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voltage regulator for middle output current 1 rx5re series outline the rx5re series are cmos-based voltage regulator ics with high output voltage accuracy and ultra- low quiescent current. each of these ics consists of a voltage reference unit, an error amplifier, a driver transistor, and resistors for setting output voltage, and a current limit circuit. by use of these ics, a con- stant voltage power supply circuit with high efficiency can be constructed because the dropout voltage and quiescent current of these ics are very small. furthermore, theses ics have a built-in current limit circuit. the output voltage of these ics is fixed with high accuracy. two types of packages, to-92 and sot-89 (mini-power mold) are available. ?ultra-low quiescent current ........................... typ. 1.1? (rx5re30a,v in =5.0v) ?ultra-low dropout voltage ............................... typ. 0.5v (rx5re50a,i out =60ma) ?large output current ...................................... typ. 120ma (rx5re50a) ?low temperature-drift coefficient of output voltage ........................... typ. ?00ppm/?c ?broad operating voltage range ...................... max. 10.0v ?excellent line regulation ................................ typ. 0.1%/v ?high accuracy output voltage ........................ ?.5% ?output voltage ................................................... stepwise setting with a step of 0.1v in the range of 2.0v to 6.0v is possible (refer to selection guide) ?two types of packages .................................. to-92, sot-89 (mini-power mold) features applications ? power source for battery-powered equipment. ? power source for cameras, video instruments such as camcorders, vcrs, and hand- held communication equipment. ? precision voltage references. block diagram 2 1 3 vref v out gnd v in + no. ea-016-0204
2 rx5re rx5rexxxx xx part number abcde selection guide the package type, the output voltage, the packing type, and the taping type of rx5re series can be designated at the user's request by specifying the part number as follows. } } for example, the product with package type sot-89,output voltage 5.0v,version a and taping type t1 are designated by part number rh5re50aa-t1. code contents designation of package type: a e: to-92 h: sot-89 (mini-power mold) b setting output voltage (v out ): stepwise setting with a step of 0.1v in the range of 2.0v to 6.0v is possible. ca designation of packing type: d a: taping c: antistatic bag for to-92 and samples designation of taping type: ex. to-92 : rf, rr, tz e sot-89: t1, t2 (refer to taping specifications) ?z?and ?1?are prescribed as a standard.
rx5re 3 ?to-92 pin configuration ?sot-89 pin description ?to-92 ?sot-89 pin no. symbol 1 gnd 2v in 3v out pin no. symbol 1 gnd 2v in 3v out 12 3 (mark side) 12 3 (mark side)
4 rx5re absolute maximum ratings symbol item v in input voltage v out output voltage i out output current p d power dissipation topt operating temperature tstg storage temperature tsolder lead temperature (soldering) rating unit +12 v ?.3 to v in +0.3 v 300 ma 300 mw ?0 to +85 ?c ?5 to +25 ?c 260?c, 10s 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
rx5re 5 electrical characteristics ?rx5re20a symbol item v out output voltage i out output current ? v out load regulation ? i out v dif dropout voltage i ss quiescent current ? v out ? v in line regulation v in input voltage ilim current limit ? v out output voltage ? topt temperature coefficient conditions min. typ. max. unit v in =4.0v,i out =10ma 1.950 2.000 2.050 v v in =4.0v 40 60 ma v in =4.0v 1ma i out 50ma 40 80 mv i out =30ma 0.5 0.7 v v in =4.0v 1.0 3.0 ? i out =10ma v out + 1.0v v in 10v 0.1 %/v 10 v 240 ma i out =10ma ?00 ppm/?c ?0?c topt 85?c topt=25?c ?rx5re30a topt=25?c symbol item v out output voltage i out output current ? v out load regulation ? i out v dif dropout voltage i ss quiescent current ? v out ? v in line regulation v in input voltage ilim current limit ? v out output voltage ? topt temperature coefficient conditions min. typ. max. unit v in =5.0v,i out =10ma 2.925 3.000 3.075 v v in =5.0v 50 80 ma v in =5.0v 1ma i out 60ma 40 80 mv i out =40ma 0.5 0.7 v v in =5.0v 1.1 3.3 ? i out =10ma v out +1.0v v in 10v 0.1 %/v 10 v 240 ma i out =10ma ?00 ppm/?c 40 ?c topt 85 ?c
6 rx5re ? rx5re50a topt=25?c ?rx5re40a topt=25?c symbol item v out output voltage i out output current ? v out load regulation ? i out v dif dropout voltage i ss quiescent current ? v out ? v in line regulation v in input voltage ilim current limit ? v out output voltage ? topt temperature coefficient conditions min. typ. max. unit v in =6.0v,i out =10ma 3.900 4.000 4.100 v v in =6.0v 65 100 ma v in =6.0v 1ma i out 70ma 40 80 mv i out =50ma 0.5 0.7 v v in =6.0v 1.2 3.6 ? i out =10ma v out +1.0v v in 10v 0.1 %/v 10 v 240 ma i out =10ma ?00 ppm/?c 40 ?c topt 85 ?c symbol item v out output voltage i out output current ? v out load regulation ? i out v dif dropout voltage i ss quiescent current ? v out ? v in line regulation v in input voltage ilim current limit ? v out output voltage ? topt temperature coefficient conditions min. typ. max. unit v in =7.0v,i out =10ma 4.875 5.000 5.125 v v in =7.0v 80 120 ma v in =7.0v 1ma i out 80ma 40 80 mv i out =60ma 0.5 0.7 v v in =7.0v 1.3 3.9 ? i out =10ma v out +1.0v v in 10v 0.1 %/v 10 v 240 ma i out =10ma ?00 ppm/?c ?0?c topt 85?c
rx5re 7 ? rx5re60a topt=25?c symbol item v out output voltage i out output current ? v out load regulation ? i out v dif dropout voltage i ss quiescent current ? v out ? v in line regulation v in input voltage ilim current limit ? v out output voltage ? topt temperature coefficient conditions min. typ. max. unit v in =8.0v,i out =10ma 5.850 6.000 6.150 v v in =8.0v 80 120 ma v in =8.0v 1ma i out 80ma 40 80 mv i out =60ma 0.5 0.7 v v in =8.0v 1.4 4.2 ? i out =10ma v out +1.0v v in 10v 0.1 %/v 10 v 240 ma i out =10ma ?00 ppm/?c ?0?c topt 85?c
8 rx5re electrical characteristics by output voltage v in v out =2.0v 1ma 40 60 i out 50ma v in v out =2.0v 1ma i out 60ma 50 80 v in v out =2.0v 40 80 1ma i out 70ma 65 100 v in v out =2.0v 1ma 80 120 i out 80ma rx5re20a 1.950 2.000 2.050 rx5re21a 2.048 2.100 2.152 rx5re22a 2.145 2.200 2.255 rx5re23a 2.243 2.300 2.357 rx5re24a 2.340 2.400 2.460 rx5re25a 2.438 2.500 2.562 rx5re26a 2.535 2.600 2.665 rx5re27a 2.633 2.700 2.767 rx5re28a 2.730 2.800 2.870 rx5re29a 2.828 2.900 2.972 rx5re30a 2.925 3.000 3.075 rx5re31a 3.023 3.100 3.177 rx5re32a 3.120 3.200 3.280 rx5re33a 3.218 3.300 3.382 rx5re34a 3.315 3.400 3.485 rx5re35a 3.413 3.500 3.587 rx5re36a 3.510 3.600 3.690 rx5re37a 3.608 3.700 3.792 rx5re38a 3.705 3.800 3.895 rx5re39a 3.803 3.900 3.997 rx5re40a 3.900 4.000 4.100 rx5re41a 3.998 4.100 4.202 rx5re42a 4.095 4.200 4.305 rx5re43a 4.193 4.300 4.407 rx5re44a 4.290 4.400 4.510 rx5re45a 4.388 4.500 4.612 rx5re46a 4.485 4.600 4.715 rx5re47a 4.583 4.700 4.817 rx5re48a 4.680 4.800 4.920 rx5re49a 4.778 4.900 5.022 rx5re50a 4.875 5.000 5.125 rx5re51a 4.973 5.100 5.227 rx5re52a 5.070 5.200 5.330 rx5re53a 5.168 5.300 5.432 rx5re54a 5.265 5.400 5.535 rx5re55a 5.363 5.500 5.637 rx5re56a 5.460 5.600 5.740 rx5re57a 5.558 5.700 5.842 rx5re58a 5.655 5.800 5.945 rx5re59a 5.753 5.900 6.047 rx5re60a 5.850 6.000 6.150 output voltage outputcurrent load regulation part number v out (v) i out (ma) ? v out / ? i out (mv) conditions min. typ. max. conditions min. typ. conditions typ. max. v in v out =2.0v i out =10ma v in v out =2.0v i out =30ma i out =40ma 0.5 0.7 i out = 50ma i out =60ma dropout voltage v dif (v) conditions typ. max.
rx5re 9 topt=25 ? c 1.0 3.0 1.1 3.3 i out =10ma i out v in =10ma v out 1.2 3.6 0.1 10 240 ?00 =2.0v v out + ?0?c 1.0v topt v in 85?c 10v 1.3 3.9 1.4 4.2 quiescent current line regulation input voltage current limit output voltage tempco. iss(?) ? v out / ? v in (%/v) v in (v) ilim(ma) ? v out / ? t(ppm/?c) conditions typ. max. conditions typ. max. typ. conditions typ.
10 rx5re operation output voltage v out divided at the node between regis- ters r1 and r2 is compared with reference voltage by error amplifier, so that a constant voltage is output. test circuits fig. 2 test circuit fig. 3 quiescent current test circuit fig. 4 line transient response test circuit fig. 1 brock diagram gnd gnd v in + error amplifire v out r2 r1 vref c i 1 f co 1 f v in gnd rx5re series v out i out v out v in + + i ss c i 1 f v in gnd rx5re series v out v in + ro co 0.1 f p.g gnd rx5re series v out v out v in +
rx5re 11 typical characteristics 1) output voltage vs. output current rx5re40a rx5re50a rx5re50a output current i out (ma) output voltage v out (v) 0 3.7 3.8 3.9 4.1 4.0 v in =6.0v 50 100 150 200 topt= 40 ? c 85 ? c 25 ? c 4.7 4.8 4.9 5.1 5.0 v in =7.0v 0 50 100 150 200 250 output voltage v out (v) output current i out (ma) with heatsink without heatsink 4.7 4.8 4.9 5.1 5.0 v in =7.0v 0 50 100 150 200 250 heatsink 30 30 1mm output voltage v out (v) output current i out (ma) 4.7 4.8 4.9 5.1 5.0 v in =7.0v 0 50 100 150 200 250 300 350 25 ? c topt= 40 ? c 85 ? c rx5re30a output voltage v out (v) output current i out (ma) 2.7 2.8 2.9 3.1 3.0 v in =5.0v 0 50 100 150 200 250 topt= 40 ? c 25 ? c 85 ? c rx5re20a rx5re20a 2) output voltage vs. input voltage i out =1a topt=25 ? c 1.0 3.0 4.0 2.0 5.0 input voltage v in (v) 1ma 10ma output voltage v out (v) 1.0 1.2 0.8 1.4 1.6 1.8 2.0 2.2 2.4 topt=25 ? c 245 367 input voltage v in (v) output voltage v out (v) 1.98 1.96 2.00 2.02 2.04 i out =1a 1ma 10ma
12 rx5re rx5re30a rx5re40a rx5re30a rx5re40a rx5re50a rx5re50a topt=25 ? c 2.0 3.0 3.5 2.5 4.0 4.5 input voltage v in (v) output voltage v out (v) 2.0 2.2 1.8 2.4 2.6 2.8 3.0 3.2 3.4 i out =1ma 50ma 10ma 2.5 4.5 3.5 5.5 input voltage v in (v) topt=25 ? c output voltage v out (v) 3.4 3.2 3.6 3.8 4.0 4.2 i out =1ma 50ma 10ma topt=25 ? c 3.0 5.0 6.0 4.0 7.0 8.0 input voltage v in (v) output voltage v out (v) 2.96 2.95 2.97 2.98 2.99 3.00 i out =1a 1ma 10ma topt=25 ? c 467 589 input voltage v in (v) output voltage v out (v) 3.98 3.96 4.00 4.02 4.04 4.06 1ma i out =1a 10ma topt=25 ? c 4.5 4.0 5.5 6.0 5.0 6.5 input voltage v in (v) output voltage v out (v) 4.4 4.2 4.6 4.8 5.0 5.1 i out =1ma 50ma 10ma topt=25 ? c 6 589 710 input voltage v in (v) output voltage v out (v) 4.97 4.98 4.95 4.96 4.99 5.00 5.01 5.02 5.03 5.04 5.05 10ma i out =1a 1ma
rx5re 13 rx5re30a rx5re40a rx5re50a 3) dropout voltage vs. output curret output current i out (ma) dropout voltage v dif (v) 0 20 40 60 80 100 topt= 40 ? c 25 ? c 85 ? c 0.0 0.4 0.6 0.2 0.8 1.0 1.2 1.4 output current i out (ma) dropout voltage v dif (v) 0 20 40 60 80 100 85 ? c 25 ? c topt= 40 ? c 0.0 0.4 0.5 0.7 0.6 0.2 0.3 0.1 0.8 output current i out (ma) dropout voltage v dif (v) 0 20 40 60 80 100 0.0 0.2 0.4 0.6 0.8 1.0 25 ? c topt= 40 ? c 85 ? c rx5re30a 4) output voltage vs.temperature temperature topt( ? c) output voltage v out (v) -50-30-101030507090 2.9 3.0 3.1 i out =10ma rx5re40a temperature topt( ? c) output voltage v out (v) 3.9 4.0 4.1 -50-30-101030507090 i out =10ma
14 rx5re rx5re50a rx5re20a 5) quiescent current vs. input voltage rx5re40a rx5re50a temperature topt( ? c) output voltage v out (v) 4.9 4.8 5.0 5.2 5.1 -50-30-101030507090 i out =10ma input voltage v in (v) 0.6 345678 910 0.7 0.8 0.9 1.0 1.1 quiescent current iss(a) topt=25 ? c rx5re30a input voltage v in (v) 1.0 24 3 5678910 1.1 1.2 1.3 1.4 quiescent current iss(a) topt=25 ? c input voltage v in (v) 1.0 46 5 7 8 9 10 11 1.1 1.2 1.3 1.4 1.5 quiescent current iss(a) topt=25 ? c input voltage v in (v) 0.5 0.6 7 6 589101112 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.5 1.4 quiescent current iss(a) topt=25 ? c
rx5re 15 rx5re20a rx5re40a 6) quiescent current vs. temperature quiescent current iss( a) temperature topt( ? c) 0.5 0.6 0.7 0.8 0.9 1.0 1.5 1.1 1.2 1.3 1.4 50 30 10 10 30 50 70 90 quiescent current iss( a) temperature topt( ? c) 0.5 0.6 0.7 0.8 0.9 1.0 1.5 1.1 1.2 1.3 1.4 50 30 10 10 30 50 70 90 rx5re30a quiescent current iss( a) temperature topt( ? c) 0.5 0.6 0.7 0.8 0.9 1.0 1.5 1.1 1.2 1.3 1.4 50 30 10 10 30 50 70 90 7) dropout voltage vs. set output voltage rx5re series 012 34 56 0.0 0.2 0.1 0.3 0.4 0.5 0.6 0.7 set output voltage vreg(v) dropout voltage v dif (v) 1ma topt=25 ? c 10ma i out =50ma
16 rx5re 8) line transient response (1) rx5re30a rx5re40a rx5re20a rx5re50a 9) line transient response (2) rx5re20a rx5re30a 1.5 2.0 2.5 3.0 3.5 4.0 4.5 1.0 2.0 1.5 2.5 3.0 4.5 4.5 3.5 5.0 input voltage/output voltage v(v) i out =1ma time t(ms) input voltage output voltage 1.5 2.0 2.5 3.0 3.5 4.0 4.5 2.0 4.0 3.0 5.0 7.0 6.0 8.0 input voltage/output voltage v(v) i out =1ma time t(ms) input voltage output voltage 1.5 2.0 2.5 3.0 3.5 4.0 4.5 1.0 3.0 2.0 4.0 6.0 5.0 7.0 input voltage/output voltage v(v) i out =1ma time t(ms) input voltage output voltage 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 output voltage 3.0 5.0 4.0 6.0 8.0 7.0 9.0 input voltage/output voltage v(v) i out =1ma time t(ms) input voltage 1.5 2.0 2.5 3.0 3.5 4.0 4.5 0.0 1.0 1.5 0.5 2.0 2.5 4.0 4.5 3.5 3.0 5.0 input voltage/output voltage v(v) i out =30ma time t(ms) input voltage output voltage 1.5 2.0 2.5 3.0 3.5 4.0 4.5 1.0 3.0 2.0 4.0 6.0 5.0 7.0 input voltage/output voltage v(v) i out =30ma time t(ms) input voltage output voltage
rx5re 17 rx5re40a rx5re50a 1.5 2.0 2.5 3.0 3.5 4.0 4.5 2.0 4.0 3.0 5.0 7.0 6.0 8.0 input voltage/output voltage v(v) i out =30ma time t(ms) input voltage output voltage i out =30ma 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 output voltage 3.0 5.0 4.0 6.0 8.0 7.0 9.0 input voltage/output voltage v(v) time t(ms) input voltage
18 rx5re typical application in rx5re series, a constant voltage can be obtained without using capacitors c1 and c2. however, when the wire connected to v in is long, use capacitor c1. output noise can be reduced by using capacitor c2. insert capacitors c1 and c2 with the capacitance of 0.1? to 2.0? between input/output pins and gnd pin with minimum wiring. the output voltage can be obtained by the follow- ing formula : v out =vreg ?(1+r2/r1) + i ss ?r2 since the quiescent current of rx5re series is so small that the resistances of r1 and r2 can be set as large as several hundreds k ? and therefore the sup- ply current of ?oltage boost circuit?itself can be reduced. furthermore, since rx5re series are operated by a constant voltage, the supply current of ?oltage boost circuit?is not substantially affected by the input voltage. as shown in the circuit diagram, a dual power sup- ply circuit can be constructed by using two rx5re series. this circuit diagram shows a dual power supply circuit with an output of 3v and an output of 5v. when the minimum output current of ic2 is larger than i ss of ic1, resistor r is unnecessary. diode d is a protection diode for the case where v out 2 becomes larger than v out 1. ?voltage boost circuit ?dual power supply circuit c2 c1 v in gnd gnd gnd rx5re series v out v out v in + + c2 c1 v in gnd gnd rx5re series v out v out v in r1 r2 i ss + + c1 c2 v in gnd gnd gnd rx5re20a rx5re30a v out v out 1 5v v out 2 3v v in c3 gnd v out v in r i ss ic1 ic2 d + + + * 1) vreg : set output voltage of rx5re series. * 1 application circuits
rx5re 19 ?current boost circuit output current of 120ma or more can be obtained by the current boost circuit constructed as shown in this circuit diagram. ?current boost circuit with overcurrent limit circuit ?current source a current source with the structure as shown in this circuit diagram can be used. output current i out is obtained as follows : i out =vreg /r + i ss take care that output current i out does not exceed its allowable current. c2 gnd gnd gnd rx5re series v out v out c1 v in v in tr.1 + + c2 gnd gnd gnd rx5re series v out v out v in v in tr.1 tr.2 r1 r2 i out vbe2 + + gnd rx5re series c1 v in v in r i out i ss v out + a circuit for protecting tr.1 from the destruction caused by output short-circuit or overcurrent is shown in this circuit diagram. when the voltage reduction caused by the current ( aa i out ) which flows through r2 reaches vbe2 of tr.2 by additionally providing the current boost circuit with tr.2 and r2, tr.2 is turned on and the base current of tr.1 is increased, so that the output current is limited. current limit of overcurrent limit circuit is obtained as follows : i out vbe2/r2 * 1) vreg : set output voltage of rx5re series. * 1

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