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CAT3604V ? catalyst semiconductor, inc. 1 doc. no. md-5029, rev. b characteristics subject to change without notice 4-channel quad-mode? led driver with open/short led detection features ? quad-mode charge pump: 1x, 1.33x, 1.5x, 2x ? drives up to 4 leds at 30ma each ? pin compatible with industry standard ?604 ? open/short led automatic detection ? power efficiency up to 92% ? high resolution pwm dimming ? low noise supply ripple in all modes ? soft start and current limiting ? short circuit and thermal overload protection ? 16-pad tqfn package, 4mm x 4mm application ? lcd display backlight ? cellular phones ? digital still cameras ? handheld devices ordering information part number package qty per reel marking CAT3604Vhv4-gt2 tqfn-16 (1) 4 x 4mm 2000 cdak CAT3604Vhv4-t2 tqfn-16 4 x 4mm 2000 cdaf note: (1) nipdau plated finish, rohs compliant for other finishes, pl ease contact factory description the CAT3604V is a high efficiency quad-mode tm fractional charge pump that can drive up to four leds with input supply voltages as low as 2.5v. an external rset resistor is used to control the led channel brightness while channel diagnostics include automatic detection for both short and open led channel conditions, ensuring the CAT3604V maintains the highest efficiency level in all operating modes. each operating mode uses a constant high frequency switching scheme which allows the use of small form factor external ceramic capacitors while delivering excellent low noise input supply ripple up to 5.5 volts. the en input control supports direct pwm dimming and can accommodate dimming frequencies in excess of 10khz thereby providing extremely high resolution brightness levels. the device is available in the 16-pad low profile 0.8mm thin qfn (4mm x 4mm). pin configuration typical application circuit for ordering information details, see page 14. gnd v in 2 .4v to 5.5v 20ma 4.02k ? on off led1 led2 led3 led4 rset en CAT3604V vin vout v out 1f 1f c1- c1+ c2- c2+ 1f 1f c out c in 16 15 14 13 12 11 10 9 1 2 3 4 5678 en nc nc nc gnd c2+ c2- c1- led1 led2 led3 led4 rset vout vin c1+ gnd
CAT3604V doc. no. md-5029 rev. b 2 ? catalyst semiconductor, inc. characteristics subject to change without notice absolute maximum ratings parameter rating unit vin, ledx, c1, c2 voltage 6 v vout voltage 7 v en voltage 6 v storage temperature range -65 to +160 c junction temperature range -40 to +150 c lead temperature 300 c recommended operating conditions parameter rating unit vin 2.5 to 5.5 v ambient temperature range -40 to +85 c i led per led pin 0 to 25 ma total output current 0 to 100 ma led forward voltage range 1.3 to 4.3 v typical application circuit with external components is shown on page 1. electrical operating characteristics (over recommended operating conditions unless specified otherwise) v in = 3.6v, en = high, t amb = 25 c symbol name conditions min typ max units i q quiescent current 1x mode, no load 1.33 x mode, no load 1.5x mode, no load 2x mode, no load 1.0 1.7 2.2 2.4 ma ma ma ma i qshdn shutdown current v en = 0v 1 a i led-acc led current accuracy i ledavg / i ledavg-nominal 2 % i led-dev led channel matching (i led - i ledavg ) / i ledavg 1.5 % i led programmed led current r set = 34.0k ? r set = 5.23k ? r set = 2.67k ? 2.4 15 30 ma v rset rset regulated voltage 0.58 0.6 0.62 v r out output resistance (open loop) 1x mode 1.33x mode, v in = 3v 1.5x mode, v in = 2.7v 2x mode, v in = 2.4v 0.8 5 5 10 ? ? ? ? f osc charge pump frequency 1.33x and 2x mode 1.5x mode 0.8 1 1 1.3 1.3 1.6 mhz mhz i sc_max output short circuit current limit v out < 0.5v 50 ma i in_max input current limit v out > 1v 250 ma led th 1x to 1.33x, 1.33x to 1.5x or 1.5x to 2x transition thresholds at any led pin 130 mv v hys 1x mode transition hysteresis 400 mv r en v hi v lo en pin ? internal pull-down resistor ? logic high level ? logic low level 1.3 100 0.4 k ? v v t sd thermal shutdown 150 c t hys thermal hysteresis 20 c v uvlo undervoltage lockout (uvlo) threshold 1.6 1.8 2.0 v
CAT3604V ? catalyst semiconductor, inc. 3 doc. no. md-5029 rev. b characteristics subject to change without notice a.c. characteristics for 2.5v vin 5.5v, over full ambient tem perature range -40 to +85c. symbol name conditions min typ max units t led led current settling time from shutdown mode 1x mode, v in = 4v 1.33x mode, v in = 3.5v 40 400 s t md mode transition time 500 s t pwrdwn device power down delay 0.9 1.5 ms t led-on led on settling time 1 s t led-off led off settling time 120 ns figure 1. CAT3604V timing characteristics led current setting the nominal led current is set by the external resistor connected between the rset pin and ground. table 1 lists standard resistor values for several led current settings. led current (ma) rset (k ) 2 40.0 5 15.8 10 7.87 15 5.23 20 4.02 25 3.16 30 2.67 table 1. resistor rset and led current
CAT3604V doc. no. md-5029 rev. b 4 ? catalyst semiconductor, inc. characteristics subject to change without notice typical performance characteristics v in = 3.6v, i out = 80ma (4 leds at 20ma), c in = c out = c 1 = c 2 = 1 f, t amb = 25c unless otherwise specified. efficiency vs. input voltage 40 50 60 70 80 90 100 2.0 2.5 3.0 3.5 4.0 4.5 input voltage [v] efficiency [%] 1x 1.33x 1.5x 2x v f = 3.3v efficiency vs. li-ion voltage 40 50 60 70 80 90 100 3.0 3.2 3.4 3.6 3.8 4.0 4.2 input voltage [v] efficiency [%] v f = 3.3v 1x 1.33x quiescent current vs. input voltage 0.0 1.0 2.0 3.0 4.0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 input voltage [v] quiescent current [ma] leds off v f = 3.3v quiescent current vs. temperature 0.0 1.0 2.0 3.0 4.0 -40 0 40 80 120 temperature [c] quiescent current [ma] 2x 1.5x 1.33x 1x led current change vs. input voltage -10 -8 -6 -4 -2 0 2 4 6 8 10 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 input voltage [v] led current variation [%] . v f = 3.3v led current change vs. temperature -10 -8 -6 -4 -2 0 2 4 6 8 10 -40 0 40 80 120 temperature [c] led current variation [%] . v f = 3.3v
CAT3604V ? catalyst semiconductor, inc. 5 doc. no. md-5029, rev. b characteristics subject to change without notice typical performance characteristics v in = 3.6v, i out = 80ma (4 leds at 20ma), c in = c out = c 1 = c 2 = 1 f, t amb = 25c unless otherwise specified. switching frequency vs. temperature 0.7 0.8 0.9 1.0 1.1 1.2 1.3 -40 0 40 80 120 temperature [c] switching frequency [mhz] 1.5x mode 1.33x, 2x mode output resistance vs. input voltage 0 2 4 6 8 10 12 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 input voltage [v] output resistance [ ? ] . 1x 1.33x 1.5x 2x foldback current limit 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0 100 200 300 400 output current [ma] output voltage [v] 1x mode led current vs. led pin voltage 0 10 20 30 40 0 50 100 150 200 250 300 led pin voltage [mv] led current [ma] led current vs. rset resistance 1 10 100 110100 rset resistance [k ? ] led current [ma] line transient response (3.6v to 4.9v)
CAT3604V doc. no. md-5029, rev. b 6 ? catalyst semiconductor, inc. characteristics subject to change without notice typical performance characteristics v in = 3.6v, i out = 80ma (4 leds at 20ma), c in = c out = c 1 = c 2 = 1 f, t amb = 25c unless otherwise specified. operating waveforms in 1x mode switching waveforms in 1.33x mode switching waveforms in 1.5x mode switching waveforms in 2x mode
CAT3604V ? catalyst semiconductor, inc. 7 doc. no. md-5029 rev. b characteristics subject to change without notice typical performance characteristics v in = 3.6v, i out = 80ma (4 leds at 20ma), c in = c out = c 1 = c 2 = 1 f, t amb = 25c unless otherwise specified. cold power up in 1x mode cold power up in 1.33x mode cold power up in 1.5x mode cold power up in 2x mode cold power up (1x mode) power down (1x mode)
CAT3604V doc. no. md-5029, rev. b 8 ? catalyst semiconductor, inc. characteristics subject to change without notice pin description pin # name function 1 en device enable (active high). 2 nc not connected inside the package. 3 nc not connected inside the package. 4 nc not connected inside the package. 5 rset connect resistor rset to set the led current. 6 vout charge pump output connected to the led anodes. 7 vin charge pump input, con nect to battery or supply. 8 c1+ bucket capacitor 1 positive terminal 9 c1- bucket capacitor 1 negative terminal 10 c2- bucket capacitor 2 negative terminal 11 c2+ bucket capacitor 2 positive terminal 12 gnd ground reference 13 led4 led4 cathode terminal. 14 led3 led3 cathode terminal. 15 led2 led2 cathode terminal. 16 led1 led1 cathode terminal. tab gnd connect to gnd on the pcb. pin function 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 2.5v to 5.5v. whenever the input supply falls below the under-voltage threshold (1.8v), all the led channels are disabled and the device enter s shutdown mode. en is the enable input and the high resolution pwm dimming control. levels of l ogic high and logic low are set at 1.3v and 0.4v respectively. when en is initially taken high, the device becomes enabled and all led currents are set according to the r set resistor. to place the device into ?zero current? shutdown mode, the en pin must be held low for at least 1.5ms. vout is the charge pump output that is connected to the led anodes. a small 1 f ceramic bypass capacitor is required between the v out pin and ground near the device. gnd is the ground reference for the charge pump. the pin must be connected to the ground plane on the pcb. c1+, c1- are connected to each side of the ceramic bucket capacitor c 1 . c2+, c2- are connected to each side of the ceramic bucket capacitor c 2 . led1 to led4 provide the internal regulated current source for each of the led cathodes. these pins enter high-impedance zero cu rrent state whenever the device is placed in shutdown mode. if an led pin is directly tied to vout, that channel is disabled. tab 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. rset is connected to the resistor (r set ) to set the current for the leds. the voltage at this pin regulated to 0.6v. the ground side of the external resistor should be star connected back to the gnd of the pcb. in shutdown mode, rset beomes high impedance.
CAT3604V ? catalyst semiconductor, inc. 9 doc. no. md-5029 rev. b characteristics subject to change without notice set r v 6 . 0 132 block diagram figure 2. CAT3604V functional block diagram basic operation at power-up, the CAT3604V starts operating in 1x mode where the output will be approximately equal to the input supply voltage (less any internal voltage losses). if the output voltage is sufficient to regulate all led currents, the device remains in 1x operating mode. if the input voltage is insufficient or falls to a level where the regulated currents cannot be maintained, the device automatically switches into 1.33x mode (after a fixed delay time of about 400 s). in 1.33x mode, the output voltage is approximately equal to 1.33 times the input supply voltage (less any internal voltage losses). this sequence repeats in the 1.33x and 1.5x mode until the driver enters the 2x mode. in 1.5x mode, the output voltage is approximately equal to 1.5 times the input supply voltage. while in 2x mode, the output is approximately equal to 2 times the input supply voltage. if the device detects a sufficient input voltage is present to drive all led currents in 1x mode, it will change automatically back to 1x mode. this only applies for changing back to the 1x mode. the difference between the input voltage when exiting 1x mode and returning to 1x mode is called the 1x mode transition hysteresis (v hys ) and is about 500mv led current selection the led current is set to by the external resistor rset as follows: led current = the en pin enables and disables the device. the led driver enters a ?zero current? shutdown mode if en is held low for 1.5ms or more. as soon as the en input goes low, all led channels are instantly disabled, where the led current is set to zero. as long as the CAT3604V is not in shutdown mode, the leds turn on as soon as the en goes high. mode control 1, 1.3mhz oscillator current setting reference voltage 1x mode (ldo) 1.33x, 1.5x, 2x charge pump v in vin c 1- c 2- c 1+ c 2+ vout en rset gnd led1 led2 led3 led4 led channel current regulators
CAT3604V doc. no. md-5029, rev. b 10 ? catalyst semiconductor, inc. characteristics subject to change without notice unused led channels for applications not requiring all the channels, it is recommended to connect the unused led pins directly to vout (see figure 3). figure 3. application with 3 leds protection mode if an led is disconnected, the device senses that, run the diagnostics, then ignores that channel and goes back to the most effect ive mode. when all leds are disconnected, the device runs diagnostics and goes to 1x mode where the output is basically equal to the input voltage. as soon as the output exceeds about 6v, the driver resets itself and reevaluate the mode. if the die temperature reaches +150c, the device enters a thermal protection shutdown mode. when the device temperature drops to about +130c, the device resumes normal operation. led selection leds with forward voltages (v f ) ranging from 1.3v to 4.3v may be used. selecting leds with lower v f is recommended in order to extend battery life and keep the driver in 1x mode longer as the battery voltage decreases. for example, if a 3.3v v f led is selected instead of a 3.5v v f led, the driver will stay in 1x mode for a lower supply voltage of 0.2v. external components the driver requires four external 1 f ceramic capa- citors for decoupling input, output, and for the charge pump. both capacitors type x5r and x7r are recommended for the led driver application. in all charge pump modes, the input current ripple is kept very low by design and an input bypass capacitor of 1 f is sufficient. in 1x mode, the device operates in linear mode and does not introduce switching noise back onto the supply. recommended layout in charge pump mode, the driver switches internally at a high frequency. it is recommended to minimize trace length to all four capacitors. a ground plane should cover the area under the driver ic as well as the bypass capacitors. short connection to ground on capacitors c in and c out can be implemented with the use of multiple via. a copper area matching the tqfn exposed pad (tab) must be connected to the ground plane underneath. the use of multiple via improves the package heat dissipation. figure 4. pcb layout gnd v in led2 led3 led1 led4 rset en CAT3604V vin vout 1f 1f c in c1- c1+ c2- c2+ 1f 1f c out r set on off
CAT3604V ? catalyst semiconductor, inc. 11 doc. no. md-5029 rev. b characteristics subject to change without notice pwm dimming the en pin is used to provide total shutdown of the device as well as high resolution pwm dimming control on the led channels. shutdown of the device occurs after the en pin has been held low for 1.5ms. during the ?soft-start? power- up sequence from the shutdown mode, the led current typically settles within 40s (for 1x mode operation). this led current settling time becomes 400s if 1.33x operation is needed (i.e low battery voltage). for high resolution pwm dimming control (typically frequencies at 2khz or above), the device will remain powered and only the led channels output will be switched on and off during the pwm (the rest of the device will remain po wered-up). this al lows the output channels to have ?instant-on? response, where the led current settles within 1s of the applied pwm dimming signals. this ?instant-on? modes makes the device suitable for extremely high frequency pwm dimming schemes. figure 5 shows the output current for pwm frequencies up to 100khz and with duty cycles of 30% and 70%. figure 5. output current vs. pwm frequency for best performance, the duty cycle off-time t off should meet the following timing limits: ? for slow frequency 600hz, t off 800s ? for fast frequency 1khz, t off 400s 10 20 30 40 50 60 70 80 90 100 0.1 1 10 100 pwm frequency [khz] output current [%] 70% dc 30% dc
CAT3604V doc. no. md-5029, rev. b 12 ? catalyst semiconductor, inc. characteristics subject to change without notice typical performance characteristics v in = 3.6v, i out = 80ma (4 leds at 20ma), c in = c out = c 1 = c 2 = 1 f, t amb = 25c unless otherwise specified. 10khz pwm waveform (1x mode) 10khz pwm waveform (1.33x mode) 300hz pwm waveform (1x mode) dimming linearity, pwm at 200hz 0 20 40 60 80 100 0 20406080100 duty cycle [%] dimming [%] 1x mode vin = 4v 1.33x mode vin = 3.5v dimming linearity, pwm at 500hz 0 20 40 60 80 100 020406080100 duty cycle [%] dimming [%] 1x mode vin = 4v 1.33x mode vin = 3.5v dimming linearity, pwm at 30khz 0 20 40 60 80 100 0 20406080100 duty cycle [%] dimming [%] 1x mode vin = 4v 1.33x mode vin = 3.5v
CAT3604V ? catalyst semiconductor, inc. 13 doc. no. md-5029 rev. b characteristics subject to change without notice package outline drawing tqfn 16-pad 4 x 4mm (hv4) (1)(2) notes: (1) all dimensions are in millimeters. (2) complies with jedec satndard mo-220. for current tape and reel information, download the pdf file from: http://www.catsemi.com/documents/tapeandreel.pdf. 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 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 ? 2.90 e 3.90 4.00 4.10 e2 2.00 ? 2.90 e 0.65 bsc l 0.30 ? 0.60
CAT3604V doc. no. md-5029, rev. b 14 ? catalyst semiconductor, inc. characteristics subject to change without notice example of ordering information (1) notes: (1) all packages are rohs-compliant (lead-free, halogen-free). (2) the standard lead finish is nipdau. (3) the device used in the above example is a ca t3604vhv4-gt2 (tqfn, tape & reel, 2,000/reel). (4) for additional package and temperature options, please contact your nearest ca talyst semiconductor sales office. suffix device # prefix cat 3604v hv4 ? g t2 tape & reel t: tape & reel 2: 2,000/reel product numbe r optional com p an y id package hv4: tqfn lead finish blank: matte-tin g: nipdau for product top mark codes, click here: http://www.catsemi.com/techsupport/producttopmark.asp
revision history date rev. reason 04-dec-07 a initial release 28-apr-08 b update package outline drawing ? tqfn 16-pad 4 x 4 (hv4) catalyst semiconductor, inc. corporate headquarters 2975 stender way santa clara, ca 95054 phone: 408.542.1000 document no: md-5029 fax: 408.542.1200 revision: b www.catsemi.com issue date: 04/28/08 copyrights, trademarks and patents ? catalyst semiconductor, inc. trademarks and register ed trademarks of catalyst semiconductor include each of the following: adaptive analog?, beyond memory?, dpp?, ezdim?, ldd?, minipot?, quad-mode? and quant um charge programmable? catalyst semiconductor has been issued u. s. and foreign patents and has patent applicat ions pending that protect its products. catalyst semiconductor makes no warranty, representation or guar antee, express or implied, regarding the suitability of its products for any particular purpose, nor that the use of its pro ducts will not infringe its intellectual property rights or the rights of third parties with respect to any particular use or application and specifically disclaims any and all liability aris ing out of any such use or application, including but not limited to, consequential or incidental damages. catalyst semiconductor products are not designed, intended, or authorized for use as components in systems intended for surgica l implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the catalyst semiconduct or product could create a situation where personal injury or death may occur. catalyst semiconductor reserves the right to make changes to or discontinue any produ ct or service descr ibed herein without not ice. products with data sheets labeled "advance information" or "preliminary" and other products described herein may not be in pr oduction or offered for sale. catalyst semiconductor advises customers to obtain the current version of the rele vant product informati on before placing order s. circuit diagrams illustrate typical semiconductor applications and may not be complete.

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