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january 22, 2002 toko, inc. page 1 tk740xxl block diagram tk740xxl dual low dropout voltage regulator features applications battery powered systems measurement systems mobile communications systems cellular phones cordless phones pdas toy motor drivers description 2 channel ldo in one package outputs can be set by external resistors high precision output voltage ( 2.0 % or 60 mv) independent active high on/off control for each ldo very low dropout voltage (v drop a = 90 mv at 100 ma, v drop b = 80 mv at 50 ma) stable with ceramic capacitors excellent ripple rejection ratio (84 db @ 400 hz) 1 a at shutdown peak output current is 370 ma sot23l-8 package wide operating voltage range (1.8 v ~ 14.5 v) reverse bias and overcurrent protection built-in thermal shutdown 8 gnd v in on/off control a v out a v out b f ba f bb on/off control b the tk740xx is a dual ultra low-drop-out regulator with a built-in electronic switch. the a-side delivers up to 200 ma output current and the b-side delivers up to 120 ma output current over the full temperature range. 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. external capacitors can be connected between the f ba and v outa and f bb and v outb pins to lower the output noise level. internal pnp pass transistors are used to achieve a low dropout voltage of 90 mv (typ.) at 100 ma load current side a and 80 mv (typ.) at 50 ma load current side b. the tk740xx has very low quiescent current. 45 a at no load and 0.4 ma with a 50 ma load. the internal thermal shut down circuitry limits the junction temperature to 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 tk740xx circuit features very high stability. an output capacitor of 0.22 f provides stable operation for v out 2.0 v. any type of capacitor can be used; however, the larger this capacitor is, the better the overall characteristics are. the ripple rejection ratio is 84 db at 400 hz, and 80 db at 1 khz. the tk740xx is available in the sot23l-8 surface mount package. gnd bandgap reference gnd bandgap reference f ba v in v out a v out b f bb on / off control a b thermal & over current protection r in = 300 k ? tk740 cl- ordering information package code package code: s: sot23l-8 voltage codes: refer to table 1 temp. code tape/reel code temp. code: c: -30 to 80c i: -40 to 85c tape/reel code: l: tape left reel size = 1300 pcs. b side voltage code a side voltage code
page 2 january 22, 2002 toko, inc. tk740xxl absolute maximum ratings - c rank supply voltage ............................................... -0.4 to16 v power dissipation .............................................. 600 mw reverse bias v oltage ................................... -0 .4 to 10 v operating voltage range ............................ 1.8 to 14.5 v storage temperature range ..................... -55 to +150 c operating temperature range ..................... -30 to +80 c noise bypass pin volt age .............................. -0.4 to 5 v control pin volt age ...................................... -0.4 to v op v short circuit current (a side) .............................. 430 ma short circuit current (b side) .............................. 330 ma tk740xx electrical characteristics - c rank test conditions: t a = 25 c, v in = v out(typ) + 1 v, i out = 1 ma 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 v t u o e g a t l o v t u p t u oi t u o a m 5 =1 e l b a t e e s g e r e n i ln o i t a l u g e r e n i l v ( v 5 = v n i v = ) p y t ( t u o v o t v 1 + ) p y t ( t u o ) v 6 + i t u o v a m 5 = n i v 8 1 = 0 . 00 . 5v m 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 5 45 7 a i y b t s t n e r r u c y b d n a t sv c c e d o m f f o v 0 1 =0 . 01 . 0 a v b f e g a t l o v . m r e t k c a b d e e f1 1 . 19 1 . 19 2 . 1v v t u o / t a 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 5 =0 7c / m p p ) 3 e t o n ( 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 u o e d o m n o , v 8 . 1 =8 . 15 a v t n o c e g a t l o v l o r t n o c n o t u p t u o8 . 1v f f o t u p t u o8 . 0v g e r d a o l) 1 e t o n ( n o i t a l u g e r d a o l i t u o a m 0 0 1 o t a m 5 =4 10 3v m i t u o a m 0 0 2 o t a m 5 =3 37 3v m v p o r d e g a t l o v t u o p o r d i t u o a m 0 0 1 =0 90 5 1v m i t u o a m 0 5 1 =5 2 10 8 1v m i t u o a m 0 0 2 =0 6 10 5 2v m i ) x a m ( t u o t n e r r u c t u p t u o m u m i x a mv t u o v = ) p y t ( t u o ) 2 e t o n ( 9 . 0 x0 9 20 8 3a m g e r d a o l) 1 e t o n ( n o i t a l u g e r d a o li t u o a m 0 0 1 o t a m 5 =7 10 4v m v p o r d e g a t l o v t u o p o r d i t u o a m 0 5 =0 85 2 1v m i t u o a m 0 0 1 =5 3 10 2 2v m i ) x a m ( t u o t n e r r u c t u p t u o m u m i x a mv t u o v = ) p y t ( t u o ) 2 e t o n ( 9 . 0 x0 9 10 8 2a m c o m m o n s i d e a s i d e b
january 22, 2002 toko, inc. page 3 tk740xxl tk740xx electrical characteristics - c rank (cont.) test conditions: t a = 25 c, v in = v out(typ) + 1 v, i out = 1 ma note 1: this value depends on the output voltage. this is a reference value for a 3v output device. the details of each device are desc ribed in the individual specifications. note 2: the output current is limited by the power dissipation of the total of both sides. note 3: pull down resistor for control terminal is not built in. general note: parameters with only typical values are just reference. (not guaranteed) general note: limits are guaranteed by production testing or correction techniques using statistical quality control (sqc) met hods. unless otherwise noted. v in = v out(typ) + 1v; i out = 1 ma (tj = 25c) the operation of -30 to 80c is guaranteed in the design by a usual inspection. general note: exceeding the ?absolute maximum rating? may damage the device. 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 r rn o i t c e j e r e l p p i r 0 . 1 = l c , z h 0 0 4 = f c , f n 1 0 . 0 = , f v e s i o n v m 0 0 2 = s m r v , n i v = ) p y t ( t u o + i , v 5 . 1 t u o a m 0 1 = 4 8b d 0 . 1 = l c , z h k 1 = f c , f n 1 0 . 0 = , f v e s i o n v m 0 0 2 = s m r v , n i v = ) p y t ( t u o + i , v 5 . 1 t u o a m 0 1 = 0 8b d
page 4 january 22, 2002 toko, inc. tk740xxl absolute maximum ratings - i rank tk740xx electrical characteristics - i rank test conditions: t a = 25 c, bold typeface applies over the -40c to 85c ambient temperature range. operational voltage range is (2.1 v v op 14 v). unless otherwise noted. v in = v out(typ) + 1 v, i out = 1 ma 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 m p y t x a ms t i n u v t u o e g a t l o v t u p t u oi t u o a m 5 =2 e l b a t e e s g e r e n i ln o i t a l u g e r e n i l v ( v 5 = v n i v = ) p y t ( t u o v o t v 1 + ) p y t ( t u o ) v 6 + i t u o v a m 5 = n i v 8 1 = 0 . 00 . 5 0 . 7 v m 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 5 45 7 5 9 a i y b t s t n e r r u c y b d n a t sv c c e d o m f f o v 0 1 = 0 . 01 . 0 3 a v b f e g a t l o v . m r e t k c a b d e e f1 1 . 1 9 1 . 10 3 . 1 v v t u o / t a 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 5 =0 7c / m p p ) 3 e t o n ( 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 u o e d o m n o v 8 . 1 = 8 . 15 7 a v t n o c e g a t l o v l o r t n o c n o t u p t u o 8 . 1 0 . 2 v f f o t u p t u o 8 . 0 6 . 0 v g e r d a o l) 1 e t o n ( n o i t a l u g e r d a o l i t u o a m 0 0 1 o t a m 5 = 4 10 3 9 3 v m i t u o a m 0 0 2 o t a m 5 = 3 30 7 0 9 v m v p o r d e g a t l o v t u o p o r d i t u o a m 0 0 1 = 0 90 5 1 0 8 1 v m i t u o a m 0 5 1 = 5 2 10 8 1 0 3 2 v m i t u o a m 0 0 2 = 0 6 10 5 2 0 0 3 v m i ) x a m ( t u o t n e r r u c t u p t u o m u m i x a mv t u o v = ) p y t ( t u o ) 2 e t o n ( 9 . 0 x 0 9 2 0 5 2 0 8 3 a m c o m m o n s i d e a supply voltage ............................................... -0.4 to16 v power dissipation .............................................. 600 mw reverse bias v oltage ................................... -0 .4 to 10 v operating voltage range ............................... 2.1 to 14 v storage temperature range ..................... -55 to +150 c operating temperature range ..................... -40 to +85 c noise bypass pin volt age .............................. -0.4 to 5 v control pin volt age ...................................... -0.4 to v op v short circuit current (a side) .............................. 430 ma short circuit current (b side) .............................. 330 ma
january 22, 2002 toko, inc. page 5 tk740xxl tk740xx electrical characteristics (i rank) (cont.) test conditions: t a = 25 c, bold typeface applies over the -40c to 85c ambient temperature range. operational voltage range is (2.1 v v op 14 v). unless otherwise noted. v in = v out(typ) + 1 v, i out = 1 ma 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 g e r d a o l) 1 e t o n ( n o i t a l u g e r d a o li t u o a m 0 0 1 o t a m 5 = 7 10 4 0 5 v m v p o r d e g a t l o v t u o p o r d i t u o a m 0 5 = 0 85 2 1 5 7 1 v m i t u o a m 0 0 1 = 5 3 10 2 2 0 8 2 v m i ) x a m ( t u o t n e r r u c t u p t u o m u m i x a mv t u o v = ) p y t ( t u o ) 2 e t o n ( 9 . 0 x 0 9 1 0 5 1 0 8 3 a m r rn o i t c e j e r e l p p i r 0 . 1 = l c , z h 0 0 4 = f c , f n 1 0 . 0 = v , f e s i o n v m 0 0 2 = s m r v , n i = v ) p y t ( t u o i , v 5 . 1 + t u o a m 0 1 = 4 8 b d 0 . 1 = l c , z h k 1 = f c , f n 1 0 . 0 = v , f e s i o n v m 0 0 2 = s m r v , n i = v ) p y t ( t u o i , v 5 . 1 + t u o a m 0 1 = 0 8 b d s i d e b note 1: this value depends on the output voltage. this is a reference value for a 3v output device. the details of each device are desc ribed in the individual specifications. note 2: the output current is limited by the power dissipation of the total of both sides. note 3: pull down resistor for control terminal is not built in. general note: parameters with only typical values are just reference. (not guaranteed) general note: limits are guaranteed by production testing or correction techniques using statistical quality control (sqc) met hods. unless otherwise noted. v in = v out(typ) + 1v; i out = 1 ma (tj = 25c) the operation of -40 to 85c is guaranteed in the design by a usual inspection. general note: exceeding the ?absolute maximum rating? may damage the device.
page 6 january 22, 2002 toko, inc. tk740xxl tk740xx electrical characteristics table 1 test conditions: v in = v out(typ) + 1 v, i out = 5 ma, t a = 25 c, unless otherwise specified. . c e p s . e g n a r . p m e t d e d n e t x e . c e p s e g n a r . p m e t d r a d n a t s t ( p m e t m o o r a t ( p m e t l l u f ) c 5 2 = a ) c 5 8 o t 0 4 - = y t i l i b a l i a v a t u p t u o e g a t l o v e g a t l o v e d o c v t u o n i mv t u o x a mv t u o n i mv t u o x a m v 3 . 13 1v 0 4 2 . 1v 0 6 3 . 1 v 4 . 14 1v 0 4 3 . 1v 0 6 4 . 1 * v 5 . 15 1v 0 4 4 . 1v 0 6 5 . 1 v 6 . 16 1v 0 4 5 . 1v 0 6 6 . 1 v 7 . 17 1v 0 4 6 . 1v 0 6 7 . 1 * v 8 . 18 1v 0 4 7 . 1v 0 6 8 . 1v 0 2 7 . 1v 0 8 8 . 1 * v 9 . 19 1v 0 4 8 . 1v 0 6 9 . 1 * v 0 . 20 2v 0 4 9 . 1v 0 6 0 . 2v 0 2 9 . 1v 0 8 0 . 2 v 1 . 21 2v 0 4 0 . 2v 0 6 1 . 2v 0 2 0 . 2v 0 8 1 . 2 * v 2 . 22 2v 0 4 1 . 2v 0 6 2 . 2v 0 2 1 . 2v 0 8 2 . 2 v 3 . 23 2v 0 4 2 . 2v 0 6 3 . 2v 0 2 2 . 2v 0 8 3 . 2 v 4 . 24 2v 0 4 3 . 2v 0 6 4 . 2v 0 2 3 . 2v 0 8 4 . 2 * v 5 . 25 2v 0 4 4 . 2v 0 6 5 . 2v 0 2 4 . 2v 0 8 5 . 2 v 6 . 26 2v 0 4 5 . 2v 0 6 6 . 2v 0 2 5 . 2v 0 8 6 . 2 * v 7 . 27 2v 0 4 6 . 2v 0 6 7 . 2v 0 2 6 . 2v 0 8 7 . 2 * v 8 . 28 2v 0 4 7 . 2v 0 6 8 . 2v 0 2 7 . 2v 0 8 8 . 2 * v 9 . 29 2v 0 4 8 . 2v 0 6 9 . 2v 0 2 8 . 2v 0 8 9 . 2 * v 0 . 30 3v 0 4 9 . 2v 0 6 0 . 3v 0 2 9 . 2v 0 8 0 . 3 * v 1 . 31 3v 8 3 0 . 3v 2 6 1 . 3v 0 2 0 . 3v 0 8 1 . 3 * v 2 . 32 3v 6 3 1 . 3v 4 6 2 . 3v 0 2 1 . 3v 0 8 2 . 3
january 22, 2002 toko, inc. page 7 tk740xxl . c e p s . e g n a r . p m e t d e d n e t x e . c e p s e g n a r . p m e t d r a d n a t s t ( p m e t m o o r a t ( p m e t l l u f ) c 5 2 = a ) c 5 8 o t 0 4 - = y t i l i b a l i a v a t u p t u o e g a t l o v e g a t l o v e d o c v t u o n i mv t u o x a mv t u o n i mv t u o x a m * v 3 . 33 3v 4 3 2 . 3v 6 6 3 . 3v 0 2 2 . 3v 0 8 3 . 3 v 4 . 34 3v 2 3 2 . 3v 8 6 4 . 3v 0 2 3 . 3v 0 8 4 . 3 * v 5 . 35 3v 0 3 4 . 30 7 5 . 3v 0 2 4 . 3v 0 8 5 . 3 * v 6 . 36 3v 8 2 5 . 3v 2 7 6 . 3v 0 2 5 . 3v 0 8 6 . 3 v 7 . 37 3v 6 2 6 . 3v 4 7 7 . 3v 0 2 6 . 3v 0 8 7 . 3 * v 8 . 38 3v 4 2 7 . 3v 6 7 8 . 3v 0 2 7 . 3v 0 8 8 . 3 v 9 . 39 3v 2 2 8 . 3v 8 7 9 . 3v 0 2 8 . 3v 0 8 9 . 3 * v 0 . 40 4v 0 2 9 . 3v 0 8 0 . 4v 0 1 9 . 3v 0 9 0 . 4 v 1 . 41 4v 8 1 0 . 4v 2 8 1 . 4v 9 0 0 . 4v 1 9 1 . 4 v 2 . 42 4v 6 1 1 . 4v 4 8 2 . 4v 8 0 1 . 4v 2 9 2 . 4 v 3 . 43 4v 4 1 2 . 4v 6 8 3 . 4v 7 9 1 . 4v 3 9 3 . 4 v 4 . 44 4v 2 1 3 . 4v 8 8 4 . 4v 6 0 3 . 4v 4 9 4 . 4 * v 5 . 45 4v 0 1 4 . 4v 0 9 5 . 4v 5 0 4 . 4v 5 9 5 . 4 v 6 . 46 4v 8 0 5 . 4v 2 9 6 . 4v 4 0 5 . 4v 6 9 6 . 4 * v 7 . 47 4v 6 0 6 . 4v 4 9 7 . 4v 6 0 6 . 4v 7 9 7 . 4 v 8 . 48 4v 4 0 7 . 4v 6 9 8 . 4v 2 0 7 . 4v 8 9 8 . 4 v 9 . 49 4v 2 0 8 . 4v 8 9 9 . 4v 1 0 8 . 4v 9 9 9 . 4 * v 0 . 50 5v 0 0 9 . 4v 0 0 1 . 5v 0 0 9 . 4v 0 0 1 . 5 tk740xx electrical characteristics table 1 (cont) test conditions: v in = v out(typ) + 1 v, i out = 5 ma, t a = 25 c, unless otherwise specified.
page 8 january 22, 2002 toko, inc. tk740xxl test circuit typical performance characteristics a and b: common characteristics gnd v in cont a 0.01 f cont b 4 8 v out b v out a cl b 0.1 f cl a 0.1 f i stby (a) v cc (v) 0 10 20 1e-6 1e-7 1e-8 standby current vs. v in (off mode) 1e-9 1e-10 v out(typ) v in (v) 0 10 20 line regulation 1 mv/div i cont ( a) v cont (v) 0 5.0 10 control current vs. control voltage i out = 0 ma 0 25 50 i cont v out i cont ( a) t a (c) -50 0 50 100 control current vs. temperature 0 2 5 1 3 4 v cont = 1.8 v v cont (v) t a (c) -50 0 50 100 control voltage (v out? on/off point) vs. temperature 0 2 1 off on i q (ma) v in (v) 0 10 20 3.0 2.0 1.0 quiescent current vs. v in (on mode) i out = 0 ma 0 v out = 3 v v out = 4 v v out = 5 v
january 22, 2002 toko, inc. page 9 tk740xxl typical performance characteristics (cont) side a side b v out (v) i out (ma) 0 100 200 300 400 500 short circuit current a 0.0 3.5 2.0 1.0 1.5 2.5 3.0 0.5 v out (v) i out (ma) 0 100 200 300 400 500 short circuit current b 0.0 3.5 2.0 1.0 1.5 2.5 3.0 0.5 v out (v) i out (ma) 0 50 100 150 200 load regulation a 2.90 3.04 2.98 2.94 2.96 3.00 3.02 2.92 v out (v) i out (ma) 0 50 100 150 200 load regulation b 2.90 3.04 2.98 2.94 2.96 3.00 3.02 2.92 v out (typ) v in vs. v out a v in (100 mv/div) i out = 0, 50, 100, 150, 200, 250 (ma) in 50 ma steps i out = 250 ma i out = 0 ma v in = v out v out (25mv/div) v in vs. v out b i out = 0, 50, 100, 150, 200 (ma) in 50 ma steps i out = 200 ma i out = 0 ma v out (typ) v in (100 mv/div) v in = v out v out (25mv/div)
page 10 january 22, 2002 toko, inc. tk740xxl typical performance characteristics (cont) side a side b v drop (v) i out (ma) 0 50 100 150 200 dropout voltage a -0.20 0 -0.10 -0.15 -0.05 v drop (v) i out (ma) 0 50 100 150 200 dropout voltage b -0.20 0 -0.10 -0.15 -0.05 i gnd (ma) i out (ma) 0 100 200 6 4 2 ground pin current vs. output current a 0 8 10 i gnd (ma) i out (ma) 0 100 200 6 4 2 ground pin current vs. output current b 0 8 10
january 22, 2002 toko, inc. page 11 tk740xxl side a side b typical performance characteristics (cont) ambient temperature behavior i gnd (ma) t a (c) -40 -20 0 20 40 60 80 100 6 4 2 ground pin current vs. temperature 0 8 10 9 7 5 3 1 i out = 100 ma v drop (mv) t a (c) -40 -20 0 20 40 60 80 100 200 dropout voltage vs. temperature 0 250 300 150 100 50 i out = 200 ma i out = 100 ma v drop (mv) t a (c) -40 -20 0 20 40 60 80 100 200 dropout voltage vs. temperature 0 250 300 150 100 50 i out = 100 ma i out = 50 ma i out (ma) t a (c) -40 -20 0 20 40 60 80 100 300 200 100 maximum output current vs. temperature 0 400 500 t a (c) -40 -20 0 20 40 60 80 100 300 200 100 maximum output current vs. temperature 0 400 500 i out (ma) i gnd (ma) t a (c) -40 -20 0 20 40 60 80 100 6 4 2 ground pin current vs. temperature 0 8 10 9 7 5 3 1 i out = 200 ma i out = 100 ma
page 12 january 22, 2002 toko, inc. tk740xxl typical performance characteristics (cont) output voltage temperature behavior v out t a (c) -40 -20 0 20 40 60 80 100 3.990 3.980 3.970 tk74040m 3.960 4.000 4.010 4.005 3.995 3.985 3.975 3.965 v out t a (c) -40 -20 0 20 40 60 80 100 4.990 4.980 4.970 tk74050m 4.960 5.000 5.010 5.005 4.995 4.985 4.975 4.965 v out t a (c) -40 -20 0 20 40 60 80 100 1.990 1.980 1.970 tk74020m 1.960 5.000 2.010 2.005 1.995 1.985 1.975 1.965 v out t a (c) -40 -20 0 20 40 60 80 100 1.800 1.790 1.780 tk74018m 1.770 1.810 1.820 1.815 1.805 1.795 1.785 1.775 v out t a (c) -40 -20 0 20 40 60 80 100 2.890 2.880 2.870 tk74028m 2.860 2.800 2.810 2.805 2.895 2.885 2.875 2.865 v out t a (c) -40 -20 0 20 40 60 80 100 2.990 2.980 2.970 tk74030m 2.960 3.000 3.010 3.005 2.995 2.985 2.975 2.965
january 22, 2002 toko, inc. page 13 tk740xxl typical performance characteristics (cont.) ripple rejection (tk74030m) conditions: v in = 4.0 v v ripple = 500 mvp-p c in = 0 f i out = 10 ma c out = 1.0 f (mlcc) c fb = 4700 pf the ripple rejection characteristic improves by enlarging the capacitor on the output side. the characteristic of the high frequency area is decided by the characteristic of the output side capacitor. with c fb cl = 1.0 f(mlcc) c fb =0 c fb = 4700 pf 0.1 1 10 100 1000 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 r r ( d b ) frequency(khz) cl = 0.1 f (mlcc) cl = 1.0 f (mlcc) 0.1 1 10 100 1000 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 rr(db) frequency(khz) cl = 0.1 f (mlcc) cl = 1.0 f (tantalum) 0.1 1 10 100 1000 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 rr(db) frequency(khz) c fb 4700 pf cl v in v out v cont gnd 740xx gnd 200 mvp-p input wave form v in
page 14 january 22, 2002 toko, inc. tk740xxl without c fb typical performance characteristics (cont.) ripple rejection when i/o voltage difference is few when the difference between the input voltage and the output voltage decreases, the ripple rejection characteristic is different in side a and side b. the characteristic on the a side (where the power transistor is large) improves. db v in = v out +0.2 v +0.4 v +0.6 v -40 -60 -80 ripple rejection vs. v in (side a) -100 -20 0 -10 -30 -50 -70 -90 10 khz, 100 ma 1 khz, 100 ma 10 khz, 10 ma 1 khz, 10 ma cl = 0.22 f c fb = 4700 pf db v in = v out +0.2 v +0.4 v +0.6 v -40 -60 -80 ripple rejection vs. v in (side b) -100 -20 0 -10 -30 -50 -70 -90 10 khz, 100 ma 1 khz, 100 ma 10 khz, 10 ma 1 khz, 10 ma cl = 0.22 f c fb = 4700 pf db v in = v out +0.2 v +0.4 v +0.6 v -40 -60 -80 ripple rejection vs. v in (side a) -100 -20 0 -10 -30 -50 -70 -90 10 khz, 100 ma 1 khz, 100 ma 10 khz, 10 ma 1 khz, 10 ma cl = 0.22 f c fb = none db v in = v out +0.2 v +0.4 v +0.6 v -40 -60 -80 ripple rejection vs. v in (side b) -100 -20 0 -10 -30 -50 -70 -90 10 khz, 100 ma 1 khz, 100 ma 10 khz, 10 ma 1 khz, 10 ma cl = 0.22 f c fb = none c fb 0 pf cl v in v out v cont gnd 740xx gnd 200 mvp-p input wave form v in
january 22, 2002 toko, inc. page 15 tk740xxl typical performance characteristics (cont.) output noise the noise in the low current region decreases when a tantalum capacitor is used. as for the output side capacitor, a tantalum capacitor of 0.1 f is recommended. the characteristic of the capacitor greatly influences the amount of the noise. noise ( v rms ) i out (ma) 0 50 100 150 200 250 150 noise density vs. i out (tk74030m) 0 300 400 350 200 100 50 ? ? ? ? ? ? ? ? ? ? ? ? ch a 1.0 f (mlcc) ch b 1.0 f (mlcc) ch a 1.0 f (tantalum) ch b 1.0 f (tantalum) conditions v in = 4.0 v c in = 0.1 f (tanalum) c fb = 4700 pf (ceramic) noise ( v rms ) cl( f) 0.1 1 10 250 150 noise density vs. cl (tk74030m) 0 300 400 350 200 100 50 ? ? ? ? ? ? ? ? conditions v in =4.0v c in =0.1 f (tanalum) i out =200ma(ch a) i out =100ma(ch b) ? ? ? ? ch a c fb =0 ch b c fb =472 ch a c fb =0 ch b c fb =472
page 16 january 22, 2002 toko, inc. tk740xxl typical performance characteristics (cont.) line transient v in = 4 v to 5 v to 4 v, c in = 1.0 f(mlcc), c fb = 4700 pf v in v outa v outa v outa v in v outa v outa v outa v in v outb v outb v outb v in v outb v outb v outb a side (i out = 100 ma) b side (i out = 50 ma) 10 mv/div 25 s/div 10 mv/div 25 s/div 10 mv/div 25 s/div 10 mv/div 25 s/div cl = 0.47 f (mlcc) cl = 1.0 f (mlcc) cl = 3.3 f (mlcc) cl = 0.47 f (mlcc) cl = 1.0 f (mlcc) cl = 3.3 f (mlcc) cl = 0.47 f (mlcc) cl = 1.0 f (mlcc) cl = 3.3 f (mlcc) cl = 0.47 f (mlcc) cl = 1.0 f (mlcc) cl = 3.3 f (mlcc)
january 22, 2002 toko, inc. page 17 tk740xxl typical performance characteristics (cont.) load transient v in = 4 v, c in = 1.0 f(mlcc) a side (i out ) = 5 - 100 - 5 ma) b side (i out ) = 5 - 50 - 5 ma) f cfb=472 c fb = 4700 pf c fb = 4700 pf c fb = 4700 pf c fb = 4700 pf cl = 1.0 f(tantalum) cl = 1.0 f(tantalum) v outa v outb i out i out 5 to 100 to 5 ma step c fb = 0 c fb = 4700 pf 5 to 50 to 5 ma step c fb = 0 c fb = 4700 pf v outa v outb v outa i out 5 to 100 to 5 ma step v outa v outa cl = 0.47 f(mlcc) cl = 1.0 f(mlcc) cl = 3.3 f(mlcc) cl = 0.47 f(mlcc) cl = 1.0 f(mlcc) cl = 3.3 f(mlcc) v outb i out v outb v outb 5 to 100 to 5 ma step cl = 0.47 f(mlcc) cl = 1.0 f(mlcc) cl = 3.3 f(mlcc) v outb i out v outb v outb v outa i out 5 to 100 to 5 ma step v outa v outa cl = 0.47 f(mlcc) cl = 1.0 f(mlcc) cl = 3.3 f(mlcc) 5 to 50 to 5 ma step 200 mv/div 25 s/div 200 mv/div 250 s/div 200 mv/div 250 s/div 200 mv/div 50 s/div 500 mv/div 50 s/div 200 mv/div 25 s/div
page 18 january 22, 2002 toko, inc. tk740xxl typical performance characteristics (cont.) on / off transient i out = 10 ma, c in = 0.11 f(mlcc), cl = 1.0 f (mlcc) the difference by c fb is negligible the difference by c fb is neligible v cont v out v cont v out v cont v out v cont v out v cont v out v cont v out v out v out v out v out v out v out c fb = 0 c fb = 100 pf 200 mv/div 50 s/div c fb = 0 c fb = 100 pf c fb =4700 pf 200 mv/div 1 ms/div c fb =3300 pf c fb = 1000 pf c fb =4700 pf 200 mv/div 1 ms/div c fb =3300 pf c fb = 1000 pf 2 v/div 2 v/div 2 v/div 2 v/div 2 v/div 200 mv/div 100 s/div 2 v/div 200 mv/div 100 s/div a side b side 200 mv/div 25 s/div
january 22, 2002 toko, inc. page 19 tk740xxl typical performance characteristics (cont.) cross regulation c in = 0.1 f cl = 1.0 f(mlcc) c fb = none the following graphs show the effect on both output voltages when rapidly changing the load current on only one side (a side or b side in 5-50 , 5-100, 5-200 ma steps). the current on the side where the load current is not allowed to change is 5 ma constant. the measurement sensitivity on the side without the current change is 5 mv/div: the side with the current change is 200 mv/div. a b a b a b a b a b time (250 s) v outa v outb a: = 5 ma(const) b: 5 to 50 ma step a: = 5 ma(const) b: 5 to 100 ma step a: = 5 to 50 ma step b: 5 ma(const) a: = 5 to 100 ma step b: 5 ma(const) a: = 5 to 200 ma step b: 5 ma(const) i outb 200 mv/div 250 s/div i out = 200 to 5 ma step i out = 100 to 5 ma step i out = 50 to 5 ma step 5 mv/div 250 s/div 200 mv/div 250 s/div 5 mv/div 250 s/div v outa v outb i outa v outa v outb i outa v outa v outb i outa v outa v outb 200 mv/div 250 s/div 5 mv/div 250 s/div 200 mv/div 250 s/div 5 mv/div 250 s/div 5 mv/div 250 s/div i out = 50 to 5 ma step i out = 100 to 5 ma step i outb 200 mv/div 250 s/div
page 20 january 22, 2002 toko, inc. tk740xxl 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 = 5 ma. maximum output current (i out(max) ) the rated output current is specified under the condition where the output voltage drops to v out(typ) x 0.9. the input voltage is set to v out(typ) +1 v, and the current is pulsed to minimize temperature effect. the output current decreases during low voltage operation. 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 (this is the point when the output voltage decreases by 100 mv). below this value, the output voltage will fall as the input voltage is reduced. it is dependent upon the load current and the junction tempera- ture. 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 + 1 v to v in = v out + 6 v. it is a pulsed measurement to minimize temperature effects. 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 5 ma to 100 ma and 5 ma to 200 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 pin current(i gnd ) the ground pin current is the current which flows through the gnd terminal according to load current. it is measured by (input current-output current). 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 500 mv rms , 100 hz and 1 mhz signal superimposed on the input voltage, where v in = v out + 1.5 v. the output decoupling capacitor is set to 1.0 f, the c fb capacitor is set to 4700 pf, and the load current is set to 10 ma. ripple rejection is the ratio of the ripple content of the output vs. the input and is expressed in db. ripple rejection can be improved by increasing the c fb capacitor (however, the on/off response time will increase). standby current (i stby ) standby current is the current into the regulator when the output is turned off by the control function. it is measured with an input voltage of 8 v. over current sensor the overcurrent sensor protects the device when there is excessive output current. it also protects the device if the output is accidentally shorted to ground. thermal sensor the thermal sensor protects the device if the junction temperature exceeds the safe value (t j = 150 c). this temperature rise can be caused by extreme heat, excessive power dissipation caused by large output voltage drops, or excessive output current. the regulator will shut off when the temperature exceeds the safe value. as the junction temperature decreases, 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. 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. toko?s regulators do not need an inherent diode connected between the input and output. the maximum reverse bias boltage is 6 v. tk740xx v out v in gnd
january 22, 2002 toko, inc. page 21 tk740xxl definition and explanation of technical terms (cont.) 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 tempera- ture rise is greatly affected by the mounting pad configura- tion 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 large. when mounted on the recom- mended mounting pad, the power dissipation of the sot23l-8 is increased to 600 mw. for operation at ambient temperatures over 25 c, the power dissipation of the sot23l-8 device should be derated at 4.8 mw/ 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 con- ductivity 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 0 ja = 125 c / p d (c / mw) p d is the value when the thermal protection circuit is activated. a simple way to determine p d is to calculate v in x i in when 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 ) pd 25 50 75 150 t a (c) 3 p d (mw) 5 0 100 2 4
page 22 january 22, 2002 toko, inc. tk740xxl application information standard application typically, give the capacitor as large a value as practical in consideration of the temperature characteristic. the output noise and ripple noise decrease with a larger capacitance value. in addition, the response to the output side load change also improves. output voltage change the output voltage on both sides can be set by using r1 and r2. the output voltage is deteremed by the ratio of r1 and r2. the error of the output voltage usually grows because of the tolerance of the external parts. noise reduction (improvement of ripple rejection ratio) please connect c fb with the f ba terminals (1 and 2) and f bb terminals (3 and 4). it is possible to use c fb only on the needed side. a tantalum capacitor is the best in this application. a small capacitance is sufficient (0.1 f, 0.22 f, etc.). when the ceramic capacitor is used, the noise grows in the low current region. if 1.0 ? . (r s 1) is connected in series with the ceramic capacitor, the same characteristics as a tantalum capacitor can be obtained. please adjust the output side capacitor to the value in which stable operation is done over all required temperature ranges. damage will not be caused by enlarging this value. increasing this value will decrease the ripple noise and improve the output load transient response. however, the risetime using the on/off control becomes slower. it is possible to use the noise reduction application with output voltage change application above. gnd v in cont a 0.01 f cont b 4 8 v out b v out a cl b 0.1 f (1.0 f) cl a 0.1 f ( 1.0 f ) gnd v in cont a 0.01 f cont b 4 8 v out b v out a c fb = 4700 pf cl b 1.0 f c fb cl * * f: any capacitor can be used cl a 1.0 f 4700 pf is recommended for c fb gnd v in cont a 0.01 f cont b 4 8 v out b v out a cl a 0.22 f (1.0 f) cl b 0.1 f ( 1.0 f ) r2? r1? r2 r1 r1(k ? ) = (vout 1.19 - 1) x r2 v out = (r1 r2 + 1) x 1.19 22 k r2 i out = 50 to 200 ma tk74028 noise level vs. c fb (a = b) 200 100 noise( v) 0 1 10 100 1k 10k 100k c fb (pf) cl= 1.0 f tantalum cl= 1.0 f mlcc
january 22, 2002 toko, inc. page 23 tk740xxl application information (cont.) sot23l-8 board layout board layout 1 4 5 8 v out b v out a on/off b on/off a gnd v in gnd 600 0 25 50 (85) 150 -4.8 mw / c pd(mw) 0 100 mounted as shown free air t a (c)
page 24 january 22, 2002 toko, inc. tk740xxl input-output capacitors linear regulators require input and output capacitors in order to maintain the regulator?s loop stability. the equivalent serie s 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 circuit 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 of 0.1 f (v out 1.8 v). if the capacitor is 0.1 f or more over its full range of temperature, either a ceramic capacitor or tantalum capacitor can be used without considering esr (v out 1.8 v). application information (cont.) the recommended value of c l 0.1 f for i out 0.5 ma. for load current 0.5 ma, increase the output capacitor to 1 f. 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. please increase the output capacitor value when the load current is 0.5 ma or less. the stability of the regulator improves if a big output side capacitor is used (the stable operation area extends). for evaluation kyocera cm05b104k10ab, cm05b224k10ab, cm105b104k16a, cm105b224k16a, cm21b225k10a murata grm36b104k10, grm42b104k10, grm39b104k25, grm39b224k10, grm39b105k6.3 100 10 1 0.1 0 .01 esr ( ? ) 100 10 1 0.1 0 .01 esr ( ? ) 100 10 1 0.1 0 .01 esr ( ? ) 100 10 1 0.1 0 .01 esr ( ? ) 100 10 1 0.1 0 .01 esr ( ? ) 0 50 100 150 i out (ma) all stable cl 1.0 f 0 50 100 150 i out (ma) 0 50 100 150 i out (ma) 0 50 100 150 i out (ma) i out (ma) 0 50 100 150 stable area cl = 0.1 f stable area cl = 0.1 f stable area cl = 0.1 f stable area cl = 0.1 f stable area cl = 0.1 f v out = 1.5 v - 1.9 v v out = 2.0 v v out = 3.0 v v out = 4.0 v v out = 5.0 v all stable all stable all stable all stable cl = 0.22 f ~ 0.1 f v out c in = 0.22 f ~ 0.1 f tk740xx v in
january 22, 2002 toko, inc. page 25 tk740xxl bias voltage and temperature characteristics of ceramic capacitors generally, a ceramic capacitor has both a temperature characteristic and a voltage characteristic. please consider both characteristics when selecting the part. the b curves are the recommended characteristics. application information (cont.) bi as v ol t age ( v ) 0 2 4 6 8 10 100 90 80 70 capaci t an ce vs. bi as vo lt age 60 50 40 f cu rve b curve capaci tance (%) t a (c) -50 - 25 0 25 50 75 100 100 90 80 70 capaci tance vs. tem perature 60 50 f cu rve b curve capaci tance (%)
page 26 january 22, 2002 toko, inc. tk740xxl application information (cont.) super-low i/o voltage difference and high current ldo connect the following terminals; pin 5 and pin 8, pin 1 and pin 4, pin 2 and pin 3. v drop = 70 mv at 100 ma; 125 mv at 200 ma; 180 mv at 300 ma is typically obtained. attention when this application is adopted the control current and the no load current double because the a and b circuits are connected in parallel. a very large current flows at the output during a short-circuit. therefore, there is a possibility of damage by the current. please note the short- circuit of the output side and gnd. the current value that can regularly be delivered is 300-400 ma. the output current is limited by the permissible electric power loss of the package. the current cannot be delivered exceeding this. however, a large peak current can be delivered for the pulse load with little generation of heat. the permissible loss increases by improving heat radiation. please make the copper pattern in the ic part installation as wide as possible. for instance, the permissible electric power loss increases greatly if the board thermal plan is bonded to the ic. the characteristic of this application is not guaranteed immediately because toko does not test to this application. the characteristic of this application is almost obtained by guaranteeing the characteristic on the a side and the b side. the difference appears large; use care when designing. v out 8 gnd v in v cont cl 1 0.22 f f b a f b b 6 -100 dropout voltage a + b -50 0 -150 -200 -250 0 100 200 v drop (mv) i out (ma) a b a+b 6 8 10 4 2 0 0 100 200 i out (ma) i gnd vs. i out a + b i gnd (ma) load regulation 0 100 200 300 400 i out (ma) v out (10 mv/div 3 short circuit current 4 5 2 1 0 0 500 1000 i out (ma) v out (typ) v out (v)
january 22, 2002 toko, inc. page 27 tk740xxl improvement of load regulation with high current application please connect a resistor (max = 1.2 - 1.6 ) between pin 6 of the tk740xx and gnd. the load regulation is greatly improved. please increase the i/o capacitors. application information (cont.) v out 8 gnd v in v cont cl 1 0.22 f f b a f b b 6 r g i out (ma) 0 100 200 300 400 load regulat i on v out (typ) v out (10mv/ div) r g = 1.60 v out
page 28 january 22, 2002 toko, inc. tk740xxl application information (cont.) variable output voltage. output voltage controled by an external voltage (power supply, dac, tec.). when v adj is raised more than 1.25v, the correspoinding output voltage falls. because the two sides operate independently, one side only can be used, if desired. forward or reverse: motor drive circuit. the direction of the direct current motor rotation changes with the direction of the current. a bridge circuit can be made with the tk740xx and an external transistor. each element of the bridge circuit is controlled by an external signal. on/off control of the bridge elements is accomplished and the desired voltage polarity for the motor is selected. the speed changes in accordance with the amount of current (voltage) which flows through the motor. the tk740xx has both the switch function and the variable output voltage function. the motor rotation speed can be controlled by changing the output voltage. the speed and direction of the motor can be controlled by combining the two functions above. the i/o voltage difference of tk740xx is approximately 0.17 v at i out = 150 ma. the current when the motor starts is 300 ma max. constant speed (fixed voltage) even if the input voltage changes, the voltage impressed to the motor is constant. variable speed (variable voltage) when v adj is raised more than 1.25 v, the output voltage falls. v adj v out b 8 gnd v in 6 r = 100 k ? v ou ta cont b cont a tk740xx v outb 8 tk740xx gnd v in cl = 0.1 f v outa cont (f) m cont (r) v outb 8 tk740xx gnd v in c fb = 0.0047 f v outa cont (f) m v adj cont (r)
january 22, 2002 toko, inc. page 29 tk740xxl marking information product code a part number voltage code tk74013 13 tk74014 14 tk74015 15 tk74016 16 tk74017 17 tk74018 18 tk74019 19 tk74020 20 tk74021 21 tk74022 22 tk74023 23 tk74024 24 tk74025 25 tk74026 26 tk74027 27 tk74028 28 tk74029 29 tk74030 30 tk74031 31 tk74032 32 tk74033 33 tk74034 34 tk74035 35 tk74036 36 tk74037 37 tk74038 38 tk74039 39 tk74040 40 tk74041 41 tk74042 42 tk74043 43 tk74044 44 tk74045 45 tk74046 46 tk74047 47 tk74048 48 tk74049 49 tk74050 50 sot23l-8 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-264-tk740xx 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 chang es 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 circuit descri bed 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 patent or patent rights of tok o, inc. toko?s products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of toko, incorporated. midwest regional office toko america, inc. 1250 feehanville drive mount prospect, il 60056 tel: (847) 297-0070 fax: (847) 699-7864 semiconductor technical support toko design center 4755 forge road colorado springs, co 80907 tel: (719) 528-2200 fax: (719) 528-2375 5 1 4 8 0.8 0.8 3.3 0.4 2.2 ( 0 . 3 ) 1 . 2 0 . 1 5 0.3 1 . 0 3 . 0 e 1 recommended mount pad 0 - 0 . 1 1 5 m a x e 0.1 m 0.1 0.45 1 . 4 m a x (3.4) 3.5 marking product code voltage code dimensions are shown in millimeters tolerance: x.x = 0.2 mm (unless otherwise specified) +0.3 -0.1 + 0 . 1 5 - 0 . 0 5 +0.3 +0.15 -0.05 e xx a

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