LR1117CS33X

LESHAN RADIO COMPANY, LTD. 1A Bipolar Linear Regulator LR1117C DESCRIPTION FEATURES LR1117C is a series of low dropout three - terminal regulators with a dropout of 1.3V at 1A load current. LR1117C features a very low standby current 2mA compared to 5mA of competitor.  Other than a fixed version, Vout = 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5V, and 12V, LR1117C has an adjustable version, which can provide an output voltage from 1.25 to 12V with only two external resistors. LR1117C offers thermal shut down and current limit functions, to assure the stability of chip and power system. And it uses trimming technique to guarantee output voltage accuracy within 2%. Other output voltage accuracy can be customized on demand, such as 1%       Other than a fixed version and an adjustable version, output value can be customized on demand. Maximum output current is 1A Range of operation input voltage: Max 12V Standby current: 2mA (typ.) Line regulation: 0.1%/V (typ.) Load regulation: 10mV (typ.) Environment Temperature: -40C~85C APPLICATIONS  Power Management for Computer Mother Board, Graphic Card BLD Monitor and BLD TV DVD Decode Board ADSL Modem Post Regulators for Switching Supplies LR1117C is available in SOT-223, TO-252 power package.     TYPICAL APPLICATION TYPICAL ELECTRICAL CHARACTERISTIC LR1117C Vin Vin 10uF Vout Vout Gnd LR1117C 10uF Application circuit of LR1117C fixed version NOTE: Input capacitor (Cin=10uF) and Output capacitor (Cout=10uF) are recommended in all application circuit. Tantalum capacitor is recommended. Feb 2011 Ver1.2 1/10 LESHAN RADIO COMPANY, LTD. ORDERING INFORMATION LR1117C X XX X PIN CONFIGURATION AND MARKING Pin Description： Fixed Version Temp. Range & Rohs Std. X： 85C & Pb-free Rohs Std,Output voltage accuracy within 2％ Pin No. 1 2 3 Output Voltage： 12……1.2V 15……1.5V 18……1.8V 25……2.5V 33……3.3V 50……5.0V ……ADJ Package Type： S：SOT-223 D：TO-252 Symbol Gnd Vout Vin Definition Ground Output Input Adjustable Version Pin No. 1 2 3 Symbol Definition Adj. Adjustable Vout Output Vin Input A：Manufacture weeks B：Manufacture LOT No. C: Output Voltage Value D: Temp. Range&Rohs Std Marking information when ordering quantity is less than 200K ABSOLUTE MAXIMUM RATING Parameter Max Input Voltage Max Operating Junction Temperature(Tj) Ambient Operating Temperature(Ta) Package Thermal Resistance SOT-223 TO-252 Storage Temperature(Ts) Lead Temperature & Time Value 15V 150C -40C – 85C 20C / W 10C / W -40C - 150C 260C, 10S Note: Exceed these limits to damage to the device. Exposure to absolute maximum rating conditions may affect device reliability. RECOMMENDED WORK CONDITIONS Parameter Input Voltage Range Operating Junction Temperature(Tj)  Value Max. 12V -20C –125C Exceptional for LR1117C -12V, the maximum input voltage for LR1117C-12V is 20V. Feb 2011 Ver1.2 2/10 LESHAN RADIO COMPANY, LTD. ELECTRICAL CHARACTERISTICS Tj=25C Symbol Vref Vout ΔVout Parameter Reference Voltage Output Voltage Line Regulation Conditions LR1117-ADJ 10mA≤Iout≤1A , Vin=3.25V LR1117-1.2V 0≤Iout≤1A , Vin=3.2V LR1117-1.5V 0≤Iout≤1A , Vin=3.5V LR1117-1.8V 0≤Iout≤1A , Vin=3.8V LR1117-2.5V 0≤Iout≤1A , Vin=4.5V LR1117-3.3V 0≤Iout≤1A , Vin=5.3V LR1117-5.0V 0≤Iout≤1A , Vin=7.0V LR1117-12.0V 0≤Iout≤1A , Vin=14V LR1117-1.2V Iout=10mA, 2.7V≤Vin≤10V LR1117-ADJ Iout=10mA, 2.75V≤Vin≤12V LR1117-1.5V out=10mA, 3.0V≤Vin≤12V LR1117-1.8V Iout=10mA, 3.3V≤Vin≤12V LR1117-2.5V Iout=10mA, 4.0V≤Vin≤12V LR1117-3.3V Iout=10mA, 4.8V≤Vin≤12V LR1117-5.0V Iout=10mA, 6.5V≤Vin≤12V LR1117-12.0V Iout=10mA, 13.5V≤Vin≤20V LR1117-1.2V Vin =2.7V, 10mA≤Iout≤1A LR1117-ADJ Vin =2.75V, 10mA≤Iout≤1A LR1117-1.5V Vin=3.0V, 10mA≤Iout≤1A Min Typ Max Unit 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 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 LR1117-1.8V Vin=3.3V, 10mA≤Iout≤1A ΔVout Load Regulation LR1117-2.5V Vin=4.0V, 10mA≤Iout≤1A LR1117-3.3V Vin=4.8V, 10mA≤Iout≤1A LR1117-5.0V Vin=6.5V, 10mA≤Iout≤1A LR1117-12.0V Vin=13.5V, 10mA≤Iout≤1A Feb 2011 Ver1.2 3/10 LESHAN RADIO COMPANY, LTD. ELECTRICAL CHARACTERISTICS continued Tj=25C Symbol Parameter Vdrop Dropout Voltage Ilimit Current Limit SVR Imin Iq IAdj Supply Voltage Rejection Minimum Load Current Quiescent Current Adjust Pin Current Ichange Iadj change ΔV/ΔT Temperature coefficient Conditions Typ Max Unit Iout=100mA 1.23 1.3 V Iout=1A 1.3 1.5 V Vin-Vout=2V, Tj=25°C Min 1 A 60 f = 120Hz, VIN − VOUT = 3V + 1VPP Ripple dB LR1117-ADJ 2 10 mA LR1117-1.2V, Vin =10V 2 5 mA LR1117-1.5V, Vin =11V 2 5 mA LR1117-1.8V, Vin =12V 2 5 mA LR1117-2.5V,Vin =12V 2 5 mA LR1117-3.3V, Vin =12V 2 5 mA LR1117-5.0V, Vin =12V 2 5 mA LR1117-12.0V, Vin =20V 2 5 mA 55 120 uA 0.2 10 uA LR1117-ADJ Vin =5V, 10mA≤Iout≤1A LR1117-ADJ Vin =5V, 10mA≤Iout≤1A ±100 SOT-223 20 JC Thermal Resistance TO-252 10 JA Thermal Resistance Junction-to-Ambient (No air flow) SOT-223 (No heat sink) 136 TO-252 (No heat sink) 92 ppm °C/W °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 LR1117C-ADJ will lead to unstable or oscillation output. BLOCK DIAGRAM Feb 2011 Ver1.2 4/10 LESHAN RADIO COMPANY, LTD. DETAILED DESCRIPTION LR1117C 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 LR1117C has an adjustable version andsix fixed versions (1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5V and 12V) Fixed Output Voltage Version LR1117C Vin Vin 10uF Vout Vout 10uF Gnd Application circuit of LR1117C fixed version 1) 2) Recommend using 10uF tan capacitor as bypass capacitor (C1) for all application circuit. Recommend using 10uF tan capacitor to assure circuit stability. Adjustable Output Voltage Version LR1117C-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 LR1117C -ADJ Vin Vin 10uF Vout Vout ADJ R1 10uF R2 Application Circuit of LR1117C-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). Feb 2011 Ver1.2 5/10 LESHAN RADIO COMPANY, LTD. 1) To meet the minimum load current (>10mA) requirement, R1 is recommended to be 125ohm or lower. As LR1117C-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)