1 rev. 5/19/03 SP78LC00 100ma cmos ldo regulator ?copyright 2003 sipex corporation low dropout voltage, 160mv @ 100ma high output voltage accuracy, 2% guaranteed 100ma output ultra low shutdown current, 1 a max ultra low gnd current ?110 a @ 100ma load ?28 a @ 100 a load fast transient response 78db psrr @ 100hz 40db psrr @ 400khz extremely tight load and line regulation very low temperature coefficient current and thermal limiting unconditionally stable with 1 f ceramic 5 pin sot-23 package fixed 3.0v output 100ma replacement for 50ma mc78lc micropower, 100ma cmos ldo regulator SP78LC00 description features the SP78LC00 is a cmos ldo designed to meet a broad range of applications that require accuracy, speed and ease of use. this ldo offers extremely low quiescent current which only increases slightly under load, thus providing advantages in ground current performance over bipolar ldos. the ldo handles an extremely wide load range and guarantees stability with a 1 f ceramic output capacitor. it has excellent low frequency psrr, not found in other cmos ldos and thus offer exceptional line regulation. high frequency psrr is better than 40db up to 400khz. load regulation is excellent and temperature stability is comparable to bipolar ldos. the SP78LC00 is available in fixed 3.0v output voltage version in a small sot-23-5 package. 3 2 1 SP78LC00 v out v in 1 f ceramic 1 f ceramic 2 3 1 4 5 nc nc out in gnd SP78LC00 mobile phone data cables laptop, notebook and palmtop computers battery-powered equipment consumer/ personal electronics smps post-regulator dc-to-dc modules medical devices data cable pagers applications typical application diagram
2 rev. 5/19/03 SP78LC00 100ma cmos ldo regulator ?copyright 2003 sipex corporation electrical specifications supply input voltage (v in ) ............................ -2v to 7v output voltage (v out ) ......................... -0.6 to (v in +1v) enable input voltage (v en ). .......................... -2v to 7v power dissipation (p d ) ......... internally limited, note 3 lead temperature (solderi ng 5s). ...................... 260 c s torage temperature ......................... -65?c to +150?c input voltage (v in ) ................................. +2.5v to +6v enable input voltage (v en ) ......................... 0v to +6v v in = v out +1v, i l = 100 a, c in = 1.0 f, c out = 1.0 f, t j = 25 c , bold values indicate -40 c t j 125 c unless otherwise noted. parameter conditions min typ max units output voltage accuracy, (v out )v ariation from specified v out -2 2 % - 33 % output voltage temperature 60 ppm/ c coefficient, note 4 , ( ? v out / ? t) line regulation, ( ? v out / v out )v in = (v out + 1v) to 6v 0.03 0.2 %/v load regulation, note 5 ,i l = 0.1ma to 100ma, 0.07 0.25 % ( ? v out / v out ) dropout voltage, note 6 ,i l = 100 a0.24mv (v in ?v out ) 7 mv i l = 50ma 70 120 mv 160 mv i l = 100ma 160 250 mv 300 mv ground pin current, note 7 ,i l = 100 a2845 a (i gnd ) 50 a i l = 50ma 60 120 150 a i l = 100ma 110 200 a 250 a power supply rejection ratio, frequency = 100hz, i l = 10ma 78 db (psrr) frequency = 400khz, i l = 10ma 40 db current limit, (i cl )v out = 0v 100 150 200 ma thermal limit regulator turns off 162 c regulator turns on 147 c thermal regulation, note 8 ,0.05%/w ( ? v out / ? p d ) absolute maximum ratings these are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. exposure to absolute maximum rating conditions for extended periods of time may affect reliability. operating ratings junction temperature (t j ) .............. -40?c to +125?c thermal resistance, sot-23-5 ( ja ) ............. note 3
3 rev. 5/19/03 SP78LC00 100ma cmos ldo regulator ?copyright 2003 sipex corporation note 1. exceeding the absolute maximum rating may damage the device. note 2. the device is not guaranteed to function outside its operating rating. note 3. the maximum allowable power dissipation at any t a (ambient temperature) is p d (max) = (t j (max) ?t a ) / q ja . exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. the q ja of the SP78LC00 (all versions) is 220 c/w mounted on a pc board with minimum copper area (see ?hermal considerations?section for further details). note 4. output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. note 5. load regulation is measured at constant junction temperature using low duty cycle pulse testing. parts are tested for load regulation in the load range; from 0.1ma to 100ma. changes in output voltage due to heating effects are covered by the thermal regulation specification. note 6. dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1v differential. note 7. ground pin current is the regulator quiescent current. the total current drawn from the supply is the sum of the load current plus the ground pin current. note 8. thermal regulation is defined as the change in output voltage at a time ??after a change in power dissipation is applied, excluding load or line regulation effects. specifications are for a 100ma load pulse at v in = 6v for t = 10ms. electrical specifications: continued v in = v out +1v, i l = 100 a, c in = 1.0 f, c out = 1.0 f, t j = 25 c , bold values indicate -40 c t j 125 c unless otherwise noted. pin number name function 1 gnd ground 2i ns upply input voltage 3o ut regulator output voltage 4,5 nc no connection pin assignments functional diagram v in current limit + - v ref 1.25v 1.20v bandgap ref and thermal shutdown gnd r1 out in r2 c out v out c in
4 rev. 5/19/03 SP78LC00 100ma cmos ldo regulator ?copyright 2003 sipex corporation general overview the SP78LC00 is a cmos ldo designed to meet a broad range of applications that re- quire accuracy, speed and ease of use. this ldo offers extremely low quiescent current which only increases slightly under load, thus providing advantages in ground current per- formance over bipolar ldos. the ldo handles an extremely wide load range and guarantee stability with a 1 f ceramic output capacitor. it has excellent low frequency psrr, not found in other cmos ldos and thus offer exceptional line regulation. high frequency psrr is better than 40db up to 400khz. load regulation is excellent and temperature stability is comparable to bipolar ldos. thus, overall system accuracy is main- tained under all dc and ac conditions. cur- rent limit and thermal protection is provided internally and is well controlled. architecture the SP78LC00 has a current limit of 150ma. the ldo has a two stage amplifier which handles an extremely wide load range (10 a to 100ma) and guarantees stability with a 1 f ceramic load capacitor. the ldo ampli- fier has excellent gain and thus touts psrr performance not found in other cmos ldos. the amplifier guarantees no overshoot on power up. the amplifier also contains an ac- tive pull down, so that when the load is re- moved quickly the output voltage transient is minimal; thus output deviation due to load transient is small and fairly well matched when connecting and disconnecting the load. an accurate 1.250v bandgap reference is bootstrapped to the output. this increases both the low frequency and high frequency psrr. unlike many ldos, the bandgap ref- erence is not brought out for filtering by the user. this tradeoff was maid to maintain good psrr at high frequency (psrr can be de- graded in a system due to switching noise coupling into this pin). also, often leakages of the bypass capacitor or other components cause an error on this high impedance bandgap node. thus, this tradeoff has been made with "ease of use" in mind. protection current limit behavior is very well controlled, providing less than 10% variation in the cur- rent limit threshold over the entire tempera- ture range of the SP78LC00. the SP78LC00 has a current limit of 150ma. thermal shut- down activates at 162 c and deactivates at 147 c. thermal shutdown is very repeatable with only a 2 to 3 degree variation from device to device. thermal shutdown changes by only 1 to 2 degrees with vin change from 4v to 7v. input capacitor a small capacitor, 1 f or higher, is required from v in to gnd to create a high frequency bypass for the ldo amplifier. any ceramic or tantalum capacitor may be used at the input. capacitor esr (effective series resistance) should be smaller than 3 ? . output capacitor an output capacitor is required between v out and gnd to prevent oscillation. a capaci- tance as low as 0.22 f can fulfill stability requirements in most applications. a 1 f capacitor will ensure unconditional stability from no load to full load over the entire input voltage, output voltage and temperature range. larger capacitor values improve the regulator's transient response. the output capacitor value may be increased without limit. the output capacitor should have an esr (effective se- ries resistance) below 5 ? and a resonant fre- quency above 1mhz. no load stability the SP78LC00 will remain stable and in regu- lation with no external load (other than the internal voltage driver) unlike many other voltage regulators. this is especially impor- tant in cmos ram keep-alive applications. thermal considerations the SP78LC00 is designed to provide 100ma of continuous current. maximum power dissi- pation can be calculated based on the output current and the voltage drop across the part. to determine the maximum power dissipa- theory of operation
5 rev. 5/19/03 SP78LC00 100ma cmos ldo regulator ?copyright 2003 sipex corporation theory of operation: continued tion in the package, use the junction-to-ambi- ent thermal resistance of the device and the following basic equation: p d = (t j(max) - t a ) ja t j(max) is the maximum junction temperature of the die and is 125 c. t a is the ambient operating. ja is the junction-to-ambient ther- mal resistance for the regulator and is layout dependent. the actual power dissipation of the regulator circuit can be determined using one simple equation: p d = (v in - v out )*i out + v in *i gnd ? (v in - v out ) * i out substituting p d(max) for p d and solving for the operating conditions that are critical to the application will give the maximum operating conditions for the regulator circuit. for ex- ample, if we are operating the SP78LC00- 3.0v at room temperature, with a minimum footprint layout, we can determine the maxi- mum input voltage for a set output current. p d(max) = (125 c -25 c) = 454mw (220 c/w) to prevent the device from entering thermal shutdown, maximum power dissipation can not be exceeded. using the output voltage of 3.0v and an output current of 100 ma, the maximum input voltage can be determined. ground pin current can be taken from the electrical spec?- table (i gnd =110 a at i out =100ma). the maximum input voltage is determined as follows: 454mw = (v in ?3.0v)*100ma + v in *0.11ma solving for v in , we get: v in = (454mw + 300mw) 100.11ma after calculations, we find that the maximum input voltage of a 3.0v application at 100ma of output current in an sot-23-5 package is7.53v. dual-supply operation when used in dual supply systems where the regulator load is returned to a negative sup- ply, the output voltage must be diode clamped to ground. dropout vs. io ( fixed 3.0v) 0 50 100 150 200 250 300 350 400 050 100 150 200 io (ma) dropout (mv) t=125 t=27 t=-40 dropout vs. temp (fixed 3.0v) 0 50 100 150 200 250 -50 -20 10 40 70 100 130 te mp (deg) dropout (mv) i out =100ma i out =50ma typical characteristics 27 c, v in = 5.5v, i o = 0.1ma, c in = c out = 1 f unless otherwise specified.
6 rev. 5/19/03 SP78LC00 100ma cmos ldo regulator ?copyright 2003 sipex corporation typical characteristics 27 c, v in = 5.5v, i o = 0.1ma, c in = c out = 1 f unless otherwise specified. dropout vs. temp (fixed 3.0v) 0.0 0.5 1.0 1.5 2.0 2.5 -50 -20 10 40 70 100 130 te mp (deg) dropout (mv) io=1ma io=0.1ma iq vs. vin (fixed 3.0v, 0 5 10 15 20 25 30 35 40 45 50 01234567 vin (v) iq (ua) v out vs. temp (fixed 3.0v) 2.97 2.98 2.99 3.00 3.01 3.02 3.03 -50 -20 10 40 70 100 130 te mp (deg) v out (v) vin = 7v vin = 4v ignd vs. io (fixed 3.0v) 20 45 70 95 120 145 170 195 220 050 100 150 200 io (ma) ignd (ua) vin = 7v vin = 5.5v vin = 4v iq vs. temp (fixed 3.0v, io=0ua) temp (deg) iq (ua) vin = 7v vin =5.5v vin = 4v 25 30 35 40 45 50 -50 -20 10 40 70 100 130 ignd vs. vin (fixed 3.0v) 34567 vin (v) ignd (ua) 0 50 100 150 200 250 i out =50ma i out =0.1ma i out =100ma
7 rev. 5/19/03 SP78LC00 100ma cmos ldo regulator ?copyright 2003 sipex corporation typical characteristics: continued 27 c, v in = 5.5v, i o = 0.1ma, c in = c out = 1 f unless otherwise specified. current limit vs. temp (fixed 3.0v, vin=4v) 100 150 200 -50 0 50 100 150 te mp (deg) icl (ma) 3.0v fixed load regulation (fixed 3.0v) 2.992 2.994 2.996 2.998 3.000 3.002 3.004 050 100 150 200 250 300 io (ma) v out (v) vin = 7v vin = 5.5v vin = 4v 3.0 v out fixed v in = 7v, i out = 100ma c in = c out = 1 f cer. cap t r = t f = 100ns i out 100 a 80ma 60ma 40ma 20ma 0ma -20ma -40ma 100ma 0ma load transient response, 100ma step, 7v in 3.0 v out fixed v in = 4v, i out = 100ma c in = c out = 1 f cer. cap t r = t f = 100ns i out 100 a 80ma 60ma 40ma 20ma 0ma -20ma -40ma 100ma 0ma load transient response, 100ma step, 4v in line regulation (fixed 3.0v) 2.994 2.996 2.998 3.000 3.002 3.004 3.006 34567 vin (v) io=0.1ma io=1ma io=50ma io=100ma
8 rev. 5/19/03 SP78LC00 100ma cmos ldo regulator ?copyright 2003 sipex corporation (db) i out = 10ma c out = 2.2 f frequency (hz) 0 -20 -40 -60 -80 -100 10 100 1k 10k 100k 1m 10m po wer supply rejection ratio ref level /div 0.000db 10.000db start 10.000hz stop 10 000 000.000hz (db) i out = 1ma c out = 2.2 f frequency (hz) 0 -20 -40 -60 -80 -100 10 100 1k 10k 100k 1m 10m po wer supply rejection ratio ref level /div 0.000db 10.000db start 10.000hz stop 10 000 000.000hz po wer supply rejection ratio (db) i out = 100ma c out = 2.2 f frequency (hz) 0 -20 -40 -60 -80 -100 10 100 1k 10k 100k 1m 10m ref level /div 0.000db 10.000db start 10.000hz stop 10 000 000.000hz typical characteristics: continued 27 c, v in = 5.5v, i o = 0.1ma, c in = c out = 1 f unless otherwise specified. (db) i out = 100 a c out = 1 f v in = 4v v out = 3v frequency (hz) 0 -20 -40 -60 -80 -100 10 100 1k 10k 100k 1m 10m po wer supply rejection ratio ref level /div 0.000db 10.000db start 10.000hz stop 10 000 000.000hz
9 rev. 5/19/03 SP78LC00 100ma cmos ldo regulator ?copyright 2003 sipex corporation symbol a a1 a2 b c d e e1 l e e1 a 1.45 / (36.83) 0.15 / (3.81) 1.30 / (33.02) 0.50 / (12.7) 0.20 / (5.08) 3.10 / (78.74) 3.00 / (76.2) 1.75 / (38.1) 0.55 10 o 0.90 / (22.86) 0.00 / (0.00) 0.90 / (22.86) 0.25 / (6.35) 0.09 / (2.286) 2.80 / (71.12) 2.60 / (66.04) 1.50 / (38.1) 0.35 / (8.89) 0 o min inch / mm 0.95ref / (24.13) 1.90ref / (48.26) e a e c l b e1 d c l a2 a1 a a .10 c l e1 l 2 0.20/(5.08) datum 'a ' c a max inch / mm package: 5 pin sot-23
10 rev. 5/19/03 SP78LC00 100ma cmos ldo regulator ?copyright 2003 sipex corporation ordering information part number topmark temperature range package type sp78lc30em5 ..................... t1 ......................... -40?c to +125?c ............................... sot-23-5 sp78lc30em5/tr ............... t1 ......................... -40?c to +125?c ....... (tape & reel) sot-23-5 signal processing excellence sipex corporation reserves the right to make changes to any products described herein. sipex does not assume any liability aris ing out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor t he rights of others. corporation sipex corporation headquarters and sales office 233 south hillview drive milpitas, ca 95035 tel: (408) 934-7500 fax: (408) 935-7600 sales office 22 linnell circle billerica, ma 01821 tel: (978) 667-8700 fax: (978) 670-9001 e-mail: sales@sipex.com
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