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LD1117a series low drop fixed and adjustable positive voltage regulators ? february 2002 block diagram to-252 (dpak) sot-223 n low dropout voltage (1.15v typ @ i out =1a, 25 o c) n very low quiescent current (5ma typ @ 25 o c) n output current up to 1a n fixed output voltage of: 1.8v, 2.5v, 2.85v, 3.3v, 5.0v n adjustable version availability (v ref =1.25v) n internal current and thermal limit n only 10 m f for stability n available in 2% (at 25 o c) and 4% in full temperature range n high supply voltage rejection : (80db typ at 25 c) n temperature range : 0 o c to 125 o c description the LD1117a is a low drop voltage regulator able to provide up to 1a of output current, available even in adjustable version (v ref =1.25v). concerning fixed versions, are offered the following output voltages: 1.8v, 2.5v, 2.85v, 3.3v and 5.0v. the 2.85v type is ideal for scsi-2 lines active termination. the device is supplied in: sot-223, dpak, to-220 the surface mount packages optimize the thermal characteristics even offering a relevant space saving effect. high efficency is assured by npn pass transistor. only a very common 10 m f minimum capacitor is needed for stability. only chip trimming allows the regulator to reach a very tight output voltage tolerance, within 2% at 25 c to-220 1/14
absolute maximum ratings symbol parameter value unit v in dc input voltage 10 v p tot power dissipation 12 w t stg storage temperature range -40 to 150 o c t op operating junction temperature range 0 to 125 o c absolute maximum ratings are those value beyond which damage to the device may occur. functional operation under these condition is not implied. over the above suggested max power dissipation a short circuit could definetively damage the device. thermal data symbol parameter to-220 sot-223 dpak unit r thj-case thermal resistance junction-case 3 15 8 o c/w r thj-amb thermal resistance junction-ambient 50 o c/w application circuit LD1117a series 2/14
connection diagram and ordering numbers (top view) sot-223 dpak to-220 output voltage LD1117as18tr LD1117as25tr LD1117as28tr LD1117as33tr LD1117as50tr LD1117adt18tr LD1117adt25tr LD1117adt28tr LD1117adt33tr LD1117adt50tr LD1117av18 LD1117av25 LD1117av28 LD1117av33 LD1117av50 1.8v 2.5v 2.85v 3.3v 5v LD1117ast-r LD1117adt-r LD1117av adjust able from 1.25 to 15v sot-223 dpak to-220 LD1117a series 3/14
electrical characteristics for LD1117a#18 (refer to the test circuits, t j = 0 to 125 o c, c o =10 m f, c i =10 m f unless otherwise specified) symbol parameter test conditions min. typ. max. unit v o output voltage v i = 3.8 v i o =10ma t j =25 o c 1.764 1.8 1.836 v v o output voltage i o = 0 to 1000 ma v i = 3.3 to 8 v 1.728 1.872 v d v o line regulation v i = 3.3 to 8 v i o =0 ma 1 6 mv d v o load regulation v i = 3.3 v i o = 0 to 1000 ma 1 10 mv d v o temperature stability 0.5 % d v o long term stability 1000 hrs t j = 125 o c0.3% v i operating input voltage i o = 100 ma 10 v i d quiescent current v i 8v i o =0ma 510ma i o output current v i -v o =5v t j =25 o c1000 ma en output noise voltage b = 10hz to 10khz t j =25 o c100 m v svr supply voltage rejection i o = 40 ma f = 120 hz v i -v o =3v v ripple = 1 vpp 60 80 db v d dropout voltage i o = 100 ma i o = 500 ma i o = 1000 ma 1 1.05 1.15 1.10 1.15 1.30 v v v d v o(pwr) thermal regulation t a =25 o c 30ms pulse 0.08 0.2 %/w electrical characteristics for LD1117a#25 (refer to the test circuits, t j = 0 to 125 o c, c o =10 m f, c i =10 m f unless otherwise specified) symbol parameter test conditions min. typ. max. unit v o output voltage v i = 4.5 v i o =10ma t j =25 o c 2.45 2.5 2.55 v v o output voltage i o = 0 to 1000 ma v i = 3.9 to 8 v 2.4 2.6 v d v o line regulation v i = 3.9 to 8 v i o =0 ma 1 6 mv d v o load regulation v i = 3.9 v i o = 0 to 1000 ma 1 10 mv d v o temperature stability 0.5 % d v o long term stability 1000 hrs t j = 125 o c0.3% v i operating input voltage i o = 100 ma 10 v i d quiescent current v i 10 v i o =0ma 510ma i o output current v i -v o =5v t j =25 o c 1000 1200 ma en output noise voltage b = 10hz to 10khz t j =25 o c100 m v svr supply voltage rejection i o = 40 ma f = 120 hz v i -v o =3v v ripple = 1 vpp 60 80 db v d dropout voltage i o = 100 ma i o = 500 ma i o = 1000 ma 1 1.05 1.15 1.10 1.15 1.30 v v v d v o(pwr) thermal regulation t a =25 o c 30ms pulse 0.08 0.2 %/w LD1117a series 4/14
electrical characteristics for LD1117a#28 (refer to the test circuits, t j = 0 to 125 o c, c o =10 m f, c i =10 m f unless otherwise specified) symbol parameter test conditions min. typ. max. unit v o output voltage v i = 4.85 v i o =10ma t j =25 o c 2.793 2.85 2.907 v v o output voltage i o = 0 to 1000 ma v i = 4.25 to 10 v 2.736 2.964 v d v o line regulation v i = 4.25 to 8 v i o =0ma 1 6 mv d v o load regulation v i = 4.25 v i o = 0 to 1000 ma 2 10 mv d v o temperature stability 0.5 % d v o long term stability 1000 hrs t j = 125 o c0.3% v i operating input voltage i o = 100 ma 10 v i d quiescent current v i 10 v i o =0ma 4.5 10 ma i o output current v i -v o =5v t j =25 o c 1000 1200 ma en output noise voltage b = 10hz to 10khz t j =25 o c100 m v svr supply voltage rejection i o = 40 ma f = 120 hz v i -v o =3v v ripple = 1 vpp 60 75 db v d dropout voltage i o = 100 ma i o = 500 ma i o = 1000 ma 1 1.05 1.15 1.10 1.15 1.30 v v v d v o(pwr) thermal regulation t a =25 o c 30ms pulse 0.08 0.2 %/w electrical characteristics for LD1117a#33 (refer to the test circuits, t j = 0 to 125 o c, c o =10 m f, c i =10 m f unless otherwise specified) symbol parameter test conditions min. typ. max. unit v o output voltage v i = 5.3 v i o =10ma t j =25 o c 3.234 3.3 3.366 v v o output voltage i o = 0 to 1000 ma v i = 4.75 to 10 v 3.168 3.432 v d v o line regulation v i = 4.75 to 8 v i o =0ma 1 6 mv d v o load regulation v i = 4.75 v i o = 0 to 1000 ma 1 10 mv d v o temperature stability 0.5 % d v o long term stability 1000 hrs t j = 125 o c0.3% v i operating input voltage i o = 100 ma 10 v i d quiescent current v i 10 v i o =0ma 510ma i o output current v i -v o =5v t j =25 o c 1000 1200 ma en output noise voltage b = 10hz to 10khz t j =25 o c100 m v svr supply voltage rejection i o = 40 ma f = 120 hz v i -v o =3v v ripple = 1 vpp 60 75 db v d dropout voltage i o = 100 ma i o = 500 ma i o = 1000 ma 1 1.05 1.15 1.10 1.15 1.30 v v v d v o(pwr) thermal regulation t a =25 o c 30ms pulse 0.08 0.2 %/w LD1117a series 5/14
electrical characteristics for LD1117a#50 (refer to the test circuits, t j = 0 to 125 o c, c o =10 m f, c i =10 m f unless otherwise specified) symbol parameter test conditions min. typ. max. unit v o output voltage v i =7 v i o =10ma t j =25 o c 4.955.1v v o output voltage i o = 0 to 1000 ma v i = 6.4 to 10 v 4.8 5.2 v d v o line regulation v i = 6.4 to 8 v i o =0 ma 1 6 mv d v o load regulation v i = 6.4 v i o = 0 to 1000 ma 1 10 mv d v o temperature stability 0.5 % d v o long term stability 1000 hrs t j = 125 o c0.3% v i operating input voltage i o = 100 ma 10 v i d quiescent current v i 10 v i o =0ma 510ma i o output current v i -v o =5v t j =25 o c 1000 1200 ma en output noise voltage b = 10hz to 10khz t j =25 o c100 m v svr supply voltage rejection i o = 40 ma f = 120 hz v i -v o =3v v ripple = 1 vpp 60 80 db v d dropout voltage i o = 100 ma i o = 500 ma i o = 1000 ma 1 1.05 1.15 1.10 1.15 1.30 v v v d v o(pwr) thermal regulation t a =25 o c 30ms pulse 0.08 0.2 %/w electrical characteristics for LD1117adj (refer to the test circuits, t j = 0 to 125 o c, c o =10 m f, c i =10 m f unless otherwise specified) symbol parameter test conditions min. typ. max. unit v o output voltage v i = 5.3 v i o =10ma t j =25 o c 1.225 1.25 1.275 v v o output voltage i o = 0 to 1000 ma v i = 2.75 to 10 v 1.2 1.3 v d v o line regulation v i = 2.75 to 10 v i o =0ma 1 6 mv d v o load regulation v i = 2.75 v i o = 0 to 1000 ma 1 10 mv d v o temperature stability 0.5 % d v o long term stability 1000 hrs t j = 125 o c0.3% v i operating input voltage i o = 100 ma 10 v i d quiescent current v i 8v i o =0ma 510ma i o output current v i -v o =5v t j =25 o c 1000 1200 ma en output noise voltage b = 10hz to 10khz t j =25 o c100 m v svr supply voltage rejection i o = 40 ma f = 120 hz v i -v o =3v v ripple = 1 vpp 60 80 db v d dropout voltage i o = 100 ma i o = 500 ma i o = 1000 ma 1 1.05 1.15 1.10 1.15 1.30 v v v d v o(pwr) thermal regulation t a =25 o c 30ms pulse 0.08 0.2 %/w LD1117a series 6/14
typical applications: figure 1: negative supply figure 2: active terminator for scsi-2 bus figure 3: circuit for increasing output voltage LD1117a series 7/14
typical applications (continued) : figure 4: voltage regulator with reference figure 5: battery backed-up regulated supply LD1117a series 8/14
typical applications (continued) : figure 6: post-regulated dual supply LD1117a series 9/14
LD1117a adjustable: application note the LD1117a adjustable has a thermal stabilized 1.25 0.012v reference voltage between the out and adj pins. i adj is 60 m a typ. (120 m a max.) and d i adj is 1 m a typ. (5 m a max.). r1 is normally fixed to 120 w . from figure 7 we obtain: v out =v ref +r2(i adj +i r1 )=v ref +r 2 (i adj +v ref /r1)=v ref (1 + r2 / r1) + r2 x i adj . in normal application r2 value is in the range of few kohm, so the r2 x i dj product could not be considered in the v out calculation; then the above expression becomes: v out =v ref (1 + r2 / r1). in order to have the better load regulation it is important to realize a good kelvin connection of r1 and r2 resistors. in particular r1 connection must be realized very close to out and adj pin, while r2 ground connection must be placed as near as possible to the negative load pin. ripple rejection can be improved by introducing a 10 m f electrolitic capacitor placed in parallel to the r2 resistor (see figure 7: adjustable output voltage application circuit figure 8: adjustable output voltage application with improved ripple rejection LD1117a series 10/14
dim. mm inch min. typ. max. min. typ. max. a 4.40 4.60 0.173 0.181 c 1.23 1.32 0.048 0.051 d 2.40 2.72 0.094 0.107 d1 1.27 0.050 e 0.49 0.70 0.019 0.027 f 0.61 0.88 0.024 0.034 f1 1.14 1.70 0.044 0.067 f2 1.14 1.70 0.044 0.067 g 4.95 5.15 0.194 0.203 g1 2.4 2.7 0.094 0.106 h2 10.0 10.40 0.393 0.409 l2 16.4 0.645 l4 13.0 14.0 0.511 0.551 l5 2.65 2.95 0.104 0.116 l6 15.25 15.75 0.600 0.620 l7 6.2 6.6 0.244 0.260 l9 3.5 3.93 0.137 0.154 dia. 3.75 3.85 0.147 0.151 l6 a c d e d1 f g l7 l2 dia. f1 l5 l4 h2 l9 f2 g1 to-220 mechanical data p011c LD1117a series 11/14
dim. mm mils min. typ. max. min. typ. max. a 2.27 2.3 2.33 89.4 90.6 91.7 b 4.57 4.6 4.63 179.9 181.1 182.3 c 0.2 0.4 0.6 7.9 15.7 23.6 d 0.63 0.65 0.67 24.8 25.6 26.4 e1 1.5 1.6 1.7 59.1 63 66.9 e4 0.32 12.6 f 2.9 3 3.1 114.2 118.1 122.1 g 0.67 0.7 0.73 26.4 27.6 28.7 l1 6.7 7 7.3 263.8 275.6 287.4 l2 3.5 3.5 3.7 137.8 137.8 145.7 l 6.3 6.5 6.7 248 255.9 263.8 c c be l a b e1 l1 f g c d l2 e4 p008b sot-223 mechanical data LD1117a series 12/14
dim. mm inch min. typ. max. min. typ. max. a 2.2 2.4 0.086 0.094 a1 0.9 1.1 0.035 0.043 a2 0.03 0.23 0.001 0.009 b 0.64 0.9 0.025 0.035 b2 5.2 5.4 0.204 0.212 c 0.45 0.6 0.017 0.023 c2 0.48 0.6 0.019 0.023 d 6 6.2 0.236 0.244 e 6.4 6.6 0.252 0.260 g 4.4 4.6 0.173 0.181 h 9.35 10.1 0.368 0.397 l2 0.8 0.031 l4 0.6 1 0.023 0.039 == d l2 l4 13 == b e == b2 g 2 a c2 c h a1 detail oao a2 detail oao to-252 (dpak) mechanical data 0068772-b LD1117a series 13/14
information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specification mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics products are not authorized for use as critical components in life support devices or systems withoutexpress written approval of stmicroelectronics. the st logo is a registered trademark of stmicroelectronics ? 2002 stmicroelectronics printed in italy all rights reserved stmicroelectronics group of companies australia - brazil - china - finland - france - germany - hong kong - india - italy - japan - malaysia - malta - morocco singapore - spain - sweden - switzerland - united kingdom - u.s.a. http://www.st.com . LD1117a series 14/14

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