LM105/LM305/LM305A Voltage Regulators General Description The LM105 series are positive voltage regulators similar to the LM100, except that an extra gain stage has been added for improved regulation. A redesign of the biasing circuitry removes any minimum load current requirement and at the same time reduces standby current drain, permitting higher voltage operation. They are direct, plug-in replacements for the LM100 in both linear and switching regulator circuits with output voltages greater than 4.5V. Important characteristics of the circuits are: • • Output voltage adjustable from 4.5V to 40V Output currents in excess of 10A possible 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 on 0.01%V 45 mA output current without external pass transistor (LM305A) Like the LM100, they also feature fast response to both load and line transients, freedom from oscillations with varying resistive and reactive loads and the ability to start reliably on any load within rating. The circuits are built on a single silicon chip and are supplied in a TO-99 metal can. The LM105 is specified for operation for −55˚C ≤ TA ≤ +125˚C, and the LM305/LM305A is specified for 0˚C ≤ TA ≤ +70˚C. Schematic and Connection Diagrams Metal Can Package DS007755-3 Top View Order Number LM105H, LM105H/883, SMD #5962-8958801, LM305H or LM305AH See NS Package Number H08C DS007755-1 © 1999 National Semiconductor Corporation DS007755 www.national.com LM105/LM305/LM305A Voltage Regulators June 1999 Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. (Note 5) Input Voltage Input-Output Differential Power Dissipation (Note 1) Operating Temperature Range Storage Temperature Range Lead Temperature (Soldering, 10 seconds) LM105 50V 40V 800 mW −55˚C to +125˚C −65˚C to +150˚C 300˚C LM305 40V 40V 800 mW 0˚C to +70˚C 65˚C to +150˚C 300˚C LM305A 50V 40V 800 mW 0˚C to +70˚C −65˚C to +150˚C 300˚C Electrical Characteristics (Note 2) Parameter Conditions LM105 Min Typ LM305 Max Min Typ LM305A Max Min Typ Units Max Input Voltage Range 8.5 50 8.5 40 8.5 50 V Output Voltage Range 4.5 40 4.5 30 4.5 40 V Input-Output Voltage 3.0 30 3.0 30 3.0 30 V Differential Load Regulation (Note 3) RSC = 10Ω, TA = 25˚C RSC = 10Ω, TA = TA(MAX) RSC = 10Ω, TA = TA(MIN) 0.02 0.05 0.02 0.05 % 0.03 0.1 0.03 0.1 % 0.03 0.1 0.03 0.1 % 0 ≤ IO ≤ 12 mA 0 ≤ IO ≤ 12 mA RSC = 0Ω, TA = 25˚C RSC = 0Ω, TA = 70˚C RSC = 0Ω, TA = 0˚C 0.02 0.2 % 0.03 0.4 % 0.03 0.4 % 0 ≤ IO ≤ 45 mA Line Regulation TA = 25˚C %/V 0˚C ≤ TA ≤ +70˚C %/V VIN − VOUT ≤ 5V, TA = 25˚C VIN − VOUT ≥ 5V, TA = 25˚C Temperature Stability 0.025 0.06 0.025 0.06 %/V 0.03 0.015 0.03 0.015 0.03 %/V 0.3 1.0 0.3 1.0 0.3 1.0 % 1.7 1.81 1.63 1.7 1.81 1.55 1.7 1.85 V 1.63 10 Hz ≤ f ≤ 10 kHz CREF = 0 Standby Current Drain CREF = 0.1 µF VIN = 30V, TA = 25˚C VIN = 40V Current Limit VIN = 50V TA = 25˚C, RSC = 10Ω, VOUT = 0V, (Note 4) Sense Voltage 0.06 0.015 TA(MIN) ≤ TA ≤ TA(MAX) Feedback Sense Voltage Output Noise Voltage 0.025 0.005 0.005 0.005 0.002 0.002 0.002 θJA % mA 0.8 225 Long Term Stability Ripple Rejection % CREF = 10 µF, f = 120 Hz TO-99 Board Mount 0.8 2.0 300 375 225 300 2.0 375 mA 225 0.8 2.0 mA 300 375 mV 0.1 0.1 0.1 % 0.003 0.003 0.003 %/V 230 230 230 ˚C/W 92 92 92 ˚C/W 25 25 25 ˚C/W in Still Air θJA TO-99 Board Mount in 400 LF/Min Air Flow θJC www.national.com TO-99 2 Electrical Characteristics (Note 2) (Continued) Note 1: The maximum junction temperature of the LM105 and LM305A is 150˚C, and the LM305 is 85˚C. For operation at elevated temperatures, devices in the H08C package must be derated based on a thermal resistance of 168˚C/W junction to ambient, or 25˚C/W junction to case. Peak dissipations to 1W are allowable providing the dissipation rating is not exceeded with the power average over a five second interval for the LM105 and averaged over a two second interval for the LM305. Note 2: Unless otherwise specified, these specifications apply for temperatures within the operating temperature range, for input and output voltages within the range given, and for a divider impedance seen by the feedback terminal of 2 kΩ. Load and line regulation specifications are for a constant junction temperature. Temperature drift effects must be taken into account separately when the unit is operating under conditions of high dissipation. Note 3: The output currents given, as well as the load regulation, can be increased by the addition of external transistors. The improvement factor will be roughly equal to the composite current gain of the added transistors. Note 4: With no external pass transistor. Note 5: Refer to RETS105X Drawing for military specifications for the LM105. Typical Performance Characteristics Load Regulation Load Regulation Current Limiting Characteristics DS007755-16 DS007755-15 DS007755-17 Current Limit Sense Voltage Short Circuit Current Optimum Divider Resistance Values DS007755-19 DS007755-18 DS007755-20 Minimum Input Voltage Regulator Dropout Voltage DS007755-22 DS007755-21 3 Supply Voltage Rejection DS007755-23 www.national.com Typical Performance Characteristics Minimum Output Voltage (Continued) Standby Current Drain Transient Response DS007755-25 DS007755-24 DS007755-26 Typical Applications 10A Regulator with Foldback Current Limiting DS007755-4 †Solid tantalum. *Electrolytic 1.0A Regulator with Protective Diodes DS007755-5 †Protects against shorted input or inductive leads on unregulated supply. *Protects against input voltage reversal. ††Protects against output voltage reversal. www.national.com 4 Typical Applications (Continued) Current Regulator Linear Regulator with Foldback Current Limiting DS007755-8 DS007755-9 Shunt Regulator DS007755-10 Switching Regulator Basic Positive Regulator with Current Limiting DS007755-11 DS007755-12 †Solid tantaium. ††125 turns = 22 on Arnold Engineering A262123-2 molybdenum permally core. 5 www.national.com Typical Applications (Continued) 1.0A Regulator with Protective Diodes DS007755-13 †Protects against shorted input or inductive loads on unregulated supply. *Protects against input voltage reversal. ††Protects against output voltage reversal. Linear Regulator with Foldback Current Limiting DS007755-14 www.national.com 6 LM105/LM305/LM305A Voltage Regulators Physical Dimensions inches (millimeters) unless otherwise noted Metal Can Package (H) Order Number LM105H, LM105H/883, SMD #5962-8958801, LM305H or LM305AH NS Package Number H08C LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 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