LM368H-2.5

LM368-2 5 Precision Voltage Reference December 1994 LM368-2 5 Precision Voltage Reference General Description The LM368-2 5 is a precision monolithic temperature-compensated voltage reference The LM368-2 5 makes use of thin-film technology enhanced by the discrete laser trimming of resistors to achieve excellent Temperature coefficient (Tempco) of VOUT (as low as 11 ppm C) along with tight initial tolerance (as low as 0 02%) The trim scheme is such that individual resistors are cut open rather than being trimmed (partially cut) to avoid resistor drift caused by electromigration in the trimmed area The LM368-2 5 also provides excellent stability vs changes in input voltage and output current The output is short circuit proof A trim pin is made available for fine trimming of VOUT or for obtaining intermediate values without greatly affecting the Tempco of the device Features Y Y Y Y Y Y Y Y 400 mA operating current Low output impedance Excellent line regulation ( 0001% V typical) Single-supply operation Externally trimmable Low temperature coefficient Excellent initial accuracy (0 02% typical) Best reference available for low-voltage operation (VS e 5V VREF e 2 500V) Connection Diagram Metal Can Package (TO-5) TL H 8446 – 1 Top View case connected to Vb Order Number LM368H-2 5 LM368YH-2 5 See NS Package Number H08C Typical Applications Low Voltage Reference TL H 8446 – 2 C1995 National Semiconductor Corporation TL H 8446 RRD-B30M115 Printed in U S A Absolute Maximum Ratings (Note 7) If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Input Voltage Power Dissipation Storage Temperature Range Operating Temperature Range 35V 600 mW b 60 C to a 150 C 0 C to a 70 C Soldering Information TO-5 (H) Package (10 sec ) a 300 C See AN-450 ‘‘Surface Mounting Methods and Their Effect on Product Reliability’’ (Appendix D) for other methods of soldering surface mount devices Electrical Characteristics (Note 1) LM368-2 5 Parameter Conditions Typical g 0 02 Tested Limit (Note 2) g0 2 g 0 0005 g 0 0025 g 0 02 Design Limit (Note 3) Units (Max unless noted) % %V % mA % 100 mW mA mA V ppm C ppm C mA uVp-p nV 0Hz VOUT Error LM368 Line Regulation Load Regulation (Note 8) Thermal Regulation Quiescent Current Change of Quiescent Current vs VIN Temperature Coefficient of VOUT (see graph) LM368Y-2 5 (Note 5) LM368-2 5 Short Circuit Current Noise 0 1 – 10 Hz 100 Hz –10 kHz 0 s VPIN5 s VOUT 5 0V s VIN s 30V 0 C s TA s 70 C 0 C s TA s 70 C VOUT e 0 5 0V s VIN s 30V 0 mA s ISOURCE s 10 mA T e 20 mS (Note 4) g 0 0001 g 0 0003 g 0 005 350 3 g 11 g 15 550 5 g 20 g 30 30 12 420 1 9–5 2 70 100 VOUT Adjust Range 2 2–5 0 V min Note 1 Unless otherwise noted these specifications apply TA e 25 C 4 9V s VIN s 10 5V 0 s ILOAD s 0 5 mA 0 s CL s 200 pF Note 2 Tested Limits are guaranteed and 100% tested in production Note 3 Design Limits are guaranteed (but not 100% production tested) over the indicated temperature and supply voltage ranges These limits are not used to calculate outgoing quality levels Note 4 Thermal Regulation is defined as the change in the output Voltage at a time T after a step change in power dissipation of 100 mW Note 5 Temperature Coefficient of VOUT is defined as the worst case delta-VOUT measured at Specified Temperatures divided by the total span of the Specified Temperature Range (See graphs) There is no guarantee that the Specified Temperatures are exactly at the minimum or maximum deviation Note 6 In metal can (H) iJ-C is 75 C W and iJ-A is 150 C W Note 7 Absolute Maximum Ratings indicate limits beyond which damage to the device may occur DC and AC electrical specifications do not apply when operating the device beyond its Rated Operating Conditions (see Note 1 and Conditions) Note 8 Load regulation is measured on the output pin at a point below the base of the package Regulation is measured at constant junction temperature using pulse testing with a low duty cycle Changes in output voltage due to heating effects are covered under the specification for thermal regulation 2 Typical Performance Characteristics (Note 1) Quiescent Current vs Input Voltage and Temperature Dropout Voltage vs Output Current Output Change vs Output Current Output Impedance vs Frequency Ripple Rejection vs Frequency (1) LM368 as is (2) with 0 01 mf Mylar Trim to Gnd (3) with 10X in series with 10 mf VOUT to Gnd (4) with Both Temperature Coefficient LM368-2 5 (Curve A) Output Noise vs Frequency Typical Temperature Coefficient Calculations LM368-2 5 (see Curve A) T C e 1 7 mV (70 c 2 5V) e 9 7 ppm C TL H 8446 – 3 3 Typical Applications Wide Range Trimmable Regulator Narrow Range Trimmable Regulator ( g 1% min ) TL H 8446–5 TL H 8446 – 6 Improved Noise Performance TL H 8446 – 7 g 2 5V g 1 25V References e LM324A or LM358A TL H 8446 – 8 Re Thin Film Resistor Network g 0 05% Matching and 5 ppm Tracking (Beckman 694-3-R-10K-A) (Caddock T-914-10K-100-05) or similar 4 Typical Applications (Continued) Multiple Output Voltages TL H 8446 – 9 TL H 8446 – 10 R e Thin Film Resistor Network 0 05% Matching and 5 ppm Tracking (Beckman 694-3-R-10K-A) (Caddock T-914-10K-100-05) or similar Reference with Booster 100 mA Boosted Reference TL H 8446 – 11 TL H 8446 – 12 5 Typical Applications (Continued) Buffered High-Current Reference with Filter TL H 8446 – 13 Simplified Schematic Diagram TL H 8446 – 14 Reg U S Pat Off 6 7 LM368-2 5 Precision Voltage Reference Physical Dimensions inches (millimeters) Lit 106560 Metal Can Package (H) Order Number LM368H-2 5 or LM368YH-2 5 NS Package Number H08C This data sheet contains preliminary limits and design specifications Supplemental information will be published at a later date National Semiconductor reserves the right to make changes in the products contained in this document in order to improve design or performance and to supply the best possible products National also assumes no responsibility for the use of any circuits described herein conveys no license under any patent or other right and makes no representations that the circuits are free from patent infringement Applications for any integrated circuits contained in this document are for illustration purposes only and National makes no representation or warranty that such applications will be suitable for the use specified without further testing or modification 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 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 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