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this is information on a product in full production. november 2013 docid023585 rev 2 1/34 ldfm 500 ma very low drop voltage regulator datasheet - production data features ? input voltage from 2.5 to 16 v ? very low dropout voltage (300 mv max. at 500 ma load) ? low quiescent current (200 a typ. @ 500 ma load) ? available in 1% precision in ppak and dfn6 packages, 2% in dpak ? 500 ma 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 protection ? temperature range: - 40 c to 125 c applications ? pcs and laptop computers ? battery-powered equipment ? industrial and medical equipment ? portable equipment description the ldfm is a fast, very low drop linear regulator which operates from an input supply voltage in the range of 2.5 v to 16 v. it is available in fixed and adjustable output voltage versions, from 0.8 v to 12 v. the ldfm features 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 ldfm 2/34 docid023585 rev 2 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 performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 8 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 9 packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 10 order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 11 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
docid023585 rev 2 3/34 ldfm block diagram 34 1 block diagram figure 1. block diagram (generic version) $09
pin configuration ldfm 4/34 docid023585 rev 2 2 pin configuration figure 2. pin connection (top view) table 1. pin description dpak, ppak pin n symbol function ppak dpak 5 - adj/pg for adjustable versions: error amplifier input pin. for fixed version: 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. pin description dfn6-2x2 and 3x3 pin n symbol function 2adj/nc for adjustable versions: error amplifier input pin. for fixed version: 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 $09 7$% 7$% '3$. 33$. ')1
docid023585 rev 2 5/34 ldfm typical application 34 3 typical application figure 3. fixed versions figure 4. adjustable version (ppak and dfn6 packages only) $09 33$.dqg')1sdfndjhv '3$.sdfndjh $09 33$.sdfndjh ')1sdfndjhv
absolute maximum ratings ldfm 6/34 docid023585 rev 2 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 power good 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
docid023585 rev 2 7/34 ldfm 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. electrical characteristics for ldfm (fixed versions) symbol parameter test conditions min. typ. max. unit v in operating input voltage 2.5 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 500 ma 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 500 ma 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 500 ma 0.1 %/a 10 ma i load 500 ma, t j = -40 to 125 c 0.15 0.4 v drop dropout voltage (2) i load = 500 ma, -40 c electrical characteristics ldfm 8/34 docid023585 rev 2 svr supply voltage rejection v in = 6 v +/- 0.5 v ripple freq. = 120 hz, v out = 5 v 60 db v in = 6 v +/- 0.5 v ripple freq. = 10 khz, v out = 5 v 52 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 <1.5 v; v in = 2.5 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 for output voltages below 1.5 v. table 5. electrical characteristics for ldfm (fixed versions) (continued) symbol parameter test conditions min. typ. max. unit
docid023585 rev 2 9/34 ldfm 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. electrical characteristics for ldfm (adjustable version) symbol parameter test conditions min. typ. max. unit v in operating input voltage 2.5 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 500 ma 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 +1 v (1) v in 16 v, t j = -40 to 125 c 0.04 v out static load regulation 10 ma i load 500 ma 0.06 %/a 10 ma i load 500 ma, t j = -40 to 125 c 0.2 0.4 v drop dropout voltage (2) v out fixed to 2.5 v, i load = 500 ma, -40 c electrical characteristics ldfm 10/34 docid023585 rev 2 t shdn thermal shutdown 170 c hysteresis 10 1. for v out <1.5 v; v in = 2.5 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 for output voltages below 1.5 v. table 6. electrical characteristics for ldfm (adjustable version) (continued) symbol parameter test conditions min. typ. max. unit
docid023585 rev 2 11/34 ldfm application information 34 6 application information 6.1 external capacitors the ldfm requires external capacitors for regulator stability. these capacitors must be selected to meet the requirements of minimum capacitance and equivalent series resistance (see figure 25 and 26 ). it is advisable to locate the input/output capacitors as close as possible to the relative pins. 6.1.1 input capacitor an input capacitor with a minimum value of 1 f is required with the ldfm. this capacitor must be located a distance of not more than 0.5" from the input pin of the device and returned to a clean analog ground. any good quality ceramic capacitors can be used for this capacitor. 6.1.2 output capacitor it is possible to use ceramic capacitors but the output capacitor must meet the requirements for minimum amount of capacitance and e.s.r. (equivalent series resistance) value. a minimum capacitance of 2.2 f is a good choice to guarantee the stability of the regulator. however, other c out values can be used according to figure 25 and 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. also, capacitor tolerance and variation with temperature must be kept in consideration in order to assure the minimum amount of capacitance at all times. 6.2 enable pin operation the enable pin can be used to turn off the regulator when pulled down, so drastically reducing the current consumption. when the enable feature is not used, this pin must be tied to v in to keep the regulator output on at all times. to assure proper operation, the signal source used to drive the enable pin must be able to swing above and below the specified thresholds listed in the electrical characteristics section (v en ). the enable pin must not be left floating because it is not internally pulled down/up. 6.3 power good the ldfm features an open drain power good (pg) pin to sequence external supplies or loads and to provide fault detection. this pin requires an external resistor (r pg ) to pull pg high when the output is within the pg tolerance window. typical values for this resistor range from 10 k ? to 100 k ? .
typical performance characteristics ldfm 12/34 docid023585 rev 2 7 typical performance 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 figure 6. output voltage vs. temperature for adjustable figure 7. line regulation vs. temperature figure 8. load regulation vs. temperature figure 9. short-circuit current vs. drop voltage figure 10. dropout voltage vs. temperature 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 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 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 -50 -25 0 25 50 75 100 125 150 load regulation [%/a] temperature [ c] v in = v out + 1 v, i out = 10 ma to 0.5 a am12775v1 0 0.2 0.4 0.6 0.8 1 1.2 1.4 2 4 6 8 10 12 14 16 18 i sc [ a ] v drop [v] am12776v1 0 50 100 150 200 250 300 350 400 -50 -25 0 25 50 75 100 125 150 dropout voltage [ mv ] temperature [ c] v out = 3.3 v, i out = 500 ma
docid023585 rev 2 13/34 ldfm typical performance characteristics 34 figure 11. quiescent current vs. temperature (i out = 10 ma) figure 12. quiescent current vs. temperature (i out = 500 ma) figure 13. shutdown current vs. temperature figure 14. enable pin current vs. temperature am12777v1 0 50 100 150 200 250 300 -50 -25 0 25 50 75 100 125 150 iq [a] temperature [ c] i out =10ma 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 = 500ma 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 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 enable 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 enable low threshold [v] temperature [ c]
typical performance characteristics ldfm 14/34 docid023585 rev 2 figure 17. output voltage vs. input voltage figure 18. line transient v in = from 4.5 to 6.5 v, i out = 10 ma, t rise = t fall = 10 s, c out = 2.2 f figure 19. load transient (v out = 3.3 v) figure 20. load transient (v out = v adj ) v en = v in = 4.5 v, i out = from 1 to 500 ma, t rise = t fall = 5 s, c out = 2.2 f v en = v in = 4.5 v, i out = from 1 to 500 ma, t rise = t fall = 5 s, c out = 2.2 f figure 21. startup transient figure 22. enable transient v en = v in = from 0 to 16 v, i out = 10 ma, t rise = 10 s, c out = 2.2 f v in = 4.3 v, v en = from 0 to 4.3 v, i out = 10 ma, t rise = 100 s, c out = 2.2 f 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 v out i out v out = 3 .3 v v out i out v out = v adj v out = 3.3 v v in v out v out = 3.3 v v en v out
docid023585 rev 2 15/34 ldfm typical performance characteristics 34 figure 23. svr vs. frequency (v out = 5 v) figure 24. svr vs. frequency (v out = v adj ) figure 25. stability plane adj (c out, esr ) figure 26. stability plane 3.3 v (c out, esr ) 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 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 ldfm 16/34 docid023585 rev 2 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
docid023585 rev 2 17/34 ldfm package mechanical data 34 figure 27. dpak drawing 0068772_k
package mechanical data ldfm 18/34 docid023585 rev 2 figure 28. dpak footprint (a) a. all dimensions are in millimeters. footprint_rev_k
docid023585 rev 2 19/34 ldfm 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 ldfm 20/34 docid023585 rev 2 figure 29. ppak drawings 0078180_f
docid023585 rev 2 21/34 ldfm package mechanical data 34 table 9. dfn6 (3 x 3 mm) mechanical data dim. mm min. typ. max. a0.80 1 a1 0 0.02 0.05 a3 0.20 b 0.23 0.45 d 2.90 3 3.10 d2 2.23 2.50 e 2.90 3 3.10 e2 1.50 1.75 e0.95 l 0.30 0.40 0.50
package mechanical data ldfm 22/34 docid023585 rev 2 figure 30. dfn6 (3 x 3 mm) drawings b&
docid023585 rev 2 23/34 ldfm package mechanical data 34 figure 31. dfn6 (3 x 3 mm) footprint b&
package mechanical data ldfm 24/34 docid023585 rev 2 table 10.dfn6 (2 x 2 mm) 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
docid023585 rev 2 25/34 ldfm package mechanical data 34 figure 32. dfn6 (2 x 2 mm) drawings b$
package mechanical data ldfm 26/34 docid023585 rev 2 figure 33. dfn6 (2 x 2 mm) footprint b$
docid023585 rev 2 27/34 ldfm 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 ldfm 28/34 docid023585 rev 2 figure 34. tape for ppak and dpak figure 35. reel for ppak and dpak 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
docid023585 rev 2 29/34 ldfm packaging mechanical data 34 figure 36. tape for dfn6 (3 x 3 mm) table 12. dfn6 (3 x 3 mm) 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 ldfm 30/34 docid023585 rev 2 figure 37. reel for dfn6 (3 x 3 mm) b1
docid023585 rev 2 31/34 ldfm packaging mechanical data 34 figure 38. tape and reel for dfn6 (2 x 2 mm) table 13. dfn6 (2 x 2 mm) 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 ldfm 32/34 docid023585 rev 2 10 order codes table 14. device summary order codes packages output voltages LDFMPT-TR ppak adjustable from 0.8 v ldfmpur dfn6-3x3 ldfmpvr dfn6-2x2 ldfm50dt-tr dpak 5 v ldfm50pt-tr ppak
docid023585 rev 2 33/34 ldfm revision history 34 11 revision history table 15. document revision history date revision changes 28-aug-2012 1 initial release. 22-nov-2013 2 part numbers ldfm and ldfm50 have been unified under ldfm. updated the features and the description in cover page. cancelled table1: device summary. updated section 2: pin configuration, section 3: typical application, section 4: absolute maximum ratings, section 5: electrical characteristics and section 8: package mechanical data. added section 9: packaging mechanical data and section 10: order codes. minor text changes.
ldfm 34/34 docid023585 rev 2 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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