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vfm step-up dc/dc converter controller rn5ryxx1 series 1 outline the rn5ryxx1 series are cmos-based vfm control ics for step-up dc/dc converter with an external dri- ver transistor featuring high output voltage accuracy and low supply current. each of the rn5ryxx1 series ics consists of a voltage reference unit, an error amplifier, an oscillator, a vfm control circuit and feed back resistors. a low ripple, high efficiency step -up dc/dc converter can be composed of the rn5ryxx1 series with only an inductor, a diode, a capacitor, and a drive transistor. since the package for these ics is sot-23-5( mini-mold)package, high density mounting of the ics on boards is possible. ? low supply current .................................................................................. typ. 3? ? low standby current .................................................................................. typ. 0.6? ? low temperature-drift coefficient of output voltage ........................... typ. ?0ppm / ?c ? high accuracy output voltage ................................................................... ?.5% ? low oscillation start-up voltage ............................................................... max. 0.8v ? small package ............................................................................................. sot-23-5(mini-mold) features applications ? power source for battery-powered instruments. ? power source for cameras, vcrs, camcorders, pagers, and other hand-held communication instruments. block diagram + 5 3 1 2 vr e f osc output buffer ce ext v out gnd no. ea-030-0204
rn5ryxx1 2 designation of output voltage (v out ) v out can be designated within the range of 2.0 to 6.0v code rn5ryxxxx ? xx part number abc d selection guide in the rn5ryxx1 series, the output voltage, the version and the taping type for the ics can be selected at the user's request. the selection can be made by designating the part number as shown below : } for example, the product with output voltage 2.0v, taping type tr, is designated by part number rn5ry201a tr. a b 1 c designation of packing type: a: taping c: antistatic bag for samples d designation of taping type: ex. sot-23-5: tr, tl (refer to taping specification) ?r?is prescribed as a standard contents }
rn5ryxx1 3 ground pin pin no. pin configuration pin description ? sot-23-5 12 3 54 (mark side) symbol description 1 gnd 2 v out output pin 3 ext external transistor drive pin (cmos output) 4 nc no connection 5 ce chip enable pin
rn5ryxx1 4 symbol absolute maximum ratings item ratings unit v in input voltage +12 v v ce ce pin input voltage 0.3 to v out +0.3 v v ext ext pin output voltage 0.3 to v out +0.3 v i ext ext pin output current ?0 ma p d power dissipation 150 30 to +85 mw topt operating temperature ?c 55 to +125 tstg storage temperature ?c 260?c, 10s tsolder lead temperature (soldering) absolute maximum ratings are threshold limit values that must not be exceeded even for an instant under any conditions. moreover, such values for any two items must not be reached simultaneously. operation above these absolute maximum ratings may cause degradation or permanent damage to the device. these are stress ratings only and do not necessarily imply functional operation below these limits. absolute maximum ratings
rn5ryxx1 5 symbol electrical characteristics ?rn5ry301 topt=25?c item conditions min. typ. max. unit v out output voltage v in =1.5v,i out =10ma 2.925 3.000 3.075 v v in input voltage 10 5 v i dd1 supply current 1 ext no load, v out =3.15v, test circuits1 3 ? 50 i dd2 supply current 2 ext no load, v out =2.85v, test circuits1 25 ? 1.5 istandby standby current v out =1.5v, test circuits2 0.6 ? fosc maximum oscillator frequency v out =2.85v, test circuits3 180 kh z duty oscillator duty cycle v out =2.85v, ext high side, test circuits3 60 75 % 0.8 vstart i exth oscillator start -up voltage ext no load, test circuits4 0.7 v ? v out ? topt output voltage temperature coefficient ext ??output current i out =10ma 30?c topt 85?c v out =2.85v, v ext =gnd, test circuits5 ?0 ppm/?c ?.5 ma i extl ext ??output current v out =2.85v, v ext =2.85v, test circuits6 1.5 ma v ceh ce ??input voltage v out =2.85v, test circuits4 1.5 v v cel ce ??input voltage v out =2.85v, test circuits4 0.25 v i ceh ce ??input current ce=3.0v, test circuits7 0.1 0.0 ? i cel ce ??input current ce=gnd, test circuits8 0.1 0.0 ?
rn5ryxx1 6 symbol ?rn5ry401 topt=25?c item conditions min. typ. max. unit v in input voltage 10 5 v i dd1 supply current 1 ext no load, v out =4.2v, test circuits1 3 ? 90 i dd2 supply current 2 ext no load, v out =3.8v, test circuits1 50 ? 1.5 istandby standby current v out =2.0v, test circuits2 0.6 ? fosc maximum oscillator frequency v out =3.8v, test circuits3 180 kh z duty oscillator duty cycle v out =3.8v, ext high side, test circuits3 60 75 % 0.8 vstart oscillator start - up voltage ext no load, test circuits4 0.7 v ? v out ? topt output voltage temperature coefficient i out =10ma 30?c topt 85?c ?0 ppm/?c ?.5 i exth ext ??output current v out =3.8v, v ext =gnd, test circuits5 ma i extl ext ??output current v out =3.8v, v ext =3.8v, test circuits6 1.5 ma v ceh ce ??input voltage v out =3.8v, test circuits4 1.5 v 0.25 v cel ce ??input voltage v out =3.8v, test circuits4 v 0.1 i ceh ce ??input current ce=4.0v, test circuits7 0.0 ? i cel ce ??input current ce=gnd, test circuits8 0.1 0.0 ? v out output voltage v in =2.0v, i out =10ma 3.900 4.000 4.100 v
rn5ryxx1 7 symbol ?rn5ry501 topt=25?c item conditions min. typ. max. unit v in input voltage 10 v i dd1 supply current 1 ext no load, v out =5.25v, test circuits1 3 5 ? i dd2 supply current 2 ext no load, v out =4.75v, test circuits1 90 150 ? istandby standby current v out =2.5v, test circuits2 0.6 1.5 ? fosc maximum oscillator frequency v out =4.75v, test circuits3 180 kh z duty oscillator duty cycle v out =4.75v, ext high side, test circuits3 60 75 % v start oscillator start-up voltage ext no load, test circuits4 0.7 0.8 v ? v out ? topt output voltage temperature coefficient i out =10ma ?0?c topt 85?c ?0 ppm/?c i exth ext ??output current v out =4.75v, v ext =gnd, test circuits5 ?.5 ma i extl ext ??output current v out =4.75v, v ext =4.75v, test circuits6 1.5 ma v ceh ce ??input voltage v out =4.75v, test circuits4 1.5 v v cel ce ??input voltage v out =4.75v, test circuits4 0.25 v i ceh ce ??input current ce=5.0v, test circuits7 0.0 0.1 ? i cel ce ??input current ce=gnd, test circuits8 ?.1 0.0 ? v out output voltage v in =2.5v, i out =10ma 4.875 5.000 5.125 v
rn5ryxx1 8 test circuit oscilloscope oscilloscope gnd ext nc gnd ext nc gnd v out ext nc ce a oscilloscope gnd ext nc gnd ext nc a oscilloscope gnd ext nc gnd ext nc a gnd ext nc a v out ce v out ce v out ce v out ce v out ce v out ce v out ce test circuit 1 test circuit 4 test circuit 2 test circuit 5 test circuit 3 test circuit 7 test circuit 6 test circuit 8
rn5ryxx1 9 4.00 3.00 2.00 0 100 200 300 400 500 output current i out (ma) output voltage v out (v) 0.8v 0.9v 1.0v 1.5v v in= 2.0v l=27 h rn5ry301 4.00 3.00 2.00 0 100 200 300 400 500 output current i out (ma) 0.8v 0.9v 1.0v 1.5v v in= 2.0v l=68 h rn5ry301 output voltage v out (v) 5.00 4.00 3.00 0 100 200 300 400 500 600 output current i out (ma) output voltage v out (v) l=27 h rn5ry401 0.9v 0.8v 1.0v 2.0v v in= 3.0v 3.00 4.00 5.00 0 100 200 300 400 500 600 output current i out (ma) l=68 h rn5ry401 0.9v 1.0v 2.0v v in= 3.0v 0.8v output voltage v out (v) 6.00 5.00 4.00 0 100 200 300 400 500 600 700 output current i out (ma) output voltage v out (v) l=27 h rn5ry501 0.8v 0.9v 1.0v 2.0v 3.0v v in= 4.0v output current i out (ma) 6.00 5.00 4.00 0 100 200 300 400 500 600 700 l=68 h rn5ry501 0.8v 0.9v 1.0v 2.0v 3.0v v in= 4.0v output voltage v out (v) typical characteristics 1) output voltage vs. output current
rn5ryxx1 10 0 0 100 200 300 400 500 output current i out (ma) effciency (%) l=27 h rn5ry301 10 20 30 40 50 60 70 80 90 100 0.8v 1.0v 1.5v v in= 2.0v 0.9v 0 0 100 200 300 400 500 output current i out (ma) effciency (%) l=68 h rn5ry301 10 20 30 40 50 60 70 80 90 100 1.0v v in= 2.0v 0.8v 0.9v 1.5v 0 0 100 200 300 400 500 600 output current i out (ma) effciency (%) l=27 h rn5ry401 0.8v 10 20 30 40 50 60 70 80 90 100 0.9v 1.0v 2.0v v in =3.0v 0 0 100 200 300 400 500 600 output current i out (ma) effciency (%) l=68 h rn5ry401 10 20 30 40 50 60 70 80 90 100 0.8v 0.9v 1.0v 2.0v v in =3.0v 0 0 100 200 300 400 500 600 700 output current i out (ma) effciency (%) l=27 h rn5ry501 10 20 30 40 50 60 70 80 90 100 3.0v v in =4.0v 0.8v 0.9v 1.0v 2.0v 0 0 output current i out (ma) effciency (%) l=68 h rn5ry501 10 20 30 40 50 60 70 80 90 100 100 200 300 400 500 600 700 0.8v 0.9v 1.0v 2.0v 3.0v v in =4.0v 2) efficiency vs. output current
rn5ryxx1 11 0 0 output current i out (ma) ripple voltage vr(mvp-p) l=27 h rn5ry301 100 200 300 400 500 50 100 150 200 250 300 350 0.8v 0.9v v in =2.0v 1.0v 1.5v 0 0 output current i out (ma) ripple voltage vr(mvp-p) l=27 h rn5ry401 100 200 300 400 100 200 300 400 500 600 0.8v 0.9v 2.0v v in= 3.0v 1.0v 0 100 200 300 400 500 0 output current i out (ma) ripple voltage vr(mvp-p) l=27 h rn5ry501 100 200 300 400 500 600 700 0.8v 0.9v 1.0v 2.0v 3.0v v in= 4.0v 3) ripple voltage vs. output current
rn5ryxx1 12 application hints l1 d1 v out ce gnd v out v in + c2 + c1 + c3 cb rb q1 ext rn5ryxx1 typical applications components : inductor (l1) : cd105 diode (d1) : d1fs4a (schottky type) capacitor (c1) : 33f (tantalum type) capacitor (c2) : 47f (tantalum type) capacitor (c3) : 47f (tantalum type) transistor (q1) : 2sd1628g base resistor (rb) : 220 ? base capacitor (cb) : 2200pf ?a spike-shaped voltage higher than output voltage may be applied to the driver transistor. therefore, care should be paid regarding its absolute maximum ratings (v ds , v cf ). we recommend to use a transistor having absolute maxi- mum ratings of at least twice the set output voltage. ?we also recommend the use of an output capacitor with an allowable voltage which is at least 1.5 times the set out- put voltage. this is because there may be the case where a spike-shaped voltage higher than the set output voltage is generated. use capacitor with good high frequency characteristics such as tantalum capacitor. ?choose such an inductor that a sufficiently small d.c. resistance and large allowable current, and hardly reaches magnetic saturation. ?use a diode of a schottky type with high switching speed, and also take care of the rated current. ?set external components as close as possible to the ic and minimize the current between the components and the ic. in particular, make minimum connection with the output capacitor. ?make sufficient grounding. a large current flows through gnd pin by switching. when the impedance of the gnd connection is high, the potential within the ic is varied by the switching current. this may result in unstable opera- tion of the ic.

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