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ka337 / lm337 ? 3-terminal 1.5 a negative adjustable regulator ? 2011 fairchild semiconductor corporation www.fairchildsemi.com ka337 / lm337 rev. 1.1.1 september 2014 ka337 / lm337 3-terminal 1.5 a negative adjustable regulator features ? output-current in excess of 1.5 a ? output-adjustable between -1.25 v and -37 v ? internal thermal overload protection ? internal short-circuit current limiting ? output-transistor safe area compensation ? floating operation for high-voltage applications ? standard 3-pin to-220 package ordering information block diagram figure 1. block diagram product number package packing method operating temperature KA337TU to-220 (dual gauge) rail 0 c to +125 c lm337t to-220 (single gauge) 1 voltage reference - + 2 protection circuitry 3 output input v adj description the ka337 / lm337 are 3-terminal negative adjustable regulators. they supply in excess of 1.5 a over an output voltage range of -1.25 v to -37 v. these regulators require only two external resistors to set the output volt- age and employ current limiting, thermal overload protec- tion, and safe area compensation. to-220 1. adj 2. input 3. output 1 input
ka337 / lm337 ? 3-terminal 1.5 a negative adjustable regulator ? 2011 fairchild semiconductor corporation www.fairchildsemi.com ka337 / lm337 rev. 1.1.1 2 absolute maximum ratings stresses exceeding the absolute maximum ratings may damage the device. the device may not function or be opera- ble above the recommended operating conditions and stressing the parts to these levels is not recommended. in addi- tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. the absolute maximum ratings are stress ratings only. values are at t a = 25c unless otherwise noted. electrical characteristics v i - v o = 5 v, i o = 40 ma, 0 c t j +125 c, p dmax = 20 w; unless otherwise specified. notes: 1. load and line regulation are specified at constant junction temperature. change in v o due to heating effects must be taken into account separately. pulse testing with low duty is used. 2. c adj , when used, is connected between the adjustment pin and ground. symbol parameter value unit iv i - v o i input-output voltage differential 40 v p d power dissipation internally limited w r jc thermal resistance, junction to case 4 c/w t opr operating temperature range 0 to +125 c t stg storage temperature range -65 to +125 c symbol parameter conditions min. typ. max. unit r line line regulation (1) t a = +25 c, 3 v i v i - v o i 40 v 0.01 0.04 %/ v 3 v i v i - v o i 40 v 0.02 0.07 r load load regulation (1) t a = +25 c, 10 ma i o 0.5 a 15 50 mv 10 ma i o 1.5 a 15 150 i adj adjustable pin current 50 100 a i adj adjustable pin current change t a = +25 c, 10 ma i o 1.5 a, 3 v i v i - v o i 40 v 25 a v ref reference voltage t a =+25 c -1.213 -1.250 -1.287 v 3 v i v i - v o i 40 v, 10 ma i o 1.5 a -1.200 -1.250 -1.300 st t temperature stability 0 c t j +125 c 0.6 % i l(min) minimum load current to maintain regulation 3 v i v i - v o i 40 v 2.5 10.0 ma 3 v i v i - v o i 10 v 1.5 6.0 e n rms noise, % of v out t a =+25 c, 10 hz f 10 khz 0.003 % rr ripple rejection ratio v o = -10 v, f = 120 hz 60 db c adj = 10 f (2) 66 77 st long-term stability t j = 125 c, 1000 hours 0.3 1.0 %
ka337 / lm337 ? 3-terminal 1.5 a negative adjustable regulator ? 2011 fairchild semiconductor corporation www.fairchildsemi.com ka337 / lm337 rev. 1.1.1 3 typical performance characteristics figure 2. line regulation vs. temperature figure 3. load regulations vs. temperature figure 4. adjustable pin current vs. temperature figure 5. adjustable pin current change vs. temperature figure 6. reference voltage vs. temperature figure 7. minimum load current vs. temperature 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 -40 -20 0 20 40 60 80 100 120 v in = -8 v to -45 v i o = 4 ma v out = -5 v datasheet specs at 25 o c [%] min: - typ: 0.01 max: 0.04 t a - temperature[ o c] r line - line regulatoion (%) 0 10 20 30 40 50 -40 -20 0 20 40 60 80 100 120 i o = 10 ma to 0.5 a i o = 10 ma to 1.5 a v in = -6.25 v v out = -1.25 v i o = 10 ma to 1.5 v datasheet specs at 25 o c [%] min: - typ: 15 mv max: 50 mv t a - temperature[ o c] r load - load regulatoion (mv) 0 20 40 60 80 100 -40 -20 0 20 40 60 80 100 120 v i - v o = 5 v i o = 40 ma datasheet specs at 25 o c [%] min: - typ: 50 a max: 100 a t a - temperature[ o c] i adj - adjustable pin current ( a) 0 2 4 6 8 10 -40 -20 0 20 40 60 80 100 120 datsheet specs at 25 o c min: typ: 2 a max: 5 a v i - v o = 3 v to 40 v i o = 10 ma to 1.5 v v i - v o = 3 v to 40 v, i o = 10 ma v i - v o = 3 v to 40 v, i o = 1.5 a v i - v o = 3 v, i o = 10 ma to 1.5 a v i - v o = 40 v, i o = 10 ma to 1.5 a t a - temperature[ o c] i adj - adjustable pin current ( a) 1.20 1.22 1.24 1.26 1.28 1.30 -40 -20 0 20 40 60 80 100 120 datsheet specs at 25 o c min: 1.213 v typ: 1.25 v max: 1.287 v v i - v o = 3 v to 40 v i o = 10 ma to 1.5 v v i - v o = 3 v, i o = 10 ma v i - v o = 3 v, i o = 1.5 a v i - v o = 5 v, i o = 40 ma v i - v o = 40 v, i o = 10 ma v i - v o = 40 v, i o = 1.5 a t a - temperature[ o c] i adj - adjustable pin current ( a) 0 2 4 6 8 10 -40 -20 0 20 40 60 80 100 120 datsheet specs min: typ: 2.5 m a max: 10 m a v i - v o = 3 v to 40 v v = 3 v v i - v o = 10 v v i - v o = 40 v t a - temperature[ o c] i lmin - minimum load current [ m a]
ka337 / lm337 ? 3-terminal 1.5 a negative adjustable regulator ? 2011 fairchild semiconductor corporation www.fairchildsemi.com ka337 / lm337 rev. 1.1.1 4 typical performance characteristics figure 8. noise voltage vs. temperature figure 9. ripple rejection vs. temperature figure 10. short-circuit currents vs. temperature figure 11. peak current vs. temperature 0 10 20 30 40 50 60 70 80 10 100 1000 10 4 -45 -25 0 25 55 85 100 125 e n - noise voltage (uvrms) v i -v o = 5v bandwidth frequency (hz) 50 55 60 65 70 75 80 -40 -20 0 20 40 60 80 100 120 w/o c adj with c adj v out = -10 v c adj = 10 f datasheet specs w/o c adj min: typ: 60 db max: with c adj min: 66 db typ: 77 db max: t a - temperature[ o c] rr - ripple rejection ratio (db) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 -40 -20 0 20 40 60 80 100 120 v i - v o = 40 v v out = gnd test specs at 25 o c [%] min: 0.08 a typ: 0.25 a max: 0.9 a t a - temperature[ o c] i scc - short circuit current (a) 1.5 2.0 2.5 3.0 3.5 -40 -20 0 20 40 60 80 100 120 test specs at 25 o c min: 1.5 a typ: 2.5 a max: 3.5 a v i - v o = 5 v t a - temperature[ o c] i adj - adjustable pin current ( a)
ka337 / lm337 ? 3-terminal 1.5 a negative adjustable regulator ? 2011 fairchild semiconductor corporation www.fairchildsemi.com ka337 / lm337 rev. 1.1.1 5 typical application figure 12. typical application notes: 3. c i is required if regulator is located more then 4 inches from power supply filter. 1.0 f solid tantalum or 10 f aluminum electrolytic is recommended. 4. c o is necessary for stability. 1.0 f solid tantalum or 10 f aluminum electrolytic is recommended. v o = -1.25 v (1 + r 2 / r 1 ). -v o -v i + co (4) 1 f c i (3) r 2 r 1 iadj v i v o + i prog vadj ka337 / lm337 1 f 120
ka337 / lm337 ? 3-terminal 1.5 a negative adjustable regulator ? 2011 fairchild semiconductor corporation www.fairchildsemi.com ka337 / lm337 rev. 1.1.1 6 physical dimensions figure 13. to-220, molded, 3lead, jedec variation ab
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