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3.0a ultra low dropout linear regulator tj3966 aug. 2010 - rev. 1.7.1 - 1 - htc sop8-pp pkg to-252 3l/ 5l pkg to-263 3l/ 5l pkg to-220 3l/ 5l pkg ordering information device package tj3966dp-adj tj3966dp-x.x sop8-pp tj3966grs-adj tj3966grs-x.x to-252 3l/5l tj3966gr-adj tj3966gr-x.x to-263 3l/5l tj3966t-adj tj3966t-x.x to-220 3l/5l features z ultra low dropout voltage z low ground pin current z excellent line and load regulation z guaranteed output current of 3.0a z available in sop8-pp, to-252, to-263, and to-220 packages z fixed output voltages : 1.2v, 1.8v, 2.5v, 3.3v, and 5.0v z sense option improves load regulation z over-temperature/over-current protection z -40 to 125 junction temperature range z moisture sensitivity level 3 application z battery powered equipments z motherboards and graphic cards z microprocessor power supplies z peripheral cards z high efficiency linear regulators z battery chargers descripsion the tj3966 series of high performance ultra low-dropout linear regulators operates from 2.5v to 6v input supply and provides ultra low-dropout voltage, high output current with low ground current. wide range of preset output voltage options are available. these ultra low dropout linear regulators respond fast to step changes in load which makes them suitable for low voltage micro- processor applications. the tj3966 is developed on a cmos process technology which allows low quiescent current operation independent of output load current. this cmos process also allows the tj3966 to operate under extremely low dropout conditions. x.x = output voltage = 1.2, 1.8, 2.5, 3.3, and 5.0 absolute maximum ratings characteristic symbol min. max. unit input supply voltage (survival) v in -0.3 7.0 v enable input voltage (survival) v en (1) -0.3 7.0 v maximum output current i max - 3.0 a lead temperature (soldering, 5 sec) t sol 260 storage temperature range t stg -65 150 operating junction temperature range t jopr -40 125 (1) it is recommended for v en not to exceed v in voltage
3.0a ultra low dropout linear regulator tj3966 aug. 2010 - rev. 1.7.1 - 2 - htc ordering information v out package order no. description supplied as status sop8-pp tj3966dp-adj 3.0a, adjustable, enable reel active to-252 5l tj3966rs-adj-5l 3.0a, adjustable, enable reel obsolete to-252 5l tj3966grs-adj-5l 3.0a, adjustable, enable reel active to-263 5l tj3966r-adj-5l 3.0a, adjustable, enable reel obsolete to-263 5l tj3966gr-adj-5l 3.0a, adjustable, enable reel active adj to-220 5l tj3966t-adj- 3.0a, adjustable, enable tube active sop8-pp tj3966dp-1.2 3.0a, enable, sense reel active to-252 3l tj3966rs-1.2v-3l 3.0a reel obsolete to-252 3l tj3966grs-1.2v-3l 3.0a reel active to-252 5l tj3966rs-1.2v-5l 3.0a, enable, sense reel obsolete to-252 5l tj3966grs-1.2v-5l 3.0a, enable, sense reel active to-263 3l tj3966r-1.2v-3l 3.0a reel obsolete to-263 3l tj3966gr-1.2v-3l 3.0a reel active to-263 5l tj3966r-1.2v-5l 3.0a, enable, sense reel obsolete to-263 5l tj3966gr-1.2v-5l 3.0a, enable, sense reel active to-220 3l tj3966t-1.2v 3.0a tube active 1.2v to-220 5l tj3966t-1.2v 3.0a, enable, sense tube active sop8-pp tj3966dp-1.8v 3.0a, enable, sense reel active to-252 3l tj3966rs-1.8v-3l 3.0a reel obsolete to-252 3l tj3966grs-1.8v-3l 3.0a reel active to-252 5l tj3966rs-1.8v-5l 3.0a, enable, sense reel obsolete to-252 5l tj3966grs-1.8v-5l 3.0a, enable, sense reel active to-263 3l tj3966r-1.8v-3l 3.0a reel obsolete to-263 3l tj3966gr-1.8v-3l 3.0a reel active to-263 5l tj3966r-1.8v-5l 3.0a, enable, sense reel obsolete to-263 5l tj3966gr-1.8v-5l 3.0a, enable, sense reel active to-220 3l tj3966t-1.8v 3.0a tube active 1.8v to-220 5l tj3966t-1.8v 3.0a, enable, sense tube active sop8-pp tj3966dp-2.5v 3.0a, enable, sense reel active to-252 3l tj3966rs-2.5v-3l 3.0a reel obsolete to-252 3l tj3966grs-2.5v-3l 3.0a reel active to-252 5l tj3966rs-2.5v-5l 3.0a, enable, sense reel obsolete to-252 5l tj3966grs-2.5v-5l 3.0a, enable, sense reel active to-263 3l tj3966r-2.5v-3l 3.0a reel obsolete to-263 3l tj3966gr-2.5v-3l 3.0a reel active to-263 5l tj3966r-2.5v-5l 3.0a, enable, sense reel obsolete to-263 5l tj3966gr-2.5v-5l 3.0a, enable, sense reel active to-220 3l tj3966t-2.5v 3.0a tube active 2.5v to-220 5l tj3966t-2.5v 3.0a, enable, sense tube active
3.0a ultra low dropout linear regulator tj3966 aug. 2010 - rev. 1.7.1 - 3 - htc ordering information (continued) v out package order no. description supplied as status sop8-pp tj3966dp-3.3v 3.0a, enable, sense reel active to-252 3l tj3966rs-3.3v-3l 3.0a reel obsolete to-252 3l tj3966grs-3.3v-3l 3.0a reel active to-252 5l tj3966rs-3.3v-5l 3.0a, enable, sense reel obsolete to-252 5l tj3966grs-3.3v-5l 3.0a, enable, sense reel active to-263 3l tj3966r-3.3v-3l 3.0a reel obsolete to-263 3l tj3966gr-3.3v-3l 3.0a reel active to-263 5l tj3966r-3.3v-5l 3.0a, enable, sense reel obsolete to-263 5l tj3966gr-3.3v-5l 3.0a, enable, sense reel active to-220 3l tj3966t-3.3v 3.0a tube active 3.3v to-220 5l tj3966t-3.3v 3.0a, enable, sense tube active sop8-pp tj3966dp-5.0v 3.0a, enable, sense reel active to-252 3l tj3966rs-5.0v-3l 3.0a reel obsolete to-252 3l tj3966grs-5.0v-3l 3.0a reel active to-252 5l tj3966rs-5.0v-5l 3.0a, enable, sense reel obsolete to-252 5l tj3966grs-5.0v-5l 3.0a, enable, sense reel active to-263 3l tj3966r-5.0v-3l 3.0a reel obsolete to-263 3l tj3966gr-5.0v-3l 3.0a reel active to-263 5l tj3966r-5.0v-5l 3.0a, enable, sense reel obsolete to-263 5l tj3966gr-5.0v-5l 3.0a, enable, sense reel active to-220 3l tj3966t-5.0v 3.0a tube active 5.0v to-220 5l tj3966t-5.0v 3.0a, enable, sense tube active 3966 tj package type root name product code output voltage : adj / 1.2v / 1.8v / 2.5v / 3.3v / 5.0v dp rs r t : sop8-pp : to-252 : to-263 : to-220 green mode g blank : halogen free : pb free lead count : 3l / 5l (for to-252 / to-263 pkg only) * * it is written to distinguish the lead count of to-252 / to-263 pkg.
3.0a ultra low dropout linear regulator tj3966 aug. 2010 - rev. 1.7.1 - 4 - htc pin configuration sop8-pp (exposed pad) to252-3l to252-5l to263-3l to263-5l to220-3l to220-5l pin description to252 / to263 / to220 3 lead to252 / to263 / to220 5 lead sop8-pp 8 lead pin no. name function name function name function 1 v in input supply en chip enable en chip enable 2 gnd ground v in input supply v in input supply 3 v out output voltage gnd ground v out output voltage 4 - - v out output voltage sense/adj remote sense or output adjust 5 - - sense/adj remote sense or output adjust n.c not connect 6 - - - - n.c not connect 7 - - - - n.c not connect 8 - - - - gnd ground - - - - - exposed thermal pad connect to ground. en 1 vin 2 vout 3 sense/adj 4 8 gnd 7 n.c 6 n.c 5 n.c exposed pad
3.0a ultra low dropout linear regulator tj3966 aug. 2010 - rev. 1.7.1 - 5 - htc typical application typical 3 pin application typical 5 / 8 pin application 5 / 8 pin remote load sense application typical adjustable version application * tj3966 can deliver a continuous current of 3.0a over the full operating temperature. however, the output current is limited by the restriction of power dissipat ion which differs from packages. a heat sink may be required depending on the maximum power dissipation and maximum ambient temperature of application. with respect to the applied package, the maximum output current of 3.0a may be still undeliverable. * when a pull-up resistor is connected between v en terminal and v en signal (or v in line), the resistance of the pull-up resistor should be kept under 10k ? . * see application information v in v out tj3966 en sense gnd input output c in 68 f c out 33 + - l o a d v in v out tj3966 en adj gnd input output c in 68 f c out 33 + - r 1 r 2 v in v out tj3966 en sense gnd input output c in 68 f c out 33 + - v in v out tj3966 gnd input output c in 68 f c out 33 + - + - + - + - + -
3.0a ultra low dropout linear regulator tj3966 aug. 2010 - rev. 1.7.1 - 6 - htc electrical characteristics (note 1) limits in standard typeface are for tj=25 , and limits in boldface type apply over the full operating temperature range . unless otherwise specified: v in (note 2) = v o(nom) + 1 v, i l = 10 ma, c in = 68 f, c out = 33 f, v en = v in - 0.3 v parameter symbol test condit ion min. typ. max. unit output voltage tolerance v o 10 ma < i l < 3 a v out +1 v < v in < 6 v -2 -3 0 2 3 % adjustable pin voltage (adj version) v adj 10 ma < i l < 3 a v out +1.5 v < v in < 6 v 1.117 1.110 1.145 1.174 1.188 v line regulation (note 3) v line v out +1 v < v in < 6 v - 0.08 0.18 0.22 %/v load regulation (note 3, 4) v load 10 ma < i l < 3 a - 0.25 0.55 0.6 % i l = 300 ma - 50 65 80 dropout voltage (note 5) v drop i l = 3 a - 480 580 680 mv i l = 300 ma - 40 60 75 ground pin current (note 6) i gnd1 i l = 3 a - 40 60 75 ua ground pin current (note 7) i gnd2 v en < 0.2 v - 40 60 75 ua output peak current i peak 4.5 3.5 4.5 - a thermal shutdown temperature t sd - 165 - thermal shutdown hysteresis t sd - 10 - logic low v il output = low - 0 0.5 2 v in ? v enable threshold logic high v ih output = high 0.5 2 v in + v in - v enable input current i en v en = v in - 0.05 2 ua note 1. stresses listed as the absolute maximum ratings may c ause permanent damage to the device. these are for stress ratings. functional operating of the device at these or any other conditions beyond th ose indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rati ng conditions for extended periods may rema in possibly to affect device reliability. note 2. the minimum operating value for input voltage is equal to either (v out,nom + v drop ) or 2.5v, whichever is greater. note 3. output voltage line regulation is defined as the change in output voltage from the nominal value due to change in the i nput line voltage. output voltage load regulation is defined as the change in output voltage from the nominal value due to change in load current. note 4. regulation is measured at const ant junction temperature by using a 20ms curr ent pulse. devices are tested for load regu lation in the load range from 10ma to 3.0a note 5. dropout voltage is defined as the minimum input to output differential voltage at which the output drops 2% below the n ominal value. dropout voltage specification applies only to output voltages of 2.5v and above. for output voltages below 2.5v, the dropout vo ltage is nothing but the input to output differential, since the minimum input voltage is 2.5v note 6. ground current, or quiescent current, is the di fference between input and output currents. it's defined by i gnd1 = i in - i out under the given loading condition. the total current dr awn from the supply is the sum of the load current plus the ground pin current. note 7. ground current, or standby current, is the input current drawn by a regulator when the output voltage is disabled by an enable signal.
3.0a ultra low dropout linear regulator tj3966 aug. 2010 - rev. 1.7.1 - 7 - htc typical operating characteristics ambient temperature vs. output voltage change output current vs. dropout voltage power dissipation vs. case temperature, sop8-pp power dissipation vs. case temperature, to252 power dissipation vs. case temperature, to263 power dissipation vs. case temperature, to220 t. b . d .
3.0a ultra low dropout linear regulator tj3966 aug. 2010 - rev. 1.7.1 - 8 - htc application information output adjustment (adjustable version) an adjustable output device has output voltage range of 1.145v to 5.0v. to obtain a desired output voltage, the following equation can be used with (r1+r2) resistor range of 1k ? to 100k ? ? ? ? ? ? ? ? = 1 1.145 v r1 r2 out to enhance output stability, a capacitor of 68pf to 100pf can be placed in series with v out and adj. sense pin in applications where the regulator output is not very close to the load, the tj3966 can provide better remote load regulation characteristics using the sense pin. tj3966 regulates the voltage at the output pin. hence, the voltage at the remote load will be lower than the voltage at the output pin as a value of the voltage drop across the trace series resistance. if the sense option pin is not required, the sense pin must be connected to the v out pin. connecting the sense pin to the remote load will provide regulation at the remote load because the tj 3966 regulates the voltage at the sense pin when the sense option pin is used. output capacitor the tj3966 requires a proper output capacitance to maintain stability and improve transient response over current. the esr of the output capacitor within the limits of 0.5 ? to 10 ? is required. a minimum capacitance value of 22f of tantalum or aluminum el ectrolytic capacitor is recommended. in a case of ceramic capacitor, a minimum capacitance value of 10f is required and additional resistance of minimum 1 ? should be added with the output capacitor in series to maintain its minimum esr. the resistance and capacitance have to be varied upon the load current. vout adj gnd r2 r1 22f output + - vout adj gnd r2 r1 10f output additional resistance
3.0a ultra low dropout linear regulator tj3966 aug. 2010 - rev. 1.7.1 - 9 - htc maximum output current capability the tj3966 can deliver a continuous current of 3.0a over the full operating junction temperature range. however, the output current is limited by the restriction of power dissipat ion which differs from packages. a heat sink may be required depending on the maximum power dissipation and maximum ambient temperature of application. with respect to the ap plied package, the maximum output current of 3.0a may be still undeliverable due to the restriction of the power dissipation of tj3966. under all possible conditions, the junction temperature must be within the range specified under operating conditions. the temperatures over the device are given by: t c = t a + p d x ca / t j = t c + p d x jc / t j = t a + p d x ja where t j is the junction temperature, t c is the case temperature, t a is the ambient temperature, p d is the total power dissipation of the device, ca is the thermal resistan ce of case-to-ambient, jc is the thermal resistance of junction-to-case, and ja is the thermal resistance of junction to ambient. the total power dissipation of the device is given by: p d = p in ? p out = (v in x i in )?(v out x i out ) = (v in x (i out +i gnd )) ? (v out x i out ) = (v in - v out ) x i out + v in x i gnd where i gnd is the operating ground current of the device which is specified at the electrical characteristics. the maximum allowable temperature rise (t rmax ) depends on the maximum ambient temperature (t amax ) of the application, and the maximum allowable junction temperature (t jmax ): t rmax = t jmax ? t amax the maximum allowable value for junction-to-ambient thermal resistance, ja , can be calculated using the formula: ja = t rmax / p d = (t jmax ? t amax ) / p d tj3966 is available in sop8-pp, to225, to263 and to220 packages. the thermal resistance depends on amount of copper area or heat sink, and on air flow. if the maximum allowable value of ja calculated above is over 175c/w for sop8-pp package, ov er 105 c/w for to252 package, over 80 c/w for to263 package, over 70 c/w for to220 package, no heat sink is needed since the package can dissipate enough heat to satisfy these requirements. if the value for allowable ja falls near or below these limits, a heat sink or proper area of copper plane is required. in summary, the absolute maximum ratings of thermal resistances are as follow: absolute maximum ratings of thermal resistance no heat sink / no air flow / no adjacent heat source / t a = 25c characteristic symbol rating unit thermal resistance junction-to-ambient / sop8-pp ja-sop8-pp 175 c/w thermal resistance junction-to-ambient / to252 ja-to252 105 c/w thermal resistance junction-to-ambient / to263 ja-to263 80 c/w thermal resistance junction-to-ambient / to220 ja-to220 70 c/w in case that there is no cooling solution and no heat sink / copper plane area for heat sink, the maximum allowable power dissipation of each package is as follow;
3.0a ultra low dropout linear regulator tj3966 aug. 2010 - rev. 1.7.1 - 10 - htc characteristic symbol rating unit maximum allowable power dissipation at t a =25c / sop8-pp p dmax -sop8-pp 0.571 w maximum allowable power dissipation at t a =25c / to252 p dmax -to252 0.952 w maximum allowable power dissipation at t a =25c / to263 p dmax -to263 1.250 w maximum allowable power dissipation at t a =25c / to220 p dmax -to220 1.429 w - please note that above maximum allowable power dissipation is based on the minimum copper plane area which does not exceed the proper foot print of the package. and the ambient temperature is 25c. if proper cooling solution such as heat sink, copper plane area, air flow is applied, the maximum allowable power dissipation could be increased. howeve r, if the ambient temperature is increased, the allowable power dissipation would be decreased. for example, in case of to263 package, ja-to263 is 80 c/w, however, as shown in below graph, ja could be decreased with respect to the copper plane area. so, the specification of maximum power dissipation for an application is fixed, the proper copper plane area could be estimated by following graphs. as shown in graph, wider copper plane area leads lower ja . the maximum allowable power dissipation is also in fluenced by the ambient te mperature. with the above ja -copper plane area relationship, the maximum allowable power dissipation could be evaluated with respect to the ambient temperature. as s hown in graph, the higher copper plane area leads ja . and the higher ambient temperature leads lo wer maximum allowable power dissipation.
3.0a ultra low dropout linear regulator tj3966 aug. 2010 - rev. 1.7.1 - 11 - htc all this relationship is based on the aforesaid equation ; ja = t rmax / p d = (t jmax ? t amax ) / p d t. b . d .

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