AMS1117A-ADJ

AMS1117A 1A Bipolar Linear Regulator Features  Maximum output current is 1.4A  Standby current: 2mA (typ.)  Range of operation input voltage: Max 15V  Load regulation: 0.2%/A (typ.)  Line regulation: 0.03%/V (typ.)  Environment Temperature: -20℃~85℃ Power Management for Computer Mother  Board, Graphic Card  DVD Decode Board ADSL Modem LCD Monitor and LCD TV  Post Regulators For Switching Supplies Applications   General Description AMS1117A is a series of low dropout three-terminal two external resistors. regulators with a dropout of 1.3V at 1A load current. AMS1117A offers thermal shut down function, to assure the AMS1117A features a very low standby current 2mA stability of chip and power system. And it uses trimming compared to 5mA of competitor. technique to guarantee output voltage accuracy within Other than a fixed version, Vout = 1.2V, 1.8V, 2.5V, 2.85V， 2%. Other output voltage accuracy can be customized on 3.3V, and 5V, AMS1117A has an adjustable version, demand, such as which can provide an output voltage from 1.25 to 12V AMS1117A is available in SOT-223, TO-252 power package. 1%. with only Typical Application AMS1117A fgut V i n 10uF V o u t G n d 10uF Application circuit of AMS1117A fixed version Typical Electrical Characteristic AMS1117A-ADJ Ver1.5 1 Jul.01,2016 AMS1117A 1A Bipolar Linear Regulator Selection Table Marking Part No. Output Voltage XX=12 1.2V XX=18 1.8V 1117A XX=28 2.85V XX YYWW XX=25 2.5V XX=33 3.3V XX=50 5.0V XX=AD Adj Ordering Information Marking 1117A XX YYWW Package SOT-223 TO-252 Designator Description 1117A Product code XX Output Voltage(1.2~12.0V) YYWW DATE CODE Note:”XX” stands for output voltages. Other voltages can be specially customized Parameters Description Temperature & Rohs C:-40~85℃ ,Pb Free Rohs Std. Package type L:SOT-223 O:TO-252 Packing type: TR: Tape & Reel (Standard) Voltage accuracy 2%(Customized) Block Diagram Ver1.5 2 Jul.01,2016 AMS1117A 1A Bipolar Linear Regulator Pin Configuration Absolute Maximum Ratings Max Input Voltage ·········································································································18V Max Operating Junction Temperature(Tj) ···········································································150℃ Ambient Temperature(Ta) ·······························································································-40℃~ 85℃ Storage Temperature(Ts) ································································································ -40℃~150℃ Lead Temperature & Time·······························································································260℃ 10S Caution: Exceed these limits to damage to the device. Exposure to absolute maximum rating conditions may affect device reliability. Recommended Work Conditions Recommended maximum input voltage ··················································································· 15V Recommended operating junction temperature(Tj) ···································································· -20~125℃ Thermal Information Parameter Package Package thermal resistance Ver1.5 Rating Unit SOT-223 20 ℃/W TO-252 12.5 ℃/W 3 Jul.01,2016 AMS1117A 1A Bipolar Linear Regulator Electrical Characteristics TA=25℃, unless otherwise noted. Symbol Parameter Vref Reference voltage Conditions AMS1117A-Adj Min Typ Max Unit 1.225 1.25 1.275 V 1.176 1.2 1.224 V 1.764 1.8 1.836 V 2.45 2.5 2.55 V 2.793 2.85 2.907 V 3.234 3.3 3.366 V 4.9 5 5.1 V 0.03 0.2 %/V 0.03 0.2 %/V 0.03 0.2 %/V 0.03 0.2 %/V 0.03 0.2 %/V 0.03 0.2 %/V 0.03 0.2 %/V 2 8 mV 2 8 mV 3 12 mV 10mA≤Iout≤1A , Vin=3.25V AMS1117A-1.2V 0≤Iout≤1A , Vin=3.2V AMS1117A-1.8V 0≤Iout≤1A , Vin=3.8V AMS1117A-2.5V Vout Output voltage 0≤Iout≤1A , Vin=4.5V AMS1117A-2.85V 0≤Iout≤1A , Vin=4.85V AMS1117A-3.3V 0≤Iout≤1A , Vin=5.3V AMS1117A-5.0V 0≤Iout≤1A , Vin=7.0V AMS1117A-1.2V Iout=10mA, 2.7V≤Vin≤10V AMS1117A-ADJ Iout=10mA, 2.75V≤Vin≤12V AMS1117A-1.8V Iout=10mA, 3.3V≤Vin≤12V △Vout Line regulation AMS1117A-2.5V Iout=10mA, 4.0V≤Vin≤12V AMS1117A-2.85V Iout=10mA, 4.35V≤Vin≤12V AMS1117A-3.3V Iout=10mA, 4.8V≤Vin≤12V AMS1117A-5.0V Iout=10mA, 6.5V≤Vin≤12V AMS1117A-1.2V Vin =2.7V, 10mA≤Iout≤1A AMS1117A-ADJ Vin =2.75V, 10mA≤Iout≤1A AMS1117A-1.8V Vin =3.3V, 10mA≤Iout≤1A Ver1.5 4 Jul.01,2016 AMS1117A 1A Bipolar Linear Regulator △Vout Load 4 16 mV 5 20 mV 6 24 mV 9 36 mV Iout =100mA 1.15 1.3 V Iout=1A 1.3 1.5 V AMS1117A-ADJ 2 10 mA AMS1117A-1.2V,Vin=10V 2 5 mA AMS1117A-1.8V,Vin=12V 2 5 mA Quiescent AMS1117A-2.5V,Vin=12V 2 5 mA Current AMS1117A-2.85V,Vin=12V 2 5 mA AMS1117A-3.3V,Vin=12V 2 5 mA AMS1117A-5.0V,Vin=12V 2 5 mA AMS1117A-ADJ 55 120 uA 0.2 10 uA regulation AMS1117A-2.5V Vin =4.0V, 10mA≤Iout≤1A AMS1117A-2.85V Vin =4.35V, 10mA≤Iout≤1A AMS1117A-3.3 Vin =4.8V, 10mA≤Iout≤1A AMS1117A-5.0 Vin =6.5V, 10mA≤Iout≤1A Vdrop Imin Dropout voltage Minimum load current Iq IAdj Adjust pin current Ichange Iadj change Vin=5V,10mA≤Iout≤1A AMS1117A-ADJ Vin=5V,10mA≤Iout≤1A ΔV/ΔT ±100 Temperature ppm coefficien θJC Thermal SOT-223 20 resistance TO-252 10 ℃/W Note1: All test are conducted under ambient temperature 25°C and within a short period of time 20ms Note2: Load current smaller than minimum load current of AMS1117A-ADJ will lead to unstable or oscillationoutput. Ver1.5 5 Jul.01,2016 AMS1117A 1A Bipolar Linear Regulator Detailed Description AMS1117A is a series of low dropout voltage, three terminal regulators. Its application circuit is very simple: the fixed version only needs two capacitors and the adjustable version only needs two resistors and two capacitors to work. It is composed of some modules including start-up circuit, bias circuit, bandgap, thermal shutdown, power transistors and its driver circuit and so on. The thermal shut down modules can assure chip and its application system working safety when the junction temperature is larger than 140°C. The bandgap module provides stable reference voltage, whose temperature coefficient is compensated by careful design considerations. The temperature coefficient is under 100 ppm/°C. And the accuracy of output voltage is guaranteed by trimming technique. Typical Application AMS1117A has an adjustable version and six fixed versions (1.2V, 1.8V, 2.5V, 2.85V , 3. 3V and 5V)Fixed Output Voltage Version AMS1117A Application circuit of AMS1117A fixed version 1) Recommend using 10uF tan capacitor as bypass capacitor (C1) for all application circuit. 2) Recommend using 10uF tan capacitor to assure circuit stability. Adjustable Output Voltage Version AMS1117A-ADJ Application Circuit of AMS1117A-ADJ The output voltage of adjustable version follows the equation: Vout=1.25×(1+R2/R1)+IAdj×R2. We can ignore IAdj because IAdj (about 50uA) is much less than the current of R1 (about 2~10mA). 1) Ver1.5 To meet the minimum load current (>10mA) requirement, R1 is recommended to be 125ohm or lower. As 6 Jul.01,2016 AMS1117A 1A Bipolar Linear Regulator AMS1117A-ADJ can keep itself stable at load current about 2mA, R1 is not allowed to be higher than 625ohm. 2) Using a bypass capacitor (CADJ) between the ADJ pin and ground can improve ripple rejection. This bypass capacitor prevents ripple from being amplified as the output voltage is increased. The impedance of C ADJ should be less than R1 to prevent ripple from being amplified. As R1 is normally in the range of 100Ω~500Ω, the value of C ADJ should satisfy this equation: 1/(2π×fripple×CADJ)