lm4041 precision micropower shunt voltage references lm4041 document number: ds32020 rev. 7 - 2 1 of 7 www.diodes.com december 2010 ? diodes incorporated description the lm4041 is a bandgap circuit designed to achieve a precision micro-power volta ge reference of 1.225 v. the device is available in the small outline sot23 and sc70-5 surface mount packages which are ideal for applications where space saving is important. both packages are available to 0.5% c grade and 1% d grade for precision applications. excellent performance is maintained over the 60a to 12ma operating current range with a typical temperature coe fficient of only 20ppm/c. the device has been designed to be highly tolerant of capacitive loads so maintaining excellent stability. this device offers a pin for pin compatible alternative to the lm4041 voltage reference in both adjustable and 1.225v output variants. features ? small packages: sot23, sc70-5 ? no output capacitor required ? output voltage tolerance ? lm4041c 0.5% at 25c ? lm4041d 1% at 25c ? low output noise 20vrms (10hz to 10khz) ? wide operating current range 60a to 12ma ? extended temperature range -40c to +125c ? low temperature coefficient 100ppm/c (max) applications ? battery powered equipment ? precision power supplies ? portable instrumentation ? portable communications devices ? notebook and palmtop computers ? data acquisition systems pin assignments lm4041_f (sot23) pin 3 must left floating or connected to pin 2. lm4041_adjf?.(sot23) lm4041_h5 (sc70-5) pin 2 must be left floating or connected to pin 1 lm4041_adjh5 (sc70-5) 3 n/c cathode 1 anode 2 3 anode ref 1 cathode 2 5 n/c anode 1 cathode 3 n/c 2 4 n/c 5 ref 4 n/c n/c 1 a node 2 cathode 3
lm4041 precision micropower shunt voltage references lm4041 document number: ds32020 rev. 7 - 2 2 of 7 www.diodes.com december 2010 ? diodes incorporated absolute maximum ratings description rating unit continuous reverse current (i r ) 20 ma continuous forward current (i f ) 10 ma maximum output voltage (lm4041_adj) 15 v junction temperature -40 to 155 c storage temperature -55 to 150 c esd ratings human body model 4000 v machine model 200 v these are stress ratings only. operation outside the absolute ma ximum ratings may cause device failure. operation at the absolu te maximum rating, for extended periods may reduce device reliability. semiconductor devices are esd sensitive and may be damaged by expos ure to esd events. suitable esd precautions should be taken when handling and transporting these devices. package thermal data package ja p dis t a = 25c, t j = 150c sot23 380c/w 330mw sc70-5 420c/w 300mw recommended operating conditions parameter min max units reverse current 0.06 12 ma output voltage range 1.24 10 v operating ambient tem perature range -40 125 qc
lm4041 precision micropower shunt voltage references lm4041 document number: ds32020 rev. 7 - 2 3 of 7 www.diodes.com december 2010 ? diodes incorporated electrical characteristics lm4041-1.2 electrical characteristics over recommended operating conditions, t a = 25 c, unless otherwise stated, i rmin < i r < 12ma, v ref < v out < 10v. lm4041c and lm4041d have initial tolerances of 0.5% and 1% respectively. symbol parameter conditions typ lm4041c limits lm4041d limits units t a v ref reverse breakdown voltage i r = 100 a 25c 1.225 v reverse breakdown voltage tolerance 25c 6 12 mv -40 to 85c 14 24 -40 to 125c 18.4 31 i rmin minimum operating current 25c 45 60 65 a -40 to 85c 65 70 -40 to 125c 68 73 v r /? average reverse breakdown voltage temperature coefficient i r = 10 ma -40 to 125c 20 ppm/c i r = 1 ma, 15 100 150 i r = 100 a 15 v r /? r reverse breakdown change with current i rmin < i r < 1ma 25c 0.7 1.5 2.0 mv -40 to 85c 2.0 2.5 -40 to 125c 2.0 2.5 1ma < i r < 12 ma 25c 2.5 6.0 8.0 -40 to 85c 8.0 10.0 -40 to 125c 8.0 10.0 z r dynamic output impedance i r = 1ma, f = 120hz i a c = 0.1i r 0.5 1.5 2.0 e n noise voltage i r = 100a 10hz < f < 10khz 20 v rms v r long term stability (non cumulative) t = 1000hrs i r = 100a 120 ppm lm4041-adj electrical characteristics over recommended operating conditions, t a = 25 c, i rmin < ?i r < 12 ma, v ref < v out < 10v unless otherwise stated. the grade d designates initial reference voltage tolerance of 1% and is measured at an output/cathode voltage of 5v. symbol parameter conditions typ lm4041d limits units t a v ref reverse breakdown voltage i r = 100 a, v ka = 5v 25c 1.233 v reverse breakdown voltage tolerance 25c 12 mv -40 to 85c 24 -40 to 125c 30 i rmin minimum operating current 25c 45 65 a -40 to 85c 70 -40 to 125c 73 v r /? average reverse breakdown voltage temperature coefficient i r = 10 ma -40 to 125c 20 ppm/c i r = 1 ma, 15 150 i r = 100 a 15 v r / v k reference voltage change with cathode voltage change i r = 1ma 25c -1.55 -2.5 mv/v -40 to 85c -3.0 -40 to 125c -4.0 i ref reference input current 25c 60 150 na -40 to 85c 200 -40 to 125c 200 v r /? r reverse breakdown change with current i rmin < i r < 1ma v out > 1.6v 25c 0.7 2.0 mv -40 to 85c 2.5 -40 to 125c 2.5 1ma < i r < 12 ma v out > 1.6v 25c 2 6.0 -40 to 85c 8.0 -40 to 125c 10.0 z r dynamic output impedance i r = 1ma, f = 120hz i a c = 0.1i r v ka = v ref 0.5 v ka = 10v 2 e n noise voltage i r = 100a 10hz < f < 10khz 20 v rms v r long term stability (non cumulative) t = 1000hrs i r = 100a 120 ppm
lm4041 precision micropower shunt voltage references lm4041 document number: ds32020 rev. 7 - 2 4 of 7 www.diodes.com december 2010 ? diodes incorporated typical characteristics lm4041 1.225 0.01 0.1 1 10 100 0.1 1 10 100 1000 frequency (khz) reference impedance ( ) 1ma, 1f tant 1ma, no cap 150ua, no cap 150ua, 1uf output impedance vs. frequency
lm4041 precision micropower shunt voltage references lm4041 document number: ds32020 rev. 7 - 2 5 of 7 www.diodes.com december 2010 ? diodes incorporated application information in a conventional shunt regulator application ( figure 1 ), an external series resistor (r s ) is connected between the supply voltage, v s , and the lm4041. r s determines the current that flows through the load (i l ) and the lm4041 (i r ). since load current and supply voltage may vary, r s should be small enough to supply at least the minimum acceptable i r to the lm4040 even when the supply voltage is at its minimum and the load current is at its maximum va lue. when the supply voltage is at its maximum and i l is at its minimum, r s should be large enough so that the current flowing through the lm4040 is less than 12 ma. r s is determined by the supply voltage, (v s ), the load and operating current, (i l and i q ), and the lm4040?s reverse breakdown voltage, v r . rl rs s ii vv r + ? = the lm4041 comes in two varients: ? lm4041 with fixed 1.225v output ? lm4041_adj with variable output voltage. the lm4041-adj?s output voltage can be adjusted to any value in the range of 1.24v through 10v. the output voltage is set by the ratio of two external feedback resistors as shown in figure 2 and the internal reference voltage (v r ). the output voltage is found using the equation: ? ? ? ? ? ? ? ? += 1 2 ro r r 1vv printed circuit board layout considerations lm4041 with fixed output voltage in the sot23 package has the die attached to pin 1, which results in an electrical contact between pin 2 and pin 1. therefore, pin 1 of the sot23 package must be left floating or connected to pin 2. lm4041 with fixed output voltage in the sc70-5 package have the die attached to pin 2, which results in an electrical contact between pin 2 and pin 1. therefore, pin 2 must be left floating or connected to pin1. r s v s i r + i l i r i l v r figure 1 r s v s i r + i l i r i l v r v o figure 2
lm4041 precision micropower shunt voltage references lm4041 document number: ds32020 rev. 7 - 2 6 of 7 www.diodes.com december 2010 ? diodes incorporated ordering information 25c tol voltage (v) order code pack part mark status reel size tape width quantity per reel 0.5% 1.225 lm4041cfta sot23 r1c active 7?, 180mm 8mm 3000 lm4041ch5ta sc70-5 r1c active 7?, 180mm 8mm 3000 1% 1.225 lm4041dfta sot23 r1d active 7?, 180mm 8mm 3000 lm4041dh5ta sc70-5 r1d active 7?, 180mm 8mm 3000 adj lm4041dadjfta sot23 rad active 7?, 180mm 8mm 3000 lm4041dadjh5ta sc70-5 rad active 7?, 180mm 8mm 3000 package outline information
lm4041 precision micropower shunt voltage references lm4041 document number: ds32020 rev. 7 - 2 7 of 7 www.diodes.com december 2010 ? diodes incorporated important notice diodes incorporated makes no warranty of any kind, express or implied, with regards to this document, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose (and their equivalents under the laws of any jurisdiction). diodes incorporated and its subsidiaries rese rve the right to make modifications, enhanc ements, improvements, corrections or ot her changes without further notice to this document and any product described herein. diodes incorporated does not assume any liabi lity arising out of the application or use of this document or an y product described herein; neither does diodes incorporated convey any license under its patent or trademark rights, nor the rights of othe rs. any customer or user of this document or products desc ribed herein in such applications shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on diodes incorp orated website, harmless against all damages. diodes incorporated does not warrant or accept any liability what soever in respect of any prod ucts purchased through unauthoriz ed sales channel. should customers purchase or use diodes in corporated products for any unintended or unauthorized application, customers shall indemnify and hold diodes incorporated and its representatives har mless against all claims, damages, expenses, and attorney fee s arising out of, directly or indirectly, any claim of personal injury or death a ssociated with such unintended or unauthorized a pplication. products described herein may be covered by one or more united states, international or foreign patents pending. product names and markings noted herein may also be covered by one or more united states, international or foreign trademarks. life support diodes incorporated products are specifica lly not authorized for use as critical co mponents in life support devices or systems without the express written approval of the chief executive officer of diodes incorporated. as used herein: a. life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when pr operly used in accordance with instructions for use provided in the labeling can be reasonably expected to re sult in significant injury to the user. b. a critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. customers represent that they have all necessary expertise in t he safety and regulatory ramifications of their life support dev ices or systems, and acknowledge and agree that they are solely responsi ble for all legal, regulatory and safety-related requirements concerning their products and any use of diode s incorporated products in such safety-cri tical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporated and its repr esentatives against any damages ar ising out of the use of diodes incorporated products in such safety-c ritical, life support devices or systems. copyright ? 2010, diodes incorporated www.diodes.com
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