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3a , 18v, buck regulator nr120e series sanken electric co., ltd. may / 16 /201 2 rev.0. 3 1 http://www.sanken - ele.co.jp eneral descriptions the nr 120 e series is buck regulator ics integrates high - side power mosfet. with the current mode control, ultra low esr capacitors such as ceramic capacitors can be used. the ics have protection functions such as o ver - c urrent p rotection (ocp) , u nder - v oltage l ockout (uvlo) and t hermal s hutdown (tsd) . an adjustable soft - start by an external capacitor prevents the excessive inrush current at turn - on. t he ic s integrate phase compensation circuit which reduces the number of external component s and simplifies the design of customer application . the on/off pin (en pin ) turns the regulator on or off and helps to achieve low power consumption requirements. the nr 120e series is available in a n 8 - pin soic package with an exposed thermal pad on the b ack side. features & benefit s ? current mode pwm control ? up to 94 % efficiency ? stable with low esr ceramic output capacitors ? built - in protection function over current protection (ocp) thermal shutdown (tsd) under voltage lockout (uvlo) ? built - in phase compens ation ? adjustable soft - start with an external capacitor ? turn on/of the regulator function package ? exposed soic 8 thermally enhanced 8 - pin package electrical characteristics ? 3a output current ? operating input range v in = 4.5v 18v ? output adj ustable v o = 0.8v 14v ? fixed 350khz frequency applications ? lcd tv / blu - ray / set top box ? green electronic products ? other power supply typical application c ircuit arial 10p t k c1 , c 2: 10f o =3.3v ) c 10 : 0.1 vo v c 2 d 1 c 10 l 1 c 4 r 5 r 6 c 9 r 1 gnd gnd sw _ s vo _ s nr 121 e in bs sw ss gnd nc fb en 1 3 4 7 2 8 6 5 r 3 r 4 c 1 c 5 in v in
3a , 18v, buck regulator nr120e series sanken electric co., ltd. may / 16 /201 2 rev.0. 3 2 http://www.sanken - ele.co.jp series l ineup product no. f sw v in v o i o NR121E 350khz 4.5v t o 18v (1) 0.8v to 14v (2) 3a ( 1) the minimum input voltage shall be either of 4.5v or v o +3v, whichever is higher. (2) t he i/o condition limited by the minimum on - time ( t on( min ) ). absolute m aximum r atings parameter symbol ratings units conditions dc in put voltage v in 20 v power dissipation (3) p d 1.76 w glass - epoxy board mounting in a 3030mm. (copper area in a 2525mm) max t j =150c junction temperature (4) t j ? 40 to 150 c storage temperature t s ? 40 to 150 c thermal resistance (junction - pin no. 4 ) jp 26 c /w thermal resistance (junction - ambient air) ja 7 1 c /w glass - epoxy board mounting in a 3030mm. (copper area in a 2525mm) (3) limited by thermal shutdown. (4) the temperature detection of thermal shutdown is about 160c recommended operating cond itions parameter symbol ratings units conditions min max dc input voltage (5) v in vo+3 18 v dc output current (6) (7) io 0 3.0 a output voltage vo 0.8 14 v ambient o perating temperature (7) top ? 40 85 c (5) the minimum value of input voltag e is taken as the larger one of either 4.5 v or v o + 3v. in the case of v in =v o +1 v o +3v , it is set to i o = max. 2a (6) recommended circuit refer s to typical application circuit . (7) to be used within the allowable package power dissipation characteristics
3a , 18v, buck regulator nr120e series sanken electric co., ltd. may / 16 /201 2 rev.0. 3 3 http://www.sanken - ele.co.jp electrical c haracteristics ta = 25c parameter symbol ratings units test conditions m i n t y p m a x reference voltage v ref 0.784 0.800 0.816 v v in = 12v i o = 1.0a output voltage temperature coefficient S v ref / S t D 0.05 D mv/c v in = 12v, i o = 1.0a ? 40 c to +85 c swi tching frequency nr 121 e f sw 280 350 420 khz v in =12v, v o =3.3v, i o =1a line regulation (8) v line D 50 D mv v in = 6.3v 18v, v o = 3.3v, i o = 1a load regulation (8) v load D 50 D mv v in = 12v, v o = 3.3v, i o = 0.1a 3.0a over current protection threshold i s 3.1 D 6.0 a v in = 12v, v o = 3.3v supply current i in D 6 D ma v in = 12v v en =10k pull up to v in shutdown supply current i in(off) 0 D 10 a v in =12v, i o =0a, v en =0v ss pin source current at low level voltage i en/ss 6 10 14 a v ss =0v, v in =12v high level voltage v ssh D 3.0 D v v in =12v en pin sink current i en 50 100 a v en = 10v threshold voltage v c/eh 0.7 1.4 2.1 v v in =12v max on - d uty (8) d max D 90 D % minimum on - time nr 121 e (8) (9) t on( min ) D 150 D nsec thermal shutdown threshold tempe rature (8) tsd 151 165 D c thermal shutdown restart hysteresis of temperature (8) tsd_hys D 20 D c (8) guaranteed by design, not tested. (9) the i/o characteristic are limited by the t on( min ) .
3a , 18v, buck regulator nr120e series sanken electric co., ltd. may / 16 /201 2 rev.0. 3 4 http://www.sanken - ele.co.jp typical performance characteristics nr 121 e typical per formance characteristics efficiency v o = 3.3v , l=10u h v o = 5 v , l=10u h 60 65 70 75 80 85 90 95 100 0 0.5 1 1.5 2 2.5 3 efficiency [%] output current : io [a] vin=8v vin=12v vin=18v 60 65 70 75 80 85 90 95 100 0 0.5 1 1.5 2 2.5 3 efficiency [%] output current : io [a] vin=8v vin=12v vin=18v
3a , 18v, buck regulator nr120e series sanken electric co., ltd. may / 16 /201 2 rev.0. 3 5 http://www.sanken - ele.co.jp nr 121 e typical performance characteristics over current protection output startup load regulation v o =3.3 v v o =3.3v , load = c onstant resistance, i o =0.5a v o =3.3v v o =3.3v supply current switching frequency v o =3.3v v en =0v shutdown supply current 3.25 3.27 3.29 3.31 3.33 3.35 0 1 2 3 output voltage vo [v] output current : io [a] vin=8v vin=12v vin=18v 300 310 320 330 340 350 360 370 380 390 400 0 1 2 3 switching frequency [khz] output current : io [a] vin=8v vin=12v vin=18v 0 1 2 3 4 0 1 2 3 4 5 output voltage vo [v] output current : io [a] vin=8v vin=12v vin=16v 0 0.5 1 1.5 2 2.5 3 3.5 4 3 3.5 4 4.5 5 5.5 6 output voltage vo [v] input voltage : v in [v] 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 0 2 4 6 8 10 12 14 16 18 shutdown supply current [ a] input voltage : v in [v] 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 0 2 4 6 8 10 12 14 16 18 supply current [ma] input voltage : v in [v]
3a , 18v, buck regulator nr120e series sanken electric co., ltd. may / 16 /201 2 rev.0. 3 6 http://www.sanken - ele.co.jp functional block diagram pin a ssignments & functions pin assignments pin functions pin no. symbol description 1 bs high - side boost input. bs supplies the drive for high - side nch - mosfet switch. connect a capacitor and a resistor between sw to bs. 2 in power i nput . in supplies the power to the ic.as well as the regulator switches 3 sw power s witching o utput . sw supplies power to the output. connect the lc filter from sw to the output. note that a capacitor is required from sw to bs to supply the power the hig h - side switch 4 gnd ground connect the exposed pad to pin no.4 5 fb feedback input pin to compare reference voltage . the feedback threshold is 0.8v. to set the output voltage, fb pin is required to connect between resistive voltage divider r1 and r2. 6 nc no connection . 7 en enable input. drive en pin high to turn on the regulator, low to turn it off. 8 ss soft - start control input. to set the soft - start period, connect to a capacitor between gnd. p . reg current sense amp osc drive reg pwm logic bs sw fb nc en err amp in v in 0 . 8 v c 10 l 1 d 1 7 6 5 3 1 2 gnd 4 8 ss ocp on / off vref 0 . 8 v c 9 uvlo ss tsd d 2 option ) compensation r 3 r 6 c 4 r 5 r 4 c 2 r 1 v o c 1 c 5 m 1
3a , 18v, buck regulator nr120e series sanken electric co., ltd. may / 16 /201 2 rev.0. 3 7 http://www.sanken - ele.co.jp typical a pplication c ircuit external components design guide (1)diode d1 ? the schottky - barrier diode must be used for d1. if other diodes like fast recovery diodes are used, ic may be damaged because of the reverse voltage applied by the recovery voltage or on voltage. (2)choke coil l1 ? if the winding resistance of the choke coil is too high, the efficiency may go down to the extent that it is out of the rating. ? as the start current of the over current protection is approximately 4a, attention must be paid to the heating of the choke coil by the magnetic saturation due to ove rload or short - circulated load. (3)capacitor c1 (c2) , c4(c5), c 9 ? as large ripple current s across c1 (c2) and c4 (c5) , capacitors with high frequency and low impedance for smps must be used. esp ecially when the impedance of c4 (c5) is high, the switching w aveform may not be normal at low temperature. ? c9 is a capacitor for soft start. in case soft start function is not used, please keep no.2 pin open. (4)resistor r 4, r5, r 6 ? r 4, r5, r6 are resistor to the output voltage. i adj is required to set to 0.2ma. r4, r5, r6 are calculated by the equation (1). ------- (1) in order to have optimum operating condition, each component must be connected with the minimum distance. c1 , c 2: 10f o =3.3v ) c 10 : 0.1 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? k 0 . 4 3 10 2 . 0 8 . 0 adj i fb v 6 r 3 10 2 . 0 8 . 0 o v adj i fb v o v 5 r 4 r P vo v c 2 d 1 c 10 l 1 c 4 r 5 r 6 c 9 r 1 gnd gnd sw _ s vo _ s nr 121 e in bs sw ss gnd nc fb en 1 3 4 7 2 8 6 5 r 3 r 4 c 1 c 5 in v in
3a , 18v, buck regulator nr120e series sanken electric co., ltd. may / 16 /201 2 rev.0. 3 8 http://www.sanken - ele.co.jp allowab le package power dissipation notes 1) glass - epoxy board mounting in a 3030mm 2) c o pper area : 2525mm 3) the power dissipation is calculated at the junction temperature 125 c 4) losses can be calculated by the following equation. as the efficiency is subject to the input voltage and output current, it shall be obtained from the efficiency curve and substituted in percent 5) thermal design for d1 shall be made separately. v o : output voltage v in : input voltage i o : output current f : diode forward voltage sjpb - l4 ? o =3a) ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? in v o v 1 o i f v 1 x 100 o i o v d p
3a , 18v, buck regulator nr120e series sanken electric co., ltd. may / 16 /201 2 rev.0. 3 9 http://www.sanken - ele.co.jp pcb layout & recommended land pattern (1)each ground of all components is connected as close as possible to the pin no. 4 at one point. (2) to help heat dissipation , connect a large copper plane to exposed pad on the back side of the package. the copper plane is required for gnd note s: real size of the pcb is 60mm60 mm notes: 1) dimension is in millimeters, dimension in bracket is in inches. 2) drawing is not to scale. front side: component side (double sided board) back side: gnd side (double sided board) recommended land pattern 0.61 (0.024) 1.27 (0.050) 2.35 (0.092) 5.40 (0.213) 3.24 (0.127) 1.60 (0.063)
3a , 18v, buck regulator nr120e series sanken electric co., ltd. may / 16 /201 2 rev.0. 3 10 http://www.sanken - ele.co.jp package outline exposed soic8 package notes: 1) dimensi on is in millimeters , dimension in bracket is in inches. 2) drawing is not to scale. 3) pb - free : device composition compl y with the rohs directive. package marking top view bottom view front view side view nr12 1e sk ymw part number lot number sanken control number y= last digit of the year (0 - 9) m= month (1 - 9, o, n, or d) w= week code (1 - 3) xxxx 2.16 0.127 (0.085 0.005 ) 3.18 0.127 (0.120 0.005 ) 3.89 (0.153) 3.73 (0.147) 0.508(0.020) 0.330(0.130) 6.918(0.244) 5.893(0.232) 1.27( 0.050) bsc 1.448 0.05 (0.057 0.002 ) 0.1524(0.006 ) 0.000(0.000) 4.902 0.102 (0.193 0.004) 0.102 (0.004)
3a , 18v, buck regulator nr120e series sanken electric co., ltd. may / 16 /201 2 rev.0. 3 11 http://www.sanken - ele.co.jp o perating precautions r eliability can be affected adversely by impro per storage environment s and handling methods . p lease observe the following cautions. cautions for storage ? ensure that storage conditions comply with the standard temperature (5 to 35 c ) and the standard relative humidity (around 40 to 75%) ; avoid storage locations that experience extreme changes in temperature or humidity. ? avoid locations where dust or harmful gases are present and avoid direct sunlight. ? reinspect for rust on leads and solderability of products that have been stored for a long time. caut ions for testing and handling ? when tests are carried out during inspection testing and other standard test periods, protect the products from power surges from the testing products, shorts between the product pins, and wrong connections. in addition, avoid tests exceeded ratings soldering when soldering the products, please be sure to minimize the working time, within the following limits. ? reflow preheat ; 180 c / 9 0 30 s heat ; 250 c / 10 1s (260 c peak ,2times) ? soldering iron ; 38010c / 3 .5 0.5 s ( 1time ) electrostatic discharge ? when handling the products, the operator must be grounded. grounded wrist straps worn should have at least 1m of resistance from the operator to ground to prevent shock hazard, and it should be placed near the operator. ? workbenches where the products are handled should be grounded and be provided with conductive table and floor mats. ? when using measuring equipm ent such as a curve tracer, the equipment should be grounded. ? when soldering the products, the head of a soldering irons or the solder bath must be grounded in order to prevent leak voltages generated by them from being applied to the products. ? the produc ts should always be stored and transported in sanken shipping containers or conductive containers, or be wrapped in aluminum foil.
3a , 18v, buck regulator nr120e series sanken electric co., ltd. may / 16 /201 2 rev.0. 3 12 http://www.sanken - ele.co.jp i m portants notes ? the contents in this document are subject to changes, for improvement and other purposes, without notice. m ake sure that this is the latest revision of the document before use. ? application and operation examples described in this document are quoted for the sole purpose of reference for the use of the products herein and sanken can assume no responsibility for any infringement of industrial property rights, intellectual property rights or any other rights of sanken or any third party which may result from its use. ? although sanken undertakes to enhance the quality and reliability of its products, the occurrence o f failure and defect of semiconductor products at a certain rate is inevitable. users of sanken products are requested to take, at their own risk, preventative measures including safety design of the equipment or systems against any possible injury, death, fires or damages to the society due to device failure or malfunction. ? sanken products listed in this document are designed and intended for the use as components in general purpose electronic equipment or apparatus (home appliances, office equipment, tele communication equipment, measuring equipment, etc.). when considering t he use of sanken products in the applications where higher reliability is required (transportation equipment and its control systems, traffic signal control systems or equipment, fire/crime alarm systems, various safety devices, etc.), please contact your nearest sanken sales representative to discuss, prior to the use of the products herein. the use of sanken products without the written consent of sanken in the applications where extremely high reliability is required (aerospace equipment, nuclear power c ontrol systems, life support systems, etc.) is strictly prohibited. ? in the case that you use sanken semiconductor products or design your products by using sanken semiconductor products , the reliability largely depends on the degree of derating to be made to the rated values. derating may be interpreted as a case that an operation range is set by derating the load from each rated value or surge voltage or noise is considered for derating in order to assure or improve the reliability. in general, derating fa ctors include electric stresses such as electric voltage, electric current, electric power etc., environmental stresses such as ambient temperature, humidity etc. and thermal stress caused due to self - heating of semiconductor products . for these stresses, instantaneous values, maximum values and minimum values must be taken into consideration. in addition, it should be noted that since power devices or ics including power devices have large self - heating value, the degree of derating of junction temperatur e affects the reliability significantly. ? when using the products specified herein by either (i) combining other products or materials therewith or (ii) physically, chemically or otherwise processing or treating the products, please duly consider all possib le risks that may result from all such uses in advance and proceed therewith at your own responsibility. ? anti radioactive ray design is not considered for the products listed herein. ? sanken assumes no responsibility for any troubles, such as dropping produ cts caused during transportation out of sanken s distribution network . ? the contents in this document must not be transcribed or copied without sankens written consent.

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