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data sheet rev. 3.0 / august 2011 zled700 2 toggle (side-step) dual-channel led driver
zled7002 toggle (side-step) dual-channel led driver ? 2011 zentrum mikroelektronik dresden ag rev. 3.0 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. the information furnished in this publication is su bject to changes without notice. brief description the zled7002 toggle (side-step) dual-channel led driver is one of our zled family of led control ics. it operates in the lower dc voltage supply range of 2. 7v to 5.5v. this unique led driver is capable of controlli ng a main channel and a sub channel. typically, only one of the two channels is active and the zled7002 toggles between the channels automatically in response to t he voltage supply level and the related voltage at the uv (under-voltage protection) pin. a high-to-low transi tion of the power supply causes the output current to switc h from the main channel to the sub channel if the uv pin voltage (v uv-pin ) is below the zled7002s under-voltage threshold (v uvthrsh =1.17v, typical). a low-to-high tran- sition switches the output current from the sub chann el to the main channel if the uv pin voltage is 80mv ( typi- cal) above the under-voltage threshold. the main channel is a configurable constant current source driving the main led string with a maximum current draw of 250ma. the main led channel current is set by an external resistor (r3) connected to th e iset pin. alternately, the sub channel is activated when th e zled7002s sub pin is pulled to ground. its current i s determined by the forward voltage of the sub led and external components. the sub channel can drive up to 100ma current through the led channel when active. the zled7002 enables voltage-level indicator applica - tions and low-power battery-driven lighting applica tions that require switching to a lower-current led channe l when the supply is low, which extends the lighting life- time. because the dropout voltage (v dp ) is minimal (as low as 0.1v when the main channel output current is ~200ma), the zled7002 is optimal for battery-powered applications. capable of operating efficiently with dc voltage supplies ranging from 2.7v to 5.5v, it is ide al for small portable lighting applications. the zled7002 can also reduce bill-of-material costs because very few external components are required f or most applications, making it an optimal fit for sma ll devices for which lighting lifetime is critical. on ly four resistors, a diode, and a capacitor are needed for a typical basic application. features automatic main channel short-circuit protection switches the output current to the sub channel if the main led is shorted under-voltage power supply detection over-temperature protection benefits extends lighting life-time by switching to a lower - current led channel when the supply is low 80mv (typical) hysteresis prevents unintended switching activation due to power supply ripple ultra low quiescent current: 250 a typical very few external components needed for operation available support evaluation kit physical characteristics voltage supply: 2.7v to 5.5v dc operating temperature: -25c to 85c small sop8 package for additional information on our zled driver family , visit www.zmdi.com/products/led-drivers/ zled7002 typical application circuit
zled7002 toggle (side-step) dual-channel led driver ? 2011 zentrum mikroelektronik dresden ag rev. 3.0 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. sop8 package dimensions and pin assignments dimension (mm, except ) symbol min max a 1.350 1.750 a1 0.100 0.250 a2 1.450 typical b 0.350 0.490 c 0.178 0.250 d 4.800 5.000 e 3.800 4.000 e1 5.800 6.240 e 1.270 typical l 0.400 1.270 0 8 ordering information product sales code description package zled7002-zi1r zled7002 C toggle (side-step) dual-channel led driver so p8 (tape & reel) ZLED7002KIT-E1 zled7002 evaluation kit kit sales and further information www.zmdi.com led_drivers@zmdi.com zentrum mikroelektronik dresden ag (zmd ag) grenzstrasse 28 01109 dresden germany zmd america, inc. 8413 excelsior drive suite 200 madison, wi 53717 usa zentrum mikroelektronik dresden ag, japan office 2nd floor, shinbashi tokyu bldg. 4-21-3, shinbashi, minato-ku tokyo, 105-0004 japan zmd far east, ltd. 3f, no. 51, sec. 2, keelung road 11052 taipei taiwan phone +49 (0)351.8822.7.533 fax +49 (0)351.8822.8.7533 phone +1 (608) 829-1987 fax +1 (631) 549-2882 phone +81.3.6895.7410 fax +81.3.6895.7301 phone +886.2.2377.8189 fax +886.2.2377.8199 disclaimer : this information applies to a product under devel opment. its characteristics and specifications are subject to change without notice. zentrum mikroelek tronik dresden ag (zmd ag) assumes no obligation regarding future manufacture unless otherwise agree d to in writing. the information furnished hereby i s believed to be true and accurate. however, under no circumstances shall zmd ag be liable to any custo mer, licensee, or any other third party for any special, indirect, in cidental, or consequential damages of any kind or n ature whatsoever arising out of or in any way relat ed to the furnishing, performance, or use of this t echnical data. zmd ag hereby expressly disclaims any liability of zmd ag to any customer, licensee or any other third party, and any such customer, licensee and any other thir d party hereby waives any liability of zmd ag for a ny damages in connection with or arising out of the furnishing, p erformance or use of this technical data, whether b ased on contract, warranty, tort (including neglige nce), strict liability, or otherwise . typical applications battery-driven led lighting including helmet lighting bicycle lighting miner lamps pocket lights voltage-level indicators general purpose low-voltage industrial and consumer led applications
zled7002 toggle (side-step) dual-channel led driver data sheet august 10, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.3.0 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 4 of 13 contents 1 ic characteristics ................................. ................................................... ................................................... ................... 5 1.1. absolute maximum ratings ............................ ................................................... ................................................... . 5 1.2. operating conditions ............................... ................................................... ................................................... ........ 5 1.3. electrical parameters................................ ................................................... ................................................... ....... 5 1.4. typical performance graphs .......................... ................................................... ................................................... . 6 2 circuit description ................................ ................................................... ................................................... ................... 7 2.1. zled7002 overview................................... ................................................... ................................................... ..... 7 2.2. under-voltage threshold............................. ................................................... ................................................... .... 8 2.3. main led current .................................... ................................................... ................................................... ........ 8 2.4. sub led current...................................... ................................................... ................................................... ........ 8 2.5. zled7002 protection features......................... ................................................... .................................................. 9 2.5.1. over-temperature protection ......................... ................................................... ............................................. 9 2.5.2. main led short-circuit protection ..................... ................................................... .......................................... 9 3 application circuit design.......................... ................................................... ................................................... ............ 10 3.1. applications........................................ ................................................... ................................................... ............ 10 3.2. application circuit layout requirements ............. ................................................... ............................................. 10 4 esd protection........................................ ................................................... ................................................... .............. 11 5 pin configuration and package ........................ ................................................... ................................................... ..... 11 6 ordering information ............................... ................................................... ................................................... .............. 13 7 document revision history .......................... ................................................... ................................................... ......... 13 list of figures figure 1.1 iset pin voltage versus temperature (+10c to 100c) ................................................... .............................. 6 figure 1.2 main led current versus power supply (4v to 5.4v dc) .... ................................................... ....................... 7 figure 3.1 basic zled7002 application circuit ................... ................................................... ....................................... 10 figure 5.1 zled7002 pin configuration........................... ................................................... .......................................... 11 figure 5.2 sop8 package drawing.................................. ................................................... .......................................... 12 list of tables table 5.1 zled7002 pin descriptions and connection requirements sop8 package ......................................... ... 11 table 5.2 sop8 package dimensions ............................... ................................................... ....................................... 12
zled7002 toggle (side-step) dual-channel led driver data sheet august 10, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.3.0 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 5 of 13 1 ic characteristics 1.1. absolute maximum ratings no. parameter symbol conditions min typ max unit 1.1.1 input voltage v cc -0.3 6.5 v 1.1.2 iset pin voltage v iset -0.3 6.5 v 1.1.3 uv pin voltage v uv-pin -0.3 6.5 v 1.1.4 main pin voltage v main -0.3 6.5 v 1.1.5 sub pin voltage v sub -0.3 6.5 v 1.1.6 main pin current i main_abs 500 ma 1.1.7 sub pin current i sub_abs 300 ma 1.1.8 esd performance p tot human body model 4 kv 1.1.9 junction temperature t j 150 c 1.1.10 storage temperature t s -60 150 c 1.2. operating conditions no. parameter symbol conditions min typ max unit 1.2.1 operating temperature t amb -25 +85 c 1.2.2 input voltage v cc 2.7 5.5 v 1.3. electrical parameters except as noted, conditions for the following speci fications are t amb = -25c to +85c (25c typical); v cc = 2.7v to 5.5v. production testing of the chip is performed at 25c; v cc =3.6v, unless otherwise stated. functional operation of the chip and specified parameters at other temperatures are guar anteed by design, characterization, and process con trol. no. parameter symbol conditions min typ max unit 1.3.1 quiescent current i cc 2.7 v cc 5.5; 1.4 < v uv-pin < 5.5; no load 250 320 ua 1.3.2 i main to i iset ratio -- v cc = 4.2v, r3 = 30k 8000 1.3.3 iset pin voltage v iset 1.2 v 1.3.4 main led current accuracy -- v cc = 2.7v; v main =0.5v 5 % 1.3.5 dropout voltage C main channel current source v dp iout=204ma, rset=47k 0.2 v 1.3.6 on resistance C sub channel r sub 2.7v vcc 5.5v 2.0 1.3.7 uv pin under-voltage threshold v uvthrsh switches from main led to sub led if v uv-pin tran- sitions from high to low voltage and v uv-pin is lower than v uvthrsh . 1.13 1.17 1.21 v
zled7002 toggle (side-step) dual-channel led driver data sheet august 10, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.3.0 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 6 of 13 no. parameter symbol conditions min typ max unit 1.3.8 uv pin comparator hysteresis (upper threshold C under- voltage threshold) v uvhys switches from sub led to main led if v uv-pin transitions from low voltage to high voltage and v uv-pin is higher than v uvthrsh + v uvhys (the upper threshold). 80 mv 1.3.9 thermal protection threshold t sd 160 c 1.3.10 junction-to-ambient temperature r ja 128 c/w 1.3.11 main pin current i main 250ma ma 1.3.12 sub pin current i sub 100ma ma 1.4. typical performance graphs figure 1.1 iset pin voltage versus temperature (+10 c to 100c) v iset temperature
zled7002 toggle (side-step) dual-channel led driver data sheet august 10, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.3.0 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 7 of 13 figure 1.2 main led current versus power supply (4v to 5.4v dc) 2 circuit description 2.1. zled7002 overview the zled7002 is an led driver for two channels design ated as the main channel and the sub channel. typical ly, only one of the channels is on and the other is off. external resistors r1 and r2 connected to uv pin form a volt age divider across the power supply. when the power supply voltage has ris en high enough to create a voltage at the uv pin tha t is above a set threshold, the main led channel is activated and the sub channel is off. if the supply falls and the resu lting voltage at the uv pin is below the threshold, the sub channel becomes a ctive and the main channel is turned off. when the main channel is active, the zled7002 provid es a constant current source for driving the main led channel. its current level is set by an external resistor (r3) b etween the iset and gnd pins (see section 2.3). whe n the sub led channel is active, its current is determined by external co mponents (see section 2.4) and the zled7002 pulls th e sub pin to ground. refer to the application circuit in figure 3.1 for the location of the components referred to in the f ollowing sections. i main (ma) v dc (volts)
zled7002 toggle (side-step) dual-channel led driver data sheet august 10, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.3.0 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 8 of 13 ?? ? ?? ? + = - 2r 1r 2r v v cc pin uv ?? ? ?? ? = 3r v 8000 i iset main 2.2. under-voltage threshold the zled7002s uv pin enables under-voltage detection . when a high-to-low transition occurs on the power supply voltage and the voltage at the uv pin falls below the under- voltage threshold (typically 1.17v), the zled7002 aut omatically turns off the main led channel and actives the sub channel. there is an 80mv hysteresis for the under-voltage thresho ld to prevent unintended activation due to power supply ripple. w hen a low-to-high transition occurs on the power su pply voltage, the sub channel is turned off and the main channel is activ ated if the uv pin voltage is 80mv (typical) above t he under-voltage threshold. the voltage at the uv pin (v uv-pin ) is determined by the ratio of the external resist ors r1 and r2 (see figure 3.1), which connect to the uv pin to form a voltage divider acro ss the power supply. v uv-pin can be calculated with equation (1): (1) if the values for r1 and r2 are low, high current w ill flow through them resulting in lower system eff iciency. typical values for r1 and r2 are in the magnitude of 10 5 ; e.g., 51k . for design purposes, it is helpful to select the value for r2 first and then compute r1 as needed to achieve the target ratio. for applications using a lithium battery, which typ ically maintains ~3.7v during its discharge stage, s etting v uv-pin to 3.4v is recommended. 2.3. main led current the r3 resistor connected between the iset and gnd pins determines the level of the constant current t hrough the main led channel, which is typically 8000 times the current of the iset pin. the voltage at the iset pin is a c onstant 1.2v, which is unaffected by environmental temperature and any pow er supply voltage changes as shown in figure 1.1 an d figure 1.2. the main led current flows through the main pin to gro und, so voltage dropout is minimal (as low as 0.1v w hen the main channel current is 200ma). note: system efficiency is reduced if the power supp ly voltage is larger than the main leds voltage. in this case, the additional voltage is added to the main pin voltage. the main led channel current (i main ) is calculated via equation (2): (2) 2.4. sub led current the sub led channel current is determined by the ext ernal r4 resistor in series with the connected sub l ed string, the sub led forward voltage, and the voltage drop across the d1 zener diode connected from the cathode of the su b led to the sub pin. when the sub channel is active, its current flow s through the sub pin to ground.
zled7002 toggle (side-step) dual-channel led driver data sheet august 10, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.3.0 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 9 of 13 ?? ? ?? ? - - = - 4r v v v i 1fd led fsub cc sub the sub led channel current (i sub ) is calculated via equation (3): (3) where v fsub-led = the forward voltage of the sub led v fd1 = the forward voltage of zener diode d1, which should be as small as possible 2.5. zled7002 protection features 2.5.1. over-temperature protection the zled7002 includes protection from damage due to over-temperature conditions. the zled7002 automatica lly turns off if its temperature is 160c (typical). if the temperature returns to 140c, the zled7002 turns on and continues normal operation. 2.5.2. main led short-circuit protection the zled7002 will detect a short-circuit on the main led. in this case, the zled7002 automatically turns o ff the main led channel and activates the sub led channel.
zled7002 toggle (side-step) dual-channel led driver data sheet august 10, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.3.0 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 10 of 13 3 application circuit design 3.1. applications the zled7002 is designed for small battery-powered l ighting life-time critical applications. capable of operating efficiently with dc voltage supplies ranging from 2.7v to 5.5v, it is ideal for small portable lighting applications. typ ical applications include helmet lighting, head / t ail lights for bicycles, min er lamps, pocket lights, and various other general purpose low-voltage industrial and consumer led applications. figure 3.1 basic zled7002 application circuit 3.2. application circuit layout requirements the following guidelines are strongly recommended w hen laying out application circuits: use a 0.1 f capacitor connected between the uv pin and ground to minimize noise picked up on the uv pin. place the capacitor close to the uv pin. if the application includes a switch as shown in fi gure 3.1, locate it at the lowest voltage point to avoid sparks when switching. use traces that are as short and wide as possible f or any traces leading to actual ground that occur b etween the gnd pin and iset pin. this improves accuracy for the mai n led current and the under-voltage threshold. also see table 5.1 for connection requirements.
zled7002 toggle (side-step) dual-channel led driver data sheet august 10, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.3.0 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 11 of 13 4 esd protection all pins have an esd protection of 3 4000v according the human body model (hbm). the es d test follows the human body model with 1.5 k /100 pf based on mil 883-g, method 3015.7. 5 pin configuration and package figure 5.1 zled7002 pin configuration table 5.1 zled7002 pin descriptions and connection r equirementssop8 package pin no. description (also see section 3.2 for layout guidelines) v cc 1 power supply (2.7v to 5.5v). uv 2 under-voltage detection input. i set 3 input for external resistor that sets the current for the main led channel. nc 4 no connection. nc 5 no connection. gnd 6 connect to ground. main 7 main channel constant current source. connect to cathode of main led. sub 8 sub channel current sink. connect to cathode of d1 (zener diode) connected to cathode of sub led.
zled7002 toggle (side-step) dual-channel led driver data sheet august 10, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.3.0 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 12 of 13 figure 5.2 sop8 package drawing table 5.2 sop8 package dimensions dimension (mm) dimension (mm, except ) symbol min max symbol min max a 1.350 1.750 e 3.800 4.000 a1 0.100 0.250 e1 5.800 6.240 a2 1.450 typical e 1.270 typical b 0.350 0.490 l 0.400 1.270 c 0.178 0.250 0 8 d 4.800 5.000
zled7002 toggle (side-step) dual-channel led driver data sheet august 10, 2011 ? 2011 zentrum mikroelektronik dresden ag rev.3.0 all rights reserved. the material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. t he information furnished in this publication is subject to changes without notice. 13 of 13 6 ordering information 7 document revision history revision date description 1.0 15 july, 2011 first issue. 3.0 10 august, 2011 third issue. aligned file and re vision numbers. product sales code description package zled7002-zi1r zled7002 C toggle (side-step) dual-channel led driver so p8 (tape & reel) ZLED7002KIT-E1 zled7002 evaluation kit kit sales and further information www.zmdi.com led_drivers@zmdi.com zentrum mikroelektronik dresden ag (zmd ag) grenzstrasse 28 01109 dresden germany zmd america, inc. 8413 excelsior drive suite 200 madison, wi 53717 usa zentrum mikroelektronik dresden ag, japan office 2nd floor, shinbashi tokyu bldg. 4-21-3, shinbashi, minato-ku tokyo, 105-0004 japan zmd far east, ltd. 3f, no. 51, sec. 2, keelung road 11052 taipei taiwan phone +49 (0)351.8822.7.533 fax +49 (0)351.8822.8.7533 phone +1 (608) 829-1987 fax +1 (631) 549-2882 phone +81.3.6895.7410 fax +81.3.6895.7301 phone +886.2.2377.8189 fax +886.2.2377.8199 disclaimer : this information applies to a product under devel opment. its characteristics and specifications are subject to change without notice. zentrum mikroelek tronik dresden ag (zmd ag) assumes no obligation regarding future manufacture unless otherwise agree d to in writing. the information furnished hereby i s believed to be true and accurate. however, under no circumstances shall zmd ag be liable to any custo mer, licensee, or any other third party for any special, indirect, in cidental, or consequential damages of any kind or n ature whatsoever arising out of or in any way relat ed to the furnishing, performance, or use of this t echnical data. zmd ag hereby expressly disclaims any liability of zmd ag to any customer, licensee or any other third party, and any such customer, licensee and any other thir d party hereby waives any liability of zmd ag for a ny damages in connection with or arising out of the furnishing, p erformance or use of this technical data, whether b ased on contract, warranty, tort (including neglige nce), strict liability, or otherwise .
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