LM145 NSC | Alldatasheet

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Features

Y Output voltage accurate to better than g2% Y Current limit constant with temperature Y Internal thermal shutdown protection Y Operates with input-output voltage differential of 2.8V at full rated load over full temperature range Y Regulation guaranteed with 25W power dissipation Y 3A output current guaranteed Y Only one external component needed Y Pa Product Enhancement tested Schematic Diagram TL/H/7785–1 C1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/Distributors for availability and specifications. (Note 3) Input Voltage 20V Input-Output Differential 20V Power Dissipation Internally Limited Operating Junction Temperature Range LM145 b55§Ct o a150§C LM345 0 §Ct o a125§C Storage Temperature Range b65§Ct o a150§C Lead Temperature (Soldering, 10 sec.) 300 §C Electrical Characteristics (Note 1) Limits Parameter Conditions LM145 LM345 Units Min Typ Max Min Typ Max Line Regulation (Note 2) T j e 25§C 5 15 5 25 mVb20V s VIN s b7.5V Load Regulation (Note 2) T j e 25§C, V IN eb 7.5V 30 75 30 100 mV5m A s IOUT s 3A Output Voltage b20V s VIN s b7.8V 5m A s IOUT s 3A P s 25W b5.20 b4.80 b5.25 b4.75 V TMIN s Tj s TMAX Short Circuit Current V IN eb 7.5V, T j ea 25§C 4 5.5 4 5.5 A VIN eb 20V, T j ea 25§C 2 3.5 2 3.5 A Output Noise Voltage T A e 25§C, C L e 4.7 mF 150 150 mV10 Hz s f s 100 kHz Long Term Stability 5 50 5 50 mV Thermal Resistance 22 §C/WJunction to Case Note 1: Unless otherwise specified, these specifications apply: b55§C s Tj s a150§C for the LM145 and 0 §C s Tj s a125§C for the LM345. V IN e 7.5V and IOUT e 5 mA. Although power dissipation is internally limited, electrical specifications apply only for power levels up to 25W. For calculations of junction temperature rise due to power dissipation, use a thermal resistance of 35 §C/W for the TO-3 with no heat sink. With a heat sink, use 2 §C/W for junction to case thermal resistance. Note 2: Regulation is measured at constant junction temperature. Changes in output voltage due to heating effects must be taken into account separately. To ensure constant junction temperature, pulse testing with a low duty cycle is used. Note 3: Refer to RETS145K-5V for LM145K-5.0 military specifications. Connection Diagram Metal Can Package TL/H/7785–2 Bottom View Order Number LM345K-5.0 See NS Package Number K02A Order Number LM145K-5.0/883 or SMD Ý5962-9064501 See NS Package Number K02C Typical Applications Fixed Regulator TL/H/7785–3 ²Required for stability. For value given, capacitor must be solid tantalum. 50 mF aluminum electrolytic may be substituted. Values given may be in- creased without limit. *Required if regulator is separated from filter capacitor. For value given, ca- pacitor must be solid tantulum. 50 mF aluminum electrolytic may be substi- tuted.

Typical Performance Characteristics Dissipation for LM145 Maximum Average Power Dissipation for LM345 Maximum Average Power Ripple Rejection Output Impedance Voltage Differential Minimum Input-Output Temperature Output Voltage vs TL/H/7785–4 Typical Applications (Continued) TL/H/7785–5 *Select resistors to set output voltage. 1 ppm/C tracking suggested. **C1 is not needed if power supply filter capacitor is within 3 × of regulator. ²Determines zener current. May be adjusted to minimize temperature drift. ²² Solid tantalum. Load and line regulation k 0.01% Temperature drift k 0.001%/C

Typical Applications (Continued) High Stability Regulator TL/H/7785–6 C1 is not needed if power supply filter capacitor is within 3 × of regulator. ²Keep C4 within 2 × of LM345. D2 sets initial output voltage accuracy. The LM113 is available in b5, b2, and b1% tolerance. b2V ECL Termination Regulator Dual 3 Amp Trimmed Supply TL/H/7785–7 Variable Output ( b5.0V to b15V) TL/H/7785–8 *Optional. Improves transient VOUT eb 5V R1 a R2 R2 Jresponse and ripple rejection.

Physical Dimensions inches (millimeters) Metal Can Package (K) Order Number LM345K-5.0

LM145/LM345 Negative Three Amp Regulator Physical Dimensions inches (millimeters) (Continued) Metal Can Package (K) Mil-Aero Products Order Number LM145K-5.0/883 or SMD Ý5962-9064501 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 OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or 2. A critical component is any component of a life systems which, (a) are intended for surgical implant support device or system whose failure to perform can into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life failure to perform, when properly used in accordance support device or system, or to affect its safety or with instructions for use provided in the labeling, can effectiveness. be reasonably expected to result in a significant injury to the user. National Semiconductor National Semiconductor National Semiconductor National Semiconductor Corporation Europe Hong Kong Ltd. Japan Ltd.

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