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november 2008 rev 4 1/18 18 st715xx st715xx25 - st715xx33 high input voltage - 85 ma ldo linear regulator features 2.5 v to 24 v input voltage low dropout voltage (500 mv typ. at 85 ma) very low quiescent current (3.8 a typ. at full load) 85 ma guaranteed output current output voltage: fixed or adjustable compatible with cerami c output capacitors from 0.47 f to 10 f internal current limit package dfn8 (3x3 mm), sot23-5l temperature range: -40 c to 125 c description the st715xx is a high voltage, ultra low quiescent low drop linear regulator capable of providing an output current in excess of 85 ma. the device operates over an input voltage range spanning from 2.5 v to 24 v, and is also stable with output ceramic capacitors. fault condition protection includes short-circuit current limitation. the ultra low quiescent current of 3.8 a at full load makes it highly suitable for low power applications and battery powered systems. typical applications are mobile phones, personal digital assistant (pdas), cordless phones and similar battery powered systems. the wide input voltage range makes the st715xx an ideal solution for low power industrial applications also.the st715xx is available in the dfn8 (3x3 mm) 8 leads or the sot23-5. dfn8 (3x3 mm) sot23-5l table 1. device summary order codes output voltage sot23-5l marking dfn8 (3x3 mm) marking st715mr 71ad st715pur 715ad adj st715m15r (1) 7115 st715pu15r (1) 71515 1.5 v st715m18r (1) 7118 st715pu18r (1) 71518 1.8 v st715m25r 7125 st715pu25r (1) 71525 2.5 v st715m28r (1) 7128 st715pu28r (1) 71528 2.8 v st715m33r (1) 7133 ST715PU33R 71533 3.3 v 1. available on request. www.st.com
contents st715xx - st715xx25 - st715xx33 2/18 contents 1 diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 output voltage selection for adj ustable version . . . . . . . . . . . . . . . . . . 8 5.1 external capacitor requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5.2 power dissipation and junction temperature . . . . . . . . . . . . . . . . . . . . . . . . 8 6 typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7 typical performance characteristi cs . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 8 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 9 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
st715xx - st715xx25 - st715xx33 diagram 3/18 1 diagram figure 1. block diagram
pin configuration st715xx - st715xx25 - st715xx33 4/18 2 pin configuration figure 2. pin connections (top view) dfn8 (3x3) sot23-5l table 2. pin description (dfn8 3x3 mm) symbol pin for fixed pin for adjustable name and function in 1 1 input voltage of the ldo nc 2, 3, 5, 7, exp. pad 2, 3, 6, 7, exp. pad not internally connected gnd 4 4 common ground fb - 5 feedback pin out 8 8 output voltage table 3. pin description (sot23-5l) symbol pin for fixed pin for adjustable name and function in 4 4 input voltage of the ldo nc 3 1, 3 not internally connected gnd 2 2 common ground fb 1 feedback pin out 5 5 output voltage
st715xx - st715xx25 - st 715xx33 maximum ratings 5/18 3 maximum ratings note: absolute maximum ratings are the values beyond which damage to the device may occur. functional operation under these conditions is not implied. table 4. absolute maximum ratings symbol parameter value unit v in dc input voltage from -0.3 to 26 v v out dc output voltage from -0.3 to v in +0.3 v i out continuous output current dfn package according to package power dissipation a continuous output current sot23-5 package according to package power dissipation v esd esd ratings 2 kv p d power dissipation dfn package = 5 w power dissipation sot23-5 package = 1 t stg storage temperature range -65 to 150 c t op operating junction temperature range -40 to 125 c table 5. thermal data symbol parameter sot23-5l dfn8 unit r thja thermal resistance junction-ambient 255 52 c/w
electrical characteristics st715xx - st715xx25 - st715xx33 6/18 4 electrical characteristics note: 1 for v out(nom) < 2 v, v in = 2.5 v. 2 dropout voltage is the input-to-output voltage difference at which the output voltage is 100 mv below its nominal value. this specification does not apply for output voltages below 2 v. 3 turn-on time is time measured between the input just exceeding 90% of its final value and the output voltage just reaching 95 % of its nominal value. 4 guaranteed by design. table 6. electrical characteristics - adjustable version (t j = 25 c, v in = v out(nom) + 1 v, c in = 0.1 f, c out = 1 f, i out = 1 ma, unless otherwise specified) ( note 1 ) symbol parameter test conditions min. typ. max. unit v in operating input voltage i out = 85ma 2.5 24 v v out output voltage range 1.2 v i out output current v in =2.5 to 6v, t j =-40c to 125c 85 ma v fb feedback voltage 1.2 v v fb accuracy ( note 1 ) v in =v out +1 to 24v, i out =1ma to 85ma, t j =-40c to 125c -4.0 4.0 % v out line regulation v in =v out +1 to 24v, i out =1ma, t j =-40c to 125c 0.001 0.004 %/v v out load regulation i out =1ma to 85ma, t j =-40c to 125c 0.002 0.004 %/ma e n output noise voltage ( note 4 ) 200hz to 100khz, i out = 50ma, c out = 10f, t j =-40c to 125c, v out =1.2v 95 v rms svr supply voltage rejection v in =v outnom +1v+/-v ripple, v ripple =0.2v, i out = 1ma, c out = 10f f=1khz 45 db t j =-40c to 125c f=100khz 62 i q quiescent current i out =0ma to 85ma, t j =-40c to 125c 4.5 a i out =0ma to 85ma, v in =24v t j =-40c to 125c 5.5 i sc short circuit current v out =0, t j =-40c to 125c v in =3.8v 120 ma t on turn on time ( note 3 ) v in =4.2v, c out = 10f, i out =60ma, t j =-40c to 125c 0.7 ms c out output capacitor capaci tance f = 100khz 0.47 f
st715xx - st715xx25 - st715xx3 3 electrical characteristics 7/18 note: 1 for v out(nom) < 2 v, v in = 2.5 v. 2 dropout voltage is the input-to-output voltage difference at which the output voltage is 100 mv below its nominal value. this specification does not apply for output voltages below 2 v. 3 turn-on time is time measured between the input just exceeding 90 % of its final value and the output voltage just reaching 95% of its nominal value. 4 guaranteed by design. table 7. electrical characteristics - fixed version (t j = 25 c, v in = v out(nom) + 1 v, c in = 0.1 f, c out = 1 f, i out = 1 ma, v out = 3.3 v unless otherwise specified) ( note 1 ) symbol parameter test conditions min. typ. max. unit v in operating input voltage i out = 85ma, t j =-40c to 125c v out +v dro ptyp 24 v i out output current v in =4.3 to 24v, t j =-40c to 125c 0 85 ma v out v out total accuracy ( note 1 ) v in =v out +1 to 24v, i out =0 to 85ma, t j =-40c to 125c -5 +5 % v out line regulation v in =4.3 to 24v, i out =1ma, t j =-40c to 125c 0.001 0.004 %/v v out load regulation i out =100a to 85ma, t j =-40c to 125c 0.002 0.003 %/ma v drop drop output voltage ( note 2 ) i out =85ma, t j =-40c to 125c 500 1000 mv e n output noise voltage ( note 4 ) 200hz to 100khz, i out = 50ma, c out = 10f, t j =-40c to 125c 210 v rms svr supply voltage rejection v in =v outnom +1v+/-v ripple, v ripple =0.2v, i out =1ma, c out = 10f f=1khz 38 db t j =-40c to 125c f=100khz 57 i q quiescent current i out =0ma to 85ma, t j =-40c to 125c 3.75 4.5 a v in =24v 4.15 5.5 i sc short circuit current v out =0, t j =-40c to 125c v in =3.8v 120 ma t on turn on time ( note 3 ) v in =4.2v, c out = 10f, i out =60ma, t j =-40c to 125c 0.7 ms c out output capacitor capaci tance f = 100khz 0.47 f
output voltage selection for adjustable version st715xx - st715xx25 - st715xx33 8/18 5 output voltage selection for adjustable version the st715xx features an adjustable output voltage using two external resistors connected as a voltage divider to the fb pin as shown in the typical application circuit figure 4 . the output voltage is set using the following equation: v out = v fb (1 + r 1 /r 2 ) where typically v fb = 1.2 v. choose r 2 5 k in order to optimize quiescent current, accuracy, and high-frequency power-supply rejection. to simplify resistor selection use the following equation: r 1 = r 2 x (v out /v fb - 1) 5.1 external capacitor requirements a 0.1 f or larger input bypass capacitor, connected between in and gnd and located close to the device, is recommended to improve transient response and noise rejection of the power supply as a whole. a higher-value input capacitor may be necessary if large, fast- rise-time load transients will be present in the applicat ion and if the device is located several inches away from the power source. the st715xx requires an out put capacitor connec ted between out and gnd to stabilize the internal control loop. any capacitor (including ceramic and tantalum) with a value higher than 0.47 f will properly stabilize this loop. 5.2 power dissipation and junction temperature to ensure reliable operation, worst-case junction temperature should not exceed 125 c. this restriction limits the power dissipation the regulator can handle in any given application. to ensure that the junction temperature is within acceptable limits, calculate the maximum allowable dissipation, p d(max) , and the actual dissipation, p d , which must be less than or equal to p d(max) . the maximum power dissipation limit is determined using the following equation: p d(max) = (t jmax - t a ) / r thja where: t jmax is the maximum allowable junction temperature. r thja is the thermal resistance junction-to-ambient for the package. t a is the ambient temperature. the regulator dissipation is calculated using the following equation: p d = (v in - v out ) x i out power dissipation resulting from quiescent current is negligible. the st715xx features internal current limiting. during normal operation, it limits output current to approximately 350 ma. when current limiting engages, the output voltage scales back linearly until the overcurrent condition ends. take care not to exceed the power dissipation ratings of the package.
st715xx - st715xx25 - st71 5xx33 typical application 9/18 6 typical application figure 3. application ci rcuit for fixed version figure 4. application circuit for adjustable version
typical performance characteristics st715xx - st715xx25 - st715xx33 10/18 7 typical performance characteristics figure 5. output voltage vs temperature figure 6. output voltage vs input voltage figure 7. dropout voltage vs output current figure 8. c out stability region figure 9. supply voltage rejection vs frequency figure 10. output noise voltage vs frequency v in =v out(nom) +1v 3.15 3.2 3.25 3.3 3.35 3.4 3.45 3.5 -50 0 50 100 150 temp [c] v out [v] i out =1ma i out =85ma v in =v out(nom) +1v 3.15 3.2 3.25 3.3 3.35 3.4 3.45 3.5 -50 0 50 100 150 temp [c] v out [v] i out =1ma i out =85ma v in =v out(nom) +1v 0 0.5 1 1.5 2 2.5 3 3.5 0123456 v in [v] v out [v] v in =v out(nom) +1v 0 0.5 1 1.5 2 2.5 3 3.5 0123456 v in [v] v out [v] 0 200 400 600 800 1000 0 20 40 60 80 100 i out [a] v dropout [v] 0 200 400 600 800 1000 0 20 40 60 80 100 i out [a] v dropout [v] c in =0.1f, v in =v en =2.5 to 24v i out =1ma to 0.085a 0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 0.47 1 4.7 10 c out [f] (nominal value) esr @ 100 khz [ohm] stability region c in =0.1f, v in =v en =2.5 to 24v i out =1ma to 0.085a 0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 0.47 1 4.7 10 c out [f] (nominal value) esr @ 100 khz [ohm] stability region i out =1ma, v ripple =0.2v pp , v out =1.2v 30 35 40 45 50 55 60 100 1000 10000 100000 freq [hz] svr [db] i out =1ma, v ripple =0.2v pp , v out =1.2v 30 35 40 45 50 55 60 100 1000 10000 100000 freq [hz] svr [db] i out =50ma, v in =2.5v, v out =1.2v 0 100 200 300 400 500 600 700 1000 10000 100000 freq [hz] nv/ hz] i out =50ma, v in =2.5v, v out =1.2v 0 100 200 300 400 500 600 700 1000 10000 100000 freq [hz] nv/ hz]
st715xx - st715xx25 - st715xx33 typical performance characteristics 11/18 figure 11. quiescent current vs input voltage figure 12. load transient c in =c out =1f, v en =v in =24v i out =from 1ma to 85ma t r =t f =5s figure 13. line transient figure 14. enable transient c out =1f; v in =v en =from 4.3 to 22v; i out =1ma; t r =t f =5s c in = c out =1f, v en =v in =0 to 4.3v, i out =1ma v in =v inh , i out =1ma, v out =3.3v 0 1 2 3 4 5 0 5 10 15 20 25 v in [v] iq [ a] v in =v inh , i out =1ma, v out =3.3v 0 1 2 3 4 5 0 5 10 15 20 25 v in [v] iq [ a]
package mechanical data st71 5xx - st715xx25 - st715xx33 12/18 8 package mechanical data in order to meet environmental requirements, st offers these devices in ecopack ? packages. these packages have a lead-free second level interconnect. the category of second level interconnect is marked on the package and on the inner box label, in compliance with jedec standard jesd97. the maximum ratings related to soldering conditions are also marked on the inner box label. ecopack is an st trademark. ecopack specifications are available at: www.st.com.
st715xx - st715xx25 - st715 xx33 package mechanical data 13/18 dim. mm. mil s . min. typ. max. min. typ. max. a0. 9 0 1.45 3 5.4 57.1 a1 0.00 0.10 0.0 3 . 9 a2 0. 9 01. 3 0 3 5.4 51.2 b 0. 3 5 0.50 1 3 .7 1 9 .7 c0.0 9 0.20 3 .5 7. 8 d2. 8 0 3 .00 110.2 11 8 .1 e 1.50 1.75 5 9 .0 6 8 . 8 e0. 9 5 3 7.4 h 2.60 3 .00 102. 3 11 8 .1 l 0.10 0.60 3 . 9 2 3 .6 s ot2 3 -5l mechanical data 704 9 676d
package mechanical data st71 5xx - st715xx25 - st715xx33 14/18 dim. mm. mil s . min. typ. max. min. typ. max. a0. 8 00. 9 0 1.00 3 1.5 3 5.4 39 .4 a1 0.02 0.05 0. 8 2.0 a 3 0.20 7. 9 b 0.25 0. 3 00. 3 5 9 . 8 11. 8 1 3 . 8 d2. 8 5 3 .00 3 .15 112.2 11 8 .1 124 d2 1.60 3 1.75 3 1. 8 5 3 6 3 .1 6 9 7 3 e2. 8 5 3 .00 3 .15 112.2 11 8 .1 124 e2 1. 3 45 1.4 9 5 1.5 9 55 3 5 8 . 9 62. 8 e 0.65 25.6 l0. 3 0 0.40 0.50 11. 8 15.7 1 9 .7 dfn 8 ( 3 x 3 mm) mechanical data
st715xx - st715xx25 - st715 xx33 package mechanical data 15/18 dim. mm. inch. min. typ. max. min. typ. max. a1 8 0 7.0 8 6 c 12. 8 1 3 .0 1 3 .2 0.504 0.512 0.51 9 d 20.2 0.7 9 5 n60 2. 3 62 t 14.4 0.567 ao 3 .1 33 .2 33 . 33 0.12 3 0.127 0.1 3 1 bo 3 .07 3 .17 3 .27 0.120 0.124 0.12 8 ko 1.27 1. 3 7 1.47 0.050 0.054 0.0.5 8 po 3 . 9 4.0 4.1 0.15 3 0.157 0.161 p 3 . 9 4.0 4.1 0.15 3 0.157 0.161 tape & reel s ot2 3 -xl mechanical data
package mechanical data st71 5xx - st715xx25 - st715xx33 16/18 dim. mm. inch. min. typ. max. min. typ. max. a1 8 0 7.0 8 7 c 12. 8 1 3 .2 0.504 0.51 9 d 20.2 0.7 9 5 n60 2. 3 62 t 14.4 0.567 ao 3 . 3 0.1 3 0 bo 3 . 3 0.1 3 0 ko 1.1 0.04 3 po 4 0.157 p 8 0. 3 15 tape & reel qfnxx/dfnxx ( 3 x 3 ) mechanical data
st715xx - st715xx25 - st 715xx33 revision history 17/18 9 revision history table 8. document revision history date revision changes 08-feb-2008 1 initial release. 19-feb-2008 2 modified: features on page 1 . 22-sep-2008 3 modifi ed: dfn8 (3x3 mm) mechanical data on page 14 . 26-nov-2008 4 modified: section 5 on page 8 .
st715xx - st715xx25 - st715xx33 18/18 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by an authorized st representative, st products are not recommended, authorized or warranted for use in milita ry, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2008 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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