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january 2009 rev 2 1/19 19 ld39150xx ultra low drop bicmos voltage regulator features 1.5 a guaranteed output current ultra low dropout voltage (200 mv typ. @ 1.5 a load, 40 mv typ. @ 300 ma load) very low quiescent current (1 ma typ. @ 1.5 a load, 1 a max @ 25 c in off mode) logic-controlled electronic shutdown current and therma l internal limit 1.5 % output voltage tolerance @ 25 c fixed and adj output voltages: 1.22 v, 1.8 v, 2.5 v, 3.3 v, adj. (see table 1 ) temperature range: -40 to 125 c fast dynamic response to line and load changes stable with ceramic capacitor (see section 7.1 , section 7.2 and section 7.3 ) available in ppak, dpak and dfn6 (3x3 mm) typical application microprocessor power supply dsps power supply post regulators fo r switching suppliers high efficiency linear regulator description the ld39150xx is a fast ultra low drop linear regulator which operates from 2.5 v to 6 v input supply. a wide range of output options are available. the low drop voltage, low noise, and ultra low quiescent current make it suitable for low voltage microprocessor and memory applications. the device is developed on a bicmos process which allows low quiescent current operation independently of output load current. dfn6 (3x3 mm) ppak dpak table 1. device summary part numbers order codes output voltages dpak (t&r) ppak (t&r) dfn (1) ld39150xx12 ld39150dt12-r ld39150pu12r 1.22 v ld39150xx18 ld39150dt18-r ld39150pt18-r ld39150pu18r 1.8 v ld39150xx25 ld39150dt25-r ld39150pt25-r ld39150pu25r 2.5 v ld39150xx33 ld39150dt33-r ld39150pt33-r ld39150pu33r 3.3 v ld39150xx ld39150pt-r LD39150PU-R adj from 1.22 to 5.0 v 1. available on request. www.st.com
contents ld39150xx 2/19 contents 1 diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 typical application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6 typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7 application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7.1 external capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7.2 input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7.3 output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7.4 thermal note . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7.5 inhibit input operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 8 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 9 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
ld39150xx diagram 3/19 1 diagram (*) not present on adj versions. figure 1. block diagram
pin configuration ld39150xx 4/19 2 pin configuration figure 2. pin connections (top view for dpak and ppak, bottom view for dfn) dfn6 (3x3 mm) dpak ppak table 2. pin description pin n symbol note dfn p pak dpak 55 v sense /n.c. for fixed versions: to be connected with ldo output voltage pins for dfn package and not connected on ppak adj for adjustable version: error amplifier input pin for v o from 1.22 to 5.0 v 321 v i ldo input voltage; v i from 2.5 v to 6 v, c i = 1 f must be located at a distance of not more than 0.5?? from input pin. 443 v o ldo output voltage pins, with minimum c o = 2.2 f needed for stability (also refer to c o vs esr stability chart) 21 v inh inhibit input voltage: on mode when v inh 2 v, off mode when v inh 0.3 v (do not leave floating, not internally pulled down/up) 1 3 2 gnd common ground 6 n.c. not connected
ld39150xx typical application circuits 5/19 3 typical application circuits (c i and c o capacitors must be placed as cl ose as possible to the ic pins) note: inhibit pin is not internally pulled down/up then it must not be left floating. disable the device when connected to gnd or to a positive voltage less than 0.3 v. note: set r2 as close as possible to 4.7 k figure 3. ld39150xx fixe d version with inhibit figure 4. ld39150xx adjustable version v o = v ref (1 + r 1 /r 2 )
typical application circuits ld39150xx 6/19 figure 5. ld39150xx dpak figure 6. timing diagram
ld39150xx maximum ratings 7/19 4 maximum ratings note: absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these conditions is not implied. all values are referred to gnd. table 3. absolute maximum ratings symbol parameter value unit v i dc input voltage -0.3 to 6.5 v v inh inhibit input voltage -0.3 to v i +0.3 (6.5 v max) v v o dc output voltage -0.3 to v i +0.3 (6.5 v max) v v adj adj pin voltage -0.3 to v i +0.3 (6.5 v max) v i o output current internally limited ma p d power dissipation internally limited mw t stg storage temperature range -50 to 150 c t op operating junction temperature range -40 to 125 c table 4. thermal data symbol parameter ppak dpak dfn (1) unit r thja thermal resistance junction-ambient 100 100 40 c/w r thjc thermal resistance junction-case 8 8 10 c/w 1. with pcb ground plane heatsink.
electrical characteristics ld39150xx 8/19 5 electrical characteristics table 5. electrical characteristics (t j = 25 c, v i = v o +1 v, c i = 1 f, c o = 2.2 f, i load = 10 ma, v inh = 2 v, unless otherwise specified) symbol parameter parameter min. typ. max. unit v i operating input voltage 2.5 6 v v o output voltage tolerance v i = v o +1v, i load = 10ma to 1.5a -1.5 1.5 % of v o(nom) v i = v o +1v to 6v, i load = 10ma to 1.5a t j = -40 to 125c -3 3 v ref reference voltage 1.22 v v o output voltage line regulation v i = v o +1v to 6v 0.04 % v i = v o +1v to 6v, t j = -40 to 125c 0.1 0.2 % v o / i load output voltage load regulation i load = 10ma to 1.5a 0.06 %/a i load = 10ma to 1.5a, t j = -40 to 125c 0.2 0.4 v drop dropout voltage (v i - v o ) i load = 300ma, t j =-40 to 125c 40 80 mv i load = 1.5a, t j = -40 to 125c 200 400 i q quiescent current: on mode i load = 10ma to 1.5a, v inh = 2v t j = -40 to 125c 12.5ma quiescent current: off mode v inh = 0.3v 1 a v inh = 0.3v, t j = -40 to 125c 5 short circuit protection i sc short circuit protection r l = 0 3 a inhibit input v inh inhibit threshold low v i = 2.5 to 6v off t j = -40 to 125c 0.3 v inhibit threshold high 2 t d-off current limit i load = 1.5a, v o = 3.3v 15 s t d-on current limit i load = 1.5a, v o = 3.3v 15 i inh inhibit input current (1) 1. guaranteed by design v i = 6v, v inh = 0 to 6v 0.1 1a ac parameters svr supply voltage rejection v i = 4.5 1v, v o = 3.3v, i load = 10ma, f = 120hz 65 db f = 1khz 55 e n output noise voltage b w = 10hz to 100khz, c o = 2.2f, v o = 2.5v 100 v rms t shdn thermal shutdown off 170 c hysteresis 10
ld39150xx typical performance characteristics 9/19 6 typical performance characteristics (t j = 25 c, v i = v o + 1 v, c i = 1 f, c o = 2.2 f, i load = 10 ma, v inh = v i , unless otherwise specified) figure 7. output voltage vs temperature figure 8. dropout voltage vs temperature figure 9. dropout voltage vs output current figure 10. quiescent current vs supply voltage figure 11. quiescent current vs temperature figure 12. quiescent current vs temperature
typical performance characteristics ld39150xx 10/19 figure 13. short circuit current vs temperatur e figure 14. output voltage vs input voltage figure 15. stability region vs c o & esr (at 100 khz) figure 16. stability region vs c o & low esr (at 100 khz) figure 17. load transient f igure 18. line transient v i = 3.5v, i o = 10ma to 1.5a, c i = 1f, c o = 2.2f v i = 3.5v to 5.5v, i load = 10ma, c o = 2.2f
ld39150xx application notes 11/19 7 application notes 7.1 external capacitors the ld39150xx requires external capacitors for regulator stabilit y. these capacitors must be selected to meet the requirements of minimum capacitance and equivalent series resistance (see figure 15 and figure 16 ). the input/output capacitors must be located less than 1cm from the relative pins and connected directly to the input/output ground pins using traces which have no other currents flowing through them. any good quality of ceramic or electrolytic capacitors can be used. 7.2 input capacitor an input capacitor whose minimum value is 1 f is required with the ld39150xx (amount of capacitance can be increased without limit). this capacitor must be located a distance of not more than 1cm from the input pin of the device and returned to a clean analog ground. any good quality ceramic, tantalum or film capacitors can be used for this capacitor. 7.3 output capacitor it is possible to use ceramic or tantalum capacitors but the output capacitor must meet the requirement for minimum amount of capacitance and esr (equivalent series resistance) value. a minimum capacitance of 2.2 f is a good choice to guarant ee the stability of the regulator. anyway, other c o values can be used according to the ( figure 15 and figure 16 ) showing the allowable esr range as a function of the output capacitance. this curve represents the stability region over the full te mperature and i o range. 7.4 thermal note the output capacitor must maintain its esr in the stable region over the full operating temperature range to assure stability. also , capacitors toleranc e and variation with temperature must be kept in consideration in order to assure the minimum amount of capacitance at all times. 7.5 inhibit input operation the inhibit pin can be used to turn off the regulator when pulled down, so drastically reducing the current consumption down to less than 1 a. when the inhibit feature is not used, this pin must be tied to v i to keep the regulator output on at all times. to assure proper operation, the signal source used to drive the inhibit pin must be able to swing above and below the specified thresholds listed in the electrical characteristics section (v ih v il ). the inhibit pin must not be left floating because it is not internally pulled down/up.
package mechanical data ld39150xx 12/19 8 package mechanical data in order to meet environmental requirements, st offers these devices in different grades of ecopack? packages, depending on their level of environmental compliance. ecopack? specifications, grade definitions and product status are available at: www.st.com. ecopack? is an st trademark.
ld39150xx package mechanical data 13/19 dim. mm. inch. min. typ. max. min. typ. max. a 2.2 2.4 0.0 8 6 0.0 9 4 a1 0. 9 1.1 0.0 3 5 0.04 3 a2 0.0 3 0.2 3 0.001 0.00 9 b 0.4 0.6 0.015 0.02 3 b2 5.2 5.4 0.204 0.212 c 0.45 0.6 0.017 0.02 3 c2 0.4 8 0.6 0.01 9 0.02 3 d 6 6.2 0.2 3 6 0.244 d1 5.1 0.201 e 6.4 6.6 0.252 0.260 e1 4.7 0.1 8 5 e 1.27 0.050 g4. 9 5.25 0.1 93 0.206 g1 2. 38 2.7 0.0 93 0.106 h 9 . 3 5 10.1 0. 3 6 8 0. 39 7 l2 0. 8 1 0.0 3 1 0.0 39 l4 0.6 1 0.02 3 0.0 39 l5 1 0.0 39 l6 2. 8 0.110 ppak mechanical data 007 8 1 8 0-e
package mechanical data ld39150xx 14/19 dim. mm. inch. min. typ. max. min. typ. max. a 2.2 2.4 0.0 8 6 0.0 9 4 a1 0. 9 1.1 0.0 3 5 0.04 3 a2 0.0 3 0.2 3 0.001 0.00 9 b 0.64 0. 9 0.025 0.0 3 5 b 4 5.2 5.4 0.204 0.212 c 0.45 0.6 0.017 0.02 3 c2 0.4 8 0.6 0.01 9 0.02 3 d 6 6.2 0.2 3 6 0.244 d1 5.1 0.200 e 6.4 6.6 0.252 0.260 e1 4.7 0.1 8 5 e2.2 8 0.0 9 0 e1 4.4 4.6 0.17 3 0.1 8 1 h 9 . 3 5 10.1 0. 3 6 8 0. 39 7 l 1 0.0 39 (l1) 2. 8 0.110 l2 0. 8 0.0 3 1 l4 0.6 1 0.02 3 0.0 39 r 0.2 0.00 8 v2 0 8 0 8 dpak mechanical data 006 8 772-f
ld39150xx package mechanical data 15/19 dim. mm. inch. min. typ. max. min. typ. max. a0. 8 00. 9 0 1.00 0.0 3 1 0.0 3 5 0.0 39 a1 0 0.02 0.05 0 0.001 0.002 a 3 0.20 0.00 8 b 0.2 3 0. 3 00. 38 0.00 9 0.012 0.015 d2. 9 0 3 .00 3 .10 0.114 0.11 8 0.122 d2 2.2 3 2. 38 2.4 8 0.0 88 0.0 9 4 0.0 98 e2. 9 0 3 .00 3 .10 0.114 0.11 8 0.122 e2 1.50 1.65 1.75 0.05 9 0.065 0.06 9 e0. 9 50.0 3 7 l0. 3 0 0.40 0.50 0.012 0.016 0.020 dfn6 ( 3 x 3 mm) mechanical data 7 9 466 3 7a
package mechanical data ld39150xx 16/19 dim. mm. inch. min. typ. max. min. typ. max. a 33 0 12. 99 2 c12. 8 1 3 .0 1 3 .2 0.504 0.512 0.51 9 d 20.2 0.7 9 5 n60 2. 3 62 t22.40. 88 2 ao 6. 8 06. 9 0 7.00 0.26 8 0.272 0.2.76 bo 10.40 10.50 10.60 0.40 9 0.41 3 0.417 ko 2.55 2.65 2.75 0.100 0.104 0.105 po 3 . 9 4.0 4.1 0.15 3 0.157 0.161 p7. 98 .0 8 .1 0. 3 11 0. 3 15 0. 3 1 9 tape & reel dpak-ppak mechanical data
ld39150xx package mechanical data 17/19 dim. mm. inch. min. typ. max. min. typ. max. a1 8 0 7.0 8 7 c 12. 8 1 3 .2 0.504 0.51 9 d 20.2 0.7 9 5 n60 2. 3 62 t 14.4 0.567 ao 3 . 3 0.1 3 0 bo 3 . 3 0.1 3 0 ko 1.1 0.04 3 po 4 0.157 p 8 0. 3 15 tape & reel qfnxx/dfnxx ( 3 x 3 ) mechanical data
revision history ld39150xx 18/19 9 revision history table 6. document revision history date revision changes 26-jan-2007 1 initial release. 12-jan-2009 2 removed: package dfn8 (4x4 mm) and added package dfn6 (3x3 mm).
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