LM368-5.0 and LM368-10 Precision Voltage References General Description Features The LM368 is a precision, monolithic, temperature-compensated voltage reference. The LM368 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 5ppm/§ 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 also provides excellent stability vs. changes in input voltage and output current (both sourcing and sinking). This device is available in output voltage options of 5.0V and 10.0V and will operate in both series or shunt mode. Also see the LM368-2.5 data sheet for a 2.5V output. The devices are short circuit proof when sourcing current. A trim pin is made available for fine trimming of VOUT or for obtaining intermediate values without greatly affecting the Tempco of the device. Y Y Y Y Y Y Y Y Y 300 mA operating current Low output impedance Excellent line regulation (.0001%/V typical) Single-supply operation Externally trimmable Low temperature coefficient Operates in series or shunt mode 10.0V or 5.0V Excellent initial accuracy (0.02% typical) Connection Diagram Metal Can Package TL/H/5522 – 1 Top View *case connected to Vb Order Number LM368YH-10, LM368YH-5.0, LM368H-10, LM368H-5.0 See NS Package Number H08C Typical Applications Series Regulator Shunt Regulator TL/H/5522– 2 TL/H/5522 – 3 C1995 National Semiconductor Corporation TL/H/5522 RRD-B30M115/Printed in U. S. A. LM368-5.0 and LM368-10 Precision Voltage References January 1995 Absolute Maximum Ratings (Note 8) Input Voltage (Series Mode) Power Dissipation Storage Temperature Range Operating Temperature Range LM368 Soldering Information TO-5 (H) Package, 10 sec. 35V Reverse Current (Shunt Mode) 50 mA 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. 600 mW b 60§ C to a 150§ C 0§ C to a 70§ C Electrical Characteristics (Note 1) LM368 Parameter Conditions VOUT Error Typical Tested Limit (Note 2) Design Limit (Note 3) Units (Max. unless noted) g 0.02 g 0.1 % Line Regulation (VOUT a 3V) s VIN s 30V g 0.0001 g 0.0005 %/V Load Regulation (Note 4) 0 mA s ISOURCE s 10 mA b 10 mA s ISINK s 0 mA g 0.0003 g 0.001 g 0.003 g 0.008 %/mA %/mA Thermal Regulation T e 20 mS (Note 5) g 0.005 g 0.01 %/100 mW 250 350 mA 3 5 mA/V g 11 g 20 Quiescent Current Change of Quiescent Current vs. VIN (VOUT a 3V) s VIN s 30V Temperature Coefficient of VOUT (see graph): LM368Y (Note 6) LM368 0§ C s TA s 70§ C 0§ C s TA s 70§ C Short Circuit Current VOUT e 0 Noise: g 15 30 10.0V: 0.1 - 10Hz 100Hz - 10 kHz 6.2V: 0.1 - 10Hz 100Hz - 10 kHz 5.0V: 0.1 - 10Hz 100Hz - 10 kHz VOUT Adjust Range: 10.000V 5.000V 70 g 30 ppm/§ C ppm/§ C 100 mA 30 1100 20 700 16 575 0V s VPIN5 s VOUT 4.5-17.0 4.4-7.0 uVp-p nV/0Hz uVp-p nV/0Hz uVp-p nV/0Hz 6.0-15.5 4.5-6.0 V min. V min. Note 1: Unless otherwise noted, these specifications apply: TA e 25§ C, VIN e 15V, ILOAD e 0, 0 s CL s 200 pF, Circuit is operating in Series Mode. Or, circuit is operating in Shunt Mode, VIN e a 15V or VIN e VOUT, TA e a 25§ C, ILOAD e b 1.0 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: The LM368 has a Class B output, and will exhibit transients at the crossover point. This point occurs when the device is asked to sink approximately 120 mA. In some applications it may be advantageous to preload the output to either VIN or Ground, to avoid this crossover point. Note 5: 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 6: 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 7: In metal can (H), iJ–C is 75§ C/W and iJ–A is 150§ C/W. Note 8: 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). 2 Typical Performance Characteristics (Note 1) Quiescent Current vs. Input Voltage and Temperature Dropout Voltage vs. Output Current (Series Mode Sourcing Current) Output Change vs. Output Current Output Impedance vs. Frequency (Sourcing Current) Ripple Rejection vs. Frequency Output Impedance vs. Frequency (Sinking Current) Temperature Coefficient: LM368-10 (Curve A) Typical Temperature Coefficient Calculations: LM368-10 (see Curve A) T.C. e 7.7 mV/(70§ c 10V) e 11 c 10E-6 e 11ppm/§ C Output Noise vs. Frequency (1) LM368 alone. (2) with 0.01 mf Mylar, Trim to Gnd. (3) with 10X in series with 10 mf, VOUT to Gnd. (4) with Both. TL/H/5522 – 5 3 TL/H/5522 – 4 Typical Applications Wide Range Trimmable Regulator Narrow Range Trimmable Regulator ( g 1% min.) TL/H/5522–7 TL/H/5522 – 8 Improved Noise Performance Adjustable Zener TL/H/5522 – 10 g 10V, g 5V References TL/H/5522–9 g Reference e (/4 LF444A or (/2 LF412A TL/H/5522 – 12 Re TL/H/5522–11 4 Thin Film Resistor Network, g 0.05% Matching and 5ppm Tracking (Beckman 694-3-R-10K-A), (Caddock T-914-10K-100-05) or similar. Typical Applications (Continued) Multiple Output Voltages TL/H/5522 – 14 TL/H/5522 – 13 Re Thin Film Resistor Network 0.05% Matching and 5ppm Tracking (Beckman 694-3-R-10K-A), (Caddock T-914-10K-100-05) or similar. TL/H/5522 – 15 Reference with Booster 100 mA Boosted Reference TL/H/5522 – 16 TL/H/5522 – 17 5 Typical Applications (Continued) Buffered High-Current Reference with Filter TL/H/5522 – 18 Simplified Schematic Diagram TL/H/5522 – 6 *Reg. U.S. Pat. Off. 6 7 LM368-5.0 and LM368-10 Precision Voltage References Physical Dimensions inches (millimeters) Thermal resistance is 45§ C/W, junction to case, and 150§ C/W, junction to still air. Metal Can Package (H) Order Number LM368YH-10, LM368YH-5.0, LM368H-10, LM368H-5.0 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 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. National Semiconductor Corporation 1111 West Bardin Road Arlington, TX 76017 Tel: 1(800) 272-9959 Fax: 1(800) 737-7018 2. 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