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november 2007 rev. 4 1/18 18 STLQ50XX 50 ma, 3 a supply current low drop linear regulator features 2.3 v to 12 v input voltage range 50 ma maximum output current 3 a quiescent current available in 1.8 v, 2.5 v, 3.3 v, 5.0 v and adjustable 200 mv dropout voltage at 25 ma output current internal thermal protection available in sot323-5l package, and sot23- 5l package (upon request) applications portable/battery powered equipments electronic sensors microcontroller power real time clock backup power description the stlq50 is a bicmos linear regulator specifically designed for operating in environment with very low power consumption constraints. due to the very low quiescent current (3 a) the device is suitable for those application that have very long stand-by time allowing extension of battery life. the p-mos pass element allows also a very good drop-out figure (200 mv at 25 ma i o and 350 mv at full load) without affecting the consumption characteristics. housed in the very small sot323-5l or sot23- 5l, it fulfils the space saving requirements in battery powered equipments. sot23-5l sot323-5l (available on request) table 1. device summary part number order codes output voltage packages sot323-5l (t&r) so t23-5l (t&r) (1) STLQ50XX18 stlq50c18r stlq50m18r fixed v o = 1.8v STLQ50XX25 stlq50c25r stlq50m25r fixed v o = 2.5v STLQ50XX33 stlq50c33r stlq50m33r fixed v o = 3.3v STLQ50XX50 stlq50c50r stlq50m50r fixed v o = 5.0v stlq50 stlq50c-r stlq50m-r adjustable 1. available upon request. www.st.com
STLQ50XX 2/18 contents 1 diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 7 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7.1 external components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7.2 power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7.3 protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 8 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 9 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
STLQ50XX diagram 3/18 1 diagram figure 1. block diagram v bandgap 1.22v vin vout gnd short circuit & thermal protection adj fixed adjustable
pin configuration STLQ50XX 4/18 2 pin configuration figure 2. pin connections (top view) n/c out adj gnd stlq50 in n/c out adj gnd stlq50 in table 2. pin description pin n symbol note 1 adj stlq50: output voltage adjust n/c STLQ50XX: not connected 2 gnd ground 3 n/c not connected 4 in input voltage 5 out output voltage
STLQ50XX maximum ratings 5/18 3 maximum ratings note: absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these conditions is not implied. table 3. absolute maximum ratings symbol parameter value unit v i dc input voltage -0.3 to +14 v v fb fb voltage -0.3 to +7 v esd human body model (all pins) 2 kv t j junction temperature -40 to 150 c t stg storage temperature range -55 to 150 c table 4. thermal data symbol parameter sot323-5l sot23-5l unit r thja thermal resistance junction-ambient 331.4 (1) 191 (1) c/w 1. this value is referred to a 4-layer pcb, jedec standard test board.
electrical characteristics STLQ50XX 6/18 4 electrical characteristics table 5. electrical characteristics (v i = v o(nom) +1 v or v i = 2.5 v if v o + 1.5 v; t a = -40 c to 125 c; i o = 1 ma; typical values are at t a = 25 c, c o = 1 f unless otherwise specified) symbol parameter test conditions min. typ. max. unit v i input voltage range i o =20ma 2.3 12 v i o =50ma 2.5 12 i q quiescent current (measured on ground pin, fixed version) v i =5v 3.5 5.0 a v i =12v 4.1 6.0 v o output voltage range (stlq50adj) 1.222 11 v accuracy as percentage of nominal voltage at t j =25c -2 +2 % v drop-max max dropout voltage (1) 1. v i =2.5v when v o(nom) 2.1v i o =50ma; 0.4 0.7 v v o load regulation 1ma < i o <50ma 0.15 %/ma v o line regulation v o =1.5v: v o +1v < v i <12v; v o =1.5v: 2.5v < v i <12v; 0.3 %/v svr supply voltage rejection v ripple = 0.1v, i o = 20ma f=120hz 30 db en output noise voltage b w from 200hz to 100khz; i o =10ma 560 v rms th thermal protection 160 c i omax maximum output current (2) 2. the maximum power dissipation must not be ex ceeded, see application in formation for details. v o =0v 500 ma
STLQ50XX typical application 7/18 5 typical application figure 3. fixed versions: stlq50 18- stlq5025- stlq5033- stlq5050 figure 4. adjustable version stlq50adj
typical characteristics STLQ50XX 8/18 6 typical characteristics figure 5. v o vs t j figure 6. v o vs v i figure 7. i q vs t j figure 8. v drop vs i o figure 9. v drop vs t j figure 10. stability v i =2.8v, i o =20ma 1.72 1.74 1.76 1.78 1.8 1.82 1.84 -50 -25 0 25 50 75 100 125 v o [v] temp [c] v i =2.8v, i o =20ma 1.72 1.74 1.76 1.78 1.8 1.82 1.84 -50 -25 0 25 50 75 100 125 v o [v] v i =2.8v, i o =20ma 1.72 1.74 1.76 1.78 1.8 1.82 1.84 -50 -25 0 25 50 75 100 125 v o [v] temp [c] i o =50ma, v o =1.8v 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 0 12345 v o [v] v i [v] i o =50ma, v o =1.8v 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 0 12345 v o [v] v i [v] v i =5v, i o =1ma, v o =1.8v 2.8 2.9 3 3.1 3.2 3.3 3.4 3.5 -50 -25 0 25 50 75 100 125 iq [ a] temp [c] v i =5v, i o =1ma, v o =1.8v 2.8 2.9 3 3.1 3.2 3.3 3.4 3.5 -50 -25 0 25 50 75 100 125 iq [ a] v i =5v, i o =1ma, v o =1.8v 2.8 2.9 3 3.1 3.2 3.3 3.4 3.5 -50 -25 0 25 50 75 100 125 iq [ a] temp [c] t a =25c 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0 102030 40 50 v drop [v] i o [ma] t a =25c 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0 102030 40 50 v drop [v] i o [ma] v o =2.45v, i o =50ma 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 -50 -25 0 25 50 75 100 125 v drop [v] temp [c] v o =2.45v, i o =50ma 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 -50 -25 0 25 50 75 100 125 v drop [v] temp [c] t a =25c 0 1 2 3 4 5 6 7 8 9 10 11 12 0 12345 esr[ ] c o [ f] t a =25c 0 1 2 3 4 5 6 7 8 9 10 11 12 0 12345 esr[ ] c o [ f]
STLQ50XX typical characteristics 9/18 figure 11. s.v.r. vs freq. figure 12. s.v.r. vs i o figure 13. line transient response figure 14. load transient response i o =50ma; c o =10f; v i =2.8v, v i rise/fall=5ms c o =1f; v o =1.8v; v i =2.8v, curr. rise/fall=1s figure 15. short circuit current figure 16. thermal protection v o =1.8v, i o =20ma 2 7 12 17 22 27 32 37 100 1000 10000 100000 svr [db] frequency [hz] v o =1.8v, i o =20ma 2 7 12 17 22 27 32 37 100 1000 10000 100000 svr [db] frequency [hz] v o =1.8v, f=120hz 20 22 24 26 28 30 32 34 36 38 40 0 1020304050 svr [db] i o [ma] v o =1.8v, f=120hz 20 22 24 26 28 30 32 34 36 38 40 0 1020304050 svr [db] i o [ma] v o =0, t a =25c 0 0.1 0.2 0.3 0.4 0.5 0.6 2 4 6 8 10 12 14 i o [a] v i [v] v o =0, t a =25c 0 0.1 0.2 0.3 0.4 0.5 0.6 2 4 6 8 10 12 14 i o [a] v o =0, t a =25c 0 0.1 0.2 0.3 0.4 0.5 0.6 2 4 6 8 10 12 14 i o [a] v i [v] v i =2.8v 0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 155 157 159 161 163 165 167 169 171 173 175 t j [c] v o [v] v i =2.8v 0 0.25 0.5 0.75 1 1.25 1.5 1.75 2 155 157 159 161 163 165 167 169 171 173 175 t j [c] v o [v]
application information STLQ50XX 10/18 7 application information the stlq50 is a bicmos linear regulator specifically designed for operating in environment with very low power consumption constraints. the very low quiescent current of 3 a is obtained with use of cmos technology that makes the device suitable for those application that have very long stand-by time. the very low power consumption allows extending the battery life and the tiny packages (sot323-5l or sot23-5l) fulfil the space saving requirements of battery powered equipments. moreover the stlq50 provides wide input voltage operation from 2.5 v up to 12 v. the p-mos pass element allows also a very good drop-out figure: 0.7 v at full load and at 125 c without affecting the consumption characteristics. 7.1 external components the typical application schematic of stlq50 is shown in figure 1 - figure 2 , a 1 f input and output capacitors placed close to the device are needed in order to provide proper operation. the device is stable with electrolyt ic and ceramic output capacitors having values higher than 1 f (see figure typica l characteristics for stability details). in the adjustable version (stlq50) the output voltage is programmed using an external resistor divider as shown in figure 2 . the output voltage can be adjusted from 1.22 to 11 v and it can be calculated using the following formula: v o = v fb x (1+r 1 /r 2 ) where v fb =1.222 v is the internal reference voltage; the sum between r 1 and r 2 resistors should be chosen in order to guarantee 1 a of divider current at least. lower value resist ors will improve the noise performances but the quiescent current will in crease. higher value resistors shou ld be avoided because the adj leakage current will influence the voltage set by the resistor divi der making the above formula no more valid. the suggested design procedure is to choose r 2 = 1 m and then calculate r 1 using the following formula: r 1 = (v o /v fb -1) x r 2 7.2 power dissipation in order to ensure proper operation, the stlq50 junction temperature should never exceed 125 c, this limits the maximum power dissipation the regulator can sustain in any application. the maximum power dissipation can be calculated as: p dmax = (t jmax - t a )/r thja where t jmax = 125 c; t a is the ambient temperature; r thja is the junction to ambient thermal resistance of the package (see ta bl e 4 thermal data). the power dissipation can be calculated simply as: p d = (v i - v o ) x i o in every application condition, p d must be lower than p dmax .
STLQ50XX application information 11/18 7.3 protection the p-mos pass element has an internal diode with anode connected to v o and cathode to v i . in case v o > v i the current will flow from output to t he input without any limitation. in this case proper limiting network is recommended. the current limitation is automatically provided by the characteristics of the pmos pass element (see typical characteristics), so the short circuit current is dependent on the input voltage. when considering the short circuit current take care, in any case, to not exceed the maximum power dissipation sustainable by the device. the stlq50 features an internal thermal protection that linearly reduces the output current when the internal temperature increases, consequently, at a given load, also the output voltage decreases. the action of the thermal protection starts at 125 c when the output voltage slightly decreases, while close to 163 c the output voltage drops to 0 v. since this is a linear control, sudden over current conditions can quickly rise the chip temperature without time for the thermal protection to act, so it cannot be used as a limitation for the output current.
package mechanical data STLQ50XX 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.
STLQ50XX package mechanical data 13/18 dim. mm. mil s . min. typ. max. min. typ. max. a0. 8 0 1.10 3 1.5 4 3 . 3 a1 0.00 0.10 0.0 3 . 9 a2 0. 8 0 1.00 3 1.5 39 .4 b 0.15 0. 3 05. 9 11. 8 c 0.10 0.1 83 . 9 7.1 d1. 8 0 2.20 70. 98 6.6 e1. 8 0 2.40 70. 99 4.5 e1 1.15 1. 3 5 45. 3 5 3 .1 e 0.65 25.6 e1 1. 3 51.2 l 0.10 0. 3 0 3 . 9 11. 8 s ot 3 2 3 -5l mechanical data
package mechanical data STLQ50XX 14/18 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
STLQ50XX package mechanical data 15/18 dim. mm. inch. min. typ. max. min. typ. max. a 175 1 8 01 8 56. 889 7.0 8 6 7.2 83 c 12. 8 1 3 1 3 .2 0.504 0.512 0.51 9 d 20.2 0.7 9 5 n5 9 .5 60 60.5 2. 3 62 t 14.4 0.567 ao 2.25 0.0 88 bo 2.7 0.106 ko 1.2 0.047 po 3 . 9 4 4.1 0.15 3 0.157 0.161 p 3 . 8 4 4.2 0.14 9 0.157 0.165 tape & reel s ot 3 2 3 -xl mechanical data
package mechanical data STLQ50XX 16/18 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
STLQ50XX revision history 17/18 9 revision history table 6. document revision history date revision changes 07-feb-2007 1 initial release. 13-feb-2007 2 typo in cover page 350ma ==> 350mv. 06-jul-2007 3 added part number. 14-nov-2007 4 added ta b l e 1 .
STLQ50XX 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. ? 2007 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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