LM117QML 3-Terminal Adjustable Regulator General Description The LM117 series of adjustable 3-terminal positive voltage regulators is capable of supplying either 0.5A or 1.5A over a 1.2V to 37V output range. They are exceptionally easy to use and require only two external resistors to set the output voltage. Further, both line and load regulation are better than standard fixed regulators. In addition to higher performance than fixed regulators, the LM117 series offers full overload protection available only in IC's. Included on the chip are current limit, thermal overload protection and safe area protection. All overload protection circuitry remains fully functional even if the adjustment terminal is disconnected. Normally, no capacitors are needed unless the device is situated more than 6 inches from the input filter capacitors in which case an input bypass is needed. An optional output capacitor can be added to improve transient response. The adjustment terminal can be bypassed to achieve very high ripple rejection ratios which are difficult to achieve with standard 3-terminal regulators. Besides replacing fixed regulators, the LM117 is useful in a wide variety of other applications. Since the regulator is "floating" and sees only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long as the maximum input to output differential is not exceeded, i.e., avoid short-circuiting the output. Also, it makes an especially simple adjustable switching regulator, a programmable output regulator, or by connecting a fixed resistor between the adjustment pin and output, the LM117 can be used as a precision current regulator. Supplies with electronic shutdown can be achieved by clamping the adjustment terminal to ground which programs the output to 1.2V where most loads draw little current. For the negative complement, see LM137 series data sheet. Features n n n n n n n Available with Radiation Guarantee Guaranteed max. 0.3% load regulation (LM117) Guaranteed 0.5A or 1.5A output current Adjustable output down to 1.2V Current limit constant with temperature 80 dB ripple rejection Output is short-circuit protected Ordering Information NS Part Number JAN Part Number NS Package Number Package Description LM117E/883 E20A 20LD LCC LM117H/883 H03A 3LD T0-39 Metal Can LM117HRQMLV (Note 11) 5962R9951703VXA 100K rd(Si) H03A 3LD T0-39 Metal Can LM117HRLQMLV (Note 12) 5962R9951705VXA 100K rd(Si) H03A 3LD T0-39 Metal Can LM117K/883 K02C 2LD T0-3 Metal Can 5962R9951704VYA 100K rd(Si) K02C 2LD T0-3 Metal Can WG16A 16LD Ceramic SOIC LM117WG-QMLV 5962-9951703VZA WG16A 16LD Ceramic SOIC LM117WGRQMLV (Note 11) 5962R9951703VZA 100K rd(Si) WG16A 16LD Ceramic SOIC LM117WGRLQMLV (Note 12) 5962R9951705VZA 100K rd(Si) WG16A 16LD Ceramic SOIC LM117KRQMLV (Note 11) LM117WG/883 (c) 2006 National Semiconductor Corporation DS201436 www.national.com LM117QML 3-Terminal Adjustable Regulator June 2006 LM117QML Connection Diagrams (TO-3) Metal Can Package (TO-39) Metal Can Package 20143631 CASE IS OUTPUT Bottom View NS Package Number H03A 20143630 CASE IS OUTPUT Bottom View Steel Package NS Package Number K02C Ceramic SOIC Chip Carrier Ceramic Leadless Chip Carrier 20143634 Top View NS Package Number E20A 20143667 Top View NS Package Number WG16A (Note 4) LM117 Series Packages Part Number Design Package Suffix K www.national.com Load Current TO-3 1.5A H T0-39 0.5A WG Ceramic SOIC 0.5A E LCC 0.5A 2 LM117QML Schematic Diagram 20143608 3 www.national.com LM117QML Absolute Maximum Ratings (Note 1) Power Dissipation (Note 2) Internally Limited Input-Output Voltage Differential +40V, -0.3V -65C TA +150C Storage Temperature Maximum Junction Temperature (TJmax +150C Lead Temperature 300C Metal Package Thermal Resistance JA T0-3 Still Air 39C/W T0-3 500LF/Min Air flow 14C/W T0-39 Still Air 186C/W T0-39 500LF/Min Air flow 64C/W Ceramic SOIC Still Air 115C/W Ceramic SOIC 500LF/Min Air flow 66C/W LCC Still Air 88C/W LCC 500LF/Min Air flow 62C/W JC T0-3 1.9C/W T0-39 Metal Can 21C/W Ceramic SOIC (Note 5) 3.4C/W LCC 12C/W Package Weight T0-39 Metal Can TBD SOIC 365mg ESD Tolerance (Note 3) 3KV Recommended Operating Conditions -55C TA +125C Operating Temperature Range Input Voltage Range 4.25V to 41.25V Quality Conformance Inspection MIL-STD-883, Method 5005 - Group A Subgroup Description 1 Static tests at 25 2 Static tests at 125 3 Static tests at -55 4 Dynamic tests at 25 5 Dynamic tests at 125 6 Dynamic tests at -55 7 Functional tests at 25 8A Functional tests at 125 8B Functional tests at -55 9 Switching tests at 25 10 Switching tests at 125 11 Switching tests at -55 12 Settling time at 25 13 Settling time at 125 14 Settling time at -55 www.national.com 4 Temp C LM117QML LM117H & WG DC Parameters Electrical Characteristics The following conditions apply, unless otherwise specified. DC: VDiff = (VI - VO), IL = 8mA Symbol Parameter Conditions Notes Min Max Unit Sub groups VDiff = 3V 100 A 1 IAdj Adjustment Pin Current VDiff = 3.3V 100 A 2, 3 VDiff = 40V 100 A 1, 2, 3 IQ Minimum Load Current VDiff = 3V, VO = 1.7V 5.0 mA 1 VRef VRLine VRLoad IAdj / Load Reference Voltage Line Regulation Load Regulation Adjustment Current Change IAdj / Line Adjustment Current Change VDiff = 3.3V, VO = 1.7V 5.0 mA 2, 3 VDiff = 40V, VO = 1.7V 5.0 mA 1, 2, 3 1 VDiff = 3V 1.2 1.3 V VDiff = 3.3V 1.2 1.3 V 2, 3 VDiff = 40V 1.2 1.3 V 1, 2, 3 3V VDiff 40V, VO = 1.2V -8.9 8.9 mV 1 3.3V VDiff 40V, VO = 1.2V -22.2 22.2 mV 2, 3 VDiff= 3V, IL = 10mA to 500mA -15 15 mV 1 VDiff= 3.3V, IL = 10mA to 500mA -15 15 mV 2, 3 VDiff= 40V, IL = 10mA to 150mA -15 15 mV 1 VDiff= 40V, IL = 10mA to 100mA -15 15 mV 2, 3 VDiff = 3V, IL = 10mA to 500mA -5.0 5.0 A 1 VDiff = 3.3V, IL = 10mA to 500mA -5.0 5.0 A 2, 3 VDiff = 40V, IL = 10mA to 150mA -5.0 5.0 A 1 VDiff = 40V, IL = 10mA to 100mA -5.0 5.0 A 2, 3 3V VDiff 40V -5.0 5.0 A 1 3.3V VDiff 40V -5.0 5.0 A 2, 3 IOS Short Circuit Current VDiff = 10V 0.45 1.6 A 1 R Thermal Regulation TA = 25C, t = 20mS, VDiff = 40V, IL = 150mA -6.0 6.0 mV 1 ICL Current Limit VDiff 15V (Note 6) 0.5 A 1, 2, 3 VDiff = 40V (Note 6) 0.15 A 1 Notes Min Unit Subgroups (Note 7) 66 dB 4, 5, 6 AC Parameters Symbol RR Parameter Ripple Rejection Conditions VI = +6.25V, VO = VRef, = 120Hz, eI = 1VRMS, IL = 125mA 5 Max www.national.com LM117QML LM117K Electrical Characteristics DC Parameters The following conditions apply, unless otherwise specified. DC: VDiff = (VI - VO), IL = 10mA Symbol Parameter Conditions Notes Min Max Unit Sub groups VDiff = 3V 100 A 1 IAdj Adjustment Pin Current VDiff = 3.3V 100 A 2, 3 VDiff = 40V 100 A 1, 2, 3 IQ Minimum Load Current VDiff = 3V, VO = 1.7V 5.0 mA 1 VRef VRLine VRLoad IAdj / Load Reference Voltage Line Regulation Load Regulation Adjustment Current Change IAdj / Line Adjustment Current Change VDiff = 3.3V, VO = 1.7V 5.0 mA 2, 3 VDiff = 40V, VO = 1.7V 5.0 mA 1, 2, 3 1 VDiff = 3V 1.2 1.3 V VDiff = 3.3V 1.2 1.3 V 2, 3 VDiff = 40V 1.2 1.3 V 1, 2, 3 3V VDiff 40V, VO = 1.2V -8.9 8.9 mV 1 3.3V VDiff 40V, VO = 1.2V -22.2 22.2 mV 2, 3 VDiff= 3V, IL = 10mA to 1.5A -15 15 mV 1 VDiff= 3.3V, IL = 10mA to 1.5A -15 15 mV 2, 3 VDiff= 40V, IL = 10mA to 300mA -15 15 mV 1 VDiff= 40V, IL = 10mA to 195mA -15 15 mV 2, 3 VDiff = 3V, IL = 10mA to 1.5A -5.0 5.0 A 1 VDiff = 3.3V, IL = 10mA to 1.5A -5.0 5.0 A 2, 3 VDiff = 40V, IL = 10mA to 300mA -5.0 5.0 A 1 VDiff = 40V, IL = 10mA to 195mA -5.0 5.0 A 2, 3 3V VDiff 40V -5.0 5.0 A 1 3.3V VDiff 40V -5.0 5.0 A 2, 3 IOS Short Circuit Current VDiff = 10V R Thermal Regulation TA = 25C, t = 20mS, VDiff = 40V, IL = 300mA ICL Current Limit VDiff 15V (Note 6) VDiff = 40V (Note 6) Notes Min (Note 7) 66 1.6 3.4 A 1 -10.5 10.5 mV 1 1.5 A 1, 2, 3 0.3 A 1 Unit Subgroups dB 4, 5, 6 AC Parameters Symbol RR Parameter Ripple Rejection www.national.com Conditions VI = +6.25V, VO = VRef, = 120Hz, eI = 1VRMS, IL = 0.5A 6 Max LM117QML LM117E Electrical Characteristics DC Parameters The following conditions apply, unless otherwise specified. DC: VDiff = (VI - VO), IL = 8mA, PD 1.5W Symbol Parameter Conditions Notes Min Max Unit Sub groups VDiff = 3V 100 A 1 IAdj Adjustment Pin Current VDiff = 3.3V 100 A 2, 3 VDiff = 40V 100 A 1, 2, 3 IQ Minimum Load Current VDiff = 3V, VO = 1.7V 5.0 mA 1 VRef VRLine VRLoad Reference Voltage Line Regulation Load Regulation VDiff = 3.3V, VO = 1.7V 5.0 mA 2, 3 VDiff = 40V, VO = 1.7V 5.0 mA 1, 2, 3 1 VDiff = 3V 1.2 1.3 V VDiff = 3.3V 1.2 1.3 V 2, 3 VDiff = 40V 1.2 1.3 V 1, 2, 3 3V VDiff 40V, VO = 1.2V -8.9 8.9 mV 1 3.3V VDiff 40V, VO = 1.2V -22.2 22.2 mV 2, 3 VDiff= 3V, IL = 10mA to 100mA -15 15 mV 1 VDiff= 3.3V, IL = 10mA to 100mA -15 15 mV 2, 3 VDiff= 40V, IL = 10mA to 100mA -15 15 mV 1,2 -25 25 mV 3 VDiff= 3V, IL = 10mA to 500mA -15 15 mV 1 VDiff= 3.3V, IL = 10mA to 500mA -15 15 mV 2, 3 VDiff = 3V, IL = 10mA to 500mA -5.0 5.0 A 1 VDiff = 3.3V, IL = 10mA to 500mA -5.0 5.0 A 2, 3 VDiff = 40V, IL = 10mA to 100mA -5.0 5.0 A 1, 2, 3 IAdj / Line Adjustment Current Change 3V VDiff 40V -5.0 5.0 A 1 3.3V VDiff 40V -5.0 5.0 A 2, 3 IOS Short Circuit Current VDiff = 10V 0.45 1.6 A 1 R Thermal Regulation TA = 25C, t = 20mS, VDiff = 40V, IL = 75mA -6.0 6.0 mV 1 ICL Current Limit VDiff 15V (Note 6) 0.5 A 1, 2, 3 VDiff = 40V (Note 6) 0.15 A 1 Notes Min Unit Subgroups (Note 7) 66 dB 4, 5, 6 IAdj / Load Adjustment Current Change AC Parameters Symbol RR Parameter Ripple Rejection Conditions VI = +6.25V, VO = VRef, = 120Hz, eI = 1VRMS, IL = 100mA, CAdj = 10f 7 Max www.national.com LM117QML LM117H & WG RH Electrical Characteristics DC Parameters (Notes 11, 12) Symbol Parameter Conditions VO Output Voltage VRLine VRLoad Line Regulation Load Regulation Notes Min Max Unit Subgroups VI = 4.25V, IL = -5mA 1.2 1.3 V 1, 2, 3 VI = 4.25V, IL = -500mA 1.2 1.3 V 1, 2, 3 VI = 41.25V, IL = -5mA 1.2 1.3 V 1, 2, 3 VI = 41.25V, IL = -50mA 1.2 1.3 V 1, 2, 3 4.25V VI 41.25V, IL = -5mA -9.0 9.0 mV 1 -23 23 mV 2,3 VI = 6.25V, -500mA IL -5mA -12 12 mV 1, 2, 3 VI = 41.25V, -50mA IL -5mA -12 12 mV 1, 2, 3 VRTh Thermal Regulation VI = 14.6V, IL = -500mA -12 12 mV 1 IAdj Adjust Pin Current VI = 4.25V, IL = -5mA -100 -15 A 1, 2, 3 VI = 41.25V, IL = -5mA -100 -15 A 1, 2, 3 IAdj/ Line Adjust Pin Current Change 4.25V VI 41.25V, IL = -5mA -5.0 5.0 A 1, 2, 3 IAdj / Load Adjust Pin Current Change VI = 6.25V, -500mA IL -5mA -5.0 5.0 A 1, 2, 3 IQ Minimum Load Current VI = 4.25V, Forced VO = 1.4V -3.0 -0.5 mA 1, 2, 3 VI = 14.25V, Forced VO = 1.4V -3.0 -0.5 mA 1, 2, 3 VI = 41.25V, Forced VO = 1.4V -5.0 -1.0 mA 1, 2, 3 VI = 4.25V -1.8 -0.5 A 1, 2, 3 IOS Output Short Circuit Current VI = 40V -0.5 -0.05 A 1, 2, 3 VO (Recov) Output Voltage Recovery VI = 4.25V, RL = 2.5, CL = 20F 1.2 1.3 V 1, 2, 3 1.2 1.3 V 1, 2, 3 VO Output Voltage VI = 6.25V, IL = -5mA 1.2 1.3 V 2 VStart Voltage Start-Up VI = 4.25V, RL = 2.5, CL = 20F, IL = -500mA 1.2 1.3 V 1, 2, 3 Min Max Unit Sub groups VI = 40V, RL = 250 (Note 8) AC Parameters (Notes 11, 12) Symbol Parameter Conditions Notes VNO Output Noise Voltage VI = 6.25V, IL = -50mA 120 VRMS 7 VO / VI Line Transient Response VI = 6.25V, VI = 3V, IL = -10mA 6.0 mV/V 7 VO / IL Load Transient Response VI = 6.25V, IL = -200mA, IL = -50mA 0.6 mV/mA 7 VI / VO Ripple Rejection VI = 6.25V, IL = -125mA, EI = 1VRMS at = 2400Hz dB 4 www.national.com 8 65 RH Electrical Characteristics LM117QML LM117H & WG (Continued) DC Drift Parameters The following conditions apply, unless otherwise specified. Deltas performed on QMLV devices at Group B, Subgroup 5, only. Symbol Parameter Conditions VO Output Voltage Notes Min Max Unit Subgroups VI = 4.25V, IL = -5mA -0.01 0.01 V 1 VI = 4.25V, IL = -500mA -0.01 0.01 V 1 VI = 41.25V, IL = -5mA -0.01 0.01 V 1 VI = 41.25V, IL = -50mA -0.01 0.01 V 1 VRLine Line Regulation 4.25V VI 41.25V, IL = -5mA -4.0 4.0 mV 1 IAdj Adjust Pin Current VI = 4.25V, IL = -5mA -10 10 A 1 VI = 41.25V, IL = -5mA -10 10 A 1 AC/DC Post Radiation Limits @ +25C (Notes 11, 12) Symbol Parameter Conditions Min Max Unit Subgroups VO Output Voltage VI = 4.25V, IL = -5mA Notes 1.2 1.350 V 1 VI = 4.25V, IL = -500mA 1.2 1.350 V 1 VI = 41.25V, IL = -5mA 1.2 1.350 V 1 VI = 41.25V, IL = -50mA 1.2 1.350 V 1 25 mV 1 dB 4 VRLine Line Regulation 4.25V VI 41.25V, IL = -5mA -25 VI / VO Ripple Rejection VI = 6.25V, IL = -125mA EI = 1VRMS at f = 2400Hz 60 VO (Recov) Output Voltage Recovery VI = 4.25V, RL = 2.5, CL = 20f 1.20 1.350 V 1 VI = 40V, RL = 250 1.20 1.350 V 1 9 www.national.com LM117QML LM117K RH Electrical Characteristics DC Parameters (Note 11) Symbol Parameter Conditions VO Output Voltage VRLine VRLoad Line Regulation Load Regulation Notes Min Max Unit Subgroups VI = 4.25V, IL = -5mA 1.2 1.3 V 1, 2, 3 VI = 4.25V, IL = -1.5A 1.2 1.3 V 1, 2, 3 VI = 41.25V, IL = -5mA 1.2 1.3 V 1, 2, 3 VI = 41.25V, IL = -200mA 1.2 1.3 V 1, 2, 3 4.25V VI 41.25V, IL = -5mA -9.0 9.0 mV 1 -23 23 mV 2,3 VI = 6.25V, -1.5A IL -5mA -3.5 3.5 mV 1 -12 12 mV 2, 3 VI = 41.25V, -200mA IL -5mA -3.5 3.5 mV 1 -12 12 mV 2, 3 VRTh Thermal Regulation VI = 14.6V, IL = -1.5A -12 12 mV 1 IAdj Adjust Pin Current VI = 4.25V, IL = -5mA -100 -15 A 1, 2, 3 VI = 41.25V, IL = -5mA -100 -15 A 1, 2, 3 IAdj/ Line Adjust Pin Current Change 4.25V VI 41.25V, IL = -5mA -5.0 5.0 A 1, 2, 3 IAdj / Load Adjust Pin Current Change VI = 6.25V, -1.5A IL -5mA -5.0 5.0 A 1, 2, 3 IQ Minimum Load Current VI = 4.25V, Forced VO = 1.4V -3.0 -0.2 mA 1, 2, 3 VI = 14.25V, Forced VO = 1.4V -3.0 -0.2 mA 1, 2, 3 VI = 41.25V, Forced VO = 1.4V -5.0 -0.2 mA 1, 2, 3 VI = 4.25V -3.5 -1.5 A 1, 2, 3 VI = 40V -1.0 -0.18 A 1, 2, 3 VO (Recov) Output Voltage Recovery VI = 4.25V, RL = 0.833, CL = 20F 1.2 1.3 V 1, 2, 3 1.2 1.3 V 1, 2, 3 VO Output Voltage VI = 6.25V, IL = -5mA 1.2 1.3 V 2 VStart Voltage Start-Up VI = 4.25V, RL = 0.833, CL = 20F, IL = -1.5A 1.2 1.3 V 1, 2, 3 Min Max Unit Sub groups IOS Output Short Circuit Current VI = 40V, RL = 250 (Note 8) AC Parameters (Note 11) Symbol Parameter Conditions Notes VNO Output Noise Voltage VI = 6.25V, IL = -100mA 120 VRMS 7 VO / VI Line Transient Response VI = 6.25V, VI = 3V, IL = -10mA (Note 9) 18 mV 7 VO / IL Load Transient Response VI = 6.25V, IL = -400mA, IL = -100mA (Note 10) 120 mV 7 VI / VO Ripple Rejection VI = 6.25V, IL = -500mA, EI = 1VRMS at = 2400Hz dB 4 www.national.com 10 65 RH Electrical Characteristics LM117QML LM117K (Continued) DC Drift Parameters The following conditions apply, unless otherwise specified. Deltas performed on QMLV devices at Group B, Subgroup 5, only. Symbol Parameter Conditions VO Output Voltage Notes Min Max Unit Subgroups VI = 4.25V, IL = -5mA -0.01 0.01 V 1 VI = 4.25V, IL = -1.5A -0.01 0.01 V 1 VI = 41.25V, IL = -5mA -0.01 0.01 V 1 VI = 41.25V, IL = -200mA -0.01 0.01 V 1 VRLine Line Regulation 4.25V VI 41.25V, IL = -5mA -4.0 4.0 mV 1 IAdj Adjust Pin Current VI = 4.25V, IL = -5mA -10 10 A 1 VI = 41.25V, IL = -5mA -10 10 A 1 AC/DC Post Radiation Limits @ +25C (Note 11) Symbol Parameter Conditions Min Max Unit Subgroups VO Output Voltage VI = 4.25V, IL = -5mA Notes 1.2 1.350 V 1 VI = 4.25V, IL = -1.5A 1.2 1.350 V 1 VI = 41.25V, IL = -5mA 1.2 1.350 V 1 VI = 41.25V, IL = -200mA 1.2 1.350 V 1 VRLine Line Regulation 4.25V VI 41.25V, IL = -5mA -25 25 mV 1 VRLoad Load Regulation VI = 6.25V, -1.5A IL -5mA -7.0 7.0 mV 1 VI = 41.25V, -200mA IL -5mA -7.0 7.0 mV 1 dB 4 VI / VO Ripple Rejection VO (Recov) Output Voltage Recovery VI = 6.25V, IL = -500mA EI = 1VRMS at f = 2400Hz 60 VI = 4.25V, RL = 0.833, CL = 20S 1.20 1.350 V 1 VI = 40V, RL = 250 1.20 1.350 V 1 Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. Note 2: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax (maximum junction temperature), JA (package junction to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PDmax = (TJmax - TA)/JA or the number given in the Absolute Maximum Ratings, whichever is lower. "Although power dissipation is internally limited, these specifications are applicable for power dissipations of 2W for the TO39, LCC, and ceramic SOIC packages, and 20W for the TO3 package." Note 3: Human body model, 100 pF discharged through a 1.5 k resistor. Note 4: For the Ceramic SOIC device to function properly, the "Output" and "Output/Sense" pins must be connected on the users printed circuit board. Note 5: The package material for these devices allows much improved heat transfer over our standard ceramic packages. In order to take full advantage of this improved heat transfer, heat sinking must be provided between the package base (directly beneath the die), and either metal traces on, or thermal vias through, the printed circuit board. Without this additional heat sinking, device power dissipation must be calculated using JA, rather than JC, thermal resistance. It must not be assumed that the device leads will provide substantial heat transfer out the package, since the thermal resistance of the leadframe material is very poor, relative to the material of the package base. The stated JC thermal resistance is for the package material only, and does not account for the additional thermal resistance between the package base and the printed circuit board. The user must determine the value of the additional thermal resistance and must combine this with the stated value for the package, to calculate the total allowed power dissipation for the device. Note 6: Guaranteed parameter, not tested. Note 7: Tested @ 25C; guaranteed, but not tested @ 125C & -55C Note 8: Tested @ TA = 125C, correlated to TA = 150C Note 9: SMD limit of 6mV/V is equivalent to 18mV Note 10: SMD limit of 0.3mV/V is equivalent to 120mV Note 11: Pre and post irradiation limits are identical to those listed under AC and DC electrical characteristics except as listed in the "Post Radiation Limits" table. These parts may be dose rate sensitive in a space environment and demonstrate enhanced low dose rate effect. Radiation end point limits for the noted parameters are guaranteed only for the conditions as specified in Mil-Std-883, Method 1019.5, Condition A. Note 12: Low dose rate testing has been performed on a wafer-by-wafer basis, per test method 1019 condition D of MIL-STD-883, with no enhanced low dose rate sensitivity (ELDRS) effect. 11 www.national.com LM117QML Typical Performance Characteristics Output Capacitor = 0F unless otherwise noted Load Regulation Current Limit 20143637 20143638 Adjustment Current Dropout Voltage 20143640 20143639 Temperature Stability Minimum Operating Current 20143641 www.national.com 20143642 12 Ripple Rejection (Continued) Ripple Rejection 20143644 20143643 Ripple Rejection Output Impedance 20143646 20143645 Line Transient Response Load Transient Response 20143647 20143648 13 www.national.com LM117QML Typical Performance Characteristics Output Capacitor = 0F unless otherwise noted LM117QML can cause excessive ringing. This occurs with values between 500 pF and 5000 pF. A 1F solid tantalum (or 25F aluminum electrolytic) on the output swamps this effect and insures stability. Any increase of the load capacitance larger than 10F will merely improve the loop stability and output impedance. Application Hints In operation, the LM117 develops a nominal 1.25V reference voltage, VREF, between the output and adjustment terminal. The reference voltage is impressed across program resistor R1 and, since the voltage is constant, a constant current I1 then flows through the output set resistor R2, giving an output voltage of LOAD REGULATION The LM117 is capable of providing extremely good load regulation but a few precautions are needed to obtain maximum performance. The current set resistor connected between the adjustment terminal and the output terminal (usually 240) should be tied directly to the output (case) of the regulator rather than near the load. This eliminates line drops from appearing effectively in series with the reference and degrading regulation. For example, a 15V regulator with 0.05 resistance between the regulator and load will have a load regulation due to line resistance of 0.05 x IL. If the set resistor is connected near the load the effective line resistance will be 0.05 (1 + R2/R1) or in this case, 11.5 times worse. Figure 2 shows the effect of resistance between the regulator and 240 set resistor. 20143605 FIGURE 1. Since the 100A current from the adjustment terminal represents an error term, the LM117 was designed to minimize IADJ and make it very constant with line and load changes. To do this, all quiescent operating current is returned to the output establishing a minimum load current requirement. If there is insufficient load on the output, the output will rise. 20143606 FIGURE 2. Regulator with Line Resistance in Output Lead EXTERNAL CAPACITORS An input bypass capacitor is recommended. A 0.1F disc or 1F solid tantalum on the input is suitable input bypassing for almost all applications. The device is more sensitive to the absence of input bypassing when adjustment or output capacitors are used but the above values will eliminate the possibility of problems. The adjustment terminal can be bypassed to ground on the LM117 to improve ripple rejection. This bypass capacitor prevents ripple from being amplified as the output voltage is increased. With a 10F bypass capacitor 80dB ripple rejection is obtainable at any output level. Increases over 10F do not appreciably improve the ripple rejection at frequencies above 120Hz. If the bypass capacitor is used, it is sometimes necessary to include protection diodes to prevent the capacitor from discharging through internal low current paths and damaging the device. In general, the best type of capacitors to use is solid tantalum. Solid tantalum capacitors have low impedance even at high frequencies. Depending upon capacitor construction, it takes about 25F in aluminum electrolytic to equal 1F solid tantalum at high frequencies. Ceramic capacitors are also good at high frequencies; but some types have a large decrease in capacitance at frequencies around 0.5MHz. For this reason, 0.01F disc may seem to work better than a 0.1F disc as a bypass. Although the LM117 is stable with no output capacitors, like any feedback circuit, certain values of external capacitance www.national.com With the TO-3 package, it is easy to minimize the resistance from the case to the set resistor, by using two separate leads to the case. However, with the TO-39 package, care should be taken to minimize the wire length of the output lead. The ground of R2 can be returned near the ground of the load to provide remote ground sensing and improve load regulation. PROTECTION DIODES When external capacitors are used with any IC regulator it is sometimes necessary to add protection diodes to prevent the capacitors from discharging through low current points into the regulator. Most 10F capacitors have low enough internal series resistance to deliver 20A spikes when shorted. Although the surge is short, there is enough energy to damage parts of the IC. When an output capacitor is connected to a regulator and the input is shorted, the output capacitor will discharge into the output of the regulator. The discharge current depends on the value of the capacitor, the output voltage of the regulator, and the rate of decrease of VIN. In the LM117, this discharge path is through a large junction that is able to sustain 15A surge with no problem. This is not true of other types of positive regulators. For output capacitors of 25F or less, there is no need to use diodes. The bypass capacitor on the adjustment terminal can discharge through a low current junction. Discharge occurs 14 When a value for (H-A) is found using the equation shown, a heatsink must be selected that has a value that is less than or equal to this number. (H-A) is specified numerically by the heatsink manufacturer in the catalog, or shown in a curve that plots temperature rise vs power dissipation for the heatsink. (Continued) when either the input or output is shorted. Internal to the LM117 is a 50 resistor which limits the peak discharge current. No protection is needed for output voltages of 25V or less and 10F capacitance. Figure 3 shows an LM117 with protection diodes included for use with outputs greater than 25V and high values of output capacitance. 20143607 D1 protects against C1 D2 protects against C2 FIGURE 3. Regulator with Protection Diodes Typical Applications 5V Logic Regulator with Electronic Shutdown* Slow Turn-On 15V Regulator 20143609 20143603 *Min. output ) 1.2V Adjustable Regulator with Improved Ripple Rejection 20143610 Solid tantalum *Discharges C1 if output is shorted to ground 15 www.national.com LM117QML Application Hints LM117QML Typical Applications (Continued) High Stability 10V Regulator 20143611 High Current Adjustable Regulator 20143612 Optional -- improves ripple rejection Solid tantalum *Minimum load current = 30 mA www.national.com 16 (Continued) LM117QML Typical Applications Power Follower 0 to 30V Regulator 20143614 20143613 Full output current not available at high input-output voltages 5A Constant Voltage/Constant Current Regulator 20143615 Solid tantalum *Lights in constant current mode 17 www.national.com LM117QML Typical Applications (Continued) High Gain Amplifier 1A Current Regulator 20143616 1.2V-20V Regulator with Minimum Program Current 20143618 20143617 *Minimum load current ) 4 mA Low Cost 3A Switching Regulator 20143619 Solid tantalum *Core -- Arnold A-254168-2 60 turns www.national.com 18 LM117QML Typical Applications (Continued) 4A Switching Regulator with Overload Protection 20143620 Solid tantalum *Core -- Arnold A-254168-2 60 turns Precision Current Limiter 20143621 Tracking Preregulator 20143622 19 www.national.com LM117QML Typical Applications (Continued) Current Limited Voltage Regulator 20143623 (Compared to LM117's higher current limit) -- At 50 mA output only 34 volt of drop occurs in R3 and R4 Adjusting Multiple On-Card Regulators with Single Control* 20143624 *All outputs within 100 mV Minimum load -- 10 mA www.national.com 20 LM117QML Typical Applications (Continued) AC Voltage Regulator 20143625 12V Battery Charger 20143626 Use of RS allows low charging rates with fully charged battery. 50mA Constant Current Battery Charger 20143627 21 www.national.com LM117QML Typical Applications (Continued) Current Limited 6V Charger Adjustable 4A Regulator 20143629 *Sets peak current (0.6A for 1) **The 1000F is recommended to filter out input transients Digitally Selected Outputs 20143628 1.2V-25V Adjustable Regulator 20143602 *Sets maximum VOUT 20143601 Full output current not available at high input-output voltages *Needed if device is more than 6 inches from filter capacitors. Optional -- improves transient response. Output capacitors in the range of 1F to 1000F of aluminum or tantalum electrolytic are commonly used to provide improved output impedance and rejection of transients. www.national.com 22 LM117QML Revision History Date Released Revision Section 03/17/06 A New Release to corporate format 06/29/06 B Features, Ordering Information Table, Rad Hard Electrical Section for H and WG packages and Notes 23 Originator Changes L.Lytle 5 MDS data sheets were consolidated into one corporate data sheet format. Clarified IAdj/ Line versus IAdj/ Load by separating the parameters in all of the tables. MNLM117-K Rev 1C1, MNLM117-X Rev 0A0, MNLM117-E Rev 0B1, MRLM117-X-RH Rev 2A0, MRLM117-K-RH Rev 3A0 will be archived. R. Malone Deleted NSID LM117WGRQML, no longer available. Added Available with Radiation Guarantee, Low Dose NSID's to table 5962R9951705VXA LM117HRLQMLV, 5962R9951705VZA LM117WGRLQMLV, and reference to Note 11 and 12. Note 12 to Rad Hard Electrical Heading for H and WG packages. Note 12 to Notes. Archive Revision A. www.national.com LM117QML Physical Dimensions inches (millimeters) unless otherwise noted (TO-39) Metal Can Package NS Package Number H03A TO-3 Metal Can Package (K) NS Package Number K02C www.national.com 24 LM117QML Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Ceramic Leadless Chip Carrier NS Package Number E20A Ceramic SOIC NS Package Number WG16A 25 www.national.com LM117QML 3-Terminal Adjustable Regulator Notes National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. For the most current product information visit us at www.national.com. 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