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microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 1 copyright ? 2000 rev. 1.0b, 2001-02-20 www. microsemi . com lx8630-xx 3a bicmos very low dropout regulators p r o d uc ti o n d ata s heet a microsemi company

the lx8630 family are positive very low dropout regulators. they are designed to provide a power supply for very low headroom applications, such as 3.3v C 2.5v. bicmos technology allows an effective series pass element resistance, r ds(on) of 150m

dropout voltage of 450mv at 3a. low quiescent current and logic- controlled shutdown help conserve battery life and increase system efficiency. typical quiescent current is under 400 a irrespective of load current, while the shut

device will enter shutdown mode when the shdn pin is pulled low. thermal and short-circuit current limiting: the lx8630 limits the current when the output is shorted, protecting the sensitive load circuits. the device will also turn off if the junction temperature exceeds 150 available in popular to-220 and to-263 power packages: adjustable versions have five leads, and fixed output voltage devices are supplied in three lead packages. important: for the most current data, consult microsemi s website: http://www.microsemi.com dropout voltage typically 450mv at 3a and 50mv at 10ma low quiescent current, typically under 400a, irrespective of load shutdown current 10a adjustable output version in 5-pin to-220 & to-263 packages low reverse leakage current short-circuit and thermal shutdown protection

3.3v & 2.5v supplies for memory, microprocessors, clock circuits, etc. portable equipment * adjustable 5 lead version only reverse voltage sense thermal shutdown v in gnd adj* v out current limit charge pump r a r b lx8630-xx simplified block diagram 1.25v reference current v in /2 lx8630-00 lx8630-25 lx8630-33 25k 25k 41k 25k r a r b -- shdn* + -
t a ( c) output voltage p plastic to-220 3-pin p plastic to-220 5-pin dd plastic to-263 3-pin dd plastic to-263 5-pin 3.3 lx8630-33cp - lx8630-33cdd - 2.5 LX8630-25CP - lx8630-25cdd - 0 to 125 adj(00) - lx8630-00cp - lx8630-00cdd note: available in tape & reel. append the letter t to the part number. (i.e. lx8630-33cddt) l l x x 8 8 6 6 3 3 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. 1.0b, 2001-02-20 www. microsemi . com lx8630-xx 3a bicmos very low dropout regulators p r o d uc ti o n d ata s heet a microsemi company

p p lastic to-220 3-p in thermal resistance - junction to t ab , q jt 2.1 c/w thermal resistance - junction to ambient , q ja 60 c/w p p lastic to-220 5-p in thermal resistance - junction to t ab , q jt 2.1 c/w thermal resistance - junction to ambient , q ja 60 c/w dd p lastic to-263 3-p in thermal resistance - junction to t ab , q jt 2.1 c/w thermal resistance - junction to ambient , q ja 60 c/w dd p lastic to-263 5-p in thermal resistance - junction to t ab , q jt 2.1 c/w thermal resistance - junction to ambient , q ja 60 c/w junction temperature calculation: t j = t a + (p d x q ja ). the q ja numbers are guidelines for the thermal performance of the device/pc-board system. all of the above assume no ambient airflow. q ja can be improved with package soldered to 0.5in 2 copper area over backside ground plane or internal power plane . q ja can vary from 20c/w to > 40c/w depending on mounting technique. see table below for thermal resistance guidelines : copper area (topside)* copper area (backside)* board area thermal resistance ( q ja ) 2.5 sq (1613mm 2 ) 2.5 sq (1613mm 2 ) 2.5 sq (1613mm 2 ) 25c/w 1.0 sq (645 mm 2 ) 2.5 sq (1613mm 2 ) 2.5 sq (1613mm 2 ) 27c/w 0.17 sq (110 mm 2 ) 2.5 sq (1613mm 2 ) 2.5 sq (1613mm 2 ) 35c/w *tab of device attached to topside copper

dd p ackage (3- pin ) (top view) 1 v in gnd v out 2 3 tab is gnd dd p ackage (5-p in ) (top view) 1 v in gnd v out 2 3 tab is gnd 4 5 adj shdn p p ackage (5-p in ) (top view) 1 2 3 tab is gnd 4 5 gnd v out adj shdn v in p p ackage (3-p in ) (top view) 1 2 3 tab is gnd gnd v out v in input voltage (v in ) ......................................................................................................6.5v shdn pin..............................................................................................-0.3v to v in +0.3v operating junction temperature plastic (p & dd packages)................................................................................... 150 c storage temperature range ........................................................................-65 c to 150 c lead temperature (soldering, 10 seconds) ............................................................... 300 c note: exceeding these ratings could cause damage to the device. all voltages are with respect to ground. currents are p ositive into, ne g ative out of s p ecified terminal. 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. 1.0b, 2001-02-20 www. microsemi . com lx8630-xx 3a bicmos very low dropout regulators p r o d uc ti o n d ata s heet a microsemi company

v in positive supply input for the regulator. bypass to gnd with at
source is further than 1 inch from the device. v out !"# $%
& 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 reference ground. the input and output bypass capacitors should be connected to this pin. the tab on the to- 220 and to-263 packages along with the ground pin are also used for heatsinking the device. adj feedback pin for the regulator. for the lx8630-00, 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, r b is the resistor connected between adj and gnd pin. shdn shutdown pin. for the lx8630-00, 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.

lx8630-00 in shdn gnd adj out v in v out v ref c in c out r a r b 5 4 2 1 3 ? ? ? ? + = b a ref out r r 1 v v figure 1 C typical application p p i i n n d d e e s s c c r r i i p p t t i i o o n n
microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 4 copyright ? 2000 rev. 1.0b, 2001-02-20 www. microsemi . com lx8630-xx 3a bicmos very low dropout regulators p r o d uc ti o n d ata s heet a microsemi company

parameter symbol min. typ. max. units input voltage v in 3.0 5.5 v load current (with adequate heatsinking) 0.01 3 a input capacitor (v in to gnd) 10 100 output capacitor (v out to gnd) 22 220* * size your output capacitor to meet the transient loading requirement. if you have a very dynamic load, a larger capacitor wi ll improve the response to these load steps (see charts 2&3) (unless otherwise specified, the following specifications apply over the operating ambient temperatures for the lx8630-xxc with 0 c t a 125 c; v in = v out + 1.5v; i out = 10ma; c in = 10
' ( out )
' * j = t a . test conditions: low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.) lx8630-xx parameter symbol test conditions min typ max units lx8630-33 fixed 3.3v, 3a t j = 25 c 3.25 3.3 3.35 output voltage v out over temperature 3.22 3.38 v line regulation v reg v in = 3.9v to 5.5v 2 8 mv load regulation i reg i out = 10ma to 3 a 18 40 mv i out = 3a, out = -1% 0.4 0.6 i out = 1.5a, out = -1% 0.3 0.4 dropout voltage (v do = v in - v out ) v do i out = 10ma, out = -1% 0.05 0.15 v short circuit current i sc v out = 0v 5 6.5 a quiescent current i q i out = 10ma to 3a 400 600 0v < v in < v out , v out < 3.4v (at v out ) 50 650 reverse leakage current i rev 0v < v in < v out , v out < 3.4v (at v in ) -50 0 ma lx8630-25 fixed 2.5v, 3a t j = 25 c 2.46 2.5 2.54 output voltage v out over temperature 2.44 2.5 2.56 v line regulation v reg v in = 3.1v to 5.5v 2 6 mv load regulation i reg i out = 10ma to 3 a 14 30 mv i out = 3a, out = -1%, t j = 85c 0.4 0.6 i out = 1.5a, out = -1%, t j = 85c 0.3 0.45 dropout voltage (v do = v in - v out ) v do i out = 10ma, out = -1% 0.05 0.15 v short circuit current i sc v out = 0v 5 6.5 a quiescent current i q i out = 10ma to 3a 400 600 0v < v in < v out , v out < 2.6v (at v out ) 50 650 reverse leakage current i rev 0v < v in < v out , v out < 2.6v (at v in ) -50 0 ma 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. 1.0b, 2001-02-20 www. microsemi . com lx8630-xx 3a bicmos very low dropout regulators p r o d uc ti o n d ata s heet a microsemi company

lx8630-xx parameter symbol test conditions min typ max units lx8630-00 adjustable output, 3a t j = 25 c 1.23 1.25 1.27 reference voltage v ref over temperature 1.22 1.25 1.28 v line regulation v reg v in = (v o + 0.6v) to 5.5v @ adj pin (note 1) 2 4 mv load regulation i reg i out = 10ma to 3a @ adj pin 7 15 mv i out = 3a, out = -1%, t j = 85c 0.4 0.6 i out = 1.5a, out = -1%, t j = 85c 0.3 0.45 dropout voltage v do i out = 10ma, out = -1% 0.05 0.15 v short circuit current i sc v out = 0v 5 6.5 a quiescent current i out = 10ma to 3a 400 600 quiescent current in shutdown i q v in = 4.8v; v shdn <0.8v 1 40 0v < v in < v out , v out < 5.5v (at v out ) 50 650 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 note 1: v in min.

0 50 100 150 200 250 300 0.1 0.5 1.0 1.5 2.0 2.5 3.0 current load (amps) v-dropout (mv) +125 +25 -25 chart 1 C dropout voltage vs. output current (typical C lx8630-33ccd) 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. 1.0b, 2001-02-20 www. microsemi . com lx8630-xx 3a bicmos very low dropout regulators p r o d uc ti o n d ata s heet a microsemi company

v in = 3.3v chan 1 (top trace): v out 50mv/div at 2.5vdc chan 3 (lower trace): i out 1a/div with 10ma preload current input cap: 1 6mvgx 1500f sanyo cap output caps: 2 6mvgx 1500f sanyo cap v in = 5.0v chan 1 (top trace): v out 50mv/div at 2.5vdc chan 3 (lower trace): i out 1a/div with 10ma preload current input cap: 1 6mvgx 1500f sanyo cap output caps: 2 6mvgx 1500f sanyo cap chart 2 & 3 C lx8630-00ccd transient response note: adjustable resistors 10k ohms each g g r r a a p p h h 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. 1.0b, 2001-02-20 www. microsemi . com lx8630-xx 3a bicmos very low dropout regulators p r o d uc ti o n d ata s heet a microsemi company

dd 3-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 1.19 1.34 0.047 0.053 g 2.41 2.66 0.095 0.104 h 2.29 2.79 0.090 0.110 i C 1.65 C 0.065 j 0 0.25 0 0.010 k 14.60 15.87 0.575 0.625 m 7 7 n 3 3 dd 5-pin plastic to-263 a b k i f h c d 0 -8 m n j seating plane e g note: 1. 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 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 C 1.65 C 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 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 8 copyright ? 2000 rev. 1.0b, 2001-02-20 www. microsemi . com lx8630-xx 3a bicmos very low dropout regulators p r o d uc ti o n d ata s heet a microsemi company

p 3-pin plastic to-220 a g f q b d h c j r k l n s t u 123 m illimeters i nches dim min max min max a 14.22 15.88 0.560 0.625 b 9.65 10.67 0.380 0.420 c 3.56 4.83 0.140 0.190 d 0.51 1.14 0.020 0.045 f 3.53 4.09 0.139 0.161 g 2.54 bsc 0.100 bsc h 6.35 0.250 j 0.30 1.14 0.012 0.045 k 12.70 14.73 0.500 0.580 l 1.14 1.27 0.045 0.050 n 5.08 typ 0.200 typ q 2.54 3.05 0.100 0.120 r 2.03 2.92 0.080 0.115 s 1.14 1.40 0.045 0.055 t 5.84 6.86 0.230 0.270 u 0.508 1.14 0.020 0.045 p 5-pin plastic to-220 a g f b d c j r k n s t 15 note: 1. 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 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 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 9 copyright ? 2000 rev. 1.0b, 2001-02-20 www. microsemi . com lx8630-xx 3a bicmos very low dropout regulators p r o d uc ti o n d ata s heet a microsemi company

production data C 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

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