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1a ultra low dropout linear regulator tj3964 dec. 2009 ? rev. 1.1 - 1 - htc sot23-5l pkg sop-8 pkg sot-223 3l pkg to-252 3l / 5l pkg ordering information device package tj3964sf5-adj tj3964sf5-x.x tj3964gsf5-adj tj3964gsf5-x.x sot-23 5l tj3964d-adj tj3964d-x.x sop-8 tj3964s-x.x sot-223 3l tj3964grs-adj tj3964grs-x.x to-252 3l / 5l features z ultra low dropout voltage z low ground pin current z excellent line and load regulation z guaranteed output current of 1a z available in sot-23-5, sot-223, to-252, and sop-8 packages z fixed output voltages : 1.2v, 1.5v, 1.8v, 2.5v, and 3.3v 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 tj3964 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. x.x = output voltage = 1.2, 1.5, 1.8, 2.5, and 3.3 these ultra low dropout linear regulators respond fast to step changes in load which makes them suitable for low voltage micro-processor applications. the tj3964 is deve loped on a cmos process technology which allows low quiescent current operation independent of output load current. this cmos process also allows the tj3964 to operate under extremely low dropout conditions. absolute maximum ratings characteristic symbol min. max. unit input supply voltage (survival) v in -0.3 6.5 v enable input voltage (survival) v en (1) -0.3 6.5 v maximum output current i max - 1.0 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 voltage not to exceed v in voltage.
1a ultra low dropout linear regulator tj3964 dec. 2009 ? rev. 1.1 - 2 - htc ordering information v out package order no. description supplied as status sot-23 5l tj3964sf5 -adj 1a, adjustable, enable reel contact us sot-23 5l tj3964gsf5 -adj 1a, adjustable, enable reel contact us to-252 5l tj3964grs -adj -5l 1a, adjustable, enable reel contact us adj sop-8 8l tj3964d -adj 1a, adjustable, enable reel contact us sot-23 5l tj3964sf5 -1.2 1a, enable, sense reel contact us sot-23 5l tj3964gsf5 -1.2 1a, enable, sense reel contact us sot-223 3l tj3964s -1.2 1a reel contact us to-252 3l tj3964grs -1.2 -3l 1a reel contact us to-252 5l tj3964grs -1.2 -5l 1a, enable, sense reel contact us 1.2v sop-8 8l tj3964d -1.2 1a, enable, sense reel contact us sot-23 5l tj3964sf5 -1.5 1a, enable, sense reel contact us sot-23 5l tj3964gsf5 -1.5 1a, enable, sense reel contact us sot-223 3l tj3964s -1.5 1a reel contact us to-252 3l tj3964grs -1.5 -3l 1a reel contact us to-252 5l tj3964grs -1.5 -5l 1a, enable, sense reel contact us 1.5v sop-8 8l tj3964d -1.5 1a, enable, sense reel contact us sot-23 5l tj3964sf5 -1.8 1a, enable, sense reel contact us sot-23 5l tj3964gsf5 -1.8 1a, enable, sense reel contact us sot-223 3l tj3964s -1.8 1a reel contact us to-252 3l tj3964grs -1.8 -3l 1a reel contact us to-252 5l tj3964grs -1.8 -5l 1a, enable, sense reel contact us 1.8v sop-8 8l tj3964d -1.8 1a, enable, sense reel contact us sot-23 5l tj3964sf5 -2.5 1a, enable, sense reel contact us sot-23 5l tj3964gsf5 -2.5 1a, enable, sense reel contact us sot-223 3l tj3964s -2.5 1a reel contact us to-252 3l tj3964grs -2.5 -3l 1a reel contact us to-252 5l tj3964grs -2.5 -5l 1a, enable, sense reel contact us 2.5v sop-8 8l tj3964d -2.5 1a, enable, sense reel contact us sot-23 5l tj3964sf5 -3.3 1a, enable, sense reel contact us sot-23 5l tj3964gsf5 -3.3 1a, enable, sense reel contact us sot-223 3l tj3964s -3.3 1a reel contact us to-252 3l tj3964grs -3.3 -3l 1a reel contact us to-252 5l tj3964grs -3.3 -5l 1a, enable, sense reel contact us 3.3v sop-8 8l tj3964d -3.3 1a, enable, sense reel contact us
1a ultra low dropout linear regulator tj3964 dec. 2009 ? rev. 1.1 - 3 - htc ordering information (continued) package type root name product code tj 3964 output voltage : adj / 1.2 / 1.5 / 1.8 / 2.5 / 3.3 lead count : 3l / 5l (to-252 pkg only) * sf5 s rs d green mode g : halogen free blank : pb free : sot-23 5 : sot-223 : to-252 : sop-8 * it is written to distinguish the lead count of to-252 pkg
1a ultra low dropout linear regulator tj3964 dec. 2009 ? rev. 1.1 - 4 - htc pin configuration 3 2 1 sot-23 5l sop-8 8l sot-223 3l to-252 3l to-252 5l pin description sot-223 / to-252 3 lead sop-8 8 lead pin no. name function name function 1 v in input supply en chip enable 2 gnd ground v in input supply 3 v out output voltage v out output voltage 4 - - sense/adj remote sense or output adjust 5/ 6/ 7/ 8 - - gnd ground sot-23 5 lead to-252 5 lead pin no. name function name function 1 en chip enable en chip enable 2 gnd ground v in input supply 3 sense/adj remote sense or output adjust gnd ground 4 v out output voltage v out output voltage 5 v in input supply sense/adj remote sense or output adjust vout gnd (tab) vin sense/adj vout gnd (tab) vin en sense/adj gnd en vout vin en vin vout sense/adj gnd gnd gnd gnd vout gnd (tab) vin 3 2 1 4 5 1 8 2 7 3 6 4 5 3 2 1 5 4 3 2 1
1a ultra low dropout linear regulator tj3964 dec. 2009 ? rev. 1.1 - 5 - htc typical application typical 3 pin application c out 33uf c in 68uf v in v out tj3964 gnd input output typical 5 / 8 pin application c out 33uf c in 68uf en v in v out sense tj3964 gnd input output en 5 / 8 pin remote load sense application c in 68uf en v in v out sense tj3964 gnd input en c out 33uf l o a d output typical adjustable version application c out 33uf c in 68uf en v in v out adj tj3964 gnd input output en r2 r1 * tj3964 can deliver a continuous current of 1a 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 1a 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. + - + - + - + - + - + -
1a ultra low dropout linear regulator tj3964 dec. 2009 ? rev. 1.1 - 6 - htc electrical characteristics (note 1) limits in standard typeface are for t j =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 uf, c out = 33 uf, 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 < 1a v out +1 v < v in < 6 v -2 -3 0 2 3 % adjustable pin voltage (adj version) v adj 10 ma < i l < 1a 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 - 0.10 0.22 0.25 %/v load regulation (note 3, 4) v load 10 ma < i l < 1a - 0.25 0.55 0.60 % dropout voltage v drop i l = 1a - 350 450 550 mv i l = 100ma - 50 80 100 ground pin current (note 6) i gnd1 i l = 1a - 50 80 100 ua ground pin current (note 7) i gnd2 v en < 0.2 v - 50 80 100 ua output peak current i peak 1.4 1.2 1.6 - a thermal shutdown temperature t sd - 165 - thermal shutdown hysteresis t sd - 10 - logic low v il output = low - 0 0.3 * v in v enable threshold logic high v ih output = high 0.7 * 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 1a. 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.
1a ultra low dropout linear regulator tj3964 dec. 2009 ? rev. 1.1 - 7 - htc typical application characteristic ambient temperature vs. output voltage change output current vs. dropout voltage
1a ultra low dropout linear regulator tj3964 dec. 2009 ? rev. 1.1 - 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 resistor. the sum of r1 and r2 should be in range of 1k ? to 100k ? . c out 68uf c in 68uf en v in v out adj tj3964 gnd input output en r2 r1 ? ? ? ? ? ? ? = 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 tj3964 can provide better remote load regulation characteristics using the sense pin. tj3964 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 3964 regulates the voltage at the sense pin when the sense option pin is used. + - + -
1a ultra low dropout linear regulator tj3964 dec. 2009 ? rev. 1.1 - 9 - htc output capacitor the tj3964 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 maximum output current capability the tj3964 can deliver a continuous current of 1a over the full operating ju nction 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 applied package, the maximum output current of 1a may be still undeliverable due to the rest riction of the power dissipation of tj3964. 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 tj3964 is available in sot23-5, sot-223, to-252 and sop-8 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 as described in table 1, no he at 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.
1a ultra low dropout linear regulator tj3964 dec. 2009 ? rev. 1.1 - 10 - htc table. 1. 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 / sot23-5 ja-sot23-5 265 c/w thermal resistance junction-to-ambient / sop-8 ja-sop-8 165 c/w thermal resistance junction-to-ambient / sot223 ja-sot223 140 c/w thermal resistance junction-to-ambient / to252 ja-to252 105 c/w in case that there is no cooling solution and no heat sink / minimum copper plane area for heat sink, the maximum allowable power dissipation of each package is as follow; characteristic symbol rating unit maximum allowable power dissipation at t a =25c / sot23-5 p dmax-sot23-5 0.378 w maximum allowable power dissipation at t a =25c / sop-8 p dmax-sop-8 0.606 w maximum allowable power dissipation at t a =25c / sot223 p dmax-sot223 0.714 w maximum allowable power dissipation at t a =25c / to252 p dmax-to252 0.952 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 pl ane area, air flow is applied, the maximum allowable power dissipation could be increased. however, if the ambient temperature is increased, the allowable power dissipation would be decreased. for example, in case of sot-223 and to-252 package, ja-sot223 is 140 c/w and ja-to52 is 105 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 . junction to ambient thermal resistance, ja vs. 1 ounce copper area [sot-223 package] junction to ambient thermal resistance, ja vs. 2 ounce copper area [to-252 package]
1a ultra low dropout linear regulator tj3964 dec. 2009 ? rev. 1.1 - 11 - htc 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. 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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