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copyright ? anpec electronics corp. rev. a.2 - oct., 2003 apl1541 www.anpec.com.tw 1 anpec reserves the right to make changes to improve reliability or manufacturability without notice, and advise customers to obtain the latest version of relevant information to verify before placing orders. 1a low dropout fast response positive adjustable regulator and fixed 3.3v nc v in v out nc adj/gnd apl1541-33 4 3 2 18 7 6 5 v out v out v out ? ? ? ? ? guaranteed output voltage accuracy within 2% ? ? ? ? ? fast transient response ? ? ? ? ? guaranteed dropout voltage at multiple cur- rents ? ? ? ? ? load regulation : 0.1% typ. ? ? ? ? ? line regulation : 0.03% typ. ? ? ? ? ? low dropout voltage : 1.1v typ. at i out =1a ? ? ? ? ? current limit : 1a typ. at t j =125 c ? ? ? ? ? on-chip thermal limiting : 150 c typ. ? ? ? ? ? adjustable output : 1.25~7.75v ? ? ? ? ? standard 8-pin so power package features applications ? ? ? ? ? peripheral cards ? ? ? ? ? active scsi terminators ? ? ? ? ? low voltage logic supplies ? ? ? ? ? post regulator for switching power supply general description the apl1541 is a low dropout three-terminal adjust- able regulators with 1a output current capability. in order to obtain lower dropout voltage and faster tran- sient response, which is critical for low voltage ap- plications , the apl1541 has been optimized. the device is available in an adjustable version and fixed output voltages of 3.3v, the output available voltage range is from 1.25~7.75v with an input sup- ply below 12v. dropout voltage is guaranteed at a maximum of 1.3v at 1a. current limit is trimmed to ensure specified output current and controlled short-circuit current. on-chip thermal limiting provides protection against any com- bination of overload that would create excessive junc- tion temperatures. the apl1541 is available in the industry standard 8- pin so power package which can be used in appli- cations where space is limited. pin description front view for so - 8
copyright ? anpec electronics corp. rev. a.2 - oct., 2003 apl1541 www.anpec.com.tw 2 ordering and marking information symbol parameter rating unit v i input voltage 13.2 v t j operating junction temperature range control section power transistor 0 to 125 0 to 150 c t stg storage temperature range -65 to +150 c t l lead temperature (soldering, 10 second) 260 c absolute maximum ratings electrical characteristics apl1541 symbol parameter test conditions min. typ. max. unit v ref reference voltage apl1541 10ma i out 1a, 1.4v (v in -v out ) 9.75v, t j =0~125 c 1.225 1.250 1.275 v v out output voltage apl1541-33 t j =0~125 c, 0 i out 1a, 4.75v v in 12v, 3.235 3.300 3.365 v reg line line regulation apl1541 apl1541-33 t j =0~125 c i out = 10ma, 1.5v (v in -v out ) 9.75v, (note1) i out = 0a, 4.75v (v in -v out ) 7.75v, (note 1) 0.03 1 0.2 6 % mv reg load load regulation apl1541 apl1541-33 t j =0~125 c (v in -v out ) =3v, 0 i out 1a ,(note 1) v in =4.75v, 0 i out 1a ,(note 1) 0.1 1 0.4 10 % mv i out =100ma ,t j =0~125 c 11.1 v d dropout voltage i out =500ma ,t j =0~125 c i out =1a ,t j =0~125 c 1.05 1.1 1.2 1.3 v package code k : sop-8 temp. range c : 0 to 70 c handling code tu : tube tr : tape & reel voltage code 33: 3.3v blank : adjustable version lead free code l : lead free device blank : orginal device apl1541- handling code temp. range package code voltage code apl1541 xxxxx xxxxx - date code apl1541- apl1541 xxxxx33 xxxxx - date code apl1541- 33 : lead free code
copyright ? anpec electronics corp. rev. a.2 - oct., 2003 apl1541 www.anpec.com.tw 3 electrical characteristics cont. apl1541 symbol parameter test conditions min. typ. max. unit i limit current limit (v in -v out )=5v, t j =25 c 1 a i adj adjust pin current apl1541 (v in -v out ) =3v, i out =10ma, t j =0~125 c 60 120 a ? i adj adjust pin current change apl1541 t j = 0~125 c, 10ma i out 1a, 1.4v (v in -v out ) 9.75v 0.2 5 a i o minimum load current apl1541 t j =0~125 c, (v in -v out )=9.75v, (note 3) 1.7 ma psrr ripple rejection f ripple =120hz, v ripple =1v p-p, (v in -v out ) =3v, t j =0~125 c 60 75 db t r thermal regulation t j =25 c, 30ms pulse 0.01 0.02 %/ w t s temperature stability 0.5 % l s long -term stability t j =125 c,1000hrs. 0.3 % v n rms output noise t j =25 c,10hz f 10khz, (% of v out ) 0.003 % th thermal resistance junction to case, at tab junction to ambient 15 50 c/ w i q quiescent current apl1541-33 t j =0~125 c, v in 12v 5.5 10 ma note 1: see thermal regulation specifications for changes in output voltage due to heating effects. load line regulations are mea- sured at a constant junction temperature by low duty cycle pulse testing. note 2: dropout voltage is specified over the full output current range of the device. dropout voltage is defined as the minimu m input/ output differential measured at the specified output current. test points and limits are also shown on the dropout voltage curv e. note 3: minimum load current is defined as the minimum output current required to maintain regulation.
copyright ? anpec electronics corp. rev. a.2 - oct., 2003 apl1541 www.anpec.com.tw 4 application circuits apl1541 in out adj v in v out 10uf c 1* r1 121 ? 100uf c 2* r2 1k 1.25v to 7.75v adjustable regulator *needed if device is far from filter capacitors v out = 1.250v x r1+r2 r1 apl1541-33 in out gnd v in =5v 10uf 10uf v out =3.3v apl1541 in out adj v in v out r2 365 ? 1% c1 10uf 150uf r1 121 ? 10uf improving ripple rejection *c1 improves ripple rejection.xc should be approximately equal to r1 at ripple frequency apl1541 in out adj v in 5v 10uf 121 ? 1% 100uf 1k 365 ? 1% ttl 1k 5v regulator with shutdown simple 5v to 3.3v regulation
copyright ? anpec electronics corp. rev. a.2 - oct., 2003 apl1541 www.anpec.com.tw 5
0.9 0.95 1 1.05 1.1 1.15 1.2 1.25 0 0.2 0.4 0.6 0.8 1 0 1 2 3 4 5 6 -20 30 80 130 180 -0.05 0 0.05 0.1 0.15 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 -100 100 300 500 700 900 -0.03 -0.02 -0.01 0 0.01 0.02 typical characteristics load transietn response output current (a) time ( s) c in =10 f c out =10 f tantalum v in =5v apl1541-33 line transient response apl1541-33 input voltage (v) time ( s) c in =10 f c out =10 f tantalum i out =0.1a dropout voltage vs. output current dropout voltage (v) output current (a) apl1541-33 output voltage (v) input voltage (v) output voltage vs. input voltage apl1541-33
copyright ? anpec electronics corp. rev. a.2 - oct., 2003 apl1541 www.anpec.com.tw 6 50 52 54 56 58 60 62 64 66 68 70 -50 -25 0 25 50 75 100 125 1 1.2 1.4 1.6 1.8 2 2.2 2.4 5 7 9 11 13 0 1 2 3 4 5 6 024681012 typical characteristics cont. input current vs. input voltage input current (ma) input voltage (v) apl1541-33 current limit vs. input voltage input voltage (v) current limit (a) apl1541-33 output voltage vs. temperature temperature (c) output voltage (v) adjustable pin current vs. temperature adjustable pin current ( a) temperature (c) apl1541-33 apl1541-adj
copyright ? anpec electronics corp. rev. a.2 - oct., 2003 apl1541 www.anpec.com.tw 7 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 -50 0 50 100 150 2 3 4 5 6 7 8 -50 -25 0 25 50 75 100 125 typical characteristics cont. temperature (c) apl1541-33 input current vs. tmeperature temperature (c) input current (ma) current limit vs. temperature current limit (a) apl1541-33 v in -v out =5v psrr vs. frequency frequency (hz) psrr (db) -100 +0 -90 -80 -70 -60 -50 -40 -30 -20 -10 10 200k 20 50 100 200 500 1k 2k 5k 10k 20k 50k v in -v out >=vdropout v in -v out >=3v c adj =22 f i out =0.1a vripple=1v p - p apl1541-adj
copyright ? anpec electronics corp. rev. a.2 - oct., 2003 apl1541 www.anpec.com.tw 8 application information output voltage the apl1541 develops a 1.25v reference voltage be- tween the output and the adjust terminal. by placing a resistor between these two terminals, a constant current is caused to flow through r1 and down through r2 to set the overall output voltage. normally this current is chosen to be the specified minimum load current of 10ma. for fixed voltage devices r1 and r2 are included in the device. v in apl1541 out in adj v ref r1 r2 v out i adj 60 a figure 1. basic adjustable regulator v out = v ref (1+ )+i adj r2 r2 r1 load regulation when the adjustable regulator is used. load regula- tion will be limited by the resistance of the wire con- necting the regulator to the load. the data sheet speci- fication for load regulation is measured at the output pin of the device. best load regulation is obtained when the top of the resistor divider (r1) is tied directly to the output pin of the device, not to the load. for fixed voltage devices the top of r1 is internally con- nected to the output, and the ground pin can be con- nected to low side of the load. if r1 were connected to the load, rp is multiplied by the divider ratio, the effective resistance between the regulator and the load would be: rp x (1+ ), rp = parasitic line resistance r2 r1 v in apl1541 out in adj r1 r2 rp parasitic line resistance connect r1 to case connect r2 to load r l figure 2. connections for best load regulation input capacitor an input capacitor of 10 f or greater is recommended. tantalum, or aluminum electrolytic capacitors can be used for bypassing. larger values will improve ripple rejection by bypassing the input to the regulator. output capacitor the apl1541 requires an output capacitor to main- tain stability and improve transient response. proper capacitor selection is important to ensure proper operation. the apl1541 output capacitor selection is dependent upon the esr (equivalent series resistance) of the output capacitor to maintain stability. when the output capacitor is 10uf or greater, the out- put capacitor should have an esr less than 1 ?. this will improve transient response as well as promote stability. a low-esr solid tantalum capacitor works extremely well and provides good transient response and stability over temperature.
copyright ? anpec electronics corp. rev. a.2 - oct., 2003 apl1541 www.anpec.com.tw 9 application information (cont.) output capacitor (cont.) aluminum electrolytics can also be used, as long as the esr of the capacitor is <1 ? . the value of the output capacitor can be increased without limit. higher capacitance values help to improve transient response and ripple rejection and reduce output noise. ripple rejection the curves for ripple rejection were generated using an adjustable device with the adjust pin bypassed. with a 22 f bypassing capacitor 75db ripple rejec- tion is obtainable at any output level. the impedance of the adjust pin capacitor, at the ripple frequency, should be < r1. r1 is normally in the range of 100 ? - 200 ? . the size of the required adjust pin capacitor is a function of the input ripple frequency. at 120hz, with r1=100 ? , the adjust pin capacitor should be 13 f. for fixed voltage devices, and adjustable de- vices without an adjust pin capacitor, the output ripple will increase as the ratio of the output voltage to the reference voltage (v out /v ref ). apl1541 has thermal protection which limits junction temperature to 150c. however, device functionality is only guaranteed to a maximum junction tempera- ture of +125c. the thermal resistance for each ap- plication will be affected by thermal interactions with other components on the board. some experimenta- tion will be necessary to determine the actual value. the power dissipation of apl1541 is equal to : thermal considerations p d = (v in - v out ) x i out maximum junction temperature is equal to : t junction = t ambient + (p d x ja ) note: t junction must not exceed 125c
copyright ? anpec electronics corp. rev. a.2 - oct., 2003 apl1541 www.anpec.com.tw 10 packaging information millimeters inches dim min. max. min. max. a 1.35 1.75 0.053 0.069 a1 0.10 0.25 0.004 0.010 d 4.80 5.00 0.189 0.197 e 3.80 4.00 0.150 0.157 h 5.80 6.20 0.228 0.244 l 0.40 1.27 0.016 0.050 e1 0.33 0.51 0.013 0.020 e2 1.27bsc 0.50bsc 18 8 h e e1 e2 0.015x45 d a a1 0.004max. 1 l sop-8 pin ( reference jedec registration ms-012)
copyright ? anpec electronics corp. rev. a.2 - oct., 2003 apl1541 www.anpec.com.tw 11 physical specifications pre-heat temperature 183 c peak temperature time temperature classification reflow profiles convection or ir/ convection vpr average ramp-up rate(183 c to peak) 3 c/second max. 10 c /second max. preheat temperature 125 25 c) 120 seconds max temperature maintained above 183 c 60 ? 150 seconds time within 5 c of actual peak temperature 10 ?20 seconds 60 seconds peak temperature range 220 +5/-0 c or 235 +5/-0 c 215-219 c or 235 +5/-0 c ramp-down rate 6 c /second max. 10 c /second max. time 25 c to peak temperature 6 minutes max. package reflow conditions pkg. thickness 2.5mm and all bgas pkg. thickness < 2.5mm and pkg. volume 350 mm3 pkg. thickness < 2.5mm and pkg. volume < 350mm3 convection 220 +5/-0 c convection 235 +5/-0 c vpr 215-219 c vpr 235 +5/-0 c ir/convection 220 +5/-0 c ir/convection 235 +5/-0 c terminal material solder-plated copper (solder material : 90/10 or 63/37 snpb) lead solderability meets eia specification rsi86-91, ansi/j-std-002 category 3. reference jedec standard j-std-020a april 1999 reflow condition (ir/convection or vpr reflow)
copyright ? anpec electronics corp. rev. a.2 - oct., 2003 apl1541 www.anpec.com.tw 12 reliability test program test item method description solderability mil-std-883d-2003 245 c , 5 sec holt mil-std-883d-1005.7 1000 hrs bias @ 125 c pct jesd-22-b, a102 168 hrs, 100 % rh , 121 c tst mil-std-883d-1011.9 -65 c ~ 150 c, 200 cycles esd mil-std-883d-3015.7 vhbm > 2kv, vmm > 200v latch-up jesd 78 10ms , i tr > 100ma carrier tape a j b t2 t1 c t ao e w po p ko bo d1 d f p1 application a b c j t1 t2 w p e 330 162 +1.5 12.75+ 0.15 2 0.5 12.4 0.2 2 0.2 12 0. 3 8 0.1 1.75 0.1 f d d1 po p1 ao bo ko t sop- 8 5.5 1 1.55 +0.1 1.55+ 0.25 4.0 0.1 2.0 0.1 6.4 0.1 5.2 0. 1 2.1 0.1 0.3 0.013
copyright ? anpec electronics corp. rev. a.2 - oct., 2003 apl1541 www.anpec.com.tw 13 customer service anpec electronics corp. head office : 5f, no. 2 li-hsin road, sbip, hsin-chu, taiwan, r.o.c. tel : 886-3-5642000 fax : 886-3-5642050 taipei branch : 7f, no. 137, lane 235, pac chiao rd., hsin tien city, taipei hsien, taiwan, r. o. c. tel : 886-2-89191368 fax : 886-2-89191369 cover tape dimensions application carrier width cover tape width devices per reel sop- 8 12 9.3 2500

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