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november 2009 doc id 4275 rev 6 1/19 1 l4949e multifunction very low drop voltage regulator features operating dc supply voltage range 5 v - 28 v transient supply voltage up to 40v extremely low quiescent current in standby mode high precision standby output voltage 5v1% output current capa bility up to 100ma very low dropout voltage less than 0.5v reset circuit sensing the output voltage programmable reset pulse delay with external capacitor voltage sense comparator thermal shutdown and short circuit protections description the l4949e is a monolithic integrated 5v voltage regulator with a very low dropout output and additional functions as power-on reset and input voltage sense. it is designed for supplying the microcomputer controlled systems especially in automotive applications. table 1. device summary package order codes tube tape and reel so-8 l4949ed L4949ED013TR so-20w l4949ep l4949ep013tr so-8 so-20w (12+4+4) www.st.com obsolete product(s) - obsolete product(s)
contents l4949e 2/19 doc id 4275 rev 6 contents 1 block diagram and pin descripti on . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.3 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.1 supply voltage transient . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.2 functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.3 voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.4 preregulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.5 reset circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.6 sense comparator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4 package and packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.1 ecopack ? packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.2 so-8 tp package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.3 so-20 tp package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 5 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 obsolete product(s) - obsolete product(s)
l4949e list of tables doc id 4275 rev 6 3/19 list of tables table 1. device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 table 2. pin definitions and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 table 3. absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 table 4. thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 table 5. electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 table 6. reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 table 7. sense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 table 8. preregulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 table 9. so-8 tp mechanical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 table 10. so-20 tp mechanical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 table 11. document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 obsolete product(s) - obsolete product(s)
list of figures l4949e 4/19 doc id 4275 rev 6 list of figures figure 1. block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 figure 2. configuration diagram (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 figure 3. application circuit (1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 figure 4. foldback ch aracteristic of v o . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 figure 5. output voltage vs input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 figure 6. quiescent current vs supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 figure 7. block circuit of reset circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 figure 8. waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 figure 9. so-8 tp package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 figure 10. so20 tp package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 obsolete product(s) - obsolete product(s)
l4949e block diagram and pin description doc id 4275 rev 6 5/19 1 block diagram and pin description figure 1. block diagram note: the block diagram illustrates on ly a major internal device functi onality and it is not intended to mimic any details of hardware design figure 2. configurati on diagram (top view) so-8 so-20 obsolete product(s) - obsolete product(s)
block diagram and pin description l4949e 6/19 doc id 4275 rev 6 table 2. pin definitions and functions pin n symbol function so-8 so-20 119 v s input supply voltage. block to gnd via an external capacitor (see figure 3 ). 220 s i sense input pin to supervise input voltage. connect via an external voltage divider connected to v s and to gnd. 31 v z preregulator output voltage. for details, see section 3.4: preregulator . 42 c t reset pulse delay adjustment. connecting this pin via a capacitor to gnd 5 4, 5, 6, 7, 14, 15, 16, 17 gnd ground reference 610 res reset output. it is pulled down when the output voltage goes below v rt . 711 s o sense output. this open collector pin must be connected to v out via an external resistor. it is pulled down whenever the s i voltage becomes lower than an internal voltage. 812 v out output voltage. block to gnd via an external capacitor (see figure 3 ) - 3, 8, 9, 13, 18 nc not connected pins obsolete product(s) - obsolete product(s)
l4949e electrical specifications doc id 4275 rev 6 7/19 2 electrical specifications 2.1 absolute maximum ratings 2.2 thermal data table 3. absolute maximum ratings (1) 1. the circuit is esd protected according to mil-std-883c. symbol parameter value unit v sdc dc operating supply voltage 28 v v str transient supply voltage (t < 1s) 40 v i o output current internally limited v o output voltage 20 v v res , v so output voltage 20 v i res , i so output current 5 ma v ct reset delay voltage 7 v v sidc sense input voltage 28 v v z preregulator output voltage 7 v i z preregulator output current 5 ma t j junction temperature -40 to +150 c t stg storage temperature range -55 to +150 c table 4. thermal data symbol descriptio n so-8 so20l unit r th j-amb thermal resistance junction -ambient (max) 200 50 c/w r th j-pins thermal resistance junction-pins (max) 15 c/w tjsd thermal shutdown junction temperature 165 c obsolete product(s) - obsolete product(s)
electrical specifications l4949e 8/19 doc id 4275 rev 6 2.3 electrical characteristics v s = 14 v; -40 c < t j < 125 c unless otherwise specified table 5. electrical characteristics symbol parameter test condit ion min. typ. max. unit v o output voltage t j = 25 c; i o = 1 ma 4.95 5 5.05 v v o output voltage 6 v < v in < 28 v, 1 ma < i o < 50 ma 4.90 5 5.10 v v o output voltage v in = 40 v; t < 1s; 5ma < i o < 100 ma 4.75 5.25 v v dp dropout voltage i o = 10 ma i o = 50 ma i o = 100 ma 0.1 0.2 0.3 0.25 0.4 0.5 v v v v io input to output voltage difference in undervoltage condition v in = 4 v, i o = 35 ma 0.4 v i outh (1) max output leakage v in = 25 v, v o = 5.5 v 20 50 80 a v ol line regulation 6 v < v in < 28 v; i o = 1 ma 20 mv v olo load regulation 1 ma < i o < 100 ma 30 mv i lim current limit v o = 4.5 v v o = 4.5 v; t j = 25 c v o = 0 v (2) 105 120 200 100 400 400 ma ma ma i qse quiescent current i o = 0.3 ma; t j < 100 c 200 300 a i q quiescent current i o = 100 ma 5 ma 1. with this test we guarantee that with no output current the output voltage will not exceed 5.5v 2. foldback characteristic table 6. reset symbol parameter test condit ion min. typ. max. unit v rt reset threshold voltage vo - 0.5v v v rth reset threshold hysteresis 50 100 200 mv t rd reset pulse delay c t = 100 nf; t r 100 s 55 100 180 ms v rl reset output low voltage r res = 10 k to v o v s 1.5v 0.4 v i rh reset output high leakage current v res = 5 v 1 a v ctth delay comparator threshold 2 v v ctth, hy delay comparator threshold hysteresis 100 mv obsolete product(s) - obsolete product(s)
l4949e electrical specifications doc id 4275 rev 6 9/19 table 7. sense symbol parameter test condit ion min. typ. max. unit v st sense low threshold 1.16 1.23 1.35 v v sth sense threshold hysteresis 20 100 200 mv v sl sense output low voltage v si 1.16 v; v s 3v r so = 10 k to v o 0.4 v i sh sense output leakage v so = 5 v; v si 1.5 v 1 a i si sense input current v si = 0 -20 -8 -3 a table 8. preregulator symbol parameter test condit ion min. typ. max. unit v z preregulator output voltage i z = 10 a 4.5 5 6 v i z preregulator output current 10 a obsolete product(s) - obsolete product(s)
application information l4949e 10/19 doc id 4275 rev 6 3 application information figure 3. application circuit (1) 1. for stability: c s 1f, c o 4.7f, esr < 10 at 10khz recommended for application: c s = c o = 10 f to 100 f 3.1 supply voltage transient high supply voltage transients can cause a reset output signal disturbance. for supply voltages greater than 8v the circuit shows a high immunity of the reset output against supply transients of more than 100v/s. for supply voltages less than 8v supply transients of more than 0.4v/s can cause a reset signal disturbance. to improve the transient behaviour for supply voltages less than 8v a capacitor at pin v z can be used. this capacitor (c3 1 f) reduces also the output noise. 3.2 functional description the l4949e is a monolithic integrated voltage regulator, based on the stm modular voltage regulator approach. several outs tanding features and auxiliary functions are implemented to meet the requirements of supplying microprocessor systems in automotive applications. nevertheless, it is suitable also in other applications where the present functions are obsolete product(s) - obsolete product(s)
l4949e application information doc id 4275 rev 6 11/19 required. the modular approach of this device allows to get easily also other features and functions when required. 3.3 voltage regulator the voltage regulator uses an isolated collect or vertical pnp transistor as a regulating element. figure 4. foldback characteristic of v o with this structure very low dropout voltage at currents up to 100ma is obtained. the dropout operation of the standby regulator is maintained down to 3v input supply voltage. the output voltage is regulated up to the transient input supply voltage of 40v. with this feature no functional interruption due to overvoltage pulses is generated. the typical curve showing the standby output voltage as a function of the input supply voltage is shown in figure 5 . the current consumption of the device (quiescent current) is less than 300 a. to reduce the quiescent current peak in the undervoltage region and to improve the transient response in this region, the dropout voltage is controlled, the quiescent current as a function of the supply input voltage is shown in figure 6 . obsolete product(s) - obsolete product(s)
application information l4949e 12/19 doc id 4275 rev 6 figure 5. output voltage vs input voltage figure 6. quiescent current vs supply voltage 3.4 preregulator to improve the transient immunity a preregulator stabilizes the internal supply voltage to 5 v. this internal voltage is present at pin 3 (v z ). this voltage should not be used as an output because the output capa bility is very small ( 10 a). this output may be used as an option when a better transient behaviour for supply voltages less than 8 v is required (see also application note). in this case a capacitor (100 nf - 1 f) must be connected between pin v z and gnd. if this feature is not used pin v z must be left open. obsolete product(s) - obsolete product(s)
l4949e application information doc id 4275 rev 6 13/19 3.5 reset circuit the block circuit diagram of the reset circuit is shown in figure 7 . the reset circuit supervises the output voltage. the reset threshold of 4.5 v is defined with the internal reference voltage and standby output drivider. the reset pulse delay time t rd , is defined with the charge time of an external capacitor c t : the reaction time of the reset circuit originates from the discharge time limitation of the reset capacitor ct and is proportional to the value of ct. the reaction time of the reset circuit increases the noise immunity. standby output voltage drops below the reset threshold only a bit longer than the reaction time results in a shorter reset delay time. the nominal reset delay time is generated for standby output voltage drops longer than approximately 50ms. the typical reset output waveforms are shown in figure 8 . 3.6 sense comparator the sense comparator compares an input signal with an internal voltage reference of typical 1.23v. the use of an external voltage divider makes this comparator very flexible in the application. it can be used to supervise the input voltage either before or after the protection diode and to give additional informations to the microprocessor like low voltage warnings. figure 7. block circuit of reset circuit t rd c t 2v ? 2 a -------------------- - = obsolete product(s) - obsolete product(s)
application information l4949e 14/19 doc id 4275 rev 6 figure 8. waveforms obsolete product(s) - obsolete product(s)
l4949e package and packing information doc id 4275 rev 6 15/19 4 package and packing information 4.1 ecopack ? packages in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack ? specifications, grade definitions and product status are available at: www.st.com . ecopack ? is an st trademark. 4.2 so-8 tp package information table 9. so-8 tp mechanical data dim. mm min. typ. max. a 1.75 a1 0.1 0.25 a2 1.65 a3 0.65 0.85 b 0.35 0.48 b1 0.19 0.25 c 0.25 0.5 c1 45 (typ.) d (1) 1. d and f do not include mold flash or protrusions. mold flash or protrusions shall not exceed 0.15mm (.006inch). 4.8 5.0 e 5.8 6.2 e 1.27 e3 3.81 f (1) 3.8 4.0 l 0.4 1.27 m 0.6 s 8 (max.) obsolete product(s) - obsolete product(s)
package and packing information l4949e 16/19 doc id 4275 rev 6 figure 9. so-8 tp package dimensions 4.3 so-20 tp package information table 10. so-20 tp mechanical data dim. mm min. typ. max. a 2.35 2.65 a1 0.1 0.3 b 0.33 0.51 c 0.23 0.32 d 12.6 13 e 7.4 7.6 e 1.27 h 10 10.65 obsolete product(s) - obsolete product(s)
l4949e package and packing information doc id 4275 rev 6 17/19 figure 10. so20 tp package dimensions h 0.25 0.75 l 0.4 1.27 k 0 (min.)8 (max.) table 10. so-20 tp mechanical data (continued) dim. mm min. typ. max. obsolete product(s) - obsolete product(s)
revision history l4949e 18/19 doc id 4275 rev 6 5 revision history table 11. document revision history date revision description of changes 01-jun-2000 1 initial release. 25-nov-2009 6 reformatted entire document. removed minidip package. added table 2: pin definitions and functions . updated table 3: absolute maximum ratings updated figure 1: block diagram and figure 3: application circuit (1) obsolete product(s) - obsolete product(s)
l4949e doc id 4275 rev 6 19/19 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 military , 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. ? 2009 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 - philippines - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com obsolete product(s) - obsolete product(s)

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