AF1117 ETC
Document overview
- Manufacturer or author: Provided By www.digicamel.com(free datasheet download site)
- PDF pages: 10
Technical content
http://www.afsemi.com AF-1V0 1A Bipolar Linear Regulator Features Applications Maximum output current is 1A Range of operation input voltage: Max 15V Line regulation: 0.03%/V (typ.) Standby current: 2mA (typ.) Load regulation: 0.2%/A (typ.) Environment Temperature: -20℃~85℃ Power Management for ComputerMother Board, Graphic Card LCD Monitor and LCD TV DVD Decode Board ADSL Modem Post Regulators For Switching Supplies General Description AF1117 is a series of low dropout three -terminal regulators with a dropout of 1.3V at 1A load current. AF1117 features a very low standby current 2mA compared to 5mA of competitor. Other than a fixed version, V out = 1.2V , 1.8V , 2.5V , 3.3V , 5V , and 12V , AF1117 has an adjustable version, which can provide an output voltage from 1.25 to 12V with only two external resistors. AF1117 offers thermal shut down and current limit functions, to assure the stability of chip and power system. And it uses trimming technique toguarantee output voltage accuracy within 2%. Other output voltage accuracy can b e customized on demand, such as 1%.AF1117 is available in SOT-223, TO-252 power package. Typical Application Typical Electrical Characteristic Temperature（℃）
http://www.afsemi.com AF-1V0 Block Diagram Pin Configuration Absolute Maximum Rating Parameter Value Max Input Voltage Max Power Dissipation(Pd) 1.2 W Max Output Current 1A Recommended operating junction temperature(Tj) -20~125℃ Max Operating Junction Temperature(Tj) 150℃ Ambient Temperature(Ta) -40℃ – 85℃ Package Thermal Resistance SOT-223 20℃ / W TO-252 12.5℃ / W Storage Temperature(Ts) -40℃ - 150℃ Lead Temperatu e & Time 260℃, 10S Caution: Exceed these limits to damage to the device. Exposure to absolute maximum rating conditions may affect device reliability. Exceptional for AF1117A-12V , the maximum input voltage for AF1117A-12V is 20V . Thermal Information 1：Vss/ADJ 2：V out 3：Vin 1 2 3 1 3 TO-223 TO-252
http://www.afsemi.com AF-1V0 Parameter Package Rating Unit Package thermal resistance SOT-223 20 ℃/W TO-252 12.5 ℃/W Selection Table Marking Part No. Output Voltage Package AF1117 XXX YYZZ XX=1V2 1.2V SOT-223 TO-252 XXX=1V8 1.8V XXX=2V5 2. 5V XXX=2V8 2.85V XXX=3V3 3.3V XXX=5V0 5.0V XXX=ADJ Adj YYZZ Date code Ordering Information AF1117 XXX L/O Package type: L(SOT-223)O(TO-252) Output Voltages(1.2~12.0V) Product code Electrical Characteristics Symbol Parameter Conditions Min Typ Max Unit Vref Reference voltage AF1117-ADJ 10mA≤Iout≤1A,Vin=3.25V 1.225 1.25 1.275 V V out Output voltage AF1117-1.2V 0≤Iout≤1A , Vin=3.2V 1.176 1.2 1.224 V AF1117-1.8V 0≤Iout≤1A , Vin=3.8V 1.764 1.8 1.836 V AF1117-2.5V 0≤Iout≤1A , Vin=4.5V 2.45 2.5 2.55 V AF1117-2.85V 0≤Iout≤1A , Vin=4.85V 2.793 2.85 2.907 V
http://www.afsemi.com AF-1V0 AF1117-3.3V 0≤Iout≤1A , Vin=5.3V 3.234 3.3 3.366 V AF1117-5.0V 0≤Iout≤1A , Vin=7.0V 4.9 5 5.1 V AF1117-12.0V 0≤Iout≤1A , Vin=14V 11.76 12 12.24 V ΔVout Line Regulation AF1117-1.2V Iout=10mA, 2.7V≤Vin≤10V 0.03 0.2 %/V AF1117-ADJ Iout=10mA, 2.75V≤Vin≤12V 0.03 0.2 %/V AF1117-1.8V Iout=10mA, 3.3V≤Vin≤12V 0.03 0.2 %/V AF1117-2.5V Iout=10mA, 4.0V≤Vin≤12V 0.03 0.2 %/V AF1117-2.85V Iout=10mA,4.35V≤Vin≤12V 0.03 0.2 %/V AF1117-3.3V Iout=10mA, 4.8V≤Vin≤12V 0.03 .2 %/V AF1117-5.0V Iout=10mA, 6.5V≤Vin≤12V 0.03 0.2 %/V △Vout Load rgulation AF1117-1.2V Vin =2.7V, 10mA≤Iout≤1A 2 8 mV AF1117-ADJ Vin =2.75V, 10mA≤Iout≤1A 2 8 mV AF1117-1.8V Vin =3.3V, 10mA≤Iout≤1A 3 12 mV AF1117-2.5V Vin =4.0V, 10mA≤Iout≤1A 4 16 mV AF1117-2.85V Vin =4.35V, 10mA≤Iout≤1A 5 20 mV AF1117-3.3 Vin =4.8V, 10mA≤Iout≤1A 6 24 mV AF1117-5.0 Vin =6.5V, 10mA≤Iout≤1A 9 36 mV Vdrop Dropout voltage Iout =100mA 1.23 1.3 V Iout=1A 1.3 1.5 V Ilimit Current limit Vin-Vout=2V;Tj =25℃ 1.1 1.2 A Imin Minimum load current AF1117-ADJ 2 10 mA Iq Quiescent Current AF1117-1.2V,Vin=10V 2 5 mA AF1117-1.8V,Vin=12V 2 5 mA
http://www.afsemi.com AF-1V0 AF1117-2.5V,Vin=12V 2 5 mA AF1117-2.85V,Vin=12V 2 5 mA AF1117-3.3V,Vin=12V 2 5 mA AF1117- .0V,Vin=12V 2 5 mA IAdj Adjust pin current AF1117-ADJ Vin=5V,10mA≤Iout≤1A 55 120 uA PSRR 1117 f=100Hz, Cout=104 -65 dB f=1KHz, Cout=104 -65 dB f=10KHz, Cout=104 -60 dB f=22KHz, Cout=104 -57 dB Ichang e Iadj change AF1117-ADJ Vin=5V,10mA≤Iout≤1A 0.2 10 uA ΔV/ΔT Temperature coefficien ± 100 ppm θJC Thermal resistance SOT-223 20 ℃/W TO-252 12.5 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 AF1117-ADJ will lead to unstable or oscillation output. Detailed Description AF1117 is a series of low dropout voltage, three terminal regulators. Its application circuit is very simple: the fixed version only needs two capacit ors 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, current limit, 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 con siderations. The temperature coefficient is under 100 ppm/° C. And the accuracy of output voltage is guaranteed by trimming technique. Typical Application Fixed Output Voltage Version
http://www.afsemi.com AF-1V0 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 The output voltage of adjustable version follows the equation: V out=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 AF1117-ADJ can keep itself stable at load current about 2mA, R1 is not allowed to be higher than 625ohm. 2) Using a bypass capacitor (C ADJ) between the ADJ pin an d 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 10 0Ω~500Ω, the value of CADJ should satisfy this equation: 1/(2π×fripple×CADJ)<R1. Thermal Considerations We have to take heat dissipation into great consideration when output current or differential voltage of input and output voltage is large. Be cause in such cases, the power dissipation consumed by AF1117 is very large. AF1117 seriesuses SOT-223 package type and its thermal resistance is about 20° C/W. And the copper area of application board can affect the total thermal resistance. If copper area is 5cm*5cm (two sides), the resistance is about 30° C/W. So the total thermal resistance is about 20° C/W + 30° C/W. We can decrease total thermal resistance by increasing copper area in application board. When there is no good heat dissipation copper a re in PCB, the total thermal resistance will be as high as 120° C/W, then the power dissipation of AF1117 could allow on itself is less than 1W. And furthermore, AF1117 will work at junction temperature higher than 125° C under such condition and no lifetime is guaranteed.
http://www.afsemi.com AF-1V0 Typical Performance Characteristics T=25° C unless specified. Line Regulation Load Regulation AF1117-ADJ V out Vs. Vin AF1117 -ADJ V out Vs. Iout Dropout Voltage Thermal performance with OTP AF1117-ADJ Dropout Vs. Iout AF1117-ADJ V out Vs. Temp
http://www.afsemi.com AF-1V0 Package Information SOT-223
http://www.afsemi.com AF-1V0 TO-252-2L
http://www.afsemi.com AF-1V0 DISCLAIMER AFSEMI RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. AFSEMI DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPL ICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICIENCE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. THE GRAPHS PROVIDED IN THIS DOCUMENT ARE STATISTICAL SUMMARIE S BASED ON A LIMITED NUMBER OF SAMPLES AN D ARE P ROVIDED FOR INFORMAT IONAL PURPOSE ONLY. THE PERFORMANCE CHARACTE RISTICS LISTED IN TH EM ARE NOT TESTED OR GUARANTEED. IN SOME GRAPHS, THE DATA PRESENTED MAY BE OUTSIDE THE SPECIFIED OPERATING RANGE (E.G,. OUTSIDE SPECIFIED POWER SUPPLY RANGE ) AND THEREFORE OUTSIDE THE WARRANTED RANGE.