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SD16729 16-bit constant current led driver hangzhou silan microelectronics co.,ltd rev:1.1 2009.03.10 http://www.silan.com.cn page 1 o f 14 ssop-24-225-0.635 ssop-24-300-1.0 description SD16729 is a constant current le d driver with advanced bi-cmos technology, the constant current is determined by external resistor. it includes a 16-bit shift register, latches, the constant current driver and etc. in the output stage, ther e are 16 current sources which provide a 1-45ma constant current drive for led through bipolar device. features * output current adjustable through external resistor * data serial-in/serial-out * 16-channel constant current output * output current: 1~45ma * 30mhz clock frequency * fast output current response, enable min. width:30ns * current precision (all output are on) precision between bits between ics test condition <2% <3% output current:1~15ma applications * led screen ordering information device package marking SD16729p ssop-24-300-1.0 SD16729p SD16729s ssop-24-225-0.635 SD16729s
SD16729 block diagram absolute maximum rating (t amb =25 c) characteristics symbol ratings unit supply voltage v dd 6 v input voltage v in -0.2~v dd +0.2 v output current i out 50 ma/ch output voltage v out -0.2~ 17 v power dissipation SD16729s p d1 1.04 w power dissipation SD16729p p d2 1.32 w thermal resistance SD16729s r th(j-a)1 120 c/w thermal resistance SD16729p r th(j-a)2 94 c/w storage temperature t stg -55~+150 c operating temperature t opr -40 ~ 85 c hangzhou silan microelectronics co.,ltd rev:1.1 2009.03.10 http://www.silan.com.cn page 2 o f 14
SD16729 operating condition recommended characteristics symbol test conditions min. typ. max. unit supply voltage v dd - 3.0 - 5.5 v output voltage v out - 0.5 1 17 v i out - 1 - 45 ma/ch i oh serial-out - - 1 ma output current i ol serial-out - - -1 ma input voltage v ih - 0.76v dd - v dd + 0.15 v input voltage v il - -0.15 - 0.26v dd v clock frequency f clk cascaded - - 30 mhz latch setup time t su(l) - 5 - - ns latch hold time t h(l) 30 - - ns clock pulse width t clk 20 - - ns enable pulse width t ena i out = 20 ma, conntected to led for test 30 - - ns clock setup time t su(c) - 10 - - ns clock hold time t h(c) - 10 - - ns electrical characteristics (unless otherwise specified, t amb =25 c, v dd =3.0v-5.5v) characteristics symbol test conditions min. typ. max. unit supply voltage v dd - 3.0 - 5.5 v i out1 v dd =3.3v v out =1v 38.53 39.55 40.61 ma i out2 v dd =5.0v v out =1v r ext =470 38.53 39.55 40.61 ma i out3 v dd =3.3v v out =1v 14.81 15.25 15.69 ma i out4 v dd =5.0v v out =1v r ext =1.2k 14.81 15.25 15.69 ma i out5 v dd =3.3v v out =1v 1.5 1.55 1.6 ma output current i out6 v dd =5.0v v out =1v r ext = 12k 1.5 1.55 1.6 ma output leakage current i ok v out =15.0v - - 1 ua i out1 v out >0.7v r ext =1.2k output current precision (bit to bit) i out2 v out >0.7v r ext =12k - 1 2 % hangzhou silan microelectronics co.,ltd rev:1.1 2009.03.10 http://www.silan.com.cn page 3 o f 14
SD16729 characteristics symbol test conditions min. typ. max. unit i oh =-1.0 ma, v dd =3.3 v 3 - - v output voltage (sout) v oh i oh =-1.0 ma, v dd =5.0 v 4.7 - - v i ol =1.0 ma, v dd =3.3 v - - 0.3 v output voltage (sout) v ol i ol =1.0 ma, v dd =5.0 v - - 0.3 v output current regulation %/v dd v dd : 3.0v 5.0v - 1 2 % pull-down resistance r in(down) - 115 250 460 k ? pull-up resistance r in(up) - 115 250 460 k ? v out =15.0v, r ext =470 11.5 13.14 15 ma v out =15.0v, r ext =1.2k 4.5 5.2 6 ma supply current off i off v out =15.0v, r ext =12k 0.57 0.72 0.86 ma v out =1v, r ext =470 18 20 23 ma v out =1v, r ext =1.2k 6.5 7.95 9.5 ma i on v out =1v, r ext =12k 0.83 1.04 1.24 ma v out =1v, t amb =-40 c, r ext =470 - - 30 ma v out =1v, t amb = -40 c, r ext =1.2k - - 13 ma supply current on i on v out =1v, t amb = -40 c, r ext =12k - - 1.5 ma t plh1 clk- latch , = ?h? outn enable =?l? - 50 70 ns t plh2 latch - outn , enable =?l? - 50 70 ns t plh3 enable - outn , latch =?h? - 50 70 ns propagation delay (?l? to ?h?) t plh4 clk serial out 3 10 15 ns t phl1 clk- , latch = ?h? outn enable =?l? - 20 50 ns t phl2 latch - outn , enable =?l? - 20 50 ns t phl3 enable - outn , latch =?h? - 20 50 ns propagation delay (?h? to ?l?) t phl4 clk serial out 4 10 15 ns max. clock rise time t r - - - 500 ns max. clock fall time t f - - - 500 ns hangzhou silan microelectronics co.,ltd rev:1.1 2009.03.10 http://www.silan.com.cn page 4 o f 14
SD16729 pin configuration hangzhou silan microelectronics co.,ltd rev:1.1 2009.03.10 http://www.silan.com.cn page 5 o f 14 20 19 18 17 5 6 7 8 16 15 14 13 12 11 10 9 gnd serial-in latch out0 out1 out2 out3 out4 out8 out12 out13 out14 out15 out9 out10 out11 1 24 2 23 3 22 4 21 v dd enable serial-out r-ext out7 clock out6 out5 SD16729p/SD16729s pin description pin no. pin name i/o pin function 1 gnd -- ground 2 serial-in i shift register input pin 3 clock i clock input pin for shift register 4 latch i data strobe pin for the latch 5 ~ 20 out0 ~ out15 i/o output pins 21 enable i output enable pin (active low) 22 serial-out o shift register output pin 23 r-ext i/o external resistor connecting pin 24 vdd -- power supply function descroption in the led display applications, SD16729 can maintain al most no change in different channels or between the different chips. in the different chan nels, the current changes less than 2%, while between the different chips, the current changes less than 3%. there is only one pin connected to ground which is shared as analog ground, digital ground and power ground. it is recommended to route with min. inductance against sw itching noise and output current noise-induced ic faults. in order to obtain a good current output, the chip needs an appropriate output voltage. according to the electrical characteristics table, users can get mini mum output voltage and other related information. even in the same output current conditions, the minimu m output voltage of every part is different. . in order to avoid noise interference, the resist ance should be placed close to the pin r-ext.
SD16729 time sequence note: when latch is low, latch the data; when latch high, data is is transmitted from input to output of register; when enable is low, normal response output; when enable is high, output is not available. hangzhou silan microelectronics co.,ltd rev:1.1 2009.03.10 http://www.silan.com.cn page 6 o f 14
SD16729 sequence waveform 1. clock, serial-in, serial-out 2. clock, serial-in, latch , enable , outn hangzhou silan microelectronics co.,ltd rev:1.1 2009.03.10 http://www.silan.com.cn page 7 o f 14
SD16729 3. outn test circuit for this test circuit, t opr =25 c, v dd =v ih =3.3v/5v, v out =0.7v, v il =0v, r ext =490 ?, v l =3.0v, r l =60 ?, c l =10.5pf. hangzhou silan microelectronics co.,ltd rev:1.1 2009.03.10 http://www.silan.com.cn page 8 o f 14
SD16729 typical application circuit hangzhou silan microelectronics co.,ltd rev:1.1 2009.03.10 http://www.silan.com.cn page 9 o f 14 SD16729p/SD16729s 21 3 4 2 5 20 22 23 1 enable clock latch serial-in serial-out out15 out0 r-ext gnd cpu SD16729p/SD16729s 21 3 4 2 5 20 22 23 1 enable clock latch serial-in serial-out out15 out0 r-ext gnd scan v led =3~4(v) + - vf + - vds vo note: this circuit and corresponding parameters are just for reference, please set the parameter according to practical circuit.
SD16729 electrical characteristic curve i out is given by: i out = (v r-ext /r ext )15.2; v r-ext =1.202v where, v r-ext is voltage of r -ext , and r ext is the resistance of resistor connected to r -ext . power dissipation (pd) max. power dissipation is given by: p d(max) =(t j -t a )/r th(j-a) and actual power dissipation when 16 channel are all on is expressed as: p d(act) =(i dd x v dd )+(i out x duty x v ce x16). hence, to make p d(act ) p d(max) , output current and duty cycle should be: i out = { [(t j -t a )/ r th(j-a) ]-(i dd x v dd ) } /v ce /duty/16, where t j =150 c. hangzhou silan microelectronics co.,ltd rev:1.1 2009.03.10 http://www.silan.com.cn page 10 of 14
SD16729 all the parameters are just for refer ence, please test for your design. hangzhou silan microelectronics co.,ltd rev:1.1 2009.03.10 http://www.silan.com.cn page 11 of 14
SD16729 package outline ssop-24-225-0.635 unit: mm hangzhou silan microelectronics co.,ltd rev:1.1 2009.03.10 http://www.silan.com.cn page 12 of 14 0.635 8.65 0.20 0.25 0.05 0.30 0.25 ssop-24-300-1.0 unit: mm 6.0 0.2 7.9 0.3 13.5max 13.0 0.2 1.8 0.21.8 0.2 2.2max 0.1 + 0.1 - 0.05 0.4 1.0 1.0 7.62 0.525 0.2 0.2 + 0.1 - 0.05
SD16729 mos devices operate notes: electrostatic charges may exist in many things. please take following preventive measures to prevent effectively the mos electric circuit as a result of the damage which is caused by discharge: ? the operator must put on wrist strap which should be earthed to against electrostatic. ? equipment cases should be earthed. ? ? all tools used during assembly, including sol dering tools and solder baths, must be earthed. ? mos devices should be packed in antistatic /conductive containers for transportation. disclaimer: ? silan reserves the right to make changes to the information herein for the improvement of the design and performance without further notice! ? all semiconductor products malfunction or fail with some probability under special conditions. when using silan products in system design or complete machine manufacturing, it is the responsibility of the buyer to comply with the safety standards strictly and take essential measures to avoid situations in which a malfunction or failure of such silan products could cause loss of body injury or damage to property. ? silan will supply the best possible product for customers! hangzhou silan microelectronics co.,ltd rev:1.1 2009.03.10 http://www.silan.com.cn page 13 of 14

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