lm1117有几个管脚? 芯片LM1117的功能
本文主要是关于lm1117的相关介绍，并着重对lm1117的管脚及其功能进行了详尽的阐述。
LM1117概述
LM1117提供电流限制和热保护。电路包含1个齐纳调节的带隙参考电压以确保输出电压的精度在±1%以内。LM1117系列具有LLP、TO-263、SOT-223、TO-220和TO-252 D-PAK封装。输出端需要一个至少10uF的钽电容来改善瞬态响应和稳定性。
替换型号
X1117是IC网络超市自主的品牌，可以很好的替换LM1117。
X1117是一款正电压输出的低压降三端线性稳压电路，在1A输出电流下的压降为1.2V。分为两个版本，固定电压输出版本和可调电压输出版本。固定输出电压1.5V、1.8V、2.5V、3.3V、5.0V和可调版本的电压精度为1%；固定电压为1.2V的产品输出电压精度为2%。内部集成过热保护和限流电路，适用于各类电子产品。
A1117是台湾亿光研发生产的高效率低压降三端线性稳压器，A1117提供电流限制和热保护，以确保芯片和功率稳定性系统。而在芯片上保证输出电压精度在±2%。同时也提供了固定电压输出版本和可调电压输出版本，可调版本能输出从1.25V到13.8V。
其他
特性
提供1.8V、2.5V、2.85V、3.3V、5V和可调电压的型号
节省空间的SOT-223和LLP封装
电流限制和热保护功能
输出电流可达800mA
线性调整率：0.2% （Max）
负载调整率：0.4% （Max）
温度范围
1A LOWDROP OUT VOLTAGE REGULATOR (ADJUSTABLE & FIXED) LM1117FEATURES● Output Current up to 1 A● Low Dropout Voltage ( 700mV at 1A Output Current )● Three Terminal Adjustable or Fixed 1.5V, 1.8V, 2.5V, 2.85V, 3.0V, 3.3V, 5.0V● 2.85V Device for SCSI-II Active Terminator● 0.04% Line Regulaion, 0.1% Load Regulation● Very Low Quiescent Current● Internal Current andTerminal Limit● Logic-Controlled Electronics Shutdown● Surface Mount Package SOT-223 & TO-263 (D2-Pack)● 100% Thermal Limit Burn-InAPPLICATION● Active SCSI Terminators● Portable/Plan Top/Notebook Computers● High Efficiency Linear Regulators● SMPS Post RegulatorsORDERING INFORMATION● Mother B/D Clock Supplies Package● Disk Drives● Battery ChargersDESCRIPTION(X=Output Voltage=1.5V, 1.8V, 2.5V, 2.85V, '3.0V, 3.3V, 5.0V, Adjustable=AD)The LM1117 is a low power positive-voltage regulator designed to meet 1A output current and complywith SCSI-II specifications with a fixed output voltage of 2.85V. This device is an excellent choice for usein battery-powered applications, as active terminators for the SCSI bus, and portable computers.The LM1117 features very low quiescent current and very low dropout voltage of 700mV at a full load andlower as output current decreases. LM1117 is available as an adjustable or fixed 1.5V, 1.8V, 2.5V, 2.85V, 3.0V, 3.3V, and 5.0V output voltages.The LM1117 is offered in a 3-pin surface mount package SOT-223 & TO-263. The output capacitor of10㎌ or larger is needed for output stability of LM1117 as required by most of the other regulator circuits.ABSOLUTE MAXIMUM RATINGS
1A L.D.O. VOLTAGE REGULATOR LM1117S/RS/F
FEATURES● Output Current up to 1 A● Low Dropout Voltage ( 1.2V at 1A Output Current )● Three Terminal Adjustable(ADJ) or Fixed 1.2V,1.5V, 1.8V, 2.5V, 2.85V, 3.3V, 5.0V● Line Regulaion typically at 0.1% max● Load Regulaion typically at 0.2% max● Internal Current and Terminal Protection● Maximum Input Voltage - 15V● Surface Mount Package SOT-223, TO-252, SOT-89● 100% Thermal Limit Burn-In
APPLICATIONORDERING INFORMATION● Active SCSI Terminators● Portable/Plan Top/Notebook Computers● High Efficiency Linear Regulators
● SMPS Post Regulators
● Mother B/D Clock Supplies● Disk Drives● Battery Chargers( X.X=Output Voltage=1.2V,1.5V, 1.8V, 2.5V,
'3.3V, 5.0V, Adjustable=ADJ)
DESCRIPTION
The LM1117 is a low power positive-voltage regulator designed to meet 1A output current and comply
LM1117/LM1117I
800mALow-DropoutLinearRegulator
GeneralDescription
TheLM1117isaseriesoflowdropoutvoltageregulators
withadropoutof1.2Vat800mAofloadcurrent.Ithasthe
samepin-outasNationalSemiconductor’sindustrystandard
LM317.
TheLM1117isavailableinanadjustableversion,whichcan
settheoutputvoltagefrom1.25Vto13.8Vwithonlytwo
externalresistors.Inaddition,itisalsoavailableinfivefixed
voltages,1.8V,2.5V,2.85V,3.3V,and5V.
TheLM1117offerscurrentlimitingandthermalshutdown.Its
circuitincludesazenertrimmedbandgapreferencetoas-
sureoutputvoltageaccuracytowithin±1%.
TheLM1117seriesisavailableinLLP,TO-263,SOT-223,
TO-220,andTO-252D-PAKpackages.Aminimumof10µF
tantalumcapacitorisrequiredattheoutputtoimprovethe
transientresponseandstability.Features
nAvailablein1.8V,2.5V,2.85V,3.3V,5V,andAdjustable
Versions
nSpaceSavingSOT-223andLLPPackages
