LM1117/LM1117I 800mA Low-Dropout Linear Regulator

1 lm1117 /LM1117I800mA Low-Dropout Linear RegulatorGeneral DescriptionThe lm1117 is a series of low dropout voltage regulatorswith a dropout of at 800mA of load current. It has thesame pin-out as National Semiconductor s industry lm1117 is available in an adjustable version, which canset the output voltage from to with only twoexternal resistors. In addition, it is also available in five fixedvoltages, , , , , and lm1117 offers current limiting and thermal shutdown. Itscircuit includes a zener trimmed bandgap reference to as-sure output voltage accuracy to within 1%.The lm1117 series is available in LLP, TO-263, SOT-223,TO-220, and TO-252 D-PAK packages.

2 A minimum of 10 Ftantalum capacitor is required at the output to improve thetransient response and in , , , , 5V, and AdjustableVersionsnSpace Saving SOT-223 and LLP PackagesnCurrent Limiting and Thermal ProtectionnOutput Current800mAnLine (Max)nLoad (Max)nTemperature Range LM11170 C to 125 C lm1117i 40 C to 125 Model for SCSI-2 Active TerminationnPost Regulator for Switching DC/DC ConverternHigh Efficiency Linear RegulatorsnBattery ChargernBattery Powered InstrumentationTypical ApplicationActive Terminator for SCSI-2 Bus10091905 Fixed Output Regulator10091928 April 2006LM1117/ lm1117i 800mA Low-Dropout Linear Regulator 2006 National Semiconductor InformationPackageTemperatureRangePart NumberPackaging MarkingTransport MediaNSCD rawing3-leadSOT-2230 C to +125 CLM1117 MPX-ADJN03 ATape and and and and and and Reel 40 C to +125 CLM1117 IMPX-ADJN03 BTape and and and Reel3-lead TO-2200 C to +125 TO-2520 C to

3 +125 CLM1117 DTX-ADJLM1117DT-ADJTape and and and and and and Reel 40 C to +125 CLM1117 IDTX-ADJLM1117 IDT-ADJTape and and and Reel8-lead LLP0 C to +125 CLM1117 LDX-ADJ1117 ADJTape and and and and and and Reel 40 C to 125 CLM1117 ILDX-ADJ1117 IADTape and and and ReelTO-2630 C to +125 CLM1117SX-ADJLM1117 SADJTape and and and and ReelLM1117 Diagram10091901 Connection DiagramsSOT-22310091904 Top ViewTO-22010091902 Top ViewTO-25210091938 Top ViewTO-26310091944 Top View10091945 Side ViewLLP10091946 When using the LLP packagePins 2,3&4must be connected together andPins 5,6&7must be connected togetherTop ViewLM1117 Maximum Ratings(Note 1)If Military/Aerospace specified devices are required,please contact the National Semiconductor Sales Office/Distributors for availability and Input Voltage (VINto GND)20 VPower Dissipation (Note 2)Internally LimitedJunction Temperature (TJ)(Note 2)150 CStorage Temperature Range-65 C to 150 CLead TemperatureTO-220 (T) Package260 C, 10 secSOT-223 (IMP) Package260 C, 4 secESD Tolerance (Note 3)2000 VOperating Ratings(Note 1)Input Voltage (VINto GND)15 VJunction Temperature Range (TJ)(Note 2)LM11170 C to 125 CLM1117I 40 C to 125 CLM1117 Electrical CharacteristicsTypicals and limits appearing in normal type apply for TJ= 25 C.

4 Limits appearing inBoldfacetype apply over the entire junc-tion temperature range for operation, 0 C to 125 (Note 5)Typ(Note 4)Max(Note 5)UnitsVREFR eference VoltageLM1117-ADJIOUT= 10mA, VIN-VOUT= 2V, TJ= 25 C10mA IOUT 800mA , VIN-VOUT 10mA, VIN= , TJ= 25 C0 IOUT 800mA , VIN 10mA, VIN= , TJ= 25 C0 IOUT 800mA , VIN 10mA, VIN= , TJ= 25 C0 IOUT 800mA , VIN 10V0 IOUT 500mA, VIN= 10mA, VIN=5 VTJ= 25 C0 IOUT 800mA , VIN 10mA, VIN= 7V, TJ= 25 C0 IOUT 800mA , VIN VOUTLine Regulation(Note 6) lm1117 -ADJIOUT= 10mA, VIN-VOUT 0mA, VIN 0mA, VIN 0mA, VIN 0mA, VIN 0mA, VIN 15V110mVLM1117 Electrical Characteristics(Continued)Typicals and limits appearing in normal type apply for TJ= 25 C.

5 Limits appearing inBoldfacetype apply over the entire junc-tion temperature range for operation, 0 C to 125 (Note 5)Typ(Note 4)Max(Note 5)Units VOUTLoad Regulation(Note 6) lm1117 -ADJVIN-VOUT= 3V, 10 IOUT , 0 IOUT , 0 IOUT , 0 IOUT , 0 IOUT , 0 IOUT 800mA115mVVIN-VOUTD ropout Voltage(Note 7)IOUT= LimitVIN-VOUT= 5V, TJ= 25 C80012001500mAMinimum LoadCurrent (Note 8) lm1117 -ADJVIN= 15V510mAThermal RegulationTA= 25 C, 30ms RegulationfRIPPLE=1 20Hz, VIN-VOUT=3 VVRIPPLE=1 VPP6075dBAdjust Pin Current60120 AAdjust Pin CurrentChange10 IOUT 800mA , VIN-VOUT ATemperature Term StabilityTA= 125 C, Output Noise(% of VOUT), 10Hz f ResistanceJunction-to-Case3-Lead C/W3-Lead C/W3-Lead TO-25210 C/WThermal ResistanceJunction-to-Ambient(No air flow)3-Lead SOT-223 (No heat sink)136 C/W3-Lead TO-220 (No heat sink)79 C/W3-Lead TO-252 (Note 9) (No heat sink)92 C/W3-Lead TO-26355 C/W8-Lead LLP(Note 10)40 C/WLM1117 Electrical CharacteristicsTypicals and limits appearing in normal type apply for TJ= 25 C.

6 Limits appearing inBoldfacetype apply over the entire junc-tion temperature range for operation, 40 C to 125 (Note 5)Typ(Note 4)Max(Note 5)UnitsVREFR eference VoltageLM1117I-ADJIOUT= 10mA, VIN-VOUT= 2V, TJ= 25 C10mA IOUT 800mA , VIN-VOUT 10mA, VIN= 5V, TJ= 25 C0 IOUT 800mA , VIN 10mA, VIN= 7V, TJ= 25 C0 IOUT 800mA , VIN VOUTLine Regulation(Note 6) lm1117i -ADJIOUT= 10mA, VIN-VOUT 0mA, VIN 0mA, VIN 15V115mV VOUTLoad Regulation(Note 6) lm1117i -ADJVIN-VOUT= 3V, 10 IOUT , 0 IOUT , 0 IOUT 800mA120mVVIN-VOUTD ropout Voltage(Note 7)IOUT= LimitVIN-VOUT= 5V, TJ= 25 C80012001500mAMinimum LoadCurrent (Note 8) lm1117i -ADJVIN= 15V515mAThermal RegulationTA= 25 C, 30ms RegulationfRIPPLE=1 20Hz, VIN-VOUT=3 VVRIPPLE=1 VPP6075dBAdjust Pin Current60120 AAdjust Pin CurrentChange10 IOUT 800mA , VIN-VOUT ATemperature Term StabilityTA= 125 C, Output Noise(% of VOUT), 10Hz f ResistanceJunction-to-Case3-Lead C/W3-Lead TO-25210 C/WThermal ResistanceJunction-to-AmbientNo air flow)3-Lead SOT-223 (No heat sink)136 C/W3-Lead TO-252 (No heat sink)(Note 9)92 C/W8-Lead LLP(Note 10)40 C/WNote 1:Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.

7 Operating Ratings indicate conditions for which the device isintended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical 2:The maximum power dissipation is a function of TJ(max), JA, and TA. The maximum allowable power dissipation at any ambient temperature isPD=(TJ(max) TA)/ JA. All numbers apply for packages soldered directly into a PC 3:For testing purposes, ESD was applied using human body model, in series with 4:Typical Values represent the most likely parametric 5:All limits are guaranteed by testing or statistical 6:Load and line regulation are measured at constant junction room 7:The dropout voltage is the input/output differential at which the circuit ceases to regulate against further reduction in input voltage.

8 It is measured when theoutput voltage has dropped 100mV from the nominal value obtained at VIN=VOUT+ 8:The minimum output current required to maintain 9:Minimum pad size of 10:Thermal Performance for the LLP was obtained using JESD51-7 board with six vias and an ambient temperature of 22 C. For information about improvedthermal performance and power dissipation for the LLP, refer to Application Note Performance CharacteristicsDropout Voltage (VIN-VOUT)Short-Circuit Current1009192210091923 Load RegulationLM1117-ADJ Ripple Rejection1009194310091906LM1117 Performance Characteristics(Continued) lm1117 -ADJ Ripple Rejection vs. CurrentTemperature Stability1009190710091925 Adjust Pin Load Transient Load Transient Line Transient Response1009190910091910LM1117 Performance Characteristics(Continued) Line Transient Response10091911 Application EXTERNAL Input Bypass CapacitorAn input capacitor is recommended.

9 A 10 F tantalum on theinput is a suitable input bypassing for almost all Adjust Terminal Bypass CapacitorThe adjust terminal can be bypassed to ground with a by-pass capacitor (CADJ) to improve ripple rejection. This by-pass capacitor prevents ripple from being amplified as theoutput voltage is increased. At any ripple frequency, theimpedance of the CADJ should be less than R1 to prevent theripple from being amplified:1/(2 *fRIPPLE*CADJ)<R1 The R1 is the resistor between the output and the adjust value is normally in the range of 100-200 . For example,with R1 = 124 and fRIPPLE= 120Hz, the CADJ should be>11 Output CapacitorThe output capacitor is critical in maintaining Regulator sta-bility, and must meet the required conditions for both mini-mum amount of capacitance and ESR (Equivalent SeriesResistance).

10 The minimum output capacitance required bythe lm1117 is 10 F, if a tantalum capacitor is used. Anyincrease of the output capacitance will merely improve theloop stability and transient response. The ESR of the outputcapacitor should range between -22 . In the case ofthe adjustable Regulator , when the CADJis used, a largeroutput capacitance (22 f tantalum) is OUTPUT VOLTAGEThe lm1117 adjustable version develops a referencevoltage, VREF, between the output and the adjust shown inFigure 1, this voltage is applied across resistorR1 to generate a constant current I1. The current IADJ fromthe adjust terminal could introduce error to the output. Butsince it is very small (60 A) compared with the I1 and veryconstant with line and load changes, the error can be ig-nored.