elektronische bauelemente ssmg501 series low power constant current led driver 11-dec-2009 rev. b page 1 of 4 http://www.secosgmbh.com/ any changes of specification will not be informed i ndividually. rohs compliant product a suffix of -c specifies halogen or lead -free description ssmg501 is a simple general purpose current regulat ion component that can be easily used in various le d lighting applications. with the excellent load/line regulation and minimized chip current skew, ssmg50 1 keep leds current very stable even when power or load fluctua te in a wide range and make intensity very unifor m in large area of led light source. except power supply function, the vdd pin of ssmg50 1 is output enable (oe) also, and can be used in di gital pwm controlled circuit to achieve more precise curr ent adjusting in gray level applications. the minimized power supply voltage let ssmg501 be u sed as a current regulative diode (crd) when vdd an d vp pin are tight together. this application makes s smg501 very easy to be used. just like a diode, whe n this diode is inserted in led series, the current in circuit i s regulated. in high supply voltage and low led load voltage app lication, two or more single channel ssmg501 can be connected in series to share redundant high voltage . the extra redundant voltage can be share by each ssmg501 by a reasonable mechanism. this special capability let ssmg501 very suit for the usage of wide range powe r supply that many liner type led drivers cannot work. features 18ma~30ma constant current regulator self power structure, no extra power supply is nee ded 0.4v~17v output voltage 2 s/2 s current rising/falling time cascade-able for higher voltage application no external current setting resistor is needed 1.6v~12v supply voltage pwm dimming by v dd pin -40 ~120 junction operating temperature less than 1%/v load(or line) regulation applications general led lighting led back lighting led torch/flashing rgb lighting marking code ssmg501-18: 1a18 SSMG501-20: 1a20 ssmg501-25: 1a25 ssmg501-30: 1a30 note: 18, 20, 25, 30 = output current(ma) package information weight: 0.07800g (approximately) sot - 23 millimeter millimeter ref. min. max. ref. min. max. a 2.70 3.10 g 0.09 0.18 b 2.10 3.00 h 0.45 0.70 c 1.20 1.80 j 0.08 0.25 d 0.89 1.40 k - - e 1.78 2.04 l 0.89 1.02 f 0.30 0.50 top view a l c b d g h j f k e 1 2 3 1 2 3
elektronische bauelemente ssmg501 series low power constant current led driver 11-dec-2009 rev. b page 2 of 4 http://www.secosgmbh.com/ any changes of specification will not be informed i ndividually. block diagrams per channel and ideal i v characteristics terminal description pin name function pin # v dd power supply 2 v p current in 1 v n current out 3 absolute maximum ratings (t a = 25c) parameter symbol ratings unit supply voltage v dd 0 ~ 17 v output voltage v p -0.2 ~ 20 v output current i pn is** +10% ma power dissipation p d 250 mw thermal resistance r ja 300 /w operating temperature t opr -40 ~ +85 storage temperature t stg -55 ~ +150 electrical characteristics and recommended operatin g conditions parameter symbol condition min typ max unit supply voltage v dd room temp. 1.6 - 12 v supply current i dd - 100 150 250 a v dd =5v, i p i P s ** 0.4 - 17 v v dd =3v, i p i P s ** 0.45 - 17 v output voltage v p v dd =1.7v, i p i P s ** 1.2 - 17 v output current i s spec 15 - 30 ma leakage i leakage 0.4v > v dd > 0v, v p =15v 1 - 5 a line regulation %/v dd 12v > v dd > 1.6v - - 1 %/v load regulation %/v p 10v > v p > 1.6v - - 1 %/v thermal regulation %/10 v dd =vp=2v - - 0.5 %/10 threshold voltage v iboost i p =is*1.1 11 12 13 v current boost i boost v p =viboost 7 10 13 %* is ** i s is output saturation current. switching characteristics (t a = 25c) parameter symbol condition min typ max unit propagation delay time vdd l h t plh vp=1v, vdd=0v 3v - 1 - s output current rising time t rise vp=1v, vdd=0v 3v - 1.5 5 s propagation delay time vdd h l t phl vp=1v, vdd=3v 0v - 1 - s output current falling time t fall vp=1v, vdd=3v 0v - 1.5 5 s
elektronische bauelemente ssmg501 series low power constant current led driver 11-dec-2009 rev. b page 3 of 4 http://www.secosgmbh.com/ any changes of specification will not be informed i ndividually. test circuit timing waveform characteristic curve 1axx load regulation output voltage v pn (v) output current i pn (ma) 25 20 15 10 5 0 0 2 4 6 8 10 12 14 16 17 line regulation supply voltage v dd (v) output current i pn (ma) 25 20 15 10 5 0 1 1.1 1.3 1.4 1.5 2 3 4 5 6 7 8 10 12 14 v pn =2v center current =20ma i dd vs. v dd (room temp.) supply voltage v dd (v) i dd ( a) 180 160 140 120 100 80 60 40 20 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 6 7 8 9 10 12 15 16 17 i dd vs. temperature temperature ( ) i dd ( a) 250 200 150 100 50 0 -40 0 30 50 70 90 110 120 130
elektronische bauelemente ssmg501 series low power constant current led driver 11-dec-2009 rev. b page 4 of 4 http://www.secosgmbh.com/ any changes of specification will not be informed i ndividually. application circuits 5v pwm lighting application high voltage drop application 12v lighting application parallel application 36v lighting application led v f = 3.3 v ~ 3.5 v v dd = 35.5 v ~ 40 v 1axx 1axx 1axx 1axx 1axx 1axx
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