105 205 305/305A Positive Voltage Regulators GENERAL DESCRIPTION The LM105 series are positive voltage regulators, each con- structed on a silicon chip by the planar epitaxial process. They are similar to the LM100, except for an extra gain stage to improve regulation. In both linear and switching regulator circuits with outputs greater than 4.5V, these devices are direct plug-in replacements for the LM100. The LM105 military version operates from 55C to +125C, The LM305/LM305A are commercial versions which operate from 0C to +70C. These regulators feature fast response to load and line tran- sients, freedom from oscillations with varying resistive and reactive loads, and reliable starts on any load within ratings. The LM205 is the same as the LM105 except its performance is guaranteed from 25C to +85C. DESIGN FEATURES @ Output Voltage Adjustable from 4.5V to 40V @ Output Currents in Excess of 10A by Adding External Transistors @ Load Regulation Better Than 0.1%, Full Load With Current Limiting DC Line Regulation Guaranteed at 0,03%/V @ Ripple Rejection of 0.01%/V @ 45mA Output Current Without External Pass Transistor SCHEMATIC DIAGRAM TYPICAL APPLICATIONS UNREGULATED INPUT Switching Regulator BOOSTER OUTPUT R4 == 17 mH 2M ? Vout 5V CURRENT LIMIT o1 R3 RI C1 UTX210 10 . = REGULATEO OUTPUT 8 a 7 02 atut 1 6 $ o1 | 35V COMPENSATION SHUTDOWN 2 RC305A , = ut = 2N4032 2 4 a? ~*~ c3_) 32k = 1007 1% Vin BV pF { FEEDBACK = Sf tSolid tantalum REFERENCE BYPASS $125 turns = 22 on Arnold Engineering $ A262123-2 molybdenum permalloy core O GROUND CONNECTION INFORMATION 10A Regulator with Foldback Current Limiting TE Metal Can Package + v 5 (Top View) ci = a a3 pam our Y REGULATED douF a3 e 68 a6 TS OUTPUT 15 12 Lay SFA Fav CURRENT comp + og 94? cit SHUTDOWN 7 a IN3445 ay , . ay 7 Re OE @ |Feeowack ae 315K tae Lom UNREGULATED @ @ REFERENCE Dane VIN Ae = INPUT BYPASS 168 GRouno (CASE) Order Part Nos.: LM105H, |.M205H, tM305H, |.M305AH +Solid tanta um "Electrol stic 3-2Positive Voltage Regulators ABSOLUTE MAXIMUM FIATINGS 105 205 305/305A Input Voltage ....... LM105, LM205, LM305A: 50V Operating Temperature Range > 5 LM305: 40V LM105 2. cee ee ee -55C to +150C Input-Output Voltage Differential ............- 40V LM205 1.0... eee -25C to +85C Power Dissipation (Note 1) LM305/305A 2... ee eee 0C to +70C LM105, LM205, LM305A .............6- 800mWw Storage Temperature Range ........ ~65C to +150C LM305 .0 0. ee ee eee 500mWw Lead Temperature {Soldering, 10s} ..........- 300C ELECTRICAL CHARACTERISTICS (note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS Input Voltage Range LM105/205/305A 8.5 50 Vv LM305 8.5 40 Output Voltage Range LM105/205/305A 4.5 40 Vv LM305 4.5 30 Output-Input Voltage Differential 3.0 30 Vv Load Regulation (Note 3)} LM105 0<1i9 <12mMA Rsc = 102, Ta = 25C 0.02 | 0.05 Rsc = 102, Ta = 125C 0.03 0.1 % Rsc = 109, Ta = -55C 0.03 0.1 LM205 0<19 <12mA Rsc = 109, Ta = 25C 0.02 | 0.05 Rsc =109, Ta = 85C 0.03 0.1 % Rsc = 102, Ta = -25C 0.03 0.1 LM305A 0<1Q9 <45mA Rsc = 02, Ta = 25 C 0.02 0.2 Rsc = 02, Ta = 70C 0.03 | 0.4 % Rsc = 02, Ta = 0C 0.03 0.4 LM305 0 5V 0.015 | 0.03 Ripple Rejection Cree = 10uF, F = 120H2 0.003 | 0.01 %/V Temperature Stability LM105 -68 C0.1uF 0.002 Standby Current Drain | LM305 VIN = 40V 0.8 2.0 | LM105/205/305A | Vin = 50V 0.8 2.0 mA Long Term Stability 0.1 1.0 % NOTES: 4. The maximum junction temperature of the LM105 is 150C and 85C for the LM30S. For operating at elevated temperatures, devices in the TO-5 package must be derated based on a thermal resistance of 150C/W junction to ambient, or 45C/W junction to case. For the flat package, the derating is based on a thermal resistance of 185C/W when mounted on a 1/16-inch thick epoxy glass board with ten, 0.03-inch-wide, 2-ounce copper conductors. Peak dissipations to 1W are allowable providing the dissipation rating is not exceeded with the power averaged over a five second interval, for the LM105, and averaged over a two second inverval for the LM305. N These specifications apply for input and output voltages within the ranges given, and for a divider impedance seen py the feedback terminal of 2k, unless otherwise specified. The load and line regulation specifications are for constant junction temperature. Temperature drift effects must be taken into account separately when the unit is operating under conditions of high dissipation. w be roughly equal to the composite current gain of the added transistors. 5 No external pass transistor. The output currents given, as well as the foad regulation, can be increased by the addition of external transistors. The improvement factor will 3-3