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data sheet rev. 1.0 / november 2010 zled7012 low-voltage four-channel led driver
zled7012 low-voltage four-channel led driver ? 2010 zentrum mikroelektronik dresden ag - rev. 1.0 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 subject to changes without notice. brief description the zled7012, one of our zled family of led control ics, is a low-noise, constant-frequency charge pump dc/dc converter that can drive up to four led channels, providing a programmable constant current level ranging from 1.8ma to 20ma per led channel. it can also drive higher current leds because its current sinks can operate in parallel. it enables white or other color led applications that require uniform intensity and/or linear progressions in brightness. capable of operating efficiently with dc voltage supplies ranging from 2.8v to 5.5v, it is ideal for small, battery-powered applications because very few external components are needed: typically one small-dimension 1 f capacitor across the c+ and c- pins and two small-dimension 2.2 f capacitors to gnd from the vcc and vout pins. the zled7012?s pulse count control (pcc) serial digi- tal input is used to enable/disable the leds and set the current level (14 settings using a nearly logarithmic scale to provide a linear brightness progression). this simple, high-speed interface allows efficient real-time management of leds via mi crocontrollers or control systems. the zled7012?s features include integrated soft-start circuitry to protect against excessive in-rush current dur- ing power-on and a low-current shutdown mode that reduces quiescent current consumption to approximately 1 a (typical) by disconnecting the load from the input when the en/set pin is low for a specified time. features ? low quiescent current in low-current shutdown mode: 1 a typical; <2 a maximum ? integrated thermal shutdo wn protection prevents damage by shutting down the zled7012 if the die junction temperature exceeds 160c (typical) ? fixed charge pump switching frequency: 1mhz (typ.) ? soft-start feature protects against excessive inrush current during power-on benefits ? current matching accuracy: 0.9% (typical) ? one-pin on/off or brightne ss control for up to four leds via a simple pcc serial interface?no pulse- width modulation or additional control circuit needed ? 14 programmable current levels for achieving real- time control of effects such as led fade-out or sudden changes in brightness ? low emi and back-injected noise because the charge pump is not inductor-based ? very few external components needed for operation ? flexible design enables diverse led applications: up to 20ma per channel ? led driver family concept with low-voltage six-channel led driver zled7022 available support ? evaluation kit physical characteristics ? voltage supply: 2.8v to 5.5v dc ? operating temperat ure: -40c to 85c ? small footprint 12-pin utqfn package (2mm2mm) zled7012 application circuit
zled7012 low-voltage four-channel led driver ? 2010 zentrum mikroelektronik dresden ag ? rev. 1.0 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. block diagram t ypical applications ? led backlighting for portable devices ? led lighting for cell phones, smartphones. pdas ? illumination of digital photo frames ? backlighting for gps / navigation systems ? low voltage led lighting fixtures ? general purpose low-voltage indust rial and consumer applications ordering information product sales code description package ZLED7012-ZI1R zled7012 ? low-voltage four-channel led driver utqfn12 (2x2)mm tape & reel zled7012kit-e1 zled7012 evaluation board 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 development. its characteristics and specifications are subject to change without notice. zentrum mikroelektronik dresden ag (zmd ag) assumes no obligation regarding future manufacture unless otherwise agreed to in writing. the information furnished hereby is believed to be true and accurate. however, under no circumstances shall zmd ag be liable to any customer, licensee, or any other third party for any special, indirect, incidental, or consequential damages of any kind or nature whatsoever arising out of or in any way related to the furnishing, performance, or use of this technical data. zmd ag hereby expressly disclaims any liability of zmd ag to any customer, licensee or any other third party, and any such customer, l icensee and any other third party hereby waives any liability of zmd ag for any damages in connection with or arising out of the furnishing, performance or use of this technical data, whether based on contract, warrant y, tort (including negligence), strict liability, or otherwise .
zled7012 low-voltage four-channel led driver data sheet november 9, 2010 ? 2010 zentrum mikroelektronik dresden ag ? rev. 1.0 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 subject to changes without notice. 4 of 15 contents 1 ic characte ristics ............................................................................................................. ............................................. 6 1.1. absolute maxi mum rati ngs ................................................................................................................................... 6 1.2. operating c onditio ns ........................................................................................................... .................................. 6 1.3. electrical parameters.......................................................................................................... ................................... 6 1.4. typical perfor mance gr aphs ..................................................................................................... ............................ 7 2 circuit de scripti on ............................................................................................................ ............................................. 9 2.1. block di agram ........................................................................................................................................................ 9 2.2. zled7012 ov erview.............................................................................................................. ................................ 9 2.3. zled7012 soft-sta rt feature .................................................................................................... .......................... 10 2.4. zled7012 low-current shutdown mode ............................................................................................. ............... 10 2.5. led current control ............................................................................................................ ................................ 10 2.6. pcc serial digi tal inte rface ................................................................................................... .............................. 11 3 operating c onditio ns................................................................................................................................................... 11 3.1. rf noise re duction............................................................................................................. ................................ 11 3.2. zled7012 therma l protection.................................................................................................... ......................... 11 4 application cir cuit de sign............................................................................................................................................ 12 4.1. applicat ions.......................................................................................................................................................... 12 4.2. external co mponents ............................................................................................................ .............................. 12 4.2.1. external capacito rs cout and cin............................................................................................... .................. 12 4.2.2. external pump capac itor ........................................................................................................ ...................... 12 4.2.3. leds ........................................................................................................................... .................................. 13 4.3. unused led driver pins ......................................................................................................... ............................. 13 5 esd prot ection............................................................................................................................................................ 13 6 pin configurati on and pa ckage .................................................................................................. ................................. 13 7 ordering in formati on ................................................................................................................................................... 15 8 glossary ...................................................................................................................................................................... 15 9 document revi sion hist ory ...................................................................................................... ................................... 15
zled7012 low-voltage four-channel led driver data sheet november 9, 2010 ? 2010 zentrum mikroelektronik dresden ag ? rev. 1.0 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 subject to changes without notice. 5 of 15 list of figures figure 1.1 operating current i cc over supply voltage v cc range (2.8v to 5.5v) at 25c .............................................. 7 figure 1.2 led current over supply voltage v cc range (2.8v to 5.5v) for outputs d0:d3 (led0:led3) ..................... 8 figure 1.3 shutdown current i sd over supply voltage v cc range (2.8v to 5.5v) ........................................................... 8 figure 1.4 current i cc over temperature range (-40c to +85c) .................................................................................. 8 figure 1.5 efficiency (%) over the v cc range (2.8v to 5.5v) at 25c ............................................................................. 9 figure 2.1 pcc serial digital interface signal timing ................................................................................................... 11 figure 4.1 basic application circuit using d2:d0 .......................................................................................................... 12 figure 6.1 pin configuration zled7012 ? top view ..................................................................................................... 13 figure 6.2 utqfn-12 package drawing ....................................................................................................................... 14 list of tables table 2.1 current output settings ............................................................................................................................... .1 0 table 6.1 layout requirements and pin descriptions?12-pin utqfn package ........................................................ 14 table 6.2 utqfn-12 package dimensions ................................................................................................................. 14
zled7012 low-voltage four-channel led driver data sheet november 9, 2010 ? 2010 zentrum mikroelektronik dresden ag ? rev. 1.0 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 subject to changes without notice. 6 of 15 1 ic characteristics 1.1. absolute maximum ratings no. parameter symbol conditions min typ max unit 1.1.1 input voltage referenced to ground v cc -0.3 6.0 v 1.1.2 en/set voltage referenced to ground v en/set -0.3 v cc +0.3 v 1.1.3 maximum soldering temperature t lead at zled7012 lead; 10 seconds maximum 300 c 1.1.4 maximum thermal resistance ja utqfn-12 package 60 c/w 1.1.5 junction temperature t j -40 150 c 1.2. operating conditions no. parameter symbol conditions min typ max unit 1.2.1 operating temperature t amb -40 +85 c 1.2.2 input voltage v cc 2.8 5.5 v 1.3. electrical parameters except as noted, conditions for t he following specifications are t amb = -40c to +85c (25c typical); v cc = 2.8v to 5.5v; cin = cout = 2.2 f; cpump = 1f production testing is at 25c. at other temp eratures within the specified operating ra nge, functional operation of the zled7012 and specified parameters are guaranteed by char acterization, design, and process control. parameters marked with an asterisk (*) are guaranteed by design. no. parameter symbol conditions min typ max unit input power supply 1.3.1 operating current i cc 2.8 v cc 5.5; i set = 20ma; no load 0.6 1.0 ma 1.3.2 current consumption in shutdown mode i shdn v en/set = 0v 1.0 2.0 a 1.3.3 current matching between channels i d-match i set = 20ma 0.9 % charge pump 1.3.4 charge pump frequency * f cp 1.0 mhz 1.3.5 soft-start time * t ss 33.0 s
zled7012 low-voltage four-channel led driver data sheet november 9, 2010 ? 2010 zentrum mikroelektronik dresden ag ? rev. 1.0 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 subject to changes without notice. 7 of 15 no. parameter symbol conditions min typ max unit en/set input (pcc seri al digital interface) 1.3.6 enable threshold low v en_l v cc = 2.8v 0.4 v 1.3.7 enable threshold high v en_h v cc = 5.5v 1.4 v 1.3.8 en/set low time t en/set_lo 0.3 75 s 1.3.9 minimum en/set high time t en/set_hi_min 50 ns 1.3.10 maximum en/set high time t en/set_hi_max 75 s 1.3.11 en/set off timeout * t off 500 s 1.3.12 en/set latch timeout * t lat 500 s 1.3.13 internal en/set pull-down resistor r en/set_down 500 k ? 1.4. typical performance graphs figure 1.1 operating current i cc over supply voltage v cc range (2.8v to 5.5v) at 25c
zled7012 low-voltage four-channel led driver data sheet november 9, 2010 ? 2010 zentrum mikroelektronik dresden ag ? rev. 1.0 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 subject to changes without notice. 8 of 15 figure 1.2 led current over supply voltage v cc range (2.8v to 5.5v) for outputs d0:d3 (led0:led3) t amb = 25c i set = 20ma figure 1.3 shutdown current i sd over supply voltage v cc range (2.8v to 5.5v) t amb = 25c figure 1.4 current i cc over temperature range (-40c to +85c)
zled7012 low-voltage four-channel led driver data sheet november 9, 2010 ? 2010 zentrum mikroelektronik dresden ag ? rev. 1.0 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 subject to changes without notice. 9 of 15 figure 1.5 efficiency (%) over the v cc range (2.8v to 5.5v) at 25c 2 cir cuit description 2.1. block diagram 2.2. zled7012 overview the zled7012 is a low-noise, constant-fre quency charge pump dc/dc converter for driv ing up to four leds with constant current at a level controlled via a pcc serial digital interf ace, providing a uniform and linear brightness progression. its 20 ma (maximum) current output per led channel is optimal for low-voltage or battery-powered applications, such as portable applications powered by 1-cell lithium batteries. the zled7012?s current sinks can operate in parallel for driving higher curre nt leds. only a few, small external components are needed for typical applications. the zled7012?s charge pump operates at a fixed frequency (1mhz typical) with minimal noise and harmonics.
zled7012 low-voltage four-channel led driver data sheet november 9, 2010 ? 2010 zentrum mikroelektronik dresden ag ? rev. 1.0 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 subject to changes without notice. 10 of 15 the current sinks [d3:d0] are controlled by the pcc serial data input on the en/set pin. data is written to an internal data register that sets the outputs to one of 14 current levels. the vout pin provides a shared supply voltage for the leds. the capacitor across the c+ and c- pins is t he ?pump capacitor? used by the charge pump. 2.3. zled7012 soft-start feature the soft-start feature protects against excessive inrush current s during the start-up of the charge pump circuit. this prevents potential transient noise effects that can affect initial performance, especially in battery-operated applications toward the e nd of the battery life. 2.4. zled7012 low-current shutdown mode the zled7012 enters a low-current shutdown mode wh enever its en/set input is held low longer than t off (500 s min- imum). in the low-current shutdown mode, the zled7012 draws minimal current (i shdn =1 a typical, 2 a maximum) and the internal data register that controls output curr ent is reset to 0, which disables the outputs. 2.5. led current control the zled7012?s pulse count control (pcc) serial digital inte rface is used to enable/disable the led outputs and set the constant current level to one of 14 settings using a nearly logarithmic scale (approximately 1.5db difference between settings) to provide a linear brightness progression as the current level increases/decreases. see table 2.1 for the current level settings. becaus e [d3:d0] are independent constant current sinks, the voltage at the led output being dr iven is determined by the led?s forward voltage (v f ). this enables accurate led brightness control and matching by the control system. table 2.1 current output settings data level current output per channel (ma) 1 20.0 2 17.0 3 14.0 4 12.0 5 10.0 6 8.6 7 7.0 8 6.0 9 5.0 10 4.2 11 3.6 12 3.0 13 2.4 14 1.8
zled7012 low-voltage four-channel led driver data sheet november 9, 2010 ? 2010 zentrum mikroelektronik dresden ag ? rev. 1.0 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 subject to changes without notice. 11 of 15 2.6. pcc serial digital interface the zled7012 detects the rising edges of the control signal in put on the en/set pin via an internal counter and decodes the signal into one of the 14 current level settings given in table 2.1 . the control signal timing can vary (even during a program- ming cycle), and its frequency can range from high data rates (e.g., 1mhz) to very low rates (e.g., 15khz). (also see section 2.4 .) after sending the constant current l evel code data, the control system hol ds the en/set signal high for time t lat (500 s minimum) so that the zled7012 latches the programmed current level code into the data register and the current level becomes active as illustrated in figure 2.1 . the internal counter is then reset to ze ro to be read y for the next programming cycle. this process is repeated for the next data sent by the control system for subsequent current level programming. see section 2.4 regarding the low-current shutdown mo d e, which is entered when the en/set signal remains low for longer than t off (500 s minimum). figure 2.1 pcc serial digital interface signal timing en/set t lo t hi t lat t off data reg 1 2 n n= 14 1 n 0 i out 3 ope rating conditions 3.1. rf noise reduction the zled7012 charge pump operates at a fi xed frequency of 1mhz (typical) to limit noise and harmonics and prevent genera- tion of rf interference by the zled7012, which could affect operation of local communication devices, such as cell phones. the soft-start feature also prevents noise transients c aused by inrush currents due to charge pump start-up. the zled7012 has significantly lower back-injected noise at the input pin of the charge pump (t ypically 60mv peak-to-peak), compared to inductor-based dc/dc boost converter solutions for whit e led backlight applications (typically 10 times higher). 3.2. zled7012 thermal protection the zled7012 includes an on-board temperature sensing circuit that shuts down the zled7012 and turns off its outputs if the die junction temperature exceeds 160c (typical).
zled7012 low-voltage four-channel led driver data sheet november 9, 2010 ? 2010 zentrum mikroelektronik dresden ag ? rev. 1.0 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 subject to changes without notice. 12 of 15 4 application circuit design 4.1. applications the zled7012 is designed for white or other color led applications requiring a controlled led cu rrent that is generated from a varying input voltage. typical applications include main/sub lcd display backlighting, cell phones (including smartphones), personal digital assistants (pdas), mp3/mp4 devices, port able media players (pmps), and general purpose low-voltage industrial applications. see section 4.2.3 for details and requirements for the leds. figure 4.1 basic application circuit using d2:d0 4.2. external components 4.2.1. external capacitors cout and cin the values and type of capacitors used for cin and cout can affe ct several circuit parameters including transient performance, turn-on time, and output ripple. use low equivalent series resistance (esr) ceramic capacitors (internal resistance < 100m ? ) for best performance, lower costs, and component size reduction . low esr capacitors can enable applications at the highest led forward voltage with the lowest supply voltage. tantal um and aluminum electrolytic are not generally recommended because the esr is typically in the range of several ohms. note: the recommended starting value when dete rmining the optimal value for cout is 2.2 f. there is often a design trade-off between low esr ratings and smaller size because physically larger ceramic capacitors usually have a relatively lower esr, which can improve the operating range of the circuit. cin is a bypass capacitor ( ? 2.2 f) essential to proper operation because it must deliver the dynamic current for the charge pump. 4.2.2. external pump capacitor the external pump capacitor cpump connected between the c+ and c- pins is an essential part of the zled7012?s internal charge pump circuit. because the zled7012 oper ates at a constant charge-pump frequency of 1mhz (t ypical), it is important that the pump capacitance is greater than 0.47 f so it can transfer enough charge each cycle to supply sufficient load current. to reduce voltage fluctuations on the supply line, do not use a value for the pump capa citor that is greater than the bypass capacitor, cin.
zled7012 low-voltage four-channel led driver data sheet november 9, 2010 ? 2010 zentrum mikroelektronik dresden ag ? rev. 1.0 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 subject to changes without notice. 13 of 15 select a pump capacitor value in the range of 0.47f to 2. 2f depending on output current requirements; 1f is recom- mended for most applications. when designing the circuit to operate at high levels of output current, choose a higher value of capacitance; low output currents do not require a large pump capacitor. as with cin and cout, low esr ceramic capacitors are recommended for the pump capacitor. see section 4.2.1 for a discussion of low esr capacitors. 4.2.3. leds the zled7012?s low dropout current sinks are capable of driving most types of leds with forward voltages as high as 4.7v at full current with a vcc input supply of 2.8v to 5.5v. high-current leds can be driven by using any of the d3:d0 pins in paralle l. the brightness of the leds being driven will matc h despite any variations in the forward voltage (v f ) of the individual leds because the [d3:d0] output current sinks are matc hed with negligible voltage dependence (see section 1.3 for specifications). 4.3. u nused led driver pins led driver pin d0 must always be used. if any of the led driv er pins [d1:d3] are unused, di sable the pin(s) by connecting them to ground to avoid noise coupling. 5 esd protection from each i/o or vcc pin to gnd, there is an esd protection of ? 3000v. between the i/o pins, there is an esd protection of ? 1000v according the human body model (hbm). the esd test follows the human body model with 1.5 k ? /100 pf based on mil 883-g, method 3015.7. 6 pin c onfiguration and package figure 6.1 pin configuration zled7012 ? top view 1 2 3 12 7 8 11 10 4 5 6 9 c- en/set gnd nc nc vcc vout d3 d2 d1 c+ d0
zled7012 low-voltage four-channel led driver data sheet november 9, 2010 ? 2010 zentrum mikroelektronik dresden ag ? rev. 1.0 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 subject to changes without notice. 14 of 15 table 6.1 layout requirements and pin descriptions?12-pin utqfn package pin name no. description d0 1 led output channel; pin must be used. vout 2 charge pump output that drives load circuits; a 2.2 f (typical) capacitor must be connected from vout to gnd pin. vcc 3 power supply input; a 2.2 f (minimum) bypass capacitor must be connected from vcc to gnd pin. c+ 4 positive terminal of external pump capacitor. c- 5 negative terminal of external pump capacitor. en/set 6 pcc serial input for enabling/disabling leds and setting current levels. gnd 7 ground. nc 8 no connection. nc 9 no connection. d3 10 led output; if not used, connect to ground to avoid noise coupling. d2 11 led output; if not used, connect to ground to avoid noise coupling. d1 12 led output; if not used, connect to ground to avoid noise coupling. figure 6.2 utqfn-12 package drawing a1 a a2 side view pin 1 d b e e bottom view t able 6.2 utqfn-12 package dimensions dimension (mm) dimension (mm) symbol min nom max symbol min nom max a 0.50 0.55 0.60 d 1.95 2.00 2.05 a1 0.00 -- 0.05 e 1.95 2.00 2.05 a2 0.25 e 0.50 b 0.20 0.25 0.30
zled7012 low-voltage four-channel led driver data sheet november 9, 2010 ? 2010 zentrum mikroelektronik dresden ag ? rev. 1.0 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 subject to changes without notice. 15 of 15 7 ordering information product sales code description package ZLED7012-ZI1R zled7012 ? low-voltage four-channel led driver utqfn12 (2x2)mm, tape & reel zled7012kit-e1 zled7012 evaluation board kit 8 glossary term description emi electromagnetic interference esr equivalent series resistance: a c apacitor parameter affected by characteristics such as component composition, size, leads, internal connections, and temperature pcc pulse count control: a serial digital interface 9 do cument revision history revision date description 1.0 november 9, 2010 official release 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 development. its characteristics and specifications are subject to change without notice. zentrum mikroelektronik dresden ag (zmd ag) assumes no obligation regarding future manufacture unless otherwise agreed to in writing. the information furnished hereby is believed to be true and accurate. however, under no circumstances shall zmd ag be liable to any customer, licensee, or any other third party for any special, indirect, incidental, or consequential damages of any kind or nature whatsoever arising out of or in any way related to the furnishing, performance, or use of this technical data. zmd ag hereby expressly disclaims any liability of zmd ag to any customer, licensee or any other third party, and any such customer, l icensee and any other third party hereby waives any liability of zmd ag for any damages in connection with or arising out of the furnishing, performance or use of this technical data, whether based on contract, warrant y, tort (including negligence), strict liability, or otherwise .
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