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september 2016 docid023585 rev 4 1 / 36 this is information on a product in full production. www.st.com 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 equ ipment ? 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.
contents ldfm 2 / 36 doci d023585 rev 4 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 infor mation ................................ ................................ ..... 16 8.1 ppak package information ................................ ............................. 17 8.2 ppak packing information ................................ .............................. 19 8.3 dpak (to - 252) package information ................................ .............. 21 8.4 dpak (to - 25 2) packing information ................................ ............... 24 8.5 dfn6 (2x2) package information ................................ .................... 26 8.6 dfn6 (2x2) packing information ................................ ...................... 29 8.7 dfn6 (3x3) package information ................................ .................... 30 8.8 dfn6 (3x3) pack ing information ................................ ...................... 32 9 ordering information ................................ ................................ ..... 34 10 revision history ................................ ................................ ............ 35
ldfm block diagram docid023585 rev 4 3 / 36 1 block diagram figure 1 : block diagram (generic version)
pin configuration ldfm 4 / 36 docid023585 rev 4 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 out put 2 1 v in input voltage 4 3 v out output voltage 1 - en enable pin logic input: low = shutdown, high = active 3 2 gnd ground tab tab gnd ground table 2: pin description dfn6 - 2x2 and 3x3 pin n symbol function 2 adj/nc for adjustable versions: erro r amplifier input pin. for fixed version: not connected 6 v in input voltage 1 v 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
ldfm typical application docid023585 rev 4 5 / 36 3 typical application figure 3 : fixed versions figure 4 : adjustable version (ppak and dfn6 packages only)
absolute maximum ratings ldfm 6 / 36 docid023585 rev 4 4 absolute maximum ratings 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 temperat ure range - 40 to 125 c 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 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
ldfm electrical characteristics docid023585 rev 4 7 / 36 5 electrical characteristics t j = 25 c, v in = v out(nom) + 1 v a , 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 v in 16 v (1) 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 regu lation 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 10 ma i load 500 ma, t j = - 40 to 125 c dfn6 version 10 mv v drop dropout voltage (2) i load = 500 ma, - 40 c < t j < 1 25 c 125 300 mv i q quiescent current on mode: v en = 2 v i load = 10 ma to 500 ma, t j = - 40 to 125 c 200 800 a off mode:v en = gnd, ppak and dfn versions 30 off mode:v en = gnd, ppak and dfn versions, - 40 c < t j < 125 c 120 i sc short - cir cuit current 0.8 a v en enable input logic low v in = 2.5 v to 16 v, - 40 c electrical characteristics ldfm 8 / 36 docid023585 rev 4 symbol parameter test conditions min. typ. max. unit falling edge 0. 8* v out power good output voltage low i sink = 6 ma, open drain output 0.4 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 volta ge 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 notes: (1) for v out < 1.5 v; v in = 2.5 v. (2) dropout voltage is the input - to - output voltage difference at which the output volta ge is 100 mv below its nominal value. this specification does not apply for output voltages below 1.5 v.
ldfm electrical characteristics docid023585 rev 4 9 / 36 t j = 25 c, v in = v out(nom) + 1 v a , c in = 1 f, c out = 2.2 f, i load = 10 ma, v en = 2 v, unless otherwise specified. table 6: electrical characteri stics 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 10 ma i load 500 ma, t j = - 40 to 125 c dfn6 version 10 v drop drop out voltage (2) v out fixed to 2.5 v, i load = 500 ma, - 40 c < t j < 125 c 125 300 mv i q quiescent current on mode: v en = 2 v i load = 10 ma to 500 ma, t j = - 40 to 125 c 200 800 a off mode:v en = gnd, ppak and dfn ver sions 30 off mode:v en = gnd, ppak and dfn versions, - 40 c < t j < 125 c 120 i sc short - circuit current 0.8 a v en enable input logic low v in = 2.5 v to 16 v, - 40 c < t j < 125 c 0.8 v enable input logic high 2 i en enable pin input c urrent v en = v in 5 10 a pg power good output threshold rising edge 0.92* v adj v falling edge 0.8* v adj power good output voltage low i sink = 6 ma, open drain output 0.4 a for v out < 1.5 v; v in = 2.5 v.
electrical characteristics ldfm 10 / 36 docid023585 rev 4 symbol parameter test conditions min. typ. max. unit svr supply voltage rejection v in = v out +1 v +/ - 0.5 v ripple freq. = 12 0 hz, v out = 0.8 v 62 db v in = v out +1 v +/ - 0.5 v ripple freq. = 10 khz, v out = 0.8 v 55 e n output noise voltage bw = 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 notes: (1) for v out < 1.5 v; v in = 2.5 v. (2) dropout voltage is the input - to - output voltage difference at which the output voltage is 100 mv below its nominal value. this specification does not apply for output voltages below 1.5 v.
ldfm application information docid023585 rev 4 11 / 36 6 application information 6.1 external capacitors the ldfm requires external capacitors for regulator stability. thes e capacitors must be selected to meet the requirements of minimum capacitance and equivalent series resistance (see figure 25: "stability plane adj (c out , esr)" and figure 26: "stability plan e 3.3 v (c out , esr)" ). 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 v alue 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 capac itor 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 resistanc e) 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: "stability plane adj (c out , esr)" and figure 26: "stability plane 3.3 v (c out , esr)" , 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 stab ility. 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 p roper 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 pul led 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 re sistor (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 / 36 docid023585 rev 4 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 adjustabl e figure 7 : line regulation vs temperature figure 8 : load regulation vs temperature figure 9 : short - circuit current vs drop voltage figure 10 : d ropout voltage vs temperature
ldfm typical performance characteristics docid023585 rev 4 13 / 36 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 figure 15 : enable high threshold vs temperature figure 16 : enable low threshold vs temperature
typical performance characteristics ldfm 14 / 36 docid023585 rev 4 figure 17 : output voltage vs input voltage figure 18 : line transient figure 19 : load transient (v out = 3.3 v) figure 20 : load transient (v out = v adj )
ldfm typical performance characteristics docid023585 rev 4 15 / 36 figure 21 : startup transient figure 22 : enable transient figure 23 : svr vs frequency (v out = 5 v) figure 24 : svr vs frequency (v out = v adj ) figu re 25 : stability plane adj (c out , esr) figure 26 : stability plane 3.3 v (c out , esr)
package information ldfm 16 / 36 docid023585 rev 4 8 package information in order to mee t 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.
ldfm package information docid023585 rev 4 17 / 36 8.1 ppak package information figure 27 : ppak package outline
package information ldfm 18 / 36 docid023585 rev 4 table 7: ppak mechanical data dim. mm min. typ. max. a 2.2 2.4 a1 0. 9 1.1 a2 0.03 0.23 b 0.4 0.6 b2 5.2 5.4 c 0.45 0.6 c2 0.48 0.6 d 6 6.2 d1 5.1 e 6.4 6.6 e1 4.7 e 1.27 g 4.9 5.25 g1 2.38 2.7 h 9.35 10.1 l2 0.8 1 l4 0.6 1 l5 1 l6 2.8 r 0.20 v2 0 8
ldfm package information docid023585 rev 4 19 / 36 8.2 ppak packing information figure 28 : ppak tape outline
package information ldfm 20 / 36 docid023585 rev 4 figure 29 : ppak reel outline table 8: ppak 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 r 40 t 0.25 0.35 w 15.7 16.3
ldfm package information docid023585 rev 4 21 / 36 8.3 dpak (to - 252) package information figure 30 : dpak (to - 252) package outline
package information ldfm 22 / 36 docid023585 rev 4 table 9: dpak (to - 252) mechanical data dim. mm min. typ. max. a 2.20 2.40 a1 0.90 1.10 a2 0.03 0.23 b 0.64 0.90 b4 5.20 5.40 c 0.45 0.60 c2 0.48 0.60 d 6.00 6.20 d1 5.10 e 6.40 6.60 e1 5.20 e 2.28 e1 4.40 4.60 h 9.35 10.10 l 1.00 1.50 (l1) 2.80 l2 0.80 l4 0.60 1.00 r 0.20 v2 0 8
ldfm package information docid023585 rev 4 23 / 36 figure 31 : dpak (to - 252) recommended footprint (dimensions are in mm)
package information ldfm 24 / 36 docid023585 rev 4 8.4 dpak (to - 252) packing information figure 32 : dpak (to - 252) tape outline
ldfm package infor mation docid023585 rev 4 25 / 36 figure 33 : dpak (to - 252) reel outline table 10: dpak (to - 252) 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 r 40 t 0.25 0.35 w 15.7 16.3
package information ldfm 26 / 36 docid023585 rev 4 8.5 dfn6 (2x2) package information figure 34 : dfn6 (2x2) package outline
ldfm package information docid023585 rev 4 27 / 36 table 11: 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 1.70 e2 0.85 1.10 l 0.20 0.30 k 0.15 aaa 0.05 bbb 0.10 ccc 0.10 ddd 0.05 eee 0.08 n 6
package information ldfm 28 / 36 docid023585 rev 4 figure 35 : dfn 6 (2x2) recommended footprint
ldfm package information docid023585 rev 4 29 / 36 8.6 dfn6 (2x2) packing information figure 36 : dfn6 (2x2) reel outline table 12: dfn6 (2x2) tape and reel mechan ical data dim. mm min. typ. max. a 180 c 12.8 13.2 d 20.2 n 60 t 14.4 a0 2.4 b0 2.4 k0 1.3 p0 4 p 4
package information ldfm 30 / 36 docid023585 rev 4 8.7 dfn6 (3x3) package information fi gure 37 : dfn6 (3x3) package outline
ldfm package information docid023585 rev 4 31 / 36 table 13: dfn6 (3x3) mechanical data dim. mm min. typ. max. a 0.80 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 e 0.95 l 0.30 0.40 0.50 figure 38 : dfn6 (3x3) recommended footprint
package information ldfm 32 / 36 docid023585 rev 4 8.8 dfn6 (3x3) packing information figure 39 : dfn6 (3x3) tape outline
ldfm package information docid023585 rev 4 33 / 36 figure 40 : dfn6 (3x3 mm) reel outline table 14: 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
ordering information ldfm 34 / 36 docid023585 rev 4 9 ordering information table 15: order code order code package output voltage ldfmpt - tr ppak adjustable from 0.8 v ldfmpur dfn6 - 3x3 ldfmpvr dfn6 - 2x2 ldfm33pur dfn6 - 3x3 3.3 v ldfm33pvr dfn6 - 2x2 ldfm50dt - tr dp ak 5 v ldfm50pt - tr ppak
ldfm revision history docid023585 rev 4 35 / 36 10 revision history table 16: document revision history date revision changes 28 - aug - 2012 1 initial release. 22 - nov - 2013 2 part numbers ldfm and ldf m50 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 c haracteristics and section 8: package information. added section 8.7: dfn6 (3 x 3 mm) packing information and section 9: order code. minor text changes. 15 - jun - 2015 3 updated table 5: electrical characteristics for ldfm (fixed versions) and table 6: elect rical characteristics for ldfm (adjustable version) . minor text changes. 05 - sep - 2016 4 updated section 9: "ordering information" . minor text changes.
ldfm 36 / 36 docid023585 rev 4 important notice C please read carefully stmicroelectronics nv and its subsidiaries (st) reserve the right to make changes, corrections, enhancements, modifications , and improvements to st products and/or to this document at any time witho ut notice. purchasers should obtain the latest relevant information on st products before placing orders. st products are sold pursuant to sts terms and conditions of sale in place at the time of or der acknowledgement. purchasers are solely responsible for the choice, selection, and use of st products and st assumes no liability for application assistance or the design of purchasers products. no license, express or implied, to any intellectual property right is granted by st herein. resale of st pr oducts with provisions different from the information set forth herein shall void any warranty granted by st for such product . st and the st logo are trademarks of st. all other product or service names are the property of their respective owners. info rmation in this document supersedes and replaces information previously supplied in any prior versions of this document. ? 2016 stmicroelectronics C all rights reserved

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