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october 1999 toko, inc. page 1 tk112xxb features high voltage precision at 2.0% active high on/off control very low dropout voltage 80 mv at 30 ma very low noise very small sot-23l or sot-89 surface mount packages internal thermal shutdown short circuit protection applications battery powered systems cellular telephones pagers personal communications equipment portable instrumentation portable consumer equipment radio control systems toys low voltage systems block diagram tk112xxb gnd control v out v in noise bypass gnd v out gnd noise bypass gnd control v in description the tk112xxb is a low dropout linear regulator with a built- in electronic switch. the internal switch can be controlled by ttl or cmos logic levels. the device is in the on state when the control pin is pulled to a logic high level. an external capacitor can be connected to the noise bypass pin to lower the output noise level to 30 vrms. an internal pnp pass transistor is used to achieve a low dropout voltage of 80 mv (typ.) at 30 ma load current. the tk112xxb has a very low quiescent current of 170 a at no load and 1 ma with a 30 ma load. the standby current is typically 100 na. the internal thermal shut down circuitry limits the junction temperature to below 150 c. the load current is internally monitored and the device will shut down in the presence of a short circuit or overcurrent condition at the output. the tk112xxb is available in either a 6-pin sot-23l or a 5-pin sot-89 surface mount package. ordering information tape/reel code l: tape left (sot-23l) b: tape left (sot-89) temp. code: c: -30 to +80 c i: -40 to +85 c tape/reel code tk112 b voltage code package code package code: m: sot-23l u: sot-89 note 1: 1.3 v to 1.9 v available in sot-23l package only. note 2: 1.3 v to 2.4 v available in c temperature code (-30 to +80 c) only. voltage code 13 = 1.3 v 33 = 3.3 v 14 = 1.4 v 34 = 3.4 v 15 = 1.5 v 35 = 3.5 v 16 = 1.6 v 36 = 3.6 v 17 = 1.7 v 37 = 3.7 v 18 = 1.8 v 38 = 3.8 v 19 = 1.9 v 39 = 3.9 v 20 = 2.0 v 40 = 4.0 v 21 = 2.1 v 41 = 4.1 v 22 = 2.2 v 42 = 4.2 v 23 = 2.3 v 43 = 4.3 v 24 = 2.4 v 44 = 4.4 v 25 = 2.5 v 45 = 4.5 v 26 = 2.6 v 46 = 4.6 v 27 = 2.7 v 47 = 4.7 v 28 = 2.8 v 48 = 4.8 v 29 = 2.9 v 49 = 4.9 v 30 = 3.0 v 50 = 5.0 v 31 = 3.1 v 55 = 5.5 v 32 = 3.2 v 80 = 8.0 v temp. code 20p noise bypass v in v out thermal protection bandgap reference control gnd sot-23l sot-89 voltage regulator with on/off switch
page 2 october 1999 toko, inc. tk112xxb supply voltage ......................................................... 16 v power dissipation sot-23l (note1) .................. 600 mw power dissipation sot-89 (note1) .................... 900 mw reverse bias ............................................................ 10 v storage temperature range ................... -55 to +150 c operating temperature range ...................-30 to +80 c operating voltage range ............................ 1.8 to 14.5 v junction temperature ........................................... 150 c absolute maximum ratings tk112xxbc (v out 2.0 v) tk112xxbc electrical characteristics (v out 2.0 v) test conditions: t a = 25 c, unless otherwise specified. note 1: when mounted as recommended. derate at 4.8 mw/ c for sot-23l and 6.4 mw/ c for sot-89 packages for operation above 25 c. note 2: refer to definition of terms. note 3: ripple rejection and noise voltage are affected by the value and characteristics of the capacitor used. note 4: output noise voltage can be reduced by connecting a capacitor to a noise pass terminal. gen. note: parameters with min. or max. values are 100% tested at t a = 25 c. l o b m y sr e t e m a r a ps n o i t i d n o c t s e tn i mp y tx a ms t i n u i q t n e r r u c t n e c s e i u qi t u o i g n i d u l c x e , a m 0 = t n o c 0 7 10 5 2a i y b t s t n e r r u c y b d n a t sv n i f f o t u p t u o , v 8 =1 . 0a v t u o e g a t l o v t u p t u oi t u o a m 0 3 =1 e l b a t e e sv g e r e n i ln o i t a l u g e r e n i l v t u o ) 2 e t o n ( , v 5 . 50 . 30 2v m v t u o ) 2 e t o n ( , v 6 . 55 10 4v m g e r d a o ln o i t a l u g e r d a o l i t u o ) 2 e t o n ( , a m 0 6 o t 1 =60 3v m i t u o ) 2 e t o n ( , a m 0 0 1 o t 1 =8 10 6v m i t u o ) 2 e t o n ( , a m 0 5 1 o t 1 =3 20 9v m v p o r d e g a t l o v t u o p o r d i t u o ) 2 e t o n ( , a m 0 6 =2 1 . 00 2 . 0v i t u o ) 2 e t o n ( , a m 0 5 1 =6 2 . 09 3 . 0v i t u o t n e r r u c t u p t u o s u o u n i t n o c) 2 e t o n (0 5 1a m i ) e s l u p ( t u o t n e r r u c t u p t u o e s l u pe l c y c y t u d % 5 . 2 1 , e s l u p s m 50 8 1a m r rn o i t c e j e r e l p p i r c , z h 0 0 4 = f l c , f 0 1 = n , f 1 . 0 = v n i v = t u o i , v 5 . 1 + t u o , a m 0 3 = v e l p p i r ) 3 e t o n ( , s m r v m 0 0 1 = 0 6b d v o n e g a t l o v e s i o n t u p t u o z h 0 1 f c , z h k 0 8 l , f 0 1 = c n v , f 1 . 0 = n c v = t u o , v 5 . 1 + i t u o ) 4 , 3 s e t o n ( , a m 0 6 = 0 3s m r v v f e r l a n i m r e t s s a p y b e s i o n e g a t l o v 5 2 . 1v ? v t u o / ? t t n e i c i f f e o c e r u t a r e p m e ti t u o a m 0 1 =0 4c / m p p s n o i t a c i f i c e p s l a n i m r e t l o r t n o c i t n o c t n e r r u c l o r t n o cv t n o c n o t u p t u o , v 8 . 1 =2 15 3a v ) n o ( t n o c n o e g a t l o v l o r t n o cn o t u p t u o8 . 1v v ) f f o ( t n o c f f o e g a t l o v l o r t n o cf f o t u p t u o6 . 0v
october 1999 toko, inc. page 3 tk112xxb supply voltage ......................................................... 16 v power dissipation sot-23l (note1) .................. 600 mw power dissipation sot-89 (note1) .................... 900 mw reverse bias .............................................................. 7 v storage temperature range ................... -55 to +150 c operating temperature range ................... -30 to +80 c operating voltage range ............................ 1.8 to 14.5 v junction temperature ........................................... 150 c absolute maximum ratings tk1121xbc (v out 1.9 v) tk1121xbc electrical characteristics (v out 1.9 v) test conditions: t a = 25 c, unless otherwise specified. note 1: when mounted as recommended. derate at 4.8 mw/ c for sot-23l and 6.4 mw/ c for sot-89 packages for operation above 25 c. note 2: refer to definition of terms. note 3: ripple rejection and noise voltage are affected by the value and characteristics of the capacitor used. note 4: output noise voltage can be reduced by connecting a capacitor to a noise pass terminal. gen note: parameters with min. or max. values are 100% tested at t a = 25 c. l o b m y sr e t e m a r a ps n o i t i d n o c t s e tn i mp y tx a ms t i n u i q t n e r r u c t n e c s e i u qi t u o i g n i d u l c x e , a m 0 = t n o c 0 7 10 5 2a i y b t s t n e r r u c y b d n a t sv n i f f o t u p t u o , v 8 =1 . 0a v t u o e g a t l o v t u p t u oi t u o a m 0 3 =2 e l b a t e e sv g e r e n i ln o i t a l u g e r e n i l) 2 e t o n (0 . 30 2v m g e r d a o ln o i t a l u g e r d a o l i t u o ) 2 e t o n ( , a m 0 6 o t 1 =60 3v m i t u o ) 2 e t o n ( , a m 0 0 1 o t 1 =8 10 6v m i t u o t n e r r u c t u p t u o s u o u n i t n o c v 4 . 2 v n i ) 2 e t o n ( , v 6 . 20 3 1a m v n i ) 2 e t o n ( , v 6 . 20 5 1a m i ) e s l u p ( t u o t n e r r u c t u p t u o e s l u p v , e s l u p s m 5 n i , v 6 . 2 e l c y c y t u d % 5 . 2 1 0 8 1a m r rn o i t c e j e r e l p p i r c , z h 0 0 4 = f l c , f 0 1 = n , f 1 . 0 = v n i v = t u o i , v 5 . 1 + t u o , a m 0 3 = v e l p p i r ) 3 e t o n ( , s m r v m 0 0 1 = 5 5b d v o n e g a t l o v e s i o n t u p t u o z h 0 1 f c , z h k 0 8 l , f 0 1 = c n v , f 1 . 0 = n c v = t u o , v 5 . 1 + i t u o ) 4 , 3 s e t o n ( , a m 0 6 = 0 3s m r v v f e r l a n i m r e t s s a p y b e s i o n e g a t l o v 5 2 . 1v ? v t u o / ? t t n e i c i f f e o c e r u t a r e p m e ti t u o a m 0 1 =0 4c / m p p s n o i t a c i f i c e p s l a n i m r e t l o r t n o c i t n o c t n e r r u c l o r t n o cv t n o c n o t u p t u o , v 8 . 1 =2 15 3a v ) n o ( t n o c n o e g a t l o v l o r t n o cn o t u p t u o8 . 1v v ) f f o ( t n o c f f o e g a t l o v l o r t n o cf f o t u p t u o6 . 0v
page 4 october 1999 toko, inc. tk112xxb tk112xxbi electrical characteristics (v out 2.5 v) test conditions: t a = -40 to 85 c, unless otherwise specified. supply voltage ......................................................... 16 v power dissipation sot-23l (note1) .................. 600 mw power dissipation sot-89 (note1) .................... 900 mw reverse bias ............................................................ 10 v storage temperature range ................... -55 to +150 c operating temperature range ...................-40 to +85 c operating voltage range ............................ 1.8 to 14.5 v junction temperature ........................................... 150 c absolute maximum ratings tk112xxbi (v out 2.5 v) l o b m y sr e t e m a r a ps n o i t i d n o c t s e tn i mp y tx a ms t i n u i q t n e r r u c t n e c s e i u qi t u o i g n i d u l c x e , a m 0 = t n o c 0 7 10 0 3a i y b t s t n e r r u c y b d n a t sv n i f f o t u p t u o , v 8 =2 . 0a v t u o e g a t l o v t u p t u oi t u o a m 0 3 =3 e l b a t e e sv g e r e n i ln o i t a l u g e r e n i l v t u o ) 2 e t o n ( , v 5 . 50 . 35 2v m v t u o ) 2 e t o n ( , v 6 . 55 10 4v m g e r d a o ln o i t a l u g e r d a o l i t u o ) 2 e t o n ( , a m 0 6 o t 1 =60 4v m i t u o ) 2 e t o n ( , a m 0 0 1 o t 1 =8 10 8v m i t u o ) 2 e t o n ( , a m 0 5 1 o t 1 =3 20 1 1v m v p o r d e g a t l o v t u o p o r d i t u o ) 2 e t o n ( , a m 0 6 =2 1 . 03 2 . 0v i t u o ) 2 e t o n ( , a m 0 5 1 =6 2 . 00 4 . 0v i t u o t n e r r u c t u p t u o s u o u n i t n o c) 2 e t o n (0 5 1a m i ) e s l u p ( t u o t n e r r u c t u p t u o e s l u pe l c y c y t u d % 5 . 2 1 , e s l u p s m 50 8 1a m r rn o i t c e j e r e l p p i r c , z h 0 0 4 = f l c , f 0 1 = n , f 1 . 0 = v n i v = t u o i , v 5 . 1 + t u o , a m 0 3 = v e l p p i r ) 3 e t o n ( , s m r v m 0 0 1 = 0 6b d v o n e g a t l o v e s i o n t u p t u o z h 0 1 f c , z h k 0 8 l , f 0 1 = c n v , f 1 . 0 = n c v = t u o , v 5 . 1 + i t u o ) 4 , 3 s e t o n ( , a m 0 6 = 0 3s m r v v f e r l a n i m r e t s s a p y b e s i o n e g a t l o v 5 2 . 1v ? v t u o / ? t t n e i c i f f e o c e r u t a r e p m e ti t u o a m 0 1 =0 4c / m p p s n o i t a c i f i c e p s l a n i m r e t l o r t n o c i t n o c t n e r r u c l o r t n o cv t n o c n o t u p t u o , v 8 . 1 =2 10 4a v ) n o ( t n o c n o e g a t l o v l o r t n o cn o t u p t u o0 . 2v v ) f f o ( t n o c f f o e g a t l o v l o r t n o cf f o t u p t u o5 . 0v note 1: when mounted as recommended. derate at 4.8 mw/ c for sot-23l and 6.4 mw/ c for sot-89 packages for operation above 25 c. note 2: refer to definition of terms. note 3: ripple rejection and noise voltage are affected by the value and characteristics of the capacitor used. note 4: output noise voltage can be reduced by connecting a capacitor to a noise pass terminal. gen note: parameters with min. or max. values are 100% tested at t a = 25 c. gen note: for line regulation, typ. and max. is changed to v out > 5.6 v.
october 1999 toko, inc. page 5 tk112xxb output voltage v out(min) v out(max) test voltage code voltage 1.3 v 13 1.240 v 1.36 v 2.4 v 1.4 v 14 1.340 v 1.46 v 2.4 v 1.5 v 15 1.440 v 1.560 v 2.4 v 1.6 v 16 1.540 v 1.660 v 2.4 v 1.7 v 17 1.640 v 1.760 v 2.4 v 1.8 v 18 1.740 v 1.860 v 2.4 v 1.9 v 19 1.804 v 1.960 v 2.4 v output voltage v out(min) v out(max) test voltage code voltage 2.0 v 20 1.940 v 2.060 v 3.0 v 2.1 v 21 2.040 v 2.160 v 3.1 v 2.2 v 22 2.140 v 2.260 v 3.2 v 2.3 v 23 2.240 v 2.360 v 3.3 v 2.4 v 24 2.340 v 2.460 v 3.4 v 2.5 v 25 2.440 v 2.560 v 3.5 v 2.6 v 26 2.540 v 2.660 v 3.6 v 2.7 v 27 2.640 v 2.760 v 3.7 v 2.8 v 28 2.740 v 2.860 v 3.8 v 2.9 v 29 2.840 v 2.960 v 3.9 v 3.0 v 30 2.940 v 3.060 v 4.0 v 3.1 v 31 3.040 v 3.160 v 4.1 v 3.2 v 32 3.140 v 3.260 v 4.2 v 3.3 v 33 3.240 v 3.360 v 4.3 v 3.4 v 34 3.335 v 3.465 v 4.4 v 3.5 v 35 3.435 v 3.565 v 4.5 v 3.6 v 36 3.535 v 3.665 v 4.6 v output voltage v out(min) v out(max) test voltage code voltage 3.7 v 37 3.630 v 3.770 v 4.7 v 3.8 v 38 3.725 v 3.875 v 4.8 v 3.9 v 39 3.825 v 3.975 v 4.9 v 4.0 v 40 3.920 v 4.080 v 5.0 v 4.1 v 41 4.020 v 4.180 v 5.1 v 4.2 v 42 4.120 v 4.280 v 5.2 v 4.3 v 43 4.215 v 4.385 v 5.3 v 4.4 v 44 4.315 v 4.485 v 5.4 v 4.5 v 45 4.410 v 4.590 v 5.5 v 4.6 v 46 4.510 v 4.690 v 5.6 v 4.7 v 47 4.605 v 4.795 v 5.7 v 4.8 v 48 4.705 v 4.895 v 5.8 v 4.9 v 49 4.800 v 5.000 v 5.9 v 5.0 v 50 4.900 v 5.100 v 6.0 v 5.5 v 55 5.390 v 5.610 v 6.5 v 8.0 v 80 7.840 v 8.160 v 9.0 v tk112xxbmc electrical characteristics table 1 test conditions: t a = 25 c, i out = 30 ma, unless otherwise specified. tk112xxbc electrical characteristics table 2 test conditions: t a = 25 c, i out = 30 ma, unless otherwise specified.
page 6 october 1999 toko, inc. tk112xxb tk112xxbi electrical characteristics table 3 test conditions: v in = v out(typ) + 1 v, i out = 30 ma, unless otherwise specified. room temp. range (t a = 25 c) full temp. range (t a = -40 to +85 c) output voltage v out(min) v out(max) v out(min) v out(max) voltage code 2.5 v 25 2.440 v 2.560 v 2.400 v 2.600 v 2.6 v 26 2.540 v 2.660 v 2.500 v 2.700 v 2.7 v 27 2.640 v 2.760 v 2.600 v 2.800 v 2.8 v 28 2.750 v 2.860 v 2.700 v 2.900 v 2.9 v 29 2.840 v 2.960 v 2.800 v 3.000 v 3.0 v 30 2.940 v 3.060 v 2.900 v 3.100 v 3.1 v 31 3.040 v 3.160 v 3.000 v 3.200 v 3.2 v 32 3.140 v 3.260 v 3.095 v 3.305 v 3.3 v 33 3.240 v 3.360 v 3.190 v 3.410 v 3.4 v 34 3.335 v 3.465 v 3.290 v 3.510 v 3.5 v 35 3.435 v 3.565 v 3.385 v 3.615 v 3.6 v 36 3.535 v 3.665 v 3.485 v 3.720 v 3.7 v 37 3.630 v 3.770 v 3.580 v 3.820 v 3.8 v 38 3.725 v 3.875 v 3.675 v 3.925 v 3.9 v 39 3.825 v 3.975 v 3.770 v 4.030 v 4.0 v 40 3.920 v 4.080 v 3.870 v 4.130 v 4.1 v 41 4.020 v 4.180 v 3.965 v 4.235 v 4.2 v 42 4.120 v 4.280 v 4.060 v 4.335 v 4.3 v 43 4.215 v 4.385 v 4.160 v 4.440 v 4.4 v 44 4.315 v 4.485 v 4.255 v 4.545 v 4.5 v 45 4.410 v 4.590 v 4.350 v 4.645 v 4.6 v 46 4.510 v 4.690 v 4.450 v 4.750 v 4.7 v 47 4.605 v 4.795 v 4.545 v 4.850 v 4.8 v 48 4.705 v 4.895 v 4.640 v 4.955 v 4.9 v 49 4.800 v 5.000 v 4.740 v 5.060 v 5.0 v 50 4.900 v 5.100 v 4.835 v 5.165 v 5.5 v 55 5.390 v 5.610 v 5.320 v 5.680 v 8.0 v 80 7.840 v 8.160 v 7.745 v 8.265 v
october 1999 toko, inc. page 7 tk112xxb cont noise bypass v cont 1 i in i out c n 0.1 f v out v in 1.0 f 2.2 f i cont v in + + + + v out i out i cont c n 0.1 f cont v cont 1 f v in v in i in v out + noise bypass + + v out 2.2 f typical performance characteristics t a = 25 c, unless otherwise specified. test circuits sot-23l sot-89 v in cont v out r s 1 f c n c l = 10 f to 0.22 f 0.1 f 112xxb output voltage response (off on) 0 200 600 time (s) 400 800 c n = 0.01 f c n = 0.1 f c l = 2.2 f i load = 30 ma v cont v out load regulation 0 50 100 i out (ma) v out (5 mv/div) v out(typ) short circuit current 0 150 300 i out (ma) v out (v) 5 4 3 2 1 0 output voltage vs. input voltage 0v in = v out v in (v) (50 mv/div) i out = 30 ma i out = 50 ma i out = 90 ma i out = 0 ma v out (25 m v/div) v out(typ) line regulation 0 10 20 v in (v) v out (50 mv/div) v out(typ) dropout voltage vs. output current 0 200 i out (ma) v drop (mv) -400 -300 -200 0 100 -100 transient response note: connect pin 5 to ground for heat sink
page 8 october 1999 toko, inc. tk112xxb ground current vs. output current 0 100 200 i out (ma) i gnd (ma) 10 8 6 4 2 0 reverse bias current (v in = 0 v) 020 v rev (v) 0 i rev ( a) 100 200 300 400 500 10 1.9 v 2.0 v v out = 1.3 v upper quiescent current (off mode) vs. input voltage 020 v in (v) 0 i q (pa) 50 100 10 quiescent current (on mode) vs. input voltage 05 0 i q (ma) 0.5 1.0 2.5 v in (v) i out = 0 ma v out = 1.3 to 1.8 v v out = 1.9 v v out ground current -50 100 0 i gnd (ma) 2 1 050 t a ( c) i out = 60 ma i out = 30 ma dropout voltage -50 100 0 v drop (mv) 100 050 200 300 400 500 t a ( c) i out = 150 ma i out = 60 ma i out = 30 ma control current -50 100 0 i cont (a) 10 050 30 40 50 t a ( c) 20 v cont = 5 v v cont = 1.8 v v cont (v out , on point) -50 100 0 v cont (v) 50 1.0 2.0 t a ( c) 0 r cont = 0 ? quiescent current (on mode) vs . input voltage 010 0 i q (ma) 1 2 5 v in (v) i out = 0 ma v out = 3 v 5 v 2 v 4 v v out = 1.3 to 1.8 v typical performance characteristics (cont.) t a = 25 c, unless otherwise specified.
october 1999 toko, inc. page 9 tk112xxb output voltage variation -50 100 ? v out (mv) 050 t a ( c) -20 -10 0 10 -30 v out = 2 v 4 v 5 v 3 v line voltage step response v in v out c n = 0.001 f, c l = .22 f c n = 0.01 f, c l = 2.2 f v out +2 v v out +1 v v out time (50 s/div) v out (10 mv/div) load current step response i out v out c n = 0.01 f, c l = 2.2 f 100 ma 50 ma c n = 0.1 f, c l = 10 f v out time (50 s/div) v out (50 m v/div) noise level vs. c n 1 pf 10 c n 50 noise (v) 200 100 150 250 1000 0 100 .01 f .1 c l = 2.2 f v out = 3 v i out = 60 ma c l = 10 f c l = 3.3f noise spectrum 01 m -100 db 0 -50 500 k f (hz) c l = 3.3 f, c n = none c l = 3.3 f, c n = 0.1 f spectrum analyzer back- ground noise -50 100 i out (ma) 050 280 t a ( c) 240 250 260 270 v out = 1.9 v v out = 2 to 2.6 v v out = 2.7 v v out = 1.3 v maximum output current upper under ripple rejection 0.01 0.1 f (khz) -80 rr (db) -20 -60 -40 0 1 -100 10 100 c n = 0.1 f c n = 0.01 f i out = 30 ma typical performance characteristics (cont.) t a = 25 c, unless otherwise specified.
page 10 october 1999 toko, inc. tk112xxb output voltage vs. output current 0 300 v out (v) 1.1 100 200 1.2 1.3 i out (ma) 2.4 v 2.1 v 2.0 v 1.9 v v in = 1.8 v output voltage vs. input voltage 1.6 2.1 v out (v) 1.1 1.3 1.7 1.2 1.8 1.9 2.0 v in (v) 150 ma 120 ma 90 ma 60 ma 30 ma i out = 0 ma output voltage vs. output current 0 300 v out (v) 1.2 100 200 1.3 1.4 i out (ma) 2.4 v 2.0 v 2.1 v 1.9 v v in = 1.8 v output voltage vs. input voltage 1.6 2.1 v out (v) 1.2 1.4 1.7 1.3 1.8 1.9 2.0 v in (v) i out = 0 ma 30 ma 60 ma 150 ma 120 ma 90 ma output voltage vs. output current 0 300 v out (v) 1.3 100 200 1.4 1.5 i out (ma) v in = 1.8 v 1.9 v 2.4 v 2.1 v 2.0 v output voltage vs. input voltage 1.6 2.1 v out (v) 1.3 1.5 1.7 1.4 1.8 1.9 2.0 v in (v) i out = 0 ma 30 ma 60 ma 150 ma 120 ma 90 ma tk11213b tk11214b tk11215b typical performance characteristics (cont.) t a = 25 c, unless otherwise specified.
october 1999 toko, inc. page 11 tk112xxb output voltage vs. input voltage 1.6 2.1 v out (v) 1.5 1.7 1.7 1.6 1.8 1.9 2.0 v in (v) i out = 0 ma 30 ma 60 ma 150 ma 120 ma 90 ma output voltage vs. input voltage 1.6 2.1 v out (v) 1.4 1.6 1.7 1.5 1.8 1.9 2.0 v in (v) i out = 0 ma 30 ma 60 ma 150 ma 90 ma 120 ma tk11216b tk11217b tk11218b output voltage vs. output current 0 300 v out (v) 1.4 100 200 1.5 1.6 i out (ma) v in = 1.8 v 1.9 v 2.0 v 2.1 v 2.4 v output voltage vs. output current 0 300 v out (v) 1.5 100 200 1.6 1.7 i out (ma) v in = 1.8 v 1.9 v 2.4 v 2.0 v 2.1 v output voltage vs. output current 0 300 v out (v) 1.6 100 200 1.7 1.8 i out (ma) 1.9 v 2.0 v 2.1 v 2.4 v v in = 1.8 v output voltage vs. input voltage 1.7 2.2 v out (v) 1.6 1.8 1.8 1.7 1.9 2.0 2.1 v in (v) i out = 0 ma 150 ma 120 ma 90 ma 60 ma 30 ma typical performance characteristics (cont.) t a = 25 c, unless otherwise specified.
page 12 october 1999 toko, inc. tk112xxb output voltage vs. input voltage 1.7 2.2 v out (v) 1.7 1.9 1.8 1.8 1.9 2.0 2.1 v in (v) 150 ma 120 ma 30 ma 60 ma 90 ma i out = 0 ma tk11219b output voltage vs. output current 0 300 v out (v) 1.7 100 200 1.8 1.9 i out (ma) 2.2 v 2.1 v 2.0 v v in = 1.9 v 2.4 v typical performance characteristics (cont.) t a = 25 c, unless otherwise specified.
october 1999 toko, inc. page 13 tk112xxb definition and explanation of technical terms output voltage (v out ) the output voltage is specified with v in = (v out(typ) + 1 v) and i out = 30 ma. dropout voltage (v drop ) 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. output current (i out(max) ) this is the maximum continuous output current specified under the condition where the output voltage drops 0.3 v below the value specified with i out = 30 ma. the input voltage is set to v out +1 v, and the current is pulsed to minimize temperature effect. continuous output current (i out ) normal operating output current. this is limited by package power dissipation. pulse output current (i out(pulse) ) maximum pulse width 5 ms at v out upper 2.0 v; 7 ms. at v out under 1.9 v; duty cycle 12.5%: pulse load only. line regulation (line reg) 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 v in = v out(typ) + 1 v to v in = v out(typ) + 6 v. load regulation (load reg) 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 v in = v out +1 v. the load regulation is specified under two output current step conditions of 1 ma to 60 ma and 1 ma to 100 ma. quiescent current (i q ) the quiescent current is the current which flows through the ground terminal under no load conditions (i out = 0 ma). ground curren t (i gnd ) ground current is the current which flows through the ground pin(s). it is defined as i in - i out , excluding i cont . ripple rejection ratio (rr) ripple rejection is the ability of the regulator to attenuate the ripple content of the input voltage at the output. it is specified with 100 mvrms, 400 hz superimposed on the input voltage, where v in = v out + 1.5 v. the output decoupling capacitor is set to 10 f, the noise bypass capacitor is set to 0.1 f, and the load current is set to 30 ma. ripple rejection is the ratio of the ripple content of the output vs. the input and is expressed in db. standby current (i stby ) standby current is the current which flows into the regulator when the output is turned off by the control function (v cont = 0 v). it is measured with v in = 8 v (9 v for the 8 v output device). sensor circuits overcurrent sensor the overcurrent sensor protects the device in the event that the output is shorted to ground. thermal sensor the thermal sensor protects the device in the event that the junction temperature exceeds the safe value (t j = 150 c). 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 conditions.
page 14 october 1999 toko, inc. tk112xxb reverse voltage protection 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. control function definition and explanation of technical terms (cont.) c n v in sw r c sot-23l c n v in sw r c sot-89 control pin current vs. voltage 0 123 v cont (v) 0 i cont ( a) 10 20 30 40 50 45 v out r cont =100k r cont = 0 if the control function is not used, connect the control terminal to v in . when the control function is used, the control current can be reduced by inserting a series resistor (r cont ) between the control terminal and v in . the value of this resistor should be determined from the graph below.
october 1999 toko, inc. page 15 tk112xxb on/off response with control and load transient response the turn-on time depends upon the value of the output capacitor and the noise bypass capacitor. the turn-on time will increase with the value of either capacitor. the graphs below show the relationship between turn-on time and load capacitance. if the value of these capacitors is reduced, the load and line regulation will suffer and the noise voltage will increase. if the value of these capacitors is increased, the turn-on time will increase. definition and explanation of technical terms (cont.) output voltage response (off on) -5 5 25 15 35 c l = 0.33 f 45 c l = 1.0 f c l = 1.5 f c l = 0.47 f time (s) i load = 10 ma, c n = 1000 pf v out v cont load current step response -5 5 15 35 25 45 time( s) c l = 0.33 f v out (200 mv/div) i load i load = 5 to 35 ma 30 to 60 ma 0 to 30 ma reduction of output noise although the architecture of the toko regulators is designed to minimize semiconductor noise, further reduction can be achieved by the selection of external components. the obvious solution is to increase the size of the output capacitor. a more effective solution would be to add a capacitor to the noise bypass terminal. the value of this capacitor should be 0.1 f or higher (higher values provide greater noise reduction). although stable operation is possible without the noise bypass capacitor, this terminal has a high impedance and care should be taken to avoid a large circuit area on the printed circuit board when the capacitor is not used. please note that several parameters are affected by the value of the capacitors and bench testing is recommended when deviating from standard values. output voltage response (off on) 0 200 600 time (s) 400 800 c n = 0.01 f c n = 0.1 f c l = 2.2 f i load = 30 ma v cont v out
page 16 october 1999 toko, inc. tk112xxb the output side is shorted. input current gradually falls as temperature rises. you should use the value when thermal equilibrium is reached. the range of usable currents can also be found from the graph below. procedure: 1) find p d 2) p d1 is taken to be p d x (~0.8 - 0.9) 3) plot p d1 against 25 c 4) connect p d1 to the point corresponding to the 150 c with a straight line. 5) in design, take a vertical line from the maximum operating temperature (e.g., 75 c) to the derating curve. 6) read off the value of p d against the point at which the vertical line intersects the derating curve. this is taken as the maximum power dissipation, d pd . the maximum operating current is: i out = (d pd / (v in(max) - v out ) package power dissipation (p d ) this is the power dissipation level at which the thermal sensor is activated. the ic contains an internal thermal sensor which monitors the junction temperature. when the junction temperature exceeds the monitor threshold of 150 c, the ic is shut down. the junction temperature rises as the difference between the input power (v in x i in ) and the output power (v out x i out ) increases. the rate of temperature rise is greatly affected by the mounting pad configuration on the pcb, the board material, and the ambient temperature. when the ic mounting has good thermal conductivity, the junction temperature will be low even if the power dissipation is great. when mounted on the recommended mounting pad, the power dissipation of the sot-23l is increased to 600 mw. for operation at ambient temperatures over 25 c, the power dissipation of the sot-23l device should be derated at 4.8 mw/ c. the power dissipation of the sot-89 package is 900 mw when mounted as recommended. derate the power dissipation at 7.2 mw/ c for operation above 25 c. to determine the power dissipation for shutdown when mounted, attach the device on the actual pcb and deliberately increase the output current (or raise the input voltage) until the thermal protection circuit is activated. calculate the power dissipation of the device by subtracting the output power from the input power. these measurements should allow for the ambient temperature of the pcb. the value obtained from p d /(150 c - t a ) is the derating factor. the pcb mounting pad should provide maximum thermal conductivity in order to maintain low device temperatures. as a general rule, the lower the temperature, the better the reliability of the device. the thermal resistance when mounted is expressed as follows: t j = 0 ja x p d + t a for toko ics, the internal limit for junction temperature is 150 c. if the ambient temperature (t a ) is 25 c, then: 150 c = 0 ja x p d + 25 c 0 ja = 125 c/ p d p d is the value when the thermal sensor is activated. a simple way to determine p d is to calculate v in x i in when definition and explanation of technical terms (cont.) p d d pd 25 50 75 150 (mw) t a ( c) 3 6 5 4
october 1999 toko, inc. page 17 tk112xxb sot-23l power dissipation curve sot-89 power dissipation curve 0 50 100 t a ( c) p d ( m w) 150 0 450 750 150 300 600 mounted as shown free air 0 50 100 t a ( c) p d (mw) 150 0 600 1000 200 400 800 mounted as shown free air application note copper pattern should be as large as possible. power dissipation is 600 mw for sot-23l and 900 mv for sot-89. a low equivalent series resistance (esr) capacitor is recommended. for low temperature operation, select a capacitor with a low esr at the lowest operating temperature to prevent oscillation, degradation of ripple rejection and increase in noise. the minimum recommended capacitance is 2.2 f. sot-89 board layout sot-23l board layout definition and explanation of technical terms (cont.)
page 18 october 1999 toko, inc. tk112xxb 1000 100 10 1 0.1 0.01 1 50 100 150 i out (ma) stable operation area esr ( ?) 1000 100 10 1 0.1 0 .01 1 50 100 150 i out (ma) esr ( ?) stable operation area 1000 100 10 1 0.1 0.01 1 50 100 150 i out (ma) stable operation area esr ( ? ) 1000 100 10 1 0.1 0.01 1 50 100 150 i out (ma) stable operation area esr ( ? ) application information in general, the capacitor should be at least 1 f (aluminum electrolytic) and be rated for the actual ambient operating temperature range. the table below shows typical characteristics for several types and values of capacitance. please note that the esr varies widely depending upon manufacturer, type, size, and material. c l = 1 fc l = 2.2 f c l = 3.3 f c l = 10 f note: esr is measured at 10 khz. input-output capacitors linear regulators require an output capacitor in order to maintain regulator loop stability. this capacitor should be selected to ensure stable operation over the desired temperature and load range. the graphs below show the effects of capacitance value and esr on the stable operation area. 2.0 v 3.0 v 5.0 v 112xxb c l esr v out = esr capacitance aluminum capacitor tantalum capacitor ceramic capacitor 1.0 f 2.4 ? 2.3 ? 0.140 ? 2.2 f 2.0 ? 1.9 ? 0.059 ? 3.3 f 4.6 ? 1.0 ? 0.049 ? 10 f 1.4 ? 0.5 ? 0.025 ?
october 1999 toko, inc. page 19 tk112xxb comparison between tk112xx and tk112xxb specification parameter tk112xx tk112xxb output voltage tolerance 3.0% 2.0% quiescent current 180 a 170 a output current 130 ma 150 ma dropout voltage (i out = 50 ma) 160 mv 110 mv ripple rejection at low line regulation point (see figure below) superior built-in reverse bias protection no yes esd protection superior v out tk112xxb tk112xx input ripple noise
page 20 october 1999 toko, inc. tk112xxb comparison between tk112xx and tk112xxb tk112xx tk112xxb quiescent current vs. output current i out (ma) i q (ma) 0 6 10 0 100 200 2 4 8 quiescent current vs. output current i out (ma) i q (ma) 0 6 10 0 100 200 2 4 8 short circuit current i out (ma) v out (v) 0 3 5 0 150 300 1 2 4 short circuit current i out (ma) v out (v) 0 3 5 0 150 300 1 2 4 dropout voltage vs. output current i out (ma) v drop (mv) -200 0 0 100 200 -400 -300 -100 dropout voltage vs. output current i out (ma) v drop (mv) -200 0 0 100 200 -400 -300 -100
october 1999 toko, inc. page 21 tk112xxb comparison between tk112xx and tk112xxb tk112xx tk112xxb output voltage vs. input voltage v in (v) (50 mv/div) v out (25 mv/div) 0 5 i out = 0 ma i out = 30 ma i out = 60 ma i out = 60 ma v in = v out v out(typ) output voltage vs. input voltage 0v in = v out v in (v) (50 mv/div) i out = 30 ma i out = 50 ma i out = 90 ma i out = 0 ma v out (25 mv/div) v out(typ) reverse bias current v rev (v) 0 300 500 0 10 20 100 200 400 v in = 0 v i rev (a) reverse bias current v rev (v) 0 300 500 0 10 20 100 200 400 v in = 0 v i rev (a) load regulation 0 50 100 i out (ma) v out (5 mv/div) v out(typ) load regulation 0 50 100 i out (ma) v out (5 mv/div) v out(typ)
page 22 october 1999 toko, inc. tk112xxb comparison between tk112xx and tk112xxb tk112xx tk112xxb line regulation 0 10 20 v in (v) v out (50 mv/div) v out(typ) line regulation 0 10 20 v in (v) v out (50 mv/div) v out(typ) quiescent current (off mode) vs. input voltage 020 v in (v) 0 i q (pa) 50 100 10 quiescent current (off mode) vs. input voltage 020 v in (v) 0 i q (pa) 50 100 10
october 1999 toko, inc. page 23 tk112xxb notes
page 24 october 1999 toko, inc. tk112xxb marking information product code p voltage code tk11213b 13 tk11214b 14 tk11215b 15 tk11216b 16 tk11217b 17 tk11218b 18 tk11219b 19 tk11220b 20 tk11221b 21 tk11222b 22 tk11223b 23 tk11224b 24 tk11225b 25 tk11226b 26 tk11227b 27 tk11228b 28 tk11229b 29 tk11230b 30 tk11231b 31 tk11232b 32 tk11233b 33 tk11234b 34 tk11235b 35 tk11236b 36 tk11237b 37 tk11238b 38 tk11239b 39 tk11240b 40 tk11241b 41 tk11242b 42 tk11243b 43 tk11244b 44 tk11245b 45 tk11246b 46 tk11247b 47 tk11248b 48 tk11249b 49 tk11250b 50 tk11255b 55 tk11280b 80 0.49 max 0.54 max 0.49 max 1.5 3.0 2.5 1.0 4.5 e e' 0.49 max 0.49 max 1.6 4.5 0.4 0.44 max 0.44 max +0.5 -0.3 64 3 2 1 1.5 0.7 max 1.0 0.7 max 1.5 0.7 0.8 0.7 1.5 2.0 1.5 recommended mount pad 45 1.5 1.5 e e e 5 product code 0.49 max voltage code lot number dimensions are shown in millimeters tolerance: x.x = 0.2 mm (unless otherwise specified) 1.0 note: pin 2 and pin 5 should be grounded for heat dissipation 0.95 0.95 0.32 e e m 0.1 (3.4) 1.2 0.15 0.3 3.3 2.2 0.4 0.95 0.95 3.0 e e e1 0.6 1.0 recommended mount pad 123 4 5 6 0 - 0.1 0.4 m 0.1 15 max 1.4 max marking +0.15 - 0.05 +0.15 - 0.05 + 0.3 dimensions are shown in millimeters tolerance: x.x = 0.2 mm (unless otherwise specified) voltage code product code 5 pl 3.5 +0.3 - 0.1 +0.15 - 0.05 sot-23l (sot-23l-6) package outline printed in the usa ? 1999 toko, inc. all rights reserved toko america regional offices toko america, inc. headquarters 1250 feehanville drive, mount prospect, illinois 60056 tel: (847) 297-0070 fax: (847) 699-7864 ic-215-tk112b 0798o0.0k visit our internet site at http://www.tokoam.com the information furnished by toko, inc. is believed to be accurate and reliable. however, toko reserves the right to make chan ges or improvements in the design, specification or manufacture of its products without further notice. toko does not assume any liability arising from the application or use of any product or circu it described herein, nor for any infringements of patents or other rights of third parties which may result from the use of its products. no license is granted by implication or otherwise under any paten t or patent rights of toko, inc. sot-89 (sot 89-5) western regional office toko america, inc. 2480 north first street , suite 260 san jose, ca 95131 tel: (408) 432-8281 fax: (408) 943-9790 midwest regional office toko america, inc. 1250 feehanville drive mount prospect, il 60056 tel: (847) 297-0070 fax: (847) 699-7864 eastern regional office toko america, inc. 107 mill plain road danbury, ct 06811 tel: (203) 748-6871 fax: (203) 797-1223 semiconductor technical support toko design center 4755 forge road colorado springs, co 80907 tel: (719) 528-2200 fax: (719) 528-2375

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