LM105 NSC | Alldatasheet

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 7

Technical content

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 re- moves 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 ex- ternal 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 re- sistive 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≤ T A ≤ +125˚C, and the LM305/LM305A is specified for 0˚C≤ TA ≤ +70˚C. Schematic and Connection Diagrams DS007755-1 Metal Can Package DS007755-3 Top View Order Number LM105H, LM105H/883, SMD #5962-8958801, LM305H or LM305AH See NS Package Number H08C June 1999 LM105/LM305/LM305A Voltage Regulators © 1999 National Semiconductor Corporation DS007755 www.national.com

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) LM105 LM305 LM305A Input Voltage 50V 40V 50V Input-Output Differential 40V 40V 40V Power Dissipation (Note 1) 800 mW 800 mW 800 mW Operating Temperature Range −55˚C to +125˚C 0˚C to +70˚C 0˚C to +70˚C Storage Temperature Range −65˚C to +150˚C 65˚C to +150˚C −65˚C to +150˚C Lead Temperature (Soldering, 10 seconds) 300˚C 300˚C 300˚C Electrical Characteristics(Note 2) Parameter Conditions LM105 LM305 LM305A Units Min Typ Max Min Typ Max Min Typ 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 R SC = 10Ω ,TA = 25˚C 0.02 0.05 0.02 0.05 % (Note 3) R SC = 10Ω ,TA = TA(MAX) 0.03 0.1 0.03 0.1 % R SC = 10Ω ,TA = TA(MIN) 0.03 0.1 0.03 0.1 % 0 ≤ IO ≤ 12 mA 0 ≤ IO ≤ 12 mA R SC = 0Ω ,TA = 25˚C 0.02 0.2 % R SC = 0Ω ,TA = 70˚C 0.03 0.4 % R SC = 0Ω ,TA = 0˚C 0.03 0.4 % 0 ≤ IO ≤ 45 mA Line Regulation T A = 25˚C % /V Feedback Sense Voltage Output Noise Voltage 10 Hz ≤ f≤ 10 kHz C REF = 0 0.005 0.005 0.005 % C REF = 0.1 µF 0.002 0.002 0.002 % Standby Current Drain VIN = 30V, TA = 25˚C mA VIN = 40V 0.8 2.0 mA VIN = 50V 0.8 2.0 0.8 2.0 mA Current Limit T A = 25˚C, RSC = 10Ω , 225 300 375 225 300 375 225 300 375 mV Sense Voltage V OUT = 0V, (Note 4) Long Term Stability 0.1 0.1 0.1 % Ripple Rejection C REF = 10 µF, f= 120 Hz 0.003 0.003 0.003 % /V θJA TO-99 Board Mount 230 230 230 ˚C/W in Still Air θ JA TO-99 Board Mount in 92 92 92 ˚C/W

400 LF/Min Air Flow

θ JC TO-99 25 25 25 ˚C/W www.national.com 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. Tem- perature 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 DS007755-15 Load Regulation DS007755-16 Current Limiting Characteristics DS007755-17 Current Limit Sense Voltage DS007755-18 Short Circuit Current DS007755-19 Optimum Divider Resistance Values DS007755-20 Minimum Input Voltage DS007755-21 Regulator Dropout Voltage DS007755-22 Supply Voltage Rejection DS007755-23 www.national.com3

Typical Performance Characteristics(Continued) Typical Applications Minimum Output Voltage DS007755-24 Standby Current Drain DS007755-25 Transient Response DS007755-26 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) Linear Regulator with Foldback Current Limiting DS007755-8 Current Regulator DS007755-9 Shunt Regulator DS007755-10 Switching Regulator DS007755-11 †Solid tantaium. ††125 turns=22 on Arnold Engineering A262123-2 molybdenum permally core. Basic Positive Regulator with Current Limiting DS007755-12 www.national.com5

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

Physical Dimensionsinches (millimeters) unless otherwise noted 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. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com National Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 1 80-530 85 85 English Tel: +49 (0) 1 80-532 78 32 Français Tel: +49 (0) 1 80-532 93 58 Italiano Tel: +49 (0) 1 80-534 16 80 National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: sea.support@nsc.com National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 www.national.com Metal Can Package (H) Order Number LM105H, LM105H/883, SMD #5962-8958801, LM305H or LM305AH LM105/LM305/LM305A Voltage Regulators 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.