LR1117DSX

LESHAN RADIO COMPANY, LTD. 1A Bipolar Linear Regulator LR1117' DESCRIPTION FEATURES LR1117 is a series of low dropout three- terminal regulators with a dropout of 1.3V at 1A load current. LR1117 features a very low standby current 2mA compared to 5mA of competitor. xOther than a fixed version and an adjustable version, output value can be customized on demand. x Output current : 1.0A x Range of operation input voltage: Max 15V x Standby current: 2mA (typ.) x Line regulation: 0.03%/V (typ.) x Load regulation: 0.2%/A (typ.) x Environment Temperature: -40qC~85qC Other than a fixed version, Vout = 1.2V, 1.5V, 1.8V, 2.5V, 2.85V, 3.3V, 5V, LR1117 has an adjustable version, which can provide an output voltage from 1.2ϱsto ϭϮV with only two external resistors. LR1117 offers thermal shut down functions, to assure the stability of chip and power system. And it uses trimming technique to guarantee output voltage accuracy within r2%. Other output voltage accuracy can be customized on demand, such as r1% APPLICATIONS x Power Management for Computer Mother Board, Graphic Card BLD Monitor and BLD TV DVD Decode Board ADSL Modem Post Regulators for Switching Supplies LR1117 is available in SOT-223, TO-252 power package. x x x x TYPICAL APPLICATION TYPICAL ELECTRICAL CHARACTERISTIC LR1117D  Vin Vin 10uF Vout Vout Gnd LR1117 10uF Application circuit of LR1117 fixed version NOTE: Input capacitor (Cin=10uF) and Output capacitor (Cout=10uF) are recommended in all application circuit. Tantalum capacitor is recommended. Ver2.3 1/11 Downloaded From Oneyac.com LESHAN RADIO COMPANY, LTD. ORDERING INFORMATION LR1117'X XXX PIN CONFIGURATION AND MARKING Pin Description˖ ˖ Fixed Version Rohs Std. X˖ Pb-free Rohs Std,Output voltage accuracy within r2ˁ Pin No. 1 2 3 Output Voltage˖ 12ĂĂ1.2V 15ĂĂ1.5V 18ĂĂ1.8V 25ĂĂ2.5V 28ĂĂ2.85V 33ĂĂ3.3V 50ĂĂ5.0V ĂĂADJ Symbol Gnd Vout Vin Definition Ground Output Input Adjustable Version Pin No. 1 2 3 Symbol Definition Adj. Adjustable Output Vout Vin Input Package Type˖ S˖SOT-223 D˖TO-252 0DUNLQJ 'HVLJQDWRU :  6 'FUU  VV :6 'F UU VV  'HVFULSWLRQ 5 -? $(A  ;"' '"$! ABSOLUTE MAXIMUM RATING Value Parameter 1ϴVc 150qC 20qC / W 10qC / W -40qC - 150qC 260qC, 10s Max Input Voltage Max Operating Junction Temperature(Tj) Package Thermal Resistance SOT-223 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 Input Voltage Range Operating Junction Temperature(Tj) Value Max. 1ϱV -40qC –125qC 2/11 Downloaded From Oneyac.com LESHAN RADIO COMPANY, LTD. ELECTRICAL CHARACTERISTICS Symbol Vref Vout ȴVout Parameter Reference Voltage Output Voltage Line Regulation Tj=25qC Conditions LR1117D-ADJ 10mAчIoutч1A , Vin=3.25V LR1117D-1.2V 0чIoutч1A , Vin=3.2V LR1117-1.5V 0чIoutч1A , Vin=3.5V LR1117D-1.8V 0чIoutч1A , Vin=3.8V LR1117D-2.5V 0чIoutч1A , Vin=4.5V LR1117D-2.85V 0чIoutч1A , Vin=4.85V LR1117D-3.3V 0чIoutч1A , Vin=5.3V LR1117D-5.0V 0чIoutч1A , Vin=7.0V LR1117D-ADJ Iout=10mA, 2.75VೇVinೇ12V LR1117D-1.2V Iout=10mA, 2.7VೇVinೇ10V LR1117-1.5V out=10mA, 3.0VೇVinೇ12V LR1117D-1.8V out=10mA, 3.0VೇVinೇ12V LR1117D-2.5V Iout=10mA, 3.3VೇVinೇ12V LR1117D-2.85V Iout=10mA, 4.0VೇVinೇ12V LR1117D-3.3V Iout=10mA, 4.8VೇVinೇ12V LR1117D-5.0V Iout=10mA, 6.5VೇVinೇ12V LR1117D-ADJ Vin =2.75V, 10mAೇIoutೇ1A LR1117D-1.2V Vin =2.7V, 10mAೇIoutೇ1A LR1117-1.5V Vin=3.0V, 10mAೇIoutೇ1A LR1117D-1.8V Vin=3.3V, 10mAೇIoutೇ1A LR1117D-2.5V Vin=3.8V, 10mAೇIoutೇ1A ȴVout Load Regulation LR1117D-2.85V Vin=4.35V, 10mAೇIoutೇ1A LR1117D-3.3V Vin=4.8V, 10mAೇIoutೇ1A LR1117D-5.0V Vin=6.5V, 10mAೇIoutೇ1A Min Typ Max Unit 1.225 1.25 1.275 V 1.164 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 0.Ϭϯ 0.2 %/V 0.Ϭϯ 0.2 %/V 0.Ϭϯ 0.2 %/V 0.Ϭϯ 0.2 %/V 0.Ϭϯ 0.2 %/V 0.Ϭϯ 0.2 %/V 0.Ϭϯ 0.2 %/V 0.Ϭϯ 0.2 %/V Ϯ ϴ mV 2 8 mV 2 10 mV 3 12 mV 4 16 mV 5 20 mV 6 24 mV 9 36 mV 3/11 Downloaded From Oneyac.com LESHAN RADIO COMPANY, LTD. ELECTRICAL CHARACTERISTICS continued Tj=25qC Symbol Parameter Conditions Min Iout=100mA Vdrop Dropout Voltage Ilimit Current Limit Vin-Vout=1.5V, Tj=25°C 1 SVR Supply Voltage Rejection f = 120Hz, VIN о VOUT = 3V + 1VPP Ripple 60 Imin Minimum Load Current LR1117D-ADJ Iq IAdj ȴV/ȴT Quiescent Current Adjust Pin Current Thermal Resistance TJA Thermal Resistance Junction-to-Ambient (No air flow) Max Unit 1.15 1.4 V 1.2 1.4 V Iout=1A 1.5 A dB 2 7 mA LR1117D-1.2V, Vin =10V 1 2 5 mA LR1117-1.5V, Vin =11V 1 2 5 mA LR1117D-1.8V, Vin =11V 1 2 5 mA LR1117-1.5V, Vin =11V 1 2 5 mA LR1117D-2.5V, Vin =12V 1 2 5 mA LR1117D-2.85V,Vin =12V 1 2 5 mA LR1117D-3.3V, Vin =12V 1 2 5 mA LR1117D-5.0V, Vin =12V 1 2 5 mA 35 60 uA 1.5V ≤ VIN - VOUT ≤ 10V ILOAD=10 mA Temperature coefficient TJC Typ ±100 SOT-223 20 TO-252 10 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 LR1117-ADJ will lead to unstable or oscillation output. BLOCK DIAGRAM 4/11 Downloaded From Oneyac.com LESHAN RADIO COMPANY, LTD. DETAILED DESCRIPTION LR1117 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 LR1117 has an adjustable version and six fixed versions (1.2V, 1.5V,1.8V, 2.5V, 2.85V, 3.3V, 5V ) Fixed Output Voltage Version LR1117 Vin Vin 10uF Vout Vout 10uF Gnd Application circuit of LR1117 fixed version 1) 2) 3) Recommend using 10uF tan capacitor or MLCC  capacitor as bypass capacitor (C1) for all application circuit. Recommend using 10uF tan capacitor MLCC  capacitor to assure circuit stability. Capacitor ESR range: 3mȍ ~ 22ȍ Adjustable Output Voltage Version LR1117-ADJ provides a1.25V reference voltage. Any output voltage between 1.25V~12V can be achievable by choosing two external resistors (schematic is shown below), R1 and R2 LR1117-ADJ Vin 10uF Vout Vout Vin ADJ R1 10uF R2 Application Circuit of LR1117ͲADJ The output voltage of adjustable version follows the equation: Vout=1.25u(1+R2/R1)+IAdjuR2. We can ignore IAdj because IAdj (about 50uA) is much less than the current of R1 (about 2~10mA). 5/11 Downloaded From Oneyac.com LESHAN RADIO COMPANY, LTD. 1) To meet the minimum load current (>10mA) requirement, R1 is recommended to be 125ohm or lower. As LR1117-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. 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