3a low dropout positive adjustable regulator new product description the gs1085 is a low dropout three terminal regulator with 3a output current capability. the output voltage is adjustable with the use of a resistor divider. for fixed output v oltage versions, the output v oltage is internally set at 1.8v, 2.5v, or 3.3v. dropout is guaranteed at a maximum of 1.4v at maximum output current. its low dropout voltage and fast transient response make it ideal for low v oltage microprocessor applications. internal current and thermal limiting provides protection against any over load condition that would create excessive junction temperatures. applications ?post regulator for switching supply ?microprocessor power supplies ?constant-current regulators ?motherboard i/o power supplies mechanical data case: t o-220ab, to-263ab (d 2 p ak), to -252 (dpak) high temperature soldering guaranteed: 260?/10 seconds at terminals case outlines are on the back page + + -- for fixed volt age device thermal limit current amp current limit gm v out v in adj gnd v ref 1.25v 55 a functional block diagram features ?dropout voltage 1.3v at 3a output current ?fast transient response ?line regulation typically at 0.015% ?load regulation typically at 0.1% ?internal thermal and current limiting ? adjustable output voltage or fixed 1.8v, 2.5v, 3.3v ?standard 3-pin power packages t o-220ab t o-263ab (d 2 p ak) gs1085ct GS1085CM gs1085ce to- 252 (dpak) 1 2 3 1 2 3 1 2 3 pin definition 1. adjust/gnd. 2. v out (tab) 3. v in gs1085 vishay fo r merly general semiconductor document number 74821 www.vishay.com 24-may-02 1
gs1085 vishay fo r merly general semiconductor www.vishay.com document number 74821 2 24-may-02 maximum ratings and thermal characteristics (t a = 25? unless otherwise noted) p arameter symbol value unit vin pin to adj/gnd pin vin 7 v thermal resistance ?junction to case t o-220ab 3.0 t o-252 r jc 8.0 ?/w t o-263ab 3.0 operating junction temperature range t j 0 to +125 c storage temperature range t stg 65 to 150 ? electrical characteristics (1) t j = 25? (2) , v in = 5v, i o = 10ma unless otherwise noted. p arameter symbol test conditions min typ max unit t j = 25? 1.238 1.250 1.262 reference voltage v ref 0? t j 125? 1.225 1.250 1.275 v 2.65v v in 7v 10ma i o 3a gs1085-1.8 v in = 5v 1.78 1.8 1.82 gs1085-2.5 v in = 5v 2.47 2.5 2.53 output voltage v out gs1085-3.3 v in = 7v 3.26 3.3 3.33 v gs1085 0.98v n v n 1.02v n 0? t j 125? 2.65v v in 5v 10ma i o 3a 2.65v v in 7v line regulation reg line t j = 25? 0.015 0.2 % v o 0? t j 125? 0.035 0.2 10ma i o 3a load regulation reg load t j = 25? 0.1 0.3 % v o 0? t j 125? 0.2 0.4 0? t j 125? dropout voltage v drop i o = 3a 1.3 1.4 v i o = 2a 1.28 1.37 i o = 1a 1.25 1.34 output current i o 0? t j 125? 3.0 4.0 a 2.65 vin 7v adjust pin current i adj 10ma i o 3a 55 120 a 0? t j 125? 2.65 vin 7v adjust pin current change ? i adj 10ma i o 3a 0.2 5 a 0? t j 125? t emperature stability t s i o = 0.5a 0.5 %v o 0? t j 125? minimum load current i lmin 0? t j 125? 5 10 ma adjustable version
document number 74821 www.vishay.com 24-may-02 3 gs1085 vishay fo r merly general semiconductor electrical characteristics (con?.) (1) t j = 25? (2) , v in = 5v, i o = 10ma unless otherwise noted. p arameter symbol test conditions min typ max unit quiescent current i q 0? t j 125? 10 14 ma fixed voltage version rms output noise n 10h z f 10 kh z 0.003 %v o ripple rejection ratio rr f = 120 h z , c o = 25 f 60 68 db c adj = 25 f thermal regulation r th t a = 25?, 30ms pulse 0.02 0.05 %/w long term stability t a = 125?, 1000 hrs 0.3 %v o notes: (1) all parameters, except nominal output voltage are specified for the variable voltage version, allowing a wider v in range. the specified limits also apply for the fixed voltage versions over the allowable input voltage range: gs1085-1.8 (3.2v - 7.0v), gs1085-2.5 (3.9v - 7.0v), gs1085-3.3 (4.75v - 7.0v). (2) to maintain the specified junction temperatures, low duty cycle pulse testing is required for most parameters. notes: v ref = v out ?v adj = 1.25v (typ.) v out = v ref x (1+r2/r1) + i adj x r2 i adj = 55 a (typ.) (1) c1 needed if device is far away from filter capacitors (2) c2 required for stability t ypical application circuit v in 5v v out 3.3v c1 10 f c2 10 f adj v ref 1 32 r1 125 ? 1% r2 205 ? 1% gs1085 adjustable voltage regulator + + v in 5v v out c1 10 f c2 10 f 1 32 gs1085-1.8 gs1085-2.5 gs1085-3.3 fixed voltage regulator + +
gs1085 vishay fo r merly general semiconductor www.vishay.com document number 74821 4 24-may-02 - -0.10 0.10 - -0.05 0.05 0 - -0.15 - -0.20 20 40 60 80 100 120 fig. 2 ?load regulation vs. temperature output voltage deviation (%) t emperature ( c) 0 20 40 60 80 100 - -50 --25 0 25 50 75 100 125 fig. 4 ?adjust pin current adjust pin current ( a) t emperature ( c) 0 - -1.0 -- 0. 7 5 - -0.5 - -0.25 0.25 0.5 0.0 0.75 1.0 - -20 0 20 40 60 80 100 120 140 fig. 5 ?temperature stability output voltage deviation (%) t emperature ( c) i out = 0.5a i out = 3a 0.5 1.0 2 2.5 3.0 1.5 minimum differential voltage (v) output current (a) 1.20 1.18 1.16 1.14 1.12 1.10 1.08 1.06 1.22 0 100 1k 100k 10k 1m fig. 6 ?ripple rejection (with c adj 25 f) ripple rejection (db) frequency (hz) 20 30 40 50 60 70 80 10 12 456 3 fig. 3 ?minimum load current (adjustable version) minimum operating current (ma) input / output differential voltage (v) 2 4 6 8 10 0 t j = 0 c t j = 25 c t j = 125 c fig. 1 ?dropout voltage vs. output current c out = 25 f c out = 25 f c out = 10 f c out = 10 f ratings and characteristic curves (t a = 25? unless otherwise noted)
document number 74821 www.vishay.com 24-may-02 5 gs1085 vishay fo r merly general semiconductor ratings and characteristic curves (t a = 25? unless otherwise noted) - -0.1 1.5a 0.1a - -0.05 0 0.05 0.1 40 80 120 160 200 fig. 7 ?load transient response load current output voltage (v, ac) t ime ( s) 0 v in = 5v c in = 1 f c out = 10 f (tantalum) v out = 3.3v -- 100 7.0 6.0 --5 0 0 50 10 20 30 40 50 fig. 8 ?line transient response input voltage (v) output voltage (mv, ac) t ime ( s) 0 c out = 10 f (tantalum) v out = 3.3v gs1085cxx xxx pa c kage type t: t o-220 m: to-263 e: to-252 output voltage default: adj. 1.8: 1.8v 2.5: 2.5v 3.3: 3.3v ordering information
gs1085 vishay fo r merly general semiconductor www.vishay.com document number 74821 6 24-may-02 9.65 10.29 8.63 9.66 14.60 15.88 1 23 4.06 4.83 1.14 1.40 0.7 (max.) 2.28 2.80 0.50 1.00 1.14 1.40 2.54 (typ.) 1.40 (max.) to- 263 to -252 (dpak) 5.59 5.33 10.42 9.40 5.46 5.21 6.73 6.35 0.58 0.46 2.38 2.19 2.28 (typ.) 0.88 0.64 1 3 2 1.27 1.02 0.51 (min.) dimensions in millimeters 10.66 9.66 6.35 max. 3.42 2.54 4.08 3.54 6.85 5.85 16.51 14.23 14.73 12.70 1.77 1.15 1.01 0.38 2.79 2.29 (with plating) 4.82 3.56 1.39 0.51 1.14 0.31 2.92 2.04 (with plating) t o-220 case outlines
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