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? semiconductor components industries, llc, 2010 january, 2010 ? rev. 3 1 publication order number: CAT3606/d CAT3606 6-channel low noise charge pump white led driver description the CAT3606 controls up to four leds for the main display and two leds for the sub-display in cellular phones. the device is capable of operating in either 1x (ldo) mode or 1.5x charge pump mode. all led pin currents are regulated and tightly matched to achieve uniformity of brightness across the lcd backlight. an external resistor (r set ) sets the nominal output current. the device can deliver as much as 20 ma per channel during low voltage operation (3 v), and 30 ma per channel during nominal operation (3.3 v). a constant high-frequency switching scheme (1 mhz) provides low noise and allows the use of very small value ceramic capacitors. a ?zero? quiescent current mode can be achieved via the chip enable pin en. the main and sub leds each have their own dedicated on/off control pins enm , ens . dimming can be achieved using either a dc voltage to control the r set pin current, or by applying a pwm signal on the enm and ens pins. the device is available in a 16 ? pad tqfn package with a max height of 0.8 mm. features ? drives up to 4 main leds and 2 sub leds ? separate control for main and sub leds ? compatible with supply voltage of 3 v to 5.5 v ? power efficiency up to 90% ? output current up to 30 ma per led ? high ? frequency operation at 1 mhz ? 2 modes of operation 1x and 1.5x ? white led detect circuitry on all channels ? shutdown current less than 1 a ? small ceramic capacitors ? soft start and current limiting ? short circuit protection ? 16 ? pad tqfn package, 0.8 mm max height ? these devices are pb ? free, halogen free/bfr free and are rohs compliant applications ? cell phone main and sub ? display backlight ? navigation ? pdas ? digital cameras http://onsemi.com tqfn ? 16 hv4 suffix case 510ae pin connections (note 1) g366 marking diagrams device package shipping ordering information CAT3606hv4 ? t2 tqfn ? 16 (note 2) 2,000/ tape & reel g366 = CAT3606hv4 ? t2 cdbb = CAT3606hv4 ? gt2 1. the ?exposed pad? under the package must be connected to the ground plane on the pcb. 2. matte ? tin plated finish (rohs ? compliant). 3. nipdau plated finish (rohs ? compliant). led5 led4 led3 led2 led1 c2+ c2 ? c1 ? led6 en enm ens rset vout vin c1+ 1 (4 x 4 mm) (top view) cdbb CAT3606hv4 ? gt2 tqfn ? 16 (note 3) gnd
CAT3606 http://onsemi.com 2 figure 1. typical application circuit CAT3606 + ? c1+ c2+ c1 ? rset 24 k 1 f 1 f c2 ? vin en rset vout led1 led2 led3 led4 led5 led6 20 ma li ? ion battery on/off enable led1 ? 4 enable led5 ? 6 gnd main display sub display 1 f c out 1 f c in enm ens table 1. pin description pin # name function 1 led6 led6 cathode terminal 2 en enable/shutdown input, active high 3 enm enable ?main? input for led1 to led4, active low 4 ens enable ?sub? input for led5 and led6, active low 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 led1 led 1 cathode terminal 13 led2 led 2 cathode terminal 14 led3 led 3 cathode terminal 15 led4 led 4 cathode terminal 16 led5 led 5 cathode terminal pad gnd ground reference
CAT3606 http://onsemi.com 3 table 2. absolute maximum ratings parameter rating unit vin, vout, ledx voltage ? 0.3 to 7.0 v en, enm , ens 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 i out total output current 0 to 150 ma 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 unit i q quiescent current v en = 0 v 1x mode, no load 1.5x mode, no load 0.1 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 led current range with 6 leds 3.3 vin 4.5 v 3.0 vin 4.5 v 30 20 ma i led led current range with 4 leds 3.3 vin 4.5 v 30 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, enm , ens 1 a v en ? ctr high detect threshold low detect threshold on inputs en, enm , ens 0.4 0.8 0.7 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
CAT3606 http://onsemi.com 4 block diagram figure 2. CAT3606 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 led1 led2 led3 led4 led5 led6 led output select 6 current sink regulators vout 20 ma c1 ? c1+ c2 ? c2+ 1 f 1 f 1 f gnd sub main v in c in c out r set 24 k enm ens
CAT3606 http://onsemi.com 5 basic operation at power-up, the CAT3606 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, to boost the output voltage high enough to achieve the nominal led current. the above sequence 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 main and sub display enable pins (enm or ens ) does not affect 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. 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 the enable lines enm and ens allow to turn on or off a group of leds as shown in table 6. table 6. led selection control lines led outputs en enm ens main led1 ? led4 sub led5 ? led6 0 x x ? ? 1 1 1 ? ? 1 0 1 on ? 1 1 0 ? on 1 0 0 on on notes: 1 = logic high (or vin) 0 = logic low (or gnd) ? = led output off x = don?t care 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 0.2 ma. 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 t3606 is designed to drive leds with forward voltage greater than 1 v and is not compatible with resistive loads.
CAT3606 http://onsemi.com 6 typical characteristics (v in = 3.6 v, en = v in , enm = ens = gnd, c in = c out = 1 f, r set = 24 k (20 ma per led), t amb = 25 c, unless otherwise specified.) figure 3. efficiency vs. input voltage (6 leds) figure 4. efficiency vs. total led current (6 leds) input voltage (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 change vs. temperature input voltage (v) temperature ( c) 4.2 4.0 3.8 3.6 3.4 3.2 3.0 ? 1.5 ? 1.0 ? 0.5 0.5 1.5 125 25 0 ? 25 ? 50 ? 4 ? 2 0 2 4 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 change (%) led current change (%) 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) 6 leds at 15 ma vin = 4 v 6 leds off 6 leds at 15 ma 0 1.0 50 75 100 6 leds off r set = 500 k ? 20 20 60 ? 3 ? 1 1 3
CAT3606 http://onsemi.com 7 typical characteristics (v in = 3.6 v, en = v in , enm = ens = gnd, c in = c out = 1 f, r set = 24 k (20 ma per led), 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 80 120 140 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) ground current (ma) clock frequency (mhz) clock frequency (mhz) output resistance ( ) output resistance ( ) 2 vin = 3.6 v all leds open 100 6 leds at 15 ma 3.4 3.8 1.5x mode 1x mode 6 leds at 20 ma 60 20 ? 20 vin = 3.6 v 6 leds at 15 ma 100 ma load 100 ma load
CAT3606 http://onsemi.com 8 typical characteristics (v in = 3.6 v, en = v in , enm = ens = gnd, c in = c out = 1 f, r set = 24 k (20 ma per led), t amb = 25 c, unless otherwise specified.) figure 15. switching waveforms in 1.5x mode figure 16. operating waveforms in 1x mode 400 nsec/div 400 nsec/div current input 50mv/ vin 50mv/div vout input 50mv/div vin figure 17. power up 6 leds at 15 ma, vin = 3 v (1.5x mode) figure 18. power up 6 leds at 15 ma, vin = 3.6 v (1x mode) 400 sec/div 400 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 10,000 100 10 0.1 10 100 2v/div vout 5ma/div input 1v/div 3.6v to 4.9v vin led current (ma) 10ma/ input current 100ma/ div ac coupled current 10ma/div ac coupled ac coupled vout 50mv/ div div div current current 1000 1
CAT3606 http://onsemi.com 9 typical characteristics (v in = 3.6 v, en = v in , enm = ens = gnd, c in = c out = 1 f, t amb = 25 c, 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 figure 22. rset pin voltage vs. temperature ? 50 ? 25 0 25 50 75 100 125 1.16 1.18 1.20 1.22 1.24 rset pin voltage (v) figure 23. pwm dimming at 1 khz on enm and ens 50ma/div current tot. led 1v/div vout enm & ens 5v/div 200 sec/div temperature ( c) 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 24. a square copper area matches the qfn16 exposed pad (gnd) and must be connected to the ground plane underneath. the use of multiple via will improve the heat dissipation. figure 24. pcb layout
CAT3606 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
CAT3606 http://onsemi.com 11 example of ordering information (note 7) prefix device # suffix company id cat 3606 product number 3606 t2 t: tape & reel 2: 2,000 / reel tape & reel (note 9) (optional) hv4 package hv4: tqfn 4 x 4 mm ? g g: nipdau blank: matte ? tin (note 8) lead finish 5. all packages are rohs ? compliant (lead ? free, halogen ? free). 6. the standard lead finish is nipdau. 7. the device used in the above example is a CAT3606hv4 ? gt2 (tqfn, nipdau plated finish, tape & reel, 2,000/reel). 8. for matte ? tin package option, please contact your nearest on semiconductor sales office. 9. 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. 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. CAT3606/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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