View SP7611AEC6-L_6849080.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

jul31-07 revt sp7611a/7612a/7614a low dropout linear led dri ver ? 2007 sipex corporation page 1 features led drivers for parallel connected leds no emi, no switching noise integrated current matching pwm and analog brightness control enable/shutdown control shutdown current < 0.01a tiny, rohs compliant lead-free packages: sc-70, 2x2 tdfn part # channels maximum steady state current per led sp7611a 4 40ma sp7612a 3 40ma sp7614a 2 80ma description the sp761x driver family provides a simple solution for a matched current source for any color led. the current in the leds can be programmed by an ext ernal resistor. the sp7611a is capable of driving four leds, while the sp7612a can drive thre e leds. the sp7614a is designed to drive two high current leds. led1 should always be connected to an led and never left open in order to have the other leds driven with a matched current to led 1. the sp7612a and sp7614a feature enable pins for flexible on/off control and pwm dimming. sp7612a/4a has extremely low (0.01ua typical) shutdown current, prolonging the battery life and g iving the longest standby period possible in today' s modern design. sp761x driver family is available i n a small footprint 6-pin sc-70 package as well as the 6-pin 2x2 tdfn. typical application schematic solved by tm 2-4 channel low dropout linear led driver sp7611a /c , sp7612a /c , s p7614a /c pin outs for sp7611a and sp7612a on page 3 applications ultra low cost handsets pda, dsc, mp3 players handheld computers lcd display modules keyboard backlight lcd backlight v in led1 led2 gnd ctrl enable v control r set ? ? sp7614a i set sp7614a 6 pin sc70 1 ctrl 3 n/c 4 gnd 2 vled1 6 on/off 5 vled2
jul31-07 revt sp7611a/7612a/7614a low dropout linear led dri ver ? 2007 sipex corporation page 2 absolute maximum ratings these are stress ratings only and functional operat ion of the device at these ratings or any other abo ve those indicated in the operation sections of the specifications below is n ot implied. exposure to absolute maximum rating co nditions for extended periods of time may affect reliability. electrical specifications specifications are at t a =25c, v in = 3.3 to 5.5, enable =v in , ? denotes the specifications which apply over the full operating temperature range, unless o therwise specified. parameter part # min typ max units ? conditions led cathode voltage (v led ) 5.5 v see graph for led current vs. cathode voltage ambient temperature -40 20 85 oc sp7611a sp7612a i set = 100a v led = 300mv output current multiplication ratio in saturation (note1) sp7614a 140 200 260 i set = 100a v led = 150mv sp7611a sp7612a 365 435 505 output current multiplication ratio (gain) (note1) sp7614a 730 870 1010 i set = 25a v led = 0.5v led to led current matching -3 0.8 3 % a ? i set = 100a v led = 300mv current in off mode 0.01 1 a a ? v enable = 0.0v min. enable "on voltage" (note 2) sp7612a sp7614a 3 v a ? i set = 150a max. enable "off voltage" (note 2) sp7612a sp7614a 0.5 v a ? note 1: output current multiplication ratio ( i led / i set ) is not linear. for actual ratio and i led please refer to typical performance characteristics on pages 4 through 7. note 2: enable "on" is v on/off where i led1 > 20ma @ v led1 = 0.3v. enable "off" is v where i < 1 a @ v > 0.3v. note 3. sp7611c/sp7612c/sp7614c are pinout options from sp7611a/sp7612a/sp7614a. all parametric specif ications are identical. v led1 , v led2 , v led3, v led4 and enable voltage to gnd......................... ................................................... ... -0.3v to 6v ctrl voltage to gnd . ............................ ................................................... ................................................... ... .-0.5v output current (i out ) (sp7611a and 7612a).............................. ................................................... ...................... 40ma output current (i out ) (sp7614a)?...................................... ................................................... ............................ 80ma power dissipation per package - 6-pin sc-70 at t a =85c.............................................. ................................ 190mw junction temperature .............................. ................................................... ................................................... .. +150c storage temperature................................ ................................................... ....................................... -55c to + 150c esd level. ................................................... ................................................... ................................................... .............................................. 4kv hbm esd level. ................................................... ................................................... ................................................... .............................................. 1kv cdm
jul31-07 revt sp7611a/7612a/7614a low dropout linear led dri ver ? 2007 sipex corporation page 3 pin description sc70 package pin # pin name description sp7611a sp7612a sp7614a 1 c t r l c t r l c t r l s e t s l e d c u r r e n t 2 l e d 2 l e d 2 l e d 1 c o n n e c t t o c a t h o d e o f l e d 3 l e d 1 l e d 1 n c c o n n e c t t o c a t h o d e o f l e d 4 gnd gnd gnd g r o u n d 5 l e d 4 l e d 3 l e d 2 c o n n e c t t o c a t h o d e o f l e d 6 l e d 3 c o n n e c t t o c a t h o d e o f l e d 6 enable enable c h i p on/ off/ d i s a b l e sc70 package pin # pin name description sp7611c sp7612c sp7614c 1 c t r l c t r l c t r l s e t s l e d c u r r e n t 2 g n d g n d g n d g r o u n d 3 l e d 1 l e d 1 l e d 1 c o n n e c t t o c a t h o d e o f l e d 4 l e d 4 l e d 3 c o n n e c t t o c a t h o d e o f l e d 4 n/c n o c o n n e c t c a n b e l e f t o p e n 5 l e d 3 l e d 2 c o n n e c t t o c a t h o d e o f l e d 5 enable c h i p on/ off/ d i s a b l e 6 l e d 2 l e d 2 c o n n e c t t o c a t h o d e o f l e d 6 enable c h i p on/ off/ d i s a b l e 2x2 tdfn package pin # pin name description sp7611a sp7612a sp7614a 1 l e d 2 l e d 2 n c c o n n e c t t o c a t h o d e o f l e d 2 c t r l c t r l c t r l s e t s l e d c u r r e n t 3 l e d 3 c o n n e c t t o c a t h o d e o f l e d 3 enable enable c h i p on/ off/ d i s a b l e 4 led 4 led 3 led 2 c o n n e c t t o c a t h o d e o f l e d 5 gnd gnd gnd g r o u n d 6 led 1 led 1 led 1 c o n n e c t t o c a t h o d e o f l e d
jul31-07 revt sp7611a/7612a/7614a low dropout linear led dri ver ? 2007 sipex corporation page 4 pinouts 1 2 3 4 5 6 2 x 2 6 pin tdfn led2 ctrl led3 led1 gnd led4 sp7611a 1 2 3 4 5 6 2 x 2 6 pin tdfn nc ctrl enable led1 gnd led2 sp7614a 1 2 3 4 5 6 2 x 2 6 pin tdfn led2 ctrl enable led1 gnd led3 sp7612a sp7611a 6pinsc70 3 2 1 4 5 6 led1 led2 ctrl gnd led4 led3 sp7612a 6pinsc70 3 2 1 4 5 6 led1 led2 ctrl gnd enable led3 sp7614a 6pinsc70 3 2 1 4 5 6 led1 led2 ctrl gnd enable n/c sp7611c 6pinsc70 3 2 1 4 5 6 led1 led2 ctrl gnd led4 led3 sp7612c 6pinsc70 3 2 1 4 5 6 led1 led2 ctrl gnd enable led3 sp7614c 6pinsc70 3 2 1 4 5 6 led1 led2 ctrl gnd enable n/c
jul31-07 revt sp7611a/7612a/7614a low dropout linear led dri ver ? 2007 sipex corporation page 5 sp7611a/12a typical performance characteristics
jul31-07 revt sp7611a/7612a/7614a low dropout linear led dri ver ? 2007 sipex corporation page 6 sp7611a/12a typical performance characteristics
jul31-07 revt sp7611a/7612a/7614a low dropout linear led dri ver ? 2007 sipex corporation page 7 sp7614a typical performance characteristics
jul31-07 revt sp7611a/7612a/7614a low dropout linear led dri ver ? 2007 sipex corporation page 8 sp7614a typical performance characteristics set resistor in k vcontrol =3v sp7614a i led vs. set resistor and cathode voltage
jul31-07 revt sp7611a/7612a/7614a low dropout linear led dri ver ? 2007 sipex corporation page 9 application information setting the led current the led current is controlled by i control and r set according to the following formula: i led = gain x (v control - v ctrl ) / r set gain depends on mode of operation v control is the voltage going into r set v ctrl is the voltage at the pin of the device the voltage v ctrl can be determined using the i set vs control voltage graph located in the typical performance characteristics section. as an example, to set the led current for an sp761x the procedure is: take the led current and divide it by the gain to get i set = i led / gain. look up the v ctrl pin voltage using i set on the graph ?ctrl current vs. control voltage?. once v ctrl is known, use the following formula to find r set . the gain is not linear, the led current vs. cathode voltage graph needs to be used to determine gain. typically, the gain is ~870 for sp7614a and ~435 for sp7611a/12a when the part is operating in the linear region. r set = (v control - v ctrl ) / i set r set example for an sp7614a with v control of 3v and led current of 20ma. i set = 20ma/870 (870 is the typical gain in linear operation) = 22ua. using the graph on page 5 in the typical performance section, the v ctrl voltage on the control pin will be about 1.1v, then r set will be determined by: r set = (3v - 1.1v) / 22ua r set = 86k pwm function the led's brightness can also be adjusted by driving either the enable or the ctrl pin with a pwm signal. the driving signal frequency should be greater than 100hz to avoid flickering, increasing to more than 1mhz, if necessary. temperature considerations leds are very sensitive to temperature. in most cases the maximum allowed junction temperature is 100oc. the case of overtemperature due to power dissipation is de-scribed by the following: t j = t a + ja x i x v f where t j is the led junction temperature, t a is the ambient temperature, ja is the junction to ambient thermal resistance, i is the led current and v f is the led forward voltage. when the temperature rises and the cathode voltage increases, sp761x reduces the current through leds. refer to "led current vs. led cathode voltage" graph under the typical performance characteristics section. efficiency the system efficiency, defined as the ratio between the led's power and the input supplied power can be calculated as follows: efficiency = (v in - v cathode ) / v in the lower the v cathode , the higher the system efficiency. efficiency can be further improved using a higher v in with more leds as shown in example 3. the sp761x driver's low dropout architecture can significantly improve the efficiency compared to using simple ballast resistors. application information the ultra-low voltage drop across the sp761x series of led drivers allows the devices to drive white, blue, and other color leds in a wide range of input voltages. the driver can be used in many
jul31-07 revt sp7611a/7612a/7614a low dropout linear led dri ver ? 2007 sipex corporation page 10 applications. any of the sp761x series of led drivers can be used in the applications presented in this document, due to their similar operation. example 1: drive low v f white or blue leds directly from single cell li- i on when using white or blue low v f leds, and utilizing the driver's low voltage drop, only 3.4v v in is needed for the full 20ma led current. at 3.1v, there is still 5ma of typical current available for the leds. the single cell li- i on battery is utilized in many applications like cell phones or digital still cameras. in most cases, the li- i on battery voltage level only goes down to 3.0v, and not down to the full discharge level (2.7v) before requesting the charger. v drop < 0.3v. this is the dropout voltage for the sp7611a. - v f = 3.1v. low v f white led forward voltage drop - v in (at 20ma) needs to be greater than (v drop +v f ) 3.1v+.3v= 3.4v key advantages 1) no boost circuit needed for the lcd or keyboard backlight. 2) drivers directly connected to a li- i on battery. 3) no emi, no switching noise, no boost converter efficiency loss, 1 capacitor, and no inductor. example 2: drive high v f white or blue leds from existing bus ~ 4.0v to 5.5v high v f leds have a forward voltage drop in the range of 3.2v to 4.0v. in order to drive these leds with the maximum current of 20ma, enabling maximum brightness usually requires a boost circuit for a single cell li- i on power supply. the sp761x series is capable of driving high v f white or blue leds with its ultra-low dropout feature. the v in needs to be only 300mv higher than the highest v f in the circuit. - v drop < 0.3v. dropout voltage of the sp7611a - v f (at 20ma) < 3.3v to 4.0v (high vf) - v in (at 20ma) = v drop + v f = 3.6v to 4.3v - v in (at 5ma typical) ~ 3.3v where v in = existing bus = 3.3v to 4.3v key advantages 1) no boost circuit needed for the lcd or keyboard backlight. 2) drivers utilize existing bus. 3) ultra-low voltage drop provides the full 20ma led current at the lowest possible voltage level. example 3: drive white, blue, red, amber led string in a boost circuit, or existing voltage bus, the sp761x series of led drivers can be used to drive a whole string of leds and achieve flexible brightness control - whether using analog or pwm. v drop = 0.3v. dropout voltage of the sp7611a - v in_min = n x v f + v drop - v in_min = n x vf + 0.3v where v in_min = existing bus, boost voltage ?n? number of leds per branch vf = forward voltage of the led key advantages 1) no need for current matching resistors and discrete transistors for brightness control. application information
jul31-07 revt sp7611a/7612a/7614a low dropout linear led dri ver ? 2007 sipex corporation page 11 led brightness control the sp761x led drivers feature analog and pwm controls to give designers flexible brightness control. to determine the value of r set , use the " i set vs. v crtl " graph under the typical performance characteristics. 1. sp761x/a - analog using v control set v control and r set for led current setting the led current ? page 8 - pwm - vcontrol -amplitude of pwm signal sets maximum led current -pulse width controls current between 0 and maximum led set current - pwm using enable - set v control and r set for led current setting the led current ? page 6 enable = pwm -amplitude has no effect on current -pulse width controls current between 0 and maximum led set current application information
jul31-07 revt sp7611a/7612a/7614a low dropout linear led dri ver ? 2007 sipex corporation page 12 block diagrams
jul31-07 revt sp7611a/7612a/7614a low dropout linear led dri ver ? 2007 sipex corporation page 13 package: 6 pin sc-70
jul31-07 revt sp7611a/7612a/7614a low dropout linear led dri ver ? 2007 sipex corporation page 14 package: 6 pin 2x2tdfn
jul31-07 revt sp7611a/7612a/7614a low dropout linear led dri ver ? 2007 sipex corporation page 15 ordering information for further assistance: email: sipexsupport@sipex.com www support page: http://www.sipex.com/content.aspx?p=support sipex application notes: http://www.sipex.com/applicationnotes.aspx sipex corporation headquarters and sales office 233 south hillview drive milpitas, ca95035 tel: (408) 934-7500 fax: (408) 935-7600 sipex corporation reserves the right to make change s to any products described herein. sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. part number temperature range package rohs pack type pack quantity status SP7611AEC6-L -40c to +85c 6 pin sc70 yes c anister any active sp7611aec6- l/tr -40c to +85c 6 pin sc70 yes tape & reel 3000 acti ve sp7611aer6-l -40c to +85c 6 pin 2x2 tdfn yes ca nister any active sp7611aer6- l/tr -40c to +85c 6 pin 2x2 tdfn yes tape & reel 3000 active sp7612aec6-l -40c to +85c 6 pin sc70 yes c anister any active sp7612aec6- l/tr -40c to +85c 6 pin sc70 yes tape & reel 3000 acti ve sp7612aer6-l -40c to +85c 6 pin 2x2 tdfn yes ca nister any active sp7612aer6- l/tr -40c to +85c 6 pin 2x2 tdfn yes tape & reel 3000 active sp7614aec6-l -40c to +85c 6 pin sc70 yes c anister any active sp7614aec6- l/tr -40c to +85c 6 pin sc70 yes tape & reel 3000 acti ve sp7614aer6-l -40c to +85c 6 pin 2x2 tdfn yes ca nister any active sp7614aer6- l/tr -40c to +85c 6 pin 2x2 tdfn yes tape & reel 3000 active sp7611cec6-l -40c to +85c 6 pin sc70 yes canister any active sp7611cec6-l/tr -40c to +85c 6 pin sc70 yes tape & reel 3000 active sp7612cec6-l -40c to +85c 6 pin sc70 yes canister any active sp7612cec6-l/tr -40c to +85c 6 pin sc70 yes tape & reel 3000 active sp7614cec6-l -40c to +85c 6 pin sc70 yes canister any active sp7614cec6-l/tr -40c to +85c 6 pin sc70 yes tape & reel 3000 active sp7611aec6 -40c to +85c 6 pin sc70 no cani ster any eol sp7611aec6/tr -40c to +85c 6 pin sc70 no tap e & reel 3000 eol sp7612aec6 -40c to +85c 6 pin sc70 no cani ster any eol sp7612aec6/tr -40c to +85c 6 pin sc70 no tap e & reel 3000 eol sp7614aec6 -40c to +85c 6 pin sc70 no cani ster any eol sp7614aec6/tr -40c to +85c 6 pin sc70 no tap e & reel 3000 eol solved by tm

▲Up To Search▲

Price & Availability of SP7611AEC6-L

	To Download SP7611AEC6-L Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .