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gc3-k020b page 1 application manual negative-input negative-output regulator ic tk721xxcs contents 1 . description 2 2 . features 2 3 . applications 2 4 . pin configuration 2 5 . package outline 2 5. ordering information 3 6 . block diagram 4 7 . absolute maximum ratings 4 8 . electrical characteristics 5 9 . test circuit 6 10 . typical characteristics 7 11 . pin description 22 12 . applications information 23 12-2. esr stability 24 12-3. 25 operating region and power dissipation 25 12-4 application hint 27 13 . notes 28 14. offices 28
tk721xxcs gc3-k020b page 2 negative-input negative-output regulator ic tk721xxcs 1. description tk721xxcs series is a negative-input negative-output regulator ic using silicon monolithic bipolar structure which can supply 150ma output current. the output voltage can be set from -2.0 to -9.5v, which is trimmed in high accuracy. tk721xxcs is supplied with on/off terminal and noise reduction terminal. the on/off control can be controlled directly with positive logic or cpu. moreover, tk721xxcs is provided with short-circuit protection and thermal shutdown. 2. features ! high output voltage accuracy(2.0% or 60 mv) ! on/off control available (high off) ! built-in short-circuit protection and thermal shutdown. ! guarantee 150ma output current( 200ma peak) ! ceramic capacitor available for application 3. applications ! battery powered systems ! dsc, ccd bias, gaas bias. 4. pin configuration top view 1 3 2 5 4 vee vout np gnd cont 5. package outline ! sot23-5 2.9 1.6 1.1 0.15 0.4 2.8 2.4 reference mount pad 1.0 0.7 (0.3) 0 ~0.1 0.1 1.3max 0.1 0.2 mark 0.2 0.2 5 4 1 3 +0.10 ? 0.05 +0.10 ? 0.05 0.95 0.95 0.95 0.95 m 0.1
tk721xxcs gc3-k020b page 3 5. ordering information package vout part number marking -2.0 tk72120cs k20 -2.5 tk72125cs k25 -3.0 tk72130cs k30 -3.5 tk72135cs k35 -4.0 tk72140cs k40 -4.5 tk72145cs k45 -5.0 TK72150CS k50 -5.5 tk72155cs k55 -6.0 tk72160cs k60 -6.5 tk72165cs k65 -7.0 tk72170cs k70 -7.5 tk72175cs k75 -8.0 tk72180cs k80 -8.5 tk72185cs k85 -9.0 tk72190cs k90 -9.5 tk72195cs k95 sot23-5 for other voltages, please contact the toko sales office.
tk721xxcs gc3-k020b page 4 6. block diagram bandgap reference over heat & over current protection vee np vout 90k cont gnd control:low level on 7. absolute maximum ratings t a =25 c parameter symbol rating units conditions supply voltage vin -20 v |vin|+|vcont| 20v control pin voltage vcont -0.4 ~ +5 v |vin|+|vcont| 19v power dissipation (sot23-5 simple substance) p d 500 mw p d must be decreased at the rate of 4mw/ c for operation above 25 c. storage temperature range t stg -55 ~ +150 c operating temperature range t op -40 ~ 85 c operating voltage range v op -19 v |vin|+|vcont| 19v output short-circuit current ishort 300 ma over current protection absolute maximum ratings are limits beyond which damage to the device may occur. when the operation exceeds this standard, quality can not be guaranteed.
tk721xxcs gc3-k020b page 5 8. electrical characteristics vin=vout typ -1.5v, ta=25 c value parameter symbol min typ max unit condition vout vout refer to table 1 v iout=5ma line regulation linreg 1 5 mv ? vin=5v refer to table 1 mv iout=5ma~50ma refer to table 1 mv iout=5ma~100ma load regulation loareg refer to table 1 mv iout=5ma~150ma 0.29 0.50 v iout=50ma 0.48 0.80 v iout=100ma dropout voltage *1 vdrop 0.66 1.10 v iout=150ma supply current icc 155 250 a iout=0ma standby current istandby 20 60 a vout off state peak output current iout peak 200 280 ma when vout drops 10% control current icont 12 30 a vcont=+1.8v 0 0.3 v vout on state control voltage vcont 1.5 v vout off state *1 for vout -3.0 no regulations table 1 loareg vout iout=50ma iout=100ma iout=150ma part number min typ max typ max typ max typ max tk72120cs -2.060 -2.000 -1.940 9 24 15 39 24 60 tk72125cs -2.560 -2.500 -2.440 9 24 15 39 24 60 tk72130cs -3.060 -3.000 -2.940 9 24 15 39 24 60 tk72135cs -3.570 -3.500 -3.430 11 28 18 46 28 70 tk72140cs -4.080 -4.000 -3.920 12 30 20 52 32 80 tk72145cs -4.590 -4.500 -4.410 14 34 23 59 36 90 TK72150CS -5.100 -5.000 -4.900 15 38 25 65 40 100 tk72155cs -5.610 -5.500 -5.390 17 41 28 72 44 110 tk72160cs -6.120 -6.000 -5.880 18 45 30 78 48 120 tk72165cs -6.630 -6.500 -6.370 20 49 33 85 52 130 tk72170cs -7.140 -7.000 -6.860 21 53 35 91 56 140 tk72175cs -7.650 -7.500 -7.350 23 56 38 98 60 150 tk72180cs -8.160 -8.000 -7.840 24 60 40 104 64 160 tk72185cs -8.670 -8.500 -8.330 26 64 43 111 68 170 tk72190cs -9.180 -9.000 -8.820 27 68 45 117 72 180 tk72195cs -9.690 -9.500 -9.310 29 71 48 124 76 190
tk721xxcs gc3-k020b page 6 9. test circuit ! dc ! load transient icont vcont 0.01 1 vin cin vout cout cnp 1 3 2 5 4 vee vout np gnd cont iout v a 1 a iin vin cin vout cout cnp 1 3 2 5 4 vee vout np gnd cont iout v ! line transient ! on/off transient cin vout cout cnp 1 3 2 5 4 vee vout np gnd cont iout v vin=vouttyp-2.5v vin=vouttyp-1.5v vin vin cin vout cout cnp vcont=0 1.5 0 1 3 2 5 4 vee vout np gnd cont iout v ! ripple rejection ! esr stability view point cout cnp 1 3 2 5 4 vee vout np gnd cont iout vripple=500mvp-p vin=vouttyp-2.0v vin cin vout cout cnp 1 3 2 5 4 vee vout np gnd cont iout v esr
tk721xxcs gc3-k020b page 7 10. typical characteristics 10-1 dc characteristics unless otherwise specified vin=vout typ -1.5v,vcont=0v,cin=1.0uf(mlcc),cout=1.0uf(mlcc),cnp=0.01uf ta=25 c icont vcont 0.01 1 vin cin vout cout cnp 1 3 2 5 4 vee vout np gnd cont iout v a 1 a iin ! line regulation ! load regulation 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 0 5 10 15 20 vin (-v) vout (-v) 0 10 20 30 40 50 60 70 80 90 100 050100150 iout (ma) vout (mv) ! iout peak ! iq 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 0 100 200 300 400 iout (ma) vout (-v) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 100 200 300 400 iout (ma) iq (ma) vout=-8.5v vout=-5.0v vout=-2.5v vout=-8.5/-5.0/-2.5v vout=-8.5v vout=-5.0v vout=-2.5v
tk721xxcs gc3-k020b page 8 unless otherwise specified vin=vout typ -1.5v,vcont=0v,cin=1.0uf(mlcc),cout=1.0uf(mlcc),cnp=0.01uf ta=25 c ! iin (iout=0ma) ! dropout voltage 0 200 400 600 800 1000 1200 1400 1600 1800 2000 0 5 10 15 20 vin (-v) iin (ua) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 050100150 iout (ma) vdrop (v) ! vout vs vcont ! vout vs vin 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 0.0 0.5 1.0 1.5 2.0 vcont (v) vout (-v) -0.5 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 -0.5 0 0.5 1 vin (-v) vout (-v) ! icont vs vcont (iout=1ma) ! icc off mode (vcont=1.5v,iout=0ma) -50 -40 -30 -20 -10 0 10 20 30 40 50 -1.0 0.0 1.0 2.0 3.0 4.0 5.0 vcont (v) icont (ua) 0 10 20 30 40 50 60 70 80 90 100 0 5 10 15 20 vin (-v) iin (ua) vout=-8.5v vout=-5.0v vout=-2.5v vout=-8.5v vout=-5.0v vout=-2.5v iout=0/30/60/90/120/150ma
tk721xxcs gc3-k020b page 9 10-2 temperature characteristic unless otherwise specified vin=-vout typ -1.5v,vcont=0v,cin=1.0uf(mlcc),cout=1.0uf(mlcc),cnp=0.01uf icont vcont 0.01 1 vin cin vout cout cnp 1 3 2 5 4 vee vout np gnd cont iout v a 1 a iin ! tk72125cs vout ! tk72185cs vout 2.400 2.420 2.440 2.460 2.480 2.500 -40 -20 0 20 40 60 80 100 ta ( ) vout (-v) 8.450 8.470 8.490 8.510 8.530 8.550 -40 -20 0 20 40 60 80 100 ta ( ) vout (-v) ! tk72125cs iout peak ! tk72185cs iout peak 250 260 270 280 290 300 310 320 330 340 350 -40 -20 0 20 40 60 80 100 ta ( ) iout_max 250 260 270 280 290 300 310 320 330 340 350 -40 -20 0 20 40 60 80 100 ta ( ) iout_max
tk721xxcs gc3-k020b page 10 unless otherwise specified vin=-vout typ -1.5v,vcont=0v,cin=1.0uf(mlcc),cout=1.0uf(mlcc),cnp=0.01uf ! tk72125cs loadreg ! tk72185cs loadreg 0 20 40 60 80 100 120 140 160 -40 -20 0 20 40 60 80 100 ta ( ) loadreg (mv) 0 20 40 60 80 100 120 140 160 -40 -20 0 20 40 60 80 100 ta ( ) loadreg (mv) ! tk72125cs on/off ! tk72185cs on/off 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 -40 -20 0 20 40 60 80 100 ta ( ) vcont (v) 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 -40 -20 0 20 40 60 80 100 ta ( ) vcont (v) ! tk72125cs iin(iout=0ma) ! tk72185cs iin(iout=0ma) 100 110 120 130 140 150 160 170 180 190 200 -40 -20 0 20 40 60 80 100 ta ( ) icc (ua) 100 110 120 130 140 150 160 170 180 190 200 -40 -20 0 20 40 60 80 100 ta ( ) icc (ua) io=5-150ma io=5-100ma io=5-150ma io=5-100ma vout off vout off vout on vout on
tk721xxcs gc3-k020b page 11 unless otherwise specified vin=-vout typ -1.5v,vcont=0v,cin=1.0uf(mlcc),cout=1.0uf(mlcc),cnp=0.01uf ! tk72125cs icont ! tk72185cs icont 0 2 4 6 8 10 12 14 16 18 20 -40 -20 0 20 40 60 80 100 ta ( ) icont_1.8v (ua) 0 2 4 6 8 10 12 14 16 18 20 -40 -20 0 20 40 60 80 100 ta ( ) icont_1.8v (ua) ! tk72125cs icc_offmode ! tk72185cs icc_offmode 0 5 10 15 20 25 30 35 40 45 50 -40 -20 0 20 40 60 80 100 ta ( ) icc_offmode (ua) 0 5 10 15 20 25 30 35 40 45 50 -40 -20 0 20 40 60 80 100 ta ( ) icc_offmode (ua) ! tk72125cs vdrop ! tk72185cs vdrop for vout -2.0v, no regulations 0 100 200 300 400 500 600 700 800 900 -40 -20 0 20 40 60 80 100 ta ( ) vdrop (mv) io=50/100/150ma
tk721xxcs gc3-k020b page 12 10-3 load transient unless otherwise specified vin=vout typ -1.5v,cin=1.0uf(mlcc),cnp=0.01uf vin cin vout cout cnp 1 3 2 5 4 vee vout np gnd cont iout v ! tk72125cs vout:200mv/div time:200usec/div ! tk72185cs vout:200mv/div time:200usec/div ! tk72125cs vout:200mv/div time:200usec/div ! tk72185cs vout:200mv/div time:200usec/div vout iout iout vout cout=2.2uf(tantalum) cout=1.0uf(tantalum) cout=1.0uf(tantalum) cout=2.2uf(tantalum) 5ma 100ma 100ma 5ma iout vout iout 5ma 100ma cout=1.0uf(mlcc) cout=2.2uf(mlcc) cout=1.0uf(mlcc) cout=2.2uf(mlcc) 5ma 100ma vout
tk721xxcs gc3-k020b page 13 unless otherwise specified vin=vout typ -1.5v,cin=1.0uf(mlcc),cnp=0.01uf ! tk72125cs vout:1v/div time:10usec/div ! tk72185cs vout:2v/div time:10usec/div ! tk72125cs vout:500mv/div time:4msec/div ! tk72185cs vout:500mv/div time:4msec/div vout iout 0ma 100ma cout=1.0uf(mlcc) cout=2.2uf(mlcc) vout iout 0ma 100ma cout=1.0uf(mlcc) cout=2.2uf(mlcc) vout iout iout vout 0ma 100ma 100ma 0ma cout=0.1uf(mlcc) cout=1.0uf(mlcc) cout=2.2uf(mlcc) cout=0.1uf(mlcc) cout=1.0uf(mlcc) cout=2.2uf(mlcc)
tk721xxcs gc3-k020b page 14 unless otherwise specified vin=vout typ -1.5v,cin=1.0uf(mlcc),cnp=0.01uf ! tk72125cs vout:500mv/div time:10usec/div ! tk72185cs vout:500mv/div time:10usec/div ! tk72125cs vout:100mv/div time:4msec/div ! tk72185cs vout:100mv/div time:4msec/div cout=1.0uf(tantalum) cout=2.2uf(tantalum) vout iout 0ma 100ma vout iout 100ma 0ma cout=1.0uf(tantalum) cout=2.2uf(tantalum) cout=1.0uf(tantalum) cout=2.2uf(tantalum) vout iout 100ma 0ma vout iout 0ma 100ma cout=1.0uf(tantalum) cout=2.2uf(tantalum)
tk721xxcs gc3-k020b page 15 10-4 on/off transient vin=vout typ -1.5v,cin=1.0uf(mlcc),iout=100ma vin cin vout cout cnp vcont=0 1.5 0 1 3 2 5 4 vee vout np gnd cont iout v ! tk72125cs cout=1.0uf(mlcc) vout:1v/div vcont:2v/div time:400usec/div ! tk72185cs cout=1.0uf(mlcc) vout:2v/div vcont:2v/div time:200usec/div ! tk72125cs cout=1.0uf(mlcc) vout:1v/div vcont:2v/div time:4msec/div ! tk72185cs cout=1.0uf(mlcc) vout:2v/div vcont:2v/div time:2msec/div vcont vcont 0v 0v vout vout vout vcont vout vcont 0v 0v cn p =102 cn p =103 cn p =102 cn p =103 cn p =473 cn p =104 cn p =473 cn p =104 f=1hz(cnp full discharge) f=1hz(cnp full discharge) f=1hz(cnp full discharge) f=1hz(cnp full discharge)
tk721xxcs gc3-k020b page 16 vin=-vout typ -1.5v,cin=1.0uf(mlcc),iout=100ma ! tk72125cs vout:1v/div vcont:2v/div time:400usec/div ! tk72185cs vout:2v/div vcont:2v/div time:400usec/div ! tk72125cs control frequency variable vout:1v/div vcont:2v/div time:200usec/div ! tk72185cs control frequency variable vout:2v/div vcont:2v/div time:400usec/div rise-time of the output voltage. changes by cout and cnp. moreover, the rise-time changes by the charge situation of cnp. standing up from the state that the charge came off completely slows most. vout vcont vout vcont 0v 0v cout=1uf/10uf/22uf cout=1uf/10uf/22uf cnp=103 couttype=mlcc cnp=103 couttype=mlcc vout 0v f=100/50/1hz vcont vout vcont 0v f=100/50/1hz cnp=103 cout=1.0uf(mlcc) cnp=103 cout=1.0uf(mlcc) f=1hz(cnp full discharge) f=1hz(cnp full discharge) vout on vout off vout on vout off
tk721xxcs gc3-k020b page 17 vin=-vout typ -1.5v,cin=1.0uf(mlcc),cout=1.0uf(mlcc),cnp=0.01uf,iout=100ma ! tk72125cs vout:2v/div vcont:1v/div time:100usec/div ! tk72185cs vout:2v/div vcont:1 v/div time:400usec/div ! tk72125cs vout:2v/div vcont:1v/div time:100usec/div ! tk72185cs vout:2v/div vcont:1v/div time:1msec/div the turn on time will be largely affected by iout and cout,but not by cnp. vout vcont vout vcont 0v iout=10/50/100ma vout vcont vout vcont cout=1.0/4.7/10uf off on iout=10/50/100ma 0v off on 0v on off cout=1.0/4.7/10uf 0v on off
tk721xxcs gc3-k020b page 18 10-5 line transient vin=-vout typ -1.5 -vout typ -2.5v,cin=1.0uf(mlcc),cnp=0.01uf,iout=100ma cin vout cout cnp 1 3 2 5 4 vee vout np gnd cont iout v vin=vouttyp-2.5v vin=vouttyp-1.5v vin ! tk72125cs vout:100mv/div vin:1v/div time:100usec/div ! tk72185cs vout:100mv/div vin:1v/div time:100usec/div ! tk72125cs vout:100mv/div vin:1v/div time:100usec/div ! tk72185cs vout:100mv/div vin:1v/div time:100usec/div vout vin=vout typ -2.5v vout typ -1.5v vin cout=1.0uf ( mlcc ) cout=2.2uf ( mlcc ) vout vin=vout typ -2.5v vout typ -1.5v vin cout=1.0uf ( mlcc ) cout=2.2uf ( mlcc ) vout vin cout=1.0uf ( tantalum ) cout=2.2uf ( tantalum ) vout vin cout=1.0uf ( tantalum ) cout=2.2uf ( tantalum ) vin=vout typ -2.5v vout typ -1.5v vin=vout typ -2.5v vout typ -1.5v
tk721xxcs gc3-k020b page 19 10-6 noise vin= vout typ -1.5(v) vcont=0v cin=1.0uf(mlcc) bpf400 ~ 80khz iout=100ma ! cout=1.0uf(mlcc) ! cout=1.0uf(tantalum) 0 50 100 150 200 250 300 350 400 450 500 1000 10000 100000 cnp (pf) noise (uvrms ) 0 50 100 150 200 250 300 350 400 450 500 1000 10000 100000 cnp (pf) noise (uvrms ) ! cout=1.0uf(mlcc) cnp=103 ! cout=1.0uf(mlcc) cnp=103 iout=100ma 0 20 40 60 80 100 120 140 160 180 200 050100150 iout (ma) noise (uvrms) 0 20 40 60 80 100 120 140 160 180 200 246810 vout (-v) noise (uvrms) tk72185cs tk72185cs tk72125cs tk72125cs tk72185cs tk72125cs
tk721xxcs gc3-k020b page 20 10-7 ripple rejection vin=vout typ -2.0(v) vripple=500mvp-p,cnp=0.01uf,iout=10ma view point cout cnp 1 3 2 5 4 vee vout np gnd cont iout vripple=500mvp-p vin=vouttyp-2.0v ! tk72125cs cout=1.0uf(mlcc) ! tk72185cs cout=1.0uf(mlcc) ! tk72125cs cout=2.2uf(mlcc) ! tk72185cs cout=2.2uf(mlcc) 10db/div 0db 10db/div 0db 10db/div 0db 10db/div 0db
tk721xxcs gc3-k020b page 21 vin=vout typ -2.0(v) vripple=500mvp-p,cnp=0.01uf,iout=10ma ! tk72125cs cout=1.0uf(tantalum) ! tk72185cs cout=1.0uf(tantalum) ! ! ! ! tk721xxcs f=1khz,vripple=100mvp-p -60 -50 -40 -30 -20 -10 0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 vout-vin (v) r.r (db) io=10ma io=100ma 10db/div 0db 10db/div 0db
tk721xxcs gc3-k020b page 22 11. pin description pin no pin description internal equivalent circuit description 1 cont 1 gnd gnd gnd gnd cont cont cont cont 52k 52k 52k 52k 38k 38k 38k 38k on/off control terminal please do not apply -0.4v or less to this pin. the current might flow from gnd. 2 vee - input terminal 3np gnd gnd gnd gnd vref vref vref vref 3 np np np np 10k 10k 10k 10k 500k 500k 500k 500k 27k 27k 27k 27k noise pass terminal 4 gnd - gnd terminal 5 vout vout vout vout vout 6 vee vee vee vee gnd gnd gnd gnd r1 r1 r1 r1 r2 r2 r2 r2 vref vref vref vref output terminal 1 2 1 r r r vref vout + =
tk721xxcs gc3-k020b page 23 12. applications information 12-1.definition of term relating characteristic note each characteristics will be measured in a short period not to be influenced by joint temperature (tj). *output voltage (vout) the output voltage is specified with vin= vout typ +1v and iout=5ma *output current (iout) output current, which can be used continuously (it is the range where overheating protection of the ic does not operate.) *peak output current (iout peak ) the rated output current is specified under the condition where the output voltage drops 90% by increasing the output current, compared to the value specified at vin=vout typ -1.5v. *dropout voltage (vdrop) it is an i/o voltage difference when the circuit stops the stable operation by decreasing the input voltage. it is measured when the output voltage drops 100mv from its nominal value by decreasing the input voltage gradually. *line regulation (linreg) it is the fluctuations of the output voltage value when the input voltage is changed. *load regulation (loareg) it is the fluctuations of output voltage value when the input voltage is assumed to be vout typ -1.5v, and the load current is changed. *ripple rejection (r.r) ripple rejection is the ability of the regulator to attenuate the ripple content of the input voltage at the output. it is measured with the condition of vin=vout-2.0v. ripple rejection is the ratio of the ripple content between the output vs. input and is expressed in db *standby current (istandby) it is an input current which flows to the control terminal, when the ic is turned off. relating protection circuit *over current protection it is a function to protect the ic by limiting the output current when excessive current flows to ic, such as the output is connected to gnd, etc. *thermal protection it protects the ic not to exceed the permissible power consumption of the package in case of large power loss inside the regulator. the output is turned off when the chip reaches around 150 c , but it turns on again when the temperature of the chip decreases. *esd it is tested by connecting charged capacitor to gnd pin and vin pin. mm 200pf 0 ? 200vmin hbm 100pf 1.5k ? 2000vmin
tk721xxcs gc3-k020b page 24 12-2. esr stability ic does operates with 1.0uf cout. if it is 1.0uf or larger, the capacitor of any type can be used in all range without considering esr. but due to the parts are uneven, please enlarge the capacitance as much as possible. with larger capacity, the output noise decreases more. in addition, the response to the load change, etc. can be improved. the ic won?t be damaged by enlarging the capacity. the input capacitor is necessary in case the battery voltage drops, the power supply impedance increases, or the distance to the power supply is far. 1 input capacitor might be necessary for each 1 ic or for several ics. it depends on circuit condition. please confirm the stability by each circuit. 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=-2.0 ~ -9.5v) condition:vin=vout typ -1.5v cin=0.1 f(mlcc) cout=1.0uf 0.01 0.1 1 10 100 0 50 100 150 iout (ma) esr ( ) *the output can be seen as oscillated when the overheating protection or the overcurrent protection start operation, or the input voltage is low. in this case, please lower the power consumption, decrease the load current or make the input voltage higher. selection of cout generally, a ceramic capacitor has the temperature characteristic and the voltage characteristic. please select parts in consideration of the voltage and the temperature used. toko recommend b characteristic type. stable area unstable area
tk721xxcs gc3-k020b page 25 12-3. operating region and power dissipation the power dissipation of the device is dependent on the junction temperature. therefore, the package dissipation is assumed to be an internal limitation. the package itself does not have enough heat radiation characteristic due to the small size. heat runs away by mounting ic on pcb. this value changes by the material, copper pattern etc. of pcb. the overheating protection operates when there is a lot of loss inside the regulator (ambient temperature high, heat radiation bad, etc.). the output current and the output voltage will drop when the protection circuit operates. when joint temperature (tj) reaches the set temperature, ic stops the operation. however, operation begins at once when joint temperature(tj) decrease. the thermal resistance when mounted on pcb the chip joint temperature during operation is shown by tj= japd+ta. joint part temperature (tj) of tk721xxcs is limited around 150 c with the overheating protection circuit. pd is the value when the overheating protection circuit starts operation. when you assume the ambient temperature to be 25 c, 150= ja pd(w)+25 ja pd=125 ja=125/pd ( c /w) example of mounting substrate pcb material: two layer glass epoxy substrate (x=30mm,y=30mm,t=1.0mm,copper pattern thickness 35um) please do derating with 5.9mw/ c at pd=736mw and 25 c or higher. thermal resistance is ( ja=170 c /w) method of obtaining pd easily connect output terminal to gnd(short circuited), and measure the input current by increasing the input voltage gradually up to 10v. the input current will reach the maximum output current, but will decrease soon according to the chip temperature rising, and will finally enter the state of thermal equilibrium (natural air cooling) the input current and the input voltage of this state will be used to calculate the pd. pd(mw) ? vin (v) iin (ma) when the device is mounted, mostly achieve 600mw 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 is short-circuited). 2. plot pd against 25 c. 3. connect pd to the point corresponding to the 150 c with a straight line. 4. pull a vertical line from the maximum operating temperature in your design (e.g., 75 c). 5. read the value of pd against the point at which the vertical line intersects the derating curve(dpd). 6. dpd (vinmax ? vout)=iout (at 75 c) 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.
tk721xxcs gc3-k020b page 26 the operation area pcb material : two layer glass epoxy substrate (x=30mm,y=30mm,t=1.0mm,copper pattern thickness 35um) pd when mounted on the substrate mentioned above (ta=25 c) sot23-5=736mw (derating ?5.9mw) the current which can be used continuously with ta=25 c min is calculated by the following. vout vin ta ma iout ? ? ? = ) 25 ( 9 . 5 736 ) ( - sot23-5 *iout<150ma the operation area is the part enclosed in the line including the ?0? mentioned in graph1 the overheating sensor may operate, or the output voltage may drop outside those area. the heat radiation characteristic changes in various conditions, so please check under your condition. graph1 0 25 50 85 125 150 pd (mw) 200 400 600 800 1000 unit-4.0mw on pcb -5.9mw graph2 ioutmax vs in-out voltage diff (sot23-5) 0 20 40 60 80 100 120 140 160 012345678910 in-out voltage diff (v) iout max (ma) ta=+85 ta=+85 ta=+85 ta=+85 ta=+70 ta=+70 ta=+70 ta=+70 ta=+50 ta=+50 ta=+50 ta=+50 ta=+25 ta=+25 ta=+25 ta=+25 unit on pcb ta ( c)
tk721xxcs gc3-k020b page 27 12-4 application hint *when using together with positive output regulator positive reg tk721xxc negative reg vout vout vout vout vout vout vout vout load load load load when using positive output regulator together with this device, sometimes the voltage may not be outputted. to solve this problem, please connect schottkey diode between gnd and output, or change the timing of on/off. *when not using on/off function please connect the cont terminal to gnd. *notes when evaluating with output terminal is connected to gnd(short-circuit) the output terminal becomes plus potential by the resonance of cout (c element) connected to output and the short-circuit line (l element). when the output terminal becomes positive, parasitism tr is caused inside the ic. the latch-up phenomenon occurs and in the worst case, ic may be damaged.(f 0 =1 / 2 (l c)) this resonance appears remarkably when using a ceramic capacitor with small esr, etc. this can be solved by connecting 2 ? resistance in series. as a result, the latch-up phenomenon in ic can be prevented. generally, tantalum capacitor has enough esr value and the influence of the resonance decreases.
tk721xxcs gc3-k020b page 28 13. 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. " 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. " 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. " 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. 2004 . 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 the ozone depleting substances(ods) under the montreal protocol are used in our manufacturing process. 14. 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/ semiconductor division your distributor

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