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this is information on a product in full production. december 2013 docid025502 rev 1 1/34 ldf 1 a very low drop voltage regulator datasheet - production data features ? input voltage from 2.6 to 16 v ? very low-dropout voltage (500 mv max. at 1 a load) ? low quiescent current (200 a typ. @ 1 a load) ? available in 1% precision in ppak and dfn6 packages, 2% in dpak ? 1 a guaranteed output current ? wide range of output voltages available on request: adjustable from 0.8 v, fixed up to 12 v in 100 mv steps ? logic-controlled electronic shutdown ? power good (ppak and dfn packages) ? fast dynamic response to line and load changes ? internal current and thermal protections ? temperature range: -40 c to 125 c applications ? computer and laptop ? battery-powered equipments ? industrial and medical equipment ? consumer and set-top box description the ldf is a fast, very low drop linear regulator which operates from an input supply voltage in the range of 2.6 v to 16 v. it is available in fixed and adjustable output voltage versions, from 0.8 v to 12 v. the ldf features are: high output precision, very low-dropout voltage, low noise, and low quiescent current, therefore suitable for low voltage microprocessors and memory applications. enable logic control pin and power-good output are featured on ppak/dfn packages. current and thermal protection are provided. 33$. '3$. ') 1[ ')1[ www.st.com
contents ldf 2/34 docid025502 rev 1 contents 1 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6.1 external capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 6.1.1 input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6.1.2 output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6.2 enable pin operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 6.3 power good . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 7 typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 8 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 9 packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 10 order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 11 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
docid025502 rev 1 3/34 ldf block diagram 34 1 block diagram figure 1. block diagram (generic version) $09
pin configuration ldf 4/34 docid025502 rev 1 2 pin configuration figure 2. pin connection (top view) $09 7$% 7$% '3$. 33$. ')1 table 1. dpak, ppak pin description pin n symbol function ppak dpak 5 - adj/pg for adjustable versions: error amplifier input pin for fixed versions: power-good output 21v in input voltage 43v out output voltage 1 - en enable pin logic input: low = shutdown, high = active 32gndground tab tab gnd ground table 2. dfn6-2x2 and 3x3 pin description pin n symbol function 2adj/nc for adjustable versions: error amplifier input pin for fixed versions: not connected 6v in input voltage 1v out output voltage 5 en enable pin logic input: low = shutdown, high = active 3 pg power-good output 4 gnd ground exposed pad gnd ground
docid025502 rev 1 5/34 ldf typical application 34 3 typical application figure 3. fixed versions figure 4. adjustable versions (ppak and dfn6 packages only) $09 33$.dqg')1sdfndjhv '3$.sdfndjh 2)) 21 9 , ?) ?) (1 ,1387 287387 3* *1' 9 2 9 , ?) ?) ,1387 287387 *1' 9 2 $09 33$.sdfndjh ')1sdfndjhv 2)) 21 9 , ?) ?) (1 ,1387 287387 *1' 9 2 $'- 5 5 2)) 21 9 , ?) ?) (1 ,1387 287387 *1' 9 2 $'- 5 5 9 r 9 5() 5 5 3* 9 r 9 5() 5 5
absolute maximum ratings ldf 6/34 docid025502 rev 1 4 absolute 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 in dc input voltage - 0.3 to 20 v v out dc output voltage - 0.3 to v in + 0.3 v v en enable input voltage - 0.3 to v in + 0.3 v v adj adjust pin voltage - 0.3 to 2 v v pg pg pin voltage - 0.3 to v in + 0.3 v i load output current internally limited ma p d power dissipation internally limited mw t stg storage temperature range - 65 to 150 c t op operating junction temperature range - 40 to 125 c table 4. thermal data symbol parameter value unit ppak dpak dfn6-2x2 dfn6-3x3 r thja thermal resistance junction-ambient 100 100 65 55 c/w r thjc thermal resistance junction-case 8 8 6.5 10 c/w
docid025502 rev 1 7/34 ldf electrical characteristics 34 5 electrical characteristics t j = 25 c, v in = v out(nom) + 1 v (1) , c in = 1 f, c out = 2.2 f, i load = 10 ma, v en = 2 v, unless otherwise specified. table 5. ldf (fixed versions) electrical characteristics symbol parameter test conditions min. typ. max. unit v in operating input voltage 2.6 16 v v out v out accuracy, ppak and dfn6 versions v out +1 v (1) v in 16 v i load = 10 ma -1 1 % 10 ma i load 1 a t j = -40 to 125 c -1.5 1.5 % v out v out accuracy, dpak version v out +1 v (1) v in 16 v i load = 10 ma -2 2 % 10 ma i load 1 a t j = -40 to 125 c -3 3 % v out static line regulation v out +1 v (1) v in 16 v 0.01 %/v v out +1 v (1) v in 16 v, t j = -40 to 125 c 0.04 v out static load regulation 10 ma i load 1 a 0.2 %/a 10 ma i load 1 a, t j = -40 to 125 c 0.6 v drop dropout voltage (2) i load = 1 a, -40 c3 v 1.5 a v en enable input logic low v in = 2.6 v to 16 v, -40 c electrical characteristics ldf 8/34 docid025502 rev 1 svr supply voltage rejection v in = 4.5 +/- 0.5 v ripple frequency = 120 hz, v out = 3.3 v 60 db v in = 4.5 +/- 0.5 v ripple frequency = 120 hz to 100k hz v out = 3.3 v 45 e n output noise voltage bw = 10 hz to 100 khz, i load = 100 ma c out = 2.2 f 45 v rms /v out t shdn thermal shutdown 170 c hysteresis 10 1. for v out <1.6 v; v in = 2.6 v 2. dropout voltage is the input-to-output voltage difference at wh ich the output voltage is 100 mv below its nominal value. this specification does not apply to output voltages below 1.6 v table 5. ldf (fixed versions) electrical characteristics (continued) symbol parameter test conditions min. typ. max. unit
docid025502 rev 1 9/34 ldf electrical characteristics 34 t j = 25 c, v in = v out(nom) + 1 v (1) , c in = 1 f, c out = 2.2 f, i load = 10 ma, v en = 2 v, unless otherwise specified. table 6. ldf (adjustable version) electrical characteristics symbol parameter test conditions min. typ. max. unit v in operating input voltage 2.6 16 v v adj reference voltage v in = v out +1 v (1) 0.8 v reference voltage tolerance v out +1 v (1) v in 16 v i load = 10 ma -1 1 % 10 ma i load 1 a t j = -40 to 125 c -1.5 1.5 v out static line regulation v out +1 v (1) v in 16 v 0.01 %/v v out +1v (1) v in 16 v, t j = -40 to 125 c 0.04 v out static load regulation 10 ma i load 1 a 0.2 %/a 10 ma i load 1 a, t j = -40 to 125 c 0.2 0.6 v drop dropout voltage (2) v out fixed to 2.5 v, i load = 1 a, -40 c3 v 1.5 a v en enable input logic low v in = 2.6 v to 16 v, -40 c electrical characteristics ldf 10/34 docid025502 rev 1 e n output noise voltage b w = 10 hz to 100 khz, i load = 100 ma c out = 2.2 f 50 v rms /v out t shdn thermal shutdown 170 c hysteresis 10 1. for v out <1.6 v; v in = 2.6 v 2. dropout voltage is the input-to-output voltage difference at whic h the output voltage is 100 mv below its nominal value. this specification does not apply to output voltages below 1.6 v table 6. ldf (adjustable version) electrical characteristics symbol parameter test conditions min. typ. max. unit
docid025502 rev 1 11/34 ldf application information 34 6 application information 6.1 external capacitors the ldf voltage regulator requires external ceramic capacitors to assure the control loop stability. these capacitors must be selected to meet the requirements of minimum capacitance and equivalent series resistance (see figures 25, 26 ). input/output capacitors should be located as closer as possible to the relative pins. 6.1.1 input capacitor an input capacitor, whose minimum value is 1 f, must not be located farther than 0.5" from the input pin of the device and returned to a clean analog ground. 6.1.2 output capacitor ceramic capacitors could be used on the output, provided that they must meet the minimum amount of capacitance and e.s.r. (equivalent series resistance) value required. 2.2 f is suggested as minimum capacitance to guarantee the stability of the regulator. anyway, other c out values can be used according to the figures 25, 26 showing the allowable esr range as a function of the output capacitance. the output capacitor must maintain its esr in the stable region over the full operating temperature range to assure stability. besides, capacitor tolerance and temperature variation must be taken into account to assure the minimum amount of capacitance. 6.2 enable pin operation this pin can be used to turn off the regulator when it is pulled down, so to drastically reduce the current consumption. when the enable feature is not used, this pin must be tied to v in to keep the regulator output in on state every time. to assure the proper operation, the signal source, used to drive the en pin, must be able to swing above and below the specified thresholds listed in the electrical characteristics (v en ). the en pin must not be left floating because it is not internally pulled down/up. 6.3 power good the ldf features an open drain pg pin to sequence either external supplies or loads and to provide fault detection. this pin requires an external resistor (r pg ) to pull power good high when the output is within the power-good tolerance window. typical values for this resistor range from 10 k ? to 100 k ? .
typical characteristics ldf 12/34 docid025502 rev 1 7 typical characteristics c in = c out = 1 f, v in = v out +1 v, v en to v in, i out = 10 ma, unless otherwise specified. figure 5. output voltage vs. temperature, fixed version figure 6. output voltage vs. temperature, adjustable version 4.80 4.85 4.90 4.95 5.00 5.05 5.10 5.15 5.20 -50 -25 0 25 50 75 100 125 150 v out [v] temperature [ c] 5 v version, v in = v out + 1 v, i out = 10 ma am12771v1 am12772v1 785 790 795 800 805 810 815 -50 -25 0 25 50 75 100 125 150 v adj [ v ] temperature [ c] adjustable version, v in = 2.5 v, i out = 10 ma figure 7. line regulation vs. temperature figure 8. load regulation vs. temperature am12773v1 -0.02 -0.015 -0.01 -0.005 0 0.005 0.01 0.015 0.02 -50 -25 0 25 50 75 100 125 150 line regulation [%/v] temperature [ c] v in = v out + 1 v to 16 v, i out = 10 ma am12774v1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 -50-25 0 255075100125150 load r egulation [%/a] temperature [ c] v in =v out +1v, i out = 10ma to 1a
docid025502 rev 1 13/34 ldf typical characteristics 34 figure 9. short-circuit current vs. dropout figure 10. dropout voltage vs. temperature am12775v1 0 0.5 1 1.5 2 2.5 2 4 6 8 10 12 14 16 18 i sc [ a ] v drop [v] am12776v1 0 100 200 300 400 500 600 -50 -25 0 25 50 75 100 125 150 dropout voltage [ mv ] temperature [ c] v out = 3.3v, i out = 1a figure 11. quiescent current vs. temperature, i out = 10 ma figure 12. quiescent current vs. temperature, i out = 1 a am12777v1 0 5 10 15 20 25 30 35 40 45 50 -50 -25 0 25 50 75 100 125 150 iq [a] temperature [ c] i out = 0 ma am12778v1 a m 1 2 7 7 8 v 1 0 0.1 0.2 0.3 0.4 0.5 0.6 -50 -25 0 25 50 75 100 125 150 iq [ma] temperature [ c] i out = 1000ma figure 13. shutdown current vs. temperature figure 14. enable pin current vs. temperature am12779v1 a m 1 2 7 7 9 v 1 0 20 40 60 80 100 120 140 160 180 200 -50 -25 0 25 50 75 100 125 150 shutdown current [a] temperature [ c] v en = gnd am12780v1 a m 1 2 7 8 0 v 1 0 0.5 1 1.5 2 2.5 3 -50 -25 0 25 50 75 100 125 150 en current [a ] temperature [ c] v en = v in = 16 v
typical characteristics ldf 14/34 docid025502 rev 1 figure 15. enable high threshold vs. temperature figure 16. enable low threshold vs. temperature am12781v1 a m 1 2 7 8 1 v 1 0 0.5 1 1.5 2 2.5 -50 -25 0 25 50 75 100 125 150 enanle high threshold [v] temperature [ c] am12782v1 a m 1 2 7 8 2 v 1 0 0.5 1 1.5 2 2.5 -50 -25 0 25 50 75 100 125 150 enanle low threshold [v] temperature [ c] figure 17. output voltage vs. input voltage figure 18. line transient am12783v1 a m 1 2 7 8 3 v 1 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 2 2.3 2.6 2.9 3.2 3.5 3.8 4.1 4.4 4.7 5 5.3 5.6 5.9 vout [v] 5 v version, c in = 1 f, c out = 2.2 f, i out = 500 ma vin [v] v out = 3.3 v v in v out figure 19. load transient (v out = 3.3 v) figure 20. load transient (v out = v adj ) v out i out v en = v in = 4.5v; i out = from 1ma to 1a, t rise = t fall = 5s, c out =2.2f, v out =v adj v en = v in = 4.5v; i out = from 1ma to 1a, t rise = t fall = 5s, c out =2.2f, v out =3.3v v out i out
docid025502 rev 1 15/34 ldf typical characteristics 34 figure 21. start-up transient figure 22. enable transient v out = 3.3 v v in v out v out = 3.3 v v en v out figure 23. svr vs. frequency (v out = 5 v) figure 24. svr vs. frequency (v out = v adj ) am12784v1 a m 1 2 7 8 4 v 1 10 15 20 25 30 35 40 45 50 55 60 65 70 100 1000 10000 100000 svr [db] frequency [hz] v in = 6 v +/- 0.5 v, i out = 0.01 a, c out = 2.2 f v out = 5 v am12785v1 a m 1 2 7 8 5 v 1 10 15 20 25 30 35 40 45 50 55 60 65 70 100 1000 10000 100000 svr [db] frequency [hz] v in = 1.8 +/- 0.5 v, i out = 10 ma; c out = 2.2 f v out = v adj figure 25. stability plane adj (c out , esr) figure 26. stability plane 3.3 v (c out , esr) am12786v1 a m 1 2 7 8 6 v 1 adiustable version, v in = v en ; c in = 1 f 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 0123456789101112 esr @ 100 khz [ ] c out [f] (nominal value) stable zone am12787v1 a m 1 2 7 8 7 v 1 3.3 v version, v in = v en ; c in = 1 f 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 024681012141618202224 esr @ 100 khz [ ] c out [f] (nominal value) stable zone
package mechanical data ldf 16/34 docid025502 rev 1 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. table 7. dpak mechanical data dim. mm min. typ. max. a2.20 2.40 a1 0.90 1.10 a2 0.03 0.23 b0.64 0.90 b4 5.20 5.40 c0.45 0.60 c2 0.48 0.60 d6.00 6.20 d1 5.10 e6.40 6.60 e1 4.70 e2.28 e1 4.40 4.60 h 9.35 10.10 l1.00 1.50 (l1) 2.80 l2 0.80 l4 0.60 1.00 r0.20 v2 0 8
docid025502 rev 1 17/34 ldf package mechanical data 34 figure 27. dpak drawings 0068772_k
package mechanical data ldf 18/34 docid025502 rev 1 figure 28. dpak footprint (a) a. all dimensions are in millimeters. footprint_rev_k
docid025502 rev 1 19/34 ldf package mechanical data 34 table 8. ppak mechanical data dim. mm min. typ. max. a2.2 2.4 a1 0.9 1.1 a2 0.03 0.23 b0.4 0.6 b2 5.2 5.4 c 0.45 0.6 c2 0.48 0.6 d6 6.2 d1 5.1 e6.4 6.6 e1 4.7 e1.27 g 4.9 5.25 g1 2.38 2.7 h9.35 10.1 l2 0.8 1 l4 0.6 1 l5 1 l6 2.8 r0.20 v2 0 8
package mechanical data ldf 20/34 docid025502 rev 1 figure 29. ppak drawings 0078180_f
docid025502 rev 1 21/34 ldf package mechanical data 34 table 9. dfn6-3x3 mechanical data dim. mm min. typ. max. a0.80 1 a1 0 0.02 0.05 a3 0.20 b 0.23 0.45 d2.90 3 3.10 d2 2.23 2.50 e2.90 3 3.10 e2 1.50 1.75 e0.95 l 0.30 0.40 0.50
package mechanical data ldf 22/34 docid025502 rev 1 figure 30. dfn6-3x3 drawings b&
docid025502 rev 1 23/34 ldf package mechanical data 34 figure 31. dfn6-3x3 footprint b&
package mechanical data ldf 24/34 docid025502 rev 1 table 10.dfn6-2x2 mechanical data dim. mm min. typ. max. a 0.80 0.90 1.00 a1 0.00 0.02 0.05 b 0.25 0.30 0.35 d 2.00 bsc e 2.00 bsc e 0.65 bsc d2 1.45 1.60 1.70 e2 0.85 1.00 1.10 l 0.20 0.25 0.30 k0.15 aaa 0.05 bbb 0.10 ccc 0.10 ddd 0.05 eee 0.08 n6
docid025502 rev 1 25/34 ldf package mechanical data 34 figure 32. dfn6-2x2 drawings b$
package mechanical data ldf 26/34 docid025502 rev 1 figure 33. dfn6-2x2 footprint b$
docid025502 rev 1 27/34 ldf packaging mechanical data 34 9 packaging mechanical data table 11. ppak and dpak tape and reel mechanical data tape reel dim. mm dim. mm min. max. min. max. a0 6.8 7 a 330 b0 10.4 10.6 b 1.5 b1 12.1 c 12.8 13.2 d 1.5 1.6 d 20.2 d1 1.5 g 16.4 18.4 e 1.65 1.85 n 50 f 7.4 7.6 t 22.4 k0 2.55 2.75 p0 3.9 4.1 base qty. 2500 p1 7.9 8.1 bulk qty. 2500 p2 1.9 2.1 r40 t 0.25 0.35 w 15.7 16.3
packaging mechanical data ldf 28/34 docid025502 rev 1 figure 34. ppak and dpak tape figure 35. ppak and dpak reel p1 a0 d1 p0 f w e d b0 k0 t user direction of feed p2 10 pitches cumulative tolerance on tape +/- 0.2 mm user direction of feed r bending radius b1 for machine ref. only including draft and radii concentric around b0 am08852v1 top cover tape a d b full radius g measured at hub c n reel dimensions 40mm min. access hole at slot location t tape slot in core for tape start 25 mm min. width am08851v2
docid025502 rev 1 29/34 ldf packaging mechanical data 34 figure 36. dfn6-3x3 tape table 12. dfn6-3x3 tape and reel mechanical data dim. mm min. typ. max. a0 3.20 3.30 3.40 b0 3.20 3.30 3.40 k0 1 1.10 1.20 b1
packaging mechanical data ldf 30/34 docid025502 rev 1 figure 37. dfn6-3x3 reel b1
docid025502 rev 1 31/34 ldf packaging mechanical data 34 figure 38. dfn6-2x2 tape and reel table 13. dfn6-2x2 tape and reel mechanical data dim. mm min. typ. max. a 180 c12.8 13.2 d20.2 n60 t 14.4 ao 2.4 bo 2.4 ko 1.3 po 4 p4
order codes ldf 32/34 docid025502 rev 1 10 order codes different output voltage versions of the ldf available on request: table 14. device summary packages output voltages ppak dpak dfn6-3x3 dfn6-2x2 ldf18pt-tr 1.8 v ldf25pt-tr 2.5 v ldf33pt-tr ldf33dt-tr 3.3 v LDFPT-TR ldfpur ldfpvr adj
docid025502 rev 1 33/34 ldf revision history 34 11 revision history table 15. document revision history date revision changes 05-dec-2013 1 initial release.
ldf 34/34 docid025502 rev 1 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a particular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. st products are not designed or authorized for use in: (a) safety critical applications such as life supporting, active implanted devices or systems with product functional safety requirements; (b) aeronautic applications; (c) automotive applications or environments, and/or (d) aerospace applications or environments. where st products are not designed for such use, the purchaser shall use products at purchaser?s sole risk, even if st has been informed in writing of such usage, unless a product is expressly designated by st as being intended for ?automotive, automotive safety or medical? industry domains according to st product design specifications. products formally escc, qml or jan qualified are deemed suitable for use in aerospace by the corresponding governmental agency. resale of st products with provisions different from the statem ents and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or register ed trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2013 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - philippines - singapore - spain - swed en - switzerland - united kingdom - united states of america www.st.com

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