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september 2007 rev. 6 1/16 16 l4987cxx very low drop voltage regulators with inhibit and dr opout control flag features very low dropout voltage (0.25 v typ.) dropout control flag very low quiescent current (typ. 90 ma in off mode, 500 ma in on mode) output current up to 200 ma logic-controlled electronic shutdown output voltages of 3.3 v, 5 v internal current and thermal limit only 2.2 f for stability available in 2% selection at 25c supply voltage rejection: 70 db (typ.) description the l4987 is a very low drop regulator available in ppak. the very low drop-voltage (0.5 v max at 200 ma) and the very low quiescent current make it particularly suitable for low noise, low power applications, and in battery powered systems. the input dump protection up to 40 v makes it ideal for automotive applications. a shutdown logic control function is available (pin 2, ttl compatible). this means that when the device is used as a local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption. the regulator employs an output pin (open collector) providing a logic signal when the pass transistor is in saturation at low input voltage, this signal can be used to prevent the pop-up phenomenon in the car radio. in battery powered systems (the cellular phone, notebook) it is possible to use the flag to monitor the battery charge status through the dropout of the regulator. ppak table 1. device summary part number order code output voltage l4987cxx33 l4987cpt33tr 3.3 v L4987CXX50 l4987cpt50tr 5.0 v www.st.com obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
l4987cxx 2/16 contents 1 schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 application hint of l4987cpt33 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6.1 how to use the control flag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7 test circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 8 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 9 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
l4987cxx schematic diagram 3/16 1 schematic diagram figure 1. schematic diagram obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
pin configuration l4987cxx 4/16 2 pin configuration figure 2. pin connections (top view) obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
l4987cxx maximum ratings 5/16 3 maximum ratings note: absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these condition is not implied table 2. absolute maximum ratings symbol parameter value unit v i dc input voltage 40 v i o output current internally limited p tot power dissipation internally limited t stg storage temperature range -40 to 150 c t op operating junction temperature range -40 to 125 c table 3. thermal data symbol parameter ppak unit r thjc thermal resistance junction-case 8 c/w r thja thermal resistance j unction-ambient 100 c/w obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
electrical characteristics l4987cxx 6/16 4 electrical characteristics table 4. electrical characteristics of l4987cxx33 (refer to the test circuits, v i = 6.3 v, i o = 5 ma, t j = 25c, c i = 0.1 f, c o = 2.2 f unless otherwise specified) symbol parameter test conditions min. typ. max. unit v o output voltage i o = 200 ma, v i = 6.3 v 3.234 3.3 3.366 v i o = 200 ma, v i = 6.3 v, t j =-40 to 125c 2.76 3.432 v i operating input voltage i o = 200 ma 4 18 v i out output current limit 250 a v o line regulation v i = 4.6 to 18 v, i o = 0.5 ma 2.4 14 mv v o load regulation v i = 4.4 v, i o = 0.5 to 200 ma 3 20 mv i d quiescent current on mode v i = 4.6 to 18 v, i o = 0 ma 0.7 1 ma v i = 4.6 to 18 v, i o = 200 ma 1.5 6 off mode v i = 12 v 90 180 a svr supply voltage rejection i o = 5 ma v i = 5.6 1 v f = 120 hz 80 db f = 1 khz 75 f = 10 khz 60 v d dropout voltage i o = 200 ma 0.25 0.5 v i o = 200 ma, t j =-40 to 125c 0.7 v il control input logic low t j = -40 to 125c 0.8 v v ih control input logic high t j = -40 to 125c 2 v i i control input current 10 a c o output bypass capacitance esr = 0.5 to 10 , i o = 0 to 200 ma t j = -40 to 125c 210 f v fl control flag output low v i - v o < v cesat power, i fl = 6ma i o = 200ma 0.5 v i fh control flag output high leakage current v i > 4 v, v oh = 15 v 10 a obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
l4987cxx electrical characteristics 7/16 table 5. electrical characteristics of L4987CXX50 (refer to the test circuits, v i = 8 v, i o = 5 ma, t j = 25c, c i = 0.1 f, c o = 2.2 f unless otherwise specified) symbol parameter test conditions min. typ. max. unit v o output voltage i o = 200 ma, v i = 8 v 4.9 5 5.1 v i o = 200 ma, v i = 8 v, t j = - 40 to 125c 4.8 5.2 v i operating input voltage i o = 200 ma 5.7 18 v i out output current limit 250 a v o line regulation v i = 6.3 to 18 v, i o = 0.5 ma 3 20 mv v o load regulation v i = 6.3 v, i o = 0.5 to 200 ma 3 20 mv i d quiescent current on mode v i = 6.3 to 18 v, i o = 0 ma 0.7 1 ma v i = 6.3 to 18 v, i o = 200 ma 1.5 6 off mode v i = 12 v 90 180 a svr supply voltage rejection i o = 5 ma v i = 7.3 1 v f = 120 hz 76 db f = 1 khz 71 f = 10 khz 58 v d dropout voltage i o = 200 ma 0.3 0.5 v i o = 200 ma, t j = -40 to 125c 0.7 v il control input logic low t j = -40 to 125c 0.8 v v ih control input logic high t j = -40 to 125c 2 v i i control input current 10 a c o output bypass capacitance esr = 0.5 to 10 , i o = 0 to 200 ma t j = -40 to 125c 210 f v fl control flag output low v i - v o < v cesat power, i fl = 6 ma i o = 200 ma 0.5 v i fh control flag output high leakage current v i > 5.85 v, v oh = 15 v 10 a obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
typical characteristics l4987cxx 8/16 5 typical characteristics (unless otherwise specified t j = 25c, c i = c o = 0.1 f) figure 3. output and flag voltage vs input voltage figure 4. output voltage vs input voltage figure 5. output and flag voltage vs input voltage figure 6. output voltage vs input voltage figure 7. output and flag voltage vs inp. volt. figure 8. output voltage vs input voltage obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
l4987cxx application hint of l4987cpt33 9/16 6 application hint of l4987cpt33 6.1 how to use the control flag the flag produces a logic "low" whenever the output drops out of regulation. an "out of regulation condition can result from: 1) low input voltage (v in v out + v drop ) 2) current limiting 3) thermal limiting figure 3. to figure 4. show the typical behavior of the output voltage and the control flag versus the input voltage and the temperature. no hysteresis is implemented; so the response of v out and v flag are the same either when the v in ramps up or down. the control flag is an open collector which requires an external pull-up resistor. this may be connected to the regulator output ( figure 11. ) or some other supply voltage ( figure 12. ). using the regulator output prevents an invalid "hi gh" on the flag which occurs if it is pulled up to an external voltage while the regulator input voltage is reduced below about 2 v ( figure 13. ). concerning the pull-up resistor its value must be properly chosen as suggested below. when "low" as it is possible to see in figure 7. the control flag voltage is: v flag(low) = v ce = 0.5 = v supply - r pull x i fl v supply is chosen by design and, thus is known, while i fl must be at maximum 10 ma. then 0.5 v v supply - r pull x 10 ma the minimum value of r pull , is, so, determined by the following equation: r pull(min) v supply - 0.5/10 ma regarding the maximum value of r pull note that its value depends of the type of logic used (cmos, ttl etc.), the transistor leakage current and the presence or not of a load on v flag . the following example shows how to determine the r pull max in the case of cmos logic, no load and 10 a (for l4987 it is the maximum value of i fh ) of control flag leakage current. because of cmos logic: v flag(high) 2/3 v supply but: v flag(high) = v supply - r pull x i fh 2/3 v supply so, the maximum value is determined by the following equation: r pull(max) (1/3 v supply )/10 ma obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
application hint of l4987cpt33 l4987cxx 10/16 figure 9. output and flag voltage vs input figure 10. flag voltage vs input obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
l4987cxx test circuits 11/16 7 test circuits figure 11. test circuit figure 12. single antenna receiver with master receiver port figure 13. equivalent output circuit figure 14. output and flag voltage vs input obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
package mechanical data l4987cxx 12/16 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. obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
l4987cxx package mechanical data 13/16 dim. mm. inch. min. typ. max. min. typ. max. a 2.2 2.4 0.0 8 6 0.0 9 4 a1 0. 9 1.1 0.0 3 5 0.04 3 a2 0.0 3 0.2 3 0.001 0.00 9 b 0.4 0.6 0.015 0.02 3 b2 5.2 5.4 0.204 0.212 c 0.45 0.6 0.017 0.02 3 c2 0.4 8 0.6 0.01 9 0.02 3 d 6 6.2 0.2 3 6 0.244 d1 5.1 0.201 e 6.4 6.6 0.252 0.260 e1 4.7 0.1 8 5 e 1.27 0.050 g4. 9 5.25 0.1 93 0.206 g1 2. 38 2.7 0.0 93 0.106 h 9 . 3 5 10.1 0. 3 6 8 0. 39 7 l2 0. 8 1 0.0 3 1 0.0 39 l4 0.6 1 0.02 3 0.0 39 l5 1 0.0 39 l6 2. 8 0.110 ppak mechanical data 007 8 1 8 0-e obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
package mechanical data l4987cxx 14/16 dim. mm. inch. min. typ. max. min. typ. max. a 33 0 12. 99 2 c12. 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 t22.40. 88 2 ao 6. 8 06. 9 0 7.00 0.26 8 0.272 0.2.76 bo 10.40 10.50 10.60 0.40 9 0.41 3 0.417 ko 2.55 2.65 2.75 0.100 0.104 0.105 po 3 . 9 4.0 4.1 0.15 3 0.157 0.161 p7. 98 .0 8 .1 0. 3 11 0. 3 15 0. 3 1 9 tape & reel dpak-ppak mechanical data obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
l4987cxx revision history 15/16 9 revision history table 6. document revision history date revision changes 22-jun-2004 4 v o min and v o max values in table 5, pag. 4 have been corrected. 04-sep-2006 5 the i fh value on table 7 has been updated and new template. 26-sep-2007 6 add table 1. in cover page. obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)
l4987cxx 16/16 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 obsolete product(s) - obsolete product(s) obsolete product(s) - obsolete product(s)

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