iru1205(pbf iru1205-18 / iru1205-25 / iru1205-28 iru1205-30 / iru1205-33 / iru1205-36 1 rev. 2.3 www.irf.com description the iru1205 device is an efficient linear voltage regula- tor with better than 1% initial voltage accuracy, very low dropout voltage and very low ground current designed especially for hand held, battery powered applications. other features of the device are: ttl compatible enable/ shutdown control input, current limiting and thermal shut- down. the iru1205 is available in fixed and adjustable output voltage versions in a small sot-23 5-pin package. 300ma ultra low dropout positive adjustable and fixed regulators sot-23 package stable with 2.2 f ceramic capacitor 1% voltage reference accuracy only 270mv dropout at 300ma and 170mv dropout at 150ma 5 a quiescent current in shutdown current limit and thermal shutdown logic input enable pin typical application figure 1 - typical application of the iru1205 ajustable voltage regulator. figure 2 - typical application of the iru1205-25 fixed voltage regulator. data sheet no. pd94133reva applications laptop, notebook & palmtop computers battery powered equipments pcmcia vcc & vpp regulator consumer electronics high efficiency linear power supplies features v in v out r1 r2 c1 2.2uf c2 2.2uf sd enable 5 3 4 v out adj 2 1 v in gnd en 3.3v 2.5v c3 1000pf c1 2.2uf c2 2.2uf sd enable 5 3 4 v out c byp 2 1 v in gnd en vo = 1.25 3 1+ r1 r2 ( )
2 rev. 2.3 iru1205(pbf) iru1205-18 / iru1205-25 / iru1205-28 iru1205-30 / iru1205-33 / iru1205-36 www.irf.com package order information t j ( c) 5-pin sot-23 output sot-23 (l5) marking voltage 0 to 125 iru1205cl at00 adj 0 to 125 iru1205-18cl at18 1.8v 0 to 125 iru1205-25cl at25 2.5v 0 to 125 iru1205-28cl at28 2.8v 0 to 125 iru1205-30cl at30 3.0v 0 to 125 iru1205-33cl at33 3.3v 0 to 125 IRU1205-36CL at36 3.6v leadfree part basic part (non-lead free) t j ( c) 5-pin sot-23 output sot-23 (l5) marking voltage 0 to 125 iru1205clpbf at00 adj 0 to 125 iru1205-18clpbf at18 1.8v 0 to 125 iru1205-25cl pbf at25 2.5v 0 to 125 iru1205-28clpbf at28 2.8v 0 to 125 iru1205-30clpbf at30 3.0v 0 to 125 iru1205-33clpbf at33 3.3v 0 to 125 IRU1205-36CLpbf at36 3.6v
iru1205(pbf iru1205-18 / iru1205-25 / iru1205-28 iru1205-30 / iru1205-33 / iru1205-36 3 rev. 2.3 www.irf.com absolute maximum ratings input voltage (v in ) ..................................................... 10v enable input voltage ................................................. 10v storage temperature range ....................................... -65c to 150c operating junction temperature range ...................... 0c to 150c package information 5-pin sot-23 (l5) 5-pin sot-23 (l5) electrical specifications reference voltage (see table 1 for typical values) line regulation load regulation (note 1) dropout voltage (note 2) ground current (note 3) ground current-sd activated current limit thermal regulation adjust pin current enable pin input lo voltage enable pin input hi voltage enable pin input lo current enable pin input hi current ja =256 8 c/w ja =256 8 c/w unless otherwise specified, these specifications apply over c in =co=22 f, io=100 a, v in(min) =2.5v(adjustable devices) v in =vo + 1v(for fixed voltage devices), v out =v fb (for adjustable version only), c byp =470pf(for at18, at25, at28, at30, at33 and at36), v enb =2v and t a =25 8 c. typical values refer to t a =25 8 c. low duty cycle pulse testing is used which keeps junction and case temperatures equal to the ambient temperature. en adj gnd v in v out at00 adjustable 3 2 1 4 5 fixed en c byp gnd v in v out atxx 3 2 1 4 5 parameter sym test condition min typ max units (note 4) vo + 1v 4 rev. 2.3 iru1205(pbf) iru1205-18 / iru1205-25 / iru1205-28 iru1205-30 / iru1205-33 / iru1205-36 www.irf.com pin # pin symbol pin description the input pin of the regulator. typically a large storage capacitor is connected from this pin to ground to insure that the input voltage does not sag below the minimum drop out voltage during the load transient response. this pin must always be higher than v out by at least the amount of the dropout voltage and some margin in order for the device to regulate properly. ground pin. this pin must be connected to the lowest potential in the system and all other pins must be at higher potential with respect to this pin. enable pin. a low signal or left open on this pin shuts down the output. this pin must be tied hi or to v in for normal operation. a resistor divider from this pin to the v out pin and ground sets the output voltage. to minimize the error due to the error amplifier, select the values of the resistor dividers to be less than 10k ? . a 470 to 1000pf bypass capacitor connected to this pin reduces the output noise. the output of the regulator. a minimum of 2.2 f with max esr of 1 ? capacitor must be connected from this pin to ground to insure stability. 5-pin output sot-23 voltage iru1205 1.25v iru1205-18 1.8v iru1205-25 2.5v iru1205-28 2.8v iru1205-30 3.0v iru1205-33 3.3v iru1205-36 3.6v note 3: ground current is the regulator quiescent cur- rent plus the pass transistor current. the total current from the supply is the sum of the load current plus the ground pin current. note 4: the specification applies for the junction tem- perature of 0 to +125 8 c. note 1: low duty cycle pulse testing with kelvin con- nections is required in order to maintain accurate data. note 2: dropout voltage is defined as the minimum dif- ferential voltage between v in and v out required to main- tain regulation at v out . it is measured when the output voltage drops 1% below its nominal value. pin descriptions the output voltage of the adjustable device can be set using: where: r1 = resistor connected from output to the adj pin r2 = resistor connected from adj pin to gnd 1 2 3 4 4 5 v in gnd en adj (adjustable only) c byp (fixed only) v out table 1- nominal output voltage vs. part number. vo = 1.25 3 1+ r1 r2 ( )
iru1205(pbf iru1205-18 / iru1205-25 / iru1205-28 iru1205-30 / iru1205-33 / iru1205-36 5 rev. 2.3 www.irf.com block diagram figure 3 - iru1205 adjustable output block diagram. figure 4 - iru1205-18, iru1205-25, iru1205-28, iru1205-30, iru1205-33 and iru1205-36 fixed output block diagram. v in en thermal shutdown 1.25v v out adj gnd + 1 4 2 3 5 v in en thermal shutdown 1.25v v out c byp gnd + 1 4 2 3 5
6 rev. 2.3 iru1205(pbf) iru1205-18 / iru1205-25 / iru1205-28 iru1205-30 / iru1205-33 / iru1205-36 www.irf.com (l5) sot-23 package 5-pin symbol a a1 a2 b c d e e1 e e1 l min 0.90 0.00 0.90 0.25 0.09 2.80 2.60 1.50 0.35 0 8 max 1.45 0.15 1.30 0.50 0.20 3.00 3.00 1.75 0.55 10 8 0.95 ref 1.90 ref note: all measurements are in millimeters. c l e c e1 l b e d e1 a a2 a1
iru1205(pbf iru1205-18 / iru1205-25 / iru1205-28 iru1205-30 / iru1205-33 / iru1205-36 7 rev. 2.3 www.irf.com pkg desig l5 package description sot-23 parts per tube --- parts per reel 3000 package shipment method pin count 5 t & r orientation fig a feed direction figure a 1 1 1 ir world headquarters: 233 kansas st., el segundo, california 90245, usa tel: (310) 252-7105 tac fax: (310) 252-7903 visit us at www.irf.com for sales contact information data and specifications subject to change without notice. 5/2/2005
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