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? semiconductor components industries, llc, 2014 may, 2014 ? rev. 27 1 publication order number: lp2950/d lp2950, lp2951, ncv2951 100 ma, low power low dropout voltage regulator the lp2950 and lp2951 are micropower voltage regulators that are specifically designed to maintain proper regulation with an extremely low input?to?output voltage differential. these devices feature a very low quiescent bias current of 75 a and are capable of supplying output currents in excess of 100 ma. internal current and thermal limiting protection is provided. the lp2951 has three additional features. the first is the error output that can be used to signal external circuitry of an out of regulation condition, or as a microprocessor power?on reset. the second feature allows the output voltage to be preset to 5.0 v, 3.3 v or 3.0 v output (depending on the version) or programmed from 1.25 v to 29 v. it consists of a pinned out resistor divider along with direct access to the error amplifier feedback input. the third feature is a shutdown input that allows a logic level signal to turn?of f or turn?on the regulator output. due to the low input?to?output voltage differential and bias current specifications, these devices are ideally suited for battery powered computer, consumer, and industrial equipment where an extension of useful battery life is desirable. the lp2950 is available in the three pin case 29 and dpak packages, and the lp2951 is available in the eight pin dual?in?line, soic?8 and micro8 surface mount packages. the ?a? suffix devices feature an initial output voltage tolerance 0.5%. features ? low quiescent bias current of 75 a ? low input?to?output v oltage differential of 50 mv at 100 a and 380 mv at 100 ma ? 5.0 v, 3.3 v or 3.0 v 0.5% allows use as a regulator or reference ? extremely tight line and load regulation ? requires only a 1.0 f output capacitor for stability ? internal current and thermal limiting ? ncv prefix for automotive and other applications requiring unique site and control change requirements; aec?q100 qualified and ppap capable ? these devices are pb?free and rohs compliant lp2951 additional features ? error output signals an out of regulation condition ? output programmable from 1.25 v to 29 v ? logic level shutdown input (see following page for device information.) to?92 case 29 see detailed ordering and shipping information in the package dimensions section on pages 14 and 15 of this data sheet. see general marking information in the device marking section on page 17 of this data sheet. ordering & marking information pin connections pin: 1. output 2. ground 3. input dpak case 369c heatsink surface (shown as terminal 4 in case outline drawing) is connected to pin 2. 12 3 (top view) pin: 1. input 2. ground 3. output 8 1 8 1 8 1 pin connections 18 7 6 5 2 3 4 (top view) output sense shutdown input feedback error output v o ta p gnd soic?8 case 751 pdip?8 case 626 micro8 case 846a http://onsemi.com 1 2 3 4 1 2 3 1 2 bent lead tape & reel ammo pack straight lead bulk pack 3
lp2950, lp2951, ncv2951 http://onsemi.com 2 device information package output voltage operating ambient temperature range 3.0 v 3.3 v 5.0 v adjustable to?92 suffix z lp2950cz?3.0 lp2950acz?3.0 lp2950cz?3.3 lp2950acz?3.3 lp2950cz?5.0 lp2950acz?5.0 not available t a = ?40 to +125 c dpak suffix dt lp2950cdt?3.0 lp2950acdt?3.0 lp2950cdt?3.3 lp2950acdt?3.3 lp2950cdt?5.0 lp2950acdt?5.0 not available t a = ?40 to +125 c soic?8 ? ncv2951acd?3.3r2 ncv2951acdr2 ncv2951cdr2 t a = ?40 to +125 c soic?8 suffix d lp2951cd?3.0 lp2951acd?3.0 lp2951cd?3.3 lp2951acd?3.3 lp2951cd lp2951acd lp2951cd lp2951acd t a = ?40 to +125 c micro8 suffix dm lp2951cdm?3.0 lp2951acdm?3.0 lp2951cdm?3.3 lp2951acdm?3.3 lp2951cdm lp2951acdm lp2951cdm lp2951acdm t a = ?40 to +125 c dip?8 suffix n lp2951cn?3.0 lp2951acn?3.0 lp2951cn?3.3 lp2951acn?3.3 lp2951cn lp2951acn lp2951cn lp2951acn t a = ?40 to +125 c lp2950cx?xx / lp2951cxx?xx 1% output voltage precision at t a = 25 c lp2950acx?xx / lp2951acxx?xx 0.5% output voltage precision at t a = 25 c from cmos/ttl 3 figure 1. representative block diagrams this device contains 34 active transistors. lp2950cz?5.0 battery or unregulated dc gnd 2 output 5.0 v/100 ma 1 input 3 1.23 v reference error amplifier 182 k 60 k 1.0 f gnd 4 182 k 60 k 1.23 v reference 1.0 f lp2951cd or cn error amplifier battery or unregulated dc shutdown error output 5 v o tap feedback 6 7 input 8 output 1 sense 2 5.0 v/100 ma 330 k to cmos/ttl 75 mv/ 60 mv error detection comparator 50 k 60 k
lp2950, lp2951, ncv2951 http://onsemi.com 3 maximum ratings (t a = 25 c, unless otherwise noted.) rating symbol value unit input voltage v cc 30 vdc peak transient input voltage (t < 20 ms) v cc 32 vdc ja 180 c/w thermal resistance, junction?to?case r jc 45 c/w case 369a (dpak) dt suffix (note 1) thermal resistance, junction?to?ambient r ja 92 c/w thermal resistance, junction?to?case r jc 6.0 c/w case 29 (to?226aa/to?92) z suffix thermal resistance, junction?to?ambient r ja 160 c/w thermal resistance, junction?to?case r jc 83 c/w case 626 n suffix thermal resistance, junction?to?ambient r ja 105 c/w case 846a (micro8) dm suffix thermal resistance, junction?to?ambient r ja 240 c/w feedback input voltage v fb ?1.5 to +30 vdc shutdown input voltage v sd ?0.3 to +30 vdc error comparator output voltage v err ?0.3 to +30 vdc operating ambient temperature range t a ?40 to +125 c maximum die junction temperature range t j +150 c storage temperature range t stg ?65 to +150 c stresses exceeding those listed in the maximum ratings table may damage the device. if any of these limits are exceeded, device function ality should not be assumed, damage may occur and reliability may be affected.
lp2950, lp2951, ncv2951 http://onsemi.com 4 electrical characteristics (v in = v o + 1.0 v, i o = 100 a, c o = 1.0 f, t a = 25 c [note 3], unless otherwise noted.) characteristic symbol min typ max unit output voltage, 5.0 v versions v o v v in = 6.0 v, i o = 100 a, t a = 25 c lp2950c?5.0/lp2951c/ncv2951c* 4.950 5.000 5.050 lp2950ac?5.0/lp2951ac/ncv2951ac* 4.975 5.000 5.025 t a = ? 40 to +125 c lp2950c?5.0/lp2951c/ncv2951c* 4.900 ? 5.100 lp2950ac?5.0/lp2951ac/ncv2951ac* 4.940 ? 5.060 v in = 6.0 to 30 v, i o = 100 a to 100 ma, t a = ? 40 to +125 c lp2950c?5.0/lp2951c/ncv2951c* 4.880 ? 5.120 lp2950ac?5.0/lp2951ac/ncv2951ac* 4.925 ? 5.075 output voltage, 3.3 v versions v o v v in = 4.3 v, i o = 100 a, t a = 25 c lp2950c?3.3/lp2951c?3.3 3.267 3.300 3.333 lp2950ac?3.3/lp2951ac?3.3/ncv2951ac?3.3* 3.284 3.300 3.317 t a = ? 40 to +125 c lp2950c?3.3/lp2951c?3.3 3.234 ? 3.366 lp2950ac?3.3/lp2951ac?3.3/ncv2951ac?3.3* 3.260 ? 3.340 v in = 4.3 to 30 v, i o = 100 a to 100 ma, t a = ? 40 to +125 c lp2950c?3.3/lp2951c?3.3 3.221 ? 3.379 lp2950ac?3.3/lp2951ac?3.3/ncv2951ac?3.3* 3.254 ? 3.346 output voltage, 3.0 v versions v o v v in = 4.0 v, i o = 100 a, t a = 25 c lp2950c?3.0/lp2951c?3.0 2.970 3.000 3.030 lp2950ac?3.0/lp2951ac?3.0 2.985 3.000 3.015 t a = ? 40 to +125 c lp2950c?3.0/lp2951c?3.0 2.940 ? 3.060 lp2950ac?3.0/lp2951ac?3.0 2.964 ? 3.036 v in = 4.0 to 30 v, i o = 100 a to 100 ma, t a = ? 40 to +125 c lp2950c?3.0/lp2951c?3.0 2.928 ? 3.072 lp2950ac?3.0/lp2951ac?3.0 2.958 ? 3.042 product parametric performance is indicated in the electrical characteristics for the listed test conditions, unless otherwise noted. product performance may not be indicated by the electrical characteristics if operated under different conditions. 1. the junction?to?ambient thermal resistance is determined by pcb copper area per figure 29. 2. this device series contains esd protection and exceeds the following tests: human body model (hbm), 2000 v, class 2, jesd22 a114?c machine model (mm), 200 v, class b, jesd22 a115?a charged device model (cdm), 2000 v, class iv, jesd22 c101?c 3. low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible. 4. v o(nom) is the part number voltage option. 5. noise tests on the lp2951 are made with a 0.01 f capacitor connected across pins 7 and 1. *ncv prefix is for automotive and other applications requiring site and change control.
lp2950, lp2951, ncv2951 http://onsemi.com 5 electrical characteristics (continued) (v in = v o + 1.0 v, i o = 100 a, c o = 1.0 f, t a = 25 c [note 8], unless otherwise noted.) characteristic symbol min typ max unit line regulation (v in = v o(nom) +1.0 v to 30 v) (note 9) reg line % lp2950c?xx/lp2951c/lp2951c?xx/ncv2951c* ? 0.08 0.20 lp2950ac?xx/lp2951ac/lp2951ac?xx/ncv2951ac* ? 0.04 0.10 load regulation (i o = 100 a to 100 ma) reg load % lp2950c?xx/lp2951c/lp2951c?xx/ncv2951c* ? 0.13 0.20 lp2950ac?xx/lp2951ac/lp2951ac?xx/ncv2951ac* ? 0.05 0.10 dropout voltage v i ? v o mv i o = 100 a ? 30 80 i o = 100 ma ? 350 450 supply bias current i cc i o = 100 a ? 93 120 a i o = 100 ma ? 4.0 12 ma dropout supply bias current (v in = v o(nom) ? 0.5 v, i o = 100 a) (note 9) i ccdropout ? 110 170 a current limit (v o shorted to ground) i limit ? 220 300 ma thermal regulation reg thermal ? 0.05 0.20 %/w output noise voltage (10 hz to 100 khz) (note 10) v n vrms c l = 1.0 f ? 126 ? c l = 100 f ? 56 ? lp2951a/lp2951ac only reference voltage (t a = 25 c) v ref v lp2951c/lp2951c?xx/ncv2951c* 1.210 1.235 1.260 lp2951ac/lp2951ac?xx/ncv2951ac* 1.220 1.235 1.250 reference voltage (t a = ? 40 to +125 c) v ref v lp2951c/lp2951c?xx/ncv2951c* 1.200 ? 1.270 lp2951ac/lp2951ac?xx/ncv2951ac* 1.200 ? 1.260 reference voltage (t a = ? 40 to +125 c) v ref v i o = 100 a to 100 ma, v in = 23 to 30 v lp2951c/lp2951c?xx/ncv2951c* 1.185 ? 1.285 lp2951ac/lp2951ac?xx/ncv2951ac* 1.190 ? 1.270 feedback pin bias current i fb ? 15 40 na error comparator output leakage current (v oh = 30 v) i lkg ? 0.01 1.0 a output low voltage (v in = 4.5 v, i ol = 400 a) v ol ? 150 250 mv upper threshold voltage (v in = 6.0 v) v thu 40 45 ? mv lower threshold voltage (v in = 6.0 v) v thl ? 60 95 mv hysteresis (v in = 6.0 v) v hy ? 15 ? mv shutdown input input logic voltage v shtdn v logic ?0? (regulator ?on?) 0 ? 0.7 logic ?1? (regulator ?off?) 2.0 ? 30 shutdown pin input current i shtdn a v shtdn = 2.4 v ? 35 50 v shtdn = 30 v ? 450 600 regulator output current in shutdown mode i off ? 3.0 10 a (v in = 30 v, v shtdn = 2.0 v, v o = 0, pin 6 connected to pin 7) product parametric performance is indicated in the electrical characteristics for the listed test conditions, unless otherwise noted. product performance may not be indicated by the electrical characteristics if operated under different conditions. 6. the junction?to?ambient thermal resistance is determined by pcb copper area per figure 29. 7. esd data available upon request. 8. low duty pulse techniques are used during test to maintain junction temperature as close to ambient as possible. 9. v o(nom) is the part number voltage option. 10. noise tests on the lp2951 are made with a 0.01 f capacitor connected across pins 7 and 1. *ncv prefix is for automotive and other applications requiring site and change control.
lp2950, lp2951, ncv2951 http://onsemi.com 6 definitions dropout voltage ? the input/output voltage differential at which the regulator output no longer maintains regulation against further reductions in input voltage. measured when the output drops 100 mv below its nominal value (which is measured at 1.0 v differential), dropout voltage is affected by junction temperature, load current and minimum input supply requirements. 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 techniques such that average chip temperature is not significantly affected. load regulation ? the change in output voltage for a change in load current at constant chip temperature. maximum power dissipation ? the maximum total device dissipation for which the regulator will operate within specifications. bias current ? current which is used to operate the regulator chip and is not delivered to the load. output noise voltage ? the rms ac voltage at the output, with constant load and no input ripple, measured over a specified frequency range. leakage current ? current drawn through a bipolar transistor collector?base junction, under a specified collector voltage, when the transistor is ?off?. upper threshold voltage ? voltage applied to the comparator input terminal, below the reference voltage which is applied to the other comparator input terminal, which causes the comparator output to change state from a logic ?0? to ?1?. lower threshold voltage ? voltage applied to the comparator input terminal, below the reference voltage which is applied to the other comparator input terminal, which causes the comparator output to change state from a logic ?1? to ?0?. hysteresis ? the difference between lower threshold voltage and upper threshold voltage. 25 c figure 2. quiescent current , output voltage (v) v out , output voltage (v) v out -50 5.00 0 6.0 0.1 10 t a , ambient temperature ( c) v in , input voltage (v) lp2950/lp2951 bias current (ma) i l , load current (ma) figure 3. 5.0 v dropout characteristics over load figure 4. output voltage versus temperature 1.0 10 100 1.0 2.0 3.0 4.0 5.0 6.0 0 50 100 150 1.0 0.1 0.01 5.0 4.0 3.0 2.0 1.0 0 4.99 4.98 4.97 4.96 4.95 r l = 50 k r l = 50 lp2951c t a = 25 c lp2951c 200 , output voltage (v) v out 0 6.0 v in , input voltage (v) figure 5. 5.0 v dropout characteristics with r l = 50 1.0 2.0 3.0 4.0 5.0 3.0 2.0 1.0 0 6.0 5.0 4.0 125 c ?40 c lp2951c
lp2950, lp2951, ncv2951 http://onsemi.com 7 r l dropout voltage (mv) = 50 t, temperature ( c) 0 8.0 -50 550 -100 4.70 5.0 0.1 400 , input voltage (v) t, time ( s) shutdown and output voltage (v) t, time ( s) , output voltage (v) v in , input voltage (v) dropout voltage (mv) i o , output current (ma) 1.0 10 100 0 50 100 150 4.74 4.78 4.82 4.86 100 200 300 4.90 400 500 600 700 800 0 100 200 300 400 300 200 0 500 450 400 300 7.5 7.0 6.5 6.0 5.5 4.0 3.0 1.0 0 5.0 3.0 1.0 -1.0 r l = 50 v in decreasing v in increasing v in v out r l = 50 k t a = 25 c c l = 1.0 f i l = 1.0 ma v o = 5.0 v t a = 25 c i l = 10 ma v in = 8.0 v v out = 5.0 v c l = 10 f shutdown input 350 r l dropout voltage (mv) = 50 k 55 50 45 40 30 35 350 250 150 100 2.0 output voltage change (mv) 4.0 2.0 0 -2.0 -6.0 -4.0 6.0 4.0 2.0 0 50 v in v out c l = 1.0 f t a = 25 c lp2951c r l = 330 k t a = 25 c 0 250 bias current ( a) v in , input voltage (v) figure 6. input current 5.0 10 15 20 25 200 150 100 50 0 0.1 ma load current no load figure 7. dropout voltage versus output curren t figure 8. dropout voltage versus temperature figure 9. error comparator output figure 10. line transient response figure 11. lp2951 enable transient
lp2950, lp2951, ncv2951 http://onsemi.com 8 1 0 100 100 4.0 -40 1.8 1.0 80 v out , output current (ma) v in , input voltage (v) voltage noise ( v/ hz) f, frequency (hz) shutdown threshold voltage (v) t, temperature ( c) ripple rejection (db) f, frequency (hz) t a = 25 c c l = 1.0 f v in = 6.0 v v out = 5.0 v c l = 1.0 f c l = 100 f i l = 0.1 ma i l = 100 ma t a = 25 c v o = 5.0 v lp2951c output off" output on" t a = 25 c lp2951cn 60 40 20 0 3.0 2.0 1.0 0 80 60 40 20 0 1.4 1.0 0.8 1.2 1.6 10 100 1.0 k 10 k 100 k 1.0 k 10 k 100 k -20 40 80 120 160 5.0 15 25 35 40 10 20 30 60 100 140 20 0 t a = 75 c 4.0 2.0 0 -2.0 -4.0 -6.0 output voltage change (mv) 0.01 0.1 10 100 1000 10000 0 102030405060708090100 output current (ma) esr (ohms) unstable region stable region unstable region for 0.1 f capacitor only 100 f 0.1 f v out = 5 v lower unstable region is for 0.1 f only. 1 f and 100 f show no instability with low esr values. 0 200 load current (ma) t, time (ms) figure 12. load transient response 4 2.5 0.5 1.5 2 3 3.5 1 150 100 0 -50 50 v out i load output voltage change (mv) 0 -200 200 400 -400 c l = 1.0 f v out = 5.0 v i l = 400 a to 75 ma t a = 25 c figure 13. ripple rejection figure 14. output noise figure 15. shutdown threshold voltage versus temperature figure 16. maximum rated output current figure 17. output stability versus output capacito r change
lp2950, lp2951, ncv2951 http://onsemi.com 9 applications information introduction the lp2950/lp2951 regulators are designed with internal current limiting and thermal shutdown making them user?friendly. typical application circuits for the lp2950 and lp2951 are shown in figures 20 through 28. these regulators are not internally compensated and thus require a 1.0 f (or greater) capacitance between the lp2950/lp2951 output terminal and ground for stability. most types of aluminum, tantalum or multilayer ceramic will perform adequately. solid tantalums or appropriate multilayer ceramic capacitors are recommended for operation below 25 c. at lower values of output current, less output capacitance is required for output stability. the capacitor can be reduced to 0.33 f for currents less than 10 ma, or 0.1 f for currents below 1.0 ma. using the 8 pin versions at voltages less than 5.0 v operates the error amplifier at lower values of gain, so that more output capacitance is needed for stability. for the worst case operating condition of a 100 ma load at 1.23 v output (output pin 1 connected to the feedback pin 7) a minimum capacitance of 3.3 f is recommended. the lp2950 will remain stable and in regulation when operated with no output load. when setting the output voltage of the lp2951 with external resistors, the resistance values should be chosen to draw a minimum of 1.0 a. a bypass capacitor is recommended across the lp2950/lp2951 input to ground if more than 4 inches of wire connects the input to either a battery or power supply filter capacitor. input capacitance at the lp2951 feedback pin 7 can create a pole, causing instability if high value external resistors are used to set the output voltage. adding a 100 pf capacitor between the output pin 1 and the feedback pin 7 and increasing the output filter capacitor to at least 3.3 f will stabilize the feedback loop. error detection comparator the comparator switches to a positive logic low whenever the lp2951 output voltage falls more than approximately 5.0% out of regulation. this value is the comparator?s designed?in of fset voltage of 60 mv divided by the 1.235 v internal reference. as shown in the representative block diagram. this trip level remains 5.0% below normal regardless of the value of regulated output voltage. for example, the error flag trip level is 4.75 v for a normal 5.0 v regulated output, or 9.50 v for a 10 v output voltage. figure 2 is a timing diagram which shows the error signal and the regulated output voltage as the input voltage to the lp2951 is ramped up and down. the error signal becomes valid (low) at about 1.3 v input. it goes high when the input reaches about 5.0 v (v out exceeds about 4.75 v). since the lp2951?s dropout voltage is dependent upon the load current (refer to the curve in the typical performance characteristics), the input voltage trip point will vary with load current. the output voltage trip point does not vary with load. the error comparator output is an open collector which requires an external pullup resistor. this resistor may be returned to the output or some other voltage within the system. the resistance value should be chosen to be consistent with the 400 a sink capability of the error comparator. a value between 100 k and 1.0 m is suggested. no pullup resistance is required if this output is unused. when operated in the power down mode (v in = 0 v), the error comparator output will go high if it has been pulled up to an external supply (the output transistor is in high impedance state). to avoid this invalid response, the error comparator output should be pulled up to v out (see figure 18). figure 18. error output timing 5.0 v 4.75 v 4.70 v 4.75 v + v dropout 4.70 v + v dropout 1.3 v 1.3 v not valid pullup to v out pullup to ext output voltage error input voltage not valid programming the output voltage (lp2951) the lp2951cx may be pin?strapped for the nominal fixed output voltage using its internal voltage divider by tying pin 1 (output) to pin 2 (sense) and pin 7 (feedback) to pin 6 (5.0 v tap). alternatively, it may be programmed for any output voltage between its 1.235 reference voltage and its 30 v maximum rating. an external pair of resistors is required, as shown in figure 19.
lp2950, lp2951, ncv2951 http://onsemi.com 10 figure 19. adjustable regulator error output shutdown input v in v out 1.23 to 30 v 3.3 f 0.01 f nc nc r 2 r1 100 k 5 3 error sd gnd fb 47 6 v o t sns 2 v out v in 8 1 the complete equation for the output voltage is: v out v ref ( 1 r1 r2 ) i fb r1 where v ref is the nominal 1.235 v reference voltage and i fb is the feedback pin bias current, nominally ? 20 na. the minimum recommended load current of 1.0 a forces an upper limit of 1.2 m on the value of r2, if the regulator must work with no load. i fb will produce a 2% typical error in v out which may be eliminated at room temperature by adjusting r1. for better accuracy, choosing r2 = 100 k reduces this error to 0.17% while increasing the resistor program current to 12 a. since the lp2951 typically draws 75 a at no load with pin 2 open circuited, the extra 12 a of current drawn is often a worthwhile tradeoff for eliminating the need to set output voltage in test. output noise in many applications it is desirable to reduce the noise present at the output. reducing the regulator bandwidth by increasing the size of the output capacitor is the only method for reducing noise on the 3 lead lp2950. however, increasing the capacitor from 1.0 f to 220 f only decreases the noise from 430 v to 160 vrms for a 100 khz bandwidth at the 5.0 v output. noise can be reduced fourfold by a bypass capacitor across r1, since it reduces the high frequency gain from 4 to unity. pick c bypass 1 2 r1 x 200 hz or about 0.01 f. when doing this, the output capacitor must be increased to 3.3 f to maintain stability. these changes reduce the output noise from 430 v to 126 vrms for a 100 khz bandwidth at 5.0 v output. with bypass capacitor added, noise no longer scales with output voltage so that improvements are more dramatic at higher output voltages. figure 20. 1.0 a regulator with 1.2 v dropout 0.01 f 10 k mtb23p06e 1.0 f unregulated input error output shutdown input v out 5.0 v 1.0% 0 to 1.0 a 220 f 2.0 k 5 3 error sd gnd fb 47 6 v o t sns 2 v out v in 8 1 0.002 f 1.0 m lp2951cn
lp2950, lp2951, ncv2951 http://onsemi.com 11 typical applications figure 21. lithium ion battery cell charger 1n4001 gnd 4.2 v 0.025 v nc nc 50 k 5 3 error sd gnd fb 47 6 v o t sns 2 v out v in 8 1 0.1 f nc lp2951cn 2.2 f 330 pf 806 k 1.0% 2.0 m 1.0% lithium ion rechargeable cell unregulated input 6.0 to 10 vdc figure 22. low drift current sink error output shutdown input +v = 2.0 to 30 v 1.0 f r 5 3 error sd gnd fb 47 6 v o t sns 2 v out v in 8 1 0.1 f load i l = 1.23/r i l figure 23. latch off when error flag occurs reset +v in v out 1.0 f nc nc r2 r1 470 k 5 3 error sd gnd fb 47 6 v o t sns 2 v out v in 8 1 lp2951cn 470 k error flag occurs when v in is too low to maintain v out , or if v out is re- duced by excessive load current. normally closed 2n3906 figure 24. 5.0 v regulator with 2.5 v sleep function *sleep input +v in v out 3.3 f nc nc 100 k 100 k 470 k 5 3 error sd gnd fb 47 6 v o t sns 2 v out v in 8 1 lp2951cn 200 k 100 pf 2n3906 47 k cmos gate error output shutdown input lp2951cn
lp2950, lp2951, ncv2951 http://onsemi.com 12 330 k figure 25. regulator with early warning and auxiliary output +v in memory v+ 1.0 f 20 5 3 error sd gnd fb 47 6 v o t sns 2 v out v in 8 1 lp2951cn #1 1.0 f 5 3 error sd gnd fb 47 6 v o t sns 2 v out v in 8 1 lp2951cn #2 nc reset v dd p early warning all diodes are 1n4148. early warning flag on low input voltage. main output latches off at lower input voltages. battery backup on auxiliary output. operation: regulator #1?s v out is programmed one diode drop above 5.0 v. its error flag becomes active when v in < 5.7 v. when v in drops below 5.3 v, the error flag of regulator #2 becomes active and via q1 latches the main output ?off?. when v in again exceeds 5.7 v, regulator #1 is back in regulation and the early warning signal rises, unlatching regulator #2 via d3. d4 2.7 m q1 2n3906 d2 d1 d3 27 k 3.6 v nicad main output figure 26. 2.0 a low dropout regulator +v in v out @ 2.0 a 100 f nc nc r2 r1 470 5 3 error sd gnd fb 47 6 v o t sns 2 v out v in 8 1 lp2951cn mje2955 4.7 m error flag v out = 1.25v (1.0 + r1/r2) for 5.0 v output, use internal resistors. wire pin 6 to 7, and wire pin 2 to +v out bus. 20 k 47 4.7 f tant 0.05 680 0.033 f 2n3906 10 k current limit section 220 1000 f .33 f .01 f 2n3906
lp2950, lp2951, ncv2951 http://onsemi.com 13 figure 27. open circuit detector for 4.0 to 20 ma current loop 5 3 error sd gnd fb 47 6 v o t sns 2 v out v in 8 1 lp2951cn nc output* 0.1 f nc nc nc 1n457 1n457 360 1n457 1n4001 24 + 5.0 v 4.7 k 15 20 ma 4 * high for i l < 3.5 ma figure 28. low battery disconnect 2n3906 5 3 error sd gnd fb 47 6 v o t sns 2 v out v in 8 1 lp2951cn nc 1.0 f nc 2 3 1 20 main v+ memory v+ 6.0 v lead-acid battery nicad backup battery 100 k 31.6 k mc34164p?5 nc r , thermal resistance ja junction\to\air ( c/w) 40 50 60 70 80 90 100 0 0.4 0.8 1.2 1.6 2.0 2.4 0102030 25 15 5.0 l, length of copper (mm) p d(max) for t a = 50 c minimum size pad p d l l ??? ??? ??? ??? ja 2.0 oz. copper figure 29. dpak thermal resistance and maximum power dissipation versus pcb copper length
lp2950, lp2951, ncv2951 http://onsemi.com 14 ordering information (lp2950) part number output voltage (volts) tolerance (%) package shipping ? lp2950cz?3.0g 3.0 1.0 to?92 (pb?free) 2000 units / bag lp2950cz?3.0rag 3.0 1.0 to?92 (pb?free) 2000 units / tape & reel lp2950acz?3.0g 3.0 0.5 to?92 (pb?free) 2000 units / bag lp2950acz?3.0rag 3.0 0.5 to?92 (pb?free) 2000 units / tape & reel lp2950cz?3.3g 3.3 1.0 to?92 (pb?free) 2000 units / bag lp2950cz?3.3rag 3.3 1.0 to?92 (pb?free) 2000 units / tape & reel lp2950acz?3.3g 3.3 0.5 to?92 (pb?free) 2000 units / bag lp2950acz?3.3rag 3.3 0.5 to?92 (pb?free) 2000 units / tape & reel lp2950cz?5.0g 5.0 1.0 to?92 (pb?free) 2000 units / bag lp2950cz?5.0rag 5.0 1.0 to?92 (pb?free) 2000 units / tape & reel lp2950cz?5.0rpg 5.0 1.0 to?92 (pb?free) 2000 units / ammo pack lp2950acz?5.0g 5.0 0.5 to?92 (pb?free) 2000 units / bag lp2950acz?5.0rag 5.0 0.5 to?92 (pb?free) 2000 units / tape & reel lp2950cdt?3.0g 3.0 1.0 dpak (pb?free) 75 units / rail lp2950cdt?3.0rkg 3.0 1.0 dpak (pb?free) 2500 units / tape & reel lp2950acdt?3.0g 3.0 0.5 dpak (pb?free) 75 units / rail lp2950acdt?3rkg 3.0 0.5 dpak (pb?free) 2500 units / tape & reel lp2950cdt?3.3g 3.3 1.0 dpak (pb?free) 75 units / rail lp2950cdt?3.3rkg 3.3 1.0 dpak (pb?free) 2500 units / tape & reel lp2950acdt?3.3rg 3.3 0.5 dpak (pb?free) 2500 units / tape & reel lp2950cdt?5.0g 5.0 1.0 dpak (pb?free) 75 units / rail lp2950cdt?5.0rkg 5.0 1.0 dpak (pb?free) 2500 units / tape & reel lp2950acdt?5.0g 5.0 0.5 dpak (pb?free) 75 units / rail lp2950acdt?5rkg 5.0 0.5 dpak (pb?free) 2500 units / tape & reel ?for information on tape and reel specifications, including part orientation and tape sizes, please refer to our tape and reel packaging specifications brochure, brd8011/d.
lp2950, lp2951, ncv2951 http://onsemi.com 15 ordering information (lp2951) part number output voltage (volts) tolerance (%) package shipping ? lp2951cd?3.0g 3.0 1.0 soic?8 (pb?free) 98 units / rail lp2951cd?3.0r2g 3.0 1.0 soic?8 (pb?free) 2500 units / tape & reel lp2951acd?3.0g 3.0 0.5 soic?8 (pb?free) 98 units / rail lp2951acd?3.0r2g 3.0 0.5 soic?8 (pb?free) 2500 units / tape & reel lp2951cd?3.3g 3.3 1.0 soic?8 (pb?free) 98 units / rail lp2951cd?3.3r2g 3.3 1.0 soic?8 (pb?free) 2500 units / tape & reel lp2951acd?3.3g 3.3 0.5 soic?8 (pb?free) 98 units / rail lp2951acd?3.3r2g 3.3 0.5 soic?8 (pb?free) 2500 units / tape & reel lp2951cdg 5.0 or adj. 1.0 soic?8 (pb?free) 98 units / rail lp2951cdr2g 5.0 or adj. 1.0 soic?8 (pb?free) 2500 units / tape & reel lp2951acdg 5.0 or adj. 0.5 soic?8 (pb?free) 98 units / rail lp2951acdr2g 5.0 or adj. 0.5 soic?8 (pb?free) 2500 units / tape & reel lp2951cdm?3.0r2g 3.0 1.0 micro8 (pb?free) 4000 units / tape & reel lp2951acdm?3.0rg 3.0 0.5 micro8 (pb?free) 4000 units / tape & reel lp2951cdm?3.3r2g 3.3 1.0 micro8 (pb?free) 4000 units / tape & reel lp2951acdm?3.3rg 3.3 0.5 micro8 (pb?free) 4000 units / tape & reel lp2951cdmr2g 5.0 or adj. 1.0 micro8 (pb?free) 4000 units / tape & reel lp2951acdmr2g 5.0 or adj. 0.5 micro8 (pb?free) 4000 units / tape & reel lp2951acn?3.0g 3.0 0.5 pdip?8 (pb?free) 50 units / rail lp2951cn?3.3g 3.3 1.0 pdip?8 (pb?free) 50 units / rail lp2951acn?3.3g 3.3 0.5 pdip?8 (pb?free) 50 units / rail lp2951cng 5.0 or adj. 1.0 pdip?8 (pb?free) 50 units / rail lp2951acng 5.0 or adj. 0.5 pdip?8 (pb?free) 50 units / rail ?for information on tape and reel specifications, including part orientation and tape sizes, please refer to our tape and reel packaging specifications brochure, brd8011/d.
lp2950, lp2951, ncv2951 http://onsemi.com 16 ordering information (ncv2951) part number output voltage (volts) tolerance (%) package shipping ? ncv2951acd3.3r2g* 3.3 0.5 soic?8 (pb?free) 2500 units / tape & reel NCV2951ACDR2G* 5.0 or adj. 0.5 soic?8 (pb?free) 2500 units / tape & reel ncv2951cdr2g* 5.0 or adj. 1.0 soic?8 (pb?free) 2500 units / tape & reel ?for information on tape and reel specifications, including part orientation and tape sizes, please refer to our tape and reel packaging specifications brochure, brd8011/d. *ncv prefix for automotive and other applications requiring unique site and control change requirements; aec?q100 qualified and ppap capable.
lp2950, lp2951, ncv2951 http://onsemi.com 17 xx = 3.0, 3.3, or 5.0 y = 3 or 5 yy = 30, 33, or 50 z = a or c a = assembly location wl, l = wafer lot yy, y = year ww, w = work week g = pb?free package = pb?free package (note: microdot may be in either location) marking diagrams 2950 cz?xx alyww to?92 case 029 * *this marking diagram also applies to ncv2951. * 50?yg alyww 50a?yg alyww 50?yyg alyww dpak case 369c 50ayyg alyww soic?8 case 751 micro8 case 846a 51cn awl yywwg pdip?8 case 626 1 8 51z alyw 1 8 51z?33 alyw 1 8 51z?3 alyw 1 8 payy ayw 1 8 p?yy ayw 1 8 2950a cz?xx alyww 51acn awl yywwg 1 8 51cn?xx awl yywwg 1 8 51acn?xx awl yywwg 1 8
lp2950, lp2951, ncv2951 http://onsemi.com 18 package dimensions to?226aa/to?92 z suffix case 29?11 issue am notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: inch. 3. contour of package beyond dimension r is uncontrolled. 4. lead dimension is uncontrolled in p and beyond dimension k minimum. r a p j l b k g h section x?x c v d n n xx seating plane dim min max min max millimeters inches a 0.175 0.205 4.45 5.20 b 0.170 0.210 4.32 5.33 c 0.125 0.165 3.18 4.19 d 0.016 0.021 0.407 0.533 g 0.045 0.055 1.15 1.39 h 0.095 0.105 2.42 2.66 j 0.015 0.020 0.39 0.50 k 0.500 --- 12.70 --- l 0.250 --- 6.35 --- n 0.080 0.105 2.04 2.66 p --- 0.100 --- 2.54 r 0.115 --- 2.93 --- v 0.135 --- 3.43 --- 1 notes: 1. dimensioning and tolerancing per asme y14.5m, 1994. 2. controlling dimension: millimeters. 3. contour of package beyond dimension r is uncontrolled. 4. lead dimension is uncontrolled in p and beyond dimension k minimum. r a p j b k g section x?x c v d n xx seating plane dim min max millimeters a 4.45 5.20 b 4.32 5.33 c 3.18 4.19 d 0.40 0.54 g 2.40 2.80 j 0.39 0.50 k 12.70 --- n 2.04 2.66 p 1.50 4.00 r 2.93 --- v 3.43 --- 1 t straight lead bulk pack bent lead tape & reel ammo pack
lp2950, lp2951, ncv2951 http://onsemi.com 19 package dimensions dpak (single gauge) case 369c issue e b d e b3 l3 l4 b2 m 0.005 (0.13) c c2 a c c z dim min max min max millimeters inches d 0.235 0.245 5.97 6.22 e 0.250 0.265 6.35 6.73 a 0.086 0.094 2.18 2.38 b 0.025 0.035 0.63 0.89 c2 0.018 0.024 0.46 0.61 b2 0.028 0.045 0.72 1.14 c 0.018 0.024 0.46 0.61 e 0.090 bsc 2.29 bsc b3 0.180 0.215 4.57 5.46 l4 ??? 0.040 ??? 1.01 l 0.055 0.070 1.40 1.78 l3 0.035 0.050 0.89 1.27 z 0.155 ??? 3.93 ??? notes: 1. dimensioning and tolerancing per asme y14.5m, 1994. 2. controlling dimension: inches. 3. thermal pad contour optional within di- mensions b3, l3 and z. 4. dimensions d and e do not include mold flash, protrusions, or burrs. mold flash, protrusions, or gate burrs shall not exceed 0.006 inches per side. 5. dimensions d and e are determined at the outermost extremes of the plastic body. 6. datums a and b are determined at datum plane h. 7. optional mold feature. 12 3 4 5.80 0.228 2.58 0.102 1.60 0.063 6.20 0.244 3.00 0.118 6.17 0.243 mm inches scale 3:1 *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* h 0.370 0.410 9.40 10.41 a1 0.000 0.005 0.00 0.13 l1 0.114 ref 2.90 ref l2 0.020 bsc 0.51 bsc a1 h detail a seating plane a b c l1 l h l2 gauge plane detail a rotated 90 cw e bottom view z bottom view side view top view alternate construction note 7
lp2950, lp2951, ncv2951 http://onsemi.com 20 package dimensions soic?8 nb case 751?07 issue ak seating plane 1 4 5 8 n j x 45 k notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: millimeter. 3. dimension a and b do not include mold protrusion. 4. maximum mold protrusion 0.15 (0.006) per side. 5. dimension d does not include dambar protrusion. allowable dambar protrusion shall be 0.127 (0.005) total in excess of the d dimension at maximum material condition. 6. 751?01 thru 751?06 are obsolete. new standard is 751?07. a b s d h c 0.10 (0.004) dim a min max min max inches 4.80 5.00 0.189 0.197 millimeters b 3.80 4.00 0.150 0.157 c 1.35 1.75 0.053 0.069 d 0.33 0.51 0.013 0.020 g 1.27 bsc 0.050 bsc h 0.10 0.25 0.004 0.010 j 0.19 0.25 0.007 0.010 k 0.40 1.27 0.016 0.050 m 0 8 0 8 n 0.25 0.50 0.010 0.020 s 5.80 6.20 0.228 0.244 ?x? ?y? g m y m 0.25 (0.010) ?z? y m 0.25 (0.010) z s x s m 1.52 0.060 7.0 0.275 0.6 0.024 1.270 0.050 4.0 0.155 mm inches scale 6:1 *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*
lp2950, lp2951, ncv2951 http://onsemi.com 21 package dimensions pdip?8 case 626?05 issue n 14 5 8 b2 note 8 d b l a1 a eb e a top view c seating plane 0.010 ca side view end view end view with leads constrained dim min max inches a ???? 0.210 a1 0.015 ???? b 0.014 0.022 c 0.008 0.014 d 0.355 0.400 d1 0.005 ???? e 0.100 bsc e 0.300 0.325 m ???? 10 ??? 5.33 0.38 ??? 0.35 0.56 0.20 0.36 9.02 10.16 0.13 ??? 2.54 bsc 7.62 8.26 ??? 10 min max millimeters notes: 1. dimensioning and tolerancing per asme y14.5m, 1994. 2. controlling dimension: inches. 3. dimensions a, a1 and l are measured with the pack- age seated in jedec seating plane gauge gs?3. 4. dimensions d, d1 and e1 do not include mold flash or protrusions. mold flash or protrusions are not to exceed 0.10 inch. 5. dimension e is measured at a point 0.015 below datum plane h with the leads constrained perpendicular to datum c. 6. dimension e3 is measured at the lead tips with the leads unconstrained. 7. datum plane h is coincident with the bottom of the leads, where the leads exit the body. 8. package contour is optional (rounded or square corners). e1 0.240 0.280 6.10 7.11 b2 eb ???? 0.430 ??? 10.92 0.060 typ 1.52 typ e1 m 8x c d1 b a2 0.115 0.195 2.92 4.95 l 0.115 0.150 2.92 3.81 h note 5 e e/2 a2 note 3 m b m note 6 m
lp2950, lp2951, ncv2951 http://onsemi.com 22 package dimensions micro8 case 846a?02 issue j s b m 0.08 (0.003) a s t notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: millimeter. 3. dimension a does not include mold flash, protrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 0.15 (0.006) per side. 4. dimension b does not include interlead flash or protrusion. interlead flash or protrusion shall not exceed 0.25 (0.010) per side. 5. 846a-01 obsolete, new standard 846a-02. b e pin 1 id 8 pl 0.038 (0.0015) ?t? seating plane a a1 c l *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* dim a min nom max min millimeters ?? ?? 1.10 ?? inches a1 0.05 0.08 0.15 0.002 b 0.25 0.33 0.40 0.010 c 0.13 0.18 0.23 0.005 d 2.90 3.00 3.10 0.114 e 2.90 3.00 3.10 0.114 e 0.65 bsc l 0.40 0.55 0.70 0.016 ?? 0.043 0.003 0.006 0.013 0.016 0.007 0.009 0.118 0.122 0.118 0.122 0.026 bsc 0.021 0.028 nom max 4.75 4.90 5.05 0.187 0.193 0.199 h e h e d d e 8x 0.48 0.65 pitch 5.25 8x 0.80 dimension: millimeters recommended on semiconductor and are registered trademarks of semiconductor co mponents industries, llc (scillc). scillc owns the rights to a numb er of patents, trademarks, copyrights, trade secrets, and other intellectual property. a list ing of scillc?s product/patent coverage may be accessed at ww w.onsemi.com/site/pdf/patent?marking.pdf. scillc reserves the right to make changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and s pecifically disclaims any and all liability, including without limitation special, consequential or incidental damages. ?typical? parameters which may be provided in scillc data sheets and/ or specifications can and do vary in different applications and actual performance may vary over time. all operating parame ters, including ?typicals? must be validated for each customer application by customer?s technical experts. scillc does not convey any license under its patent rights nor the right s of others. scillc products are not designed, intended, or a uthorized 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 whic h the failure of the scillc product could create a situation where personal injury or death may occur. should buyer purchase or us e scillc products for any such unintended or unauthorized appli cation, buyer shall indemnify and hold scillc and its officers, employees, subsidiaries, affiliates, and distribut ors 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 unin tended or unauthorized use, even if such claim alleges that scil lc 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 copyrig ht laws and is not for resale in any manner. p ublication 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 lp2950/d micro8 is a trademark of international rectifier. 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 : www.onsemi.com order literature : http://www.onsemi.com/orderlit for additional information, please contact your loc al sales representative

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