elektronische bauelemente stp1117sxx series 1.0a low dropout positive adjustable or fixed-mode regulator 27-jun-2017 rev. b page 1 of 6 http://www.secosgmbh.com/ any changes of specification will not be informed i ndividually. adj (gnd) ?[ ?[?[ ?[ vout ?\ ?\?\ ?\ vin ?] ?]?] ?] xx:vout a: adj 25: 2.5v 12: 1.2v 33: 3.3v 18: 1.8v the last letter(s) of part no. denote the output voltage rohs compliant product a suffix of -c specifies halogen free description the stp1117sxx series of positive adjustable and fixed regulators are designed to provide 1a with hi gh efficiency. all internal circuitry is designed to o perate down to 1.4v input to output differential. on-chip trimming adjusts the reference voltage to 1%. current limit the typical value of 1.5a all ows to minimizing the stress on both the regulator and the power source circuitry under overload condition s. features adjustable or fixed output 1.2v,1.8v,2.5v,3.3v output current of 1a low dropout, 1.2 v typ. at 1a output current 0.04% line regulation 0.2 % load regulation 100% thermal limit burn-in fast transient response applications high efficiency linear regulators post regulators for switching supplies adjustable power supply marking package information package mpq leader size sot-223 3k 13 inch typical application circuit part number marking stp1117sa 1117sa stp1117s12 1117s12 stp1117s18 1117s18 stp1117s25 1117s25 STP1117S33 1117s33 sot-223 top view 1 2 3 4 a m b d l k f g h j e c millimeter millimeter ref. min. max. ref. min. max. a 5.90 6.70 g - 0.18 b 6.70 7.30 h 2.00 ref. c 3.30 3.80 j 0.20 0.40 d 1.40 1.90 k 1.10 ref. e 4.45 4.75 l 2.30 ref. f 0.60 0.85 m 2.80 3.20
elektronische bauelemente stp1117sxx series 1.0a low dropout positive adjustable or fixed-mode regulator 27-jun-2017 rev. b page 2 of 6 http://www.secosgmbh.com/ any changes of specification will not be informed i ndividually. aboslute maximum ratings parameter symbol value unit input voltage v i 20 v minimum esd rating (hbm) v esd 3 kv lead temperature (soldering, 10sec.) t l 300 c thermal resistance ambient ambient r jc 15 c/w operating junction temperature range t j -40~+125 c storage temperature range t stg -65~+150 c note: stresses above those listed in absolute maximum ra tings may cause permanent damage to the device. th is is a stress only rating and operation of the device at these or any other condi tions above those indicated in the operational sect ions of this specification is not implied. functional block diagram
elektronische bauelemente stp1117sxx series 1.0a low dropout positive adjustable or fixed-mode regulator 27-jun-2017 rev. b page 3 of 6 http://www.secosgmbh.com/ any changes of specification will not be informed i ndividually. electrical characteristics (i load =0ma, t j =25c unless otherwise specified ) parameter symbol device min. typ. max unit test conditions operating voltage 4 v in - - 16 v 1.232 1.250 1.268 i load =10ma, v in =5v reference voltage 1 v iroc adj 1.225 1.250 1.275 v i load =10ma to1a, 1.5v v in -v out 10v 4 -1.5 - 1.5 v in =v out =1.5v, variator from nominal v out all fixed version -2 - 2 output voltage 1 v o v out =1.2v -3 - 2 % 1.5v v in -v out 10v, i load =0ma to 1a, variator from nominal v out 4 output voltage accuracy @wafer testing v o all -0.6 0 0.6 % v in =v out =1.5v, i load =10ma line regulation lnr all - 0.04 0.238 % i load =10ma, 1.5v v in -v out 10v 4 load regulation 1 ldr all - 0.2 0.25 % v in =v out =1.5v, i load =10ma to1a 4 minimum load current i l adj - 2 7 ma v in =5v, v adj =0v 4 ground pin current all fixed version - 35 10 ma v in =v out =1.5v, i load =10ma to1a 4 adjust pin current adj - 35 60 ua i load =10ma, 1.5v v in -v out 10v 4 current limit all 1 1.5 2 a v in -v out =1.5v 4 ripple rejection 2 rr all 60 - - db v in -v out =2.5v, i load =1a dropout voltage 1.3 v d all - 1.2 1.4 v i load =1a 4 temperature coefficient all - - 0.015 %/c v in -v out =1.5v, i load =10ma 4 notes: 1. low duty pulse testing with kelvin connections r equired. 2. 120hz input ripple (c adj for adj = 25 f). 3. v out , v ref =1% 4. the specifications which apply over the full t emperature range: ?40c tj 125c.
elektronische bauelemente stp1117sxx series 1.0a low dropout positive adjustable or fixed-mode regulator 27-jun-2017 rev. b page 4 of 6 http://www.secosgmbh.com/ any changes of specification will not be informed i ndividually. typical characteristics
elektronische bauelemente stp1117sxx series 1.0a low dropout positive adjustable or fixed-mode regulator 27-jun-2017 rev. b page 5 of 6 http://www.secosgmbh.com/ any changes of specification will not be informed i ndividually. typical characteristics
elektronische bauelemente stp1117sxx series 1.0a low dropout positive adjustable or fixed-mode regulator 27-jun-2017 rev. b page 6 of 6 http://www.secosgmbh.com/ any changes of specification will not be informed i ndividually. application information output voltage the stp1117s develops a 1.25v reference voltage between the output and the adjust terminal. by plac ing a resistor between these two terminals, a constant current is cause to flow through r1 and down through r2 to set the overall output voltage. normally, this current is c hosen to be the specified minimum load current of 10ma . for fi xed voltage devices r1 and r2 are included in the device. load regulation when the adjustable regulator is used, load regulat ion will be limited by the resistance of the wire conne cting the regulator to the load. the data sheet specification foe load regulation is measured at the output pin of the dev ice. best load regulation is obtained when the top o f the resistor divider (r1) is tied directly to the outpu t pin of the device not to the load. for fixed voltage, devices the top of r1 is internally connected to the output, and th e ground pin can be connected to low side of the load. if r1 is connected to the load, r p is multiplied by the divider ratio, the effective resistance between the regulator and the load would be: r p (1 + r2/r1), r p = parasitic line resistance input capacitor an input capacitor of 10 f or greater is recommended. tantalum or aluminum electrolytic capacitors can be used for bypassing. larger values will improve ripple reject ion by bypassing the input to the regulator. output capacitor the stp1117s requires an output capacitor to mainta in stability and improve transient response. proper capacitor selection is important to ensure proper o peration. the stp1117s output capacitor selection i s dependent upon the esr (equivalent series resistance) of the output capacitor to maintain stability. when the ou tput capacitor is 10 f or greater, the output capacitor should have an e sr less than 1 . this will improve transient response as well as promote stability. a low-esr so lid tantalum capacitor works extremely well and pro vides good transient response and stability over temperat ure. aluminum electrolytics can also be used, as long as the esr of the capacitor is <1 . the value of the output capacitor can be increased without limit. higher ca pacitance values help to improve transient response and ripple rejection and reduce output noise. ripple rejection the curves for ripple rejection were generated usin g an adjustable device with the adjust pin bypassed . with a 25 f bypassing capacitor, 75db ripple rejection is obt ainable at any output level. the impedance of the adjust pin capacitor, at the ripple frequency, should be |
