电子技术-AMS1117.pdf
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1、Advanced Monolithic Systems,Inc.www.advanced- Phone(925)443-0722 Fax(925)443-0723 Advanced AMS1117 Monolithic 1A LOW DROPOUT VOLTAGE REGULATOR Systems RoHs Compliant FEATURES APPLICATIONS Three Terminal Adjustable or Fixed Voltages*High Efficiency Linear Regulators 1.5V,1.8V,2.5V,2.85V,3.3V and 5.0V
2、 Post Regulators for Switching Supplies Output Current of 1A 5V to 3.3V Linear Regulator Operates Down to 1V Dropout Battery Chargers Line Regulation:0.2%Max.Active SCSI Terminators Load Regulation:0.4%Max.Power Management for Notebook SOT-223,TO-252 and SO-8 package available Battery Powered Instru
3、mentation GENERAL DESCRIPTION The The AMS1117 series of adjustable and fixed voltage regulators are designed to provide 1A output current and to operate down to 1V input-to-output differential.The dropout voltage of the device is guaranteed maximum 1.3V at maximum output current,decreasing at lower
4、load currents.On-chip trimming adjusts the reference voltage to 1.5%.Current limit is also trimmed,minimizing the stress under overload conditions on both the regulator and power source circuitry.The AMS1117 devices are pin compatible with other three-terminal SCSI regulators and are offered in the
5、low profile surface mount SOT-223 package,in the 8L SOIC package and in the TO-252(DPAK)plastic package.ORDERING INFORMATION:PACKAGE TYPE OPERATING JUNCTION TO-252 SOT-223 8L SOIC TEMPERATURE RANGE AMS1117CD AMS1117 AMS1117CS-40 to 125 C AMS1117CD-1.5 AMS1117-1.5 AMS1117CS-1.5-40 to 125 C AMS1117CD-
6、1.8 AMS1117-1.8 AMS1117CS-1.8-40 to 125 C AMS1117CD-2.5 AMS1117-2.5 AMS1117CS-2.5-40 to 125 C AMS1117CD-2.85 AMS1117-2.85 AMS1117CS-2.85-40 to 125 C AMS1117CD-3.3 AMS1117-3.3 AMS1117CS-3.3-40 to 125 C AMS1117CD-5.0 AMS1117-5.0 AMS1117CS-5.0-40 to 125 C*For additional available fixed voltages contact
7、 factory.PIN CONNECTIONS 3 PIN FIXED/ADJUSTABLE VERSION 1-Ground/Adjust 2-VOUT 3-VIN SOT-223 Top View 123 8L SOIC Top View 12843756VOUTN/CVOUTGND/ADJVOUTVOUTN/CVIN TAB ISOUTPUTTO-252 FRONT VIEW123 Advanced Monolithic Systems,Inc.www.advanced- Phone(925)443-0722 Fax(925)443-0723 AMS1117 ABSOLUTE MAXI
8、MUM RATINGS(Note 1)Power Dissipation Internally limited Soldering information Input Voltage 15V Lead Temperature(25 sec)265C Operating Junction Temperature Range Thermal Resistance Control Section-40C to 125C SO-8 package JA=160C/W Power Transistor -40C to 125C TO-252 package JA=80C/W Storage temper
9、ature-65C to +150C SOT-223 package JA=90C/W*With package soldering to copper area over backside ground plane or internal power plane JA can vary from 46C/W to 90C/W depending on mounting technique and the size of the copper area.ELECTRICAL CHARACTERISTICS Electrical Characteristics at IOUT=0 mA,and
10、TJ=+25C unless otherwise specified.Parameter Device Conditions Min Typ Max Units Reference Voltage(Note 2)AMS1117 IOUT=10 mA 1.5V(VIN-VOUT)12V 1.232 1.2125 1.250 1.250 1.268 1.2875 V V Output Voltage (Note 2)AMS1117-1.5 3.0V VIN 12V 1.478 1.455 1.500 1.500 1.522 1.545 V V AMS1117-1.8 3.3V VIN 12V 1.
11、773 1.746 1.800 1.800 1.827 1.854 V V AMS1117-2.5 4.0V VIN 12V 2.463 2.425 2.500 2.500 2.537 2.575 V V AMS1117-2.85 4.35V VIN 12V 2.808 2.7645 2.850 2.850 2.892 2.9355 V V AMS1117-3.3 4.75V VIN 12V 3.251 3.201 3.300 3.300 3.349 3.399 V V AMS1117-5.0 6.5V VIN 12V 4.925 4.850 5.000 5.000 5.075 5.150 V
12、 V Line Regulation AMS1117 1.5V(VIN-VOUT)12V 0.015 0.035 0.2 0.2%AMS1117-1.5 3.0V VIN 12V 0.3 0.6 5 6 mV mV AMS1117-1.8 3.3V VIN 12V 0.3 0.6 5 6 mV mV AMS1117-2.5 4.0V VIN 12V 0.3 0.6 6 6 mV mV AMS1117-2.85 4.35V VIN 12V 0.3 0.6 6 6 mV mV AMS1117-3.3 4.75V VIN 12V 0.5 1.0 10 10 mV mV AMS1117-5.0 6.5
13、V VIN 12V 0.5 1.0 10 10 mV mV Load Regulation(Notes 2,3)AMS1117(VIN-VOUT)=1.5V,10mA IOUT 1A 0.1 0.2 0.3 0.4%AMS1117-1.5 VIN=3V,0 IOUT 1A 3 6 10 20 mV mV AMS1117-1.8 VIN=3.3V,0 IOUT 1A 3 6 10 20 mV mV AMS1117-2.5 VIN=5V,0 IOUT 1A 3 6 12 20 mV mV Advanced Monolithic Systems,Inc.www.advanced- Phone(925
14、)443-0722 Fax(925)443-0723 AMS1117 ELECTRICAL CHARACTERISTICS Electrical Characteristics at IOUT=0 mA,and TJ=+25C unless otherwise specified.Parameter Device Conditions Min Typ Max Units Load Regulation(Notes 2,3)AMS1117-2.85 VIN=4.35V,0 IOUT 1A 3 6 12 20 mV mV AMS1117-3.3 VIN=4.75V,0 IOUT 1A 3 7 15
15、 25 mV mV AMS1117-5.0 VIN=6.5V,0 IOUT 1A 5 10 20 35 mV mV Dropout Voltage(VIN-VOUT)AMS1117-1.5/-1.8/-2.5/-2.85/-3.3/-5.0 VOUT,VREF=1%,IOUT=1A(Note 4)1.1 1.3 V Current Limit AMS1117-1.5/-1.8/-2.5/-2.85/-3.3/-5.0(VIN-VOUT)=1.5V 900 1,100 1,500 mA Minimum Load Current AMS1117(VIN-VOUT)=1.5V (Note 5)5 1
16、0 mA Quiescent Current AMS1117-1.5/-1.8/-2.5/-2.85/-3.3/-5.0(VIN-VOUT)=1.5V 5 11 mA Ripple Rejection AMS1117 f=120Hz,COUT=22F Tantalum,IOUT=1A,(VIN-VOUT)=3V,CADJ=10F 60 75 dB AMS1117-1.5/-1.8/-2.5/-2.85 f=120Hz,COUT=22F Tantalum,IOUT=1A,VIN =4.35V 60 72 dB AMS1117-3.3 f=120Hz,COUT=22F Tantalum,IOUT=
17、1A VIN =4.75V 60 72 dB AMS1117-5.0 f=120Hz,COUT=22F Tantalum,IOUT=1A VIN =6.5V 60 68 dB Thermal Regulation AMS1117 TA=25C,30ms pulse 0.008 0.04%W Adjust Pin Current AMS1117 IOUT=10mA,1.5V(VIN-VOUT)12V 55 120 A A Adjust Pin Current Change AMS1117 IOUT=10mA,1.5V(VIN-VOUT)12V 0.2 5 A Temperature Stabil
18、ity 0.5%Long Term Stability TA=125C,1000Hrs 0.3 1%RMS Output Noise(%of VOUT)TA=25C,10Hz f 10kHz 0.003%Thermal Resistance Junction-to-Case All packages 15 C/W Parameters identified with boldface type apply over the full operating temperature range.Note 1:Absolute Maximum Ratings indicate limits beyon
19、d which damage to the device may occur.For guaranteed specifications and test conditions,see the Electrical Characteristics.The guaranteed specifications apply only for the test conditions listed.Note 2:Line and Load regulation are guaranteed up to the maximum power dissipation of 1.2 W for SOT-223,
20、2.2W for TO-252 and 780mW for 8-Lead SOIC.Power dissipation is determined by the input/output differential and the output current.Guaranteed maximum power dissipation will not be available over the full input/output range.Note 3:See thermal regulation specifications for changes in output voltage due
21、 to heating effects.Line and load regulation are measured at a constant junction temperature by low duty cycle pulse testing.Load regulation is measured at the output lead 1/8”from the package.Note 4:Dropout voltage is specified over the full output current range of the device.Note 5:Minimum load cu
22、rrent is defined as the minimum output current required to maintain regulation.When 1.5V (VIN-VOUT)12V the device is guaranteed to regulate if the output current is greater than 10mA.Advanced Monolithic Systems,Inc.www.advanced- Phone(925)443-0722 Fax(925)443-0723 AMS1117 APPLICATION HINTS The AMS11
23、17 series of adjustable and fixed regulators are easy to use and are protected against short circuit and thermal overloads.Thermal protection circuitry will shut-down the regulator should the junction temperature exceed 165C at the sense point.Pin compatible with older three terminal adjustable regu
24、lators,these devices offer the advantage of a lower dropout voltage,more precise reference tolerance and improved reference stability with temperature.Stability The circuit design used in the AMS1117 series requires the use of an output capacitor as part of the device frequency compensation.The addi
25、tion of 22F solid tantalum on the output will ensure stability for all operating conditions.When the adjustment terminal is bypassed with a capacitor to improve the ripple rejection,the requirement for an output capacitor increases.The value of 22F tantalum covers all cases of bypassing the adjustme
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