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? semiconductor components industries, llc, 2010 february, 2010 ? rev. 1 1 publication order number: CAT3604/d CAT3604 4-channel regulated charge pump white led driver description the CAT3604 is a charge pump operating in either 1x (ldo) mode or 1.5x fractional mode regulating current through each of the 4 led pins. operation at a fixed high frequency of 1 mhz typical allows the use of very small value ceramic capacitors. the CAT3604 drives white light-emitting diodes (leds) connected in parallel and provides tightly matched regulated current to achieve uniformity of brightness in lcd backlighting applications. an external resistor r set controls the output current level. led currents of up to 30 ma are supported over a range of input supply voltages from 3 v to 5.5 v, making the device ideal for battery-powered applications. led dimming can be accomplished by several methods including using a dc voltage to set the rset pin current, applying a pwm signal on the control signals, or adding a switched resistor in parallel with rset. the enable input pin allows the device to be placed in power-down mode with ?zero? quiescent current. the CAT3604 features short circuit and overcurrent limiting protection. the device is available in a 16 ? pad tqfn package with a max height of 0.8 mm. features ? drives individually up to 4 leds ? output current up to 30 ma per led ? digital control on/off of each led ? compatible with supply voltage of 3 v to 5.5 v ? power efficiency up to 93% ? 2 modes of operation 1x and 1.5x ? automatic short circuit detect/disable ? high ? frequency operation at 1 mhz ? low value ceramic capacitors ? ?604? compatible pinout ? soft start and current limiting ? tqfn 16 ? pad package, 4 x 4 mm, 0.8 mm max height ? these devices are pb ? free, halogen free/bfr free and are rohs compliant applications ? color lcd and keypad backlighting ? cellular phones ? handheld devices ? digital cameras ? pdas ? portable mp3 players http://onsemi.com tqfn ? 16 hv4 suffix case 510ae pin connections (note 1) g364 marking diagrams device package shipping ordering information CAT3604hv4 ? t2 tqfn ? 16 (note 2) 2,000/ tape & reel g364 = CAT3604hv4 ? t2 cdba = CAT3604hv4 ? gt2 1. the package exposed pad is electrically connec- ted inside the package to gnd and to pin 12. 2. matte ? tin plated finish (rohs ? compliant). 3. nipdau plated finish (rohs ? compliant). led1 led2 led3 led4 gnd c2+ c2 ? c1 ? en ctr0 ctr1 ctr2 rset vout vin c1+ 1 (4 x 4 mm) (top view) cdba CAT3604hv4 ? gt2 tqfn ? 16 (note 3) gnd
CAT3604 http://onsemi.com 2 figure 1. typical application circuit gnd battery 20 ma led2 led3 led1 led4 rset CAT3604 vin vout c1 ? c1+ c2 ? c2+ 1 f en en ctr0 control 0 control 1 control 2 ctr1 ctr2 c out v out 1 f 1 f r set 24 k 1 f c in v in + ? 3 v to 4.2 v table 1. pin description pin # name function 1 en enable input, active high 2 ctr0 digital control input 0 3 ctr1 digital control input 1 4 ctr2 digital control input 2 5 rset the led output current is set by the current sourced out of the rset pin 6 vout charge pump output connected to the led anodes 7 vin supply voltage 8 c1+ bucket capacitor 1 terminal 9 c1 bucket capacitor 1 terminal 10 c2 bucket capacitor 2 terminal 11 c2+ bucket capacitor 2 terminal 12 gnd ground reference 13 led4 led 4 cathode terminal 14 led3 led 3 cathode terminal 15 led2 led 2 cathode terminal 16 led1 led 1 cathode terminal pad gnd pad ground reference
CAT3604 http://onsemi.com 3 table 2. absolute maximum ratings parameter rating unit vin, vout, ledx voltage ? 0.3 to 7.0 v en, ctrx voltage ? 0.3 to vin v rset voltage ? 0.3 to vin v rset current 1 ma ambient temperature range ? 40 to +85 c storage temperature range ? 65 to +160 c lead temperature 300 c esd rating hbm (human body model) 2,000 v esd rating mm (machine model) (note 4) 200 v 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. 4. machine model is with 200 pf capacitor discharged directly into each pin. table 3. recommended operating conditions parameter range unit vin 3.0 to 5.5 v ambient temperature range ? 40 to +85 c input/output/bucket capacitors 1 20% typical f i led per led pin 0 to 30 ma 5. typical application circuit with external components is shown on page 2. table 4. electrical operating characteristics ( limits over recommended operating conditions unless specified otherwise. typical values at t a = 25 c, v in = 3.5 v, i rset = 5 a) symbol parameter conditions min typ max units i q quiescent current v en = 0 v, shutdown mode 1x mode, no load 1.5x mode, no load 0.05 0.3 2.6 1 1 5 a ma ma v rset rset regulated voltage 1.17 1.2 1.23 v i led programmed led current i rset = 5 a i rset = 37 a i rset = 78 a 2.4 15.0 30.0 ma i led ? acc led current accuracy 0.5 ma i led 3 ma 3 ma i led 30 ma 15 5 % i led ? dev led channel matching (i led ? i ledavg ) / i ledavg 3 % r out output resistance (open loop) 1x mode 1.5x mode, i out = 100 ma 1.4 6.5 2.5 10 f osc charge pump frequency 0.8 1.0 1.3 mhz t dropout 1x to 1.5x mode transition dropout delay 0.4 0.6 0.9 ms i en ? ctr input leakage current on inputs en, ctr0, 1 & 2 0.001 1 a v en ? ctr high detect threshold low on inputs en, ctr0, 1 & 2 0.4 0.8 1.3 v i sc input current limit vout = gnd 30 45 60 ma i lim maximum input current vout > 1 v 200 400 600 ma
CAT3604 http://onsemi.com 4 block diagram figure 2. CAT3604 functional block diagram vin battery 3 v to 4.2 v 1 f current setting 1.2 v ref 1 mhz oscillator mode control 1x mode (ldo) 1.5x charge pump en rset gnd ctr0 ctr1 ctr2 led1 led2 led3 led4 led output select 4 current sink regulators 20 ma c1 ? c1+ c2 ? c2+ 1 f 1 f r set 24 k c out v out + ? v in c in 1 f
CAT3604 http://onsemi.com 5 basic operation at power-up, the CAT3604 starts operation in 1x mode. if it is able to drive the programmed led current, it continues in 1x mode. if the battery voltage drops to a level where the led current cannot be met, the driver automatically switches into 1.5x mode. the 1.5x charge pump will boost the output voltage accordingly to achieve the nominal led current. the operating mode is reinitialized each and every time the chip is powered up or is taken out of shutdown mode (via en pin). the use of the control pins (ctr0, ctr1, ctr2) does not reconfigure the mode of operation. led current setting the led current is set by the external resistor r set connected between the rset pin and ground. table 5 lists various led currents and the associated r set resistor value for standard 1% precision surface mount resistors. the digital control lines ctr0, ctr1 and ctr2 allow to turn on or off a combition of leds as shown in table 6. short circuit detect/disables the unused led channels can also be turned off by connecting the respective led pins to vout. in which case, the corresponding led driver is disabled and the typical led sink current is only about 20 a. when the following equation is true on any channel, the driver turns off the led channel: vout v led 1 v (led channel off) note: the ca t3604 is designed to drive leds with forward voltage greater than 1 v and is not compatible with resistive loads. table 5. rset resistor selection led current (ma) r set (k ) 1 649 2 287 5 102 10 49.9 15 32.4 20 23.7 30 15.4 table 6. led selection control lines led outputs ctr2 ctr1 ctr0 led4 led3 led2 led1 0 0 0 ? ? ? on 0 0 1 ? ? on ? 0 1 0 ? on ? ? 0 1 1 on ? ? ? 1 0 0 ? ? on on 1 0 1 ? on on on 1 1 0 on on on on 1 1 1 ? ? ? ? note: 1 = logic high (or vin) 0 = logic low (or gnd) ? = led output off
CAT3604 http://onsemi.com 6 typical characteristics (v in = 3.6 v, en = v in , c in = c out = 1 f, r set = 24 k , t amb = 25 c, unless otherwise specified.) figure 3. efficiency vs. input voltage (4 leds) figure 4. efficiency vs. total led current (4 leds) discharging battery (v) total led current (ma) 3.0 3.2 3.4 3.6 3.8 4.0 4.2 40 50 60 70 80 90 100 200 150 100 50 0 40 50 60 70 80 90 100 figure 5. led current vs. input voltage figure 6. led current vs. temperature input voltage (v) temperature ( c) 4.2 4.0 3.8 3.6 3.4 3.2 3.0 10 12 14 20 24 125 25 0 ? 25 ? 50 14.0 14.5 15.0 15.5 16.0 figure 7. ground current vs. input voltage (1x mode) figure 8. ground current vs. temperature (1x mode) input voltage (v) temperature ( c) 4.2 4.0 3.8 3.6 3.4 3.2 3.0 0 0.1 0.2 0.3 0.4 0.5 100 80 40 0 ? 40 0 0.1 0.2 0.3 0.4 0.5 efficiency (%) efficiency (%) led current (ma) led current (ma) ground current (ma) ground current (ma) 1x mode 1.5x mode 20 ma per led 15 ma per led vin = 4 v (1x mode) vin = 3.2 v (1.5x mode) 4 leds at 15 ma vin = 4 v 4 leds off 1 led at 20 ma 4 leds at 20 ma 4 leds at 15 ma 16 18 22 50 75 100 4 leds off rset = 500 k ? 20 20 60
CAT3604 http://onsemi.com 7 typical characteristics (v in = 3.6 v, en = v in , c in = c out = 1 f, r set = 24 k , t amb = 25 c, unless otherwise specified.) figure 9. ground current vs. input voltage (1.5x mode) figure 10. supply current vs. input voltage input voltage (v) input voltage (v) 4.2 4.0 3.8 3.6 3.4 3.2 3.0 0 1 3 4 5 4.2 4.0 3.6 3.2 3.0 0 40 60 80 100 figure 11. oscillator frequency vs. input voltage figure 12. oscillator frequency vs. temperature input voltage (v) temperature ( c) 4.2 4.0 3.8 3.6 3.4 3.2 3.0 0.90 0.95 1.00 1.05 1.10 100 80 40 0 ? 40 0.90 0.95 1.00 1.05 1.10 figure 13. output resistance vs. input voltage (1x mode) figure 14. output resistance vs. input voltage (1.5x mode) input voltage (v) input voltage (v) 4.2 4.0 3.8 3.6 3.4 3.2 3.0 0 1 2 3 4 4.2 4.0 3.8 3.6 3.4 3.2 3.0 2 4 6 8 10 ground current (ma) supply current (ma) clock frequency (mhz) clock frequency (mhz) output resistance ( ) output resistance ( ) 2 vin = 3.6 v all leds open 20 4 leds at 15 ma 3.4 3.8 1.5x mode 1x mode 4 leds at 20 ma 60 20 ? 20 vin = 3.6 v 4 leds at 15 ma 100 ma load 100 ma load 25 ma load
CAT3604 http://onsemi.com 8 typical characteristics (v in = 3.6 v, en = v in , c in = c out = 1 f, r set = 24 k , t amb = 25 c, unless otherwise specified.) figure 15. switching waveforms in 1.5x mode figure 16. operating waveforms in 1x mode 500 nsec/div 500 nsec/div current input 50mv/ vin 50mv/div vout input 50mv/div vin figure 17. power up 4 leds at 15 ma, vin = 3 v (1.5x mode) figure 18. power up 4 leds at 15 ma, vin = 3.6 v (1x mode) 500 sec/div 500 sec/div 2v/div vout 2v/div en 2v/div vout 100ma/div input 2v/div en figure 19. led current vs. r set figure 20. line transient response in 1x mode rset (k ) 200 sec/div 1000 100 10 1 10 100 2v/div vout 5ma/div led current 1v/div 3.6v to 4.9v vin led current (ma) 10ma/ input current 100ma/ div ac coupled ac coupled ac coupled current 10ma/div ac coupled ac coupled ac coupled ac coupled vout 50mv/ div div div current
CAT3604 http://onsemi.com 9 typical characteristics (v in = 3.6 v, en = v in , c in = c out = 1 f, unless otherwise specified.) figure 21. foldback current limiting output current (ma) 500 400 300 200 100 0 0 1 2 3 4 5 output voltage (v) 1x mode recommended layout when the driver is in the 1.5x charge pump mode, the 1 mhz switching frequency operation requires to minimize trace length and impedance to ground on all 4 capacitors. a ground plane should cover the area on the bottom side of the pcb opposite to the ic and the bypass capacitors. capacitors cin and cout require short connection to ground which can be done with multiple vias as shown on figure 22. a square copper area matches the qfn16 exposed pad (gnd) which is connected by a trace to the pin 12 pad (gnd). a large via (metalized hole) centered in the square pad provides a low impedance connection to the ground plane on the opposite side of the pcb and allows the heat dissipated by the driver ic to spread out resulting in excellent thermal performance. 2.25 mm 2.25 mm 1.95 mm 4.41 mm 0.35 mm 0.76 mm 0.65 mm figure 22. pcb layout figure 23. recommended qfn 16 package land pattern
CAT3604 http://onsemi.com 10 package dimensions tqfn16, 4x4 case 510ae ? 01 issue a e2 a3 e b l a a1 side view top view bottom view e d pin#1 index area pin#1 id detail a detail a front view a1 a d2 notes: (1) all dimensions are in millimeters. (2) complies with jedec mo-220. symbol min nom max a 0.70 0.75 0.80 a1 0.00 0.02 0.05 a3 0.20 ref b 0.25 0.30 0.35 d 3.90 4.00 4.10 d2 2.00 ??? 2.25 e 4.00 e2 2.00 ??? 2.25 e 3.90 0.65 bsc 4.10 l 0.45 ??? 0.65
CAT3604 http://onsemi.com 11 example of ordering information (notes 6, 7) prefix device # suffix company id cat 3604 product number 3604 t2 t: tape & reel 2: 2,000 / reel tape & reel (note 10) (optional) hv4 package hv4: tqfn ? g g: nipdau blank: matte ? tin lead finish 6. the device used in the above example is a CAT3604hv4 ? gt2 (tqfn, nipdau plated finish, tape & reel, 2,000/reel). 7. all packages are rohs ? compliant (lead ? free, halogen ? free). 8. the standard lead finish is nipdau. 9. for additional package and temperature options, please contact your nearest on semiconductor sales office. 10. for information on tape and reel specifications, including part orientation and tape sizes, please refer to our tape and ree l packaging specifications brochure, brd8011/d. 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, affiliates, 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. CAT3604/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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