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november 2008 rev 3 1/19 19 l4989 low power voltage regulator features operating dc supply voltage range 5.6v to 31v very low quiescent current with watchdog disabled precision output voltage (3%) low drop voltage (180mv typ ai i o =150ma) reset circuit sensing the output voltage down to 1v programmable reset delay with external capacitor watchdog disable input programmable watchdog timer with external capacitor thermal shutdown and short circuit protection wide temperature range (t j = -40c to 150c) so-8 so-20 table 1. device summary package order codes tube tape & reel so-8 l4989d l4989d013tr so-20 L4989MD L4989MD013tr www.st.com obsolete product(s) - obsolete product(s)
contents l4989 2/19 contents 1 block diagram and pin co nfiguration . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.3 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.1 voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.2 reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.3 watchdog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 4 package and packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.1 ecopack ? packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.2 so-8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4.3 so-20 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.4 so-8 packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.5 so-20 packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 5 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 obsolete product(s) - obsolete product(s)
l4989 list of tables 3/19 list of tables table 1. device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 table 2. pins description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 table 3. absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 table 4. thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 table 5. general . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 table 6. reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 table 7. watchdog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 table 8. watchdog enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 table 9. so-8 mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 table 10. so-20 mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 table 11. document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 obsolete product(s) - obsolete product(s)
list of figures l4989 4/19 list of figures figure 1. block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 figure 2. pins configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 figure 3. behavior of output current versus regulated voltage vo . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 figure 4. reset timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 figure 5. watchdog timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 figure 6. so-8 package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 figure 7. so-20 package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 figure 8. so-8 tube shipment (no suffix) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 figure 9. so-8 tape and reel shipment (suffix ?tr?) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 figure 10. so-20 tube shipment (no suffix) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 figure 11. so-20 tape and reel shipment (suffix ?tr?) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 obsolete product(s) - obsolete product(s)
l4989 block diagram and pin configuration 5/19 1 block diagram and pin configuration figure 1. block diagram obsolete product(s) - obsolete product(s)
block diagram and pin configuration l4989 6/19 figure 2. pins configuration table 2. pins description pin name so-8(d) s0-20(md) function wen 1 1 watchdog enable input if high watchdog functionality is active gnd 2 4 ground reference gnd 5, 6, 15, 16 ground. connected these pins to a heat spreader ground res 3 7 reset output. it is pulled down when output voltage goes below vo_th or frequency at wi is too low. vcr 4 10 reset timing adjust. a capacitor between vcr pin and gnd, sets the reset delay time (trd) vcw 5 11 watchdog timer adjust a capacitor between vcw pin and gnd, sets the time response of the watchdog monitor. wi 6 14 watchdog input. if the frequency at this input pin is too low, the reset output is activated. vo 7 17 voltage regulator output block to ground with a capacitor >100nf (needed for regulator stability) vs 8 20 supply voltage block to ground directly at ic pin with a capacitor n.c. 2, 3, 8, 9, 12, 13, 18, 19 not connected wen gnd res vcr 1 2 3 4 5 6 7 8 vs vo wi vcw wen n.c. n.c. gnd gnd gnd res n.c. n.c. vcr 10 9 8 7 6 5 4 3 2 1 20 n.c. n.c. vo gnd gnd wi n.c. n.c. vcw 11 12 13 14 15 16 17 18 19 vs so-8 so-20 obsolete product(s) - obsolete product(s)
l4989 electrical specifications 7/19 2 electrical specifications 2.1 absolute maximum ratings note: maximum ratings are absolute ratings; exceeding any one of these values may cause permanent damage to the integrated circuit. 2.2 thermal data table 3. absolute maximum ratings symbol parameter value unit v vsdc dc supply voltage -0.3 to 40 v i vsdc input current internally limited v vo dc output voltage -0.3 to 6 v i vo dc output current internally limited v wi watchdog input voltage -0.3 to v vo + 0.3 v v od open drain output voltage -0.3 to v vo + 0.3 v i od open drain output current internally limited v cr reset delay voltage -0.3 to v vo + 0.3 v v cw watchdog delay voltage -0.3 to v vo + 0.3 v v wen watchdog enable input voltage -0.3 to 40 v t j junction temperature -40 to 150 ?c v esd esd voltage level (hbm-mil std 883c) 2 kv table 4. thermal data symbol parameter s0-8 s0-12+4+4 unit r th-jamb thermal resistance junction to ambient 130 to 180 50 (1) 1. with 6 sq. cm on board heat sink. c/w obsolete product(s) - obsolete product(s)
electrical specifications l4989 8/19 2.3 electrical characteristics v s =5.6v to 31v, t j = -40c to +150c unless otherwise specified. table 5. general pin symbol parameter test condition min. typ. max. unit vo v o_ref output voltage vs = 5.6 to 31v io = 1 to 150 ma 4.85 5.0 5.15 v vo i short_13 short circuit current vs = 13.5v (1) 1. see figure 3 . 160 210 250 ma vo i lim output current limitation vs = 13.5v (1) 170 250 290 ma vs, vo v line line regulation voltage vs = 5.6 to 31v io = 1 to 150ma 25 mv vo v load load regulation voltage io = 1 to 150ma 25 mv vs, vo v dp drop voltage io = 150ma 180 400 mv vs, vo svr ripple rejection fr = 100 hz 55 db vs, vo i qs_1 current consumption with watchdog not active i qs_1 = i vs -i o vs=13.5v, io<1ma, wen = low 69 115 a vs, vo i qs_10 current consumption with watchdog not active i qs_10 = i vs -i o vs=13.5v, io= 10ma, wen = low 127 300 a vs, vo i qs_50 current consumption with watchdog not active i qs_50 = i vs -i o vs=13.5v, io= 50ma, wen = low 498 900 a vs, vo i qs_150 current consumption with watchdog not active i qs_150 = i vs -i o vs=13.5v, io= 150ma, wen = low 1.40 2 ma vs, vo i qn_1 current consumption with watchdog active i qn_1 = i vs -i o vs=13.5v, io<1ma, wen = high 110 170 a vs, vo i qn_10 current consumption with watchdog active i qn_10 = i vs -i o vs=13.5v, io= 10ma, wen = high 168 350 a vs, vo i qn_50 current consumption with watchdog active i qn_50 = i vs -i o vs=13.5v, io= 50ma, wen = high 538 1000 a vs, vo i qn_150 current consumption with watchdog active i qn_150 = i vs -i o vs=13.5v, io= 150ma, wen = high 1.45 2 ma tw thermal protection temperature 150 190 c tw _ hy thermal protection temperature hysteresis 10 c obsolete product(s) - obsolete product(s)
l4989 electrical specifications 9/19 table 6. reset pin symbol parameter test condition min. typ. max. unit res vres_l reset output low voltage r ext = 5k ? to vo, vo > 1v 0.4 v res i res_lkg reset output high leakage current v res = 5v 1 a res r res pull up internal resistance versus vo 10 20 40 k ? res vo_th reset threshold voltage vs = 5.6 to 31v, io = 1 to 150ma 6% 8% 10% below v o_ref vcr vrlth reset timing low threshold vs = 13.5v 10% 13% 16% v o_ref vcr vrhth reset timing high threshold vs =13.5v 44% 47% 50% v o_ref vcr icr charge current vs = 13.5v 8 15 30 a vcr idr discharge current vs = 13.5v 8 15 30 a res trr_2 reset reaction time (1) 1. when vo becomes lower than 4v, t he reset reaction time decreases dow n to 2s assuring a faster reset condition in this particular case. vo = v o_ th -100mv 100 250 700 s res trd reset delay time vs = 13.5v, ctr = 1nf 65 115 165 ms table 7. watchdog pin symbol parameter test condition min. typ. max. unit wi vih input high voltage vs = 13.5v 3.5 v wi vil input low voltage vs = 13.5v 1.5 v wi vih input hysteresis vs = 13.5v 500 mv wi rwi pull down resistor vs = 13.5v 30 100 250 k ? vcw vwhth high threshold vs = 13.5v 44% 47% 50% v o_ref vcw vwlth low threshold vs = 13.5v 10% 13% 16% v o_ref vcw icwc charge current vs = 13.5v, vcw = 0.1v 51020a vcw icwd discharge current vs = 13.5v, vcw = 2.5v 1.25 2.5 5 a vcw twop watchdog period vs = 13.5v, ctw = 47nf 20 40 80 ms res twol watchdog output low time vs = 13.5v, ctw = 47nf 4816ms obsolete product(s) - obsolete product(s)
electrical specifications l4989 10/19 table 8. watchdog enable pin symbol parameter test condition min. typ. max. unit wen v wen_l enable input low voltage 1 v wen v wen_h enable input high voltage 3 v wen v wen_hy enable input hysteresis 600 920 1300 mv wen i_leak pull down current vs = 13.5v 1 2.5 5 a obsolete product(s) - obsolete product(s)
l4989 application information 11/19 3 application information 3.1 voltage regulator the voltage regulator uses a p-channel mos tran sistor as a regulating element. with this structure a very low dropout voltage at current up to 150ma is obtained. the output voltage is regulated up to transient input supply voltage of 40v. no functional interruption due to over-voltage pulses is generated.the voltage regulator is always active and not depending on the state of wen input pin. a short circuit protection to gnd is provided. figure 3. behavior of output current versus regulated voltage vo 3.2 reset the reset circuit supervises the output voltage vo. the vo_th reset threshold is defined with the in-ternal reference voltage and a resistor output divider. if the output voltage becomes lower than vo_th then res goes low with a reaction time trr. the reset low signal is guaranteed for an output voltage vo greater than 1v. when the output voltage becomes higher than vo_th then res goes high with a delay trd. this delay is obtained by an internal oscillator. the oscillator period is given by: tosc = [(vrhth-vrlth) x ctr] / icr + [(vrhth-vrlth) x ctr] / idr where: icr: is an internally generated charge current idr: is an internally generated discharge current vrhth, vrlth: are two voltages defined with the output voltage and a resistor output divider ctr: is an external capacitance. trd is given by: trd = 512 x tosc the reset is always active and not depending on the state of wen input pin. vo vo_ref iout ishort ilim obsolete product(s) - obsolete product(s)
application information l4989 12/19 figure 4. reset timing diagram 3.3 watchdog a connected microcontroller is monitored by th e watchdog input wi. if pulses are missing, the reset output pin is set to low. the pulse sequence time can be set within a wide range with the external capacitor, ctw. the watchdog circuit discharges the capacitor ctw, with the constant current icwd. if the lower threshold vwlth is reached, a watchdog reset is generated. to prevent this the microcontroller must generate a positive edge during the discharge of the capacitor before the voltage has reached the threshold vwlth. in order to calculate the minimum time t, during which the micro-controller must output the positive edge, the following equation can be used: (vwhth-vwlth) x ctw = icwd x t every wi positive edge switches the current sour ce from discharging to charging. the same happens when the lower threshold is reached. when the voltage reaches the upper threshold, vwhth, the current switches from charging to discharging. the result is a saw-tooth voltage at the watchdog timer capacitor ctw. figure 5. watchdog timing diagram wi vo vcr res < trr trr tosc trd = 512 tosc vout_th vrhth vrlth wi vcw res vwlth vwhth twop twol vwlth obsolete product(s) - obsolete product(s)
l4989 package and packing information 13/19 4 package and packing information 4.1 ecopack ? packages 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. 4.2 so-8 package information figure 6. so-8 package dimensions obsolete product(s) - obsolete product(s)
package and packing information l4989 14/19 table 9. so-8 mechanical data symbol millimeters min. typ. max. a 1.75 a1 0.10 0.25 a2 1.25 b 0.28 0.48 c 0.17 0.23 d (1) 4.80 4.90 5.00 e 5.80 6.00 6.20 e1 (2) 3.80 3.90 4.00 e1.27 h 0.25 0.50 l 0.40 1.27 l1 1.04 k0 8 ccc 0.10 1. dimensions d does not include mold flash, protrusions or gate burrs. mold flash, potrusions or gate burrs shall not exceed 0.15mm in total (both side). 2. dimension ?e1? does not include interlead flash or pr otrusions. interlead flash or protrusions shall not exceed 0.25mm per side. obsolete product(s) - obsolete product(s)
l4989 package and packing information 15/19 4.3 so-20 package information figure 7. so-20 package dimensions table 10. so-20 mechanical data symbol millimeters min. typ. max. a 2.35 2.65 a1 0.10 0.30 b 0.33 0.51 c 0.23 0.32 d (1) 1. ?d? dimension does not include mold flash, protusions or gat e burrs. mold flash, protusions or gate burrs shall not exceed 0.15mm per side. 12.60 13.00 e 7.40 7.60 e1.27 h 10.0 10.65 h 0.25 0.75 l 0.40 1.27 k0 8 ddd 0.10 obsolete product(s) - obsolete product(s)
package and packing information l4989 16/19 4.4 so-8 packing information figure 8. so-8 tube shipment (no suffix) figure 9. so-8 tape and reel shipment (suffix ?tr?) all dimensions are in mm. base q.ty 100 bulk q.ty 2000 tube length ( 0.5) 532 a 3.2 b 6 c ( 0.1) 0.6 c b a tape dimensions according to electronic industries association (eia) standard 481 rev. a, feb. 1986 all dimensions are in mm. tape width w 12 tape hole spacing p0 ( 0.1) 4 component spacing p 8 hole diameter d (+0.1/-0) 1.5 hole diameter d1 (min) 1.5 hole position f ( 0.05) 5.5 compartment depth k (max) 4.5 hole spacing p1 ( 0.1) 2 top cover tape end start no components no components components 500mm min 500mm min empty components pockets saled with cover tape. user direction of feed reel dimensions all dimensions are in mm. base q.ty 2500 bulk q.ty 2500 a (max) 330 b (min) 1.5 c ( 0.2) 13 f 20.2 g (+ 2 / -0) 12.4 n (min) 60 t (max) 18.4 obsolete product(s) - obsolete product(s)
l4989 package and packing information 17/19 4.5 so-20 packing information figure 10. so-20 tube shipment (no suffix) figure 11. so-20 tape and reel shipment (suffix ?tr?) base q.ty 40 bulk q.ty 800 tube length ( 0.5) 532 a 3.5 b 13.8 c ( 0.1) 0.6 a c b base q.ty 1000 bulk q.ty 1000 a (max) 330 b (min) 1.5 c ( 0.2) 13 d 20.2 g (+ 2 / -0) 24.4 n (min) 60 t (max) 30.4 tape dimensions according to electronic industries association (eia) standard 481 rev. a, feb. 1986 all dimensions are in mm. tape width w 24 tape hole spacing p0 ( 0.1) 4 component spacing p 12 hole diameter d (+0.1/-0) 1.5 hole diameter d1 (min) 1.5 hole position f ( 0.05) 11.5 compartment depth k (max) 6.5 hole spacing p1 ( 0.1) 2 top cover tape end start no components no components components 500mm min 500mm min empty components pockets saled with cover tape. user direction of feed reel dimensions obsolete product(s) - obsolete product(s)
revision history l4989 18/19 5 revision history table 11. document revision history date revision changes mar-2004 1 initial release 13-feb-2007 2 changed document maturity status. added so-8 packing information and so-20 packing information . 18-nov-2008 3 document reformatted and restructured. added table 1: device summary . added list of contents, tables and figures. added ecopack ? packages information. obsolete product(s) - obsolete product(s)
l4989 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 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 obsolete product(s) - obsolete product(s)

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