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gc3-h028a page 1 application manual ldo regulator with base terminal for current boost tk714xxs contents 1 . description 2 2 . features 2 3 . applications 2 4 . pin configuration 2 5 . block diagram 2 6 . ordering information 3 7 . absolute maximum ratings 4 8 . electrical characteristics 4 9 . test circuit 5 10 . typical characteristics 7 11 . pin description 15 12 . applications information 15 13 .outline : pcb : stamps 19 14 . notes 20 15. offices 20 meeting your needs
tk714xxs gc3-h028a page 2 ldo regulator with base terminal for current boost tk714xxs 1. description the tk714xxs is a low dropout linear regulator with internal pnp pass transistor that can supply 100ma load current. the phase compensation in the ic has been optimized that the output capacitor can be omitted. the tk714xxs is provided with the on/off control function and also with the base terminal for the external transistor that 1a low dropout regulator can be easily composed by connecting external transistor (hfe around 100). 2. features ? an external transistor can be used. (base current typ10ma) ? on/off control available (high on). ? no input current at off mode ? excellent output stability (cl ? 0.022 f,iout ? 2ma) ? high ripple rejection (-70db at 1khz) ? 100ma load current guarantee ? output voltage available from 1.3 to 5.0v (0.1v step). 3. applications ? electronic equipment ? b attery powered systems mobile communications, etc. 4. pin configuration 1 2 34 5 vin vcont vout base gnd ? 5. block diagram over current limit sw control circuit over heat protection bandgap reference error amp 4 4 4 4 5 5 5 5 3 3 3 3 2 2 2 2 1 1 1 1 vin gnd vcont base vout
tk714xxs gc3-h028a page 3 6. ordering information tk714 l s voltage code ex 33 : 3.3v 50 : 5.0v package code s : sot23-5 tape/reel code operating temp range c : -30~80 ? i : -40~85 ? ordering information standard voltage (net multiplication bold-faced type) tk71413s tk71414s tk71415s tk71416s tk71417s tk71418s tk71419s tk71420s tk71421s tk71422s tk71423s tk71424s tk71425s tk71426s tk71427s tk71428s tk71429s tk71430s tk71431s tk71432s tk71433s tk71434s tk71435s tk71436s tk71437s tk71438s tk71439s tk71440s tk71441s tk71442s tk71443s tk71444s tk71445s tk71446s tk71447s tk71448s tk71449s tk71450s *please contact your authorized toko representatives for voltage availability.
tk714xxs gc3-h028a page 4 7. absolute maximum ratings ta=25 c parameter symbol rating units conditions absolute maximum ratings supply voltage vcc max -0.4 ~ 16 v reverse bias vrev max -0.4 ~ 6 v control pin voltage vcont max -0.4 ~ 16 v base drive pin voltage vbase max -0.4 ~ 16 v storage temperature range t stg -55 ~ 150 c power dissipation p d 500 when mounted on pcb mw * internal limited tj=150c operating condition operating temperature range t op -30 ~ 80 c operating voltage range v op 1.8 ~ 14 v short circuit current ishort 200 ma 8. electrical characteristics unless otherwise specified vin=vouttyp+1.0v ,vcont=1.8v ta=25 c value parameter symbol min typ max units conditions output voltage vout ? 2% or ? 60mv *1 v iout=5ma line regulation linreg 1.0 5.0 mv ? vin=5v 0.7 3.0 %vout iout=5 ~ 100ma (vout=1.5~2.0v) load regulation loareg 0.6 2.5 %vout iout=5 ~ 100ma (vout=2.1~5.0v) 105 180 mv iout=50ma *2 dropout voltage vdrop 180 280 mv iout=100ma *2 maximum output current ioutmax 120 150 ma vout 10% drop supply current icc 50 80 a vout on state iout=0ma standby current istandby 0 0.1 a vout off state vin=10v base drive current ibase 7 10 ma *3 control terminal control current icont 0.9 3.0 a vcont=1.8v output on state 1.8 v vout on state control voltage vcont 0.8 v vout off state *1 refer to table 1. *2 for vout ? 2.0v, no regulations. *3 make sure that this terminal is not connected to gnd otherwise the ic may damaged with excessive current due to circuit structure. i rank (-40~85 ? ) is separately provided.
tk714xxs gc3-h028a page 5 output voltage standard table ( ? 2% or ? 60mv) table 1 vout typ (v) vout min (v) vout max (v) vin (v) vout typ (v) vout min (v) vout max (v) vin (v) 1.3 1.240 1.360 2.3 3.2 3.136 3.264 4.2 1.4 1.340 1.460 2.4 3.3 3.234 3.366 4.3 1.5 1.440 1.560 2.5 3.4 3.232 3.468 4.4 1.6 1.540 1.660 2.6 3.5 3.430 3.570 4.5 1.7 1.640 1.760 2.7 3.6 3.528 3.672 4.6 1.8 1.740 1.860 2.8 3.7 3.626 3.774 4.7 1.9 1.840 1.960 2.9 3.8 3.724 3.876 4.8 2.0 1.940 2.060 3.0 3.9 3.822 3.978 4.9 2.1 2.040 2.160 3.1 4.0 3.920 4.080 5.0 2.2 2.140 2.260 3.2 4.1 4.018 4.182 5.1 2.3 2.240 2.360 3.3 4.2 4.116 4.284 5.2 2.4 2.340 2.460 3.4 4.3 4.214 4.386 5.3 2.5 2.440 2.560 3.5 4.4 4.312 4.488 5.4 2.6 2.540 2.660 3.6 4.5 4.410 4.590 5.5 2.7 2.640 2.760 3.7 4.6 4.508 4.692 5.6 2.8 2.740 2.860 3.8 4.7 4.606 4.794 5.7 2.9 2.840 2.960 3.9 4.8 4.704 4.896 5.8 3.0 2.940 3.060 4.0 4.9 4.802 4.998 5.9 3.1 3.038 3.162 4.1 5.0 4.900 5.100 6.0 9. test circuit standard circuit (iout ? 100ma) applied circuit : when external pnptr is used vin a v a 1 2 34 5 vin gnd vcont vout base cl 0.1 f iout cin 0.1 f iin vout icont vcont vin a v a 1 2 34 5 vin gnd vcont vout base cl iout cin 0.1 f iin vout icont vcont external pnp tr
tk714xxs gc3-h028a page 6 input/output capacitors (cl) linear regulators require input and output capacitors in order to maintain the regulator?s loop stability. the equivalent series resistance(esr) of the output capacitor must be in the stable operation area. however, it is recommended to use as large a value of capacitance as is practical. the output noise and the ripple noise decrease as the capacitance value increases. the ic is never damaged by enlarging the capacitance. esr values vary widely between ceramic and tantalum capacitors, however, tantalum capacitors are assumed to provide more esr damping resistance, which provides greater circuits stability. this implies that a higher level of circuit stability can be obtained by using tantalum capacitors when compared to ceramic capacitors with similar values. the ic provides stable operation with an output side capacitor cl of 0.1 f(iout ? 2ma). if the capacitor is 0.1 f or more over the full range of temperature, either a ceramic capacitor or tantalum capacitor can be used without concerning the esr. a recommended value of the application is as follows. vout ? 1.3v z iout ? 0ma cl ? 0.1 f(tantalum) or cl ? 1.0 f(mlcc) vout ? 1.3v z iout ? 2ma cl ? 0.1 f any type vout ? 3.0v z iout ? 0ma cl ? 0.1 f any type the input capacitor is necessary when the battery is discharged, the power supply impedance increases, or the line distance to the power supply is long. this capacitor might be necessary on each individual ic even if two or more regulator ics are used. it is not possible to determine this indiscriminately. please confirm the stability while mounted. generally, multi layer ceramic capacitor (mlcc) has the temperature characteristic and the voltage characteristic. please select parts in consideration of the voltage and the temperature used. stability area graph (vout=1.3~5.0v) condition vin=vouttyp+1v cin=0.1 f(mlcc) cl=0.022 f(mlcc) 0.01 0.1 1 10 100 0 2040 6080100 iout (ma) esr ( ) s table area unstable area cl=1.0 f(mlcc) 0.01 0.1 1 10 100 0 20406080100 iout (ma) esr ( ) s table area cl=0.1 f(tantalum) 0.01 0.1 1 10 100 0 20406080100 iout (ma) esr ( ) s table area
tk714xxs gc3-h028a page 7 10. typical characteristics 10-1 dc characteristics (tk71430s) unless otherwise specified vin=vouttyp+1v,vcont=1.8v ,cin=0.1 f,cl=0.1 f,ta=25 c ? vin vs iin ? line regulation 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 02 46810 vin ( v) iin (ma) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0246 810 vin ( v) vo ut ( v) ? load regulation ? dropout voltage 2.975 2.980 2.985 2.990 2.995 3.000 3.005 3.010 3.015 3.020 3.025 020406080100 iout (ma) vo ut ( v) -200 -180 -160 -140 -120 -100 -80 -60 -40 -20 0 020406080100 iout (ma) vdrop (mv) ? vin vs vout regulation point ? short circuit current 2.800 2.825 2.850 2.875 2.900 2.925 2.950 2.975 3.000 3.025 3.050 2.80 2.90 3.00 3.10 3.20 3.30 vin ( v) vo ut ( v) iout=0ma 50ma 100ma 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 50 100 150 200 250 300 iout (ma) vo ut ( v)
tk714xxs gc3-h028a page 8 ? reverse bias current ? iin (off state) 0 5 10 15 20 25 30 35 40 45 50 0246810 vre v ( v) irev ( a) 1.e-10 1.e-09 1.e-08 1.e-07 1.e-06 0246810 vin ( v) ist an dby ( a) ? vcont vs icont ? gnd pin current 0.0 2.0 4.0 6.0 8.0 10.0 0.0 1.0 2.0 3.0 4.0 5.0 vco n t ( v) icont (ua) 0.0 2.0 4.0 6.0 8.0 10.0 0 20406080100 iout (ma) ignd (ma) ??
tk714xxs gc3-h028a page 9 temperature characteristic ? quiescent current ? vout 0 10 20 30 40 50 60 70 80 90 100 -40 -20 0 20 40 60 80 100 ta ( ) iq (ua) 2.970 2.975 2.980 2.985 2.990 2.995 3.000 3.005 3.010 3.015 3.020 -40 -20 0 20 40 60 80 100 ta ( ) vo ut ( v) ? dropout voltage ? iout max 0 50 100 150 200 250 300 -40 -20 0 20 40 60 80 100 ta ( ) vdrop (mv) iout=100ma iout=50ma 0 50 100 150 200 250 -40 -20 0 20 40 60 80 100 ta ( ) iout max (ma) ? on/off point ? base drive current 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 -40 -20 0 20 40 60 80 100 ta ( ) vco n t ( v) on point off point 0 2 4 6 8 10 12 14 16 18 20 -40 -20 0 20 40 60 80 100 ta ( ) ibase (ma)
tk714xxs gc3-h028a page 10 10-2 ac characteristics(tk71430s) ripple rejection vin=4.5v vripple=200mvp-p cin=none iout=10ma f=100~1m(hz) log scale ? cl=0.47 f(mlcc) ? cl=1.0 f(mlcc) ? cl=1.0 f(tantalum) ? cl=10 f(tantalum) ? ? measurement circuit chart vin vripple cl vout tk714xxs vin vcont gnd -50db 0db -50db 0db -50db 0db -50db 0db
tk714xxs gc3-h028a page 11 output noise characteristic (tk71430s) ? cl=0.1 f (mlcc) ? cl=0.1 f (tantalum) 0 50 100 150 200 250 300 020406080100 iout (ma) noise density ( vr m s) 0 50 100 150 200 250 300 0 20 40 60 80 100 iout (ma) noise density ( vr m s) ? cl=1.0 f (mlcc) ? cl=1.0 f (tantalum) 0 50 100 150 200 250 300 0 20406080100 iout (ma) noise density ( vr m s) 0 50 100 150 200 250 300 0 20 40 60 80 100 iout (ma) noise density ( vr m s) ? cl=10 f (mlcc) ? cl=10 f (tantalum) 0 50 100 150 200 250 300 0 20406080100 iout (ma) noise density ( vr m s) 0 50 100 150 200 250 300 0 20 40 60 80 100 iout (ma) noise density ( vr m s)
tk714xxs gc3-h028a page 12 on/off transient vin=4.0v iout=5ma cin=0.1 f vcont cl=0 cl=0 cl=0.1 f(mlcc) cl=0.1 f(mlcc) cl=1.0 f(mlcc) cl=2.2 f(mlcc) cl=1.0 f(mlcc) vcont vcont vout vout vcont vout vout
tk714xxs gc3-h028a page 13 line transient vcont=1.8v iout=5ma cin=0.1 f vin=4v vin = 5v vin=5v vin=4v cl=0.1 f(mlcc) cl=0.1 f(mlcc) cl=1.0 f(mlcc) cl=1.0 f(mlcc)
tk714xxs gc3-h028a page 14 load transient vin=4.0v iout=5ma cin=0.1 f the load transient (no load) can be greatly improved by delivering a little load current to ground. increase the load side capacitor when the load change is fast or when there is a large current change. iout=50ma 5ma 5ma iout=50ma 5ma iout=100ma cl=0.1
tk714xxs gc3-h028a page 15 11. pin description pin no. pin description internal equivalent circuit description 1 vin - input terminal 2 gnd - gnd terminal 3 vcont 3 3 3 3 400k on/off control terminal the pull down resistance is not built in. 4 base base terminal for external pnp transistor 5 vout 4 4 4 4 5 5 5 5 100 vin vin vin vin vref r1 r2 output terminal 1 2 1 r r r vref vout + = *make sure that this terminal is not connected to gnd otherwise the ic may damaged with excessive current due to circuit structure. 12. applications information 12-1. definition of term output voltage ? ? ? ? vout e e e e the output voltage is specified with vin=(vouttyp+1v) and iout=5ma. maximum output current ? ? ? ? iout max e e e e the rated output current is specified under the condition where the output voltage drops 0.9v times the value specified with iout=5ma. the input voltage is set to vouttyp+1v and the current is pulsed to minimize temperature effect. dropout voltage(vdrop) the dropout voltage is the difference between the input voltage and the output voltage at which point the regulator starts to fall out of regulation. below this value, the output voltage will fall as the input voltage is reduced. it is dependent upon the load current and the junction temperature. line regulation ? ? ? ? linreg e e e e line regulation is the ability of the regulator to maintain a constant output voltage as the input voltage changes. the line regulation is specified as the input voltage is changed from vin=vouttyp+1v to vin=vouttyp+6v. it is a pulse measurement to minimize temperature effect. load regulation ? ? ? ? loareg e e e e load regulation is the ability of the regulator to maintain a constant output voltage as the load current changes. it is a pulsed measurement to minimize temperature effects with the input voltage set to vin=vouttyp+1v. the load regulation is specified output current step conditions of 5ma to 100ma. ripple rejection ? ? ? ? r.r e e e e ripple rejection is the ability of the regulator to attenuate the ripple content of the input voltage at the output. it is specified with 200 < v rms , 1khz super- imposed on the input voltage, where vin=vout+1.5v. ripple rejection is the ratio of the ripple content of the output vs. input and is expressed in db
tk714xxs gc3-h028a page 16 ? standby current(istandby) standby current is the current which flows into the regulator when the output is turned off by the control function(vcont=0v). it is measured with vin=10v. ? over current sensor the over current sensor protects the device when there is excessive output current. it also protects the device if the output is accidentally connected to ground. (when external transistor is used, the protection operates at 10ma at the base terminal) thermal sensor the thermal sensor protects the device in case the junction temperature exceeds the safe value(t j =150 ? ). this temperature rise can be caused by external heat, excessive power dissipation caused by large input to output voltage drops, or excessive output current. the regulator will shut off when the temperature exceeds the safe value. as the junction temperatures decrease, the regulator will begin to operate again. under sustained fault conditions, the regulator output will oscillate as the device turns off then resets. damage may occur to the device under extreme fault. please reduce the loss of the regulator when this protection operate, by reducing the input voltage or make better heat efficiency. reverse voltage protection y y y y reverse voltage protection prevents damage due to the output voltage being higher than the input voltage. this fault condition can occur when the output capacitor remains charged and the input is reduced to zero, or when an external voltage higher than the input voltage is applied to the output side. the maximum reverse bias voltage is 6v. ? esd y mm:200pf 0 ? 200v or more hbm:100pf 1.5k ? 2000v or more 12-2. external transistor use connection example. the base drive current is typ10ma(ta=25 ? ). please select the suitable external transistor matched to the output current. the built in pnptr does not operate when external transistor is connected. moreover, be careful for the output short-circuit. an external transistor might be damaged. selection of cl please choose cl according to the characteristic of the external transistor. we recommend using twice the value of the capacitor of which the oscillation stops. (when stabilized with 1 f, 2.2 f is recommended) please follow below if you cannot keep the stability of the output. ? add r_base ? add series resistance (rs) to cl, or, change cl to the electrolytic capacitor, etc.(when using mlcc) + r_base rs (rs=1~5 ? ) attention make sure that this terminal is not connected to gnd or the ic may damaged with excessive current due to circuit structure. please refer to next page for the data when using an external transistor.
tk714xxs gc3-h028a page 17 example of characteristic when using external transistor ? load regulation (2sb1301) ? load regulation (2sa1203) 2.975 2.980 2.985 2.990 2.995 3.000 3.005 3.010 3.015 3.020 3.025 0 100 200 300 400 500 iout (ma) vo ut ( v) 2.975 2.980 2.985 2.990 2.995 3.000 3.005 3.010 3.015 3.020 3.025 0 100 200 300 400 500 iout (ma) vo ut ( v) ? dropout voltage (2sb1301) ? dropout voltage (2sa1203) -200 -180 -160 -140 -120 -100 -80 -60 -40 -20 0 0 100 200 300 400 500 iout (ma) vdrop (mv) -200 -180 -160 -140 -120 -100 -80 -60 -40 -20 0 0 100 200 300 400 500 iout (ma) vdrop (mv)
tk714xxs gc3-h028a page 18 12-3. layout board layout without external transistor gnd gnd gnd gnd vcont vcont vcont vcont base base base base vin vin vin vin vout vout vout vout pcb material:glass epoxy (t=0.8mm) 0 25 50 85 100 150 pd(mw) 500 ta ( ) -4.0mw/ g please do derating with 4mw/ ? at pd=500mw and 25 ? or more. thermal resistance is ( ja=250 ? /w) the package loss is limited at the temperature that the internal temperature sensor works (about 150 c). therefore, the package loss is assumed to be an internal limitation. there is no heat radiation characteristic of the package unit assumed because of the small size. heat is carried away by the device being mounted on the pcb. this value changes by the material and the copper pattern etc. of the pcb. the losses are approximately 500mw. enduring these losses becomes possible in a lot of applications operating at 25 c. the overheating protection circuit operates when there are a lot of losses with the regulator (when outside temperature is high or heat radiation is bad). the output current cannot be pulled enough and the output voltage will drop when the protection circuit operates. when the junction temperature reaches 150 ? , the ic is shut down. however, operation begins at once when the ic stops operation and the temperature of the chip decreases. how to determine the thermal resistance when mounted on pcb the thermal resistance when mounted is expressed as follows: tj= ja pd+ta. tj of ic is set around 150 ? . pd is the value when the thermal sensor is activated. if the ambient temperature is 25 ? , then: 150= ja pd+25 ja pd=125 ja=125/pd ( ? /mw) pd is easily calculated. a simple way to determine pd is to calculate vin x iin when the output side is shorted. input current gradually falls as temperature rises. you should use the value when thermal equilibrium is reached. in many cases, heat radiation is good, and pd has 500mw or more. 0 25 50 75 100 150 pd(mw) pd d pd 2 3 5 4 ta ( ) procedure (when mounted on pcb). 1.find pd (vin iin when the output side is short-circuited). 2. plot pd against 25 ? . 3. connect pd to the point corresponding to the 150 ? with a straight line. 4. in design, take a vertical line from the maximum operating temperature(e.g., 75 ? ) to the derating curve. 5. read off the value of pd against the point at which the vertical line intersects the derating curve. this is taken as the maximum power dissipation dpd. 6.dpd ? (vinmax-vout)=iout (at 75 ? ) the maximum output current at the highest operating temperature will be iout dpd ? ? ? ? (vinmax-vout). please use the device at low temperature with better radiation. the lower temperature provides better quality. package only
tk714xxs gc3-h028a page 19 13.outline : pcb : stamps ? ? ? ? ? ? ??y ??? ?? ?? ?? ?? recommended mount pad ?? ?t ??e ???? ?? ???4(? ?? ?? @7,?
6+, ?? ?? ? ? ?? ?? , , " ?? , , , ? ???? ?? ?? ? ? 63;(.,?
6+, unit : mm molded resin with body : epoxy resin general tolerance : ? 0.2 traetment : solder plating (5 ? 15 m) country of origin : japan lead frame : copper alloy marking method : laser weight : 0.016g vout (v) voltage code vout (v) voltage code vout (v) voltage code vout (v) voltage code 1.5 15 2.4 24 3.3 33 4.2 42 1.6 16 2.5 25 3.4 34 4.3 43 1.7 17 2.6 26 3.5 35 4.4 44 1.8 18 2.7 27 3.6 36 4.5 45 1.9 19 2.8 28 3.7 37 4.6 46 2.0 20 2.9 29 3.8 38 4.7 47 2.1 21 3.0 30 3.9 39 4.8 48 2.2 22 3.1 31 4.0 40 4.9 49 2.3 23 3.2 32 4.1 41 5.0 50
tk714xxs gc3-h028a page 20 14. notes ? please be sure that you carefully discuss your planned purchase with our office if you intend to use the products in this application manual under conditions where particularly extreme standards of reliability are required, or if you intend to use products for applications other than those listed in this application manual. z power drive products for automobile, ship or aircraft transport systems; steering and navigation systems, emergency signal communications systems, and any system other than those mentioned above which include electronic sensors, measuring, or display devices, and which could cause major damage to life, limb or property if misused or failure to function. z medical devices for measuring blood pressure, pulse, etc., treatment units such as coronary pacemakers and heat treatment units, and devices such as artificial organs and artificial limb systems which augment physiological functions. z electrical instruments, equipment or systems used in disaster or crime prevention. ? semiconductors, by nature, may fail or malfunction in spite of our devotion to improve product quality and reliability. we urge you to take every possible precaution against physical injuries, fire or other damages which may cause failure of our semiconductor products by taking appropriate measures, including a reasonable safety margin, malfunction preventive practices and fire-proofing when designing your products. ? this application manual is effective from dec 2001. note that the contents are subject to change or discontinuation without notice. when placing orders, please confirm specifications and delivery condition in writing. ? toko is not responsible for any problems nor for any infringement of third party patents or any other intellectual property rights that may arise from the use or method of use of the products listed in this application manual. moreover, this application manual does not signify that toko agrees implicitly or explicitly to license any patent rights or other intellectual property rights which it holds. ? none of ozone depleting substances(ods) under the montreal protocol is used in manufacturing process of us. 15. offices if you need more information on this product and other toko products, please contact us. ? toko inc. headquarters 1-17, higashi-yukigaya 2-chome, ohta-ku, tokyo, 145-8585, japan tel: +81.3.3727.1161 fax: +81.3.3727.1176 or +81.3.3727.1169 web site: http://www.toko.co.jp/ ? toko america web site: http://www.toko.com/ ? toko europe web site: http://www.tokoeurope.com/ ? toko hong kong web site: http://www.toko.com.hk/ ? toko taiwan web site: http://www.tokohc.com.tw/ ? toko singapore web site: http://www.toko.com.sg/ ? toko seoul web site: http://www.toko.co.kr/ ? toko manila web site: http://www.toko.com.ph/ ? toko brazil web site: http://www.toko.com.br/ meeting your needs to build the quality relied by costomers your distributor

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