general description the LD1083 is a low dropout three terminal regulator with 7.5a output current capability. the output voltage is adjust able with the use of a resistor divider or fixed 1.5v/1.8v/2.5v/3.3v/5v. dropout voltage is guaranteed to be at maximum of 1.5v with the maximum output current. its low dropout voltage and fast transient response make it ideal for low voltage microprocessor applications. current limit and thermal protection provide pr otection against any overload condition that would create excessive junction temperatures. features ? 1.5v max. dropout voltage at 7.5a output current. ? fast transient response. ? extremely tight line and load regulation. ? current limiting and thermal protection. ? adjustable output voltage or fixed 1.5v, 1.8v,2.5v,3.3v,5.0v. applications ? mother board i/o power supplies ? microprocessor power supplies. ? high current regulator ? post regulator for switching supply. ? notebook computers block diagram LD1083 1 of 9 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
pin descriptions adj pin - providing vref=1.25v (typ.) for adjus table vout. vref=vout-vadj and iadj=60u a (typ.) /gnd pin- power ground. vout pin - adjustable output voltage. vin pin - power input. typical application circuit v ref =v out - v adj =1.25v (typ.) v out =v ref x (1+rf2/rf1)+ i adj x rf2 i adj =60ua ( typ.) (1) c1 needed if device is far away from filter capacitors. (2) c2 required for stability. ordering information LD1083 package type e:to-252 t:to-220 adj:adj m:to-263-2 output voltage 18:1.8v 33:3.3v 50:5.0v ma:to-263-3 15:1.5v 25:2.5v c LD1083 2 of 9 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
order number pin configuration LD1083ce (to-252) front view 1: adj (gnd) 2: vout (tab) 3: vin LD1083cm (to-263-2) front view 1: adj (gnd) 2: vout (tab) 3: vin LD1083cma (to-263-3) front view 1: adj (gnd) 2: vout (tab) 3: vin LD1083ct (to-220) front view 1: adj (gnd) 2: vout (tab) 3: vin absolute maximum ratings input voltage(note 1)....... ...... ...... .. .... ......?? ......... ......??? ..... ................. .? ........... 30v operating junction temperatur e range ..................???? ? ................ ...... ..... -20c~ 125c storage temperature range .......... ................ .....??? .?? ........... ...... ..... - 65c ~ 150c thermal resistance junction to case to-252 ?????????????..... ..... 15c/w to-263-3, to263-2, to-220.....??? .... ..... 6c /w thermal resistance junction to ambi ent to-252 ?????????? ..?..... ..... 100c/w (assume no ambient airflow, no heatsink) to -263-2 ? .....?? .....????? ... ..... ..... 60c /w to-263-3 ? ..?? ..?? .....?? ... ..... ..... 60c /w to-220 ? ....?? ....?????? .. ..... ..... 50c /w lead temperature (soldering) 10 se c. ............... ......??? ..? ..... .......?? ..? ....... ..... 260c LD1083 3 of 9 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
ver1.0 4 note 1: although the devices maximum operating vo ltage is limited, the dev ices are guaranteed to withstand transient input voltages up to 30v. for i nput voltages greater than the maximum operating input voltage some degradation of spec ifications will occur. for input/ output voltage differentials greater than12v, a minimum external load of 5ma is required to maintain regulation. electrical characteristics (vin 10v, tj=25c, io=10ma, unless otherwise specified) parameter test conditions min. typ. max. unit reference voltage LD1083 (adj) 1.5v v in -v out 8v 1.225 1.25 1.275 v output voltage LD1083-15 LD1083-18 LD1083-25 LD1083-33 LD1083-50 1.470 1.764 2.450 3.235 4.90 1.50 1.80 2.50 3.30 5.00 1.530 1.836 2.550 3.365 5.10 v line regulation 1.5v v in -v out 10v 0.02 0.5 % load regulation 10ma < i o < 7.5a 1 % dropout voltage i out =7.5a, v out = 1%v out 1.3 1.5 v current limit v in -v out =3v 5.1 a adjusted pin current i o =10ma~7.5a 1.5v v in -v out 10v 60 120 ua adjusted pin current change( i adj ) i o =10ma~7.5a 1.5v v in -v out 10v 0.2 5 ua temperature stability i o =10ma 0.5 % minimum load current 1.5v v in -v out 10v 5 10 ma rms output noise (% of v out ) 10hz f 10khz 0.003 % ripple rejection ratio 120hz input ripple c out =25uf (v in -v out )=3v 60 72 db typical performance characteristics LD1083 4 of 9 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
load transient response line transient response LD1083 5 of 9 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
package information LD1083 6 of 9 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
LD1083 7 of 9 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
LD1083 8 of 9 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
LD1083 9 of 9 4008-318-123 sales@twtysemi.com http://www.twtysemi.com product specification
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