microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 1 copyright ? 2000 rev. 1.0c, 2001-11-16 www. microsemi . com lx8610-xx 1a bicmos very low dropout regulators p roduction d atasheet a microsemi company l infinity description description description description the lx8610 family are positive very low dropout regulators. they are designed to provide a power supply for very low headroom applications, such as 3.3v? 2.5v. bicmos technology allows an effective series pass element resis- tance, r ds(on) of 250m ? resulting in a typical dropout voltage of 250mv at 1a. low quiescent current and logic- controlled shutdown help conserve battery life and increase system efficiency. typical quiescent current is under 400a irrespective of load current, while the shutdown current is only 10a. the device will enter shutdown mode when the shdn pin is pulled low. thermal & short-circuit current limiting: the lx8610 limits the current when the output is shorted, so protecting sensitive load circuits. the device will also turn off if the junction temperature exceeds 155c. available in small outline sot-223 and 8-pin soic: adjustable versions use the 8-pin soic and fixed output voltage devices are supplied in the 3- lead sot-223. important: for the most current data, consult microsemi ?s website: http://www.microsemi.com key features key features key features key features dropout voltage typically 250ma at 1a and 50mv at 10ma low quiescent current, under 400a, irrespective of load shutdown current 10a adjustable output version in 8- pin soic package fixed outputs of 2.5v, 3.3v available in 3-pin sot-223 package low reverse leakage current short-circuit and thermal shutdown protection applications/benefit applications/benefit applications/benefit applications/benefits s s s 3.3v & 2.5v supplies for memory, microprocessors, clock circuits, etc. portable equipment product highlight product highlight product highlight product highlight shdn* * adjustable version in 8 lead package only. reverse voltage sense thermal shutdown v in gnd adj* v out current limit charge pump r a r b lx8610-xx simplified block diagram 1.25v reference current v in /2 lx8610-00 lx8610-25 lx8610-33 25k 25k 41k 25k r a r b -- + - package order info t j ( c) o utput v oltage st p lastic sot-223 3- pin dm plastic power soic 8-pin 3.3 lx8610-33cst lx8610-33cdm 2.5 lx8610-25cst lx8610-25cdm 0 to 125c adj (00) ? lx8610-00cdm note: available in tape & reel. append the letter ?t? to the part number. (i.e. lx8610cdmt) l l x x 8 8 6 6 1 1 0 0 - - x x x x
microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 2 copyright ? 2000 rev. 1.0c, 2001-11-16 www. microsemi . com lx8610-xx 1a bicmos very low dropout regulators p roduction d atasheet a microsemi company l infinity absolute maximum rat absolute maximum rat absolute maximum rat absolute maximum ratings ings ings ings input voltage (v in ).......................................................................................................6.5v shdn pin..............................................................................................-0.3v to v in +0.3v output current ................................................................................................................ 1a operating junction temperature plastic (st & dm) packages................................. 125c storage temperature....................................................................................-65c to 150c lead temperature (soldering, 10 seconds)............................................................... 300c note: exceeding these ratings could cause damage to the device. all voltages are with respect to ground. currents are positive into, negative out of specified terminal. package pin out package pin out package pin out package pin out 1 2 3 v in gnd/hs v out tab is gnd st package (top view) 1 2 3 45 6 7 8 v out v in shdn adj gnd/hs gnd/hs gnd/hs gnd/hs dm package (top view) heat sink approach heat sink approach heat sink approach heat sink approach thermal data thermal data thermal data thermal data st plastic sot-223 package 3-pin thermal resistance - junction to tab , jt 15c/w thermal resistance - junction to ambient, ja 150 c/w dm plastic soic package 8-pin thermal resistance - junction to tab , jt 30 c/w thermal resistance - junction to ambient, ja 90 c/w junction temperature calculation: t j = t a + (p d x ja ). the ja numbers are guidelines for the thermal performance of the device/pc-board system. all of the above assume no ambient airflow. ja can be improved with package soldered copper area over backside ground plane or internal power plane . ja can vary from 45c/w > 75c/w depending on mounting technique. see table below for thermal resistance guidelines : copper area (topside)* copper area (backside)* board area thermal resistance ( ja ) st (sot-223) 2.0 sq? (1290mm 2 ) 1.0 sq? (645 mm 2 ) 2.0 sq? (1290mm 2 ) 45c/w 1.0 sq? (645 mm 2 ) 0.5 sq? (323 mm 2 ) 1.0 sq? (645 mm 2 ) 50c/w 0.5 sq? (323 mm 2 ) 0.1 sq? (65 mm 2 ) 0.5 sq? (323 mm 2 ) 60c/w 0.25 sq? (161 mm 2 ) 0.1 sq? (65 mm 2 ) 0.25 sq? (161 mm 2 ) 70c/w dm (soic) 2.0 sq? (1290mm 2 ) 1.0 sq? (645 mm 2 ) 2.0 sq? (1290mm 2 ) 60c/w 1.0 sq? (645 mm 2 ) 0.5 sq? (323 mm 2 ) 1.0 sq? (645 mm 2 ) 67c/w 0.5 sq? (323 mm 2 ) 0.1 sq? (65 mm 2 ) 0.5 sq? (323 mm 2 ) 70c/w 0.25 sq? (161 mm 2 ) 0.1 sq? (65 mm 2 ) 0.25 sq? (161 mm 2 ) 75c/w *tab of device attached to topside copper, or leads 2,3,5,6 of soic package possible heat sink approaches using pcb copper 1 2 4 3 5 6 8 7 p p a a c c k k a a g g e e d d a a t t a a
microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 3 copyright ? 2000 rev. 1.0c, 2001-11-16 www. microsemi . com lx8610-xx 1a bicmos very low dropout regulators p roduction d atasheet a microsemi company l infinity functional pin descr functional pin descr functional pin descr functional pin description iption iption iption p in n ame d escription v in positive supply input for the regulator. bypass to gnd with at least 2.2f of low esr, esl capacitance if supply source is further than 1 inch from the device. v out output for the regulator. it is recommended to bypass to gnd with at least 10f although this is not required for regulation, rather it is needed for transient response. size your output capacitor to meet the transient loading requirement. if you have a very dynamic load, a larger capacitor will improve the response to these load steps. gnd/hs reference ground. the input and output bypass capacitors should be connected to this pin. in addition the tab on the sot-223 package and pins 2,3,6, and 7 on the soic package are also used for heat sinking the device. adj feedback pin for the regulator. for the lx8610-00, the output voltage can be set by two external resistors with the following relationship: v out = 1.25v * (1 + r a / r b ) where r a is the resistor connected between v out and adj, and r b is the resistor connected between adj and gnd. shdn shutdown input. this pin has a threshold of about v in / 2, it should be actively pulled high to enable the regulator. this can be accomplished with a resistive pull-up. when low, it turns off the regulator and puts the device in a low current shutdown state. typical application typical application typical application typical application v in lx8610-00 in gnd adj out v out v ref c in c out r a r b 1 8 2,3 6,7 4 5 ? ? ? ? ? ? + = b a r r v v ref out 1 shdn figure 1 ? typical application p p a a c c k k a a g g e e d d a a t t a a
microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 4 copyright ? 2000 rev. 1.0c, 2001-11-16 www. microsemi . com lx8610-xx 1a bicmos very low dropout regulators p roduction d atasheet a microsemi company l infinity recommended operatin recommended operatin recommended operatin recommended operating conditions g conditions g conditions g conditions lx8610 parameter symbol min typ max units input voltage v in 3.1 5.5 v load current (with adequate heatsinking) 10 1000 ma input capacitor (v in to gnd) 2.2 10 f output capacitor (v out to gnd) 10 22* f * size your output capacitor to meet the transient loading requirement. if you have a very dynamic load, a larger capacitor will improve the response to these load steps. electrical character electrical character electrical character electrical characteristics istics istics istics unless otherwise specified, the following specifications apply over the operating ambient temperature 0 c t a 125 c except where otherwise noted. test conditions: v in = v out + 1.5v; i out = 10ma; c in = 10f; c out = 22f; t j = t a . lx8610-xx parameter symbol test conditions min typ max units ! lx8610-33 fixed 3.3v, 1a t j = 25 c 3.25 3.3 3.35 output voltage v out v in = 3.8 to 5.5v, i out = 10ma to 1a 3.22 3.38 v line regulation v reg v in = 3.45v to 5.5v 4 8 mv load regulation i reg i out = 10ma to 1a 5 10 mv i out = 1a, v out = ? v out ?1% 0.25 0.45 i out = 0.5a, v out = ? v out ? 1% 0.15 0.25 dropout voltage (v do = v in ?v out ) v do i out = 10ma, v out = ? v out ? 1% 0.05 0.15 v short circuit current i sc v out = 0v 1.25 1.7 a i out = 10ma to 1a 400 600 quiescent current i q v in = 4.8v; v shdn < 0.8v 1 40 a 0v < v in < v out , v out <3.4v (at v out ) 400 650 a reverse leakage current i rev 0v < v in < v out , v out <3.4v (at v in ) -50 0 ma v shdn falling 0.8 (v in / 2) shutdown threshold * v shdn v shdn rising (v in / 2) v v shdn < 0.8v -2 shdn bias current * i shdn v shdn = 3v -1 a ! lx8610-25 fixed 2.5v, 1a t j = 25 c 2.46 2.5 2.54 output voltage v out v in = 3.1v, i out = 10ma to 1a 2.44 2.5 2.56 v line regulation v reg v in = 3.1v to 5.5v, i out = 10ma 4 8 mv load regulation i reg i out = 10ma to 1a 5 10 mv i out = 1a, v out = ? v out ?1% 0.25 0.45 i out = 0.5a, v out = ? v out ? 1% 0.15 0.25 dropout voltage (v do = v in ?v out ) v do i out = 10ma, v out = ? v out ? 1% 0.05 0.15 v short circuit current i sc v out = 0v 1.25 1.7 a i out = 10ma to 1a 300 600 quiescent current i q v in = 4.8v; v shdn < 0.8v 1 40 a 0v < v in < v out , v out < 2.6v (at v out ) 400 650 a reverse leakage current i rev 0v < v in < v out , v out <2.6v (at v in ) -50 0 ma v shdn falling 0.8 v in / 2 shutdown threshold * v shdn v shdn rising (v in / 2) v v shdn < 0.8v -2 shdn bias current * i shdn v shdn = 3v -1 a e e l l e e c c t t r r i i c c a a l l s s
microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 5 copyright ? 2000 rev. 1.0c, 2001-11-16 www. microsemi . com lx8610-xx 1a bicmos very low dropout regulators p roduction d atasheet a microsemi company l infinity electrical character electrical character electrical character electrical characteristics istics istics istics (continued) (continued) (continued) (continued) lx8610-xx parameter symbol test conditions min typ max units ! lx8610-00 adjustable output, 1a t j = 25 c 1.23 1.22 1.27 reference voltage v ref v in = 3.1v, i out = 10ma to 1a 1.22 1.25 1.28 v line regulation v reg v in = 3.1v to 5.5v, i out = 10ma 4 8 mv load regulation i reg i out = 10ma to 1a 7 15 mv short circuit current i sc v out = 0v 1.25 1.7 a i out = 1a, v in > 4v 0.25 0.45 i out = 0.5a, v in > 3v 0.15 0.25 dropout voltage (v do = v in ?v out ) v do i out = 10ma, v in > 3v 0.05 0.15 v quiescent current i out = 10ma to 1a, v in = 5.5v 400 600 quiescent current in shutdown i q v in = 4.8v; v shdn < 0.8v 1 40 a 0v < v in < v out , v out < 5.5v (at v out ) 400 650 a reverse leakage current i rev 0v < v in < v out , v out <5.5v (at v in ) -50 0 ma bias current at adj pin i bias 100 na v shdn falling 0.8 (v in / 2) shutdown threshold * v shdn v shdn rising (v in / 2) v v shdn < 0.8v -2 shdn bias current * i shdn v shdn = 3v -1 a * note: shutdown threshold and shutdown bias current apply only to 8-pin soic package outline versions dropout voltage vs. dropout voltage vs. dropout voltage vs. dropout voltage vs. output current output current output current output current lx8610 dropout vs. load vs. temp 0 50 100 150 200 250 300 350 0 0 .2 5 0 .5 0 .7 5 1 0 25 75 100 125 figure 2 ? dropout voltage vs. output current (typical ? lx8610-25cst) e e l l e e c c t t r r i i c c a a l l s s
microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 6 copyright ? 2000 rev. 1.0c, 2001-11-16 www. microsemi . com lx8610-xx 1a bicmos very low dropout regulators p roduction d atasheet a microsemi company l infinity mechanical diminsion mechanical diminsion mechanical diminsion mechanical diminsions s s s st 3-pin plastic sot-223 f j c a i h g e 13 2 k d b1 l b m illimeters i nches dim min max min max a 1.55 1.80 0.061 0.071 b 0.65 0.85 0.026 0.033 b1 2.95 3.15 0.116 0.124 c 0.25 0.35 0.010 0.014 d 6.30 6.70 0.248 0.264 e 3.30 3.70 0.130 0.146 f 2.30 bsc 0.0905 bsc g 4.60 bsc 0.181 bsc h 6.71 7.29 0.264 0.287 i ? 0.91 ? 0.036 j 0.02 0.10 .0008 .004 k 10 max 10 max l .084 1.04 0.033 0.041 dm 8-pin plastic soic a p g k l f c d j m b m illimeters i nches dim min max min max a 4.83 5.00 0.190 0.197 b 3.81 3.94 0.150 0.155 c 1.35 1.75 0.053 0.069 d 0.33 0.51 0.013 0.020 f ? 0.77 ? 0.030 g 1.27 bsc 0.050 bsc j 0.19 0.25 0.007 0.010 k 0.13 0.25 0.005 0.010 l 4.80 5.21 0.189 0.205 m ? 8 ? 8 p 5.79 6.20 0.228 0.244 *lc ? 0.10 ? 0.004 *lead coplanarity note: dimensions do not include mold flash or protrusions; these shall not exceed 0.155mm(.006?) on any side. lead dimension shall not include solder coverage . m m e e c c h h a a n n i i c c a a l l s s
microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 7 copyright ? 2000 rev. 1.0c, 2001-11-16 www. microsemi . com lx8610-xx 1a bicmos very low dropout regulators p roduction d atasheet a microsemi company l infinity notes notes notes notes production data ? information contained in this document is proprietary to linfinity and is current as of publication date. this document may not be modified in any way without the express written consent of linfinity. product processing does not necessarily include testing of all parameters. linfinity reserves the right to change the configuration and performance of the product and to discontinue product at any time. n n o o t t e e s s
?? products?|?applications?|?our focus?|?contact?|?news?|?order? ????site map home ?>? products ?> power?management ?>? low?drop?out?regulator?-?positive?adjustable ?>?lx8610-00cst ? lx8610-00cst???(#45619) ? low drop out regulator - positive adjustable division integrated prod (gg) datasheet msc1720.pdf mil-spec (none) shipping (none) qual data (none) description the lx8610 family are positive absolute maximum ratings ?symbol ?max ?unit output current ? i o ?1 ?a input voltage ? v in ?5.5 ?v electrical characteristics ?symbol ?min ? typ ?max ?unit dropout voltage ? d v ? ? ?0.6 ?v reference voltage ? v ref ?1.25 ? ?4.9 ?v ? ? ? package sot-223_power(sm) * no drawing available ? msc 2002, all rights reserved file:///g|/imaging/bitting/cpl/20021014/10142002_10/msco/10142002_html/lx8610-00cst.htm [10/16/2002 2:04:40 pm]
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