300ma ultra low dropout linear regulator tj4203 apr. 2011 ? rev.1.0 1/10 htc features ? ultra low dropout voltage ? compatible with low esr ml cc as input/output capacitor ? good line and load regulation ? guaranteed output current of 300ma ? available in sot23-5l, dfn2x2-6l and sc70-5l ? fixed output voltages : 1.0v, 1.2v, 1.8v, 2.5v, and 3.3v ? sense option improves load regulation ? over-temperature/over-current protection ? -40 oc to 125 oc junction temperature range application ? lcd tvs and settop boxes ? battery powered equipments ? motherboards and graphic cards ? microprocessor power supplies ? peripheral cards ? high efficiency linear regulators ? battery chargers description the tj4203 series of high performance ultra-low dropout linear regulators operates from 2.5v to 6v input supply and provides ultra-low dropout volt age, 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 tj4203 is developed on a cmos process technology which allows low quiescent current operation independent of output load current. this cmos process also allows the tj4203 to operate under extremely low dropout conditions. sot23-5l dfn2x2-6l sc70-5l ordering information device package tj4203gsf5-adj sot23-5l tj4203gsf5-x.x tj4203gq-adj dfn2x2-6l tj4203gq-x.x tj4203gtf5-adj sc70-5l tj4203gtf5-x.x x.x = output voltage = 1.0, 1.2, 1.8, 2.5, and 3.3 absolute maximum ratings characteristic symbol min. max. unit input supply voltage (survival) v in - 6.5 v enable input voltage (survival) v en - 6.5 v maximum output current i max - 300 ma lead temperature (soldering, 5 sec) t sol 260 oc storage temperature range t stg -65 150 oc operating junction temperature range t jopr -40 125 oc
300ma ultra low dropout linear regulator tj4203 apr. 2011 ? rev.1.0 2/10 htc ordering information v out package order no. description package marking status adj sot23-5l tj4203gsf5-adj 300ma, adjustable, enable 03gad contact us dfn2x2-6l tj4203gq-adj 300ma, adjustable, enable 03gad contact us sc70-5l tj4203gtf-adj 300ma, adjustable, enable 03gad contact us 1.0v sot23-5l tj4203gsf5-1.0 300ma, enable 03g10 contact us dfn2x2-6l tj4203gq-1.0 300ma, enable 03g10 contact us sc70-5l tj4203gtf-1.0 300ma, enable 03g10 contact us 1.2v sot23-5l tj4203gsf5-1.2 300ma, enable 03g12 contact us dfn2x2-6l tj4203gq-1.2 300ma, enable 03g12 contact us sc70-5l tj4203gtf-1.2 300ma, enable 03g12 contact us 1.8v sot23-5l tj4203gsf5-1.8 300ma, enable 03g18 contact us dfn2x2-6l tj4203gq-1.8 300ma, enable 03g18 contact us sc70-5l tj4203gtf-1.8 300ma, enable 03g18 contact us 2.5v sot23-5l tj4203gsf5-2.5 300ma, enable 03g25 contact us dfn2x2-6l tj4203gq-2.5 300ma, enable 03g25 contact us sc70-5l tj4203gtf-2.5 300ma, enable 03g25 contact us 3.3v sot23-5l tj4203gsf5-3.3 300ma, enable 03g33 contact us dfn2x2-6l tj4203gq-3.3 300ma, enable 03g33 contact us sc70-5l tj4203gtf-3.3 300ma, enable 03g33 contact us material class g : halogen free root name product code t j 4 2 0 3 package type sf5 : sot23-5l q : dfn2x2-6l tf: sc70-5l output voltage : adj / 1.2v / 1.8v / 2.5v / 3.3v / 5.0v
300ma ultra low dropout linear regulator tj4203 apr. 2011 ? rev.1.0 3/10 htc pin configuration 4 1 5 3 2 vin gnd en vout sense/adj sense/adj top view 1 2 3 6 5 4 gnd en vout nc vin sot23-5l dfn2x2-6l sc70-5l pin description pin no. sot23-5l / sc70-5l dfn2x2-6l name function name function 1 v in input supply sense/adj remote sense or output adjust 2 gnd ground gnd ground 3 en chip enable en chip enable 4 sense/adj remote sense or output adjust v in input supply 5 v out output voltage nc no internal connection 6 - - v out output voltage
300ma ultra low dropout linear regulator tj4203 apr. 2011 ? rev.1.0 4/10 htc basic application typical 5 pin application 5 pin remote load sense application c in 1uf en v in v out sense tj4203 gnd vin en c out 1uf l o a d vout typical adjustable version application c out 2.2uf c in 1uf en v in v out adj tj4203 gnd vin vout en r2 r1 c ff * tj4203 can deliver a continuous current of 300ma over the fu ll operating temperature. however, the output current is limited by the restriction of power dissipation which diff ers from packages. a heat sink may be required depending on the maximum power dissipation and maximum ambient temper ature of application. with respect to the applied package, the maximum output current of 300ma may be still undeliverable. * see application information. c out 1uf c in 1uf en v in v out sense tj4203 gnd vin vout en
300ma ultra low dropout linear regulator tj4203 apr. 2011 ? rev.1.0 5/10 htc electrical characteristics (note 1) limits in standard typeface are for tj=25oc, 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 = 1 uf, c out = 1 uf, v en = v in - 0.3 v parameter symbol test condit ion min. typ. max. unit output voltage tolerance v o v out +1 v < v in < 5.5 v -2 -3 0 2 3 % adjustable pin voltage (adj version) v adj 2.5 v < v in < 5.5 v 0.784 0.776 0.8 0.816 0.824 v line regulation (note 3) v line v out +1 v < v in < 5.5 v - 0.15 - 0.40 %/v load regulation (note 3, 4) v load 10 ma < i l < 300m a - 0.10 0.25 0.40 % dropout voltage (note 5) v drop i l = 30 ma - 30 45 55 mv i l = 300 ma - 300 400 500 ground pin current (note 6) i gnd i l = 30 ma - 0.10 0.15 0.20 ma i l = 300 ma - 0.15 0.20 0.25 ground pin current (note 7) i gnd_off v en < 0.2 v - 0.5 1 2 ua power supply rejection ratio psrr f = 1khz - 55 - db f = 1khz, c ff = 0.1uf - 60 - thermal shutdown temperature t sd - - 165 - oc enable threshold logic low v il output = low - - 0.4 v logic high v ih output = high 2.0 - - v enable input current i en v en = v in - 0.1 - 1 ua over current limit i limit - 500 - - ma 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 10ms curr ent pulse. devices are tested for load regu lation in the load range from 10ma to 300ma. 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.
300ma ultra low dropout linear regulator tj4203 apr. 2011 ? rev.1.0 6/10 htc application information introduction tj4203 is intended for applications where high current capability and very low dropout voltage are required. it provides a simple, low cost solution that occupies very little pcb estate. additional features include an enable pin to allow for a very low power consumption standby mode, an adjustable pin to provide a fully adjustable output voltage, and sense pin to provide better remote load regulation characteristics. component selection input capacitor : a minimum of 1uf ceramic capacitor is reco mmended to be placed directly next to the v in pin. it allows for the device being some distance from any bulk capacito r on the rail. additionally, input droop due to load transients is reduced, improving load transient resp onse. additional capacitance may be added if required by the application.(see fig.1) output capacitor : a minimum ceramic capacitor over than 1uf should be very closely placed to the output voltage pin of the tj4203. increasing capacitance will improve t he overall transient response and stability. decoupling (bypass) capacitor : in very electrically noisy environments, it is reco mmended that additional ceramic capacitors be placed from vin to gnd. the use of multiple lower value ceramic capaci tors in parallel with output capacitor also allows to achieve better transient performance and stabilit y if required by the application.(see fig.1) feed-forward capacitor to get the higher psrr than the inher ent performance of tj4203, it is recommended that additional ceramic feed-forward capacitor be placed from vout pin to adj pi n. the capacitance of feed-forward capacitor with range of 1nf to 100nf allows to achieve better psrr perfo rmance when required by the application. in this case, over than 2.2uf output capacitor should be plac ed to the output voltage pin of the tj4203.(see fig.2) c out 1uf en v in v out sense tj4203 gnd vin vout r p cc2 c in 1uf cc1 c out 2.2uf c in 1uf en v in v out adj tj4203 gnd vin vout r2 r1 r p cc2 cff cc1 fig. 1. application with decoupling capacitor, fig. 2. application with feed-forward capacitor, cc1 & cc2 cff delayed start-up when power sequence control is required or rising time of input supply voltage is over than 100usec, it is recommended to apply delayed start-up by using cdelay as shown in fig. 3. it can adjust proper delay by rp-cdelay time constant. and also it can prevent any unexpected transient characteristics at output voltage when the rising time of input supply voltage is as long as 100usec or longer. c out 2.2uf c in 1uf en v in v out adj tj4203 gnd vin vout r2 r1 r p cff cdelay fig. 3. application with delayed start-up
300ma ultra low dropout linear regulator tj4203 apr. 2011 ? rev.1.0 7/10 htc output adjustment (adjustable version) an adjustable output device has output voltage range of 0.8v to 5.0v. the operating condition of v in and the operating characteristics of v out depend on the dropout voltage performance in accordance with output load current. to obtain a desired output vo ltage, the following equation can be used with r1 resistor range of 100 ? to 50k ? . c out 2.2uf c in 1uf en v in v out adj tj4203 gnd vin vout r2 r1 cff en ? ? ? ? ? ? ? ? 1 8 0 1 2 . v r r out fig. 4. application for adjustable output voltage to enhance output stability, a feed-forward capacito r of 10nf to 1uf can be placed in series with v out and adj.(refer to "component selection" section) sense pin in applications where the regulator output is not very close to the load, the tj4203 can provide better remote load regulation characteristics using the sense pin. tj4203 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 4203 regulates the voltage at the sense pin when the sense option pin is used. fig. 5. conventional linear regulator applicatio n fig.6. remote load sense application maximum output current capability the tj4203 can deliver a continuous current of 300ma 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 t he applied package, the maximum output current of 300ma may be still undeliverable due to the restriction of the power dissipation of tj4203. 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
300ma ultra low dropout linear regulator tj4203 apr. 2011 ? rev.1.0 8/10 htc 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 resistance 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
300ma ultra low dropout linear regulator tj4203 apr. 2011 ? rev.1.0 9/10 htc typical operating characteristics test circuit vin en vout adj gnd r2 r1 vin vout 2.2uf 1uf cff 10k c delay case 1 ( vin = 3.3v, vout = 2.5v ) vin : 2.0v/div, vout : 1.0v/div, time : 500ms/div vin : 2.0v/div, vout : 1.0v/div, time : 500ms/div start up @ iout=0a (cff=10nf, r2=51k ? , r1=24k ? ) start up @ iout=300ma (cff=10nf, r2=51k ? , r1=24k ? ) vin : 1.0v/div, vout : 1.0v/div, time : 50ms/div vin : 1.0v/div, vout : 1.0v/div, time : 50ms/div start up @ iout=0a (cff=1uf, r2=51k ? , r1=24k ? ) start up @ iout=300ma (cff=1uf, r2=51k ? , r1=24k ? )
300ma ultra low dropout linear regulator tj4203 apr. 2011 ? rev.1.0 10/10 htc vin : 1.0v/div, vout : 1.0v/div, time : 50ms/div vin : 2.0v/div, vout : 2.0v/div, time : 5ms/div start up @ iout=300ma (cff is varied, r2=51k ? , r1=24k ? ) start up @ iout=10ma (cff is varied, r2=51k ? , r1=24k ? ) vin : 20mv/div, iout : 300ma/div, time : 500us/div vin : 20mv/div, iout : 300ma/div, time : 500us/div load transient response (cff =10nf, r2=51k ? , r1=24k ? ) load transient response (cff =10nf, r2=51k ? , r1=24k ? ) vin : 1v/div, ven: 1v/div, vout : 1v/div, time : 1ms/div vin : 1v/div, ven: 1v/div, vout : 1v/div, time : 1ms/div start up @ iout=0a (cff=10nf, r2=51k ? , r1=24k ? ) start up @ iout=300ma (cff=10nf, r2=51k ? , r1=24k ? )
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