iru1117-18(pbf) 1 rev. 1.4 www.irf.com typical application description the iru1117-18 is a low dropout three-terminal fixed out- put regulator with minimum of 800ma output current ca- pability. this product is specifically designed to provide well regulated supply for low voltage ic applications as well as generating clock supply for pc applications. the iru1117-18 is guaranteed to have <1.2v dropout at full load current making it ideal to provide well regulated with 3.8v input supply. the iru1117-18 is specifically de- signed to be stable with low cost aluminum capacitors while maintaining stability with low esr tantalum caps. 800ma low dropout positive fixed 1.8v regulator figure 1 - typical set-up of the iru1117-18 in a 3.3v to 1.8v regulator application. data sheet no. pd94137reva features guaranteed < 1.2v dropout at 800ma load current fast transient response 1% voltage reference initial accuracy built-in thermal shutdown available in sot-223, d-pak, ultra thin-pak tm and 8-pin soic surface-mount packages applications low voltage ic supply applications pc clock supply voltage 3.3v 1.8v / 800ma c1 10uf c2 10uf iru1117-18 3 1 2 v in v out gnd package order information t j ( c) 2-pin plastic 2-pin plastic 8-pin plastic 3-pin plastic to-252 (d-pak) ultra thin-pak tm (p) soic (s) sot-223 (y) 0 to 125 IRU1117-18CD iru1117-18cp iru1117-18cs iru1117-18cy t j ( c) 2-pin plastic 2-pin plastic 8-pin plastic 3-pin plastic to-252 (d-pak) ultra thin-pak tm (p) soic (s) sot-223 (y) 0 to 125 not available not available iru1117-18cspbf not available leadfree part basic part (non-lead free)
2 rev. 1.4 iru1117-18(pbf) www.irf.com absolute maximum ratings input voltage (v in ) .................................................... 7v power dissipation ..................................................... internally limited storage temperature range ...................................... -65c to 150c operating junction temperature range ..................... 0c to 125c package information 2-pin plastic to-252 (d-pak) 2-pin ultra thin-pak tm (p) 8-pin plastic soic (s) 3-pin plastic sot-223 (y) unless otherwise specified, these specifications apply over c in =1 f, v in =5v, c out =10 f, and t j =0 to 125 8 c. typical values refer to t j =25 8 c. electrical specifications note 1: low duty cycle pulse testing with kelvin connections is required in order to maintain accurate data. note 2: dropout voltage is defined as the minimum differential voltage between v in and v out required to maintain regulation at v out . it is measured when the output voltage drops 1% below its nominal value. output voltage line regulation load regulation (note 1) dropout voltage (note 2) current limit thermal regulation ripple rejection temperature stability long term stability rms output noise parameter sym test condition min typ max units io=10ma, t j =25 8 c io=10ma io=10ma, 4.75v iru1117-18(pbf) 3 rev. 1.4 www.irf.com pin descriptions ground pin. this pin must be connected to ground plane using a low inductance short connection. the output of the regulator. this pin is also connected to the tab of the package. an output capacitor must be connected to this pin to insure stability of the regulator. 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 dropout voltage during the load transient response. this pin must always be 1.3v higher than v out in order for the device to regulate properly. block diagram figure 2 - simplified block diagram of the iru1117-18. pin# pin symbol pin description 1 2 3 gnd v out v in v in 3 1 gnd 2 v out thermal shutdown current limit 1.25v + + 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. 02/01
4 rev. 1.4 iru1117-18(pbf) www.irf.com (d) to-252 package 2-pin symbol a b c d e f g h j k l m n o p q r r1 s min 6.477 5.004 0.686 7.417 9.703 0.635 4.521 & 1.52 2.184 0.762 1.016 5.969 1.016 0 0.534 0.428 max 6.731 5.207 0.838 8.179 10.084 0.889 4.623 & 1.62 2.388 0.864 1.118 6.223 1.118 0.102 0.686 0.588 note: all measurements are in millimeters. a b c d f g h 45 8 k m q 7 8 n p r s r1 l c e j l o r0.31 typ r0.51 typ 2.286 bsc
iru1117-18(pbf) 5 rev. 1.4 www.irf.com (p) ultra thin-pak tm 2-pin note: all measurements are in millimeters. symbol a a1 b c d e g g1 h k l m n p r u v min 5.91 5.54 6.02 1.70 0.63 0.17 2.16 4.45 9.42 0.76 0.02 0.89 0.25 0.94 2 8 2.92 max 6.17 5.79 6.27 2.03 0.79 0.33 2.41 4.70 9.68 1.27 0.13 1.14 0.25 1.19 6 8 3.30 5.08 nom a e m l n u c b k p v h g d r l c a1 g1
6 rev. 1.4 iru1117-18(pbf) www.irf.com (s) soic package 8-pin surface mount, narrow body symbol a b c d e f g h i j k l t min 4.80 0.36 3.81 1.52 0.10 0.19 5.80 0 8 0.41 1.37 max 4.98 0.46 3.99 1.72 0.25 0.25 6.20 8 8 1.27 1.57 1.27 bsc 0.53 ref 7 8 bsc 8-pin note: all measurements are in millimeters. pin no. 1 i k h detail-a detail-a 0.38 6 0.015 x 45 8 t g f d a b c e l j
iru1117-18(pbf) 7 rev. 1.4 www.irf.com (y) sot-223 package 3-pin symbol a a1 b b1 c d e e e1 h q q1 q2 s t min 1.498 0.02 2.895 0.637 0.239 6.299 3.30 2.209 4.496 6.70 0 8 7 8 7 8 0.838 1.092 max 1.702 0.11 3.15 0.85 0.381 6.706 3.708 2.953 4.699 7.30 10 8 16 8 16 8 1.05 1.30 note: all measurements are in millimeters. e s b1 a1 q q1 q2 c h e1 a t d b e
8 rev. 1.4 iru1117-18(pbf) www.irf.com 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 pkg desig d p s y package description to-252, (d-pak) ultra thin-pak tm soic, narrow body sot-223 parts per tube 75 75 95 80 parts per reel 2500 2500 2500 2500 package shipment method pin count 2 2 8 3 t & r orientation fig a fig b fig c fig d feed direction figure a 1 1 1 feed direction figure c feed direction figure b feed direction figure d 1 1 1 1 1 1 1 1 1
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