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ka278rxxc-series ? 2 a output lo w dropout voltage regulators ? 2004 fairchild semiconductor corporation www.fairchildsemi.com ka278rxxc-series rev. 1.1.0 1 july 2013 ka278rxxc-series 2 a output low dropout voltage regulators features ka278rxxc-series (33 / 05 / 12) ? 3.3 v, 5 v, 12 v output low-dropout voltage regulator ? to-220 full-mold package (4 pin) ? over-current protection, thermal shutdown ? over-voltage protection, short-circuit protection ? output disable function ka278ra05c ? nominal 5 v output without adjusting ? output adjustable between 1.27 v and 32 v ? 2 a output low-dropout voltage regulator ? to-220 full-mold package (4 pin) ? over-current protection, thermal shutdown ? over-voltage protection, short-circuit protection ordering information part number operating temperature range top mark package packing method ka278r33ctu -20 to 80 c 278r33 to-220f 4l rail ka278r05ctu 278r05 ka278r12ctu 278r12 KA278RA05CTU 278ra05 ka278r12cydtu 278r12 to-220f 4l (forming) description the ka278rxxc is a low-dropout voltage regulator suit- able for various electronic equipment. it provides a con- stant voltage power source in a to-220 4-lead full-mold package. the dropout voltage is below 0.5 v in full-rated current (2 a). this regulator has peak current protection, thermal shutdown, and over-voltage protection. to-220f 4l 1. v in 2. v o 3. gnd 4. v dis - ka278rxxc (33 / 05 / 12) 1 1. v in 2. v o 3. gnd 4. v adj - ka278ra05c
ka278rxxc-series ? 2 a output lo w dropout voltage regulators ? 2004 fairchild semiconductor corporation www.fairchildsemi.com ka278rxxc-series rev. 1.1.0 2 block diagram 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. note: 1. junction-to-case thermal resistance test environments: - pneumatic heat sink fixture; - clamping pressure 60 psi through 12 mm diameter cylinder; - thermal grease applied between pkg and heat sink fixture. figure 1. ka278r33 / 05 / 12c figure 2. ka278ra05c symbol parameter value unit v in input voltage 35 v v dis disable voltage ka278rxxc 35 v i o output current 2.0 a p d 1 power dissipation 1 no heat-sink 1.5 w p d 2 power dissipation 2 with heat-sink 15 w t j junction temperature 150 c t opr operating temperature -20 to 80 c r jc thermal resistance, junction-to case (1) 2.9 c/w r ja thermal resistance, junction-to-air 48.51 c/w thermal shutdown bandgap reference overvoltage protection soa protection shortcircuit protection 1 4 3 2 vin vdis vo gnd high / low output on / off q1 r1 r2 - + - + 1.4v thermal shutdown bandgap reference overvoltage protection soa protection shortcircuit protection 1 4 3 2 vin vadj vo gnd q1 rin rref + -
ka278rxxc-series ? 2 a output lo w dropout voltage regulators ? 2004 fairchild semiconductor corporation www.fairchildsemi.com ka278rxxc-series rev. 1.1.0 3 electrical characteristics v in = note 3, i o = 1.0 a, t a = 25 c, unless otherwise specified. notes: 2. these parameters, although guaranteed, are not 100% tested in production. 3. ka278r33c: v in = 5 v; ka278r05c: v in = 7 v; ka278r12c: v in = 15 v. 4. ka278r33c: v in =4 v to 10 v; ka278r05c: v in = 6 v to 12 v; ka278r12c: v in = 13 v to 29 v. symbol parameter test conditions min. typ. max. unit v o output voltage ka278r33c 3.22 3.30 3.38 v ka278r05c 4.88 5.00 5.12 ka278r12c 11.70 12.00 12.30 r load load regulation 5 ma < i o < 2 a 0.1 2.0 % r line line regulation (4) 0.5 2.5 % rr ripple rejection ratio (2) 45 55 db v drop dropout voltage i o = 2 a 0.5 v v dish disable voltage high ka278 rxxc output active 2.0 v v disl disable voltage low ka278rxxc output disabled 0.8 v i dish disable bias current high ka278rxxc v dis = 2.7 v 20 a i disl disable bias current low ka278rxxc v dis = 0.4 v -0.4 ma i q quiescent current i o = 0 a 10 ma v ref reference voltage ka278ra05c 1.24 1.27 1.30 v
ka278rxxc-series ? 2 a output lo w dropout voltage regulators ? 2004 fairchild semiconductor corporation www.fairchildsemi.com ka278rxxc-series rev. 1.1.0 4 typical performance characteristics (ka278r33c) figure 3. output voltage vs. input voltage figure 4. quiescent current vs. input voltage figure 5. output voltage vs. disable voltage figure 6. output voltage vs. temperature (t j ) figure 7. quiescent current vs. temperature (t j ) figure 8. dropout voltage vs. junction temperature input voltage vin (v) 4.50 3.75 3.00 2.25 1.50 0.75 5.25 0 0 2 4 6 8 10 output voltage vo(v) rl= rl=3.3 8 0 5 10 15 20 0 20 40 60 80 100 rl= quiescent current iq(ma) input voltage vin(v) 0 output voltage vo(v) 3 disable voltage vdis (v) 0.5 1.5 122.5 4.50 3.75 3.00 2.25 1.50 0.75 5.25 0 3.34 3.32 3.30 3.36 -25 output voltage vo(v) temperature tj( o c) 75 125 02550 100 3.26 3.24 3.22 3.28 10 8 6 4 2 0 quiescent current iq(ma) junction temperature tj( o c) 75 125 02550 100 -25 -25 0 25 50 75 100 125 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 2.0a drop out voltage vdrop [v] junction temp tj [ ]
ka278rxxc-series ? 2 a output lo w dropout voltage regulators ? 2004 fairchild semiconductor corporation www.fairchildsemi.com ka278rxxc-series rev. 1.1.0 5 typical performance characteristics (continued) figure 9. power dissipation vs. temperature (t j ) figure 10. over-current protection characteristics (typical value) figure 11. output peak current vs. input-output differential voltage -25 power dissipation p d (w) temperature tj( o c) 75 125 02550 100 15 10 5 20 0 output current(a) relative output voltage(%) 3.0 5.0 01.02.0 4.0 80 60 20 100 0 40 6.0 output current(a) relative output voltage(%) 3.0 5.0 01.02.0 4.0 80 60 20 100 0 40 6.0 relative output voltage(%) 3.0 5.0 01.02.0 4.0 80 60 20 100 0 40 6.0 0123456 3.50 3.75 4.00 4.25 4.50 4.75 output peak current iop (a) input-output differential voltage vin-vo (v)
ka278rxxc-series ? 2 a output lo w dropout voltage regulators ? 2004 fairchild semiconductor corporation www.fairchildsemi.com ka278rxxc-series rev. 1.1.0 6 typical performance characteristics (ka278r05c) figure 12. output voltage vs. input voltage figure 13. quiescent current vs. input voltage figure 14. output voltage vs. disable voltage figure 15. output voltage vs. temperature (t j ) figure 16. quiescent current vs. temperature (t j ) figure 17. dropout voltage vs. junction temperature 51015 input voltage vin (v) 6 5 4 3 2 1 7 0 0 output voltage vo(v) rl= rl=2.5 8 0 5 10 15 20 0 20 40 60 80 100 120 rl= quiescent current iq(ma) input voltage vin(v) 7 6 5 4 3 0 0 output voltage vo(v) 3 disable voltage vdis (v) 0.5 1.5 2 1 122.5 5.04 5.02 5.00 5.06 -25 output voltage vo(v) temperature tj( o c) 75 125 02550 100 4.96 4.94 4.92 4.98 8 6 4 2 0 quiescent current iq(ma) junction temperature tj( o c) 75 125 02550 100 -25 -25 0 25 50 75 100 125 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 2.0a drop out voltage vdrop [v] junction temp tj [ ]
ka278rxxc-series ? 2 a output lo w dropout voltage regulators ? 2004 fairchild semiconductor corporation www.fairchildsemi.com ka278rxxc-series rev. 1.1.0 7 typical performance characteristics (continued) figure 18. power dissipation vs. temperature (t j ) figure 19. over-current protection characteristics (typical value) figure 20. output peak current vs. input-output differential voltage -25 power dissipation p d (w) temperature tj( o c) 75 125 02550 100 15 10 5 20 0 output current(a) relative output voltage(%) 3.0 5.0 01.02.0 4.0 80 60 20 0 40 6.0 output current(a) relative output voltage(%) 3.0 5.0 01.02.0 4.0 80 60 20 0 40 6.0 0123456 3.50 3.75 4.00 4.25 4.50 4.75 output peak current iop (a) input-output differential voltage vin-vo (v)
ka278rxxc-series ? 2 a output lo w dropout voltage regulators ? 2004 fairchild semiconductor corporation www.fairchildsemi.com ka278rxxc-series rev. 1.1.0 8 typical performance characteristics (ka278r12c) figure 21. output voltage vs. input voltage figure 22. quiescent current vs. input voltage figure 23. output voltage vs. disable voltage figure 24. output voltage vs. temperature (t j ) 25. quiescent current vs. temperature (t j ) figure 26. dropout voltage vs. junction temperature 51015 input voltage vin (v) 15.0 12.5 10.0 7.5 5.0 2.5 0 0 output voltage vo(v) rl= rl = 6 20 25 8 0 5 10 15 20 0 20 40 60 80 100 120 rl= quiescent current iq(ma) input voltage vin(v) 0 output voltage vo(v) 3 disable voltage vdis (v) 0.5 1.5 122.5 15.0 12.5 10.0 7.5 5.0 2.5 0 12.04 12.02 12.00 -25 output voltage vo(v) temperature tj( o c) 75 125 02550 100 11.96 11.94 11.92 11.98 10 8 6 4 2 0 quiescent current iq(ma) junction temperature tj( o c) 75 125 02550 100 -25 -25 0 25 50 75 100 125 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 2.0a drop out voltage vdrop [v] junction temp tj [ ]
ka278rxxc-series ? 2 a output lo w dropout voltage regulators ? 2004 fairchild semiconductor corporation www.fairchildsemi.com ka278rxxc-series rev. 1.1.0 9 typical performance characteristics (continued) figure 27. power dissipation vs. temperature (t j ) figure 28. over-current protection characteristics (typical value) figure 29. output peak current vs. input-output differential voltage -25 power dissipation p d (w) temperature tj( o c) 75 125 02550 100 15 10 5 20 0 output current(a) relative output voltage(%) 3.0 5.0 01.02.0 4.0 80 60 20 100 0 40 6.0 output current(a) relative output voltage(%) 3.0 5.0 01.02.0 4.0 80 60 20 100 0 40 6.0 relative output voltage(%) 3.0 5.0 01.02.0 4.0 80 60 20 100 0 40 6.0 0123456 3.50 3.75 4.00 4.25 4.50 4.75 output peak current iop (a) input-output differential voltage vin-vo (v)
ka278rxxc-series ? 2 a output lo w dropout voltage regulators ? 2004 fairchild semiconductor corporation www.fairchildsemi.com ka278rxxc-series rev. 1.1.0 10 typical performance characteristics (ka278ra05c) figure 30. output voltage vs. input voltage figure 31.quiescent current vs. input voltage figure 32. output voltage vs. temperature (t j ) *fixed mode (v o = 5 v) figure 33. quiescent current vs. temperature (t j ) figure 34. dropout voltage vs. junction temperature figure 35. power dissipation vs. temperature (t j ) 51015 input voltage vin (v) 6 5 4 3 2 1 7 0 0 output voltage vo(v) rl= rl=2.5 8 0 5 10 15 20 0 20 40 60 80 100 120 rl= quiescent current iq(ma) input voltage vin(v) 5.04 5.02 5.00 5.06 -25 output voltage vo(v) temperature tj( o c) 75 125 02550 100 4.96 4.94 4.92 4.98 10 8 6 4 2 0 quiescent current iq(ma) junction temperature tj( o c ) 75 125 02550 100 -25 -25 0 25 50 75 100 125 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 2.0a drop out voltage vdrop [v] junction temp tj [ ] -25 power dissipation p d (w) temperature tj( o c) 75 125 02550 100 15 10 5 20 0
ka278rxxc-series ? 2 a output lo w dropout voltage regulators ? 2004 fairchild semiconductor corporation www.fairchildsemi.com ka278rxxc-series rev. 1.1.0 11 typical performance characteristics (continued) figure 36. over-current protection characteristics (typical value) figure 37. output peak current vs. input-output differential voltage output current(a) relative output voltage(%) 3.0 5.0 01.02.0 4.0 80 60 20 100 0 40 6.0 output current(a) relative output voltage(%) 3.0 5.0 01.02.0 4.0 80 60 20 100 0 40 6.0 0123456 3.50 3.75 4.00 4.25 4.50 4.75 output peak current iop (a) input-output differential voltage vin-vo (v)
ka278rxxc-series ? 2 a output lo w dropout voltage regulators ? 2004 fairchild semiconductor corporation www.fairchildsemi.com ka278rxxc-series rev. 1.1.0 12 typical application ka278r33 / 05 / 12c figure 38. application circuit ?c i is required if regulator is located at an appreciable distance from power supply filter. ?c o improves stability and transient response (c o > 47 f). + + 1 2 3 4 vin vdis vo gnd disable signal
ka278rxxc-series ? 2 a output lo w dropout voltage regulators ? 2004 fairchild semiconductor corporation www.fairchildsemi.com ka278rxxc-series rev. 1.1.0 13 typical application (continued) ka278ra05 figure 39. application circuit (adjustable mode) ?c i is required if regulator is located at an appreciable distance from power supply filter. ?c o improves stability and transient response (c o > 47 f). figure 40. internal resistor (r 1 , r 2 ) variation vs. temperature (t j ) figure 41. application circuit (fixed mode) ka278ra05 2 vin 1 3 r3 gnd 4 vo vadj r4 co r l ci output input vo = 1.25 ( 1 + ) r 1 = 1.8k , r 2 = 0.6k r 1 //r 3 r 2 //r 4 ka278ra05 2 vin 1 3 r3 gnd 4 vo vadj r4 co r l ci output input ka278ra05 2 vin 1 3 r3 gnd 4 vo vadj r4 co r l ci output input vo = 1.25 ( 1 + ) r 1 = 1.8k , r 2 = 0.6k r 1 //r 3 r 2 //r 4 vo = 1.25 ( 1 + ) r 1 = 1.8k , r 2 = 0.6k r 1 //r 3 r 2 //r 4 1.27 r 1 = 1.8 k , r 2 = 0.6 k 20 15 10 -50 variation(%) 50 100 125 -25 0 25 75 0 -5 -10 5 junction temperature tj( ? ) 25 20 15 10 -50 variation(%) 50 100 125 -25 0 25 75 50 100 125 -25 0 25 75 0 -5 -10 5 junction temperature tj( ? ) 25 ka278ra05 2 vin 1 3 gnd 4 vo vadj co r l ci output = 5v input ka278ra05 2 vin 1 3 gnd 4 vo vadj co r l ci output = 5v input
ka278rxxc-series ? 2 a output lo w dropout voltage regulators ? 2004 fairchild semiconductor corporation www.fairchildsemi.com ka278rxxc-series rev. 1.1.0 14 physical dimensions figure 42. to220, molded, 4-lead, full-pack, staright lead (active) package drawings are provided as a service to customers considering fairchild components. drawings may change in any manner without notice. please note the revision and/or date on the drawing and contact a fairchild semiconductor representative to ver ify or obtain the most recent revision. package specifications do not expand the terms of fairchild?s worldwide terms and conditions, specifically the warranty therein, which covers fairchild products. always visit fairchild semiconductor?s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/dwg/to/to220c04.pdf . for current tape and reel specifications, visit fairchild semiconductor?s online packaging area: http://www.fairchildsemi.com/packing_dwg/pkg-to220c04.pdf . 4.70 4.30 2.79 2.29 (4x) 3.50 3.30 3.40 3.00 10.20 9.80 7.00 0.70 0.50 (4x) 1.30 max (3x) 1.25 min b 1.50 max 1.05 min (3x) 15.80 15.40 0.89 (3.30 ) b 10.60 10.00 5.00 notes: a. except where noted conforms to sc91a. b does not comply eiaj std. value. c. all dimensions are in millimeters. d. dimensions are exclusive of burrs, mold flash and tie bar protrusions. e. pin 2 connects to dap. f. drawing file name: to220c04rev1 1 1.70 1.30 b 0.60 0.45 3.00 2.60 6.70 6.30 15.90 15.50 b 1.00x 45 13.60 4 to-220f 4l
ka278rxxc-series ? 2 a output lo w dropout voltage regulators ? 2004 fairchild semiconductor corporation www.fairchildsemi.com ka278rxxc-series rev. 1.1.0 15 physical dimensions (continued) figure 43. to220, molded, 4-lead, full-pack, ydtu forming (active) package drawings are provided as a service to customers considering fairchild components. drawings may change in any manner without notice. please note the revision and/or date on the drawing and contact a fairchild semiconductor representative to ver ify or obtain the most recent revision. package specifications do not expand the terms of fairchild?s worldwide terms and conditions, specifically the warranty therein, which covers fairchild products. always visit fairchild semiconductor?s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/dwg/to/to220b04.pdf . for current tape and reel specifications, visit fairchild semiconductor?s online packaging area: http://www.fairchildsemi.com/packing_dwg/pkg-to220b04.pdf . 4.70 4.30 2.79 2.29 3.50 3.30 3.40 3.00 10.20 9.80 7.00 1.30 max (3x) 1.25 min b 1.50 max 1.05 min (3x) 15.80 15.40 0.89 0.70 0.50 (3.30 ) b 5.00 1 3.00 2.60 6.70 6.30 15.90 15.50 b 1.00x 45 26.80 25.20 3.48 2.88 b 1.70 1.30 b 0.60 0.45 5.30 4.70 b 5.60 5.00 b 4 notes: a. except where noted conforms to sc91a. b does not comply eiaj std. value. c. all dimensions are in millimeters. d. dimensions are exclusive of burrs, mold flash and tie bar protrusions. e. pin 2 connects to dap. f. drawing file name: to220b04rev1 to-220f 4l (forming)
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www. onsemi.com 1 on semiconductor and are trademarks of semiconductor components industries, llc dba on semiconductor or its subsidiaries i n the united states and/or other countries. on semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property . a listing of on semiconductor?s product/patent coverage may be accessed at www.onsemi.com/site/pdf/patent ? marking.pdf . on semiconductor reserves the right to make changes without further notice to any products herein. on semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does o n semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including wi thout limitation special, consequential or incidental damages. buyer is responsible for its products and applications using on semiconductor products, including compliance with all laws, reg ulations and safety requirements or standards, regardless of any support or applications information provided by on semiconductor. ?typical? parameters which may be provided in on semiconductor data sheets and/or specifications can and do vary in dif ferent applications and actual performance may vary over time. all operating parameters, including ?typic als? must be validated for each customer application by customer?s technical experts. on semiconductor does not convey any license under its patent rights nor the right s of others. on semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any fda class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. should buyer purchase or use on semicondu ctor products for any such unintended or unauthorized application, buyer shall indemnify and hold on semiconductor and its officers, employees, subsidiaries, affiliates, and distrib utors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that on semiconductor was negligent regarding the design or manufacture of the part. on semiconductor is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws and is not for resale in any manner. publication ordering information n. american technical support : 800 ? 282 ? 9855 toll free usa/canada europe, middle east and africa technical support: phone: 421 33 790 2910 japan customer focus center phone: 81 ? 3 ? 5817 ? 1050 www.onsemi.com literature fulfillment : literature distribution center for on semiconductor 19521 e. 32nd pkwy, aurora, colorado 80011 usa phone : 303 ? 675 ? 2175 or 800 ? 344 ? 3860 toll free usa/canada fax : 303 ? 675 ? 2176 or 800 ? 344 ? 3867 toll free usa/canada email : orderlit@onsemi.com on semiconductor website : www.onsemi.com order literature : http://www.onsemi.com/orderlit for additional information, please contact your local sales representative ? semiconductor components industries, llc

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