availability and specifications.  
IOUT (Survival)  
Short Circuit Protected  
VIN+0.3V  
Maximum Voltage for ERROR Pin  
Maximum Voltage for SENSE Pin  
VOUT+0.3V  
Operating Ratings  
Storage Temperature Range  
Lead Temperature  
−65˚C to +150˚C  
Input Supply Voltage (Operating)  
2.5V to 7.0V  
(Soldering, 5 sec.)  
260˚C  
2 kV  
Shutdown Input Voltage  
(Operating)  
ESD Rating (Note 3)  
−0.3V to VIN+0.3V  
Power Dissipation (Note 2)  
Input Supply Voltage (Survival)  
Shutdown Input Voltage (Survival)  
Internally Limited  
−0.3V to +7.5V  
−0.3V to VIN+0.3V  
Maximum Operating Current  
(DC)  
3A  
Operating Junction Temp. Range  
−40˚C to +125˚C  
Output Voltage (Survival), (Note  
6), (Note 7)  
−0.3V to +7.5V  
Electrical Characteristics  
LP3963/LP3966  
Limits in standard typeface are for TJ = 25˚C, and limits in boldface type apply over the full operating temperature  
range. Unless otherwise specified: VIN = VO(NOM) + 1.5V, IL = 10 mA, COUT =10µF, VSD = VIN-0.3V.  
Symbol  
Parameter  
Conditions  
Typ(Note  
LP3963/6 (Note 5)  
Units  
4)  
Min  
Max  
<
<
Output Voltage  
Tolerance  
(Note 8)  
VOUT +1.5V VIN  
7.0V  
-1.5  
-3.0  
+1.5  
+3.0  
VO  
0
%
%
%
< <  
10 mA IL 3A  
<
<
V OL  
Output Voltage Line  
Regulation (Note 8)  
VOUT +1.5V VIN  
7.0V,  
0.02  
0.06  
<
<
VO/  
IOUT  
Output Voltage Load  
Regulation  
10 mA IL 3A  
0.06  
0.01  
(Note 8)  
VIN  
VOUT  
-
IL = 300 mA  
IL = 3A  
80  
800  
5
100  
120  
Dropout Voltage  
(Note 10)  
mV  
1000  
1200  
IL = 300 mA  
IL = 3A  
9
10  
Ground Pin Current In  
Normal Operation  
Mode  
IGND  
mA  
µA  
6
14  
15  
IGND  
Ground Pin Current In  
Shutdown Mode  
(Note 11)  
VSD 0.2V  
15  
25  
75  
IO(PK)  
Peak Output Current  
(Note 2)  
4.5  
5.5  
4
3.5  
A
A
SHORT CIRCUIT PROTECTION  
ISC Short Circuit Current  
OVER TEMPERATURE PROTECTION  
Tsh(t)  
Shutdown Threshold  
165  
10  
˚C  
˚C  
Tsh(h)  
Thermal Shutdown  
Hysteresis  
SHUTDOWN INPUT  
Output = High  
Output = Low  
IL = 3A  
VIN  
0
VIN–0.3  
VSDT  
Shutdown Threshold  
V
0.2  
TdOFF  
TdON  
ISD  
Turn-off delay  
Turn-on delay  
SD Input Current  
Threshold  
20  
25  
1
µs  
µs  
nA  
%
IL = 3A  
VSD = VIN  
(Note 9)  
VT  
10  
5
5
2
16  
8
VTH  
Threshold Hysteresis  
(Note 9)  
%
www.national.com  
6
Electrical Characteristics  
LP3963/LP3966 (Continued)  
Limits in standard typeface are for TJ = 25˚C, and limits in boldface type apply over the full operating temperature  
range. Unless otherwise specified: VIN = VO(NOM) + 1.5V, IL = 10 mA, COUT =10µF, VSD = VIN-0.3V.  
Symbol  
Parameter  
Conditions  
Typ(Note  
LP3963/6 (Note 5)  
Units  
4)  
Min  
Max  
SHUTDOWN INPUT  
VEF(Sat)  
Td  
Error Flag Saturation  
Flag Reset Delay  
Isink = 100µA  
0.02  
1
0.1  
V
µs  
nA  
Ilk  
Error Flag Pin Leakage  
Current  
1
Imax  
Error Flag Pin Sink  
Current  
VError = 0.5V  
1
mA  
AC PARAMETERS  
VIN = VOUT + 1.5V  
COUT = 100uF  
VOUT = 3.3V  
60  
40  
PSRR  
Ripple Rejection  
dB  
µV  
VIN = VOUT + 0.3V  
COUT = 100uF  
VOUT = 3.3V  
ρn(l/f  
Output Noise Density  
f = 120Hz  
0.8  
150  
100  
BW = 10Hz – 100kHz  
BW = 300Hz – 300kHz  
Output Noise Voltage  
(rms)  
µV  
(rms)  
en  
Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions for which the device is in-  
tended to be functional, but does not guarantee specific performance limits. For guaranteed specifications and test conditions, see Electrical Charateristics. The guar-  
anteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test  
conditions.  
Note 2: At elevated temperatures, devices must be derated based on package thermal resistance. The devices in TO220 package must be derated at θ = 50˚C/W  
jA  
2
(with 0.5in , 1oz. copper area), junction-to-ambient (with no heat sink). The devices in the TO263 surface-mount package must be derated at θ = 60˚C/W (with  
jA  
2
0.5in , 1oz. copper area), junction-to-ambient.  
Note 3: The human body model is a 100pF capacitor discharged through a 1.5kresistor into each pin.  
Note 4: Typical numbers are at 25˚C and represent the most likely parametric norm.  
Note 5: Limits are 100% production tested at 25˚C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control  
(SQC) methods. The limits are used to calculate National’s Average Outgoing Quality Level (AOQL).  
Note 6: If used in a dual-supply system where the regulator load is returned to a negative supply, the LP396X output must be diode-clamped to ground.  
Note 7: The output PMOS structure contains a diode between the V and V  
terminals. This diode is normally reverse biased. This diode will get forward biased  
OUT  
IN  
if the voltage at the output terminal is forced to be higher than the voltage at the input terminal. This diode can typically withstand 200mA of DC current and 1Amp  
of peak current.  
Note 8: Output voltage line regulation is defined as the change in output voltage from the nominal value due to change in the input line voltage. Output voltage load  
regulation is defined as the change in output voltage from the nominal value due to change in load current. The line and load regulation specification contains only  
the typical number. However, the limits for line and load regulation are included in the output voltage tolerance specification.  
Note 9: Error Flag threshold and hysteresis are specified as percentage of regulated output voltage.  
Note 10: Dropout voltage is defined as the minimum input to output differential voltage at which the output drops 2% below the nominal value. Dropout voltage speci-  
fication applies only to output voltages of 2.5V and above. For output voltages below 2.5V, the drop-out voltage is nothing but the input to output differential, since  
the minimum input voltage is 2.5V.  
Note 11: This specification has been tested for −40˚C T 85˚C since the temperature rise of the device is negligible under shutdown conditions.  
J
7
www.national.com  
Typical Performance Characteristics Unless otherwise specified, VIN = VO(NOM) + 1.5V, VOUT  
=
2.5V, COUT = 10µF, IOUT = 10mA, CIN = 10µF, VSD = VIN, and TA = 25˚C.  
Drop-Out Voltage Vs Temperature for Different Load  
Currents  
Drop-Out Voltage Vs Temperature for Different Output  
Voltages (IOUT = 800mA)  
DS101267-9  
DS101267-10  
Ground Pin Current Vs Input Voltage (VSD=VIN  
)
Ground Pin Current Vs Input Voltage (VSD=100mV)  
DS101267-11  
DS101267-15  
Ground Current Vs Temperature (VSD=VIN  
)
Ground Current Vs Temperature (VSD=0V  
DS101267-18  
DS101267-12  
www.national.com  
8
Typical Performance Characteristics Unless otherwise specified, VIN = VO(NOM) + 1.5V, VOUT  
=
2.5V, COUT = 10µF, IOUT = 10mA, CIN = 10µF, VSD = VIN, and TA = 25˚C. (Continued)  
Ground Pin Current Vs Shutdown Pin Voltage  
Input Voltage Vs Output Voltage  
DS101267-16  
DS101267-17  
Output Noise Density, VOUT= 2.5V  
Output Noise Density, VOUT= 5V  
DS101267-13  
DS101267-14  
9
www.national.com  
quency component and a high frequency component, which  
depend strongly on the silicon area and quiescent current.  
Noise can be reduced in two ways: by increasing the transis-  
tor area or by increasing the current drawn by the internal  
reference. Increasing the area will decrease the chance of  
fitting the die into a smaller package. Increasing the current  
drawn by the internal reference increases the total supply  
current (ground pin current). Using an optimized trade-off of  
ground pin current and die size, LP3963/LP3966 achieves  
low noise performance and low quiescent current operation.  
Applications Information  
Input Capacitor Selection  
The LP3963 and LP3966 require a minimum input capaci-  
tance of 10µF between the input and ground pins to prevent  
any impedance interactions with the supply. This capacitor  
should be located very close to the VIN pin. This capacitor  
can be of any type such as ceramic, tantalum, or low ESR  
aluminium. Any good quality capacitor which has good toler-  
ance over temperature and frequency is recommended.  
The total output noise specification for LP3963/LP3966 is  
presented in the Electrical Characteristics table. The Output  
noise density at different frequencies is represented by a  
curve under typical performance characteristics.  
Output Capacitor Selection  
The LP3963 and LP3966 require a minimum of 10µF capaci-  
tance between the output and ground pins for proper opera-  
tion. LP3963 and LP3966 work best with Tantalum or Elec-  
trolytic capacitor. The output capacitor should have a good  
tolerance over temperature, voltage, and frequency. Larger  
capacitance provides better improved load dynamics and  
noise performance. The output capacitor should be con-  
nected very close to the Vout pin.  
Short-Circuit Protection  
The LP3963and LP3966 is short circuit protected and in the  
event of a peak over-current condition, the short-circuit con-  
trol loop will rapidly drive the output PMOS pass element off.  
Once the power pass element shuts down, the control loop  
will rapidly cycle the output on and off until the average  
power dissipation causes the thermal shutdown circuit to re-  
spond to servo the on/off cycling to a lower frequency.  
Please refer to the section on thermal information for power  
dissipation calculations.  
Output Adjustment  
An adjustable output device has output voltage range of  
1.215V to 5.1V. To obtain a desired output voltage, the fol-  
lowing equation can be used with R1 always a 10kresistor.  
Error Flag Operation  
The LP3963/LP3966 produces a logic low signal at the Error  
Flag pin when the output drops out of regulation due to low  
input voltage, current limiting, or thermal limiting. This flag  
has a built in hysteresis. The timing diagram in Figure 1  
shows the relationship between the ERROR and the output  
voltage. In this example, the input voltage is changed to  
demonstrate the functionality of the Error Flag.  
For output stability, CF must be between 68pF and 100pF.  
Output Noise  
Noise is specified in two ways-  
Spot Noise or Output noise density is the RMS sum of all  
noise sources, measured at the regulator output, at a spe-  
cific frequency (measured with a 1Hz bandwidth). This type  
of noise is usually plotted on a curve as a function of fre-  
quency.  
The internal Error flag comparator has an open drain output  
stage. Hence, the ERROR pin should be pulled high through  
a pull up resistor. Although the ERROR pin can sink current  
of 1mA, this current is energy drain from the input supply.  
Hence, the value of the pull up resistor should be in the  
range of 10kto 1M. The ERROR pin must be con-  
nected to ground if this function is not used. It should  
also be noted that when the shutdown pin is pulled low, the  
ERROR pin is forced to be invalid for reasons of saving  
power in shutdown mode.  
Total output Noise or Broad-band noise is the RMS sum  
of spot noise over a specified bandwidth, usually several de-  
cades of frequencies.  
Attention should be paid to the units of measurement. Spot  
noise is measured in units µV/ Hz or nV/ Hz and total output  
noise is measured in µV(rms).  
The primary source of noise in low-dropout regulators is the  
internal reference. In CMOS regulators, noise has a low fre-  
www.national.com  
10  
Applications Information (Continued)  
DS101267-7  
FIGURE 1. Error Flag Operation  
Sense Pin  
tance. For example, in the case of a 3.3V output, if the trace  
resistance is 100m, the voltage at the remote load will be  
3V with 3A of load current, ILOAD. The LP3966 regulates the  
voltage at the sense pin. Connecting the sense pin to the re-  
mote load will provide regulation at the remote load, as  
shown in Figure 2. If the sense option pin is not required, the  
sense pin must be connected to the VOUT pin.  
In applications where the regulator output is not very close to  
the load, LP3966 can provide better remote load regulation  
using the SENSE pin. Figure 2 depicts the advantage of the  
SENSE option. LP3963 regulates the voltage at the output  
pin. Hence, the voltage at the remote load will be the regula-  
tor output voltage minus the drop across the trace resis-  
DS101267-8  
FIGURE 2. Improving remote load regulation using LP3966  
11  
www.national.com  
θHA≤ θJA θCH θJC  
.
Applications Information (Continued)  
In this equation, θCH is the thermal resistance from the junc-  
tion to the surface of the heat sink and θJC is the thermal re-  
sistance from the junction to the surface of the case. θJC is  
about 3˚C/W for a TO220 package. The value for θCH de-  
pends on method of attachment, insulator, etc. θCH varies  
between 1.5˚C/W to 2.5˚C/W. If the exact value is unknown,  
2˚C/W can be assumed.  
Shutdown Operation  
A CMOS Logic level signal at the shutdown ( SD) pin will  
turn-off the regulator. Pin SD must be actively terminated  
through a 10kpull-up resistor for a proper operation. If this  
pin is driven from a source that actively pulls high and low  
(such as a CMOS rail to rail comparator), the pull-up resistor  
is not required. This pin must be tied to Vin if not used.  
Heatsinking TO-263 Package  
Dropout Voltage  
The TO-263 package uses the copper plane on the PCB as  
a heatsink. The tab of these packages are soldered to the  
copper plane for heat sinking. Figure 3 shows a curve for the  
θJA of TO-263 package for different copper area sizes, using  
a typical PCB with 1 ounce copper and no solder mask over  
the copper area for heat sinking.  
The dropout voltage of a regulator is defined as the minimum  
input-to-output differential required to stay within 2% of the  
output voltage. The LP3963/LP3966 use an internal MOS-  
FET with an Rds(on) of 240m(typically). For CMOS LDOs,  
the dropout voltage is the product of the load current and the  
Rds(on) of the internal MOSFET.  
Reverse Current Path  
The internal MOSFET in LP3963and LP3966 has an inher-  
ent parasitic diode. During normal operation, the input volt-  
age is higher than the output voltage and the parasitic diode  
is reverse biased. However, if the output is pulled above the  
input in an application, then current flows from the output to  
the input as the parasitic diode gets forward biased. The out-  
put can be pulled above the input as long as the current in  
the parasitic diode is limited to 200mA continuous and 1A  
peak.  
Maximum Output Current Capability  
LP3963 and LP3966 can deliver a continuous current of 3A  
over the full operating temperature range. A heatsink may be  
required depending on the maximum power dissipation and  
maximum ambient temperature of the application. Under all  
possible conditions, the junction temperature must be within  
the range specified under operating conditions. The total  
power dissipation of the device is given by:  
DS101267-32  
FIGURE 3. θJA vs Copper(1 Ounce) Area for TO-263  
package  
As shown in the figure, increasing the copper area beyond 1  
square inch produces very little improvement. The minimum  
value for θJA for the TO-263 packag mounted to a PCB is  
32˚C/W.  
PD = (VIN−VOUT)IOUT+ (VIN)IGND  
where IGND is the operating ground current of the device  
(specified under Electrical Characteristics).  
Figure 4 shows the maximum allowable power dissipation  
for TO-263 packages for different ambient temperatures, as-  
suming θJA is 35˚C/W and the maximum junction tempera-  
ture is 125˚C.  
The maximum allowable temperature rise (TRmax) depends  
on the maximum ambient temperature (TAmax) of the appli-  
cation, and the maximum allowable junction temperature(TJ  
max):  
-
TRmax = TJmax− TAmax  
The maximum allowable value for junction to ambient Ther-  
mal Resistance, θJA, can be calculated using the formula:  
θJA = TRmax / PD  
LP3963 and LP3966 are available in TO-220 and TO-263  
packages. The thermal resistance depends on amount of  
copper area or heat sink, and on air flow. If the maximum al-  
lowable value of θJA calculated above is 60 ˚C/W for TO-  
220 package and 60 ˚C/W for TO-263 package no heatsink  
is needed since the package can dissipate enough heat to  
satisfy these requirements. If the value for allowable θJA falls  
below these limits, a heat sink is required.  
Heatsinking TO-220 Package  
DS101267-33  
The thermal resistance of a TO220 package can be reduced  
by attaching it to a heat sink or a copper plane on a PC  
board. If a copper plane is to be used, the values of θJA will  
be same as shown in next section for TO263 package.  
FIGURE 4. Maximum power dissipation vs ambient  
temperature for TO-263 package  
The heatsink to be used in the application should have a  
heatsink to ambient thermal resistance,  
www.national.com  
12  
Physical Dimensions inches (millimeters) unless otherwise noted  
TO220 5-lead, Molded, Stagger Bend Package (TO220-5)  
NS Package Number T05D  
For Order Numbers, refer to the “Ordering Information” section of this document.  
13  
www.national.com  
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)  
TO263 5-Lead, Molded, Surface Mount Package (TO263-5)  
NS Package Number TS5B  
For Order Numbers, refer to the “Ordering Information” section of this document.  
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NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT  
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL  
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:  
1. Life support devices or systems are devices or  
systems which, (a) are intended for surgical implant  
into the body, or (b) support or sustain life, and  
whose failure to perform when properly used in  
accordance with instructions for use provided in the  
labeling, can be reasonably expected to result in a  
significant injury to the user.  
2. A critical component is any component of a life  
support device or system whose failure to perform  
can be reasonably expected to cause the failure of  
the life support device or system, or to affect its  
safety or effectiveness.  
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配单直通车
LP3963ES-1.8产品参数
型号:LP3963ES-1.8
生命周期:Obsolete
零件包装代码:D2PAK
包装说明:TO-263,
针数:4
Reach Compliance Code:unknown
ECCN代码:EAR99
HTS代码:8542.39.00.01
风险等级:5.68
Is Samacsys:N
最大回动电压 1:0.7 V
最大输入电压:7 V
最小输入电压:2.5 V
JESD-30 代码:R-PSSO-G5
长度:10.16 mm
功能数量:1
端子数量:5
工作温度TJ-Max:125 °C
工作温度TJ-Min:-40 °C
最大输出电流 1:3 A
最大输出电压 1:1.854 V
最小输出电压 1:1.746 V
标称输出电压 1:1.8 V
封装主体材料:PLASTIC/EPOXY
封装代码:TO-263
封装形状:RECTANGULAR
封装形式:SMALL OUTLINE
调节器类型:FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR
座面最大高度:4.8 mm
表面贴装:YES
技术:CMOS
端子形式:GULL WING
端子节距:1.7 mm
端子位置:SINGLE
宽度:8.64 mm
Base Number Matches:1
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