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page 1 january, 1996 toko, inc. 1-4-96 tk112xxa voltage regulator with on/off switch features n high voltage precision at 2.4% n active high on/off control n very low dropout voltage 80 mv at 30 ma n very low noise n very small sot-23l or sot-89-5 surface mount packages n internal thermal shutdown n short circuit protection applications n battery powered systems n cellular telephones n pagers n personal communications equipment n portable instrumentation n portable consumer equipment n radio control systems n toys n low voltage systems tk112 a voltage code package code tape/reel code tape/reel code bx : bulk/bag tl : tape left (sot-23l) tb : tape bottom (sot-89-5) package code m: sot-23l u: sot-89-5 ordering information v oltage code 2 0 = 2.0 v* 2 1 = 2.1 v 2 2 = 2.22 v* 2 5 = 2.5 v* 2 8 = 2.8 v* 2 9 = 2.9 v 3 0 = 3.0 v* 3 1 = 3.1 v* 3 3 = 3.3 v* 35 = 3.5 v* 36 = 3.6 v 38 = 3.8 v 40 = 4.0 v* 42 = 4.2 v 45 = 4.5 v* 48 = 4.8 v* 49 = 4.9 v 50 = 5.0 v* 55 = 5.5 v * indicates voltage is available in a sot-89-5 package. block diagram s s s s s s s s s s s v ou t gnd + bandgap reference thermal protection + s noise bypass s s s s s s v in c ontrol s s tk112xxa p50 1 3 c ontrol gnd 6 4 v in v out tk112xxa ?po 2 5 gnd noise bypass 1 3 6 4 2 5 v ou t gnd noise bypass gnd c ontrol v in description the tk112xxa 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 m vrms. an internal pnp pass transistor is used to achieve a low dropout voltage of 70 mv (typ.) at 30 ma load current. the tk112xxa has a very low quiescent current of 180 m a at no load and 1 ma with a 30 ma load. the standby current is typically 100 na. the internal thermal shutdown circuitry limits the junction temperature to below 150 c. the load current is internally monitored and the device will shutdown in the presence of a short circuit or overcurrent condition at the output. the tk112xxa is available in either 6 pin sot-23l or 5 pin sot-89-5 surface mount packages.
page 2 1-4-96 january, 1996 toko, inc. tk112xx a symbol parameter test conditions min typ max units i in quiescent current i o = 0 ma, except i cont 170 350 m a i stby standby current v in = 8 v, at output off 0.1 m a v o output voltage i o = 30 ma 1.92 2.00 2.08 v v drop dropout voltage i o = 60 ma 0.16 0.26 v i o = 150 ma 0.29 0.4 v i o output current v out = 1.7 v 180 240 ma i or recommended output current 150 ma line reg line regulation v in = 3 v ? 8 v 3.0 20 mv load reg load regulation i o = 5 ma ? 60 ma (note 3) 10 50 mv i o = 5 ma ? 100 ma 20 100 mv i o = 5 ma ? 150 ma 30 160 mv rr ripple rejection 100 mv(rms), i o = 10 ma 55 db d v o / d t a output voltage i o = 10 ma 0.2 mv/ c temperature dependency -20 c t a + 75 c v no output noise voltage 10 hz < f < 80 khz, 30 m v(rms) i o = 30 ma v ref noise bypass terminal voltage 1.25 v control terminal specification i cont control current output on, v cont = 1.8 v 12 30 m a v cont control voltage output on 1.8 v output off 0.6 v t r output rise time i o = 30 ma, 0.3 ms v cont = 0 v ? 1.8 v absolute maximum ratings supply voltage ......................................................... 16 v power dissipation sot-23l (note 1) ................. 400 mw power dissipation sot-89-5 (note 2) ................ 800 mw storage temperature range ................... -55 to +150 c operating temperature range ...................-30 to +80 c lead soldering temp. (3 sec.) .............................. 230 c junction temperature ........................................... 150 c tk11220a electrical characteristics test conditions: t a = 25 c, v in = 3.0 v, c p = 0.1 m f, unless otherwise specified. note 1: power dissipation is 400 mw when mounted as recommended. derate at 3.2 mw/ c for t a > 25 c. note 2: power dissipation is 800 mw when mounted as recommended. derate at 6.4 mw/ c for t a > 25 c. note 3: this is a pulse measurement where t j is constant. the output change due to temperature is not included.
page 3 january, 1996 toko, inc. 1-4-96 tk112xxa symbol parameter test conditions min typ max units i in quiescent current i o = 0 ma, except i cont 170 350 m a i stby standby current v in = 8 v, at output off 0.1 m a v o output voltage i o = 30 ma 2.02 2.10 2.18 v v drop dropout voltage i o = 60 ma 0.16 0.26 v i o = 150 ma 0.29 0.4 v i o output current v out = 1.8 v 180 240 ma i or recommended output current 150 ma line reg line regulation v in = 3.1 v ? 8.1 v 3.0 20 mv load reg load regulation i o = 5 ma ? 60 ma (note 1) 10 50 mv i o = 5 ma ? 100 ma 20 100 mv i o = 5 ma ? 150 ma 30 160 mv rr ripple rejection 100 mv(rms), i o = 10 ma 55 db d v o / d t a output voltage v in = 3.5 v, i o = 10 ma 0.2 mv/ c temperature dependency -20 c t a + 75 c v no output noise voltage 10 hz < f < 80 khz, 30 m v(rms) i o = 30 ma v ref noise bypass terminal voltage 1.25 v control terminal specification i cont control current output on, v cont = 1.8 v 12 30 m a v cont control voltage output on 1.8 v output off 0.6 v t r output rise time i o = 30 ma, 0.3 ms v cont = 0 v ? 1.8 v tk11221a electrical characteristics test conditions: t a = 25 c, v in = 3.1 v, c p = 0.1 m f, unless otherwise specified. note 1: this is a pulse measurement where t j is constant. the output change due to temperature is not included.
page 4 1-4-96 january, 1996 toko, inc. tk112xx a symbol parameter test conditions min typ max units i in quiescent current i o = 0 ma, except i cont 170 350 m a i stby standby current v in = 8 v, at output off 0.1 m a v o output voltage i o = 30 ma 2.14 2.22 2.3 v v drop dropout voltage i o = 60 ma 0.16 0.26 v i o = 150 ma 0.29 0.4 v i o output current v out = 1.92 v 180 240 ma i or recommended output current 150 ma line reg line regulation v in = 3.22 v ? 8.22 v 3.0 20 mv load reg load regulation i o = 5 ma ? 60 ma (note 1) 10 50 mv i o = 5 ma ? 100 ma 20 100 mv i o = 5 ma ? 150 ma 30 160 mv rr ripple rejection 100 mv(rms), i o = 10 ma 55 db d v o / d t a output voltage v in = 3.72 v, i o = 10 ma 0.05 mv/ c temperature dependency -20 c t a + 75 c v no output noise voltage 10 hz < f < 80 khz, 30 m v(rms) i o = 30 ma v ref noise bypass terminal voltage 1.25 v control terminal specification i cont control current output on, v cont = 1.8 v 12 30 m a v cont control voltage output on 1.8 v output off 0.6 v t r output rise time i o = 30 ma, 0.3 ms v cont = 0 v ? 1.8 v tk11222a electrical characteristics test conditions: t a = 25 c, v in = 3.22 v, c p = 0.1 m f, unless otherwise specified. note 1: this is a pulse measurement where t j is constant. the output change due to temperature is not included.
page 5 january, 1996 toko, inc. 1-4-96 tk112xxa symbol parameter test conditions min typ max units i in quiescent current i o = 0 ma, except i cont 170 350 m a i stby standby current v in = 8 v, at output off 0.1 m a v o output voltage i o = 30 ma 2.42 2.50 2.58 v v drop dropout voltage i o = 60 ma 0.16 0.26 v i o = 150 ma 0.29 0.4 v i o output current v out = 2.2 v 180 240 ma i or recommended output current 150 ma line reg line regulation v in = 3.5 v ? 8.5 v (note 1) 3.0 20 mv load reg load regulation i o = 5 ma ? 60 ma 10 50 mv i o = 5 ma ? 100 ma 20 100 mv i o = 5 ma ? 150 ma 30 160 mv rr ripple rejection 100 mv(rms), i o = 10 ma 55 db d v o / d t a output voltage v in = 4.0 v, i o = 10 ma 0.05 mv/ c temperature dependency -20 c t a + 75 c v no output noise voltage 10 hz < f < 80 khz, 30 m v(rms) i o = 30 ma v ref noise bypass terminal voltage 1.25 v control terminal specification i cont control current output on, v cont = 1.8 v 12 30 m a v cont control voltage output on 1.8 v output off 0.6 v t r output rise time i o = 30 ma, 0.3 ms v cont = 0 v ? 1.8 v tk11225a electrical characteristics test conditions: t a = 25 c, v in = 3.5 v, c p = 0.1 m f, unless otherwise specified. note 1: this is a pulse measurement where t j is constant. the output change due to temperature is not included.
page 6 1-4-96 january, 1996 toko, inc. tk112xx a tk11228a electrical characteristics test conditions: t a = 25 c, v in = 3.8 v, c p = 0.1 m f, unless otherwise specified. symbol parameter test conditions min typ max units i in quiescent current i o = 0 ma, except i cont 170 350 m a i stby standby current v in = 8 v, at output off 0.1 m a v o output voltage i o = 30 ma 2.72 2.80 2.88 v v drop dropout voltage i o = 60 ma 0.16 0.26 v i o = 150 ma 0.29 0.4 v i o output current v out = 2.5 v 180 240 ma i or recommended output current 150 ma line reg line regulation v in = 3.8 v ? 8.8 v 3.0 20 mv load reg load regulation i o = 5 ma ? 60 ma (note 1) 10 50 mv i o = 5 ma ? 100 ma 20 100 mv i o = 5 ma ? 150 ma 30 160 mv rr ripple rejection 100 mv(rms), i o = 10 ma 55 db d v o / d t a output voltage v in = 4.3 v, i o = 10 ma 0.05 mv/ c temperature dependency -20 c t a + 75 c v no output noise voltage 10 hz < f < 80 khz, 30 m v(rms) i o = 30 ma v ref noise bypass terminal voltage 1.25 v control terminal specification i cont control current output on, v cont = 1.8 v 12 30 m a v cont control voltage output on 1.8 v output off 0.6 v t r output rise time i o = 30 ma, 0.3 ms v cont = 0 v ? 1.8 v note 1: this is a pulse measurement where t j is constant. the output change due to temperature is not included.
page 7 january, 1996 toko, inc. 1-4-96 tk112xxa tk11229a electrical characteristics test conditions: t a = 25 c, v in = 3.9 v, c p = 0.1 m f, unless otherwise specified. symbol parameter test conditions min typ max units i in quiescent current i o = 0 ma, except i cont 170 350 m a i stby standby current v in = 8 v, at output off 0.1 m a v o output voltage i o = 30 ma 2.82 2.90 2.98 v v drop dropout voltage i o = 60 ma 0.16 0.26 v i o = 150 ma 0.29 0.4 v i o output current v out = 2.6 v 240 ma i or recommended output current 150 ma line reg line regulation v in = 3.9 v ? 8.9 v 3.0 20 mv load reg load regulation i o = 5 ma ? 60 ma (note 1) 10 50 mv i o = 5 ma ? 100 ma 20 100 mv i o = 5 ma ? 150 ma 30 160 mv rr ripple rejection 100 mv(rms), i o = 10 ma 55 db d v o / d t a output voltage v in = 4.4 v, i o = 10 ma 0.05 mv/ c temperature dependency -20 c t a + 75 c v no output noise voltage 10 hz < f < 80 khz, 30 m v(rms) i o = 30 ma v ref noise bypass terminal voltage 1.25 v control terminal specification i cont control current output on, v cont = 1.8 v 12 30 m a v cont control voltage output on 1.8 v output off 0.6 v t r output rise time i o = 30 ma, 0.3 ms v cont = 0 v ? 1.8 v note 1: this is a pulse measurement where t j is constant. the output change due to temperature is not included.
page 8 1-4-96 january, 1996 toko, inc. tk112xx a tk11230a electrical characteristics test conditions: t a = 25 c, v in = 4.0 v, c p = 0.1 m f, unless otherwise specified. symbol parameter test conditions min typ max units i in quiescent current i o = 0 ma, except i cont 170 350 m a i stby standby current v in = 8 v, at output off 0.1 m a v o output voltage i o = 30 ma 2.92 3.00 3.08 v v drop dropout voltage i o = 60 ma 0.16 0.26 v i o = 150 ma 0.29 0.4 v i o output current v out = 2.7 v 180 240 ma i or recommended output current 150 ma line reg line regulation v in = 4 v ? 9 v 3.0 20 mv load reg load regulation i o = 5 ma ? 60 ma (note 1) 10 50 mv i o = 5 ma ? 100 ma 20 100 mv i o = 5 ma ? 150 ma 30 160 mv rr ripple rejection 100 mv(rms), i o = 10 ma 55 db d v o / d t a output voltage v in = 4.5 v, i o = 10 ma 0.05 mv/ c temperature dependency -20 c t a + 75 c v no output noise voltage 10 hz < f < 80 khz, 30 m v(rms) i o = 30 ma v ref noise bypass terminal voltage 1.25 v control terminal specification i cont control current output on, v cont = 1.8 v 12 30 m a v cont control voltage output on 1.8 v output off 0.6 v t r output rise time i o = 30 ma, 0.3 ms v cont = 0 v ? 1.8 v note 1: this is a pulse measurement where t j is constant. the output change due to temperature is not included.
page 9 january, 1996 toko, inc. 1-4-96 tk112xxa tk11231a electrical characteristics test conditions: t a = 25 c, v in = 4.1 v, c p = 0.1 m f, unless otherwise specified. symbol parameter test conditions min typ max units i in quiescent current i o = 0 ma, except i cont 170 350 m a i stby standby current v in = 8 v, at output off 0.1 m a v o output voltage i o = 30 ma 3.02 3.10 3.18 v v drop dropout voltage i o = 60 ma 0.16 0.26 v i o = 150 ma 0.29 0.4 v i o output current v out = 2.8 v 180 240 ma i or recommended output current 150 ma line reg line regulation v in = 4.1 v ? 9.1 v 3.0 20 mv load reg load regulation i o = 5 ma ? 60 ma (note 1) 10 50 mv i o = 5 ma ? 100 ma 20 100 mv i o = 5 ma ? 150 ma 30 160 mv rr ripple rejection 100 mv(rms), i o = 10 ma 55 db d v o / d t a output voltage v in = 4.6 v, i o = 10 ma 0.05 mv/ c temperature dependency -20 c t a + 75 c v no output noise voltage 10 hz < f < 80 khz, 30 m v(rms) i o = 30 ma v ref noise bypass terminal voltage 1.25 v control terminal specification i cont control current output on, v cont = 1.8 v 12 30 m a v cont control voltage output on 1.8 v output off 0.6 v t r output rise time i o = 30 ma, 0.3 ms v cont = 0 v ? 1.8 v note 1: this is a pulse measurement where t j is constant. the output change due to temperature is not included.
page 10 1-4-96 january, 1996 toko, inc. tk112xx a symbol parameter test conditions min typ max units i in quiescent current i o = 0 ma, except i cont 170 350 m a i stby standby current v in = 8 v, at output off 0.1 m a v o output voltage i o = 30 ma 3.22 3.30 3.38 v v drop dropout voltage i o = 60 ma 0.16 0.26 v i o = 150 ma 0.29 0.4 v i o output current v out = 3 v 180 240 ma i or recommended output current 150 ma line reg line regulation v in = 4.3 v ? 9.3 v 3.0 20 mv load reg load regulation i o = 5 ma ? 60 ma (note 1) 10 50 mv i o = 5 ma ? 100 ma 20 100 mv i o = 5 ma ? 150 ma 30 160 mv rr ripple rejection 100 mv(rms), i o = 10 ma 55 db d v o / d t a output voltage v in = 4.8 v, i o = 10 ma 0.05 mv/ c temperature dependency -20 c t a + 75 c v no output noise voltage 10 hz < f < 80 khz, 30 m v(rms) i o = 30 ma v ref noise bypass terminal voltage 1.25 v control terminal specification i cont control current output on, v cont = 1.8 v 12 30 m a v cont control voltage output on 1.8 v output off 0.6 v t r output rise time i o = 30 ma, 0.3 ms v cont = 0 v ? 1.8 v tk11233a electrical characteristics test conditions: t a = 25 c, v in = 4.3 v, c p = 0.1 m f, unless otherwise specified. note 1: this is a pulse measurement where t j is constant. the output change due to temperature is not included.
page 11 january, 1996 toko, inc. 1-4-96 tk112xxa symbol parameter test conditions min typ max units i in quiescent current i o = 0 ma, except i cont 170 350 m a i stby standby current v in = 8 v, at output off 0.1 m a v o output voltage i o = 30 ma 3.42 3.50 3.58 v v drop dropout voltage i o = 60 ma 0.16 0.26 v i o = 150 ma 0.29 0.4 v i o output current v out = 3.2 v 180 240 ma i or recommended output current 150 ma line reg line regulation v in = 4.5 v ? 9.5 v 3.0 20 mv load reg load regulation i o = 5 ma ? 60 ma (note 1) 10 50 mv i o = 5 ma ? 100 ma 20 100 mv i o = 5 ma ? 150 ma 30 160 mv rr ripple rejection 100 mv(rms), i o = 10 ma 55 db d v o / d t a output voltage v in = 5 v, i o = 10 ma 0.05 mv/ c temperature dependency -20 c t a + 75 c v no output noise voltage 10 hz < f < 80 khz, 30 m v(rms) i o = 30 ma v ref noise bypass terminal voltage 1.25 v control terminal specification i cont control current output on, v cont = 1.8 v 12 30 m a v cont control voltage output on 1.8 v output off 0.6 v t r output rise time i o = 30 ma, 0.3 ms v cont = 0 v ? 1.8 v tk11235a electrical characteristics test conditions: t a = 25 c, v in = 4.5 v, c p = 0.1 m f, unless otherwise specified. note 1: this is a pulse measurement where t j is constant. the output change due to temperature is not included.
page 12 1-4-96 january, 1996 toko, inc. tk112xx a tk11236a electrical characteristics test conditions: t a = 25 c, v in = 4.6 v, c p = 0.1 m f, unless otherwise specified. symbol parameter test conditions min typ max units i in quiescent current i o = 0 ma, except i cont 170 350 m a i stby standby current v in = 8 v, at output off 0.1 m a v o output voltage i o = 30 ma 3.51 3.60 369 v v drop dropout voltage i o = 60 ma 0.16 0.26 v i o = 150 ma 0.29 0.4 v i o output current v out = 3.3 v 180 240 ma i or recommended output current 150 ma line reg line regulation v in = 3.6 v ? 9.6 v 3.0 20 mv load reg load regulation i o = 5 ma ? 60 ma (note 1) 10 50 mv i o = 5 ma ? 100 ma 20 100 mv i o = 5 ma ? 150 ma 30 160 mv rr ripple rejection 100 mv(rms), i o = 10 ma 55 db d v o / d t a output voltage v in = 5.3 v, i o = 10 ma 0.1 mv/ c temperature dependency -20 c t a + 75 c v no output noise voltage 10 hz < f < 80 khz, 30 m v(rms) i o = 30 ma v ref noise bypass terminal voltage 1.25 v control terminal specification i cont control current output on, v cont = 1.8 v 12 30 m a v cont control voltage output on 1.8 v output off 0.6 v t r output rise time i o = 30 ma, 0.3 ms v cont = 0 v ? 1.8 v note 1: this is a pulse measurement where t j is constant. the output change due to temperature is not included.
page 13 january, 1996 toko, inc. 1-4-96 tk112xxa tk11238a electrical characteristics test conditions: t a = 25 c, v in = 4.8 v, c p = 0.1 m f, unless otherwise specified. symbol parameter test conditions min typ max units i in quiescent current i o = 0 ma, except i cont 170 350 m a i stby standby current v in = 8 v, at output off 0.1 m a v o output voltage i o = 30 ma 3.71 3.80 3.89 v v drop dropout voltage i o = 60 ma 0.16 0.26 v i o = 150 ma 0.29 0.4 v i o output current v out = 3.5 v 180 240 ma i or recommended output current 150 ma line reg line regulation v in = 4.8 v ? 9.8 v 3.0 20 mv load reg load regulation i o = 5 ma ? 60 ma (note 1) 10 50 mv i o = 5 ma ? 100 ma 20 100 mv i o = 5 ma ? 150 ma 30 160 mv rr ripple rejection 100 mv(rms), i o = 10 ma 55 db d v o / d t a output voltage v in = 5.3 v, i o = 10 ma 0.1 mv/ c temperature dependency -20 c t a + 75 c v no output noise voltage 10 hz < f < 80 khz, 30 m v(rms) i o = 30 ma v ref noise bypass terminal voltage 1.25 v control terminal specification i cont control current output on, v cont = 1.8 v 12 30 m a v cont control voltage output on 1.8 v output off 0.6 v t r output rise time i o = 30 ma, 0.3 ms v cont = 0 v ? 1.8 v note 1: this is a pulse measurement where t j is constant. the output change due to temperature is not included.
page 14 1-4-96 january, 1996 toko, inc. tk112xx a tk11240a electrical characteristics test conditions: t a = 25 c, v in = 5.0 v, c p = 0.1 m f, unless otherwise specified. symbol parameter test conditions min typ max units i in quiescent current i o = 0 ma, except i cont 170 350 m a i stby standby current v in = 8 v, at output off 0.1 m a v o output voltage i o = 30 ma 3.90 4.00 4.10 v v drop dropout voltage i o = 60 ma 0.16 0.26 v i o = 150 ma 0.29 0.4 v i o output current v out = 3.7 v 180 240 ma i or recommended output current 150 ma line reg line regulation v in = 5 v ? 10 v 3.0 20 mv load reg load regulation i o = 5 ma ? 60 ma (note 1) 10 50 mv i o = 5 ma ? 100 ma 20 100 mv i o = 5 ma ? 150 ma 30 160 mv rr ripple rejection 100 mv(rms), i o = 10 ma 55 db d v o / d t a output voltage v in = 5.5 v, i o = 10 ma 0.1 mv/ c temperature dependency -20 c t a + 75 c v no output noise voltage 10 hz < f < 80 khz, 40 m v(rms) i o = 30 ma v ref noise bypass terminal voltage 1.25 v control terminal specification i cont control current output on, v cont = 1.8 v 12 30 m a v cont control voltage output on 1.8 v output off 0.6 v t r output rise time i o = 30 ma, 0.3 ms v cont = 0 v ? 1.8 v note 1: this is a pulse measurement where t j is constant. the output change due to temperature is not included.
page 15 january, 1996 toko, inc. 1-4-96 tk112xxa tk11242a electrical characteristics test conditions: t a = 25 c, v in = 5.2 v, c p = 0.1 m f, unless otherwise specified. symbol parameter test conditions min typ max units i in quiescent current i o = 0 ma, except i cont 170 350 m a i stby standby current v in = 8 v, at output off 0.1 m a v o output voltage i o = 30 ma 4.10 4.20 4.30 v v drop dropout voltage i o = 60 ma 0.16 0.26 v i o = 150 ma 0.29 0.4 v i o output current v out = 3.9 v 240 ma i or recommended output current 150 ma line reg line regulation v in = 5.2 v ? 10.2 v 3.0 20 mv load reg load regulation i o = 5 ma ? 60 ma (note 1) 10 50 mv i o = 5 ma ? 100 ma 20 100 mv i o = 5 ma ? 150 ma 30 160 mv rr ripple rejection 100 mv(rms), i o = 10 ma 55 db d v o / d t a output voltage v in = 5.7 v, i o = 10 ma 0.1 mv/ c temperature dependency -20 c t a + 75 c v no output noise voltage 10 hz < f < 80 khz, 40 m v(rms) i o = 30 ma v ref noise bypass terminal voltage 1.25 v control terminal specification i cont control current output on, v cont = 1.8 v 12 30 m a v cont control voltage output on 1.8 v output off 0.6 v t r output rise time i o = 30 ma, 0.3 ms v cont = 0 v ? 1.8 v note 1: this is a pulse measurement where t j is constant. the output change due to temperature is not included.
page 16 1-4-96 january, 1996 toko, inc. tk112xx a tk11245a electrical characteristics test conditions: t a = 25 c, v in = 5.5 v, c p = 0.1 m f, unless otherwise specified. symbol parameter test conditions min typ max units i in quiescent current i o = 0 ma, except i cont 170 350 m a i stby standby current v in = 8 v, at output off 0.1 m a v o output voltage i o = 30 ma 4.39 4.50 4.61 v v drop dropout voltage i o = 60 ma 0.16 0.26 v i o = 150 ma 0.29 0.4 v i o output current v out = 4.2 v 180 240 ma i or recommended output current 150 ma line reg line regulation v in = 5 v ? 10 v 3.0 20 mv load reg load regulation i o = 5 ma ? 60 ma (note 1) 10 50 mv i o = 5 ma ? 100 ma 20 100 mv i o = 5 ma ? 150 ma 30 160 mv rr ripple rejection 100 mv(rms), i o = 10 ma 55 db d v o / d t a output voltage v in = 6 v, i o = 10 ma 0.1 mv/ c temperature dependency -20 c t a + 75 c v no output noise voltage 10 hz < f < 80 khz, 40 m v(rms) i o = 30 ma v ref noise bypass terminal voltage 1.25 v control terminal specification i cont control current output on, v cont = 1.8 v 12 30 m a v cont control voltage output on 1.8 v output off 0.6 v t r output rise time i o = 30 ma, 0.3 ms v cont = 0 v ? 1.8 v note 1: this is a pulse measurement where t j is constant. the output change due to temperature is not included.
page 17 january, 1996 toko, inc. 1-4-96 tk112xxa symbol parameter test conditions min typ max units i in quiescent current i o = 0 ma, except i cont 170 350 m a i stby standby current v in = 8 v, at output off 0.1 m a v o output voltage i o = 30 ma 4.68 4.80 4.92 v v drop dropout voltage i o = 60 ma 0.16 0.26 v i o = 150 ma 0.29 0.4 v i o output current v out = 4.5 v 180 240 ma i or recommended output current 150 ma line reg line regulation v in = 5.8 v ? 10.8 v 3.0 20 mv load reg load regulation i o = 5 ma ? 60 ma (note 1) 10 50 mv i o = 5 ma ? 100 ma 20 100 mv i o = 5 ma ? 150 ma 30 160 mv rr ripple rejection 100 mv(rms), i o = 10 ma 55 db d v o / d t a output voltage v in = 6.3 v, i o = 10 ma 0.1 mv/ c temperature dependency -20 c t a + 75 c v no output noise voltage 10 hz < f < 80 khz, 40 m v(rms) i o = 30 ma v ref noise bypass terminal voltage 1.25 v control terminal specification i cont control current output on, v cont = 1.8 v 12 30 m a v cont control voltage output on 1.8 v output off 0.6 v t r output rise time i o = 30 ma, 0.3 ms v cont = 0 v ? 1.8 v tk11248a electrical characteristics test conditions: t a = 25 c, v in = 5.8 v, c p = 0.1 m f, unless otherwise specified. note 1: this is a pulse measurement where t j is constant. the output change due to temperature is not included.
page 18 1-4-96 january, 1996 toko, inc. tk112xx a symbol parameter test conditions min typ max units i in quiescent current i o = 0 ma, except i cont 170 350 m a i stby standby current v in = 8 v, at output off 0.1 m a v o output voltage i o = 30 ma 4.78 4.90 5.02 v v drop dropout voltage i o = 60 ma 0.16 0.26 v i o = 150 ma 0.29 0.4 v i o output current v out = 4.6 v 180 240 ma i or recommended output current 150 ma line reg line regulation v in = 5.9 v ? 10.9 v 3.0 20 mv load reg load regulation i o = 5 ma ? 60 ma (note 1) 10 50 mv i o = 5 ma ? 100 ma 20 100 mv i o = 5 ma ? 150 ma 30 160 mv rr ripple rejection 100 mv(rms), i o = 10 ma 55 db d v o / d t a output voltage v in = 6.4 v, i o = 10 ma 0.2 mv/ c temperature dependency -20 c t a + 75 c v no output noise voltage 10 hz < f < 80 khz, 40 m v(rms) i o = 30 ma v ref noise bypass terminal voltage 1.25 v control terminal specification i cont control current output on, v cont = 1.8 v 12 30 m a v cont control voltage output on 1.8 v output off 0.6 v t r output rise time i o = 30 ma, 0.3 ms v cont = 0 v ? 1.8 v tk11249a electrical characteristics test conditions: t a = 25 c, v in = 5.9 v, c p = 0.1 m f, unless otherwise specified. note 1: this is a pulse measurement where t j is constant. the output change due to temperature is not included.
page 19 january, 1996 toko, inc. 1-4-96 tk112xxa tk11250a electrical characteristics test conditions: t a = 25 c, v in = 6.0 v, c p = 0.1 m f, unless otherwise specified. symbol parameter test conditions min typ max units i in quiescent current i o = 0 ma, except i cont 170 350 m a i stby standby current v in = 8 v, at output off 0.1 m a v o output voltage i o = 30 ma 4.88 5.00 5.12 v v drop dropout voltage i o = 60 ma 0.16 0.26 v i o = 150 ma 0.29 0.4 v i o output current v out = 4.7 v 180 240 ma i or recommended output current 150 ma line reg line regulation v in = 6 v ? 11 v 3.0 20 mv load reg load regulation i o = 5 ma ? 60 ma (note 1) 10 50 mv i o = 5 ma ? 100 ma 20 100 mv i o = 5 ma ? 150 ma 30 160 mv rr ripple rejection 100 mv(rms), i o = 10 ma 55 db d v o / d t a output voltage v in = 6.5 v, i o = 10 ma 0.2 mv/ c temperature dependency -20 c t a + 75 c v no output noise voltage 10 hz < f < 80 khz, 50 m v(rms) i o = 30 ma v ref noise bypass terminal voltage 1.25 v control terminal specification i cont control current output on, v cont = 1.8 v 12 30 m a v cont control voltage output on 1.8 v output off 0.6 v t r output rise time i o = 30 ma, 0.3 ms v cont = 0 v ? 1.8 v note 1: this is a pulse measurement where t j is constant. the output change due to temperature is not included.
page 20 1-4-96 january, 1996 toko, inc. tk112xx a tk11255a electrical characteristics test conditions: t a = 25 c, v in = 6.5 v, c p = 0.1 m f, unless otherwise specified. symbol parameter test conditions min typ max units i in quiescent current i o = 0 ma, except i cont 170 350 m a i stby standby current v in = 8 v, at output off 0.1 m a v o output voltage i o = 30 ma 5.36 5.5 5.63 v v drop dropout voltage i o = 60 ma 0.16 0.26 v i o = 150 ma 0.29 0.4 v i o output current v out = 5.2 v 180 240 ma i or recommended output current 150 ma line reg line regulation v in = 6.5 v ? 11.5 v 3.0 20 mv load reg load regulation i o = 5 ma ? 60 ma (note 1) 10 50 mv i o = 5 ma ? 100 ma 20 100 mv i o = 5 ma ? 150 ma 30 160 mv rr ripple rejection 100 mv(rms), i o = 10 ma 55 db d v o / d t a output voltage v in = 7 v, i o = 10 ma 0.2 mv/ c temperature dependency -20 c t a + 75 c v no output noise voltage 10 hz < f < 80 khz, 50 m v(rms) i o = 30 ma v ref noise bypass terminal voltage 1.25 v control terminal specification i cont control current output on, v cont = 1.8 v 12 30 m a v cont control voltage output on 1.8 v output off 0.6 v t r output rise time i o = 30 ma, 0.3 ms v cont = 0 v ? 1.8 v note 1: this is a pulse measurement where t j is constant. the output change due to temperature is not included.
page 21 january, 1996 toko, inc. 1-4-96 tk112xxa typical performance characteristics test circuits sot-23l sot-89-5 line regulation 010 v cc (v) v o (v) 2 2 0 50 mv/div v o 0 50 100 i o (ma) v o (v) 1 15 0 20 mv/div load regulation v o t a = 25 c unless otherwise specified dropout voltage vs. load current 0 100 i o (ma) v drop (mv) 6 20 0 100 200 300 400 500 t a = 25 c output voltage vs. input voltage v cc v out 5 v cc = v out 50 mv/div i o = 0 ma i o = 30 ma i o = 60 ma i o = 90 ma 50 mv/div quiescent current vs. load current 0 100 i o (ma) i q (ma) 4 20 0 10 20 supply voltage vs. input current (no load) 05 v cc (v) i cc (ma) 7 9 1 0 1 2 2 v 3 v 4 v 5 v 1 4 5 6 23 s v in v a a s s s v o i o v in v o 2.2 f i cont cont cont + + _ + _ 0.1 f noise bypass + i in v 0.1 f ?pin 5 is heat fin contact to gnd transient response 112 x x a v in c ont + v out + rs 1 f c p 0.1 f c l = .22 t o 10 f s v a a s s s + + _ + _ + 1 4 5 6 23 v in i o v in v o 0.1 f 2.2 f i cont cont noise bypass i in v v in v cont 0.1 f
page 22 1-4-96 january, 1996 toko, inc. tk112xx a typical performance characteristics (cont.) t a = 25 c unless otherwise specified quiescent current vs. input voltage (off) 010 v cc (v) i q (pa) 9 2 0 500 1000 t a = 25 c short current vs. output voltage 0 150 i o (ma) v o (v) 8 0 30 0 2 5 1 3 4 2 v 3 v 4 v 5 v control current vs. control voltage 01 v c(on) = v cc ? v cont (v) i cont ( a) 8 ? 10 20 30 40 50 v o r c = 0 ? ? ? r c = 50 k r c = 100 k r c = 10 k r c = 0 r c = 50 k r c = 100 k r c = 10 k t a = 25 c ripple rejection vs. frequency 100 10 k frequency (hz) (db) 12 100 k -100 -50 0 1 k noise level vs. frequency 0 500 k frequency (hz) noise (db) 1 1 1 m -100 -50 c l = 3.3 f, c p = 0 c l = 3.3 f, c p = 0.01 f analyze r t a = 25 c line transient response 1 3 v o v cc 50 s/div c l = 0.22 f c p = 1000 pf (v o +1)v (v o +2)v 10 mv/div c l = 2.2 f c p = 0.01 f output voltage response (off on) 1 5 v o sd 5 s/div c l = 0.22 f c l = 1000 pf i o = 60 ma c l = 0.68 f c l = 1.0 f c l = 2.2 f load transient response 1 4 v o i o 50 s/div c l = 0.22 f 50 ma 100 ma 50 mv/div c l = 2.2 f noise level vs. bypass capacitor 1pf 10pf c p v drop (mv) 16 100pf 50 100 150 200 250 1000pf 0.01 f 0.1 f v o = 5 v v o = 2 v v o = 2 v v o = 5 v c l = 10 f c l = 22 f i o = 60 ma
page 23 january, 1996 toko, inc. 1-4-96 tk112xxa typical performance characteristics (cont.) output voltage vs. load current 0 150 i o (ma) v o (v) 2 6 30 0 1 2 3 4 5 t a = 25 c tk11220a input current vs. input voltage (no load) 05 v cc (v) i cc (ma) 2 5 1 0 1 2 -50 0 50 temperature (c) d v o (v) 2 7 10 0 0 output voltage change vs. temperature +50 mv -50 mv t a = 25 c unless otherwise specified -50 0 50 temperature (c) v drop (mv) 1 8 10 0 i o = 100 ma 0 200 300 400 500 100 i o = 30 ma dropout voltage vs. temperature -50 0 50 temperature (c) i q (ma) 1 7 10 0 i o = 60 ma 0 2 3 4 5 1 i o = 30 ma quiescent current vs. temperature -50 0 50 temperature (c) i cont ( a) 1 9 10 0 v cont = 5 v 0 20 30 40 50 10 v cont = 2.4 v control current vs. temperature -50 0 50 temperature (c) i o (ma) 2 1 10 0 0 220 240 260 280 200 output current vs. temperature -50 0 50 temperature (c) v cont (v) 2 0 10 0 0 1.0 2.0 control voltage threshold vs. temperature r c = 0 -50 0 50 temperature (c) 8 1 10 0 0 + output voltage variation 10 mv/div 2 v 3 v 4 v 5 v
page 24 1-4-96 january, 1996 toko, inc. tk112xx a typical performance characteristics (cont.) tk11221a tk11225a output voltage vs. load current 0 150 i o (ma) v o (v) 2 9 30 0 1 2 3 4 5 t a = 25 c d v out (v) 0 +50 mv -50 mv -50 0 50 temperature (c) 3 0 10 0 output voltage change vs. temperature input current vs. input voltage (no load) 05 v cc (v) i cc (ma) 2 8 1 0 1 2 output voltage vs. load current 0 150 i o (ma) v o (v) 5 2 30 0 1 2 3 4 5 t a = 25 c input current vs. input voltage (no load) 05 v cc (v) i cc (ma) 5 3 1 0 1 2 -50 0 50 temperature (c) d v o (v) 5 4 10 0 0 output voltage change vs. temperature +50 mv -50 mv tk11222a output voltage vs. load current 0 150 i o (ma) v o (v) 5 5 30 0 1 2 3 4 5 t a = 25 c -50 0 50 temperature (c) d v o (v) 5 7 10 0 0 output voltage change vs. temperature +50 mv -50 mv input current vs. input voltage (no load) 05 v cc (v) i cc (ma) 5 6 1 0 1 2 t a = 25 c unless otherwise specified
page 25 january, 1996 toko, inc. 1-4-96 tk112xxa typical performance characteristics (cont.) tk11228a t a = 25 c unless otherwise specified output voltage vs. load current 0 150 i o (ma) v o (v) 5 9 30 0 1 2 3 4 5 t a = 25 c input current vs. input voltage (no load) 05 v cc (v) i cc (ma) 5 8 1 0 1 2 -50 0 50 temperature (c) d v o (v) 6 0 10 0 0 output voltage change vs. temperature +50 mv -50 mv tk11229a output voltage vs. load current 0 150 i o (ma) v o (v) 6 1 30 0 1 2 3 4 5 t a = 25 c input current vs. input voltage (no load) 05 v cc (v) i cc (ma) 6 2 1 0 1 2 d v o (v) 0 +50 mv -50 mv -50 0 50 temperature (c) 6 3 10 0 10 mv/div output voltage change vs. temperature tk11230a output voltage vs. load current 0 150 i o (ma) v o (v) 3 2 30 0 1 2 3 4 5 t a = 25 c d v o (v) 0 +50 mv -50 mv -50 0 50 temperature (c) 3 3 10 0 10 mv/div output voltage change vs. temperature input current vs. input voltage (no load) 05 v cc (v) i cc (ma) 3 1 1 0 1 2
page 26 1-4-96 january, 1996 toko, inc. tk112xx a tk11231a output voltage vs. load current 0 150 i o (ma) v o (v) 3 5 30 0 1 2 3 4 5 t a = 25 c d v o (v) 0 +50 mv -50 mv -50 0 50 temperature (c) 3 6 10 0 output voltage change vs. temperature input current vs. input voltage (no load) 05 v cc (v) i cc (ma) 3 4 1 0 1 2 typical performance characteristics (cont.) tk11233a output voltage vs. load current 0 150 i o (ma) v o (v) 6 4 30 0 1 2 3 4 5 t a = 25 c input current vs. input voltage (no load) 05 v cc (v) i cc (ma) 6 5 1 0 1 2 d v o (v) 0 +50 mv -50 mv -50 0 50 temperature (c) 6 6 10 0 output voltage change vs. temperature t a = 25 c unless otherwise specified tk11235a output voltage vs. load current 0 150 i o (ma) v o (v) 3 8 30 0 1 2 3 4 5 t a = 25 c d v o (v) 0 +50 mv -50 mv -50 0 50 temperature (c) 3 9 10 0 output voltage change vs. temperature input current vs. input voltage (no load) 05 v cc (v) i cc (ma) 3 7 1 0 1 2
page 27 january, 1996 toko, inc. 1-4-96 tk112xxa typical performance characteristics (cont.) t a = 25 c unless otherwise specified tk11240a output voltage vs. load current 0 150 i o (ma) v o (v) 4 1 30 0 1 2 3 4 5 t a = 25 c d v o (v) 0 +50 mv -50 mv -50 0 50 temperature (c) 4 2 10 0 output voltage change vs. temperature input current vs. input voltage (no load) 05 v cc (v) i cc (ma) 4 0 1 0 1 2 tk11238a output voltage vs. load current 0 150 i o (ma) v o (v) 6 7 30 0 1 2 3 4 5 t a = 25 c d v o (v) 0 +50 mv -50 mv -50 0 50 temperature (c) 6 9 10 0 output voltage change vs. temperature input current vs. input voltage (no load) 05 v cc (v) i cc (ma) 6 8 1 0 1 2 tk11236a output voltage vs. load current 0 150 i o (ma) v o (v) 8 2 30 0 1 2 3 4 5 t a = 25 c input current vs. input voltage (no load) 05 v cc (v) i cc (ma) 8 3 1 0 1 2 d v o (v) 0 +50 mv -50 mv -50 0 50 temperature (c) 8 4 10 0 output voltage change vs. temperature
page 28 1-4-96 january, 1996 toko, inc. tk112xx a typical performance characteristics (cont.) t a = 25 c unless otherwise specified tk11245a output voltage vs. load current 0 150 i o (ma) v o (v) 4 4 30 0 1 2 3 4 5 t a = 25 c d v o (v) 0 +50 mv -50 mv -50 0 50 temperature (c) 45 100 output voltage change vs. temperature input current vs. input voltage (no load) 05 v cc (v) i cc (ma) 4 3 1 0 1 2 tk11248a output voltage vs. load current 0 150 i o (ma) v o (v) 7 3 30 0 1 2 3 4 5 t a = 25 c input current vs. input voltage (no load) 05 v cc (v) i cc (ma) 7 4 1 0 1 2 d v o (v) 0 +50 mv -50 mv -50 0 50 temperature (c) 7 5 10 0 output voltage change vs. temperature tk11242a output voltage vs. load current 0 150 i o (ma) v o (v) 7 0 30 0 1 2 3 4 5 t a = 25 c input current vs. input voltage (no load) 05 v cc (v) i cc (ma) 7 1 1 0 1 2 d v o (v) 0 +50 mv -50 mv -50 0 50 temperature (c) 7 2 10 0 output voltage change vs. temperature
page 29 january, 1996 toko, inc. 1-4-96 tk112xxa typical performance characteristics (cont.) t a = 25 c unless otherwise specified tk11255a output voltage vs. load current 0 150 i o (ma) v o (v) 7 6 30 0 1 2 3 4 5 t a = 25 c d v o (v) 0 +50 mv -50 mv -50 0 50 temperature (c) 7 8 10 0 output voltage change vs. temperature input current vs. input voltage (no load) 05 v cc (v) i cc (ma) 7 7 1 0 1 2 output voltage vs. load current 0 150 i o (ma) v o (v) 5 0 30 0 1 2 3 4 5 t a = 25 c d v o (v) 0 +50 mv -50 mv -50 0 50 temperature (c) 5 1 10 0 output voltage change vs. temperature input current vs. input voltage (no load) 05 v cc (v) i cc (ma) 4 9 1 0 1 2 tk11250a tk11249a output voltage vs. load current 0 150 i o (ma) v o (v) 8 5 30 0 1 2 3 4 5 t a = 25 c input current vs. input voltage (no load) 05 v cc (v) i cc (ma) 8 6 1 0 1 2 d v o (v) 0 +50 mv -50 mv -50 0 50 temperature (c) 8 7 10 0 output voltage change vs. temperature
page 30 1-4-96 january, 1996 toko, inc. tk112xx a definition and explanation of technical terms line regulation (line reg) line regulation is the relationship between change in output voltage due to a change in input voltage. load regulation (load reg) load regulation is the relationship between change in output voltage due to a change in load current. drop out voltage (v drop ) this is a measure of how well the regulator performs as the input voltage decreases. the smaller the number, the further the input voltage can decrease before regulation problems occur. nominal output voltage is first measured when v in = v out + 1 at a chosen load current. when the output voltage has dropped 100 mv from the nominal, v in - v out is the dropout voltage. this voltage is affected by load current and junction temperature. output noise voltage this is the effective ac voltage that occurs on the output voltage under the condition where the input noise is low and with a given load, filter capacitor, and frequency range. thermal protection this is an internal feature which turns the regulator off when the junction temperature rises above 150 c. after the regulator turns off, the temperature drops and the regulator output turns back on. under certain conditions, the output waveform may appear to be an oscillation as the output turns off and on and back again in succession. 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 shutdown. 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 400 mw. for operation at ambient temperatures over 25 c, the power dissipation of the sot-23l device should be derated at 3.2 mw/ c. the power dissipation of the sot-89-5 package is 800 mw when mounted as recommended. derate the power dissi- pation at 6.4 mw/ c for operation above 25 c. to determine the power dissipation for shutdown when mounted, attach the device on the actual pcb and deliber- ately 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 pd/(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 x p d = 125 c 0 ja = 125 c/ p d p d is the value when the thermal sensor is activated. a simple way to determine pd 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 currents usable can also be found from the graph below. p d d pd 25 50 75 150 (mw) t (c) 3 6 5 4 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.
page 31 january, 1996 toko, inc. 1-4-96 tk112xxa 0 50 100 t a (c) 0 p d (mw) 1000 2000 24 15 0 glass epoxy circuit board 10 x 10 mm ceramic substrate 25 x 30 mm unmounted mounted as shown sot-89-5 power dissipation curve copper pattern should be as large as possible. power dissipation is 400 mw for sot-23l and 800 mv for sot- 89-5. a low 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 m f. input/output decoupling capacitor consider- ations voltage regulators require input and output decoupling capacitors. the required value of these capacitors vary with application. capacitors made by different manufactur- ers can have different characteristics, particularly with regard to high frequencies and equivalent resistance (esr) over temperature. the type of capacitor is also important. for example, a 4.7 m f aluminum electrolytic may be re- quired for a certain application. if a tantalum capacitor is used, a lower value of 2.2 m f would be adequate. it is important to consider the temperature characteristics of the decoupling capacitors. while toko regulators are de- signed to operate as low as -40 c, many capacitors will not operate properly at this temperature. the capacitance of aluminum electrolytic capacitors may decrease to 0 at low temperatures. this may cause oscillation on the output of the regulator since some capacitance is required to guar- antee stability. thus, it is important to consider the charac- teristics of the capacitor over temperature when selection decoupling capacitors. the esr is another important parameter. the esr will increase with temperature but low esr capacitors are often larger and more costly. in general, tantalum capacitors offer lower esr than alumi- num electrolytic, but new low esr aluminum electrolytic definition and explanation of technical terms (cont.) 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 ). + a + a gnd on/off v in v o sot-23l board layout 0 50 100 t a (c) 0 p d (mw) 300 500 23 15 0 mounted as shown unmounted 400 200 100 sot-23l power dissipation curve + a + a on/off v in v o sot-89-5 board layout
page 32 1-4-96 january, 1996 toko, inc. tk112xx a definition and explanation of technical terms (cont.) capacitors are now available from several manufacturers. usually a bench test is sufficient to determine the minimum capacitance required for a particular application. after taking thermal characteristics and tolerance into account, the minimum capacitance value should be approximately two times this value. the recommended minimum capaci- tance for the tk112xxa is 2.2 m f. please note that linear regulators with a low dropout voltage have high internal loop gains which requires care in guarding against oscilla- tion caused by insufficient decoupling capacitance. the use of high quality decoupling capacitors suited for your application will guarantee proper operation of the circuit. noise bypass capacitor section the noise bypass capacitor (c p ) should be connected as close as possible to pin 3 and ground. the recommended value for c p is 0.01 m f. the noise bypass terminal has a high impedance and care should be taken if the noise bypass capacitor is not used. this terminal is susceptible to external noise and oscillation can occur when c p is not used and the solder pad for this pin is made too large.
page 33 january, 1996 toko, inc. 1-4-96 tk112xxa control function 11250a v in cont v o gnd 11230a v in cont v o gnd 11220a v in cont v o gnd + + + 5 v 3 v 2 v + + r on/off 0.1 f 0.1 f v in to reduce ic power dissipation, connect a resistor, r s , in series with v in for the lower output voltage devices. this will prevent thermal shutdown due to excessive power dissipation. 1 4 5 6 23 s c p v in sw r sot-23l if the control function is not used, connect the control terminal to a logic high level or v in. this will allow the regulator to be on. the regulator will be on when the control terminal voltage is greater than 1.8 v. the seris resistor, r s , should be less than 300 k w . the control current will decrease as r s , increases. the control threshold voltage will also change. 1 4 5 6 23 s c p v i n sw r sot-89-5 parallel connection for on/off control the input and control current in the off mode are less than 200 pa. 112xxa cont + v o gnd + c mos/ttl logic c out c in v in microprocessor/logic control
page 34 1-4-96 january, 1996 toko, inc. tk112xx a ? 1994 toko america, inc. all rights reserved ic-114-tk112 sot-23l package outline your local representative is: the information furnished by toko, inc. is believed to be accurate and reliable. however, toko reserves the right to make changes 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 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 patent or patent rights of toko, inc. toko america 1250 feehanville dr. mt. prospect, ill 60056 tel: 1(800) pik-toko fax: 1(847) 699-1194 sot-89-5 0.49max 0.54max 0.49max 1.5 3.0 2.5 1.0 4.5 e e e' 0.49max 0.49max 0.49max 1.6 4.5 0.4 1.5 0.44max 0.44max 0.1 0.1 0.1 1.5 +0.5 -0.3 unit:mm 1 2 3 4 5 voltage code product code 0.95 0.95 0.4 e e 0.1 m 3.4 1.25 1.2 0.05 0.15 0.3 3.3 2.2 0.4 +0.1 -0.05 0.2 0.2 0.2 0.05 0.3 +0.1 -0.05 0.95 0.95 3.2 e e e 1 0.6 1.0 0.15 +0.15 - 0 recommended mount pad 1 2 3 4 5 6 30 max orientation mark voltage code product code (pin 2 and pin 5 should be grounded for heat dissipation) .7max 1.0 .7max 2.0 1.5 .7 .8 .7 1.5 1.5 1.5 45 recommended mount pad marking information product code p voltage code tk11220a 20 tk11221a 21 tk11222a 22 tk11225a 25 tk11228a 28 tk11229a 29 tk11230a 30 tk11231a 31 tk11233a 33 tk11235a 35 tk11236a 36 tk11238a 38 tk11240a 40 tk11242a 42 tk11245a 45 tk11248a 48 tk11249a 49 tk11250a 50 tk11255a 55 printed in u.s.a.

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