?2009 fairchild semiconductor corporation www.fairchildsemi.com rev. 1.0.3 features ? no external components required ? output current in excess of 0.5a ? internal thermal overload ? internal short circuit current limiting ? output transistor safe area compensation ? output voltages of -5v, -6v, -8v, -12v, -15v , -18v and - 24v description the lm79mxx series of 3- terminal medium current negative voltage regulators ar e monolithic integrated circuits designed as fixed voltage regulators. these regulators employ internal current limiting, thermal shutdown and safe area compensation making them essentially indestructible. to-220 1. gnd 2. input 3. output 1 schematic diagram q1 q2 q3 q4 q5 q6 q7 q8 q9 q10 q11 q12 q13 q14 q15 q16 q17 q18 q19 q20 q21 q22 q23 q24 q25 q26 q27 r1 r2 r3 r4 r5 r6 r7 r8 r9 r10 r11 r12 r13 r15 r14 r16 r17 r18 r19 r20 r21 r22 r23 r24 r25 d1 d2 d3 d4 d5 c1 c2 gnd out in lm79mxx 3-terminal 0.5a negative voltage regulator
lm79mxx 2 absolute maximum ratings electrical characteristics (lm79m05) (refer to test circuit, 0 c t j +125 c, l o =350ma, v i = -10v,unless otherwise specified, c i =0.33 f, c o =0.1 f) note: 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. parameter symbol value unit input voltage(for v o = -5v to -18v) (for v o = -24v) v i v i -35 -40 v v thermal resistance junction-cases r jc 5 c/w thermal resistance junction-air r ja 65 c/w operating temperature range t opr 0 ~ +125 c storage temperature range t stg -65 ~ +150 c parameter symbol conditions min. typ. max. unit output voltage v o t j = +25 c -4.8-5-5.2 v i o = 5ma to 350ma v i = -7v to -25v -4.75-5-5.25 line regulation (note1) v o t j =+25 c v i = -7v to -25v - 7.0 50 mv v i = -8v to -25v - 2.0 30 load regulation (note1) v o i o = 5ma to 500ma t j = +25 c -30100mv quiescent current i q t j = +25 c-3.06.0ma quiescent cu rrent change i q i o = 5ma to 350ma - - 0.4 ma i o = 200ma v i = -8v to -25v --0.4 output voltage drift vo/ ti o = 5ma - -0.2 - mv/ c output noise voltage v n f = 10hz, 100khz t a = +25 c -40- v ripple rejection rr f = 120hz v j = -8 to -18v 54 60 - db dropout voltage v d t j =+25 c, i o = 500ma - 1.1 - v short circuit current i sc t j = +25 c, v i = -35v - 140 - ma peak current i pk t j = +25 c - 650 - ma
lm79mxx 3 typical applications figure 1. fixed output regulator figure 2. variable output notes: 1. required for stability. for value give n, capacitor must be solid tantalum. 25 f aluminum electrolytic may be substituted. 2. c 2 improves transient response and ripple re jection. do not increase beyond 50 f. lm79mxx 1.0uf 2.0uf 3 1 2 v i v o lm79mxx v o v i r 2 r 1 c 3 solid tantalum 1uf _ + c 1 2.2uf solid tantalum _ + c 2 25uf _ +
lm79mxx 4 mechanical dimensions package dimensions in millimeters to-220 [ single gauge ]
lm79mxx 7/6/09 0.0m 001 stock#ds903555 ? 2009 fairchild semiconductor corporation life support policy fairchild?s products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain lif e, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. a critical component in an y component of a life support device or system whose fa ilure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com disclaimer fairchild semiconductor reserves the right to make changes with out further notice to any products herein to improve re liability, function or design. fairchild does not assume any liability arising out of the applic ation or use of any product or circuit described herein; neither does it convey any license under its pat ent rights, nor the rights of others. ordering information product number package operating temperature LM79M05CT to-220 0 ~ +125 c
|
