microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 1 copyright ? 2001 rev. 1.4b, 2005-05-04 www. microsemi . com lx8580a 7.5a ver y low dropout positive re g ulator p roduction d ata s heet tm ? description the lx8580a is a high- performance, very low dropout voltage regulator, designed for use with advanced microprocessors, micro controllers, or video graphics controllers. this product can be used with separate voltage supplies for the control and power sections, allowing a power regulation dropout voltage as low as 100mv @ 1.5a. in agp bus systems requiring regulation of 3.3v to 2.85v @ 3a, the lx8580a has a max dropout of 250mv making it an ideal power supply solution for today?s graphics applications. the lx8580a can also be used in a single voltage supply configuration with a dropout performance similar to that of the lx8584 (1.3v @ 7.5a). the lx8580a is supplied in a five- terminal to-220, to-263, or linfinity?s s-pak packages, which allows the implementation of remote (kelvin) voltage sensing. this sensing compensates for output voltage variations due to load changes and resistive voltage drops in connectors and board traces. typical load regulation measured at the sense pin is less that 1mv for a load current step of 7ma to 7.5a. the lx8580a is ideal for generating a secondary 2v-2.85v low voltage supply on a motherboard where a 3.3v supply is already available. important: for the most current data, consult microsemi ?s website: http://www.microsemi.com key features ? low dropout, 650mv at 7.5a output current in dual supply mode ? fast transient response ? remote sensing ? 1mv load regulation ? adjustable output applications/benefits ? microprocessor/micro controller supplies ? 3.3v to 2.85v voltage conversion ? high-current regulators ? post regulation for switching power supplies product highlight v ctrl v out + 1.3v max v out v pw r v out + v dropout lx8580a v pw r v ctrl 4 1 3 2 5 adjust sense output r 1 r 2 r l 2 1 2 1 r i r r v v adj ref out + ? ? ? ? ? ? ? ? + = package order info p plastic to-220 5-pin df s-pak 5-pin dd plastic to-263 5-pin t a ( c) d ropout v oltage rohs compliant transition dc: 0515 0 to 125 0.1v ? 0.7v LX8580A-00CP lx8580a- 00cdf lx8580a-00cdd note: available in tape & reel. append the letters ?tr? to the part number. (i.e. lx8580a-00cdd-tr) l l x x 8 8 5 5 8 8 0 0 a a
microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 2 copyright ? 2001 rev. 1.4b, 2005-05-04 www. microsemi . com lx8580a 7.5a ver y low dropout positive re g ulator p roduction d ata s heet tm ? absolute maximum ratings v ctrl input voltage.........................................................................................13v v pwr input voltage ............................................................................................7v power dissipation ......................................................................in ternally limited operating junction temperature.................................................................. 150 c storage temperature range...........................................................-65 c to 150 c lead temperature (soldering 180 seconds) ................................................ 300 c rohs peak package solder reflow temperatur e (40 second maximum e xposure) .......260c (+0, -5) 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 p p ackage (5-p in ) (top view) 1 2 3 tab is output 4 5 output v pwr v ctrl adjust sense dd p ackage (5-p in ) (top view) 1 sense output v pwr 2 3 tab is output 4 5 v ctrl adjust df p ackage (top view) tab is output 1 sense adjust output v ctrl v pwr 2 3 4 5 rohs 100% matte tin lead finish thermal data p plastic to-220 5-pin thermal resistance - junction to t ab , jt 3.0 c/w thermal resistance - junction to a mbient , ja 65 c/w dd plastic to-263 5-pin thermal resistance - junction to t ab , jt 3.0 c/w thermal resistance - junction to a mbient , ja 35 c/w df plastic s-pack 5-pin thermal resistance - junction to t ab , jt 3.0c/w thermal resistance - junction to a mbient , ja 35c/w junction temperature calculation: t j = t a + (p d x ja ). ja assume device is mounted on a 0.5 inch 2 copper pad. the ja numbers are guidelines for the thermal performance of the device/pc-board system. all of the above assume no ambient airflow. p p a a c c k k a a g g e e d d a a t t a a
microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 3 copyright ? 2001 rev. 1.4b, 2005-05-04 www. microsemi . com lx8580a 7.5a ver y low dropout positive re g ulator p roduction d ata s heet tm ? functional pin description p in n ame d escription 1 sense this pin is the positive side of the reference voltage for the device. with this pin it is possible to kelvin-sense the output voltage at the load. 2 adjust this pin is the negative side of the reference voltage fo r the device. ripple rejection can be improved by adding a small bypass capacitor from the adjust pin to gr ound. the capacitor value should be selected so that: where f r is the ripple frequency and r 1 is the value of the resistor between the adjust and sense leads of the lx8580a 3 output this is the regulated power output of the device 4 v ctrl this pin is the voltage supply pin for the control circuitry of the device. the current flow into this pin will be about 1% of the output current. please refer to the electrical characteristics section of the data sheet for dropout voltage for load conditions. 5 v pwr this is the collector of the power section of the lx8580a . the output load current is supplied through this pin. for the device to regulate, the voltage at this pin must be between 0.1v and 0.8v greater than the output voltage (higher output current require hi gher voltages differences between v pwr and output). typical application lx8580a v ctrl v pwr output sense adjust 5.0v 3.3v tantalum 100f tantalum 33f v out = 2.8v 500f r 1 r 2 2 adj 1 2 ref out r i r r 1 v v + ? ? ? ? ? ? ? ? + = r 1 = 121 ? r 2 = 150 ? p p a a c c k k a a g g e e d d a a t t a a 1 r r r f 2 1 c
microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 4 copyright ? 2001 rev. 1.4b, 2005-05-04 www. microsemi . com lx8580a 7.5a ver y low dropout positive re g ulator p roduction d ata s heet tm ? electrical characteristics unless otherwise specified, the following specifications apply over the operating ambient temperature 0 c t a 125 c. low duty cycle pulse testing techniques are used which maintains junction and case temperatures are equal to the ambient temperature. lx8580a parameter symbol test conditions min typ max units v ctrl = 2.75v, v pwr = 2v, i load = 10ma, t a =25 c 1.243 1.250 1.257 v ctrl = 2.7v to 6v, v pwr = 1.75v to 5.5v i load = 10ma to 4a 1.237 1.250 1.263 reference voltage v ref v ctrl = 2.7v to 6v, v pwr = 2.05v to 5.5v i load = 10ma to 7.5a 1.237 1.250 1.263 v v ctrl = 2.5v to 10v, v pwr = 1.75v to 5.5v i load = 10ma, t a =25 c 1 3 mv line regulation ? v ref (v in ) v ctrl = 2.5v to 10v, v pwr = 1.75v to 5.5v i load = 10ma 2 6 mv load regulation ? v ref (i out ) v ctrl = 2.75v, v pwr = 2.1v i load = 10ma to 7.5a (v adj = 0) 2 7 mv thermal regulation ? v out (pwr) 30ms pulse 0.002 0.020 %/w thermal resistance r jt control circuitry/power transistor 0.65 2.70 c/w ripple rejection v ctrl = v pwr = 3.75v avg, v ripple = 1v p-p v adj = 0, i out = 4a 60 80 db v ctrl = 2.75v, v pwr = 2.05v, i load = 100ma 3 10 v ctrl = 2.75v, v pwr = 2.05v, i load = 3a 30 50 v ctrl = 2.75v, v pwr = 1.75v, i load = 3a 33 55 v ctrl pin current (note 2) i ctrl v ctrl = 2.75v, v pwr = 2.05v, i load = 7.5a 70 120 ma adjust pin current i adj v ctrl = 2.75v, v pwr = 2.05v, i load = 0ma, v adj = 0 20 60 100 a current limit i out(max) v ctrl = 2.75v, v pwr = 2.05v, ? v out = 100mv, v adj = 0 7.7 9 a v pwr = 2.05, i load = 100ma 0.90 1.15 v pwr = 2.05, i load = 1.5a 1.00 1.15 v pwr = 2.05, i load = 3a 1.05 1.18 v pwr = 2.05, i load = 5a 1.06 1.20 dropout voltage (control section) minimum v ctrl (note 1) (v pwr - v out ) v ctrl -v out v pwr = 2.05, i load = 7.5a 1.10 1.30 v v ctrl = 2.75v, i load = 100ma 0.03 0.05 v ctrl = 2.75v, i load = 1.5a, t a = 85 c 0.10 0.13 v ctrl = 2.75v, i load = 1.5a 0.13 0.15 v ctrl = 2.75v, i load = 3a, t a = 85 c 0.20 0.25 v ctrl = 2.75v, i load = 3a 0.25 0.28 v ctrl = 2.75v, i load = 5a, t a = 85 c 0.38 0.43 v ctrl = 2.75v, i load = 5a 0.40 0.45 v ctrl = 2.75v, i load = 7.5a, t a = 85 c 0.52 0.65 dropout voltage (power section) minimum v pwr (note 1) (v pwr - v out ) (v adj = 0) v pwr -v out v ctrl = 2.75v, i load = 7.5a 0.59 0.70 v minimum load current v ctrl = 5v, v pwr = 3.3v, v adj = 0 note 3 5 10 ma note 1: dropout is caused by either minimum control voltage (v ctrl ) or minimum power voltage (v pwr ). both parameters are specified with respect to the output voltage. the specifications represent the minimum input/output voltage required to maintain 1% regulation. note 2: the control pin current is the drive current required for the output transistor. this current will track output curren t with roughly a 1:100 ratio. the minimum value is equal to the quiescent current of the device. note 3: minimum load current is defined as the amount of output current required to ma intain regulation. typically this curren t provides the bias to the external resistor divider networ k used to set the output voltage. e e l l e e c c t t r r i i c c a a l l s s
microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 5 copyright ? 2001 rev. 1.4b, 2005-05-04 www. microsemi . com lx8580a 7.5a ver y low dropout positive re g ulator p roduction d ata s heet tm ? simplified block diagram v ref voltage regulation amplifier thermal overload current limiting amplifier output v pw r sense adjust v ctrl b b l l o o c c k k d d i i a a g g r r a a m m
microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 6 copyright ? 2001 rev. 1.4b, 2005-05-04 www. microsemi . com lx8580a 7.5a ver y low dropout positive re g ulator p roduction d ata s heet tm ? characteristic curves reference voltage vs. temperature 1.2500 1.2505 1.2510 1.2515 1.2520 1.2525 1.2530 0255075100125 t j (c) v ref (volts) load regulation vs. output current 0.00 0.05 0.10 0.15 0.20 0 12 3 45 67 8 output current (a) output voltage deviation(%) v ctrl dropout, vpwr=3.25v 1.00 1.02 1.04 1.06 1.08 1.10 1.12 02468 output current (a) v ctrl dropout (v) vpwr dropout voltage vs. iout 0.0 0.1 0.2 0.3 0.4 0.5 0.6 01 23 456 78 pow er dropout (v) iout (a) 125c 85c 0c transient response ripple rejection 10 20 30 40 50 60 70 80 90 100 100 1000 10000 100000 frequency (hz) ripple rejection (db ) vout=1.25v vin=3.3v vripple=1vpp cout=820uf electrolytic +2.2uf ceramic cadj= 0 uf g g r r a a p p h h s s
microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 7 copyright ? 2001 rev. 1.4b, 2005-05-04 www. microsemi . com lx8580a 7.5a ver y low dropout positive re g ulator p roduction d ata s heet tm ? package dimensions p 5-pin plastic to-220 a g f b d c j r k n s t 15 m illimeters i nches dim min max min max a 14.23 16.51 0.560 0.650 b 9.66 10.66 0.380 0.420 c 3.56 4.82 0.140 0.190 d 0.46 0.89 0.018 0.035 f 3.56 4.06 0.140 0.160 g 3.40 0.134 j 0.31 1.14 0.012 0.045 k 12.70 14.73 0.500 0.580 n 6.80 typ 0.268 typ r 2.04 2.92 0.080 0.115 s 1.14 1.39 0.045 0.055 t 5.85 6.85 0.230 0.270 dd 5-pin plastic to-263 a b k i f h c d 0 -8 m n j seating plane e g m illimeters i nches dim min max min max a 10.03 10.67 0.395 0.420 b 8.51 9.17 0.335 0.361 c 4.19 4.59 0.165 0.181 d 1.14 1.40 0.045 0.055 e 0.330 0.51 0.013 0.020 f 0.74 0.89 0.029 0.035 g 1.57 1.83 0.062 0.072 h 2.29 2.79 0.090 0.110 i ? 1.65 ? 0.065 j 0 0.25 0 0.010 k 14.60 15.87 0.575 0.625 m 7 7 n 3 3 m m e e c c h h a a n n i i c c a a l l s s
microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 8 copyright ? 2001 rev. 1.4b, 2005-05-04 www. microsemi . com lx8580a 7.5a ver y low dropout positive re g ulator p roduction d ata s heet tm ? package dimensions df 5-pin plastic s-pak a b k f g j h c e i d l m m illimeters i nches dim min max min max a 9.27 9.52 0.365 0.375 b 7.87 8.13 0.310 0.320 c 1.78 2.03 0.070 0.080 d 8.03 bsc 0.316 bsc e 0.25 bsc 0.010 bsc f 0.63 0.79 0.025 0.031 g 1.70 bsc 0.067 bsc h 0.79 1.04 0.031 0.041 i 6.50 bsc 0.256 bsc j 0.03 0.13 0.001 0.005 k 10.41 10.67 0.410 0.420 l 0.25 bsc 0.01 bsc m 0.76 1.27 0.03 0.05 note: dimensions do not include mold flash or pr otrusions; these shall not exceed 0.155mm(.0 06?) 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 integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 9 copyright ? 2001 rev. 1.4b, 2005-05-04 www. microsemi . com lx8580a 7.5a ver y low dropout positive re g ulator p roduction d ata s heet tm ? notes production data ? information contained in this document is proprietary to microsemi and is current as of publication date. this document may not be modified in any way without the express written consent of microsemi. product processing does not necessarily include testing of all parameters. microsemi 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
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