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? semiconductor components industries, llc, 2002 january, 2002 rev. 8 1 publication order number: lp2950/d lp2950, lp2951 100 ma, 3.0 v, 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 inputtooutput voltage differential. these devices feature a very low quiescent bias current of 75 m 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 poweron 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 turnoff or turnon the regulator output. due to the low inputtooutput 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 dualinline, so8 and micro8 surface mount packages. the `a' suffix devices feature an initial output voltage tolerance 0.5%. lp2950 and lp2951 features: ? low quiescent bias current of 75 m a ? low inputtooutput voltage differential of 50 mv at 100 m 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 m f output capacitor for stability ? internal current and thermal limiting 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.) to92 z suffix case 29 http://onsemi.com see detailed ordering and shipping information in the package dimensions section on pages 13 and 14 of this data sheet. ordering information pin connections 2 3 1 pin: 1. output 2. ground 3. input dpak dt suffix case 369a 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 so8 d suffix case 751 pdip8 n suffix case 626 micro8 dm suffix case 846a 1 3
lp2950, lp2951 http://onsemi.com 2 device information output voltage operating junction package 3.0v 3.3v 5.0v adjustable operating j u nction temperature range to92 suffix z lp2950cz3.0 lp2950acz3.0 lp2950cz3.3 lp2950acz3.3 lp2950cz5.0 lp2950acz5.0 not available t j = 40 to +125 c dpak suffix dt lp2950cdt3.0 lp2950acdt3.0 lp2950cdt3.3 lp2950acdt3.3 lp2950cdt5.0 lp2950acdt5.0 not available t j = 40 to +125 c so8 suffix d lp2951cd3.0 lp2951acd3.0 lp2951cd3.3 lp2951acd3.3 lp2951cd lp2951acd lp2951cd lp2951acd t j = 40 to +125 c micro8 suffix dm lp2951cdm3.0 lp2951acdm3.0 lp2951cdm3.3 lp2951acdm3.3 lp2951cdm lp2951acdm lp2951cdm lp2951acdm t j = 40 to +125 c dip8 suffix n lp2951cn3.0 lp2951acn3.0 lp2951cn3.3 lp2951acn3.3 lp2951cn lp2951acn lp2951cn lp2951acn t j = 40 to +125 c lp2950cxxx / lp2951cxxxx 1% output voltage precision at t j = 25 c lp2950acxxx / lp2951acxxxx 0.5% output voltage precision at t j = 25 c from cmos/ttl 3 figure 1. representative block diagrams this device contains 34 active transistors. lp2950cz5.0 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 m f gnd 4 182 k 60 k 1.23 v reference 1.0 m 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 http://onsemi.com 3 maximum ratings (t a = 25 c, unless otherwise noted.) rating symbol value unit input voltage v cc 30 vdc power dissipation and thermal characteristics maximum power dissipation p d internally limited w case 751(so8) d suffix thermal resistance, junctiontoambient r q ja 180 c/w thermal resistance, junctiontocase r q jc 45 c/w case 369a (dpak) dt suffix (note 1) thermal resistance, junctiontoambient r q ja 92 c/w thermal resistance, junctiontocase r q jc 6.0 c/w case 29 (to226aa/to92) z suffix thermal resistance, junctiontoambient r q ja 160 c/w thermal resistance, junctiontocase r q jc 83 c/w case 626 n suffix thermal resistance, junctiontoambient r q ja 105 c/w case 846a (micro8) dm suffix thermal resistance, junctiontoambient r q 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 junction temperature t j 40 to +125 c storage temperature range t stg 65 to +150 c electrical characteristics (v in = v o + 1.0 v, i o = 100 m a, c o = 1.0 m f, t j = 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 m a, t j = 25 c lp2950c5.0/lp2951c 4.950 5.000 5.050 lp2950ac5.0/lp2951ac 4.975 5.000 5.025 t j = 40 to +125 c lp2950c5.0/lp2951c 4.900 5.100 lp2950ac5.0/lp2951ac 4.940 5.060 v in = 6.0 to 30 v, i o = 100 m a to 100 ma, t j = 40 to +125 c lp2950c5.0/lp2951c 4.880 5.120 lp2950ac5.0/lp2951ac 4.925 5.075 output voltage, 3.3 v versions v o v v in = 4.3 v, i o = 100 m a, t j = 25 c lp2950c3.3/lp2951c3.3 3.267 3.300 3.333 lp2950ac3.3/lp2951ac3.3 3.284 3.300 3.317 t j = 40 to +125 c lp2950c3.3/lp2951c3.3 3.234 3.366 lp2950ac3.3/lp2951ac3.3 3.260 3.340 v in = 4.3 to 30 v, i o = 100 m a to 100 ma, t j = 40 to +125 c lp2950c3.3/lp2951c3.3 3.221 3.379 lp2950ac3.3/lp2951ac3.3 3.254 3.346 output voltage, 3.0 v versions v o v v in = 4.0 v, i o = 100 m a, t j = 25 c lp2950c3.0/lp2951c3.0 2.970 3.000 3.030 lp2950ac3.0/lp2951ac3.0 2.985 3.000 3.015 t j = 40 to +125 c lp2950c3.0/lp2951c3.0 2.940 3.060 lp2950ac3.0/lp2951ac3.0 2.964 3.036 v in = 4.0 to 30 v, i o = 100 m a to 100 ma, t j = 40 to +125 c lp2950c3.0/lp2951c3.0 2.928 3.072 lp2950ac3.0/lp2951ac3.0 2.958 3.042 1. the junctiontoambient thermal resistance is determined by pc board copper area per figure 27. 2. esd data available upon request. 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 m f capacitor connected across pins 7 and 1.
lp2950, lp2951 http://onsemi.com 4 electrical characteristics (continued) (v in = v o + 1.0 v, i o = 100 m a, c o = 1.0 m f, t j = 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 % lp2950cxx/lp2951c/lp2951cxx 0.08 0.20 lp2950acxx/lp2951ac/lp2951acxx 0.04 0.10 load regulation (i o = 100 m a to 100 ma) reg load % lp2950cxx/lp2951c/lp2951cxx 0.13 0.20 lp2950acxx/lp2951ac/lp2951acxx 0.05 0.10 dropout voltage v i v o mv i o = 100 m a 30 80 i o = 100 ma 350 450 supply bias current i cc i o = 100 m a 93 120 m a i o = 100 ma 4.0 12 ma dropout supply bias current (v in = v o(nom) 0.5 v, i o = 100 m a) (note 9) i ccdropout 110 170 m 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 m vrms c l = 1.0 m f 126 c l = 100 m f 56 lp2951a/lp2951ac only reference voltage (t j = 25 c) v ref v lp2951c/lp2951cxx 1.210 1.235 1.260 lp2951ac/lp2951acxx 1.220 1.235 1.250 reference voltage (t j = 40 to +125 c) v ref v lp2951c/lp2951cxx 1.200 1.270 lp2951ac/lp2951acxx 1.200 1.260 reference voltage (t j = 40 to +125 c) v ref v i o = 100 m a to 100 ma, v in = 23 to 30 v lp2951c/lp2951cxx 1.185 1.285 lp2951ac/lp2951acxx 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 m a output low voltage (v in = 4.5 v, i ol = 400 m 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 a0o (regulator aono) 0 0.7 logic a1o (regulator aoffo) 2.0 30 shutdown pin input current i shtdn m 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 m a (v in = 30 v, v shtdn = 2.0 v, v o = 0, pin 6 connected to pin 7) 6. the junctiontoambient thermal resistance is determined by pc board copper area per figure 27. 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 m f capacitor connected across pins 7 and 1.
lp2950, lp2951 http://onsemi.com 5 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 collectorbase junction, under a specified collector voltage, when the transistor is aoffo. 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 a0o to a1o. 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 a1o to a0o. hysteresis the difference between lower threshold voltage and upper threshold voltage. figure 2. quiescent current , output voltage (v) v out , output voltage (v) v out -50 5.00 0 6.0 0 250 0.1 10 t a , ambient temperature ( c) v in , input voltage (v) bias current ( a) m v in , input voltage (v) lp2950/lp2951 bias current (ma) i l , load current (ma) figure 3. dropout characteristics figure 4. input current figure 5. output voltage versus temperature 1.0 10 100 1.0 2.0 3.0 4.0 5.0 6.0 5.0 10 15 20 25 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 4.95 200 150 100 50 0 r l = 50 k r l = 50 w 0.1 ma load current no load lp2951c t a = 25 c lp2951c 200
lp2950, lp2951 http://onsemi.com 6 r l dropout voltage (mv) = 50 t, temperature ( c) 0 200 0 8.0 -50 550 -100 7.0 4.70 5.0 0.1 400 load current (ma) t, time (ms) , input voltage (v) t, time ( m s) shutdown and output voltage (v) t, time ( m s) , output voltage (v) v in , input voltage (v) dropout voltage (mv) figure 6. dropout voltage versus output current i o , output current (ma) figure 7. dropout voltage versus temperature figure 8. error comparator output figure 9. line transient response figure 10. lp2951 enable transient figure 11. load transient response 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 4 2.5 0.5 1.5 2 3 3.5 1 300 200 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 -1.0 150 100 0 -50 50 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 m f i l = 1.0 ma v o = 5.0 v v out i load t a = 25 c i l = 10 ma v in = 8.0 v v out = 5.0 v c l = 10 m 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 output voltage change ( mv ) 0 -200 200 400 -400 6.0 4.0 2.0 0 50 v in v out c l = 1.0 m f t a = 25 c lp2951c r l = 330 k t a = 25 c c l = 1.0 m f v out = 5.0 v i l = 400 a to 75 ma t a = 25 c
lp2950, lp2951 http://onsemi.com 7 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) figure 12. ripple rejection f, frequency (hz) figure 13. output noise figure 14. shutdown threshold voltage versus temperature figure 15. maximum rated output current t a = 25 c c l = 1.0 m f v in = 6.0 v v out = 5.0 v c l = 1.0 m f m c l = 100 m 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 )
lp2950, lp2951 http://onsemi.com 8 applications information introduction the lp2950/lp2951 regulators are designed with internal current limiting and thermal shutdown making them userfriendly. typical application circuits for the lp2950 and lp2951 are shown in figures 18 through 26. these regulators are not internally compensated and thus require a 1.0 m 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 m f for currents less than 10 ma, or 0.1 m f for currents below 1.0 ma. using the 8pin 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 m 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 m 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 m 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 designedin 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 m a sink capability of the error comparator. a value between 100 k and 1.0 m w is suggested. no pullup resistance is required if this output is unused. when operated in the shutdown mode, the error comparator output will go high if it has been pulled up to an external supply. to avoid this invalid response, the error comparator output should be pulled up to v out (see figure 16). figure 16. 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 pull-up to v out pull-up to ext output voltage error input voltage not valid programming the output voltage (lp2951) the lp2951cx may be pinstrapped 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 17.
lp2950, lp2951 http://onsemi.com 9 figure 17. adjustable regulator error output shutdown input v in v out 1.23 to 30 v 3.3 m f 0.01 m 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 m a forces an upper limit of 1.2 m w 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 m a. since the lp2951 typically draws 75 m a at no load with pin 2 open circuited, the extra 12 m 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 m f to 220 m f only decreases the noise from 430 m v to 160 m 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 m f. when doing this, the output capacitor must be increased to 3.3 m f to maintain stability. these changes reduce the output noise from 430 m v to 126 m 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 18. 1.0 a regulator with 1.2 v dropout 0.01 m f 10 k mtb23p06e 1.0 m f unregulated input error output shutdown input v out 5.0 v 1.0% 0 to 1.0 a 220 m 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 m f 1.0 m lp2951cn
lp2950, lp2951 http://onsemi.com 10 typical applications figure 19. 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 m f nc lp2951cn 2.2 m f 330 pf 806 k 1.0% 2.0 m 1.0% lithium ion rechargeable cell unregulated input 6.0 to 10 vdc figure 20. low drift current sink error output shutdown input +v = 2.0 to 30 v 1.0 m f r 5 3 error sd gnd fb 47 6 v o t sns 2 v out v in 8 1 0.1 m f load i l = 1.23/r i l figure 21. latch off when error flag occurs reset +v in v out 1.0 m 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 reduced by excessive load current. normally closed 2n3906 figure 22. 5.0 v regulator with 2.5 v sleep function *sleep input +v in v out 3.3 m 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 http://onsemi.com 11 330 k figure 23. regulator with early warning and auxiliary output +v in memory v+ 1.0 m 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 m 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 m 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 aoffo. 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 24. 2.0 a low dropout regulator +v in v out @ 2.0 a 100 m 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 m f tant 0.05 680 0.033 m f 2n3906 10 k current limit section 220 1000 m f .33 m f .01 m f 2n3906
lp2950, lp2951 http://onsemi.com 12 figure 25. 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 m 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 26. 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 m f nc 2 3 1 20 main v+ memory v+ 6.0 v lead-acid battery nicad backup battery 100 k 31.6 k mc34164p5 nc r , thermal resistance ja q junctiontoair ( 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 ??? ??? ??? ??? , maximum power dissipation (w) free air mounted vertically r q ja 2.0 oz. copper figure 27. dpak thermal resistance and maximum power dissipation versus p.c.b. copper length
lp2950, lp2951 http://onsemi.com 13 ordering information (lp2950) part number output voltage (volts) tolerance (%) package shipping lp2950cz3.0 3.0 1.0 to92 2000 units / bag lp2950acz3.0 3.0 0.5 to92 2000 units / bag lp2950cz3.3 3.3 1.0 to92 2000 units / bag lp2950acz3.3 3.3 0.5 to92 2000 units / bag lp2950cz3.3ra 3.3 1.0 to92 2000 units / tape & reel lp2950acz3.3ra 3.3 0.5 to92 2000 units / tape & reel lp2950cz5.0 5.0 1.0 to92 2000 units / bag lp2950acz5.0 5.0 0.5 to92 2000 units / bag lp2950cz5.0ra 5.0 1.0 to92 2000 units / tape & reel lp2950cz5.0rp 5.0 1.0 to92 2000 units / ammo pack lp2950acz5.0ra 5.0 0.5 to92 2000 units / tape & reel lp2950cdt3.0 3.0 1.0 dpak 75 units / rail lp2950cdt3.0rk 3.0 1.0 dpak 2500 units / tape & reel lp2950acdt3.0 3.0 0.5 dpak 75 units / rail lp2950cdt3.3 3.3 1.0 dpak 75 units / rail lp2950cdt3.3rk 3.3 1.0 dpak 2500 units / tape & reel lp2950acdt3.3 3.3 0.5 dpak 75 units / rail lp2950cdt5.0 5.0 1.0 dpak 75 units / rail lp2950cdt5.0rk 5.0 1.0 dpak 2500 units / tape & reel lp2950acdt5.0 5.0 0.5 dpak 75 units / rail lp2950acdt5.0rk 5.0 0.5 dpak 2500 units / tape & reel
lp2950, lp2951 http://onsemi.com 14 ordering information (lp2951) part number output voltage (volts) tolerance (%) package shipping lp2951cd3.0 3.0 or adj. 1.0 so8 98 units / rail lp2951cd3.0r2 3.0 or adj. 1.0 so8 2500 units / tape & reel lp2951acd3.0 3.0 or adj. 0.5 so8 98 units / rail lp2951acd3.0r2 3.0 or adj. 0.5 so8 2500 units / tape & reel lp2951cd3.3 3.3 or adj. 1.0 so8 98 units / rail lp2951cd3.3r2 3.3 or adj. 1.0 so8 2500 units / tape & reel lp2951acd3.3 3.3 or adj. 0.5 so8 98 units / rail lp2951acd3.3r2 3.3 or adj. 0.5 so8 2500 units / tape & reel lp2951cd 5.0 or adj. 2.0 so8 98 units / rail lp2951cdr2 5.0 or adj. 2.0 so8 2500 units / tape & reel lp2951acd 5.0 or adj. 1.2 so8 98 units / rail lp2951acdr2 5.0 or adj. 1.2 so8 2500 units / tape & reel lp2951cdm3.0r2 3.0 or adj. 1.0 micro8 2500 units / tape & reel lp2951acdm3.0r2 3.0 or adj. 0.5 micro8 2500 units / tape & reel lp2951cdm3.3r2 3.3 or adj. 1.0 micro8 2500 units / tape & reel lp2951acdm3.3r2 3.3 or adj. 0.5 micro8 2500 units / tape & reel lp2951cdmr2 5.0 or adj. 2.0 micro8 2500 units / tape & reel lp2951acdmr2 5.0 or adj. 1.2 micro8 2500 units / tape & reel lp2951cn3.0 3.0 or adj. 1.0 dip8 50 units / rail lp2951acn3.0 3.0 or adj. 0.5 dip8 50 units / rail lp2951cn3.3 3.3 or adj. 1.0 dip8 50 units / rail lp2951acn3.3 3.3 or adj. 0.5 dip8 50 units / rail lp2951cn 5.0 or adj. 2.0 dip8 50 units / rail lp2951acn 5.0 or adj. 1.2 dip8 50 units / rail
lp2950, lp2951 http://onsemi.com 15 package dimensions to226aa/to92 z suffix plastic package case 2911 issue al 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 xx 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 dpak dt suffix plastic package case 369a13 issue ab d a k b r v s f l g 2 pl m 0.13 (0.005) t e c u j h t seating plane z dim min max min max millimeters inches a 0.235 0.250 5.97 6.35 b 0.250 0.265 6.35 6.73 c 0.086 0.094 2.19 2.38 d 0.027 0.035 0.69 0.88 e 0.033 0.040 0.84 1.01 f 0.037 0.047 0.94 1.19 g 0.180 bsc 4.58 bsc h 0.034 0.040 0.87 1.01 j 0.018 0.023 0.46 0.58 k 0.102 0.114 2.60 2.89 l 0.090 bsc 2.29 bsc r 0.175 0.215 4.45 5.46 s 0.020 0.050 0.51 1.27 u 0.020 --- 0.51 --- v 0.030 0.050 0.77 1.27 z 0.138 --- 3.51 --- notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: inch. 123 4
lp2950, lp2951 http://onsemi.com 16 package dimensions pdip8 n suffix plastic package case 62605 issue l notes: 1. dimension l to center of lead when formed parallel. 2. package contour optional (round or square corners). 3. dimensioning and tolerancing per ansi y14.5m, 1982. 14 5 8 f note 2 a b t seating plane h j g d k n c l m m a m 0.13 (0.005) b m t dim min max min max inches millimeters a 9.40 10.16 0.370 0.400 b 6.10 6.60 0.240 0.260 c 3.94 4.45 0.155 0.175 d 0.38 0.51 0.015 0.020 f 1.02 1.78 0.040 0.070 g 2.54 bsc 0.100 bsc h 0.76 1.27 0.030 0.050 j 0.20 0.30 0.008 0.012 k 2.92 3.43 0.115 0.135 l 7.62 bsc 0.300 bsc m --- 10 --- 10 n 0.76 1.01 0.030 0.040 so8 d suffix plastic package case 75107 issue w 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. 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
lp2950, lp2951 http://onsemi.com 17 package dimensions micro8 dm suffix plastic package case 846a02 issue e s b m 0.08 (0.003) a s t dim min max min max inches millimeters a 2.90 3.10 0.114 0.122 b 2.90 3.10 0.114 0.122 c --- 1.10 --- 0.043 d 0.25 0.40 0.010 0.016 g 0.65 bsc 0.026 bsc h 0.05 0.15 0.002 0.006 j 0.13 0.23 0.005 0.009 k 4.75 5.05 0.187 0.199 l 0.40 0.70 0.016 0.028 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. b a d k g pin 1 id 8 pl 0.038 (0.0015) t seating plane c h j l
lp2950, lp2951 http://onsemi.com 18 notes
lp2950, lp2951 http://onsemi.com 19 notes
lp2950, lp2951 http://onsemi.com 20 on semiconductor and are trademarks of semiconductor components industries, llc (scillc). 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 specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. atypicalo parameters which may be provided in scill c data sheets and/or specifications can and do vary in different applications 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, affiliates, and distributors 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 unauthori zed 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. publication ordering information japan : on semiconductor, japan customer focus center 4321 nishigotanda, shinagawaku, tokyo, japan 1410031 phone : 81357402700 email : r14525@onsemi.com on semiconductor website : http://onsemi.com for additional information, please contact your local sales representative. lp2950/d literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 3036752175 or 8003443860 toll free usa/canada fax : 3036752176 or 8003443867 toll free usa/canada email : onlit@hibbertco.com n. american technical support : 8002829855 toll free usa/canada

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