View SP6683ERTR_1329943.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

1 date: 3/31/06 revg sp6683 1x/1.5x charge pump led driver for flash or backlight ? copyright 2006 sipex corporation sp6683 the sp6683 is a high power current regulated charge pump ideal for converting a li-ion battery input for driving up to 8 white leds used in backlighting color displays. the sp6683 operates with an internal 1.2mhz clock, enabling the use of small external components. output current can be accurately regulated by modulating the switcher between the charge pump and output capacitor. in shutdown mode, the sp6683 discharges the output to ground and draws less than 500na current. offered in 10-pin dfn package, the sp6683 family includes three options that allow the user to optimize led driving circuit; sp6683-lv with low voltage reference, sp6683-03 with high impedance output in shutdown, and sp6683 with pulled down output in shutdown. typical application schematic features output current up to 200ma ideal for white led driver in cellphone flash 0.5 a shutdown current 1x/1.5x mode charge pump +2.7v to +5.5v input voltage range built-in 1.2mhz oscillator 0.5ma quiescent current over temperature protection shorted led protection programmable output current or voltage pwm dimming control via enable pin soft start to limit in-rush current space saving 10-pin 3 x 3mm dfn package three options for optimizing efficiency: sp6683 - mosfet discharge in shutdown sp6683-03 - high impedance in shutdown sp6683-lv - low voltage (150mv)v fb reference applications mobile phone camera flash driver pda digital still camera digital camcorder color lcd module 1x/1.5x high efficiency charge pump led driver for flash or backlight now available in lead free packaging description sp6683 10 pin dfn 10 9 8 7 6 c2p c1n gnd c2n en/pwm 1 2 3 4 5 v out c1p v in v mode fb sp6683 1 vout c1p 2 vin 3 vmode 4 fb 5 10 c2p c1n 9 gnd 8 c2n 7 en/pwm 6 en/pwm c1 2.2uf 6.3v/0603 c2 1uf 6.3v/0603 c4 6.3v/0603 c3 1uf 6.3v/0603 led1 rb 1.5 ohm 1% / 0603 vin 2.7v~4.2v io=vfb/rb 2.2uf
2 date: 3/31/06 revg sp6683 1x/1.5x charge pump led driver for flash or backlight ? copyright 2006 sipex corporation electrical characteristics unless otherwise specified: v in = 3.6v, c1 = c4 = 2.2 f & c2 = c3 = 1 f (ceramic, esr=0.03 ? ) and t amb =25 . the ? denotes specifications which apply over full operating temperature range -40? to +85?. v in , v mode , v out and en/pwm ................. -0.3v to 6v output current (i out ) ...................................... 300ma power dissipation per package - 10-pin dfn (derate 8.84mw/ c above +70 c) ..................... 1.2w junction temperature .................................... +125 c storage temperature ...................... -65 c to +150 c esd rating. ................................................ 2kv hbm these are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. exposure to absolute maximum rating conditions for extended periods of time may affect reliability. absolute maximum ratings parameter min. typ. max. units conditions input voltage 2.7 5.5 v ? quiescent current 0.5 3 ma ? v in = 3.0 - 5.5v, v out = 3.6v, iout = 100a shutdown current 0.5 1.5 a ? v en /pwm = 0.0v, v in = 5.5v maximum load current 200 ma v in = 4.2v, vout = 3.6v oscillator frequency 0.7 1.2 1.5 mhz ? v in = 2.7 - 5.5v v fb reference voltage 0.283 0.315 0.347 v ? i out = 20ma, v out = 3.6v, 1.5x mode output resistance 813 ? ? 1.5x mode, 100ma load 36 ? 1.0x mode, 100ma load v mode threshold voltage 1.00 1.25 1.50 v v in falling v mode hysteresis 60 150 mv v in = 3.6v v mode pin current 0.01 0.5 a ? v mode = 1.25 v en/pwm logic low 0.4 v ? en/pwm logic high 1.6 v ? en/pwm pin current 0.01 0.5 a ? v en /pwm = 4.2v fb pin current 0.01 0.5 a ? v fb = 1v v out ripple 80 mv v out = 4v, i out = 100ma ,1.5x mode v out turn-on time 250 500 s ? fb within 90% regulation 1.5x mode, v out = 3.6, i out = 100a
3 date: 3/31/06 revg sp6683 1x/1.5x charge pump led driver for flash or backlight ? copyright 2006 sipex corporation functional diagram pin description pin number pin name description 1v out regulated charge pump output. 2 c1p positive terminal to the charge pump flying capacitor c2. 3v in input supply voltage. 4v mode charge pump mode program pin. when v mode is greater than 1.25v, a x1 charge pump is used. otherwise, charge pump switches to x1.5 mode. a voltage divider shown in the typical application circuit programs the v in threshold for charge pump mode switching. 5f b this is the feedback pin for output current or voltage regulation. the voltage of this pin is compared with an internal 315mv reference. 6 en/pwm enable and pwm dimming control input. pull this pin low to discon- nect v out from v in and shutdown the sp6683.v out is pulled to ground in shutdown. 7c 2n negative terminal to the charge pump flying capacitor, c4. 8 gnd ground reference. 9c 1n negative terminal to the charge pump flying capacitor, c2. 10 c2p positive terminal to the charge pump flying capacitor c4. v out 315mv en/pwm 1.25v c2n start-up and charge pump switches v mode c2p c1p fb mode control gnd v in c1n 1.2 mhz clock manager v oltage reference mode comp v out comp
4 date: 3/31/06 revg sp6683 1x/1.5x charge pump led driver for flash or backlight ? copyright 2006 sipex corporation typical performance characteristics (25 o c) iout vs. vin @ 200ma 0 50 100 150 200 250 300 3.0 3.5 4.0 4.5 5.0 vin (v) iout (ma) vf = 3.0v vf = 3.3v vf = 3.6v vf = 3.9v iout vs. vin @ 300ma 0 50 100 150 200 250 300 350 400 3.0 3.5 4. 04.55.0 vin (v) iout (ma) vf = 3.0v vf = 3.3v vf = 3.6v iout vs. vin @ 60ma 0 50 100 150 200 3.0 3.5 4. 04.55.0 vin (v) iout (ma) vf = 3.0v vf = 3.3v vf = 3.6v vf = 3.9v vf = 4.2v iout vs. vin @ 100ma 0 50 100 150 200 3.0 3.5 4.0 4.5 5.0 vin (v) iout (ma) vf = 3.0v vf = 3.3v vf = 3.6v vf = 3.9v vf = 4.2v
5 date: 3/31/06 revg sp6683 1x/1.5x charge pump led driver for flash or backlight ? copyright 2006 sipex corporation typical performance characteristics (25 o c) e fficiency vs vin (iout = 60ma) 0 10 20 30 40 50 60 70 80 90 100 3.0 3.5 4. 04.55.0 vin (v) e fficien cy (%) vf = 3.0v vf = 3.3v vf = 3.6v vf = 3.9v vf = 4.2v e fficiency vs vin (iout = 100ma) 0 10 20 30 40 50 60 70 80 90 100 3.0 3.5 4.0 4.5 5.0 vin (v) efficiency (% ) vf = 3.0v vf = 3.3v vf = 3.6v vf = 3.9v vf = 4.2v e fficiency vs vin (iout = 200ma) 0 10 20 30 40 50 60 70 80 90 100 3.0 3.5 4.0 4.5 5.0 vin (v) effici ency (% ) vf = 3.0v vf = 3.3v vf = 3.6v vf = 3.9v e fficiency vs vin (iout = 300ma) 0 10 20 30 40 50 60 70 80 90 100 3.0 3.5 4.0 4.5 5.0 vin (v) effici ency (% ) vf = 3.0v vf = 3.3v vf = 3.6v
6 date: 3/31/06 revg sp6683 1x/1.5x charge pump led driver for flash or backlight ? copyright 2006 sipex corporation 1) voltage reference. this block provides the 315mv and 1.25v reference voltages needed for the two comparators. 2) mode control. an external voltage divider connected to the v mode pin will define an input voltage to the mode comparator which sets the logic state of the mode selection outputs to the x1 or x1.5 modes. v mode is compared to a 1.25v bandgap voltage. for example, if one makes a 158k/100k divider, the mode will change at 2.58 x 1.25 v = 3.23v. a comparator- based cycle by cycle regulation ensures that no mode change occurs during cycles. 3) clock manager. an internal 1.2mhz clock is generated in this block. depending on the mode control, the appropriate clock phasing is generated here and sent to the startup and charge pump switches block. 4) v out comparator & output control. a 315mv reference voltage is compared to feed- back voltage to control the v out needed for the application. output current is set by a bias resistor from the fb pin to the gnd pin chosen by the relationship: i out = v fb r fb where v fb = 315mv. general overview the sp6683 is a current regulated charge pump ideal for converting a li-ion battery input for driving white leds used in camera flash or backlighting color displays in cellular phones, pdas, digital cameras and mp3 players. the sp6683 is able to efficiently drive one 200ma flash led or up to eight 20ma white leds in parallel and maintain a constant brightness over a very wide operating voltage range (2.7v to 5.5v). the sp6683 operates with an internal 1.2mhz clock, enabling the use of small exter- nal components. other features of sp6683 in- clude pwm dimming control as well as com- plete input/output disconnect in shutdown. in shutdown mode the ic typically draws 500na current. the output regulation is achieved by sensing the voltage at the feedback pin and modulating the switch between the charge pump and output capacitor. theory of operation the sp6683 regulated charge pump block dia- gram consists of four main blocks (voltage reference, mode control, clock manager, start- up and charge-pump switches) and two com- parators (v mode comparator and v out com- parator). theory of operation
7 date: 3/31/06 revg sp6683 1x/1.5x charge pump led driver for flash or backlight ? copyright 2006 sipex corporation application information camera flash application camera flash/torch application configuring as cellphone camera flash driver sp6683 is capable of delivering up to 200ma current, which is perfect to drive the most common leds in today's market. it is designed to work in the cell phone camera flash which powers up directly from the lithium-ion battery. configuring as lcd backlight the sp6683 is able to efficiently drive up to eight 20ma white leds in parallel and maintain a constant brightness over a very wide operating voltage range (2.7v to 5.5v) programming x1 or x1.5 operating mode for simplest application circuitry, sp6683's mode can be fixed by connecting v mode to v in for x1 mode or connecting v mode to gnd for x1.5 mode. the sp6683 can automatically change from x1 mode to x1.5 to maximize efficiency. to use this feature, divider resistors should be chosen according to the specific ap- plication, as shown below. v in v in c2 gnd 4 v mode r1 sp6683 8 r2 3 programming the vmode resistors configuring as camera flash + torch driver the sp6683 can be configured as a flash/ torch led driver which in some applications require constant torch current used for mo- tion pictures (i.e. movie mode). lcd backlight application sp6683 1 vout c1p 2 vin 3 vmode 4 fb 5 10 c2p c1n 9 gnd 8 c2n 7 en/pwm 6 en/pwm c1 2.2uf 6.3v/0603 c2 1uf 6.3v/0603 c4 6.3v/0603 c3 1uf 6.3v/0603 led1 rb 1.5 ohm 1% / 0603 vin 2.7v~4.2v io=vfb/rb 2.2uf sp6683 v out c1p v in v mode fb c2p c1n gnd c2n en/pwm 1 2 3 4 5 10 9 8 7 6 c2 1 f c4 1 f c5 1 f r6 20 c1 1 f lithium -ion enable whi te led 20 2.7 - 4.2v sp6683 v out c1p v in v mode fb c2p c1n gnd c2n en/pwm 1 2 3 4 5 10 9 8 7 6 c2 c4 c5 r b 1 c1 lithium ion enable d1 white led r1 1m ? 3.0 - 4.2v r b2 r2 1m ? flash 1 f 2.2 f 1 f 2.2 f torch mode: vf=3.2v , enable = high, flash = low. flash mode: vf=3.3v, enable = high, flash = high. 0 50 100 150 200 250 300 350 400 3.2 3.4 3.6 3.8 4.0 4.2 vin (v) iout (ma) flash mode torch mode figure 13. i out vs. v in
8 date: 3/31/06 revg sp6683 1x/1.5x charge pump led driver for flash or backlight ? copyright 2006 sipex corporation configuring the sp6683 as voltage or current source the white led load configuration used by customers can be discrete white leds or a white led module. inside the white led module, there may or may not be resistors in series with the white leds. according to the different application requirements, the sp6683 can be configured as either a voltage source or a current source to provide solutions for these different applications, as shown below. the figure shows the sp6683 driving discrete white leds as a current source. the current in one white led current is set by the ratio of the feedback pin voltage (315mv) and the bias resistor r b . to set the operating current, r b can be selected by: r b = v fb i led the current of the remaining white leds is set according to the similarity of the white leds. 3-wire white led modules with internal series resistors (as shown in figure below ) can also be driven in this way. application information 1 8 5 rb sp6683 rb 2.2uf gnd fb v out driving discrete white leds as current source in the figure above, the sp6683 was used to drive a 2-wire white led module (without internal series resistors) as a current source. the bias resistor r b is selected to regulate the total current of the white led module instead of the current of a single led as in the figure showing the 3 wire white led module. 3-wire white led module driving 2-wire white led module as current source driving 2-wire white led module as voltage source 3-wire w-led module anode fb gnd gnd v out anode 5 v fb rb sp6683 cathode 8 2-wire w-led module 1 anode 5 8 sp6683 cathode v out r6 1 r5 2.2uf v fb 2-wire w-led module gnd
9 date: 3/31/06 revg sp6683 1x/1.5x charge pump led driver for flash or backlight ? copyright 2006 sipex corporation the sp6683-03er has the discharge mosfet disabled ensuring that the output node is at high impedance during shutdown. this can be useful if the system is feeding led current from an- other source while the sp6683 is in shutdown. the sp6683-lv offers a lower reference volt- age that allows to reduce efficiency loss occur- ring in the current sense resistor. this part is ideal for driving single leds for flash applica- tions. reducing component count it is possible to reduce the number of external components by shorting pins 2 & 9 and omitting the flying capacitor. in this mode, the charge pump operates in a "quasi" doubler mode. this reduces efficiency but does allow for one less external capacitor. this circuit is recommended only when input and output voltages have similar range, which is very common when driving white leds from a li-io battery. flying cap removed in this application, the bias resistor can be se- lected by: r b = v fb i led (total) where i led(total) is the total operating current of all the white leds. to use sp6683 as a voltage source for fixed voltage applications, a voltage divider is need to program the output voltage, as shown in the figure above. the output voltage is set by the ratio of the two resistors and the feedback control volt- age as shown by: v out = ( 1 + r 5 ) ?v fb r 6 brightness control using pwm dimming control can be achieved by applying a pwm control signal to the en/pwm pin. the brightness of the white leds is controlled by increasing and decreasing the duty cycle of the pwm signal. while operating frequency range is from 60hz to 700hz, the recommended maxi- mum brightness frequency range is from 60hz to 200hz. a repetition rate of at least 60hz is required to prevent flicker. three options for optimization the sp6683 family includes three options that allow the user to optimize the led driving circuit. the sp6683 includes an on-board dis- charge switch that ensures that v out is com- pletely discharged in shutdown. this feature is very useful in systems using pwm dimming, when the sp6683 is periodically turned on and off. the discharge switch ensures that the fall- ing and rising edges of the led current have similar durations. application information sp6683 1 vout c1p 2 vin 3 vmode 4 fb 5 10 c2p c1n 9 gnd 8 c2n 7 en/pwm 6 en/pwm c1 2.2uf 6.3v/0603 c4 6.3v/0603 c3 1uf 6.3v/0603 led1 rb 1.5 ? 1% / 0603 vin 2.7v~4.2v io=vfb/rb 2.2uf
10 date: 3/31/06 revg sp6683 1x/1.5x charge pump led driver for flash or backlight ? copyright 2006 sipex corporation component selection the guideline for selecting divider resistors is as follows. for high input voltage, the sp6683 will work in x1 mode. when the input voltage drops to v th threshold voltage, it will switch to x1.5 mode automatically. the v th threshold voltage for mode change can be calculated by: v th = (v f + 0.315 + m ?i led ?r out ) where v f and m are the forward voltage and number of the white leds, rout is the output resistance of the sp6683. the equation for the voltage divider r 1 and r 2 with v mode = 1.25v is: v th = 1.25v ?(1+r 1 /r 2 ) which can be expressed as r 1: r 1 = [ (v th /1.25) - 1 ] r 2 for the typical sp6683 application, using v f = 3.6v, m = 8, i led = 15ma, r out = 6 ? , v th will be 4.63v, select r 2 = 100k ? , then r 1 = 270k ? suggested low esr capacitors manufacturers/ website part number capacitance/ volta g e capacitor size/t yp e/thickness esr at 100khz tdk/www.tdk.com c1005x5r0j105m 1uf/6.3v 0402/x5r/0.5mm 0.03 tdk/www.tdk.com c1608x5r0j225k 2.2uf/6.3v 0603/x5r/0.9mm 0.02 murata/www.murata.com grm155r60j105ke19b 1uf/6.3v 0402/x5r/0.55mm 0.03 murata/www.murata.com grm188r61a225ke34b 2.2uf/6.3v 0603/x5r/0.9mm 0.02 application information ceramic capacitors are recommended for their inherently low esr, which will help produce low peak-to-peak output ripple, and reduce high frequency spikes. the fly capacitor controls the strength of the charge pump. selection of the fly capacitor is a tradeoff between the output voltage ripple and the output current capability. decreasing the fly capacitor will reduce the output voltage ripple because less charge will be delivered to the output capacitor. however, a smaller fly capaci- tor leads to larger output resistance, thus de- creasing the output current capability and the efficiency of the circuit. increasing the value of the input and output capacitors could further reduce the input and output ripple. for back- lighting applications up to 80ma output current, c in = c out = 1 f is typically used. for appli- cations with more than 80ma output current, for example in flash applications where iout can be as much as 200ma, c in = c out = 2.2 f is recommended. for peak performance, place all capacitors as close to the sp6683 as possible. refer to table 1 below for some suggested low esr capacitors.
11 date: 3/31/06 revg sp6683 1x/1.5x charge pump led driver for flash or backlight ? copyright 2006 sipex corporation application information brightness matching for white leds, the forward voltage drop is a function of the operating current. however, for a given current, the forward voltage drop across each led does not always match exactly. this can cause uneven brightness in the white leds. in the figure below, assuming high-precision bias resistors were used, the operating current ratio of two different branches can be easily derived as shown by: i 1 = v out - v f1 i 2 v out - v f2 where i 1 & i 2 are the operating current of the white leds, where v f1 & v f2 are the forward voltage of the white leds. since the brightness of the white led is propor- tional to the operating current, for better bright- ness matching, a higher output voltage could be rb1 8 v fb d1 rb dn gnd vfn vf1 v out 1 rb2 rb vf2 rb 5 d2 sp6683 i 1 i 2 i n improving brightness matching used. this could be done by using a larger resistor, as shown in the figure below. rb2 is used to bias the operating current of the white led, rb1 is use to increase the output voltage. better brightness matching was achieved at the cost of the power wasted on the bias resistor. power efficiency the efficiency of driving the white leds can be calculated by = v f ?i f = v f ?i f v f v i ? i v i (n ?i f + i q ) v i ?n where v i & i i are input voltage and current; v f & i f are the forward voltage and operating current of the white led; i q is quiescent current, which is considered small compared with i f .
12 date: 3/31/06 revg sp6683 1x/1.5x charge pump led driver for flash or backlight ? copyright 2006 sipex corporation application information c2 1uf vin: 3.0 - 4.2v d1 lumiled c4 1uf r3 1.0m c5 2.2uf flash 200ma s hdn rb 1.5 oh m, 0603 sp 6683 vou t 1 c1p 2 c2n 7 en/ pwm 6 fb 5 vm ode 4 vin 3 gnd 8 c1n 9 c2p 10 c1 2.2uf r1 205k r2 100k r1 = (vth res /1. 25 - 1)*r2 r1 = 174k for 100ma vthres = 3.4v r1 = 205k for 200ma vthres = 3.8v sp6683 li-ion input in 1x to 1.5x mode to lumiled pwf1 output current: 1x-1.5x cin = cout = 2.2uf 0 50 100 150 200 250 300 350 400 3.2 3.4 3.6 3.8 4.0 4.2 vin (v) iout = 200ma efficiency: 1x-1.5x cin = cout = 2.2uf 0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100.0 3.2 3.4 3.6 3.8 4.0 4.2 vin (v) iout = 200ma
13 date: 3/31/06 revg sp6683 1x/1.5x charge pump led driver for flash or backlight ? copyright 2006 sipex corporation package: 10 pin dfn min nom max min nom max a 0.80 0.90 1.00 0.032 0.036 0.039 a1 0.00 0.02 0.05 0.000 0.001 0.002 a3 k 0.20 - - 0.008 - - 0 - 14 0 - 14 b 0.18 0.25 0.30 0.008 0.010 0.012 d d2 2.20 - 2.70 0.087 - 0.106 e e2 1.40 - 1.75 0.056 - 0.069 e l 0.30 0.40 0.50 0.012 0.016 0.020 3x3 10 pin dfn jedec mo-229 variation veed-5 dimensions in millimeters: controlling dimension dimensions in inches conversion factor: 1 inch = 25.40 mm 3.00 bsc 0.119 bsc symbol sipex pkg signoff date/rev: jl aug09-05 / reva 0.20 ref 0.008 ref 0.119 bsc 3.00 bsc 0.020 bsc 0.50 bsc (a3) a1 a seating plane side view 10 12345 9876 index area (d/2 x e/2) bottom view b e l k d2 e2 e2/2 d2/2 pin1 designator to be within this index area (d/2 x e/2) top view d e e/2 d/2
14 date: 3/31/06 revg sp6683 1x/1.5x charge pump led driver for flash or backlight ? copyright 2006 sipex corporation part number operating temperature range package type sp6683er .................................................. -40 c to +85 c ........................................................... 10 pin dfn sp6683er/tr ............................................ -40 c to +85 c ........................................................... 10 pin dfn sp6683-03er ............................................. -40 c to +85 c ........................................................... 10 pin dfn sp6683-03er/tr ......................................... -40 c to +85 ..................................................... .......10 pin dfn sp6683er-l ............................................... -40 c to +85 c ................................. (lead free).......10 pin dfn sp6683er-l/tr ......................................... -40 c to +85 c ................................. (lead free).......10 pin dfn sp6683-03er-l ......................................... -40 c to +85 c ................................. (lead free).......10 pin dfn sp6683-03er-l/t r ................................... -40 c to +85 c ................................. (lead free).......10 pin dfn *contact factory for availability of the following parts sp6683lver .............................................. -40 c to +85 c ........................................................... 10 pin dfn sp6683lver/tr ........................................ -40 c to +85 c ........................................................... 10 pin dfn ordering information /tr = tape and reel pack quantity is 3000 for dfn. sipex corporation headquarters and sales office 233 south hillview drive milpitas, ca 95035 tel: (408) 934-7500 fax: (408) 935-7600 solved by sipex tm sipex corporation reserves the right to make changes to any products described herein. sipex does not assume any liability aris ing out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor t he rights of others.

▲Up To Search▲

Price & Availability of SP6683ERTR

	To Download SP6683ERTR Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .