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1/24 october 2003 n v o1 = 1.5, 1.8, 2.5, 2.8, 3.0, 3.3v fixed n v o2 = 1.5, 1.8, 2.5, 2.8, 3.0, 3.3v fixed or adjustable from 1.25 to v i -v drop n guaranteed output1 current: 1a n guaranteed output2 current: 1a n 2% output tolerance (at 25c) n 3% output tolerance over temp. n typical dropout 1.1v (i o1 =i o2 =1a) n internal power and thermal limit n stable with low esr output capacitor n operating temperature range: 0c to 125c n very low quiescent current: 7ma max over temp. n available in ppak, spak and in dfn 5x6mm package description specifically designed for data storage applications, this device integrates two voltage regulators, each one able to supply 1a and it is assembled in ppak, in spak and in a new 8-pin surface mounting package named dfn 5x6mm at 8 pins. the first regulator block supplies 1.5v, 1.8v, 2.5v, 2.8v, 3.0v, 3.3v depending on the chosen version. the second one may be fixed to the same values or adjustable from 1.25v to v i - v drop that could power several kind of different micro-controllers. both outputs are current limited and over temperature protected. it is worth underlining the very good thermal performance of the packages spak and dfn with only 2c/w of thermal resistance junction to case. applications are hard disk, cd/dvd-rom, cd/ dvd-r/rw, combo (dvd-rom+cd-r/rw). st2l05 very low quiescent current dual voltage regulator block diagram of fixed/adj version ppak dfn spak-5l
st2l05 2/24 block diagram of fixed/fixed version
st2l05 3/24 ordering codes (*) available on request. (1) for tube shipment, change "r" with "-" in the relevant ordering code, dfn is available only in tape & reel. v o1 v o2 spak ppak dfn shipment (1) 1.5 v 1.5 v st2l05r1515k5 (*) st2l05r1515pt (*) st2l05r1515ps (*) tape & reel 1.5 v 1.8 v st2l05r1518k5 (*) st2l05r1518pt (*) st2l05r1518ps (*) tape & reel 1.5 v 2.5 v st2l05r1525k5 (*) st2l05r1525pt (*) st2l05r1525ps (*) tape & reel 1.5 v 2.8 v st2l05r1528k5 (*) st2l05r1528pt (*) st2l05r1528ps (*) tape & reel 1.5 v 3.0 v st2l05r1530k5 (*) st2l05r1530pt (*) st2l05r1530ps (*) tape & reel 1.5 v 3.3 v st2l05r1533k5 (*) st2l05r1533pt (*) st2l05r1533ps (*) tape & reel 1.5 v adj st2l05r1500k5 (*) st2l05r1500pt st2l05r1500ps (*) tape & reel 1.8 v 1.5 v st2l05r1815k5 (*) st2l05r1815pt (*) st2l05r1815ps (*) tape & reel 1.8 v 1.8 v st2l05r1818k5 (*) st2l05r1818pt (*) st2l05r1818ps (*) tape & reel 1.8 v 2.5 v st2l05r1825k5 (*) st2l05r1825pt st2l05r1825ps (*) tape & reel 1.8 v 2.8 v st2l05r1828k5 (*) st2l05r1828pt (*) st2l05r1828ps (*) tape & reel 1.8 v 3.0 v st2l05r1830k5 (*) st2l05r1830pt (*) st2l05r1830ps (*) tape & reel 1.8 v 3.3 v st2l05r1833k5 (*) st2l05r1833pt (*) st2l05r1833ps (*) tape & reel 1.8 v adj st2l05r1800k5 (*) st2l05r1800pt st2l05r1800ps (*) tape & reel 2.5 v 1.5 v st2l05r2515k5 (*) st2l05r2515pt (*) st2l05r2515ps (*) tape & reel 2.5 v 1.8 v st2l05r2518k5 (*) st2l05r2518pt (*) st2l05r2518ps (*) tape & reel 2.5 v 2.5 v st2l05r2525k5 (*) st2l05r2525pt (*) st2l05r2525ps (*) tape & reel 2.5 v 2.8 v st2l05r2528k5 (*) st2l05r2528pt (*) st2l05r2528ps (*) tape & reel 2.5 v 3.0 v st2l05r2530k5 (*) st2l05r2530pt (*) st2l05r2530ps (*) tape & reel 2.5 v 3.3 v st2l05r2533k5 (*) st2l05r2533pt (*) st2l05r2533ps (*) tape & reel 2.5 v adj st2l05r2500k5 (*) st2l05r2500pt st2l05r2500ps (*) tape & reel 2.8 v 1.5 v st2l05r2815k5 (*) st2l05r2815pt (*) st2l05r2815ps (*) tape & reel 2.8 v 1.8 v st2l05r2818k5 (*) st2l05r2818pt (*) st2l05r2818ps (*) tape & reel 2.8 v 2.5 v st2l05r2825k5 (*) st2l05r2825pt (*) st2l05r2825ps (*) tape & reel 2.8 v 2.8 v st2l05r2828k5 (*) st2l05r2828pt (*) st2l05r2828ps (*) tape & reel 2.8 v 3.0 v st2l05r2830k5 (*) st2l05r2830pt (*) st2l05r2830ps (*) tape & reel 2.8 v 3.3 v st2l05r2833k5 (*) st2l05r2833pt (*) st2l05r2833ps (*) tape & reel 2.8 v adj st2l05r2800k5 (*) st2l05r2800pt (*) st2l05r2800ps (*) tape & reel 3.0 v 1.5 v st2l05r3015k5 (*) st2l05r3015pt (*) st2l05r3015ps (*) tape & reel 3.0 v 1.8 v st2l05r3018k5 (*) st2l05r3018pt (*) st2l05r3018ps (*) tape & reel 3.0 v 2.5 v st2l05r3025k5 (*) st2l05r3025pt (*) st2l05r3025ps (*) tape & reel 3.0 v 2.8 v st2l05r3028k5 (*) st2l05r3028pt (*) st2l05r3028ps (*) tape & reel 3.0 v 3.0 v st2l05r3030k5 (*) st2l05r3030pt (*) st2l05r3030ps (*) tape & reel 3.0 v 3.3 v st2l05r3033k5 (*) st2l05r3033pt (*) st2l05r3033ps (*) tape & reel 3.0 v adj st2l05r3000k5 (*) st2l05r3000pt (*) st2l05r3000ps (*) tape & reel 3.3 v 1.5 v ST2L05R3315K5 (*) st2l05r3315pt (*) st2l05r3315ps (*) tape & reel 3.3 v 1.8 v st2l05r3318k5 (*) st2l05r3318pt st2l05r3318ps (*) tape & reel 3.3 v 2.5 v st2l05r3325k5 (*) st2l05r3325pt st2l05r3325ps tape & reel 3.3 v 2.8 v st2l05r3328k5 (*) st2l05r3328pt (*) st2l05r3328ps (*) tape & reel 3.3 v 3.0 v st2l05r3330k5 (*) st2l05r3330pt (*) st2l05r3330ps (*) tape & reel 3.3 v 3.3 v st2l05r3333k5 (*) st2l05r3333pt (*) st2l05r3333ps (*) tape & reel 3.3 v adj st2l05r3300k5 st2l05r3300pt st2l05r3300ps tape & reel
st2l05 4/24 absolute maximum ratings (*) storage temperatures > 125c are only acceptable if the dual regulator is soldered to a pcba. absolute maximum ratings are those beyond which damage to the device may occur. functional operation under these condition is not im- plied. recommended operating conditions thermal data connection diagram (top view for ppak and spak, top thr ough view for dfn8) pin description symbol parameter value unit v i operating input voltage 10 v p d power dissipation internally limited i osh short circuit output current - 3.3 v and adjustable output internally limited t op operating junction temperature range 0 to 150 c t stg storage temperature range (*) -65 to 150 c t lead lead temperature (soldering) 10 sec. 260 c symbol parameter value unit v i input voltage 4.5 to 7 v d v i input voltage ripple 0.15 v t rise input voltage rise time (from 10% to 90%) 3 1 sec t fall input voltage fall time (from 10% to 90%) 3 1 sec symbol parameter spak dfn ppak unit r thj-case thermal resistance junction-case 228c/w r thj-amb thermal resistance junction-ambient 26 36 100 c/w dfn8 ppak spak ppak/spak dfn symbol name and function 13v i bypass with a 4.7f capacitor to gnd 2 4 adj/n.c. resistor divider connection/not connected 3 8 gnd ground 45v o2 adjustable output voltage: bypass with a 4.7f capacitor to gnd 57v o1 fixed output voltage: bypass with a 4.7f capacitor to gnd 1, 2, 6 nc not connected
st2l05 5/24 application circuit of fixed/fixed version application circuit of fixed/adj version note: the regulator is designed to be stable with either tantalum or ceramic capacitors on the input and outputs. the expected values of the input and output x7r ceramic capacitors are from 4.7f to 22f with 4.7f typical. the input capacitor must be connected within 0.5 inches of the v i terminal. the output capacitors must also be connected within 0.5 inches of output pins v o1 and v o2 . there is no upper limit to the size of the input capacitor (for more details see the application hints section). note: in the fixed/adj version, the adjustable output voltage v o2 is designed to support output voltages from 1.25v to v i -v drop .the adjustable output voltage v o2 is set by a resistor divider connected between v o2 (pin4) and ground (pin3) with its centre tap connected to v o2 adj (pin2). the voltage divider resistors are: r 1 connected to v o2 and v o2 adj and r 2 connected to v o2 adj and gnd. v o2 is deter- mined by v ref ,r 1 ,r 2 , and i adj as follows (for more details see the application hints section): v o2 =v ref (1+r 1 /r 2 )+i adj r 1
st2l05 6/24 output1 and output2 dual specification (i o =10mato1a,t j = 0 to 125c, v i =4.5vto7v, c i =4.7f,c o1 =c o2 =4.7 m f, otherwise specified) electrical characteristics of fixed output 1.5v (i o =10mato1a,t j = 0 to 125c, v i =4.5vto7v,c i = 4.7f, c o1 =c o2 =4.7 m f, otherwise specified) note 1: bandwidth of 10 hz to 10khz. note 2: 120hz input ripple. note 3: c i = 20f, c 1 and c o2 = 10f. c i ,c o1 and c o2 are all x7r ceramic capacitors. note 4: guaranteed by design, not tested in production. note 5: % undershoot or overshoot of v o . symbol parameter test conditions min. typ. max. unit i gnd quiescent current (fixed/adj) v i 7v i out1,2 = 5ma to 1a 5 ma i gnd quiescent current (fixed/fixed) v i 7v i out1,2 = 5ma to 1a 7 ma i st total current limit i o1 +i o2 2a t shdn thermal shutdown 175 c dt shdn thermal shutdown hysteresis 5 c symbol parameter test conditions min. typ. max. unit v o output voltage 1.5v i o = 5ma to 1a, v i = 4.75 to 5.25v t = 25c 1.47 1.5 1.53 v v o output voltage 1.5v i o = 5ma to 1a, v i = 4.75 to 5.25v 1.455 1.5 1.545 v d v o line regulation v i = 4.75 to 5.25v, i o = 5ma to 1a 15 mv d v o load regulation v i = 4.75v, i o = 10ma to 1a 12 mv v d dropout voltage d v o = -1% i o = 1a 1.3 v i s current limit v i = 5.5v 1 a i omin min output current for regulation 0ma e n rms output noise (1)(4) t = 25c 0.003 % svr supply voltage rejection (2)(4) v i =5v 60 db d v o / d i o transient response change of v o with step load change (3)(4) v i =5v, i o = 1ma to 1a, t r 3 1s 10 (5) % v i =5v, i o =1ato1ma, t f 3 1s 10 (5) d v o1 / d v i transient response change of v out1 with application of v i (3)(4) 0 to 5v step input, i o = 1ma to 1a, t r 3 1s 10 (5) % d v o / d i o transient response short circuit removal response (3)(4) v i =5v, i o = short to i o = 10ma 20 (5) % t r thermal regulation (4) i o = 1a, t pulse = 30ms 0.1 %/w s temperature stability (4) 0.5 % s long term stability (4) (1000hrs) t j = 125c 0.3 %
st2l05 7/24 electrical characteristics of fixed output 1.8v (i o =10mato1a,t j = 0 to 125c, v i =4.5vto7v,c i = 4.7f, c o1 =c o2 =4.7 m f, otherwise specified) note 1: bandwidth of 10 hz to 10khz. note 2: 120hz input ripple. note 3: c i = 20f, c 1 and c o2 = 10f. c i ,c o1 and c o2 are all x7r ceramic capacitors. note 4: guaranteed by design, not tested in production. note 5: % undershoot or overshoot of v o . symbol parameter test conditions min. typ. max. unit v o output voltage 1.8v i o = 5ma to 1a, v i = 4.75 to 5.25v t = 25c 1.764 1.8 1.836 v v o output voltage 1.8v i o = 5ma to 1a, v i = 4.75 to 5.25v 1.746 1.8 1.854 v d v o line regulation v i = 4.75 to 5.25v, i o = 5ma to 1a 15 mv d v o load regulation v i = 4.75v, i o = 10ma to 1a 12 mv v d dropout voltage d v o = -1% i o = 1a 1.3 v i s current limit v i = 5.5v 1 a i omin min output current for regulation 0ma e n rms output noise (1)(4) t = 25c 0.003 % svr supply voltage rejection (2)(4) v i =5v 60 db d v o / d i o transient response change of v o with step load change (3)(4) v i =5v, i o = 1ma to 1a, t r 3 1s 10 (5) % v i =5v, i o =1ato1ma, t f 3 1s 10 (5) d v o1 / d v i transient response change of v out1 with application of v i (3)(4) 0 to 5v step input, i o = 1ma to 1a, t r 3 1s 10 (5) % d v o / d i o transient response short circuit removal response (3)(4) v i =5v, i o = short to i o = 10ma 20 (5) % t r thermal regulation (4) i o = 1a, t pulse = 30ms 0.1 %/w s temperature stability (4) 0.5 % s long term stability (4) (1000hrs) t j = 125c 0.3 %
st2l05 8/24 electrical characteristics of fixed output 2.5v (i o =10mato1a,t j = 0 to 125c, v i =4.5vto7v,c i = 4.7f, c o1 =c o2 =4.7 m f, otherwise specified) note 1: bandwidth of 10 hz to 10khz. note 2: 120hz input ripple. note 3: c i = 20f, c 1 and c o2 = 10f. c i ,c o1 and c o2 are all x7r ceramic capacitors. note 4: guaranteed by design, not tested in production. note 5: % undershoot or overshoot of v o . symbol parameter test conditions min. typ. max. unit v o output voltage 2.5v i o = 5ma to 1a, v i = 4.75 to 5.25v t = 25c 2.45 2.5 2.55 v v o output voltage 2.5v i o = 5ma to 1a, v i = 4.75 to 5.25v 2.425 2.5 2.575 v d v o line regulation v i = 4.75 to 5.25v, i o = 5ma to 1a 15 mv d v o load regulation v i = 4.75v, i o = 10ma to 1a 12 mv v d dropout voltage d v o = -1% i o = 1a 1.3 v i s current limit v i = 5.5v 1 a i omin min output current for regulation 0ma e n rms output noise (1)(4) t = 25c 0.003 % svr supply voltage rejection (2)(4) v i =5v 60 db d v o / d i o transient response change of v o with step load change (3)(4) v i =5v, i o = 1ma to 1a, t r 3 1s 10 (5) % v i =5v, i o =1ato1ma, t f 3 1s 10 (5) d v o1 / d v i transient response change of v out1 with application of v i (3)(4) 0 to 5v step input, i o = 1ma to 1a, t r 3 1s 10 (5) % d v o / d i o transient response short circuit removal response (3)(4) v i =5v, i o = short to i o = 10ma 20 (5) % t r thermal regulation (4) i o = 1a, t pulse = 30ms 0.1 %/w s temperature stability (4) 0.5 % s long term stability (4) (1000hrs) t j = 125c 0.3 %
st2l05 9/24 electrical characteristics of fixed output 2.8v (i o =10mato1a,t j = 0 to 125c, v i =4.5vto7v,c i = 4.7f, c o1 =c o2 =4.7 m f, otherwise specified) note 1: bandwidth of 10 hz to 10khz. note 2: 120hz input ripple. note 3: c i = 20f, c 1 and c o2 = 10f. c i ,c o1 and c o2 are all x7r ceramic capacitors. note 4: guaranteed by design, not tested in production. note 5: % undershoot or overshoot of v o . symbol parameter test conditions min. typ. max. unit v o output voltage 2.8v i o = 5ma to 1a, v i = 4.75 to 5.25v t = 25c 2.744 2.8 2.856 v v o output voltage 2.8v i o = 5ma to 1a, v i = 4.75 to 5.25v 2.716 2.8 2.884 v d v o line regulation v i = 4.75 to 5.25v, i o = 5ma to 1a 15 mv d v o load regulation v i = 4.75v, i o = 10ma to 1a 12 mv v d dropout voltage d v o = -1% i o = 1a 1.3 v i s current limit v i = 5.5v 1 a i omin min output current for regulation 0ma e n rms output noise (1)(4) t = 25c 0.003 % svr supply voltage rejection (2)(4) v i =5v 60 db d v o / d i o transient response change of v o with step load change (3)(4) v i =5v, i o = 1ma to 1a, t r 3 1s 10 (5) % v i =5v, i o =1ato1ma, t f 3 1s 10 (5) d v o1 / d v i transient response change of v out1 with application of v i (3)(4) 0 to 5v step input, i o = 1ma to 1a, t r 3 1s 10 (5) % d v o / d i o transient response short circuit removal response (3)(4) v i =5v, i o = short to i o = 10ma 20 (5) % t r thermal regulation (4) i o = 1a, t pulse = 30ms 0.1 %/w s temperature stability (4) 0.5 % s long term stability (4) (1000hrs) t j = 125c 0.3 %
st2l05 10/24 electrical characteristics of fixed output 3.0v (i o =10mato1a,t j = 0 to 125c, v i =4.5vto7v,c i = 4.7f, c o1 =c o2 =4.7 m f, otherwise specified) note 1: bandwidth of 10 hz to 10khz. note 2: 120hz input ripple. note 3: c i = 20f, c 1 and c o2 = 10f. c i ,c o1 and c o2 are all x7r ceramic capacitors. note 4: guaranteed by design, not tested in production. note 5: % undershoot or overshoot of v o . symbol parameter test conditions min. typ. max. unit v o output voltage 3.0v i o = 5ma to 1a, v i = 4.75 to 5.25v t = 25c 2.94 3.0 3.06 v v o output voltage 3.0v i o = 5ma to 1a, v i = 4.75 to 5.25v 2.91 3.0 3.09 v d v o line regulation v i = 4.75 to 5.25v, i o = 5ma to 1a 15 mv d v o load regulation v i = 4.75v, i o = 10ma to 1a 12 mv v d dropout voltage d v o = -1% i o = 1a 1.3 v i s current limit v i = 5.5v 1 a i omin min output current for regulation 0ma e n rms output noise (1)(4) t = 25c 0.003 % svr supply voltage rejection (2)(4) v i =5v 60 db d v o / d i o transient response change of v o with step load change (3)(4) v i =5v, i o = 1ma to 1a, t r 3 1s 10 (5) % v i =5v, i o =1ato1ma, t f 3 1s 10 (5) d v o1 / d v i transient response change of v out1 with application of v i (3)(4) 0 to 5v step input, i o = 1ma to 1a, t r 3 1s 10 (5) % d v o / d i o transient response short circuit removal response (3)(4) v i =5v, i o = short to i o = 10ma 20 (5) % t r thermal regulation (4) i o = 1a, t pulse = 30ms 0.1 %/w s temperature stability (4) 0.5 % s long term stability (4) (1000hrs) t j = 125c 0.3 %
st2l05 11/24 electrical characteristics of fixed output 3.3v (i o =10mato1a,t j = 0 to 125c, v i =4.5vto7v,c i = 4.7f, c o1 =c o2 =4.7 m f, otherwise specified) note 1: bandwidth of 10 hz to 10khz. note 2: 120hz input ripple. note 3: c i = 20f, c 1 and c o2 = 10f. c i ,c o1 and c o2 are all x7r ceramic capacitors. note 4: guaranteed by design, not tested in production. note 5: % undershoot or overshoot of v o . symbol parameter test conditions min. typ. max. unit v o output voltage 3.3v i o = 5ma to 1a, v i = 4.75 to 5.25v t = 25c 3.234 3.3 3.366 v v o output voltage 3.3v i o = 5ma to 1a, v i = 4.75 to 5.25v 3.2 3.3 3.4 v d v o line regulation v i = 4.75 to 5.25v, i o = 5ma to 1a 15 mv d v o load regulation v i = 4.75v, i o = 10ma to 1a 12 mv v d dropout voltage d v o = -1% i o = 1a 1.3 v i s current limit v i = 5.5v 1 a i omin min output current for regulation 0ma e n rms output noise (1)(4) t = 25c 0.003 % svr supply voltage rejection (2)(4) v i =5v 60 db d v o / d i o transient response change of v o with step load change (3)(4) v i =5v, i o = 1ma to 1a, t r 3 1s 10 (5) % v i =5v, i o =1ato1ma, t f 3 1s 10 (5) d v o1 / d v i transient response change of v out1 with application of v i (3)(4) 0 to 5v step input, i o = 1ma to 1a, t r 3 1s 10 (5) % d v o / d i o transient response short circuit removal response (3)(4) v i =5v, i o = short to i o = 10ma 20 (5) % t r thermal regulation (4) i o = 1a, t pulse = 30ms 0.1 %/w s temperature stability (4) 0.5 % s long term stability (4) (1000hrs) t j = 125c 0.3 %
st2l05 12/24 electrical characteristics of adjustable output (i o = 10ma to 1a, t j = 0 to 125c, v i =4.5vto7v,c i = 4.7f, c o1 =c o2 =4.7 m f, otherwise specified) note 1: bandwidth of 10 hz to 10khz. note 2: 120hz input ripple. note 3: c i = 20f, c 1 and c o2 = 10f. c i ,c o1 and c o2 are all x7r ceramic capacitors. note 4: guaranteed by design, not tested in production. note 5: % undershoot or overshoot of v o . application hints external capacitors like any low-dropout regulator, the st2l05 requires external capacitors for stability. we suggest soldering both capacitors as close as possible to the relative pins (1, 4 and 5). input capacitor an input capacitor, whose value is, at least, 2.2f is required; the amount of the input capacitance can be increased without limit if a good quality tantalum or aluminium capacitor is used.smd x7r or y5v ceramic multilayer capacitors could not ensure stability in any condition because of their variable characteristics with frequency and temperature; the use of this capacitor is strictly related to the use of the output capacitors. for more details read the output capacitor section.the i nput capacitor must be located at a distance of not more than 0.5" from the input pin of the device and returned to a clean analog ground. output capacitor the st2l05 is designed specifically to work with ceramic and tantalum capacitors.special care must be taken when a ceramic multilayer capacitor is used.due to their characteristics they can sometimes have an esr value lower than the minimum required by the st2l05 and their relatively large capacitance can symbol parameter test conditions min. typ. max. unit v o reference voltage i o = 5ma to 1a, v i = 4.75 to 5.25v, t = 25c 1.225 1.25 1.275 v v o reference voltage i o = 5ma to 1a, v i = 4.75 to 5.25v 1.212 1.25 1.287 v d v o2 line regulation 2 v i = 4.75 to 5.25v, i o = 5ma to 1a 0.35 % d v o2 load regulation 2 v i = 4.75v, i o = 10ma to 1a 0.4 % v d dropout voltage d v o = -1% i o = 1a 1.3 v i s current limit v i = 5.5v 1 a i adj adjustable current (sinking) 1 a i d adj adjustable current change i o = 10ma to 1a 200 na i omin min output current for regulation 2ma e n rms output noise (1)(4) t = 25c 0.003 % svr supply voltage rejection (2)(4) v i =5v 60 db d v o2 / d i o2 transient response change of v o1 with step load change (3)(4) v i =5v, i o = 1ma to 1a, t r 3 1s 10 (5) % v i =5v, i o =1ato1ma, t f 3 1s 10 (5) d v o2 / d v i transient response change of v out1 with application of v i (3)(4) 0 to 5v step input, i o = 1ma to 1a, t r 3 1s 10 (5) % d v o2 / d i o2 transient response short circuit removal response (3)(4) v i =5v, i o = short to i o = 10ma 20 (5) % t r thermal regulation (4) i o = 1a, t pulse = 30ms 0.1 %/w s temperature stability (4) 0.5 % s long term stability (4) (1000hrs) t j = 125c 0.3 %
st2l05 13/24 change a lot depending on the ambient temperature.the test results of the st2l05 stability using multilayer ceramic capacitors show that a minimum value of 2.2f is needed for both regulators. this value can be increased without limit if the input capacitor value is major or equal to 4.7f, and up to 10f if the input capacitor is minor than 4.7f.surface-mountable solid tantalum capacitors offer a good combination of small physical size for the capacitance value and esr in the range needed by the st2l05. the test results show good stability for both outputs with values of at least 1f. the value can be increased without limit for even better performance such as transient response and noise. important: the output capacitor must maintain its esr in the stable region over the full operating temperature to assure stability. more over, capacitor tolerance and variations due to temperature must be considered to assure that the minimum amount of capacitance is provided at all times. for this reason, when a ceramic multilayer capacitor is used, the better choice for temperature coefficient is the x7r type, which holds the capacitance within 15%. the output capacitor should be located not more than 0.5" from the output pins of the device and returned to a clean analog ground. adjustable regulator the st2l05 has a 1.25v reference voltage between the output and the adjust pins (respectively pin 4 and 2). when a resistor r 1 is placed between these two terminals, a constant current flows through r 1 and down to r 2 to set the overall (v o2 to gnd) output voltage. minimum load current is 2ma max in all temperature conditions. application circuit v o =v ref (1+r 1 /r 2 )+i adj r 1 i adj is very small (typically 35a) and constant: in the v o calculation it can be ignored.
st2l05 14/24 typical characteristics figure 1 : reference voltage vs temperature figure 2 : reference line regulation vs temperature figure 3 : reference load regulation vs temperature figure 4 : reference voltage vs input voltage figure 5 : dropout voltage vs temperature (adjustable output) figure 6 : dropout voltage vs input voltage (adjustable output)
st2l05 15/24 figure 7 : minimum load current vs temperature (adjustable output) figure 8 : adjust pin current vs temperature (adjustable output) figure 9 : output voltage vs temperature figure 10 : line regulation vs temperature figure 11 : load regulation vs temperature figure 12 : output voltage vs input voltage
st2l05 16/24 figure 13 : dropout voltage vs temperature (fixed output) figure 14 : dropout voltage vs input voltage figure 15 : supply voltage rejection vs temperature figure 16 : supply voltage rejection vs frequency figure 17 : quiescent current vs temperature (fixed/adj version) figure 18 : quiescent current vs temperature (fixed/fixed version)
st2l05 17/24 figure 19 : short circuit removal response figure 20 : change of v o with step load change figure 21 : change of v o with step load change figure 22 : change of v o with step load change figure 23 : short circuit removal response figure 24 : change of v o with step load change v i =5 v , i o =s h ort c i rcu i tto 10 m a , c o = 10 m f , c i = 22 m f a ll ceram i c x5r, t j =25c v i =5 v , i o = 1 m a to 1a , c o = 10 m f , c i = 22 m f a ll ceram i c x 5 r , t j =25c v i =5 v , i o = 1 m a to 1a , c o = 10 m f , c i = 22 m f a ll ceram i c x 5 r , t j =25c, t rise =1s v i =5 v , i o = 1a to 1 m a , c o = 10 m f , c i = 22 m f a ll ceram i c x 5 r , t j =25c, t fall =1s v i =5 v , i o =s h ort c i rcu i tto 10 m a , c o = 10 m f , c i = 22 m f a ll ceram i c x5r, t j =25c v i =5 v , i o = 1 m a to 1a , c o = 10 m f , c i = 22 m f a ll ceram i c x 5 r , t j =25c, t rise =1s
st2l05 18/24 figure 25 : change of v o with step load change figure 26 : change of v o with step load change figure 27 : start-up transient figure 28 : start-up transient v i =5 v , i o = 1 m a to 1a , c o = 10 m f , c i = 22 m f a ll ceram i c x 5 r , t j =25c, t rise =t fall =1s v i =5 v , i o = 1a to 1 m a , c o = 10 m f , c i = 22 m f a ll ceram i c x 5 r , t j =25c, t fall =1s v i = 0 to 5 v , i o = 1 m a , c o = 10 m f , c i = 22 m f a ll ceram i c x 5 r , t j = 2 5 c , t rise 1s v i = 0 to 5 v , i o = 1a , c o = 10 m f , c i = 22 m f a ll ceram i c x 5 r , t j = 2 5 c , t rise 1s
st2l05 19/24 dim. mm. inch min. typ max. min. typ. max. a 1.78 2.03 0.070 0.080 a2 0.03 0.13 0.001 0.005 c 0.25 0.010 c1 0.25 0.010 d 1.02 1.27 0.040 0.050 d1 7.87 8.13 0.310 0.320 f 0.63 0.79 0.025 0.031 g 1.69 0.067 g1 6.8 0.268 h1 5.59 0.220 h2 9.27 9.52 0.365 0.375 h3 8.89 9.14 0.350 0.360 l 10.41 10.67 0.410 0.420 l1 7.49 0.295 l2 8.89 9.14 0.350 0.360 m 0.79 1.04 0.031 0.041 n 0.25 0.010 v3? 6?3? 6? spak-5l mechanical data po13f1/b
st2l05 20/24 dim. mm. inch min. typ max. min. typ. max. a 2.2 2.4 0.086 0.094 a1 0.9 1.1 0.035 0.043 a2 0.03 0.23 0.001 0.009 b 0.4 0.6 0.015 0.023 b2 5.2 5.4 0.204 0.212 c 0.45 0.6 0.017 0.023 c2 0.48 0.6 0.019 0.023 d 6 6.2 0.236 0.244 e 6.4 6.6 0.252 0.260 g 4.9 5.25 0.193 0.206 g1 2.38 2.7 0.093 0.106 h 9.35 10.1 0.368 0.397 l2 0.8 0.031 l4 0.6 1 0.023 0.039 ppak mechanical data 0078180-b
st2l05 21/24 dim. mm. inch min. typ max. min. typ. max. a 0.80 0.90 1.00 0.032 0.035 0.039 a1 0.02 0.005 0.001 0.002 a3 0.20 0.008 b 0.35 0.40 0.47 0.014 0.016 0.018 d 5.00 0.197 d2 4.15 4.2 4.25 0.163 0.165 0.167 e 6.00 0.236 e2 3.55 3.6 3.65 0.140 0.142 0.144 e 1.27 0.049 f 1.99 0.078 g 2.20 0.086 h 0.40 0.015 i 0.219 0.0086 l 0.70 0.90 0.028 0.035 dfn8 (5x6) mechanical data 7286463/b
st2l05 22/24 dim. mm. inch min. typ max. min. typ. max. a 180 7.086 c 12.8 13.0 13.2 0.504 0.512 0.519 d 20.2 0.795 n 60 2.362 t 14.4 0.567 ao 9.70 9.80 9.90 0.382 0.386 0.390 bo 10.85 10.95 11.05 0.423 0.427 0.431 ko 2.30 2.40 2.50 0.090 0.094 0.098 po 3.9 4.0 4.1 0.153 0.157 0.161 p 11.9 12.0 12.1 0.468 0.472 0.476 tape & reel spak-xl mechanical data
st2l05 23/24 dim. mm. inch min. typ max. min. typ. max. a 330 12.992 c 12.8 13.0 13.2 0.504 0.512 0.519 d 20.2 0.795 n 60 2.362 t 14.4 0.567 ao 6.80 6.90 7.00 0.268 0.272 0.2.76 bo 10.40 10.50 10.60 0.409 0.413 0.417 ko 2.55 2.65 2.75 0.100 0.104 0.105 po 3.9 4.0 4.1 0.153 0.157 0.161 p 7.9 8.0 8.1 0.311 0.315 0.319 tape & reel dpak-ppak mechanical data
st2l05 24/24 information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result f rom its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specificati ons mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of stmicroelectronics. the st logo is a registered trademark of stmicroelectronics all other names are the property of their respective owners ? 2003 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 - singapore - spain - sweden - switzerland - united kingdom - united states. http://www.st.com

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