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? semiconductor components industries, llc, 2010 january, 2010 ? rev. 2 1 publication order number: cat4002b/d cat4002b, CAT4003B, cat4004b constant current programmable led driver with 32 dimming levels description the cat4002b, CAT4003B and cat4004b provide respectively two, three and four matched low dropout current sources to drive leds. the cat400xb requires no external rset resistor; the led current is internally set to 25 ma when the device is first enabled. each led channel includes an individual control loop allowing the device to handle a wide range of led forward voltages while still maintaining tight current matching. the en/dim logic input supports the device enable and a digital dimming interface for setting the led channel current with 32 linear dimming levels. leds can be powered directly from a lithium ? ion battery due to the low dropout (75 mv at 20 ma) current sinks. package options are available including the 4 ? channel tiny 8 ? pad udfn 2 mm x 2 mm with a max height of 0.55 mm, and 2 or 3 ? channel in the 6 ? lead tsot ? 23 and sc ? 70. features ? 2, 3, 4 led current sinks with tight matching ? 32 dimming levels ? low dropout driver 75 mv at 20 ma ? no switching noise ? shutdown current less than 1 a ? 25 ma max led current per channel ? dimming via 1 ? wire ezdim interface ? thermal shutdown protection ? rohs compliant ? 6 ? lead tsot ? 23, sc ? 70, and 8 ? pad udfn 2 mm x 2 mm packages typical applications ? lcd display backlight ? cellular phones ? digital still cameras http://onsemi.com see detailed ordering information on page 2 of this data sheet. ordering information sc70 ? 6 sd suffix case 419ad tsot23 ? 6 td suffix case 419af udfn ? 8 hu2 suffix case 517aw typical application circuit gnd vin 2.4 v to 5.5 v en/dim cat4002b vin 1 f led1 led2 one wire programming 32 steps c in
cat4002b, CAT4003B, cat4004b http://onsemi.com 2 marking diagrams tsot23 ? 6l tsot23 ? 6l udfn8 (2 x 2 mm) sc70 ? 6l sc70 ? 6l bha xxx ym bh = cat4004b device code a = assembly location code xxx = last three digits of assembly lot number y = production year (last digit) m = production month: 1 ? 9, a, b, c vk = cat4002b device code kl = CAT4003B device code y = production year (last digit) m = production month: 1 ? 9, a, b, c vh = cat4002b device code kl = CAT4003B device code a = assembly location code vkym klym vha kla ordering information (note 1) orderable part number package finish shipping (note 2) cat4002btd ? gt3 tsot ? 23, 6 ? lead nipdau (rohs compliant) 3,000 / tape & reel cat4002bsd ? gt3 sc ? 70, 6 ? lead nipdau (rohs compliant) 3,000 / tape & reel CAT4003Btd ? gt3 tsot ? 23, 6 ? lead nipdau (rohs compliant) 3,000 / tape & reel CAT4003Bsd ? gt3 sc ? 70, 6 ? lead nipdau (rohs compliant) 3,000 / tape & reel cat4004bhu2 ? gt3 udfn, 8 ? pad, 2 x 2 mm nipdau (rohs compliant) 3,000 / tape & reel 1. for additional package and temperature options, please contact your nearest on semiconductor sales office. 2. for information on tape and reel specifications, including part orientation and tape sizes, please refer to our tape and reel packaging specifications brochure, brd8011/d.
cat4002b, CAT4003B, cat4004b http://onsemi.com 3 pin connections (top view) cat4004b udfn8 2 x 2 mm vin nc led4 led3 en/dim gnd led1 led2 1 1 1 led2 led3 en/dim gnd vin led1 led3 vin en/dim gnd led2 led1 CAT4003B tsot23 ? 6l CAT4003B sc70 ? 6l 1 1 nc led2 en/dim gnd vin led1 nc vin en/dim gnd led2 led1 cat4002b tsot23 ? 6l cat4002b sc70 ? 6l table 1. pin functions pin name function en/dim device enable (active high) and dimming control gnd ground reference led1 led1 cathode terminal led2 led2 cathode terminal led3 led3 cathode terminal led4 led4 cathode terminal vin device supply input, connect to battery or supply tab connect to gnd on the pcb table 2. absolute maximum ratings parameter value unit vin, ledx voltage 6 v en/dim voltage vin + 0.7 v storage temperature range ? 65 to +160 c junction temperature range ? 40 to +125 c lead temperature 300 c stresses exceeding maximum ratings may damage the device. maximum ratings are stress ratings only. functional operation above t he recommended operating conditions is not implied. extended exposure to stresses above the recommended operating conditions may af fect device reliability. table 3. recommended operating conditions parameter value unit vin 2.4 to 5.5 v ambient temperature range ? 40 to +85 c led current range 0 to 25 ma 3. typical application circuit with external components is shown on page 1.
cat4002b, CAT4003B, cat4004b http://onsemi.com 4 table 4. electrical operating characteristics (over recommended operating conditions unless specified otherwise) (v in = 4.0 v, en = high, t amb = 25 c) parameter conditions symbol min typ max units quiescent current i led = 25 ma/channel i q 0.5 0.7 1.5 ma shutdown current v en = 0 v i qshdn 1 a full scale led current (average) (note 4) i led ? full 24 25 26 ma led channel matching i led i ledavg i ledavg i led ? dev ? 5 1 +5 % dropout voltage i led = 20 ma i led = 1 ma v dout 75 45 mv en/dim pin ? internal pull ? down resistor ? logic high level ? logic low level r en/dim v hi v lo 1.3 100 0.4 k v v thermal shutdown t sd 150 c thermal hysteresis t hys 20 c undervoltage lockout (uvlo) threshold v uvlo 2.0 v 4. for the cat4004b, i ledavg = (i led,ch1 + i led,ch2 + i led,ch3 + i led,ch4 ) / 4 for the CAT4003B, i ledavg = (i led,ch1 + i led,ch2 + i led,ch3 ) / 3 for the cat4002b, i ledavg = (i led,ch1 + i led,ch2 ) / 2 5. the standard lead finish is nipdau. table 5. recommended en/dim timing (for 2.4 v v in 5.5 v, over full ambient temperature range ? 40 c to +85 c.) parameter conditions symbol min typ max units en/dim program low time t lo 0.2 100 s en/dim program high time t hi 0.2 s led current settling time t led 10 s en/dim low time to shutdown t pwrdwn 2 3 5 ms figure 1. cat400xb en/dim dimming timing diagram 100% en/dim led current shutdown shutdown 97% 94% 3% 0% 100% 32 levels t led t lo t hi t pwrdwn led current setting on the cat400xb, the full scale led current is internally set to 25 ma (no external resistor). when the en/dim is first enabled, the cat400xb sets the led channel current to the full scale current. each consecutive rising edg e on the en/dim decreases the led current by one step until it goes to zero, as shown on figure 1.
cat4002b, CAT4003B, cat4004b http://onsemi.com 5 typical characteristics (CAT4003B, v in = 4 v, v f = 3.3 v, i out = 75 ma (3 leds at 25 ma), c in = 1 f, t amb = 25 c unless otherwise specified.) 0.6 0.8 1.0 1.2 1.4 2.5 3.0 3.5 4.0 4.5 5.0 5.5 input voltage [v] quiescent current [ma] ? 1.0 ? 0.8 ? 0.6 ? 0.4 ? 0.2 0.0 0.2 0.4 0.6 0.8 1.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 input voltage [v] led current change [%] ? 10 ? 8 ? 6 ? 4 ? 2 0 2 4 6 8 10 ? 40 0 40 80 120 temperature [ c] led current change [%] 0.4 0.6 0.8 1.0 1.2 1.4 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 input voltage [v] enable high threshold [v] 25 c ? 40 c 80 c figure 2. en high threshold vs. input voltage figure 3. quiescent current vs. input voltage (full load) figure 4. led current change vs. input voltage figure 5. led current change vs. temperature
cat4002b, CAT4003B, cat4004b http://onsemi.com 6 typical characteristics (CAT4003B, v in = 4 v, v f = 3.3 v, i out = 75 ma (3 leds at 25 ma), c in = 1 f, t amb = 25 c unless otherwise specified.) 0 5 10 15 20 25 30 0 50 100 150 200 250 300 led pin voltage [mv] led current [ma] 25ma 0.8ma 50 60 70 80 90 100 3.0 3.5 4.0 4.5 5.0 input voltage [v] efficiency [%] figure 6. dropout characteristics figure 7. efficiency vs. input voltage figure 8. power up waveform figure 9. power down waveform figure 10. line transient waveform figure 11. dimming levels
cat4002b, CAT4003B, cat4004b http://onsemi.com 7 pin functions vin is the supply pin for the charge pump. a small 1 f ceramic bypass capacitor is required between the vin pin and ground near the device. the operating input voltage range is from 2.4 v to 5.5 v. whenever the input supply falls below the under ? voltage threshold (2.0 v), all the led channels are disabled and the device enters shutdown mode. en/dim is the enable and one wire dimming input for all led channels. levels of logic high and logic low are set at 1.3 v and 0.4 v respectively. when en/dim is initially taken high, the cat400xb becomes enabled and all led currents are set to the full scale 25 ma. to place the device into ?zero current? shutdown mode, the en/dim pin must be held low for 3 ms typical led1 to led4 provide the internal regulated current for each of the led cathodes. there pins enter a high impedance zero current state whenver the device is placed in shutdown mode. gnd is the ground reference for the device. the pin must be connected to the ground plane on the pcb. tab (cat4004b only) is the exposed pad underneath the package. for best thermal performance, the tab should be soldered to the pcb and connected to the ground plane. 4 current sink regulators current setting dac undervoltage lockout register serial interface 100 k en/dim gnd led1 led2 led3 led4 reference voltage figure 12. cat4004b functional block diagram v in vin basic operation the cat400xb uses tightly matched current sinks to accurately regulate led current in each channel. there are 32 dif ferent settings for led brightness that can be programmed through the en/dim pin. tight current regulation for all channels is possible over a wide range of input and led voltages due to independent current sensing circuitry on each channel. each led channel needs a minimum of 75 mv headroom to sink a constant regulated current of 20 ma. if the input supply falls below 2.0 v, the under ? voltage lockout circuit disables all led channels and resets the circuit to default values. any unused led channels should be left open. cat400xb led current selection after power ? up and once enabled, the led current is set initially to the full scale currrent of 25 ma. the number of pulses (n) on the en/dim input does decrease the current value as follows: led current [ma] 25 31 n 31 the full scale current is calculated from the above formula with n equal to zero. the en/dim pin has two primary functions. one function enables and disables the device. the other function is led current dimming with 32 dif ferent levels by pulsing the input signal, as shown on figure 13. on each consecutive pulse rising edge, the led current is decreased by about 3.2% (1/31th of the full scale value). after 30 pulses, the led current is 3.2% of the full scale current. on the 31 st pulse, the current drops to zero, and then goes back to full scale on the following pulse. each pulse width should be between 200 ns and 100 s. pulses faster than the minimum tlo may be ignored and filtered by the device. pulses longer than the maximum tlo may shutdown the device. by pulsing the en/dim signal at high frequency, the led current can quickly be set to zero. the led driver enters a ?zero current? shutdown mode if en/dim is held low for 3 ms typical. the dimming level is set by the number of pulses on the en/dim after the power ? up, as shown in table 6.
cat4002b, CAT4003B, cat4004b http://onsemi.com 8 table 6. dimming levels full scale current in % dimming pulses [n] 100 0 97 1 94 2 90 3 87 4 84 5 81 6 77 7 74 8 71 9 68 10 65 11 61 12 58 13 55 14 52 15 full scale current in % dimming pulses [n] 48 16 45 17 42 18 39 19 35 20 32 21 29 22 26 23 23 24 19 25 16 26 13 27 10 28 6 29 3 30 0 31 100 32 figure 13. en/dim digital dimming timing diagram 100% en/dim led current shutdown shutdown 97% 94% 3% 0% 100% 32 levels t led t lo t hi t pwrdwn
cat4002b, CAT4003B, cat4004b http://onsemi.com 9 package dimensions udfn8, 2x2 case 517aw ? 01 issue o e2 d2 l e pin #1 index area pin #1 identification detail a d a1 b e a top view side view detail a bottom view notes: (1) all dimensions are in millimeters. (2) complies with jedec mo-229. symbol min nom max a 0.45 0.50 0.55 a1 0.00 0.02 0.05 b 0.18 0.25 0.30 d 1.90 2.00 2.10 d2 1.50 1.60 1.70 e 2.00 e2 0.80 0.90 1.00 e 1.90 0.50 bsc 2.10 l 0.20 0.30 0.45
cat4002b, CAT4003B, cat4004b http://onsemi.com 10 package dimensions sc ? 70, 6 lead, 1.25x2 case 419ad ? 01 issue o e1 d a l l1 l2 ee b a1 a2 c top view side view end view 1 1 notes: (1) all dimensions are in millimeters. angles in degrees. (2) complies with jedec mo-203. e symbol min nom max a a1 b c d e e1 e l 0o 8o l2 0.00 0.15 0.10 0.26 1.80 1.80 1.15 0.65 bsc 0.15 bsc 1.10 0.10 0.30 0.18 0.46 2.20 2.40 1.35 l1 0.80 1 4o 10o a2 0.80 1.00 0.42 ref 0.36 2.00 2.10 1.25
cat4002b, CAT4003B, cat4004b http://onsemi.com 11 package dimensions tsot ? 23, 6 lead case 419af ? 01 issue o e1 e a2 a1 e b d c a top view side view end view l1 l l2 notes: (1) all dimensions are in millimeters. angles in degrees. (2) complies with jedec mo-193. symbol min nom max a a1 a2 b c d e e1 e l 0o 8o l1 l2 0.01 0.80 0.30 0.12 0.30 0.05 0.87 0.15 2.90 bsc 2.80 bsc 1.60 bsc 0.95 typ 0.40 0.60 ref 0.25 bsc 1.00 0.10 0.90 0.45 0.20 0.50 on semiconductor and are registered trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to mak e changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for an y particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including wi thout limitation special, consequential or incidental damages. ?typical? parameters which may be provided in scillc data sheets and/or specifications can and do vary in different application s and actual performance may vary over time. all operating parameters, including ?typicals? must be validated for each customer application by customer?s technical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the scillc product could create a sit uation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its of ficers, employees, subsidiaries, af filiates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, direct ly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws and is not for resale in any manner. cat4002b/d publication ordering information n. american technical support : 800 ? 282 ? 9855 toll free usa/canada europe, middle east and africa technical support: phone: 421 33 790 2910 japan customer focus center phone: 81 ? 3 ? 5773 ? 3850 literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 303 ? 675 ? 2175 or 800 ? 344 ? 3860 toll free usa/canada fax : 303 ? 675 ? 2176 or 800 ? 344 ? 3867 toll free usa/canada email : orderlit@onsemi.com on semiconductor website : www.onsemi.com order literature : http://www.onsemi.com/orderlit for additional information, please contact your local sales representative

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