www.irf.com 1 10/27/06 three terminal, adjustablenegative voltage regulator om1325sm 1.5a these three terminal negative voltage regulators aresupplied in hermetically sealed packages. all protective features are designed into the circuit, including thermal shutdown, current-limiting, and safe- area control. with heat sinking, these devices can deliver up to 1.5 amps of output current. the unit also features output voltages that can be fixed from -1.2 volts to -37 volts using external resistors. smd-3 product summary:absolute maximum ratings @ tc = 25c features: similar to industry standard lm137a approved to dscc standardized military drawing number 7703406 built-in thermal overload protection short circuit current limiting maximum output voltage tolerence is guaranteed 1% this part is also available in to-257aa package as om1325st (isolated) , to-257aa package as om1325nt (non-isolated), smd-1 package as om1325nm, to-204 package as om1325nk part number standard military drawing number v in adjustable v out package om1325sm 7703406m -4.25v to -41.25v -1.2v to -37v smd-3 parameter symbol value units recommended output voltage range v out -1.2 to -37 recommended input voltage range v in -4.25 to -41.25 output current i out 1.5 a power dissipation p d 20 w input - output volta g e differential v diff 40 v thermal resistance, junction to case r thjc 3.5 c/w operating temperature range t j -55 to +150 stora g e temperature ran g et s -65 to +150 c lead temperature (solderin g 10 seconds) t l 300 v dc pd-97264 downloaded from: http:///
2 www.irf.com om1325sm electrical characteristics: -55c t a 125c, i l = 8.0ma (unless otherwise specified) notes: load and line regulation are specified at a constant junction temperature. pulse testing with low duty cycle is used. changes in output voltage due to heating effects must be taken into account separately. if not tested, shall be guaranteed to the specified limits. denotes the specifications which apply over the full operating temperature range. parameter test conditions symbol min. max. units v diff = 3.0v, t a = 25c -1.262 -1.238 v diff = 3.0v -1.280 -1.220 v diff = 40v -1.280 -1.220 3.0v v diff 40v, t a = 25c -4.5 4.5 3.0v v diff 40v -13.8 13.8 8.0ma i l 1.5a, v diff = 5.0v -25 25 8.0ma i l 1.5a, v diff = 12v , ta = 25c -25 25 8.0ma i l 200ma, v diff = 40v, t a = 25c -25 25 8.0ma i l 100ma, v diff = 40v -50 50 v in = -14.6v, i l = 1.5a p d = 20w, t = 10ms, t a = 25c f = 120hz, v out = v ref c adj = 10 f adjustment pin current v diff = 3.0v -1 0 0 v diff = 40v -1 0 0 3.0v v diff 40v i adj (line) -5.0 5.0 8.0ma i l 1.5a, v diff = 5.0v i adj (load) -5.0 5.0 v diff = 3.0v, v out = -1.4v(forced) - 3.0 v diff = 10v, v out = -1.4v (forced) - 3.0 v diff = 40v, v out = -1.4v (forced) - 5.0 v diff = 5.0v 1.5 3.5 v diff = 40v, t a = 25c 0.24 1.2 v line regulation -5.0 5.0 mv thermal regulation v rth reference voltage v ref r line load regulation r load a ripple rejection r n 66 - i adj adjustment pin current change current limit i lmin minimum load current ma db i cl a downloaded from: http:///
www.irf.com 3 om1325sm standard application * c in is required if regulator is located more than 4 inches from power supply filter. a 1.0 f solid tantalum or 10 f aluminum electrolytic is recommended. ** c o is necessary for stability. a 1.0 f solid tantalum or 10 f aluminum electrolytic is recommended. v out = -1.25v (1+ r2/r1) -v out -v in +v out +v in c in * c o ** + 1.0 f i prog 120 r 1 r 2 + i adg 1.0 f om1325sm downloaded from: http:///
4 www.irf.com om1325sm ir world headquarters: 233 kansas st., el segundo, california 90245, usa tel: (310) 252-7105 ir leominster : 205 crawford st., leominster, massachusetts 01453, usa tel: (978) 534-5776 data and specifications subject to change without notice. 10/2006 case outline and dimensions - smd-3 1. dimensioning and tolerancing per asme y14.5m-19942. controlling dimension: inch 3. dimensions are shown in inches 4. tolerances are 0.010 u.o.s 5. see individual data sheets for pin assignments6. outline used with om part numbers only part numbering nomenclature pin assignments pin 1 - adjust pin 2 - input pin 3 - output case - isolated om 1325 s m m device number isolated / non-isolated s = isolated screening m = mil-prf-38535 package code m = smd-3 notes downloaded from: http:///
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