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3.0 a, adjustable output, positive voltage regulator the lm350 is an adjustable threeterminal positive voltage regulator capable of supplying in excess of 3.0 a over an output voltage range of 1.2 v to 33 v. this voltage regulator is exceptionally easy to use and requires only two external resistors to set the output voltage. further, it employs internal current limiting, thermal shutdown and safe area compensation, making it essentially blowout proof. the lm350 serves a wide variety of applications including local, on card regulation. this device also makes an especially simple adjustable switching regulator, a programmable output regulator, or by connecting a fixed resistor between the adjustment and output, the lm350 can be used as a precision current regulator. ? guaranteed 3.0 a output current ? output adjustable between 1.2 v and 33 v ? load regulation typically 0.1% ? line regulation typically 0.005%/v ? internal thermal overload protection ? internal short circuit current limiting constant with temperature ? output transistor safe area compensation ? floating operation for high voltage applications ? standard 3lead transistor package ? eliminates stocking many fixed voltages simplified application * = c in is required if regulator is located an appreciable distance from power supply filter. ** = c o is not needed for stability, however, it does improve transient response. since i adj is controlled to less than 100 m a, the error associated with this term is negligible in most applications. lm350 v in v out r 1 240 r 2 adjust i adj c in * 0.1 m f + c o ** 1 m f v out 1.25v 1 r 2 r 1 i adj r 2 on semiconductor ? semiconductor components industries, llc, 2002 january, 2002 rev. 2 1 publication order number: lm350/d lm350 semiconductor technical data threeterminal adjustable positive voltage regulator ordering information t suffix plastic package case 221a pin 1. adjust 2. v out 3. v in heatsink surface is connected to pin 2. device operating temperature range package lm350t lm350bt# plastic power plastic power t j = 0 to +125 c t j = 40 to +125 c # automotive temperature range selections are available with special test conditions and additional tests. contact your local on semiconductor sales office for information. 3 1 2
lm350 http://onsemi.com 2 maximum ratings rating symbol value unit inputoutput v oltage dif ferential v i v o 35 vdc power dissipation p d internally limited w operating junction temperature range t j 40 to +125 c storage temperature range t stg 65 to +150 c soldering lead temperature (10 seconds) t solder 300 c electrical characteristics (v i v o = 5.0 v; i l = 1.5 a; t j = t low to t high ; p max [note 1], unless otherwise noted.) characteristics figure symbol min typ max unit line regulation (note 2) t a = 25 c, 3.0 v v i v o 35 v 1 reg line 0.0005 0.03 %/v load regulation (note 2) t a = 25 c, 10 ma i l 3.0 a v o 5.0 v v o 5.0 v 2 reg load 5.0 0.1 25 0.5 mv % v o thermal regulation, pulse = 20 ms, (t a = +25 c) reg therm 0.002 % v o /w adjustment pin current 3 i adj 50 100 m a adjustment pin current change 3.0 v v i v o 35 v 10 ma i l 3.0 a, p d p max 1,2 d i adj 0.2 5.0 m a reference voltage 3.0 v v i v o 35 v 10 ma i o 3.0 a, p d p max 3 v ref 1.20 1.25 1.30 v line regulation (note 2) 3.0 v v i v o 35 v 1 reg line 0.02 0.07 %/v load regulation (note 2) 10 ma i l 3.0 a v o 5.0 v v o 5.0 v 2 reg load 20 0.3 70 1.5 mv % v o temperature stability (t low t j t high ) 3 t s 1.0 % v o minimum load current to maintain regulation (v i v o = 35 v) 3 i lmin 3.5 10 ma maximum output current v i v o 10 v, p d p max v i v o = 30 v, p d p max , t a = 25 c 3 i max 3.0 0.25 4.5 1.0 a rms noise, % of v o t a = 25 c, 10 hz f 10 khz n 0.003 % v o ripple rejection, v o = 10 v, f = 120 hz (note 3) without c adj c adj = 10 m f 4 rr 66 65 80 db long term stability, t j = t high (note 4) t a = 25 c for endpoint measurements 3 s 0.3 1.0 %/1.0 k hrs. thermal resistance, junctiontocase peak (note 5) average (note 6) r q jc 2.3 1.5 c/w notes: 1. t low to t high = 0 to +125 c; p max = 25 w for lm350t; t low to t high = 40 to +125 c; p max = 25 w for lm350bt 2. load and line regulation are specified at constant junction temperature. changes in v o due to heating effects must be taken into account separately. pulse testing with low duty cycle is used. 3. c adj , when used, is connected between the adjustment pin and ground. 4. since longterm stability cannot be measured on each device before shipment, this specification is an engineering estimate of average stability from lot to lot. 5. thermal resistance evaluated measuring the hottest temperature on the die using an infrared scanner. this method of evaluatio n yields very accurate thermal resistance values which are conservative when compared to the other measurement techniques. 6. the average die temperature is used to derive the value of thermal resistance junction to case (average).
lm350 http://onsemi.com 3 representative schematic diagram 310 310 230 120 5.6k v in 170 6.3v 160 12k 5.0pf 6.8k 13k 6.3v 105 4 0.45 v out adjust 12.5k 2.4k 30 pf 30 pf 6.3v 125k 135 190 12.4k 3.6k 5.8k 110 5.1k 6.7k 510 200 *pulse testing required: 1% duty cycleis suggested. line regulation (%/v) = v oh - v ol x 100 * v cc v ih v il v in v out v oh v ol r l + 1 m f c o 240 1% r 1 adjust r 2 1% c in 0.1 m f lm350 i adj i l figure 1. line regulation and d i ad j / line test circuit v ol
lm350 http://onsemi.com 4 *pulse testing required: 1% duty cycle is suggested. load regulation (mv) = v o (min load) -v o (max load) load regulation (% v o ) = v o (min load) - v o (max load) x 100 v o (min load) v o (max load) lm350 c in 0.1 m f adjust r 2 1% c o 1.0 m f + * r l (max load) r l (min load) v out r 1 240 1% v in v in i adj i l figure 2. load regulation and d i ad j / load test circuit v o (min load) pulse testing required: 1% duty cycle is suggested. lm350 v in v out adjust r 1 240 1% + 1.0 m f c o r l c in r 2 1% to calculate r 2 : v out = i set r 2 + 1.250 v assume i set = 5.25 ma i l i adj i set v ref v o v i 0.1 m f figure 3. standard test circuit lm350 v in v out v out = 10 v r l c in 0.1 m f adjust r 1 240 1% d 1 * 1n4002 c o + 1.0 m f 24v 14v r 2 1.65k 1% c adj 10 m f + *d 1 discharges c adj if output is shorted to ground. **c adj provides an ac ground to the adjust pin. f = 120 hz v o i l ** figure 4. ripple rejection test circuit
lm350 http://onsemi.com 5 ref v , reference voltage (v) i b , quiescent current (ma) i adj , adjustment pin current ( a) m v out , output voltage change (%) d figure 5. load regulation figure 6. current limit figure 7. adjustment pin current figure 8. dropout voltage figure 9. temperature stability figure 10. minimum operating current 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 -75 -50 -25 0 25 50 75 100 125 150 t j , junction temperature ( c) v in = 15 v v out = 10 v i l = 0.5 a i l = 1.5 a 7 5 3 1 0 010203040 v in -v out , input voltage differential (vdc) i out , output current (a) 70 65 60 55 50 45 40 35 -75 -50 -25 0 25 50 75 100 125 150 t j , junction temperature ( c) -75 -50 -25 0 25 50 75 100 125 150 t j , junction temperature ( c) 3.0 2.5 2.0 1.5 1.0 d v 0 = 100 mv i l = 3.0 a i l = 2.0 a i l = 500 ma i l = 200 ma i l = 20 ma -75 -50 -25 0 25 50 75 100 125 150 t j , junction temperature ( c) 1.260 1.250 1.240 1.230 1.220 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 10 203040 v in -v out , input-output voltage differential (vdc) t j = -55 c t j = 25 c t j = 150 c t j = 55 c t j = 150 c t j = 25 c v in -v out , input-output voltage differential (vdc)
lm350 http://onsemi.com 6 v out , output voltage d deviation (v) z o w , output impedance ( ) v out , output voltage d deviation (v) v in , input voltage d change (v) figure 11. ripple rejection versus output voltage figure 12. ripple rejection versus output current figure 13. ripple rejection versus frequency figure 14. output impedance figure 15. line transient response figure 16. load transient response 1.5 1.0 0.5 0 -0.5 -1.0 -1.5 1.0 0.5 0 010203040 t, time ( m s) c l = 1.0 m f; c adj = 10 m f c l = 0; without c adj v in v out = 10 v i l = 50 ma t j = 25 c 3 2 1 0 -1 -2 -3 1.5 1.0 0.5 0 010203040 t, time ( m s) i current (a) l , load c l = 0; without c adj c l = 1.0 m f; c adj = 10 m f v in = 15 v v out = 10 v i nl = 50 ma t j = 25 c i l 100 80 60 40 20 0 0 5 10 15 20 25 30 35 rr, ripple rejection (db) v out , output voltage (v) v in - v out = 5 v i l = 500 ma f = 120 hz t j = 25 c without c adj c adj = 10 m f 120 100 80 60 40 20 0 0.01 0.1 1 10 i out , output current (a) rr, ripple rejection (db) v in - v out = 5 v i l = 500 ma f = 120 hz t j = 25 c without c adj c adj = 10 m f without c adj 100 80 60 40 20 0 10 100 1.0 k 10 k 100 k 1.0 m 10 m rr, ripple rejection (db) f, frequency (hz) i l = 500 ma v in = 15 v v out = 10 v t j = 25 c c adj = 10 m f v in = 15 v v out = 10 v i l = 500 ma t j = 25 c c adj = 10 m f without c adj 10 1 10 0 10 -1 10 -2 10 -3 10 100 1.0 k 10 k 100 k 1.0 m f, frequency (hz) 140
lm350 http://onsemi.com 7 applications information basic circuit operation the lm350 is a threeterminal floating regulator. in operation, the lm350 develops and maintains a nominal 1.25 v reference (v ref ) between its output and adjustment terminals. this reference voltage is converted to a programming current (i prog ) by r 1 (see figure 17), and this constant current flows through r 2 to ground. the regulated output voltage is given by: r 2 v out = v ref (1 + ) + i adj r 2 r 1 since the current from the terminal (i adj ) represents an error term in the equation, the lm350 was designed to control i adj to less than 100 m a and keep it constant. to do this, all quiescent operating current is returned to the output terminal. this imposes the requirement for a minimum load current. if the load current is less than this minimum, the output voltage will rise. since the lm350 is a floating regulator, it is only the voltage differential across the circuit which is important to performance, and operation at high voltages with respect to ground is possible. + v ref adjust v in v out lm350 r 1 i prog v out r 2 i adj v ref = 1.25 v typical figure 17. basic circuit configuration load regulation the lm350 is capable of providing extremely good load regulation, but a few precautions are needed to obtain maximum performance. for best performance, the programming resistor (r 1 ) should be connected as close to the regulator as possible to minimize line drops which effectively appear in series with the reference, thereby degrading regulation. the ground end of r 2 can be returned near the load ground to provide remote ground sensing and improve load regulation. external capacitors a 0.1 m f disc or 1 m f tantalum input bypass capacitor (c in ) is recommended to reduce the sensitivity to input line impedance. the adjustment terminal may be bypassed to ground to improve ripple rejection. this capacitor (c adj ) prevents ripple from being amplified as the output voltage is increased. a 10 m f capacitor should improve ripple rejection about 15 db at 120 hz in a 10 v application. although the lm350 is stable with no output capacitance, like any feedback circuit, certain values of external capacitance can cause excessive ringing. an output capacitance (c o ) in the form of a 1 m f tantalum or 25 m f aluminum electrolytic capacitor on the output swamps this effect and insures stability. protection diodes when external capacitors are used with any ic regulator, it is sometimes necessary to add protection diodes to prevent the capacitors from discharging through low current points into the regulator. figure 18 shows the lm350 with the recommended protection diodes for output voltages in excess of 25 v or high capacitance values (c o > 25 m f, c adj > 10 m f). diode d 1 prevents c o from discharging thru the ic during an input short circuit. diode d 2 protects against capacitor c adj discharging through the ic during an output short circuit. the combination of diodes d 1 and d 2 prevents c adj from discharging through the ic during an input short circuit. d 1 v in c in 1n4002 lm350 v out r 1 + c o d 2 r 2 c adj 1n4002 adjust figure 18. voltage regulator with protection diodes
lm350 http://onsemi.com 8 figure 19. alaboratoryo power supply with adjustable current limit and output voltage figure 20. adjustable current limiter figure 21. 5.0 v electronic shutdown regulator figure 22. slow turnon regulator figure 23. current regulator d 6 1n4002 v in 32v v in1 lm350 (1) adjust 1 v out1 r sc v in2 v out 2 i o v o in4001 1n4001 240 d 5 1n4001 + 1.0 m f tantalum 1k current limit adjust q 1 2n3822 5.0k adjust 2 voltage adjust + 10 m f d 3 d 4 d 1 1n4001 q 2 2n5640 -10v output range: 0 v o 25 v 0 i o 1.5 a diodes d 1 and d 2 and transistor q 2 are added to allow adjustment of output voltage to 0 v. d 6 protects both lm350's during an input short circuit. 1n4001 d 2 -10v 0.1 m f lm350 (2) v ref +25v v in lm350 v out r 1 v out 620 adjust i out d 2 1n4001 2n5640 r 2 100 * to provide current limiting of i o to the system ground, the source of the fet must be tied to a negative voltage below -1.25 v. r 2 v ref r 1 = v ss * d 1 1n4001 v o < v (br)dss + 1.25 v + v ss i lmin - i dss < i o < 3.0 a as shown o < i o < 1.0 a v in d 1 1n4002 v out 120 adjust 720 + 1.0 m f mps2222 1.0k ttl control lm350 minimum v out = 1.25 v d 1 protects the device during an input short circuit. + 10 m f v in v out 240 1n4001 lm350 adjust mps2907 r 2 50k lm350 v in v out r 1 adjust i adj i out 1.25 v r 1 10 ma i out 3.0 a i dss i omax + i dss i out v ref r 1 i adj
lm350 http://onsemi.com 9 package dimensions t suffix plastic package case 221a09 issue aa notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: inch. 3. dimension z defines a zone where all body and lead irregularities are allowed. dim min max min max millimeters inches a 0.570 0.620 14.48 15.75 b 0.380 0.405 9.66 10.28 c 0.160 0.190 4.07 4.82 d 0.025 0.035 0.64 0.88 f 0.142 0.147 3.61 3.73 g 0.095 0.105 2.42 2.66 h 0.110 0.155 2.80 3.93 j 0.018 0.025 0.46 0.64 k 0.500 0.562 12.70 14.27 l 0.045 0.060 1.15 1.52 n 0.190 0.210 4.83 5.33 q 0.100 0.120 2.54 3.04 r 0.080 0.110 2.04 2.79 s 0.045 0.055 1.15 1.39 t 0.235 0.255 5.97 6.47 u 0.000 0.050 0.00 1.27 v 0.045 --- 1.15 --- z --- 0.080 --- 2.04 b q h z l v g n a k f 123 4 d seating plane t c s t u r j
lm350 http://onsemi.com 10 notes
lm350 http://onsemi.com 11 notes
lm350 http://onsemi.com 12 on semiconductor and are trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to make changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. atypicalo parameters which may be provided in scill c data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. all operating parameters, including atypicalso must be validated for each customer application by customer's technical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorized for use as components in systems intended for surgical implant into t he body, or other applications intended to support or sustain life, or for any other application in which the failure of the scillc product could create a sit uation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indem nify and hold scillc and its of ficers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and re asonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized u se, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employ er. publication ordering information japan : on semiconductor, japan customer focus center 4321 nishigotanda, shinagawaku, tokyo, japan 1410031 phone : 81357402700 email : r14525@onsemi.com on semiconductor website : http://onsemi.com for additional information, please contact your local sales representative. lm350/d literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 3036752175 or 8003443860 toll free usa/canada fax : 3036752176 or 8003443867 toll free usa/canada email : onlit@hibbertco.com n. american technical support : 8002829855 toll free usa/canada

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