AH1117CLTR25

AH1117 1A Bipolar Linear Regulator DESCRIPTION FEATURES AH1117 is a series of low dropout three-terminal regulators with a typical dropout of 1.3V at 1A load current. Besides fixed voltage version ( Vout = 1.2V, 1.5,,1.8V, 2.5V, 3.3V, 5V), AH1117 has an adjustable version that can provide an output voltage from 1.25 to 12V with two external resistors.      Maximum output current is 1A Range of operation input voltage: Max 15V Line regulation: 0.1%/V (typ.) Load regulation: 10mV (typ.) Environment Temperature: -20C~85C APPLICATIONS AH1117 offers thermal shut down functions to assure stability of chip and power system. Trimming technique is used to guarantee output voltage accuracy within 2%. AH1117 is available in SOT-223, TO-252 power packages.       DVB Computer Mother Board, Graphic Card LCD Monitor and LCD TV DVD Decode Board ADSL Modem Post Regulators for Switching Supplies ORDERING INFORMATION PIN CONFIGURATION AH1117 □1 □2 □3 □4 □5 Code AH1117CLTR□4 □4 Product Classification Marking 1117: Product Code H: Fab Code 1117 H XX: XXYYZZ Output Voltage YY: Lot No. ZZ: Date Code AH1117COTR□4 □4 Product Classification 1117: Product Code H:Fab Code 1117 H XX: XXYYZZ Output Voltage YY:Lot No. □1 □2 □3 □4 □5 Description Temperature&Rohs: C:-40~85C ,Pb Free Rohs Std. Package type: L:SOT-223 O:TO-252 Packing type: TR:Tape&Reel (Standard) Output voltage: e.g. 12=1.2V 15=1.5V 18=1.8V 25=2.5V 33=3.3V 50=5.0V AD=Output adjustable Voltage accuracy: Blank(default)=±2% ZZ:Date Code Vss/Adj Ground Pin/Adjustable Supply Voltage Input Vin Output Voltage Vout 1 AH1117 ABSOLUTE MAXIMUM RATING Parameter Value 15V 150C -40C – 85C 20C / W 10C / W -40C - 150C 260C, 10S Max Input Voltage Max Operating Junction Temperature(Tj) Ambient Temperature(Ta) SOT-223 Package Thermal Resistance TO-252 Storage Temperature(Ts) Lead Temperature & Time Note: Exceed these limits to damage to the device. Exposure to absolute maximum rating conditions may affect device reliability. RECOMMENDED WORK CONDITIONS Parameter Value Max. 12V -20C –125C Input Voltage Range Operating Junction Temperature(Tj) TYPICAL APPLICATION AH1117 LC1117 Vin Vin 10uF Vout Vout 10uF Gnd Application circuit of AH1117 fixed version 2 AH1117 ELECTRICAL CHARACTERISTICS Tj=25C Symbol Vref Parameter Reference Voltage Conditions AH1117-ADJ 10mA≤Iout≤1A , Vin=3.25V AH1117-1.2V 0≤Iout≤1A , Vin=3.2V AH1117-1.8V 0≤Iout≤1A , Vin=3.8V AH1117-2.5V Vout Output Voltage 0≤Iout≤1A , Vin=4.5V AH1117-3.3V 0≤Iout≤1A , Vin=5.3V AH1117-5.0V 0≤Iout≤1A , Vin=7.0V AH1117-12.0V 0≤Iout≤1A , Vin=14V AH1117-1.2V Iout=10mA, 2.7V≤Vin≤10V AH1117-ADJ Iout=10mA, 2.75V≤Vin≤12V AH1117-1.8V Iout=10mA, 3.3V≤Vin≤12V ΔVout Line Regulation AH1117-2.5V Iout=10mA, 4.0V≤Vin≤12V AH1117-3.3V Iout=10mA, 4.8V≤Vin≤12V AH1117-5.0V Iout=10mA, 6.5V≤Vin≤12V AH1117-12.0V Iout=10mA, 13.5V≤Vin≤20V AH1117-ADJ Vin =2.7V, 10mA≤Iout≤1A AH1117-ADJ Vin =2.75V, 10mA≤Iout≤1A AH1117-1.8V Vin=3.3V, 10mA≤Iout≤1A ΔVout Load Regulation AH1117-2.5V Vin=4.0V, 10mA≤Iout≤1A AH1117-3.3V Vin=4.8V, 10mA≤Iout≤1A AH1117-5.0V Vin=6.5V, 10mA≤Iout≤1A AH1117-12.0V Vin=13.5V, 10mA≤Iout≤1A 3 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 3.234 3.3 3.366 V 4.9 5 5.1 V 11.76 12 12.24 V 0.1 0.2 %/V 0.1 0.2 %/V 0.1 0.2 %/V 0.1 0.2 %/V 0.1 0.2 %/V 0.1 0.2 %/V 0.1 0.2 %/V 10 30 mV 10 30 mV 10 30 mV 10 30 mV 10 30 mV 10 30 mV 10 30 mV AH1117 ELECTRICAL CHARACTERISTICS continued Tj=25C Symbol Parameter Conditions Min Typ Max Unit Iout=100mA 1.23 1.3 V Iout=1A 1.3 1.5 V Vdrop Dropout Voltage Ilimit Current Limit Vin-Vout=2V, Tj=25°C Imin Minimum Load Current AH1117-ADJ 2 10 mA AH1117-1.2V, Vin =10V 2 3.5 mA AH1117-1.8V, Vin =12V 2 3.5 mA AH1117-2.5V,Vin =12V 2 3.5 mA AH1117-3.3V, Vin =12V 2 3.5 mA AH1117-5.0V, Vin =12V 2 3.5 mA AH1117-12.0V, Vin =20V 2 3.5 mA 55 120 uA 0.2 10 uA Iq IAdj Quiescent Current Adjust Pin Current Ichange Iadj change ΔV/ΔT Temperature coefficient JC Thermal Resistance AH1117-ADJ Vin =5V, 10mA≤Iout≤1A AH1117-ADJ Vin =5V, 10mA≤Iout≤1A 1 A ±100 SOT-223 20 TO-252 10 ppm °C/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 AH1117-ADJ will lead to unstable or oscillation output. BLOCK DIAGRAM 4 AH1117 DETAILED DESCRIPTION AH1117 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, 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 considerations. The temperature coefficient is under 100 ppm/°C. And the accuracy of output voltage is guaranteed by trimming technique. TYPICAL APPLICATION AH1117 has an adjustable version and six fixed versions (1.2V, 1.5V,1.8V, 2.5V, 3.3V and 5V ) Fixed Output Voltage Version AH1117 LC1117 Vin Vin 10uF Vout Vout 10uF Gnd Application circuit of AH1117 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 AH1117-ADJ provides a 1.25V reference voltage. Any output voltage between 1.25V~12V can be achievable by choosing two external resistors (schematic is shown below), R1 and R2 LC1117-ADJ AH1117 Vin Vin 10uF Vout Vout ADJ R1 10uF R2 Application Circuit of AH1117-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). 5 AH1117 1) To meet the minimum load current (>10mA) requirement, R1 is recommended to be 125ohm or lower. As AH1117-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 CADJ 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/(2frippleCADJ)