LM4041 Precision Micropower Shunt Voltage Reference General Description Key Specifications (LM4041-1.2) Ideal for space critical applications, the LM4041 precision voltage reference is available in the sub-miniature SC70 and SOT-23 surface-mount packages. The LM4041’s advanced design eliminates the need for an external stabilizing capacitor while ensuring stability with any capacitive load, thus making the LM4041 easy to use. Further reducing design effort is the availability of a fixed (1.225V) and adjustable reverse breakdown voltage. The minimum operating current is 60 µA for the LM4041-1.2 and the LM4041-ADJ. Both versions have a maximum operating current of 12 mA. The LM4041 utilizes fuse and zener-zap reverse breakdown or reference voltage trim during wafer sort to ensure that the prime parts have an accuracy of better than ± 0.1% (A grade) at 25˚C. Bandgap reference temperature drift curvature correction and low dynamic impedance ensure stable reverse breakdown voltage accuracy over a wide range of operating temperatures and currents. j Output voltage tolerance Features n n n n Small packages: SOT-23, TO-92, and SC70 No output capacitor required Tolerates capacitive loads Reverse breakdown voltage options of 1.225V and adjustable ± 0.1%(max) (A grade, 25˚C) j Low output noise (10 Hz to 10kHz) 20µVrms j Wide operating current range 60µA to 12mA j Industrial temperature range −40˚C to +85˚C j Extended temperature range −40˚C to +125˚C j Low temperature coefficient 100 ppm/˚C (max) Applications n n n n n n n Portable, Battery-Powered Equipment Data Acquisition Systems Instrumentation Process Control Energy Management Automotive Precision Audio Components Connection Diagrams SOT-23 SC-70 DS011392-1 *This pin must be left floating or connected to pin 2. DS011392-46 *This pin must be left floating or connected to pin 1. DS011392-40 Top View See NS Package Number MF03A (JEDEC Registration TO-236AB) DS011392-47 Top View See NS Package Number MAA05A © 2001 National Semiconductor Corporation DS011392 www.national.com LM4041 Precision Micropower Shunt Voltage Reference January 2001 LM4041 Connection Diagrams (Continued) TO-92 DS011392-32 DS011392-3 Bottom View See NS Package Number Z03A Ordering Information Reverse Breakdown Voltage Tolerance at 25˚C and Average Reverse Breakdown Voltage Temperature Coefficient Package M3 (SOT-23) Supplied as 1000 Units Tape and Reel M7 (SC70) Supplied as 3000 Units Tape and Reel Supplied as 1000 Units Tape and Reel Z (TO-92) Supplied as 3000 Units Tape and Reel NS Package Number ± 0.1%, 100 ppm/˚C LM4041AIM3-1.2 max (A grade) LM4041AIM3X-1.2 ± 0.2%, 100 ppm/˚C LM4041BIM3-1.2 max (B grade) LM4041BIM3X-1.2 ± 0.5%, 100 ppm/˚C LM4041CEM3-1.2 max (C grade) LM4041CIM3-1.2 LM4041CEM3-ADJ LM4041CIM3-ADJ LM4041CEM3X-1.2 LM4041CIM7-1.2 LM4041CIM7X-1.2 LM4041CIZ-1.2 MF03A, LM4041CIM3X-1.2 LM4041CIM7-ADJ LM4041CIM7X-ADJ LM4041CIZ-ADJ Z03A, LM4041CEM3X-ADJ MAA05A LM4041CIM3X-ADJ ± 1.0%, 150 ppm/˚C LM4041DEM3-1.2 max (D grade) LM4041DIM3-1.2 LM4041DEM3-ADJ LM4041DIM3-ADJ LM4041DEM3X-1.2 LM4041DIM7-1.2 LM4041DIM7X-1.2 LM4041DIZ-1.2 MF03A, LM4041DIM3X-1.2 LM4041DIM7-ADJ LM4041DIM7X-ADJ LM4041DIZ-ADJ Z03A, LM4041DEM3X-ADJ MAA05A LM4041DIM3X-ADJ ± 2.0%, 150 ppm/˚C LM4041EEM3-1.2 max (E grade) LM4041EIM3-1.2 LM4041EEM3X-1.2 LM4041EIM7-1.2 LM4041EIM3X-1.2 LM4041BIM7-1.2 LM4041BIM7X-1.2 LM4041EIM7X-1.2 LM4041AIZ-1.2 MF03A, Z03A LM4041BIZ-1.2 MF03A, Z03A, MAA05A LM4041EIZ-1.2 MF03A, Z03A, MAA05A SOT-23 and SC70 Package Marking Information Only three fields of marking are possible on the SOT-23’s and SC70’s small surface. This table gives the meaning of the three fields. Part Marking R1A (SOT-23 Only) R1B R1C R1D R1E Field Definition First Field: R = Reference Second Field: 1 = 1.225V Voltage Option A = Adjustable Third Field: RAC RAD A–E = Initial Reverse Breakdown Voltage or Reference Voltage Tolerance A = ± 0.1%, B = ± 0.2%, C = ± 0.5%, D = ± 1.0%, E = ± 2.0% www.national.com 2 Soldering (10 seconds) +260˚C ESD Susceptibility Human Body Model (Note 3) 2 kV Machine Model (Note 3) 200V See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” for other methods of soldering surface mount devices. If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Reverse Current Forward Current Maximum Output Voltage (LM4041-ADJ) Power Dissipation (TA = 25˚C) (Note 2) M3 Package Z Package M7 Package Storage Temperature Lead Temperature M3 Packages Vapor phase (60 seconds) Infrared (15 seconds) Z Package 20 mA 10 mA Operating Ratings(Notes 1, 2) 15V (Tmin ≤ TA ≤ Tmax) −40˚C ≤ TA ≤ +85˚C −40˚C ≤ TA ≤ +125˚C Temperature Range Industrial Temperature Range Extended Temperature Range Reverse Current LM4041-1.2 LM4041-ADJ Output Voltage Range LM4041-ADJ 306 mW 550 mW 241mW −65˚C to +150˚C +215˚C +220˚C 60 µA to 12 mA 60 µA to 12 mA 1.24V to 10V LM4041-1.2 Electrical Characteristics (Industrial Temperature Range) Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25˚C. The grades A and B designate initial Reverse Breakdown Voltage tolerances of ± 0.1% and ± 0.2%, respectively. Symbol VR Parameter Conditions Reverse Breakdown Voltage IR = 100 µA Reverse Breakdown Voltage IR = 100 µA Typical (Note 4) ∆VR/∆T ∆VR/∆IR LM4041BIM3 LM4041BIZ LM4041BIM7 Limits (Note 5) Units (Limit) ± 1.2 ± 9.2 ± 2.4 ± 10.4 mV (max) mV (max) 60 60 µA (max) 65 65 µA (max) ± 100 ± 100 ppm/˚C (max) 1.225 Tolerance (Note 6) IRMIN LM4041AIM3 LM4041AIZ Limits (Note 5) Minimum Operating Current V 45 Average Reverse Breakdown Voltage Temperature Coefficient (Note 6) IR= 10 mA IR = 100 µA ± 20 ± 15 ± 15 Reverse Breakdown Voltage Change with Operating Current Change IRMIN ≤ IR ≤ 1 mA 0.7 IR = 1 mA 1 mA ≤ IR ≤ 12 mA µA ppm/˚C ppm/˚C mV 1.5 1.5 mV (max) 2.0 2.0 mV (max) 6.0 6.0 mV (max) 8.0 8.0 mV (max) 4.0 ZR Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz, eN Wideband Noise IR = 100 µA mV Ω 0.5 IAC= 0.1 IR 1.5 1.5 Ω (max) 20 µVrms 120 ppm 10 Hz ≤ f ≤ 10 kHz ∆VR Reverse Breakdown Voltage Long Term Stability t = 1000 hrs T = 25˚C ± 0.1˚C IR = 100 µA 3 www.national.com LM4041 Absolute Maximum Ratings (Note 1) LM4041 LM4041-1.2 Electrical Characteristics (Industrial Temperature Range) Boldface limits apply for TA = TJ = TMINto TMAX; all other limits TA = TJ = 25˚C. The grades C, D and E designate initial Reverse Breakdown Voltage tolerances of ± 0.5%, ± 1.0% and ± 2.0%, respectively. Symbol VR Parameter Conditions Reverse Breakdown Voltage IR = 100 µA Reverse Breakdown Voltage IR = 100 µA Typical LM4041CIM3 LM4041DIM3 LM4041EIM3 (Note 4) LM4041CIZ LM4041DIZ LM4041EIZ LM4041CIM7 LM4041DIM7 LM4041EIM7 Limits Limits(Note Limits (Note 5) 5) (Note 5) 1.225 Tolerance (Note 6) IRMIN ∆VR/∆T ∆VR/∆IR Minimum Operating Current IR = 10 mA IR= 100 µA ± 20 ± 15 ± 15 Reverse Breakdown Voltage Change with Operating Current Change IRMIN ≤ IR ≤ 1 mA 0.7 IR = 1 mA 1 mA ≤ IR ≤ 12 mA ZR ±6 ± 12 ± 25 mV (max) ± 14 ± 24 ± 36 mV (max) Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz Wideband Noise IR = 100 µA µA 60 65 65 µA (max) 65 70 70 µA (max) ± 100 ± 150 ± 150 ppm/˚C (max) ppm/˚C ppm/˚C mV 1.5 2.0 2.0 mV (max) 2.0 2.5 2.5 mV (max) 6.0 8.0 8.0 mV (max) 8.0 10.0 10.0 mV (max) 2.5 mV Ω 0.5 IAC = 0.1 IR eN V 45 VR Temperature Coefficient (Note 6) Units (Limit) 1.5 2.0 2.0 Ω(max) 20 µVrms 120 ppm 10 Hz ≤ f ≤ 10 kHz ∆VR Reverse Breakdown Voltage Long Term Stability www.national.com t = 1000 hrs T = 25˚C ± 0.1˚C IR = 100 µA 4 LM4041 LM4041-1.2 Electrical Characteristics (Extended Temperature Range) Boldface limits apply for TA = TJ = TMINto TMAX; all other limits TA = TJ = 25˚C. The grades C, D and E designate initial Reverse Breakdown Voltage tolerance of ± 0.5%, ± 1.0% and ± 2.0% respectively. Symbol VR Parameter Conditions Reverse Breakdown Voltage IR = 100 µA Reverse Breakdown Voltage Error IR = 100 µA Typical LM4041CEM3 LM4041DEM3 LM4041EEM3 (Note 4) Limits Limits Limits (Note 5) (Note 5) (Note 5) 1.225 (Note 6) IRMIN ∆VR/∆T ∆VR/∆IR Minimum Operating Current V ±6 ± 12 ± 25 mV (max) ± 18.4 ± 31 ± 43 mV (max) 45 IR = 1 mA ± 20 ± 15 IR = 100 µA ± 15 IRMIN ≤ IR ≤ 1.0 mA 0.7 VR Temperature Coefficient(Note 6) IR= 10 mA Reverse Breakdown Change with Current 1 mA ≤ IR ≤ 12 mA ZR Reverse Dynamic Impedance IR = 1 mA, f = 120 Hz, eN Noise Voltage IR = 100 µA µA 60 65 65 µA (max) 68 73 73 µA (max) ppm/˚C ± 100 ± 150 ± 150 ppm/˚C (max) ppm/˚C mV 1.5 2.0 2.0 mV (max) 2.0 2.5 2.5 mV (max) 6.0 8.0 8.0 mV (max) 8.0 10.0 10.0 mV (max) 2.5 mV Ω 0.5 IAC= 0.1 IR Units (Limit) 1.5 2.0 2.0 Ω (max) 20 µVrms 120 ppm 10 Hz ≤ f ≤ 10 kHz ∆VR Long Term Stability (Non-Cumulative) t = 1000 hrs T = 25˚C ± 0.1˚C IR = 100 µA 5 www.national.com LM4041 LM4041-ADJ (Adjustable) Electrical Characteristics (Industrial Temperature Range) Boldface limits apply for TA = TJ = TMINto TMAX; all other limits TJ = 25˚C unless otherwise specified (SOT-23, see (Note 7)), IRMIN ≤ IR ≤ 12 mA, VREF ≤ VOUT ≤ 10V. The grades C and D designate initial Reference Voltage Tolerances of ± 0.5% and ± 1%, respectively for VOUT = 5V. Symbol VREF Parameter Conditions Typical (Note 4) Reference Voltage IR = 100 µA, VOUT = 5V Reference Voltage IR = 100 µA, VOUT = 5V ∆VREF/∆IR Minimum Operating Current Reference Voltage Change with Operating Current Change IRMIN ≤ IR ≤ 1 mA ∆VREF/∆T ZOUT eN ± 12 ± 24 mV (max) 60 65 µA (max) 65 70 µA (max) V mV (max) µA mV SOT-23: VOUT ≥ 1.6V 1.5 2.0 mV (max) (Note 7) 2.0 2.5 mV (max) 2 IR = 1 mA mV 4 6 mV (max) 6 8 mV (max) −1.55 Feedback Current mV/V −2.0 −2.5 mV/V (max) −2.5 −3.0 mV/V (max) 100 150 nA (max) 120 200 nA (max) 60 Average Reference Voltage Temperature Coefficient (Note 8) VOUT = 5V, Dynamic Output Impedance IR = 1 mA, f = 120 Hz, Wideband Noise ± 6.2 ± 14 0.7 SOT-23: VOUT ≥ 1.6V (Note 7) IFB Units (Limit) 45 1 mA ≤ IR ≤ 12 mA ∆VREF/∆VO Reference Voltage Change with Output Voltage Change LM4041DIM3 LM4041DIZ LM4041DIM7 (Note 5) 1.233 Tolerance (Note 8) IRMIN LM4041CIM3 LM4041CIZ LM4041CIM7 (Note 5) IR = 10 mA IR = nA 20 1 mA 15 IR = 100 µA 15 ppm/˚C ± 100 ± 150 ppm/˚C (max) ppm/˚C IAC = 0.1 IR IR = 100 µA VOUT = VREF 0.3 Ω VOUT = 10V 2 Ω VOUT = VREF 20 µVrms 120 ppm 10 Hz ≤ f ≤ 10 kHz ∆VREF Reference Voltage Long t = 1000 hrs, Term Stability T = 25˚C ± 0.1˚C www.national.com IR = 100 µA 6 LM4041 LM4041-ADJ (Adjustable) Electrical Characteristics (Extended Temperature Range) Boldface limits apply for TA = TJ = TMINto TMAX; all other limits TJ = 25˚C unless otherwise specified (SOT-23, see (Note 7)), IRMIN ≤ IR ≤ 12 mA, VREF ≤ VOUT ≤ 10V. The grades C and D designate initial Reference Voltage Tolerances of ± 0.5% and ± 1%, respectively for VOUT = 5V. Symbol VREF Parameter Conditions Typical (Note 4) Reference Voltage IR = 100 µA, VOUT = 5V Reference Voltage IR = 100 µA, VOUT = 5V 1.233 ∆VREF/∆IR Minimum Operating Current Reference Voltage Change with Operating Current Change ∆VREF/∆T ZOUT mV (max) 60 65 µA (max) 68 73 µA (max) mV SOT-23: VOUT ≥ 1.6V 1.5 2.0 mV (max) (Note 7) 2.0 2.5 mV (max) 8 10 mV (max) 6 8 mV (max) 2 SOT-23: VOUT ≥ 1.6V(Note 7) IFB mV (max) µA 0.7 1 mA ≤ IR ≤ 12 mA ∆VREF/∆VO Reference Voltage Change with Output Voltage Change ± 12 ± 30 45 IRMIN ≤ IR ≤ 1 mA Units (Limit) V ± 6.2 ± 18 Tolerance (Note 8) IRMIN LM4041CEM3 LM4041DEM3 (Note 5) (Note 5) IR = 1 mA mV −1.55 Feedback Current mV/V −2.0 −2.5 mV/V (max) −3.0 −4.0 mV/V (max) 60 Average Reference Voltage Temperature Coefficient (Note 8) VOUT = 5V, IR = 10 mA Dynamic Output Impedance IR = 1 mA, f = 120 Hz, IR = nA 100 150 nA (max) 120 200 nA (max) ± 100 ± 150 20 1 mA 15 IR = 100 µA 15 ppm/˚C ppm/˚C (max) ppm/˚C IAC = 0.1 IR VOUT = VREF 0.3 Ω VOUT = 10V 2 Ω VOUT = VREF 20 µVrms 120 ppm eN Wideband Noise ∆VREF Reference Voltage Long t = 1000 hrs, Term Stability T = 25˚C ± 0.1˚C IR = 100 µA 10 Hz ≤ f ≤ 10 kHz IR = 100 µA 7 www.national.com LM4041 Electrical Characteristics (continued) Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. Note 2: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax (maximum junction temperature), θJA (junction to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PDmax = (TJmax − TA)/θJA or the number given in the Absolute Maximum Ratings, whichever is lower. For the LM4041, TJmax = 125˚C, and the typical thermal resistance (θJA), when board mounted, is 326˚C/W for the SOT-23 package, 415˚C/W for the SC70 package and 180˚C/W with 0.4" lead length and 170˚C/W with 0.125" lead length for the TO-92 package. Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The machine model is a 200 pF capacitor discharged directly into each pin. All pins are rated at 2kV for Human Body Model, but the feedback pin which is rated at 1kV. Note 4: Typicals are at TJ = 25˚C and represent most likely parametric norm. Note 5: Limits are 100% production tested at 25˚C. Limits over temperature are guaranteed through correlation using Statistical Quality Control (SQC) methods. The limits are used to calculate National’s AOQL. Note 6: The boldface (over-temperature) limit for Reverse Breakdown Voltage Tolerance is defined as the room temperature Reverse Breakdown Voltage Tolerance ± [(∆VRv∆T)(max ∆T)(VR)]. Where, ∆VR/∆T is the VR temperature coefficient, max∆T is the maximum difference in temperature from the reference point of 25 ˚C to T MAX or TMIN, and VR is the reverse breakdown voltage. The total over-temperature tolerance for the different grades in the industrial temperature range where max∆T=65˚C is shown below: A-grade: B-grade: C-grade: D-grade: E-grade: ± 0.75% = ± 0.85% = ± 1.15% = ± 1.98% = ± 2.98% = ± 0.1% ± 0.2% ± 0.5% ± 1.0% ± 2.0% ± 100 ppm/˚C x 65˚C ± 100 ppm/˚C x 65˚C ± 100 ppm/˚C x 65˚C ± 150 ppm/˚C x 65˚C ± 150 ppm/˚C x 65˚C The total over-temperature tolerance for the different grades in the extended temperature range where max ∆T = 100 ˚C is shown below: B-grade: C-grade: D-grade: E-grade: ± 1.2% = ± 1.5% = ± 2.5% = ± 4.5% = ± 0.2% ± 0.5% ± 1.0% ± 2.0% ± 100 ppm/˚C x 100˚C ± 100 ppm/˚C x 100˚C ± 150 ppm/˚C x 100˚C ± 150 ppm/˚C x 100˚C Therefore, as an example, the A-grade LM4041-1.2 has an over-temperature Reverse Breakdown Voltage tolerance of ± 1.2V x 0.75% = ± 9.2 mV. Note 7: When VOUT ≤ 1.6V, the LM4041-ADJ in the SOT-23 package must operate at reduced IR. This is caused by the series resistance of the die attach between the die (-) output and the package (-) output pin. See the Output Saturation (SOT-23 only) curve in the Typical Performance Characteristics section. Note 8: Reference voltage and temperature coefficient will change with output voltage. See Typical Performance Characteristics curves. Typical Performance Characteristics Temperature Drift for Different Average Temperature Coefficient Output Impedance vs Frequency DS011392-19 DS011392-4 www.national.com 8 (Continued) Noise Voltage Reverse Characteristics and Minimum Operating Current DS011392-5 LM4041 Typical Performance Characteristics DS011392-9 Start-Up Characteristics DS011392-8 DS011392-7 Reference Voltage vs Output Voltage and Temperature Reference Voltage vs Temperature and Output Voltage DS011392-11 DS011392-10 9 www.national.com LM4041 Typical Performance Characteristics (Continued) Feedback Current vs Output Voltage and Temperature Output Saturation (SOT-23 Only) DS011392-33 DS011392-12 Output Impedance vs Frequency Output Impedance vs Frequency DS011392-13 DS011392-14 Reverse Characteristics DS011392-16 DS011392-15 www.national.com 10 LM4041 Typical Performance Characteristics (Continued) Large Signal Response DS011392-18 DS011392-17 Functional Block Diagram DS011392-21 *LM4041-ADJ only **LM4041-1.2 only 11 www.national.com LM4041 Applications Information The LM4041 is a precision micro-power curvature-corrected bandgap shunt voltage reference. For space critical applications, the LM4041 is available in the sub-miniature SOT-23 and SC70 surface-mount package. The LM4041 has been designed for stable operation without the need of an external capacitor connected between the “+” pin and the “−” pin. If, however, a bypass capacitor is used, the LM4041 remains stable. Design effort is further reduced with the choice of either a fixed 1.2V or an adjustable reverse breakdown voltage. The minimum operating current is 60 µA for the LM4041-1.2 and the LM4041-ADJ. Both versions have a maximum operating current of 12 mA. LM4041s using the SOT-23 package have pin 3 connected as the (-) output through the package’s die attach interface. Therefore, the LM4041-1.2’s pin 3 must be left floating or connected to pin 2 and the LM4041-ADJ’s pin 3 is the (-) output. LM4041s using the SC70 package have pin 2 connected as the (−) output through the packages’ die attach interface. Therefore, the LM4041-1.2’s pin 2 must be left floating or connected to pin 1, and the LM4041-ADJ’s pin 2 is the (−) output. In a conventional shunt regulator application (Figure 1), an external series resistor (RS) is connected between the supply voltage and the LM4041. RS determines the current that flows through the load (IL) and the LM4041 (IQ). Since load current and supply voltage may vary, RS should be small enough to supply at least the minimum acceptable IQ to the LM4041 even when the supply voltage is at its minimum and the load current is at its maximum value. When the supply voltage is at its maximum and IL is at its minimum, RS should be large enough so that the current flowing through the LM4041 is less than 12 mA. RS should be selected based on the supply voltage, (VS), the desired load and operating current, (IL and IQ), and the LM4041’s reverse breakdown voltage, VR. where VO is the output voltage. The actual value of the internal VREF is a function of VO. The “corrected” VREF is determined by VREF = ∆VO (∆VREF/∆VO) + VY where VY = 1.240 V and ∆VO = (VO − VY) ∆VREF/∆VO is found in the Electrical Characteristics and is typically −1.55 mV/V. You can get a more accurate indication of the output voltage by replacing the value of VREF in equation (1) with the value found using equation (2). Note that the actual output voltage can deviate from that predicted using the typical value of ∆VREF/∆VO in equation (2): for C-grade parts, the worst-case ∆VREF/∆VO is −2.5 mV/V. For D-grade parts, the worst-case ∆VREF/∆VO is −3.0 mV/V. Typical Applications DS011392-22 FIGURE 1. Shunt Regulator The LM4041-ADJ’s output voltage can be adjusted to any value in the range of 1.24V through 10V. It is a function of the internal reference voltage (VREF) and the ratio of the external feedback resistors as shown in Figure 2 . The output voltage is found using the equation VO = VREF[(R2/R1) + 1] (1) DS011392-34 VO = VREF[(R2/R1) + 1] FIGURE 2. Adjustable Shunt Regulator www.national.com (2) 12 LM4041 Typical Applications (Continued) DS011392-24 FIGURE 3. Bounded amplifier reduces saturation-induced delays and can prevent succeeding stage damage. Nominal clamping voltage is ± VO (LM4041’s reverse breakdown voltage) +2 diode VF. DS011392-23 DS011392-20 FIGURE 5. Voltage Level Detector FIGURE 4. Voltage Level Detector 13 www.national.com LM4041 Typical Applications (Continued) DS011392-35 FIGURE 8. Bidirectional Adjustable Clamp ± 18V to ± 2.4V DS011392-25 FIGURE 6. Fast Positive Clamp 2.4V + VD1 DS011392-26 FIGURE 7. Bidirectional Clamp ± 2.4V DS011392-36 FIGURE 9. Bidirectional Adjustable Clamp ± 2.4V to ± 6V DS011392-37 FIGURE 10. Simple Floating Current Detector www.national.com 14 LM4041 Typical Applications (Continued) DS011392-38 FIGURE 11. Current Source Note 9: *D1 can be any LED, VF = 1.5V to 2.2V at 3 mA. D1 may act as an indicator. D1 will be on if ITHRESHOLDfalls below the threshold current, except with I = 0. DS011392-39 FIGURE 12. Precision Floating Current Detector 15 www.national.com LM4041 Typical Applications (Continued) DS011392-28 DS011392-29 FIGURE 13. Precision 1 µA to 1 mA Current Sources www.national.com 16 LM4041 Physical Dimensions inches (millimeters) unless otherwise noted Plastic Surface Mount Package (M3) NS Package Number MF03A (JEDEC Registration TO-236AB) 17 www.national.com LM4041 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Molded Package (SC70) NS Package Number MAA05A www.national.com 18 LM4041 Precision Micropower Shunt Voltage Reference Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Plastic Package (Z) NS Package Number Z03A 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. National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: [email protected] www.national.com National Semiconductor Europe Fax: +49 (0) 180-530 85 86 Email: [email protected] Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +44 (0) 870 24 0 2171 Français Tel: +33 (0) 1 41 91 8790 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 Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: [email protected] National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 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.