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? semiconductor components industries, llc, 2004 january, 2004 ? rev. 16 1 publication order number: ncp500/d ncp500 150 ma cmos low noise low-dropout voltage regulator the ncp500 series of fixed output low dropout linear regulators are designed for portable battery powered applications which require low noise operation, fast enable response time, and low dropout. the device achieves its low noise performance without the need of an external noise bypass capacitor. each device contains a voltage reference unit, an error amplifier, a pmos power transistor, and resistors for setting output voltage, and current limit and temperature limit protection circuits. the ncp500 has been designed to be used with low cost ceramic capacitors and requires a minimum output capacitor of 1.0 f. features ? ultra?low dropout voltage of 170 mv at 150 ma ? fast enable turn?on time of 20 sec ? wide operating voltage range of 1.8 v to 6.0 v ? excellent line and load regulation ? high accuracy output voltage of 2.5% ? enable can be driven directly by 1.0 v logic ? typical rms noise voltage 50 v with no bypass capacitor (bw = 10 hz to 100 khz) ? very small qfn 2x2 package ? pb?free package may be available.* the g?suffix denotes a pb?free lead finish typical applications ? noise sensitive circuits ? vco's, rf stages, etc. ? smps post?regulation ? hand?held instrumentation ? camcorders and cameras driver w/ current limit v in v out thermal shutdown enable gnd off on 1 (3) 3 (1) 5 (4) 2 (2, 5) figure 1. simplified block diagram note: pin numbers in parenthesis indicate qfn package. see detailed ordering and shipping information in the package dimensions section on page 17 of this data sheet. ordering information tsop?5 sn suffix case 483 1 5 pin connections and marking diagrams 1 3 n/c v in 2 gnd enable 4 v out 5 xxxyw xxx, xx = version y = year w = work week m = date code (top view) tsop?5 1 6 qfn 2x2 sql suffix case 488 1 3 n/c v in 2 gnd enable 4 v out 5 6 gnd qfn 2x2 (top view) http://onsemi.com xxm *for additional information on our pb?free strategy and soldering details, please download the on semiconductor soldering and mounting t echniques reference manual, solderrm/d.
ncp500 http://onsemi.com 2 pin function description tsop?5 pin no. qfn 2x2 pin no. pin name description 1 3 v in positive power supply input voltage. 2 2, 5 gnd power supply ground. 3 1 enable this input is used to place the device into low-power standby. when this input is pulled to a logic low, the device is disabled. if this function is not used, enable should be connected to v in . 4 6 n/c no internal connection. 5 4 v out regulated output voltage. maximum ratings rating symbol value unit input voltage v in 0 to 6.0 v enable voltage v on/off -0.3 to v in +0.3 v output voltage v out -0.3 to v in +0.3 v output short circuit duration - infinite - thermal resistance, junction-to-ambient tsop-5 qfn (note 3) r ja 250 225 c/w operating junction temperature t j +125 c storage temperature t stg -65 to +150 c 1. this device series contains esd protection and exceeds the following tests: human body model 2000 v per mil?std?883, method 3015 machine model method 200 v latch up capability (85 c) 100 ma. 2. device is internally limited to 160 c by thermal shutdown. 3. for more information, refer to application note, and8080/d. electrical characteristics (v in = 2.35 v, c in = 1.0 f, c out = 1.0 f, for typical value t a = 25 c, for min and max values t a = ?40 c to 85 c, t jmax = 125 c, unless otherwise noted) characteristic symbol min typ max unit ?1.8 v output voltage (t a = ?40 c to 85 c, i out = 1.0 ma to 150 ma) v out 1.755 1.8 1.845 v line regulation (v in = 2.3 v to 6.0 v, i out = 1.0 ma) reg line ? 1.0 10 mv load regulation (i out = 1.0 ma to 150 ma) reg load ? 15 45 mv dropout voltage (measured at v out ? 2.0%, t a = ?40 c to 85 c) (iout = 1.0 ma) (iout = 75 ma) (iout = 150 ma) v in ? v out ? ? ? 2.0 140 270 10 200 350 mv output short circuit current i out(max) 200 540 700 ma ripple rejection (v in = v out (nom.) + 1.0 v + 0.5 v pp , f = 1.0 khz, i o = 60 ma) rr ? 62 ? db quiescent current (enable input = 0 v) (enable input = 0.9 v, i out = 1.0 ma) (enable input = 0.9 v, i out = 150 ma) i q ? ? ? 0.01 175 175 1.0 300 300 a enable input threshold voltage (voltage increasing, output turns on, logic high) (voltage decreasing, output turns off, logic low) v th(en) 0.9 ? ? ? ? 0.15 v enable input bias current i ib(en) ? 3.0 100 na output turn on time (enable input = 0 v to v in ) ? ? 20 100 s
ncp500 http://onsemi.com 3 electrical characteristics (continued) (v in = 2.35 v, c in = 1.0 f, c out = 1.0 f, for typical value t a = 25 c, for min and max values t a = ?40 c to 85 c, t jmax = 125 c, unless otherwise noted) characteristic symbol min typ max unit ?1.85 v output voltage (t a = ?40 c to 85 c, i out = 1.0 ma to 150 ma) v out 1.804 1.85 1.896 v line regulation (v in = 2.3 v to 6.0 v, i out = 1.0 ma) reg line ? 1.0 10 mv load regulation (i out = 1.0 ma to 150 ma) reg load ? 15 45 mv dropout voltage (measured at v out ? 2.0%, t a = ?40 c to 85 c) (iout = 1.0 ma) (iout = 75 ma) (iout = 150 ma) v in ? v out ? ? ? 2.0 ? ? 10 ? ? mv output short circuit current i out(max) 200 540 700 ma ripple rejection (v in = v out (nom.) + 1.0 v + 0.5 v pp , f = 1.0 khz, i o = 60 ma) rr ? 62 ? db quiescent current (enable input = 0 v) (enable input = 0.9 v, i out = 1.0 ma) (enable input = 0.9 v, i out = 150 ma) i q ? ? ? 0.01 175 175 1.0 300 300 a enable input threshold voltage (voltage increasing, output turns on, logic high) (voltage decreasing, output turns off, logic low) v th(en) 0.9 ? ? ? ? 0.15 v enable input bias current i ib(en) ? 3.0 100 na output turn on time (enable input = 0 v to v in ) ? ? 20 100 s electrical characteristics (continued) (v in = 3.0 v, c in = 1.0 f, c out = 1.0 f, for typical value t a = 25 c, for min and max values t a = ?40 c to 85 c, t jmax = 125 c, unless otherwise noted) characteristic symbol min typ max unit ?2.5 v output voltage (t a =?40 c to 85 c, i out = 1.0 ma to 150 ma) v out 2.438 2.5 2.563 v line regulation (v in = 3.0 v to 6.0 v, i out = 1.0 ma) reg line ? 1.0 10 mv load regulation (i out = 1.0 ma to 150 ma) reg load ? 15 45 mv dropout voltage (measured at v out ? 2.0%, t a = ?40 c to 85 c) (iout = 1.0 ma) (iout = 75 ma) (iout = 150 ma) v in ? v out ? ? ? 2.0 100 190 10 170 270 mv output short circuit current i out(max) 200 540 700 ma ripple rejection (v in = v out (nom.) + 1.0 v + 0.5 v pp , f = 1.0 khz, i o = 60 ma) rr ? 62 ? db quiescent current (enable input = 0 v) (enable input = 0.9 v, i out = 1.0 ma) (enable input = 0.9 v, i out = 150 ma) i q ? ? ? 0.01 180 180 1.0 300 300 a enable input threshold voltage (voltage increasing, output turns on, logic high) (voltage decreasing, output turns off, logic low) v th(en) 0.9 ? ? ? ? 0.15 v enable input bias current i ib(en) ? 3.0 100 na output turn on time (enable input = 0 v to v in ) ? ? 20 100 s
ncp500 http://onsemi.com 4 electrical characteristics (v in = 3.1 v, c in = 1.0 f, c out = 1.0 f, for typical value t a = 25 c, for min and max values t a = ?40 c to 85 c, t jmax = 125 c, unless otherwise noted) characteristic symbol min typ max unit ?2.6 v output voltage (t a =?40 c to 85 c, i out = 1.0 ma to 150 ma) v out 2.535 2.6 2.665 v line regulation (v in = 3.0 v to 6.0 v, i out = 1.0 ma) reg line ? 1.0 10 mv load regulation (i out = 1.0 ma to 150 ma) reg load ? 15 45 mv dropout voltage (measured at v out ? 2.0%, t a = ?40 c to 85 c) (iout = 1.0 ma) (iout = 75 ma) (iout = 150 ma) v in ? v out ? ? ? 2.0 ? ? 10 ? ? mv output short circuit current i out(max) 200 540 700 ma ripple rejection (v in = v out (nom.) + 1.0 v + 0.5 v pp , f = 1.0 khz, i o = 60 ma) rr ? 62 ? db quiescent current (enable input = 0 v) (enable input = 0.9 v, i out = 1.0 ma) (enable input = 0.9 v, i out = 150 ma) i q ? ? ? 0.01 180 180 1.0 300 300 a enable input threshold voltage (voltage increasing, output turns on, logic high) (voltage decreasing, output turns off, logic low) v th(en) 0.9 ? ? ? ? 0.15 v enable input bias current i ib(en) ? 3.0 100 na output turn on time (enable input = 0 v to v in ) ? ? 20 100 s electrical characteristics (v in = 3.2 v, c in = 1.0 f, c out = 1.0 f, for typical value t a = 25 c, for min and max values t a = ?40 c to 85 c, t jmax = 125 c, unless otherwise noted) characteristic symbol min typ max unit ?2.7 v output voltage (t a =?40 c to 85 c, i out = 1.0 ma to 150 ma) v out 2.633 2.7 2.768 v line regulation (v in = 3.2 v to 6.0 v, i out = 1.0 ma) reg line ? 1.0 10 mv load regulation (i out = 1.0 ma to 150 ma) reg load ? 15 45 mv dropout voltage (measured at v out ? 2.0%, t a = ?40 c to 85 c) (iout = 1.0 ma) (iout = 75 ma) (iout = 150 ma) v in ? v out ? ? ? 2.0 90 180 10 160 260 mv output short circuit current i out(max) 200 540 700 ma ripple rejection (v in = v out (nom.) + 1.0 v + 0.5 v pp , f = 1.0 khz, i o = 60 ma) rr ? 62 ? db quiescent current (enable input = 0 v) (enable input = 0.9 v, i out = 1.0 ma) (enable input = 0.9 v, i out = 150 ma) i q ? ? ? 0.01 185 185 1.0 300 300 a enable input threshold voltage (voltage increasing, output turns on, logic high) (voltage decreasing, output turns off, logic low) v th(en) 0.9 ? ? ? ? 0.15 v enable input bias current i ib(en) ? 3.0 100 na output turn on time (enable input = 0 v to v in ) ? ? 20 100 s
ncp500 http://onsemi.com 5 electrical characteristics (v in = 3.3 v, c in = 1.0 f, c out = 1.0 f, for typical value t a = 25 c, for min and max values t a = ?40 c to 85 c, t jmax = 125 c, unless otherwise noted) characteristic symbol min typ max unit ?2.8 v output voltage (t a =?40 c to 85 c, i out = 1.0 ma to 150 ma) v out 2.730 2.8 2.870 v line regulation (v in = 3.3 v to 6.0 v, i out = 1.0 ma) reg line ? 1.0 10 mv load regulation (i out = 1.0 ma to 150 ma) reg load ? 15 45 mv dropout voltage (measured at v out ? 2.0%, t a = ?40 c to 85 c) (iout = 1.0 ma) (iout = 75 ma) (iout = 150 ma) v in ? v out ? ? ? 2.0 90 170 10 150 250 mv output short circuit current i out(max) 200 540 700 ma ripple rejection (v in = v out (nom.) + 1.0 v + 0.5 v pp , f = 1.0 khz, i o = 60 ma) rr ? 62 ? db quiescent current (enable input = 0 v) (enable input = 0.9 v, i out = 1.0 ma) (enable input = 0.9 v, i out = 150 ma) i q ? ? ? 0.01 185 185 1.0 300 300 a enable input threshold voltage (voltage increasing, output turns on, logic high) (voltage decreasing, output turns off, logic low) v th(en) 0.9 ? ? ? ? 0.15 v enable input bias current i ib(en) ? 3.0 100 na output turn on time (enable input = 0 v to v in ) ? ? 20 100 s electrical characteristics (v in = 3.5 v, c in = 1.0 f, c out = 1.0 f, for typical value t a = 25 c, for min and max values t a = ?40 c to 85 c, t jmax = 125 c, unless otherwise noted) characteristic symbol min typ max unit ?3.0 v output voltage (t a =?40 c to 85 c, i out = 1.0 ma to 150 ma) v out 2.925 3.0 3.075 v line regulation (v in = 3.5 v to 6.0 v, i out = 1.0 ma) reg line ? 1.0 10 mv load regulation (i out = 1.0 ma to 150 ma) reg load ? 15 45 mv dropout voltage (measured at v out ? 2.0%, t a = ?40 c to 85 c) (iout = 1.0 ma) (iout = 75 ma) (iout = 150 ma) v in ? v out ? ? ? 2.0 85 165 10 130 240 mv output short circuit current i out(max) 200 540 700 ma ripple rejection (v in = v out (nom.) + 1.0 v + 0.5 v pp , f = 1.0 khz, i o = 60 ma) rr ? 62 ? db quiescent current (enable input = 0 v) (enable input = 0.9 v, i out = 1.0 ma) (enable input = 0.9 v, i out = 150 ma) i q ? ? ? 0.01 190 190 1.0 300 300 a enable input threshold voltage (voltage increasing, output turns on, logic high) (voltage decreasing, output turns off, logic low) v th(en) 0.9 ? ? ? ? 0.15 v enable input bias current i ib(en) ? 3.0 100 na output turn on time (enable input = 0 v to v in ) ? ? 20 100 s
ncp500 http://onsemi.com 6 electrical characteristics (v in = 3.8 v, c in = 1.0 f, c out = 1.0 f, for typical value t a = 25 c, for min and max values t a = ?40 c to 85 c, t jmax = 125 c, unless otherwise noted) characteristic symbol min typ max unit ?3.3 v output voltage (t a =?40 c to 85 c, i out = 1.0 ma to 150 ma) v out 3.218 3.3 3.383 v line regulation (v in = 3.8 v to 6.0 v, i out = 1.0 ma) reg line ? 1.0 10 mv load regulation (i out = 1.0 ma to 150 ma) reg load ? 15 45 mv dropout voltage (measured at v out ? 2.0%, t a = ?40 c to 85 c) (iout = 1.0 ma) (iout = 75 ma) (iout = 150 ma) v in ? v out ? ? ? 2.0 80 150 10 110 230 mv output short circuit current i out(max) 200 540 700 ma ripple rejection (v in = v out (nom.) + 1.0 v + 0.5 v pp , f = 1.0 khz, i o = 60 ma) rr ? 62 ? db quiescent current (enable input = 0 v) (enable input = 0.9 v, i out = 1.0 ma) (enable input = 0.9 v, i out = 150 ma) i q ? ? ? 0.01 195 195 1.0 300 300 a enable input threshold voltage (voltage increasing, output turns on, logic high) (voltage decreasing, output turns off, logic low) v th(en) 0.9 ? ? ? ? 0.15 v enable input bias current i ib(en) ? 3.0 100 na output turn on time (enable input = 0 v to v in ) ? ? 20 100 s
ncp500 http://onsemi.com 7 electrical characteristics (v in = 5.5 v, c in = 1.0 f, c out = 1.0 f, for typical value t a = 25 c, for min and max values t a = ?40 c to 85 c, t jmax = 125 c, unless otherwise noted) characteristic symbol min typ max unit ?5.0 v output voltage (t a =?40 c to 85 c, i out = 1.0 ma to 150 ma) v out 4.875 5.0 5.125 v line regulation (v in = 5.5 v to 6.0 v, i out = 1.0 ma) reg line ? 1.0 10 mv load regulation (i out = 1.0 ma to 150 ma) reg load ? 15 45 mv dropout voltage (measured at v out ? 2.0%, t a = ?40 c to 85 c) (iout = 1.0 ma) (iout = 75 ma) (iout = 150 ma) v in ? v out ? ? ? 2.0 60 120 10 100 180 mv output short circuit current i out(max) 200 540 700 ma ripple rejection (v in = v out (nom.) + 1.0 v + 0.5 v pp , f = 1.0 khz, i o = 60 ma) rr ? 62 ? db quiescent current (enable input = 0 v) (enable input = 0.9 v, i out = 1.0 ma) (enable input = 0.9 v, i out = 150 ma) i q ? ? ? 0.01 210 210 1.0 300 300 a enable input threshold voltage (voltage increasing, output turns on, logic high) (voltage decreasing, output turns off, logic low) v th(en) 0.9 ? ? ? ? 0.15 v enable input bias current i ib(en) ? 3.0 100 na output turn on time (enable input = 0 v to v in ) ? ? 20 100 s 4. maximum package power dissipation limits must be observed. pd t j(max) t a r ja 5. low duty cycle pulse techniques are used during testing to maintain the junction temperature as close to ambient as possible.
ncp500 http://onsemi.com 8 230 190 250 170 210 150 270 290 310 330 350 160 ?50 30 60 50 20 50 75 25 0 100 temperature ( c) v in ? v out, dropout voltage (mv) 10 40 0 ?25 temperature ( c) figure 2. dropout voltage vs. temperature figure 3. dropout voltage vs. temperature v in ? v out, dropout voltage (mv) ?50 80 70 60 50 50 25 0 40 30 20 10 0 ?25 75 100 125 figure 4. dropout voltage vs. temperature temperature ( c) figure 5. dropout voltage vs. temperature temperature ( c) v in ? v out, dropout voltage (mv) v in ? v out, dropout voltage (mv) figure 6. dropout voltage vs. temperature temperature ( c) figure 7. dropout voltage vs. temperature temperature ( c) v in ? v out, dropout voltage (mv) v in ? v out, dropout voltage (mv) v out(nom.) = 3.3 v 70 125 ?50 120 100 60 80 50 25 0 40 20 0 ?25 75 100 125 ?50 50 75 25 0 100 ?25 125 160 120 180 100 140 80 200 ?50 50 75 25 0 100 ?25 125 120 180 100 140 80 200 220 ?50 50 75 25 0 100 ?25 125 v out(nom.) = 2.8 v v out(nom.) = 1.8 v v out(nom.) = 3.3 v v out(nom.) = 2.8 v v out(nom.) = 1.8 v 50 ma load 10 ma load 1.0 ma load 150 ma load 120 ma load 100 ma load 150 ma load 120 ma load 100 ma load 150 ma load 120 ma load 100 ma load 50 ma load 10 ma load 1.0 ma load 50 ma load 10 ma load 1.0 ma load
ncp500 http://onsemi.com 9 25 2.804 2.802 2.8 2.798 2.796 2.794 2.792 2.790 1.804 1.8035 1.803 1.8025 1.802 1.8015 1.801 1.8005 225 200 175 150 125 100 75 50 0 25 210 200 190 180 170 160 150 ?50 3.308 3.306 50 3.304 3.302 75 25 0 100 temperature ( c) v out, output voltage (v) 3.300 3.298 3.296 3.294 3.292 ?25 temperature ( c) figure 8. output voltage vs. temperature figure 9. output voltage vs. temperature v out, output voltage (v) figure 10. output voltage vs. temperature temperature ( c) figure 11. quiescent current vs. temperature temperature ( c) i q, quiescent current ( a) v out, output voltage (v) figure 12. quiescent current vs. input voltage input voltage (v) figure 13. quiescent current vs. input voltage input voltage (v) i q, quiescent current ( a) i q, quiescent current ( a) v out(nom.) = 1.8 v i out = 0 ma t a = 25 c 125 ?50 50 75 25 0 100 ?25 12 5 ?50 50 75 25 0 100 ?25 125 ?50 50 75 25 0 100 ?25 125 0 225 200 4.0 175 150 5.0 3.0 2.0 6.0 125 100 75 50 1.0 0 v out(nom.) = 3.3 v i out = 0 ma t a = 25 c v in = v out(nom.) +0.5 v v out(nom.) = 3.3 v i o = 1.0 ma 0 4.0 5.0 3.0 2.0 6.0 1.0 v in = v out(nom.) = + 0.5 v i o = 0 ma v out(nom.) = 3.3 v v out(nom.) = 1.8 v v in = v out(nom.) + 0.5 v v out(nom.) = 2.8 v i o = 1.0 ma v in = v out(nom.) + 0.5 v v out(nom.) = 1.8 v i o = 1.0 ma
ncp500 http://onsemi.com 10 150 125 100 75 50 25 0 175 200 225 40 20 0 60 80 100 600 400 200 0 800 1000 400 300 200 100 0 500 600 150 125 100 75 50 25 0 175 200 225 input voltage (v) ground pin current ( a) input voltage (v) figure 14. ground pin current vs. input voltage figure 15. ground pin current vs. input voltage ground pin current ( a) figure 16. current limit vs. input voltage input voltage (v) figure 17. ripple rejection vs. frequency f, frequency (khz) rr, ripple rejection (db) current limit (ma) 10 ma figure 18. output noise density f, frequency (khz) figure 19. line transient response time ( s) v out, output voltage noise (nv/ hz ) v out(nom.) = 1.8 v i out = 50 ma t a = 25 c 0 4.0 5.0 3.0 2.0 6.0 1.0 0 4.0 5.0 3.0 2.0 6.0 1.0 0 4.0 5.0 3.0 2.0 6.0 1.0 100 10 0.1 1.0 0.01 100 1000 10 1.0 0.1 100 0 ?50 60 40 020 150 3.0 5.0 100 80 120 140 160 4.0 200 50 v out = 1.8 v v in = 2.8 v i out = 1 ma c out = 1 f v out(nom.) = 3.3 v i out = 50 ma t a = 25 c 60 ma 10 ma v out = 1.8 v v in = 2.8 v dc + 0.5 v p?p c out = 1 f output voltage deviation (mv) v in, input voltage (v) v in = 3.8 v to 4.8 v v out = 3.3 v c out = 1.0 f i out = 1.0 ma v out(nom.) = 3.3 v
ncp500 http://onsemi.com 11 75 0 200 100 0 150 225 ?100 ?200 ?300 3.0 200 150 100 50 4.0 5.0 0 ?50 75 0 50 25 150 225 0 ?25 ?50 time ( s) time ( s) figure 20. line transient response figure 21. load transient response figure 22. load transient response time ( s) figure 23. turn?off response time (ms) 0 80 100 60 40 120 20 140 160 0 40 50 30 20 60 10 04050 30 20 60 10 70 80 90 1.0 0 4.0 3.0 040 20 60 2.0 3.0 2.0 1.0 0 120 80 100 output voltage (v) enable voltage (v) output voltage deviation (mv) i out, output current (ma) output voltage deviation (mv) v in, input voltage (v) output voltage deviation (mv) i out, output current (ma) c out = 1.0 f c out = 10 f v in = 3.8 v to 4.8 v v out = 3.3 v c out = 1.0 f i out = 10 ma v in = 3.8 v v out = 3.3 v c out = 1.0 f c in = 1 f v in = 3.8 v v out = 3.3 v c out = 10 f c in = 1 f v in = 3.8 v v out = 3.3 v t a = 25 c r l = 3.3 k c in = 1 f
ncp500 http://onsemi.com 12 2 1 2.5 0.5 1.5 0 3 0 1.2 1.8 4 1 1.6 5 3 26 v in, input voltage (v) v out, output voltage (v) 0.8 1.4 0.6 1 v in, input voltage (v) v out, output voltage (v) 0 3.5 3 2.5 2 4 3 2 1.5 1 0.5 0 1567 v in, input voltage (v) v out, output voltage (v) c in = 1 f c out = 1 f t a = 25 c v enable = v in 2 045 3 26 1 0.4 0.2 0 c in = 1 f c out = 1 f t a = 25 c v enable = v in c in = 1 f c out = 1 f t a = 25 c v enable = v in figure 24. output voltage vs. input voltage figure 25. output voltage vs. input voltage figure 26. output voltage vs. input voltage
ncp500 http://onsemi.com 13 definitions load regulation the change in output voltage for a change in output load current at a constant temperature. dropout voltage the input/output differential at which the regulator output no longer maintains regulation against further reductions in input voltage. measured when the output drops 2% below its nominal. the junction temperature, load current, and minimum input supply requirements affect the dropout level. output noise voltage this is the integrated value of the output noise over a specified frequency range. input voltage and output load current are kept constant during the measurement. results are expressed in vrms or nv hz . quiescent current the current which flows through the ground pin when the regulator operates without a load on its output: internal ic operation, bias, etc. when the ldo becomes loaded, this term is called the ground current. it is actually the dif ference between the input current (measured through the ldo input pin) and the output current. line regulation the change in output voltage for a change in input voltage. the measurement is made under conditions of low dissipation or by using pulse technique such that the average chip temperature is not significantly affected. line transient response typical over and undershoot response when input voltage is excited with a given slope. thermal protection internal thermal shutdown circuitry is provided to protect the integrated circuit in the event that the maximum junction temperature is exceeded. when activated at typically 160 c, the regulator turns off. this feature is provided to prevent failures from accidental overheating. maximum package power dissipation the power dissipation level at which the junction temperature reaches its maximum operating value, i.e. 125 c.
ncp500 http://onsemi.com 14 applications information the ncp500 series regulators are protected with internal thermal shutdown and internal current limit. a typical application circuit is shown in figure 27. input decoupling (c1) a 1.0 f capacitor either ceramic or tantalum is recommended and should be connected close to the ncp500 package. higher values and lower esr will improve the overall line transient response. output decoupling (c2) the ncp500 is a stable component and does not require a minimum equivalent series resistance (esr) or a minimum output current. the minimum decoupling value is 1.0 f and can be augmented to fulfill stringent load transient requirements. the regulator accepts ceramic chip capacitors as well as tantalum devices. larger values improve noise rejection and load regulation transient response. figure 29 shows the stability region for a range of operating conditions and esr values. noise decoupling the ncp500 is a low noise regulator without the need of an external bypass capacitor. it typically reaches a noise level of 50 vrms overall noise between 10 hz and 100 khz. the classical bypass capacitor impacts the start up phase of standard ldos. however, thanks to its low noise architecture, the ncp500 operates without a bypass element and thus offers a typical 20 s start up phase. enable operation the enable pin will turn on or off the regulator. these limits of threshold are covered in the electrical specification section of this data sheet. the turn?on/turn?off transient voltage being supplied to the enable pin should exceed a slew rate of 10 mv/ s to ensure correct operation. if the enable is not to be used then the pin should be connected to v in . thermal as power across the ncp500 increases, it might become necessary to provide some thermal relief. the maximum power dissipation supported by the device is dependent upon board design and layout. mounting pad configuration on the pcb, the board material, and the ambient temperature effect the rate of junction temperature rise for the part. this is stating that when the ncp500 has good thermal conductivity through the pcb, the junction temperature will be relatively low with high power dissipation applications. the maximum dissipation the package can handle is given by: pd t j(max) t a r ja if t j is not recommended to exceed 125 c, then the ncp500 can dissipate up to 400 mw @ 25 c. the power dissipated by the ncp500 can be calculated from the following equation: p tot [ v in *i gnd (i out ) ] [ v in v out ] *i out or v inmax p tot v out * i out i gnd i out if a 150 ma output current is needed the ground current is extracted from the data sheet curves: 200 a @ 150 ma. for a ncp500sn18t1 (1.8 v), the maximum input voltage will then be 4.4 v, good for a 1 cell li?ion battery. hints please be sure the v in and gnd lines are suf ficiently wide. when the impedance of these lines is high, there is a chance to pick up noise or cause the regulator to malfunction. set external components, especially the output capacitor, as close as possible to the circuit, and make leads as short as possible. package placement qfn packages can be placed using standard pick and place equipment with an accuracy of 0.05 mm. component pick and place systems are composed of a vision system that recognizes and positions the component and a mechanical system which physically performs the pick and place operation. two commonly used types of vision systems are: (1) a vision system that locates a package silhouette and (2) a vision system that locates individual bumps on the interconnect pattern. the latter type renders more accurate place but tends to be more expensive and time consuming. both methods are acceptable since the parts align due to a self?centering feature of the qfn solder joint during solder re?flow. solder paste type 3 or type 4 solder paste is acceptable. re?flow and cleaning the qfn may be assembled using standard ir/ir convection smt re?flow processes without any special considerations. as with other packages, the thermal profile for specific board locations must be determined. nitrogen purge is recommended during solder for no?clean fluxes. the qfn is qualified for up to three re?flow cycles at 235 c peak (j?std?020). the actual temperature of the qfn is a function of: ? component density ? component location on the board ? size of surrounding components
ncp500 http://onsemi.com 15 figure 27. typical application circuit v out battery or unregulated voltage c1 c2 off on 1 2 3 5 4 + + figure 28. typical application circuit v out battery or unregulated voltage + c1 off on 1 3 2 4 5 6 + c2 output r 1 2 3 5 4 input 1.0 f 1.0 f output 1 2 3 5 4 input 1.0 f 1.0 f q2 q1 r3 r1 r2 the ncp500 series can be current boosted with a pnp transis- tor. resistor r in conjunction with v be of the pnp determines when the pass transistor begins conducting; this circuit is not short circuit proof. input/output differential voltage minimum is increased by v be of the pass resistor. short circuit current limit is essentially set by the v be of q2 and r1. i sc = ((v beq2 ? ib * r2) / r1) + i o(max) regulator q1 0 10 1 75 50 25 0.1 0.01 100 125 150 i o, output current (ma) output capacitor esr ( ) c out = 1 f to 10 f t a = 40 c to 125 c v in = up to 6.0 v unstable stable figure 29. stability figure 30. current boost regulator figure 31. current boost regulator with short circuit limit
ncp500 http://onsemi.com 16 output 1 2 3 5 4 input 1.0 f 1.0 f q1 r 5.6 v a regulated output can be achieved with input voltages that ex- ceed the 6.0 v maximum rating of the ncp500 series with the addition of a simple pre?regulator circuit. care must be taken to prevent q1 from overheating when the regulated output (v out ) is shorted to g nd. output 1 2 3 5 4 input 1.0 f 1.0 f output 1 2 3 5 4 enable 1.0 f 1.0 f c 0 3 3 80 2.5 2 90 40 30 110 time (ms) v out, output voltage (v) 2 1 1.5 20 4 1 0.5 0 100 70 60 50 10 0 enable voltage (v) t a = 25 c v in = 3.4 v v out = 2.8 v r = 1.0 m c = 1.0 f r = 1.0 m c = 0.1 f no delay if a delayed turn?on is needed during power up of several volt- ages then the above schematic can be used. resistor r, and capacitor c, will delay the turn?on of the bottom regulator. a few values were chosen and the resulting delay can be seen in figure 33. the graph shows the delay between the enable signal and output turn?on for various resistor and capacitor values. r figure 32. delayed turn?on figure 33. delayed turn?on figure 34. input voltages greater than 6.0 v
ncp500 http://onsemi.com 17 ordering information device nominal output voltage marking package shipping 2 ncp500sn18t1 ncp500sn185t1 NCP500SN25T1 NCP500SN25T1g ncp500sn26t1 ncp500sn27t1 ncp500sn28t1 ncp500sn28t1g ncp500sn30t1 ncp500sn33t1 ncp500sn33t1g ncp500sn50t1 1.8 1.85 2.5 2.5 2.6 2.7 2.8 2.8 3.0 3.3 3.3 5.0 lcs lfl lct lct lfm lcu lcv lcv lcw lcx lcx lcy tsop?5 3000 units/ 7 tape & reel ncp500sql18t1 ncp500sql25t1 ncp500sql27t1 ncp500sql28t1 ncp500sql30t1 ncp500sql33t1 ncp500sql50t1 1.8 2.5 2.7 2.8 3.0 3.3 5.0 ld le lf lg lh lj lk qfn 2x2 3000 units/ 7 tape & reel for availability of other output voltages, please contact your local on semiconductor sales representative. 2for information on tape and reel specifications, including part orientation and tape sizes, please refer to our tape and reel packaging specifications brochure, brd8011/d.
ncp500 http://onsemi.com 18 package dimensions tsop?5 sn suffix plastic package case 483?02 issue c notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: millimeter. 3. maximum lead thickness includes lead finish thickness. minimum lead thickness is the minimum thickness of base material. 4. a and b dimensions do not include mold flash, protrusions, or gate burrs. dim min max min max inches millimeters a 2.90 3.10 0.1142 0.1220 b 1.30 1.70 0.0512 0.0669 c 0.90 1.10 0.0354 0.0433 d 0.25 0.50 0.0098 0.0197 g 0.85 1.05 0.0335 0.0413 h 0.013 0.100 0.0005 0.0040 j 0.10 0.26 0.0040 0.0102 k 0.20 0.60 0.0079 0.0236 l 1.25 1.55 0.0493 0.0610 m 0 10 0 10 s 2.50 3.00 0.0985 0.1181 0.05 (0.002) 123 54 s a g l b d h c k m j __ _ _ thin sot23?5/tsop?5/sc59?5 0.7 0.028 1.0 0.039 0.95 0.037 2.4 0.094 1.9 0.074 *for additional information on our pb?free strategy and soldering details, please download the on semiconductor soldering and mounting techniques reference manual, solderrm/d. soldering footprint*
ncp500 http://onsemi.com 19 package dimensions qfn 2x2.2 sql suffix plastic package case 488?03 issue c b g l pin 1 u a c side view top view bottom view j h d s dim a min max min max inches 2.18 2.23 0.086 0.088 millimeters b 1.98 2.03 0.078 0.080 c 0.88 0.93 0.035 0.037 d 0.23 0.28 0.009 0.011 g 0.650 bsc 0.026 bsc h 0.35 0.40 0.014 0.016 j 0.05 0.10 0.002 0.004 l 1.28 1.33 0.050 0.052 s 0.33 0.38 0.013 0.015 notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: millimeters. 3. 488-01 obsolete. new standard is 488-02.
ncp500 http://onsemi.com 20 on semiconductor and are registered trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to mak e changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for an y particular purpose, nor does scillc 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. atypicalo parameters which may be provided in scillc data sheets and/or specifications can and do vary in different application s and actual performance may vary over time. all operating parameters, including atypicalso must be validated for each customer application by customer's technical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the scillc product could create a sit uation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its officers, employees, subsidiaries, af filiates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, direct ly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc 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 japan : on semiconductor, japan customer focus center 2?9?1 kamimeguro, meguro?ku, tokyo, japan 153?0051 phone : 81?3?5773?3850 ncp500/d literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 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 : http://onsemi.com order literature : http://www.onsemi.com/litorder for additional information, please contact your local sales representative.

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