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this is information on a product in full production. february 2014 docid15470 rev 2 1/25 ld39050 500 ma low quiescent current and low noise voltage regulator datasheet - production data features ? input voltage from 1.5 to 5.5 v ? ultra low-dropout voltage (200 mv typ. at 500 ma load) ? very low quiescent current (20 a typ. at no load, 100 a typ. at 500 ma load, 1 a max. in off mode) ? very low noise without bypass capacitor ? output voltage tolerance: 2.0% @ 25 c ? 500 ma guaranteed output current ? wide range of output voltages available on request: 0.8 v to 4.5 v with 100 mv step and adjustable from 0.8 v ? logic-controlled electronic shutdown ? compatible with ceramic capacitor c out = 1 f ? internal current and thermal limit ? package dfn6 (3x3 mm) ? temperature range: from -40 c to 125 c description the ld39050 provides 500 ma maximum current with an input voltage range from 1.5 v to 5.5 v and a typical dropout voltage of 200 mv. stability is given by ceramic capacitors. the ultra low drop voltage, low quiescent current and low noise features make it suitable for low power battery- powered applications. power supply rejection is 65 db at low frequencies and starts to roll off at 10 khz. the enable logic control function puts the ld39050 in shutdown mode allowing a total current consumption lower than 1 a. the device also includes short-circuit constant current limiting and thermal protection. typical applications are mobile phones, personal digital assistants (pdas), cordless phones and similar battery- powered systems. dfn6 (3x3 mm) table 1. device summary order codes output voltages ld39050pur adjustable from 0.8 v ld39050pu25r 2.5 v LD39050PU33R 3.3 v www.st.com
contents ld39050 2/25 docid15470 rev 2 contents 1 diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 6.1 power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 6.2 enable function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 6.3 power good function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 7 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 8 packaging mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 9 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
docid15470 rev 2 3/25 ld39050 diagrams 25 1 diagrams figure 1. schematic diagram for the ld39050 (adjustable) current limit thermal protection out gnd opamp in power-good signal pg internal enable in adj en bandgap reference current limit thermal protection out gnd opamp in power-good signal pg internal enable in in adj en bandgap reference figure 2. schematic diagram for the ld39050 (fixed output) current limit thermal protection out gnd opamp in power-good signal pg internal enable in nc en bandgap reference r 1 r 2 current limit thermal protection out gnd opamp in power-good signal pg internal enable in in nc en bandgap reference r 1 r 2
pin configuration ld39050 4/25 docid15470 rev 2 2 pin configuration figure 3. pin connection (top view) ld39050 (fixed version) en gnd pg v in nc v out en gnd pg v in adj v out ld39050 (adjustable version) table 2. pin description symbol pin n function ld39050 (adjustable) ld39050 (fixed) en 1 1 enable pin logic input: low = shutdown, high = active gnd 2 2 common ground pg 3 3 power good v out 4 4 output voltage adj 5 - adjustable pin v in 6 6 input voltage of the ldo nc - 5 not connected gnd exposed pad exposed pad must be connected to gnd
docid15470 rev 2 5/25 ld39050 maximum ratings 25 3 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 7 v v out dc output voltage -0.3 to v i + 0.3 (7 v max.) v en enable pin -0.3 to v i + 0.3 (7 v max.) v pg power good pin -0.3 to 7 v adj adjustable pin 4 v i out output current internally limited p d power dissipation internally limited 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 r thja thermal resistance junction-ambient 55 c/w r thjc thermal resistance junction-case 10 c/w table 5. esd performance symbol parameter test conditions value unit esd esd protection voltage hbm 2 kv mm 0.3 kv
electrical characteristics ld39050 6/25 docid15470 rev 2 4 electrical characteristics t j = 25 c, v in = 1.8 v, c in = c out = 1 f, i out = 10 ma, v en = v in , unless otherwise specified. table 6. electrical characteristics for the ld39050 (adjustable) symbol parameter test conditions min. typ. max. unit v in operating input voltage 1.5 5.5 v v adj v adj accuracy i out = 10 ma, t j = 25 c 784 800 816 mv i out = 10 ma, -40 c < t j < 125 c 776 800 824 i adj adjustable pin current 1 a v out static line regulation v out +1 v v in 5.5 v, i out = 1 ma 0.01 %/v v out transient line regulation (1) v in = 500 mv, i out = 10 ma, t r = 5 s 10 mvpp v in = 500 mv, i out = 10 ma, t f = 5 s 10 v out static load regulation i out = 10 ma to 500 ma 0.002 %/ma v out transient load regulation (1) i out = 10 ma to 500 ma, t r = 5 s 40 mvpp i out = 10 ma to 500 ma, t f = 5 s 40 v drop dropout voltage (2) i o = 500 ma, v out fixed to 1.5 v 40 c < t j < 125 c 200 400 mv e n output noise voltage 10 hz to 100 khz, i out = 100 ma, v out = 0.8 v 30 v rms svr supply voltage rejection v out = 0.8 v v in = 1.8 v+/-v ripple v ripple = 0.25 v, frequency = 1 khz i out = 10 ma 65 db v in = 1.8 v+/-v ripple v ripple = 0.25 v, frequency =10 khz i out = 100 ma 62 i q quiescent current i out = 0 ma 20 a i out = 0 ma, -40 c < t j < 125 c 50 i out = 0 to 500 ma 100 i out = 0 to 500 ma, -40 c docid15470 rev 2 7/25 ld39050 electrical characteristics 25 pg power good output threshold rising edge 0.92* v out v falling edge 0.8* v out power good output voltage low i sink = 6 ma open drain output 0.4 v i sc short-circuit current r l = 0 600 800 ma v en enable input logic low v in = 1.5 v to 5.5 v, 40 c < t j < 125 c 0.4 v enable input logic high v in = 1.5 v to 5.5 v, 40 c < t j < 125 c 0.9 v i en enable pin input current v en = v in 0.1 100 na t on turn-on time (4) 30 s t shdn thermal shutdown 160 c hysteresis 20 c out output capacitor capacitance (see typical performance characteristics for stability) 122f 1. all transient values are guaranteed by design, not production tested 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 1.5 v 3. pg pin floating 4. turn-on time is time measured between the enable input just exceeding v en high value and the output voltage just reaching 95% of its nominal value table 6. electrical characteristics for the ld39050 (adjustable) (continued) symbol parameter test conditions min. typ. max. unit
electrical characteristics ld39050 8/25 docid15470 rev 2 t j = 25 c, v in = v out(nom) + 1 v, c in = c out = 1 f, i out = 10 ma, v en = v in , unless otherwise specified. table 7. electrical characteristics for the ld39050 (fixed output) symbol parameter test conditions min. typ. max. unit v in operating input voltage 1.5 5.5 v v out v out accuracy v out >1.5 v, i out =10 ma, t j = 25 c -2.0 2.0 % v out >1.5 v, i out = 10 ma, -40 c 1.5 v -40 c < t j < 125 c 200 400 mv e n output noise voltage 10 hz to 100 khz, i o = 100 ma, 30 v rms svr supply voltage rejection v out = 1.5 v v in = v out(nom ) + 0.5 v+/-v ripple v ripple = 0.1 v, freq. = 1 khz i out = 10 ma 65 db v in = v out(nom) + 0.5 v+/- v ripple v ripple = 0.1 v, frequency =10 khz i out = 100 ma 62
docid15470 rev 2 9/25 ld39050 electrical characteristics 25 i q quiescent current i out = 0 ma 20 a i out = 0 ma, -40 c < t j < 125 c 50 i out = 0 to 500 ma 100 i out = 0 to 500 ma -40 c < t j < 125 c 200 v in input current in off mode: v en = gnd (3) 0.001 1 pg power good output threshold rising edge 0.92* v out v falling edge 0.8* v out power good output voltage low i sink = 6 ma open drain output 0.4 v i sc short-circuit current r l =0 600 800 ma v en enable input logic low v in =1.5 v to 5.5 v, - 40 c < t j < 125 c 0.4 v enable input logic high v in =1.5 v to 5.5 v, -40 c < t j < 125 c 0.9 v i en enable pin input current v en = v in 0.1 100 na t on turn-on time (4) 30 s t shdn thermal shutdown 160 c hysteresis 20 c out output capacitor capacitance (see typical performance characteristics for stability) 122f 1. all transient values are guaranteed by design, not production tested 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 1.5 v 3. pg pin floating 4. turn-on time is time measured between the enable input just exceeding v en high value and the output voltage just reaching 95% of its nominal value table 7. electrical characteristics for the ld39050 (fixed output) (continued) symbol parameter test conditions min. typ. max. unit
typical performance characteristics ld39050 10/25 docid15470 rev 2 5 typical performance characteristics figure 4. v adj accuracy figure 5. v out accuracy figure 6. dropout voltage vs. temperature (v out = 1.5 v) figure 7. dropout voltage vs. temperature (v out = 2.5 v) 0.75 0.76 0.77 0.78 0.79 0.8 0.81 0.82 0.83 0.84 0.85 -50 -25 0 25 50 75 100 125 150 t [c] v adj [v] v in = 1.8 v i out = 10 ma v en = v in 0.75 0.76 0.77 0.78 0.79 0.8 0.81 0.82 0.83 0.84 0.85 -50 -25 0 25 50 75 100 125 150 t [c] v adj [v] v in = 1.8 v i out = 10 ma v en = v in 2.45 2.46 2.47 2.48 2.49 2.5 2.51 2.52 2.53 2.54 2.55 -50 -25 0 25 50 75 100 125 150 t [c] v out [v] v in = 3.5 v i out = 10 ma v en = v in 2.45 2.46 2.47 2.48 2.49 2.5 2.51 2.52 2.53 2.54 2.55 -50 -25 0 25 50 75 100 125 150 t [c] v out [v] v in = 3.5 v i out = 10 ma v en = v in 0 50 100 150 200 250 300 350 -50 -25 0 25 50 75 100 125 150 t [c] dropout [mv] c in = c out = 1 f v en to v in , i out = 500 ma, v out @ 1.5 v 0 50 100 150 200 250 300 350 -50 -25 0 25 50 75 100 125 150 t [c] dropout [mv] c in = c out = 1 f v en to v in , i out = 500 ma, v out @ 1.5 v 0 50 100 150 200 250 300 350 -50 -25 0 25 50 75 100 125 150 t [c] dropout [mv] c in = c out = 1 f v en to v in , i out = 500 ma, v out = 2.5 v 0 50 100 150 200 250 300 350 -50 -25 0 25 50 75 100 125 150 t [c] dropout [mv] c in = c out = 1 f v en to v in , i out = 500 ma, v out = 2.5 v
docid15470 rev 2 11/25 ld39050 typical performance characteristics 25 figure 8. dropout voltage vs. output current figure 9. short-circuit current vs. dropout voltage figure 10. output voltage vs. input voltage figure 11. quiescent current vs. temperature (v out = 0.8 v) figure 12. quiescent current vs. temperature (v out = 2.5 v) figure 13. quiescent current in off mode vs. temperature 0 0.025 0.05 0.075 0.1 0.125 0.15 0.175 0.2 0.225 0.25 0.275 0.3 0 100 200 300 400 500 600 i out [ma] dropout [v] v en to v in , c in = c out = 1 f 0 0.025 0.05 0.075 0.1 0.125 0.15 0.175 0.2 0.225 0.25 0.275 0.3 0 100 200 300 400 500 600 i out [ma] dropout [v] v en to v in , c in = c out = 1 f 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 0123456 v drop [v] i sc [a] 125 c 85 c 55 c 25 c 0 c -25 c -40 c v in from 0 to 5.5 v, v en = v in , c in = 1 f, c out = 1 f 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 0123456 v drop [v] i sc [a] 125 c 85 c 55 c 25 c 0 c -25 c -40 c v in from 0 to 5.5 v, v en = v in , c in = 1 f, c out = 1 f 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 00.511.522.533.544.555.5 v in [v] v out [v] 125c 85c 55c 25c 0c - 25c - 40c v en = v in , c in = c out = 1 f; i out = 500 ma 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 00.511.522.533.544.555.5 v in [v] v out [v] 125c 85c 55c 25c 0c - 25c - 40c v en = v in , c in = c out = 1 f; i out = 500 ma 0 10 20 30 40 50 60 70 80 90 100 -50 -25 0 25 50 75 100 125 150 t [c] iq [a] no load i out = 0.5 a v in = 1.8 v, v en to v in , c in = 1 f c out = 1 f, v out = 0.8 v 0 10 20 30 40 50 60 70 80 90 100 -50 -25 0 25 50 75 100 125 150 t [c] iq [a] no load i out = 0.5 a v in = 1.8 v, v en to v in , c in = 1 f c out = 1 f, v out = 0.8 v 0 10 20 30 40 50 60 70 80 90 100 -50 -25 0 25 50 75 100 125 150 t [c] iq [a] no load i out = 0.5 a v in = 3.5 v, v en to v in , c in = c out = 1 f, v out = 2.5 v 0 10 20 30 40 50 60 70 80 90 100 -50 -25 0 25 50 75 100 125 150 t [c] iq [a] no load i out = 0.5 a v in = 3.5 v, v en to v in , c in = c out = 1 f, v out = 2.5 v 0 0.1 0.2 0.3 0.4 0.5 0.6 -50 -25 0 25 50 75 100 125 150 t [c] iq [a] v in = 3.5 v, v out = 2.5 v, v en = gnd, c in = c out = 1 f 0 0.1 0.2 0.3 0.4 0.5 0.6 -50 -25 0 25 50 75 100 125 150 t [c] iq [a] v in = 3.5 v, v out = 2.5 v, v en = gnd, c in = c out = 1 f
typical performance characteristics ld39050 12/25 docid15470 rev 2 figure 14. load regulation fi gure 15. line regulation (v out = 0.8 v) figure 16. line regulation (v out = 2.5 v) figure 17. supply voltage rejection vs. temperature (v out = 0.8 v, f = 1 khz) figure 18. supply voltage rejection vs. temperature (v out = 0.8 v, f = 10 khz) figure 19. supply voltage rejection vs. temperature (v out = 2.5 v, f = 1 khz) -0.04 -0.03 -0.02 -0.01 0 0.01 0.02 0.03 0.04 -50 -25 0 25 50 75 100 125 150 t [c] load [%/ma] v in = 1.8 v, i out = from 10 ma to 500 ma, v out = 0.8 v, v en = v in -0.04 -0.03 -0.02 -0.01 0 0.01 0.02 0.03 0.04 -50 -25 0 25 50 75 100 125 150 t [c] load [%/ma] v in = 1.8 v, i out = from 10 ma to 500 ma, v out = 0.8 v, v en = v in -0.04 -0.03 -0.02 -0.01 0 0.01 0.02 0.03 0.04 -50 -25 0 25 50 75 100 125 150 t [c] line [%/v] i out = 1 ma i out = 100 ma v in = from 1.8 v to 5.5 v v en = v in v out = 0.8 v -0.04 -0.03 -0.02 -0.01 0 0.01 0.02 0.03 0.04 -50 -25 0 25 50 75 100 125 150 t [c] line [%/v] i out = 1 ma i out = 100 ma v in = from 1.8 v to 5.5 v v en = v in v out = 0.8 v -0.04 -0.03 -0.02 -0.01 0 0.01 0.02 0.03 0.04 -50 -25 0 25 50 75 100 125 150 t [c] line [%/v] i out = 1 ma i out = 100 ma v in = from 3.5 v to 5.5 v v out = 2.5 v v en = v in -0.04 -0.03 -0.02 -0.01 0 0.01 0.02 0.03 0.04 -50 -25 0 25 50 75 100 125 150 t [c] line [%/v] i out = 1 ma i out = 100 ma v in = from 3.5 v to 5.5 v v out = 2.5 v v en = v in 0 10 20 30 40 50 60 70 80 90 100 -50 -25 0 25 50 75 100 125 150 t [c] svr [db] c in = c out = 1 f v in from 1.7 v to 1.9 v, v out = 0.8 v, v en to v in , i out = 10 ma, freq. = 1 khz 0 10 20 30 40 50 60 70 80 90 100 -50 -25 0 25 50 75 100 125 150 t [c] svr [db] c in = c out = 1 f v in from 1.7 v to 1.9 v, v out = 0.8 v, v en to v in , i out = 10 ma, freq. = 1 khz 0 10 20 30 40 50 60 70 80 90 100 -50 -25 0 25 50 75 100 125 150 t [c] svr [db] c in = c out = 1 f v in from 1.7 v to 1.9 v, v out = 0.8 v, v en to v in , i out = 100 ma, freq. = 10 khz 0 10 20 30 40 50 60 70 80 90 100 -50 -25 0 25 50 75 100 125 150 t [c] svr [db] c in = c out = 1 f v in from 1.7 v to 1.9 v, v out = 0.8 v, v en to v in , i out = 100 ma, freq. = 10 khz 0 10 20 30 40 50 60 70 80 90 100 -50 -25 0 25 50 75 100 125 150 t [c] svr [db] c in = c out = 1 f v in from 2.9 v to 3.1 v, v out = 2.5 v, v en to v in , i out = 10 ma, freq. = 1 khz 0 10 20 30 40 50 60 70 80 90 100 -50 -25 0 25 50 75 100 125 150 t [c] svr [db] c in = c out = 1 f v in from 2.9 v to 3.1 v, v out = 2.5 v, v en to v in , i out = 10 ma, freq. = 1 khz
docid15470 rev 2 13/25 ld39050 typical performance characteristics 25 figure 20. supply voltage rejection vs. temperature (v out = 2.5 v, f = 10 khz) figure 21. supply voltage rejection vs. frequency (v out = 0.8 v) figure 22. supply voltage rejection vs. frequency (v out = 2.5 v) figure 23. noise output voltage vs. frequency v in = 1.8 v, v out = 0.8 v, v en = 1 v, c in = c out = 1 f, t a = 25 c figure 24. enable voltage vs. temperature (v in = 3.5 v) figure 25. enable voltage vs. temperature (v in = 5.5 v) 0 10 20 30 40 50 60 70 80 90 100 -50 -25 0 25 50 75 100 125 150 t [c] svr [db] c in = c out = 1 f v in from 2.9 v to 3.1 v, v out = 2.5 v, v en to v in , i out = 100 ma, freq. = 10 khz 0 10 20 30 40 50 60 70 80 90 100 -50 -25 0 25 50 75 100 125 150 t [c] svr [db] c in = c out = 1 f v in from 2.9 v to 3.1 v, v out = 2.5 v, v en to v in , i out = 100 ma, freq. = 10 khz 0 10 20 30 40 50 60 70 80 90 100 0 102030405060708090100 freq [khz] svr [db] i out = 10 ma i out = 100 ma v in from 1.7 v to 1.9 v, v en to v in , v out = 0.8 v, c in = c out = 1 f 0 10 20 30 40 50 60 70 80 90 100 0 102030405060708090100 freq [khz] svr [db] i out = 10 ma i out = 100 ma v in from 1.7 v to 1.9 v, v en to v in , v out = 0.8 v, c in = c out = 1 f 0 10 20 30 40 50 60 70 80 90 100 0 102030405060708090100 freq [khz] svr [db] i out = 10 ma i out = 100 ma v in from 2.9 v to 3.1 v, v en to v in , v out = 2.5 v, c in = c out = 1 f 0 10 20 30 40 50 60 70 80 90 100 0 102030405060708090100 freq [khz] svr [db] i out = 10 ma i out = 100 ma v in from 2.9 v to 3.1 v, v en to v in , v out = 2.5 v, c in = c out = 1 f 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 1.e+01 1.e+02 1.e+03 1.e+04 1.e+05 f [hz] en [uv/sqrt(hz)] ap - iout = 100ma ap - iout = 10ma ap - iout = 1m ap - iout = 0a 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 -50 -25 0 25 50 75 100 125 150 t [c] v en [v] high low v in = 3.5 v i out = 10 ma, v out = 2.5 v, c in = c out = 1 f 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 -50 -25 0 25 50 75 100 125 150 t [c] v en [v] high low v in = 3.5 v i out = 10 ma, v out = 2.5 v, c in = c out = 1 f 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 -50 -25 0 25 50 75 100 125 150 t [c] v en [v] high low v in = 5.5 v i out = 10 ma v out = 2.5 v, c in = c out = 1 f 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 -50 -25 0 25 50 75 100 125 150 t [c] v en [v] high low v in = 5.5 v i out = 10 ma v out = 2.5 v, c in = c out = 1 f
typical performance characteristics ld39050 14/25 docid15470 rev 2 figure 26. load transient (v out = 0.8 v) figure 27. load transient (v out = 2.5 v) v en = v in =1.8 v, i out = from10 ma to 0.5 a, c in = c out = 1 f, v out = 0.8 v v en = v in = 3.5v, i out from 10 ma to 0.5 a, v out = 2.5 v, c in = c out = 1 f figure 28. load transient (v out =2.5 v, i out from 0.1 a to 0.5 a) figure 29. line transient v en = v in = 3.5 v, i out from 100 ma to 0.5 a, v out = 2.5 v, c in = c out = 1 f v en = v in from 4.3 v to 4.8 v, i out = 10 ma, c out = 1 f, c in = no figure 30. start-up transient figure 31. enable transient v en = v in = from 0 v to 5.5 v, i out =10 ma, c in = c out = 1 f, v out = 2.5 v v en from 0 v to 2 v, v in = 3.5 v, v out = 2.5 v, i out = 10 ma, c in = c out = 1f i out v out i out v out i out v out i out v out i out v out i out v out v in v out v in v out v in v out v in v out v en v out v en v out
docid15470 rev 2 15/25 ld39050 typical performance characteristics 25 figure 32. esr required for stability with ceramic capacitors (v out = 0.8 v) figure 33. esr required for stability with ceramic capacitors (v out = 2.5 v) v in = v en = from 1.8 v to 5.5 v, i out = from 1 ma to 500 ma, v out = 0.8 v, c in = 1 f v in = v en = from 3.5 v to 5.5 v, i out = from 1 ma to 500 ma, v out = 2.5 v, c in = 1 f 0 0.25 0.5 0.75 1 1.25 1.5 1 2 3 4 5 6 7 8 9 10111213141516171819202122 c out [f] (nominal value) esr @ 100 khz [ ] unstable zone stable zone 0 0.25 0.5 0.75 1 1.25 1.5 1 2 3 4 5 6 7 8 9 10111213141516171819202122 c out [f] (nominal value) esr @ 100 khz [ ] unstable zone stable zone 0 0.25 0.5 0.75 1 1.25 1.5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 c out [f] (nominal value) esr @ 100 khz [ ] stable zone unstable zone 0 0.25 0.5 0.75 1 1.25 1.5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 c out [f] (nominal value) esr @ 100 khz [ ] stable zone unstable zone
application information ld39050 16/25 docid15470 rev 2 6 application information the ld39050 is an ultra low-dropout linear regulator. it provides up to 500 ma with a 200 mv dropout. the input voltage range is from 1.5 v to 5.5 v. the device is available in fixed and adjustable output versions. the regulator is equipped with internal protection circuitry, such as short-circuit current limiting and thermal protection. the regulator is designed to be stable with ceramic capacitors on the input and the output. the values of the input and output ceramic capacitors are from 1 f to 22 f with 1 f typical. the input capacitor must be connected within 0.5 inches of the v in terminal. the output capacitor must also be connected within 0.5 inches of output pin. there is no upper limit to the value of the input capacitor. figure 34 and figure 35 illustrate the typical application schematics: figure 34. application schematic for fixed version 9 9 1 ,1 , ' ' 1 *1 * 9 9 1 ,1 , 1 (1 ( * 3* 3 9 9 7 7 8 28 2 9 9 7 7 8 28 2 & 7 7 8 28 2 & 1& 1 ' /' / ) ? ) ? & 1 ,1 , 1 1 2 )2 ) ) 2) 2 ) ? ) ?
docid15470 rev 2 17/25 ld39050 application information 25 regarding to the adjustable version, the output voltage can be adjusted from 0.8 v up to the input voltage minus the voltage drop across the pmos (dropout voltage), by connecting a resistor divider between the adj pin and the output, thus allowing the remote voltage sensing. the resistor divider should be selected using the following equation: v out = v adj (1 + r 1 / r 2 ) with v adj = 0.8 v (typ.) resistors should be used with values in the range from 10 k to 50 k . lower values can also be suitable, but they increase current consumption. 6.1 power dissipation an internal thermal feedback loop disables the output voltage if the die temperature reaches approximately 160 c. this feature protects the device from excessive temperature and allows the user to push the limits of the power handling capability of a given board without damaging the device. a good pc board layout should be used to maximize the power dissipation. the thermal path for the heat generated by the device goes from the die to the copper lead frame through the package leads and exposed pad to the pc board copper. the pc board copper acts as a heat sink. the footprint copper pads should be as wider as possible to spread and dissipate the heat to the surrounding ambient. feed-through vias to inner or backside copper layers improve the overall thermal performance of the device. the power dissipation of the device depends on the input voltage, output voltage and output current, and is given by: p d = (v in -v out ) i out the junction temperature of the device is: t j_max = t a + r thja x p d where: figure 35. application schematic for adjustable version ' ' 1 *1 * 9 9 1 (1 ( 1 21 2 ) ) ) 2) 2 * 3* 3 - - ' $' $ 9 9 5 5 ' / ' / 9 9 9 9 ,, 1 ,1 , 1 ,1 , & 1 ,1 , 9 9 7 7 8 28 2 7 7 8 28 2 & 7 7 8 28 2 ) ? ) ? ) ? ) ?
application information ld39050 18/25 docid15470 rev 2 t j_max is the maximum junction of the die,125 c; t a is the ambient temperature; r thja is the thermal resistance junction-to-ambient. 6.2 enable function the ld39050 features an enable function. when the en voltage is higher than 2 v the device is on, and if it is lower than 0.8 v the device is off. in shutdown mode, consumption is lower than 1 a. the en pin does not have an internal pull-up, therefore it cannot be left floating if it is not used. 6.3 power good function most applications require a flag showing that the output voltage is in the correct range. the power good threshold depends on the adjustable voltage. when the adjustable voltage is higher than 0.92*v adj , the power good (pg) pin goes to high impedance. if it is below 0.80*v adj the pg pin goes to low impedance. if the device is working well, the pg pin is at high impedance. if the output voltage is fixed using an external or internal resistor divider, the power good threshold is 0.92*v out . the use of the power good function requires an external pull-up resistor, which must be connected between the pg pin and v in or v out . the typical current capability of the pg pin is up to 6 ma. the use of a pull-up resistor for pg in the range from 100 k to 1 m is recommended. if the power good function is not used, the pg pin must remain floating.
docid15470 rev 2 19/25 ld39050 package mechanical data 25 7 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.
package mechanical data ld39050 20/25 docid15470 rev 2 figure 36. dfn6 (3x3 mm) drawings b&
docid15470 rev 2 21/25 ld39050 package mechanical data 25 table 8. dfn6 (3x3 mm) mechanical data dim. mm min. typ. max. a0.80 1 a1 0 0.02 0.05 a3 0.20 b0.23 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 figure 37. dfn6 (3x3 mm) footprint recommended data
packaging mechanical data ld39050 22/25 docid15470 rev 2 8 packaging mechanical data figure 38. dfn6 (3x3 mm) tape b1
docid15470 rev 2 23/25 ld39050 packaging mechanical data 25 figure 39. dfn6 (3x3 mm) reel table 9. dfn6 (3x3 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
revision history ld39050 24/25 docid15470 rev 2 9 revision history table 10. document revision history date revision changes 11-mar-2009 1 initial release. 28-feb-2014 2 the part number ld39050xx changed to ld39050. updated the title in cover page, table 1: device summary , section 1: diagrams , section 2: pin configuration , section 4: electrical characteristics , section 5: typical performance characteristics , section 6: application information and section 7: package mechanical data . deleted order code table. added section 8: packaging mechanical data . minor text changes.
docid15470 rev 2 25/25 ld39050 25 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. ? 2014 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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