AMS1117-3.3

A S1117 1A Bipolar Linear Regulator Features ⚫ Output current is 1A ⚫ Standby current: 2mA (typ.) ⚫ Range of operation input voltage: 15V ⚫ Load regulation: 0.2%/A (typ.) ⚫ Line regulation: 0.03%/V (typ.) ⚫ Environment Temperature: -20℃~85℃ ⚫ ⚫ DVD Decode Board ADSL Modem ⚫ Post Regulators for Switching Supplies Applications ⚫ ⚫ Power Management for Computer Mother Board, Graphic Card LCD Monitor and LCD TV General Description AMS1117 is a series of low dropout three-terminal only two external resistors. regulators with a dropout of 1.3V at 1A load current. AMS1117 offers thermal shut down function, to assure AMS1117 features a very low standby current the stability of chip and power system. And it uses 2mA compared to 5mA of competitor. trimming technique to guarantee output voltage accuracy Other than a fixed version, Vout = 1.2V, 1.5V, 1.8V, 2.5V, within 2.85V，3.3V, and 5V, AMS1117 has an adjustable 2%. Other output voltage accuracy can be customized on version,which can provide an output voltage from 1.25 to demand, such as 1%. 12V with AMS1117 is available in SOT-223, TO-252 power package. Typical Application Application circuit of AMS1117 fixed version Ver2.2 1 Nov.17.2020 A S1117 1A Bipolar Linear Regulator Typical Electrical Characteristic AMS1117-adj Selection Table Marking 1117 XX YYWW Ordering Information Marking 1117 XX YYWW Part No. Output Voltage XX=12 1.2V XX=15 1.5V XX=18 1.8V XX=28 2.85V XX=25 2.5V XX=33 3.3V XX=50 5.0V XX=ADJ Adj Package SOT-223 TO-252 Designator Description 1117 Product code XX Output Voltage(1.2~12.0V) YYWW DATE CODE Note:”XX” stands for output voltages. Other voltages can be specially customized Ver2.2 2 Nov.17.2020 A S1117 1A Bipolar Linear Regulator Block Diagram Pin Configuration SOT223 (Top View) 4 Mark 1 2 3 Table1: AMS1117 series (SOT223 PKG) PIN NO. PIN NAME FUNCTION 1 VSS/ADJ VSS/ADJ pin 2 VOUT Output voltage pin 3 VIN Input voltage pin 4 VOUT Output voltage pin TO252 (Top View) 2 Table2: AMS1117 series (TO252 PKG) Mark 1 Ver2.2 3 PIN NO. PIN NAME FUNCTION 1 VSS/ADJ VSS/ADJ pin 2 VOUT Output voltage pin 3 VIN Input voltage pin 3 Nov.17.2020 A S1117 1A Bipolar Linear Regulator Absolute Maximum Ratings Max Input Voltage ·········································································································18V Max Operating Junction Temperature(Tj) ···········································································150℃ Ambient Temperature(Ta) ·······························································································-20℃~ 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. Electrical Characteristics TA=25℃, unless otherwise noted. Symbol Parameter Vin Input voltage Vref Reference voltage Conditions AMS1117-Adj Min Typ Max Unit -- 15 18 V 1.225 1.25 1.275 V 1.176 1.2 1.224 V 1.47 1.5 1.53 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 4 19 mV 5 26 mV 5 24 mV 5 32 mV 10mA≤Iout≤1A , Vin=3.25V AMS1117-1.2V 0≤Iout≤1A , Vin=2.7V AMS1117-1.5V 0≤Iout≤1A , Vin=3.0V AMS1117-1.8V Vout Output voltage 0≤Iout≤1A , Vin=3.3V AMS1117-2.5V 0≤Iout≤1A , Vin=4.0V AMS1117-2.85V 0≤Iout≤1A , Vin=4.35V AMS1117-3.3V 0≤Iout≤1A , Vin=4.8V AMS1117-5.0V 0≤Iout≤1A , Vin=6.5V AMS1117-1.2V Iout=10mA, 2.7V≤Vin≤10V AMS1117-1.5V Iout=10mA, 3.0V≤Vin≤10V AMS1117-ADJ Iout=10mA, 2.75V≤Vin≤12V △Vout Line regulation Ver2.2 AMS1117-1.8V Iout=10mA, 3.3V≤Vin≤12V 4 Nov.17.2020 A S1117 1A Bipolar Linear Regulator 8 AMS1117-2.5V 41 mV Iout=10mA, 4.0V≤Vin≤12V AMS1117-2.85V 8 46 mV 9 49 mV 10 56 mV 3 8 mV 3 8 mV 4 8 mV 4 12 mV 5 16 mV 6 20 mV 7 24 mV 10 36 mV Iout =100mA 1.15 1.3 V Iout=1A 1.3 1.5 V AMS1117-ADJ 2 10 mA 5 mA Iout=10mA, 4.35V≤Vin≤12V AMS1117-3.3V Iout=10mA, 4.8V≤Vin≤12V AMS1117-5.0V Iout=10mA, 6.5V≤Vin≤12V AMS1117-1.2V Vin =2.7V, 10mA≤Iout≤1A AMS1117-1.5V Vin =3.0V, 10mA≤Iout≤1A AMS1117-ADJ Vin =2.75V, 10mA≤Iout≤1A △Vout Load regulation AMS1117-1.8V Vin =3.3V, 10mA≤Iout≤1A AMS1117-2.5V Vin =4.0V, 10mA≤Iout≤1A AMS1117-2.85V Vin =4.35V, 10mA≤Iout≤1A AMS1117-3.3 Vin =4.8V, 10mA≤Iout≤1A AMS1117-5.0 Vin =6.5V, 10mA≤Iout≤1A Vdrop Imin Dropout voltage Minimum load current AMS1117-1.2V,Vin=10V Iq Iadj AMS1117-1.5V,Vin=10V 2 5 mA Quiescent AMS1117-1.8V,Vin=12V 2 5 mA Current AMS1117-2.5V,Vin=12V 2 5 mA AMS1117-2.85V,Vin=12V 2 5 mA AMS1117-3.3V,Vin=12V 2 5 mA AMS1117-5.0V,Vin=12V 2 5 mA AMS1117-ADJ 55 120 uA 0.2 10 uA Adjust pin current Ichange Ver2.2 2 Iadj change Vin=5V,10mA≤Iout≤1A AMS1117-ADJ 5 Nov.17.2020 A S1117 1A Bipolar Linear Regulator Vin=5V,10mA≤Iout≤1A Thermal Junction Temperature +200 Junction Temperature +30 ℃ Shutdown OTP Thermal Shutdown ℃ Hysteresis Temperature ΔVout coefficient Vin=4.5V, Iout=10mA 30 VOUT=3.3V mV 20℃≤Ta≤120℃ θJC Thermal resistance SOT-223 20 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 AMS1117-ADJ will lead to unstable or oscillation output. Detailed Description AMS1117is 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 AMS1117 has an adjustable version and six fixed versions (1.2V, 1.5V,1.8V, 2.5V, 2.85V , 3.3V and 5V)Fixed Output Voltage Version AMS1117 Application circuit of AMS1117 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. Ver2.2 6 Nov.17.2020 A S1117 1A Bipolar Linear Regulator Adjustable Output Voltage Version AMS1117 Application Circuit of AMS1117-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) To meet the minimum load current (>10mA) requirement, R1 is recommended to be 125ohm or lower. As AMS1117-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 CADJ should satisfy this equation: 1/(2π×fripple×CADJ)