MICHEL LM4040/4041 Precision Micropower Shunt Voltage Reference Preliminary Information General Description Ideal for space critical applications, the LM4040 and LM4041 precision voltage references are available in the sub-minia- ture (3mm x 1.3mm) SOT-23 surface-mount package, the SO-8 surface-mount package, or the TO-92 package. The LM4040 is the available in several fixed reverse break- down voltages: 2.500V, 4.096V, 5.000V, and 10.000V. The LM4041 is available with a fixed 1.225V or an adjustabie reverse breakdown voltage. The LM4040 and LM4041's advanced design eliminates the need for an external stabilizing capacitor while ensuring stability with any capacitive load, making them easy to use. The minimum operating current increases from 60uA for the LM4041-1.2 to 100A for the LM4040-10.0. LM4040 ver- sions have a maximum operating current of 15mA. LM4041 versions have a maximum operating current of 12mA. The LM4040 and LM4041 utilizes zener-zap reverse break- down voltage trim during wafer sort fo ensure that the prime parts have an accuracy of better than +0.5% (C grade) at 25C. Bandgap reference temperature drift curvature correc- tion and low dynamic impedance ensure stable reverse breakdown voltage accuracy over a wide range of operating temperatures and currents. Features + Small Package: SOT-23, TO-92, and SO-8 + No output capacitor required + Tolerates capacitive loads + Fixed reverse breakdown voltages of 1.225, 2.500V, 4.096V, 5.000V, and 10.000V + Adjustable reverse breakdown version * Contact Micrel for parts with extended temperature range. Key Specifications + Output voltage tolerance (C grade, 25C) .. +0.5% (max) + Low output noise (10Hz to 100Hz) LM4040 oo eee een ntiternees 35uVans (typ) LM4041 occ eeeeeceeenetaeereenenaeees 20uVams (typ) + Wide operating current range LM4040 ooo eer eeeecteraeeee 60pA to 15mA LM4041 ... BOPA to 12MA * Industrial temperature range ...........0.0. 40C to +85C + Low temperature coefficient .......0.0... 100ppm/C (max) Applications Battery-Powered Equipment Data Acquisition Systems * Instrumentation * Process Control * Energy Management * Product Testing Automotive Electronics * Precision Audio Components Typical Applications Vs Rs tlo# Vp bo Vo LM4040 LM4041 4 lo Figure 1. LM4040, LM4041 Fixed Shunt Regulator Application Vs Rs Va Vo 3 R, LM4041 Vo5=1.233(R +1) Adjustable <A a gle it Figure 2. LM4041 Adjustable Shunt Regulator Application 10-16 1997LM4040/4041 Pin Configuration Micrel 2 NC + = +O 3 2 1 LK bt ~ch 3 Pin 1 must float or be connected to pin 3. Fixed Version Fixed Version Fixed Version SOT-23 (M3) Package SO-8 (M) Package TO-92 (Z) Package Top View Top View Bottom View 2 FB + - FBC 3 2 1 es 1- + 3 Adjustable Version Adjustable Version Adjustable Version SOT-23 (M3) Package $O-8 (M) Package TO-92 (Z) Package Top View Top View Bottom View Ordering Information Part Number Voltage Accuracy, Part Number Voltage Accuracy, Temp. Coefficient Temp. Coefficient LM4040CIM3-2.5 2.500V +0.5%, 100ppm/C LM4040CIM3-10.0 10.00V +0.5%, 100ppm/C LM4040DIM-2.5 2.500V +1.0%, 150ppm/C LM4040DIM-10.0 10.00V +1.0%, 150ppm/C LM4040DIM3-2.5 2.500V +1.0%, 150ppm/C LM4040DIM3-10.0 10.00V +1.0%, 150ppm/C LM4040DIZ-2.5 2.500V +1.0%, 150ppm/C LM4040DI1Z-10.0 10.00V +1.0%, 150ppm/C LM4040EIM3-2.5 2.500V +2.0%, 150ppm/C LM4041CIM3-1.2 1,225V +0.5%, 100ppm/C LM4040CIM3-4.1 4.096V +0.5%, 100ppm/C LM4041DIM-1.2 1.225V +1.0%, 150ppm/C LM4040DIM-4.1 4.096V +1.0%, 150ppm/C LM4041DIM3-1.2 1,225V 1.0%, 150ppm/C LM4040DIM3-4.1 4.096V +1.0%, 150ppm/C LM4041DIZ-1.2 1.225V 1.0%, 150ppm/C LM4040DI1Z-4.1 4.096V +1.0%, 150ppm/C LM4041EIM3-1.2 1.225V +2.0%, 150ppm/C LM4040CIM3-5.0 5.000V +0.5%, 100ppm/C LM4041CIM3-ADJ 1.24V to 10V +0.5%, 100ppm/C LM4040DiM-5.0 5.000V 1.0%, 150ppm/C LM4041DIM-ADJ 1.24V to 10V 1.0%, 150ppm/C LM4040DIM3-5.0 5.000V +1.0%, 150ppm/*C LM4041 DIM3-ADJ 1.24V to 10V +1.0%, 150ppm/C LM4040DIZ-5.0 5.000V +1.0%, 150ppm/C LM4041DIZ-ADJ 1.24V to 10V +1.0%, 150pprn/C Contact factory for availability of 0.1% and 0.2% devices. SOT-23 Package Markings Example Field Code Example Field Code Example Field Code R__ 1st Character FR = Reference _4_ 2nd Character 1 = 1.225V _A 3rd Character C = +0.5% 2 = 2.500V D=+1.0% Example: R4C represents Reference, 4.096V, 4 = 4,096V E =+2.0% +0,5% (LM4040CIM3-4.1) 5 = 5.000V 10 = 10.00V Note: if Grd character is omitted, container will A = Adjustable indicate tolerance. 1997 10-17LM4040/4041 Micrel Functional Diagram Functional Diagram LM4040, LM4041 Fixed LM4041 Adjustable + Ps @O + + s P , : $ Vrer + ; 3 + ? FB Absolute Maximum Ratings Operating Ratings (Notes 1 & 2) Reverse Current Temperature Range Forward Current (Tran S Ta S Tay) cecccesceeeeseteeeeeees -40C < T, < +85C Maximum Output Voltage Reverse Current LM4041-Adjustable ......0.0cccccccscsceceessesneeteesteneeen 15V LM4040-2.5 oo rete cence ceeeeeitens GOLA to 15mA Power Dissipation (T, = 25C) (Note 2) LM4040-4.1 ---- BBYA to 15mA LR 2d (6). : (c |- LM4040-5.0 v TARA to 15MA M3 Package .. LM4040-10.0 o...ccsccccscecesttesssecsssseeeen 100pA to 15mA Z PaCkAGG .o.ccecccseccecsessccsesteseeseseseaveacatsseeeeetanesees Seesaw steeeneaeeneeeesneentnenicesteeantnttaes 6OpA to 12mA Storage Temperature ........cccseeeeseeeee -65C to +150C Out vole a EE GOLA to 12mA utpu ge ge Lead Temperature LM4041-AD oonseccscrsseccseesteessnsseesense 1.24V to 10V M and M3 Packages Vapor phase (60 seconds) 0.0... ccs +215C Infrared (15 seCONdS) oe eee tneeens +220C Z Package Soldering (10 seconds) 0.00... cece cee +260C ESD Susceptibility Human Body Model (Note 3) Machine Model (Note 3)... cee eee LM4040 and LM4041 Applications Information The LM4040 and LM4041 have been designed for stable operation without the need of an external capacitor con- nected between the (+) and (-) pins. If a bypass capacitor is used, the references remain stable. SOT-23 Versions LM4040-x.x and LM4041-1.2s in the SOT-23 packages have a parasitic Schottky diode between pin 3 () and pin 1 (die attach interface connect). Pin 1 of the SOT-23 package must float or be connected to pin 3. LM4041-ADJs use pin 1 as the (-) output. Conventional Shunt Regulator In a conventional shunt regulator application (see Figure 1), an external series resistor (Rg) is connected between the supply voltage and the LM4040-x.x or LM4041-1.2 reference. Rg determines the current that flows through the load (I, ) and the reference (Iq). Since load current and supply voltage may vary, Rg should be small enough to supply at least the minimum acceptable |, to the reference even when the supply voltage is at its minimum and the load current is at its (continued following LM4041 typical characteristics) 10-18 1997LM4040/4041 Micrel LM4040-2.5 Electrical Characteristics LM4040DIM LM4040CIM3 | LM4040DIM3 | LM4040EIM3 Symbol | Parameter Conditions Typical LM4040DIZ Units (Note 4) Limits Limits Limits (Limit) (Note 5) (Note 5) (Note 5) Va Reverse Breakdown Voitage Ip = 100A 2.500 Vv Reverse Breakdown Voltage Ip = 100RA +12 +25 +50 mV (max} Tolerance +29 +49 74 mV (max) lamin Minimum Operating Current 45 LA 60 65 65 pA (max) 65 70 70 HA (max) AVp/AT | Average Reverse Breakdown ly = 10mA 20 popm/C Voltage Temperature Ip = 1mMA 15 100 150 160 ppm/C (max) Coefticient Ih = 100pA 15 ppm/C (max) AVp/Alp | Reverse Breakdown Voltage lamin S ly tmA 03 mv Change with Operating 0.8 1.0 1.0 mV (max) Current Change 1.0 1.2 1.2 mV (max) ImA < I,_ 15mA 2.5 mV 6.0 8.0 8.0 mV (max) 8.0 10.0 10.0 mV (max) Zp Reverse Dynamic Impedance Ip = mA, f = 120Hz 0.3 Q Ing = 0.1 Ip 0.9 1 14 Q (max) ey Wideband Noise Ip = 100pA 10Hz < f < 10kHz 35 UVaMs AVR Reverse Breakdown Voltage { = 1000hrs Long Term Stability T = 25C +0.1C 120 ppm lg = 100A LM4040-4.1 Electrical Characteristics LM4040DIM LM4040CIM3 LM4040DIM3 Symbol | Parameter Conditions Typical LM4040DIZ Units (Note 4) Limits Limits (Limits) (Note 5) (Note 5) Vr Reverse Breakdown Voltage Iq = 100pA 4.096 Vv Reverse Breakdown Voltage Iq = 100HA +20 +44 mV (max) Tolerance +a7 +61 mV (max) lamin Minimum Operating Current 50 HA 68 73 uA (max) 73 78 HA (max) AV,/AT | Average Reverse Breakdown Ig = 10mMA 30 ppm/?C Voltage Temperature Ip=tmA 20 100 150 ppm/C (max) | ) Coefficient Ip = 100A 20 ppm/c (max) AVp/Al_ | Reverse Breakdown Voltage lamin Sig 1mA 0.8 mV Change with Operating 0.9 1.2 mV (max) Current Change 1.2 1.5 mV (max) 1mA < Ip 15mA 3.0 mV 7.0 9.0 mV (max) 10.0 13.0 mV (max) ZR Reverse Dynamic Impedance Ip = 1mA, f = 120Hz 0.5 Q lag = 0.1 ly 1.0 1.3 Q (max} en Wideband Noise Ip = 100A 10Hz sf < 10kHz 80 wVaus AV_ Reverse Breakdown Voltage t= 1000hrs Long Term Stabitity T = 25C 0.1C 120 ppm Ip = 100nA Boldface limits apply for T, = Ty = Tyin tO Tyax: all other limits T, = T, = 25C. The grades C, D, and E designate initial Reverse Breakdown Voltage tolerance of +0.5%, +1.0%, and +2.0 respectively. 1997 10-19LM4040/4041 Micrel LM4040-5.0 Electrical Characteristics LM4040DIM LM4040CIM3 LM40400IM3 Symbol | Parameter Conditions Typical LM4040DIZ Units (Note 4) Limits Limits (Limits) (Note 5) (Note 5) Ve Reverse Breakdown Voltage Ip = 100pA 5.000 v Reverse Breakclown Voltage Iq = 100pA +25 +50 mV (max) Tolerance +58 +99 mV (max) lan Minimum Operating Current 54 pA 74 79 HA (max) 80 85 HA (max) AVp/AT | Average Reverse Breakdown Ip = 10mMA 30 ppmec Voltage Temperature I_ = 1mA 20 100 150 ppm/C (max) Coefficient Ip = 100nA 20 ppm/C (max) AVp/Al_ | Reverse Breakdown Voltage lamin <a IMA 0.5 mV Change with Operating 1.0 1.3 mv (max) Current Change 13 1.8 mV (max) imA < lI, 15mA 3.5 mV 8.0 10.0 mV (max) 12.0 15.0 mv (max) 2p Reverse Dynamic impedance I, = 1mA, f = 120Hz 0.5 Q lac = O.1Sq V4 4.5 Q (max) ey Wideband Noise Ip = 100HA 10Hz < f < 10kHz 80 uVeus AVe Reverse Breakdown Voltage t= 1000hrs Long Term Stability T= 25C 0.1C 120 ppm Iq = 100pA LM4040-10.0 Electrical Characteristics LM4040DIM LM4040CIM3 LM4040DIM3 Symbo! | Parameter Conditions Typical LM4040DIZ Units (Note 4) Limits Limits (Limits) (Note 5) (Note 5) Va Reverse Breakdown Voltage ip = 150pA 10.00 v Reverse Breakdown Voltage Ip = 150pA +50 100 mV (max) Tolerance +115 +198 mv (max) lamin Minimum Operating Current 75 pA 100 110 pA (max) 103 113 A (max) AVp/AT | Average Reverse Breakdown Iq = 10mA 40 pomec Voltage Temperature le = 1mA 20 100 150 ppm/C (max) Coefficient Ip = 150pA 20 ppm/C (max) AVp/Al_ | Reverse Breakdown Voltage lamin < la ImA 0.8 mV Change with Coerating 1.5 2.0 mV (max) Current Change 3.5 4.0 mV (max) 1mA < Ip 15mA 8.0 mV 12.0 48.0 mV (max) 23.0 29.0 mV (max) Zp Reverse Dynamic Impedance Iq = IMA, f = 120HZ 0.7 Q Ing = 0.1 Ip 17 2.3 Q (max) ey Wideband Noise ty = 150pA 10Hz $f < 10kHz 180 BVams AVR Reverse Breakdown Voltage t= 1000hrs Long Term Stability T= 26C 40.1C 120 ppm Iq = 150A Boldface limits apply for T, = Ty = Tyyny tO Tyax: all other limits T, = T, = 25C. The grades C and D designate initial Reverse Breakdown Voitage tolerance of +0.5% and + 1.0% respectively. 10-20 1997LM4040/4041 LM4040 Typical Characteristics Temperature Drift for Different Average Temperature Coefficient +0.5 +0.4 +4.3 40.2 cy 0.4 0 @ -01 0.2 -0.3 -0.4 -0.5 -40 Se E HAN Vin (VY) Vp (V) oOo Nn pp Ip = 150pA -22ppmC 20 0 20 40 60 BO 100 TEMPERATURE (C) 120 100 80 60 2 40 iu 20 LM4040-2.5 A, = 30k 20 RESPONSE TIME (ys) 40 60 IMPEDANCE (Q:) o 0.1 Output Impedance vs. Frequency | 7 A = lamin + 100 HA J = 25C, Alp 20.1 C, = 1pF Ne SN oh tk 10k 100k FREQUENCY (Hz) 100 1M Reverse Characteristics and Minimum Operating Current 80 6 REVERSE VOLTAGE (V} Vv we) LM4040 > So iz) Noise (yV/ 8 10 4 Rg Va 1Hz rate Vin (WY) Va) onNM D Test Circuit LM4040-5.0 Rg = 30k 100 200 Wo 400 RESPONSE TIME (us) 10 Output Impedance vs. Frequency 1k T= mA ST 2 25C, Aly =| od ear @ 100 w 9 2 10 | _V, = 10V a vt) a = 4 04 100 1k 10k = 100K 1M FREQUENCY (Hz) Noise Voltage vs. Frequency = 200uA Ty = 25C V, = 10V 5V 100 1k 10k 100k FREQUENCY (Hz) LM4040-10.0 Ag = 30k Vin (V) Va () 0 100 200 RESPONSE TIME (ys) 300 400 Micrel 1997 10-211M4040/4041 Micrel LM4041-1.2 Electrical Characteristics LM4041CIM3 Symbol | Parameter Conditions Typical Units (Note 4) Limits (Limit) (Note 5) Ve Reverse Breakdown Voltage I_ = 100pA 1.225 v Reverse Breakdown Voltage Ip = 100pA +6 mV (max} Tolerance 414 mv (max) lamin Minimum Operating Current 45 pA 60 HA (max) 65 BA (max) AV_/AT | Average Reverse Breakdown I_ = 10mA 20 pom/?C Voltage Temperature Iq = 1mA 16 +100 pem/C (max) Coefficient Ip = 100pA 15 ppm/C (max) AV,/Al_ | Reverse Breakdown Voltage layin Sl IMA 0.7 mV Change with Operating 1.5 mV (max) Current Change 2.0 mV (max) 1mA < I, 12mA 4.0 mV 6.0 mv (max) 8.0 maV (max) 2p Reverse Dynamic impedance In = 1mA, f = 120Hz 0.5 Q lag = 0.1 I5 1.5 Q (max) en Wideband Noise Ip = 100pA 10Hz < f < 10kHz 20 uVaMs AVA Reverse Breakdown Voltage t = 1000hrs Long Term Stability T = 26C +0.1C 120 ppm Iq = 100A LM4041DIM LM4041DIM3 LM4041EIM3 Symbol | Parameter Conditions Typical LM4041DIZ Units (Note 4) Limits Limits (Limit) (Note 5) {Note 5) VR Reverse Breakdown Voltage Ip = 100pA 1.225 Vv Reverse Breakdown Voltage \q = 100pA +12 +25 mV (max) Tolerance 424 +36 mV (max) lamin Minimum Operating Current 45 pA 65 65 pA (max) 70 70 pA (max) AVp/AT | Average Reverse Breakdown Ip = 10mMA 20 ppm? Voltage Temperature fa =1mA 15 150 +150 pprm/C (max) Coefficient 1g = 100pA 15 ppm/C (max) AVp/Al_ | Reverse Breakdown Voltage lamin ba IMA 0.3 mV Change with Operating 2.0 2.0 mvV (max) Current Change 2.5 2.5 mV (max) 1mA < Ip 15mA 2.5 mV 8.0 8.0 mV (max) 10.0 10.0 mV (max) Ze Reverse Dynamic Impedance | I, = 1mA, f = 120Hz 0.3 2 lag = 0.14 In 2.0 2.0 Q (max) ey Wideband Noise Ip = 100pA 1OHz sf < 10kHz 35 BVams AVR Reverse Breakdown Voltage t = 1000hrs Long Term Stability T = 25C +0.1C 120 ppm ly = 10024 Boldface limits apply for T, = Ty = Ty tO Tyay: all other limits T, = T, = 25C. The grades C, D, and E designate initial Reverse Breakdown Voltage tolerance of +0.5%, + 1.0%, and +2.0 respectively. 10-22 1997LM4040/4041 Micrel LM4041-Adjustable Electrical Characteristics LM4041DIM LM4041CIM3 LM40410IM3 Symbol | Parameter Conditions Typical LM4041DIZ Units (Note 4) Limits Limits (Limit) (Note 5) (Note 5) Veer Reference Breakdown Voltage | |p, = 100uA 1.233 v Vout = 5V Reference Breakdown Voltage | Ip = 100A +6.2 +12 mV (max) Tolerance (Note 8) +14 +24 mV (max) lamin Minimum Operating Current 45 LA 60 65 pA (max) 65 70 HA (max) AVeer Reference Voltage lamin S!_ 1mA 0.7 mV Alp Change with Operating SOT-23: 15 2.0 mV (max) Current Change Vour 2 1.6V 2.0 2.5 mV (max) (Note 7) ImA <I, 12mA 2 mV SOT-23: 4 6 mV (max) Vout 2 1.6V 6 8 mV (max) (Note 7) AWree Reference Voltage Change Ig = 1mA ~1.3 mviV IV with Output Voltage Change -2.0 -2.5 mV/V (max) ~2.5 3.0 mV/V (max) leg Feedback Current 60 nA 100 150 nA (max) 120 200 nA (max) AVacr Average Reference Vour = 5V IAT Voltage Temperature In = 10mA 20 ppm/C Coefficient In = 1mA 15 +100 +150 pom/C (max} (Note 8) Ip = 100A 15 ppm/Cc (max) Zout Dynamic Output Impedance lp = 1mA, f= 120Hz lag = 0.1 Ip Vout = Vaer 0.3 a Vout = 10V 2 Q (max) en Wideband Noise Ig = 100pA 10Hz <f < 10kHz 20 UVaMs AVrer Reference Voltage t= 1000hrs Long Term Stability T = 25C 0.1C 120 ppm tq = 100pA Boldface limits apply for T, = Ty = Tyjy to Tq; all other limits T, = 25C unless otherwise specified (SOT-23, see Note 7), lamin S In < 12MA, Veer S Voy 10V. The grades C and D designate initial Reverse Breakdown Voltage tolerance of 0.5% and +1%, respectively for Voyz = 5V. 1997 10-23LM4040/4041 Micrel LM4040 and LM4041 Electrical Characteristic Notes 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 specitic performance limits. For guaranteed specification 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 T jy,y (maximum junction temperature), 0), (junction to ambient thermal resistance), and T, (ambient temperature). The maximum allowable power dissipation at any temperature is PDyax = (Tyygax > Ta)/8y, OF the number given in the Absalute Maximum Ratings, whichever is lower. For the [M4040 and LM4041, T yyay = 125C, and the typical thermat resistance (8 ,,), when board mounted, is 185C/W for the M package, 326C/W for the SOT-23 package, and 180C/W with 0.4" lead length and 170C/W with 0.125 lead length for the TO-92 package. Note 3 = The human body model is a 100pF capacitor discharged through a 1.5kQ resistor into each pin. The machine model is a 200pF capacitor discharged directly into each pin. Note4 Typicals are at T, = 25C and represent most likely parametric norm. Note 5 Limits are 100% production tested at 25C. Limits over temperature are guaranteed through correlation using Statistical Quality Control (SQL) methods. Note 6 The boldface (over temperature limit for Reverse Breakdown Voltage Tolerance is defined as the room temperature Reverse Breakdown Voltage Tolerance +{(AVp/AT)(65C)(Vp)). AVp/AT is the Vp temperature coefficient, 65C is the tamperature range from 40C to the reference point of 25C, and Vj is the reverse breakdown voltage. The total over temperature tolerance for the different grades follows: C-grade: +1.15% = +0.5% +100ppm/C x 65C D-grade: +1.98% = +1.0% +150ppm/C x 65C. E-grade: +2.98% = +1.0% t150ppmC x 65C Example: The C-grade LM4040-2.5 has an over temperature Reverse Breakdown Voltage tolerance of 2.5 x 1.15% = +28.75mv. Note 7 = When Voy; < 1.6V, the LM4041-ADJ in the SOT-23 package must operate at reduced {,. 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. LM4041 Typical Characteristics Temperature Drift for Different Average Temperature Coefficient Output impedence vs. Frequency Voltage Impedance +0.5 1k 7-65 1000 n= +0.4 Aly = 0.1, Ty = 25C 3103 = 100 1 _~ 800 LM4041-1.2 240.2 g y TADS: Vout = Vier LFF Ww +01 <x 600 2 g z qo S a B -0.1 i @ 400 x02 = , g 03 200 0.4 i Xe 0.5 0.4 0 40 -20 0 20 40 60 8 100 100 1k 10k 100k 1M 1 10 100 1k 10k 100k TEMPERATURE (C) FREQUENCY (Hz) FREQUENCY (Hz) Reverse Characteristics and Reverse Characteristics and Minimum Operating Current Minimum Operating Current 100 100 <= < R, 30k 2 80 = 80 5 F V uw mT] 1N 60 x 60 (7) 5 5 THz rate ma041-1.2 40 3 2 c . LY 59 SC Yoo apne Test Circuit as J uw J c 1-1 c 1-1 REVERSE VOLTAGE (V) 2 REVERSE VOLTAGE (V) 10-24 1997LM4040/4041 LM4041 Typical Characteristics Reference Voitage vs. Output Voltage and Temperature LM4041-ADJ = {) REFERENCE VOLTAGE 0 2 4 6 8 10 OUTPUT VOLTAGE () Output Saturation (SOT-23 Only) 7 7 = 1.6 [Vaou* Vaee + SEV 8 215 & 1.4 < 13 5 p12 5 au 1 oo 2 46 B10 2 OUTPUT CURRENT (mA) Reverse Characteristics t FB STEPS (V) o 2 4 6 8 100 = = 80 _ z = 60 2 3 w 40 id S zZ 20 + J LM4041-ADJ % 2 4 6 8 10 OUTPUT VOLTAGE (V) Large Signal Response t _ 10 = 5 8 2 6 a o 4 > 2 0 0 10 20 30 40 RESPONSE TIME (ys) Reference Voltage vs. Temperature and Output Voltage 1 I, = mA Vv, out = Veer REFERENCE VOLTAGE (V) -40 -20 0 20 40 60 80 100 TEMPERATURE (C) Output impedence vs. Frequency * 1K LM4041-ADJ T,=25C i i, = 1mA ay 100 a Tz | Noha= Ole 8 IMPEDANCE (82 3 100 1k 10k) 100k) 1M FREQUENCY (Hz) LM4041-ADJ Vout t Reverse Characteristics Test Circuit + 15V + Large Signal Response Test Circuit FEEDBACK (nA) IMPEDANCE (2) Micrel Feedback Current vs. Output Voltage and Temperature 100 7 y44041-ADJ so|J ~ , T, = 85C 40 T, = 28C, 40C TSS 20 | | 0 0 2 4 6 8 10 OUTPUT VOLTAGE [(V} Output impedence vs. Frequency * TMa041-ADJ T, = 25C 0 \ 100 tk 10k 100k 1M FREQUENCY (Hz) * Output Impedance vs. Freq. Test Circuit 1997 10-25LM4040/4041 maximum value. When the supply voltage is at its maximum and |, is at its minimum, Rg should be large enough so that the current flowing through the LM4040-x.x is fess than 15mA, and the current flowing through the LM4041-1.2 or LM4041-AD4J is less than 12mA. Rg is determined by the supply voltage (Vg), the load and operating current, (|, and Ig), and the references reverse breakdown voltage (V,). Re = (Vs Va) / (IL + Iq) Adjustable Regulator The LM4041-ADJ's output voltage can be adjusted to any value in the range of 1.24V through 10V. {tis a function of the internal reference voltage (Vpe-) and the ratio of the external feedback resistors as shown in Figure 2. The output is found using the equation (1) Vo = Vagr [(R2/R1) + 1] where V< is the desired output voltage. The actual value of the internal Vaer is a function of Vg. The corrected Vaer is determined by (2) Vage = Vo (AV per /AVg) + Vy Micrel where VQ is the desired output voltage. AVarre / AV, is found inthe Electrical Characteristics andis typically 1.3mV/V and Vy is equal to 1.233V. Replace the value of Vag, in equation (1) with the value found using equation (2). Note that actual output voltage can deviate from that pre- dicted using the typical AVper / AV in equation (2); for C- grade parts, the worst-case AVier / AVo is -2.5mV/V and Vy = 1.248V. The following example shows the difference in output voltage resulting from the typical and worst case values of AVper / AVo: Let V4 =+9V. Using the typical values of AVper /AVg, Vacr is 1.228V. Choosing a value of R1 = 10kQ, R2 = 63.272kQ. Using the worst case AVper / AVo for the C-grade and D- grade parts, the output voltage is actually 8.965V and 8.946V respectively. This results in possible errors as large as 0.39% for the C-grade parts and 0.59% for the D-grade parts. Once again, resistor values found using the typical value of AVrer / AVg will work in most cases, requiring no further adjustment. LM4041-ADJ D1 50pA LM4041-ADJ Figure 5. Fast Positive Clamp 2.4V + AVp, Figure 4. Voltage Level Detector 1N457 LM4041-ADJ LM4041-ADJ Figure 6. Bidirectional Clamp +2.4V 10-26 1997LM4040/4041 Micrel Yn ' | $ Vout 1N457 3 +> LM4041-ADJ - FB LM4041-ADU 4 rr LM4041-ADJ LM4041-ADJ vo 3 1N457 4 Figure 7. Bidirectional Adjustable Clamp Figure 8. Bidirectional Adjustable Clamp +18V to +2.4V 42.4 to +6V 0 to 20mA _- +5V Ris 3900> * 4N4002 | + 2% LM4041-ADJ FB a - R2 D2) ow | 6 470k t N.C + 2 5 CMOS 3 4 N.C.| 4N28 _124V, SpA | Imnesnou= Ay *4Nze GAIN = o2A Figure 9. Floating Current Detector 0 to 20 mA $$ +5V 15V Rie + 33202 + s +H1% Pee LMa041-ADJ D2 x Rs 1N4002 , Fe ik R 22k 1 6 ee fe 4 2 5 | CMOS = <R4 4 2? IPA < Igy = 100mA n.c.-3] gnoe PL 10M 1.24V lour =v IyaREsHOLD = z =3.7MA + 2% r Figure 10. Current Source * D1 can be any LED, V, = 1.5V to 2.2V at mA. D1 may act as an indicator. D1 will be on if IrypesHotp falls below the threshold current, except with | = O. a Figure 11. Precision Floating Current Detector 1997 10-27