SK1117-ADJ

AMS1117 1A Bipolar Linear Regulator Features  Maximum output current is 1.4A  Standby current: 2mA (typ.)  Range of operation input voltage: Max 30V  Load regulation: 0.2%/A (typ.)  Line regulation: 0.03%/V (typ.)  Environment Temperature: -40℃~ 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 AMS1117 offers thermal shut down function, to assure the regulators with a dropout of 1.3V at 1A load current. stability of chip and power system. And it uses trimming AMS1117 features a very low standby current 2mA technique to guarantee output voltage accuracy within compared to 5mA of competitor. 2%. Other output voltage accuracy can be customized on Other than a fixed version, Vout = 1.2V, 1.8V, 2.5V, 2.85V， demand, such as 3.3V, and 5V, AMS1117 has an adjustable version, which AMS1117 is available in SOT-223 package. 1%. can provide an output voltage from 1.25 to 12V with only two external resistors. Typical Application AMS1117 Application circuit of AMS1117 fixed version Typical Electrical Characteristic REV.08 1 of 7 1A Bipolar Linear Regulator AMS1117 Block Diagram Pin Configuration Absolute Maximum Ratings Max Input Voltage ······························································································································30V 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 ·································································································· 18V Recommended operating junction temperature(Tj) ················································································ -20~125℃ Thermal Information Parameter Package Package thermal resistance REV.08 Rating Unit 20 ℃/W SOT-223 2 of 7 1A Bipolar Linear Regulator AMS1117 Electrical Characteristics TA=25℃, unless otherwise noted. Symbol Parameter Vref Reference voltage Conditions AMS1117 -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 -1.2V 0≤Iout≤1A , Vin=3.2V -1.8V 0≤Iout≤1A , Vin=3.8V -2.5V Vout Output voltage 0≤Iout≤1A , Vin=4.5V -2.85V 0≤Iout≤1A , Vin=4.85V -3.3V 0≤Iout≤1A , Vin=5.3V -5.0V 0≤Iout≤1A , Vin=7.0V -1.2V Iout=10mA, 2.7V≤Vin≤10V -ADJ Iout=10mA, 2.75V≤Vin≤12V -1.8V Iout=10mA, 3.3V≤Vin≤12V △Vout Line regulation -2.5V Iout=10mA, 4.0V≤Vin≤12V -2.85V Iout=10mA, 4.35V≤Vin≤12V -3.3V Iout=10mA, 4.8V≤Vin≤12V -5.0V Iout=10mA, 6.5V≤Vin≤12V -1.2V Vin =2.7V, 10mA≤Iout≤1A -ADJ Vin =2.75V, 10mA≤Iout≤1A -1.8V Vin =3.3V, 10mA≤Iout≤1A REV.08 3 of 7 1A Bipolar Linear Regulator △Vout Load AMS1117 -2.5V AMS1117 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 AMS1117-ADJ 2 10 mA AMS1117 -1.2V,Vin=10V 2 5 mA -1.8V,Vin=12V 2 5 mA Quiescent -2.5V,Vin=12V 2 5 mA Current -2.85V,Vin=12V 2 5 mA -3.3V,Vin=12V 2 5 mA -5.0V,Vin=12V 2 5 mA 55 120 uA 0.2 10 uA regulation Vin =4.0V, 10mA≤Iout≤1A -2.85V Vin =4.35V, 10mA≤Iout≤1A -3.3 Vin =4.8V, 10mA≤Iout≤1A -5.0 Vin =6.5V, 10mA≤Iout≤1A Vdrop Imin Dropout voltage Minimum load current Iq IAdj Adjust pin current Ichange Iadj change AMS1117 -ADJ Vin=5V,10mA≤Iout≤1A AMS1117-ADJ Vin=5V,10mA≤Iout≤1A ΔV/ΔT Temperature ±100 ppm 20 ℃/W coefficien θJC Thermal resistance SOT-223 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. REV.08 4 of 7 1A Bipolar Linear Regulator AMS1117 Detailed Description AMS1117 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 AMS1117 has an adjustable version and six fixed versions (1.2V, 1.8V, 2.5V, 2.85V , 3.3V and 5V) Fixed Output Voltage Version 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. Adjustable Output Voltage Version 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. REV.08 5 of 7 1A Bipolar Linear Regulator 2) AMS1117 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)