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data sheet 1 oct. 2009 rev. 2. 1 bcd semiconductor manufacturing limited white led step-up converter ap3019 general description the ap3019 is an inductor-based dc/dc converter designed to drive up to five white leds in series for backlight. only one feedback resistor is needed to con- trol the led current and obtain required brightness. a constant frequency 1.0mhz pwm control scheme is employed in this ic, which means tiny external com- ponents can be used. in fact, 1mm tall inductor and 0.22 f output capacitor for a typical application is suf- ficient. additionally, the schottky diode in boost circuit is integrated on this chip. ap3019 also provides a dis- able pin to ease its use for different systems. the over output voltage protection is equipped in ap3019. when any led is broken or in other abnor- mal conditions, the output voltage will be clamped. the ap3019 is available in standard sot-23-6 and tsot-23-6 packages. features inherently uniform led current high efficiency up to 84% no need for external schottky diode over output voltage protection fast 1.0mhz switching frequency uses tiny 1mm tall inductor requires only 0.22 f output capacitor applications cellular phones digital cameras lcd modules gps receivers pdas, handheld computers figure 1. package types of ap3019 sot-23-6 tsot-23-6
data sheet 2 oct. 2009 rev. 2. 1 bcd semiconductor manufacturing limited white led step-up converter ap3019 figure 2. pin configuration of ap3019 (top view) pin configuration pin description pin number pin name function 1 sw switch pin. connect external inductor 2 gnd ground pin 3 fb voltage feedback. re ference voltage is 200mv 4 ctrl shutdown and dimming pin. connect to 1.8v or higher to enab le device; connect to 50mv or less to disable device; connect to a voltage between 1.8v and 50mv to achieve linear dim- ming 5v out output pin. connected to the ca thode of internal schottky diode 6v in input supply pin. must be locally bypassed (sot-23-6/tsot-23-6) sw gnd fb v in v out ctrl k/kt package 1 2 34 5 pin 1 dot by marking 6
data sheet 3 oct. 2009 rev. 2. 1 bcd semiconductor manufacturing limited white led step-up converter ap3019 functional block diagram figure 3. functional block diagram of ap3019 gnd fb v in sw circuit type package k: sot-23-6 e1: rohs ap3019 - tr: tape and reel ordering information v out ctrl q1 a2 a1 r s q 1.0 mhz oscillator ramp generator v ref 3 6 4 2 5 driver 1.25 v comparator ovp 200 mv 1 soft start kt: tsot-23-6 package temperature range part number marking id packing type sot-23-6 -40 to 85 o c AP3019KTR-E1 e9s tape & reel tsot-23-6 -40 to 85 o c ap3019kttr-e1 s9e tape & reel bcd semiconductor's products as desi gnated with "e1" suffix in the part number are rohs compliant.
data sheet 4 oct. 2009 rev. 2. 1 bcd semiconductor manufacturing limited white led step-up converter ap3019 parameter symbol value unit input voltage v in 20 v sw voltage 38 v fb voltage 20 v ctrl voltage 20 v thermal resistance (junction to atmosphere, no heat sink) ja 265 o c/w operating junction temperature 150 o c storage temperature range t stg -65 to 150 o c lead temperature (soldering, 10sec) t lead 260 o c esd (machine model) 250 v esd (human body model) 2000 v note 1: stresses greater than those listed under "absolute maximum ratings" may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any ot her conditions beyond those ind i- cated under "recommended operating conditi ons" is not implied. exposure to "a bsolute maximum ratings" for extended periods may affect device reliability. parameter symbol min max unit operating temperature range t op -40 85 o c input voltage v in 2.5 16 v ctrl voltage v ctrl 16 v recommended operating conditions absolute maximum ratings (note 1)
5 oct. 2009 rev. 2. 1 bcd semiconductor manufacturing limited white led step-up converter ap3019 data sheet (v in =3v, v ctrl =3v , t a =25 o c, unless otherwise specified.) parameter symbol conditions min typ max unit minimum operating voltage v in (min) 2.5 v maximum operating voltage v in (max) 16 feedback voltage v fb i out =20ma, 4 leds, t a =-40 o c to 85 o c 188 200 212 mv fb pin bias current i fb 35 100 na supply current i cc v fb =v in , no switching 2.0 3.1 ma shutdown quiescent current i q v ctrl =0v 2.0 3.2 5.0 a switching frequency f 1.0 mhz maximum duty cycle d max 90 93 % switch current limit (note 2) i limit t a =25 o c, d=40% 500 ma t a =25 o c, d=80% 350 switch v ce saturation voltage v cesat i sw =250ma 360 mv switch leakage current v sw =5v 0.01 5 a ctrl pin voltage v ctrl high 1.8 v low 0.05 ctrl pin bias current i ctrl 40 55 72 a t a =85 o c 50 t a =-40 o c 75 ovp voltage v ov 29 v schottky forward drop v drop i d =150ma 0.7 v schottky leakage current reverse voltage v r =23v 0.1 4 a reverse voltage v r =27v 150 soft start time t 300 s thermal resistance (junction to case) jc sot-23-6 60 o c/w tsot-23-6 60 electrical characteristics note 2: the switch current limit is related to duty cycle. please refer to figure 15 for detail.
data sheet 6 oct. 2009 rev. 2. 1 bcd semiconductor manufacturing limited white led step-up converter ap3019 typical performance characteristics figure 6. efficiency vs. led's number figure 7. schottky forward current figure 4. efficiency vs. junction temperature figure 5. efficiency vs. input voltage vs. schottky forward drop (v f of wled is 3.45v @ i f =20ma, unless otherwise noted ) -50 -25 0 25 50 75 100 80 81 82 83 84 85 efficiency (%) v in =3.6v, i out =20ma, 4leds c in =1 f, c out =0.22 f, l=22 h junction temperature ( o c) 2.5 3.0 3.5 4.0 4.5 5.0 80 81 82 83 84 85 i out =20ma, 4leds, t a =25 o c c in =1 f, c out =0.22 f, l=22 h efficiency (%) input voltage (v) 0 200 400 600 800 1000 0 50 100 150 200 250 300 350 schottky forward current (ma) schottky forward drop (mv) 2345 80 81 82 83 84 85 v in =3.6v, i out =20ma, t a =25 o c c in =1 f, c out =0.22 f, l=22 h efficiency (%) leds (pcs)
7 oct. 2009 rev. 2. 1 bcd semiconductor manufacturing limited white led step-up converter ap3019 data sheet typical performance ch aracteristics (continued) figure 10. input current in output open circuit figure 8. shutdown quiescent current vs. input voltage vs. input voltage figure 9. supply current vs. input voltage (v f of wled is 3.45v @ i f =20ma, unless otherwise noted ) 246810121416 0 5 10 15 20 25 30 quiescent current ( a) input voltage (v) 0 2 4 6 8 10 12 14 16 0.0 0.5 1.0 1.5 2.0 2.5 3.0 supply current (ma) input voltage (v) -50 o c 25 o c 100 o c 2.5 3.0 3.5 4.0 4.5 5.0 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0 input current (ma) input voltage (v) figure 11. switching frequency vs. junction temperature -50 -25 0 25 50 75 100 0.70 0.75 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 frequency (mhz) junction temperature ( o c)
data sheet 8 oct. 2009 rev. 2. 1 bcd semiconductor manufacturing limited white led step-up converter ap3019 figure 13. schottky forward drop typical performance ch aracteristics (continued) figure 12. feedback voltage vs. junction temperature vs. junction temperature figure 14. schottky leakage current vs. junction temperature (v f of wled is 3.45v @ i f =20ma, unless otherwise noted ) -50 -25 0 25 50 75 100 0.60 0.62 0.64 0.66 0.68 0.70 0.72 0.74 0.76 0.78 0.80 schottky forward drop (v) junction temperature ( o c) -50 -25 0 25 50 75 100 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 schottky leakage current ( a) junction temperature ( o c) v r =10v v r =16v v r =23v -50 -25 0 25 50 75 100 190 192 194 196 198 200 202 204 206 208 210 feedback voltage (mv) junction temperature ( o c) figure 15. switch curren t limit vs. duty cycle 30 40 50 60 70 80 90 100 200 300 400 500 600 700 -50 o c 25 o c 100 o c current limit (ma) duty cycle (%)
9 oct. 2009 rev. 2. 1 bcd semiconductor manufacturing limited white led step-up converter ap3019 data sheet typical performance ch aracteristics (continued) figure 16. switch saturation voltage vs. switch current figure 17. feedback voltage vs. ctrl pin voltage (v f of wled is 3.45v @ i f =20ma, unless otherwise noted ) 50 100 150 200 250 300 100 150 200 250 300 350 400 450 500 saturation voltage (mv) switch current (ma) 0.0 0.5 1.0 1.5 2.0 0 50 100 150 200 250 ctrl voltage (v) feedback voltage (mv)
data sheet 10 oct. 2009 rev. 2. 1 bcd semiconductor manufacturing limited white led step-up converter ap3019 application information operation the ap3019 is a boost dc-dc converter which uses a constant frequency, current mode control scheme to provide excellent line and load regulation. operation can be best understood by referring to the figure 3. at the start of each oscillator cycle, the sr latch is set and switch q1 turns on. the switch current will increase linearly. the voltage on sense resistor is proportional to the switch current. the output of the current sense amplifier is added to a stabilizing ramp and the result is fed into the non-inversion input of the pwm comparator a2. when this voltage exceeds the output voltage level of the error amplifier a1, the sr latch is reset and the switch is turned off. it is clear that the voltage level at inversion input of a2 sets the peak current level to keep the output in regulation. this voltage le vel is the output signal of error amplifier a1, and is the amplified signal of the voltage difference between feedback voltage and reference voltage of 200mv. so, a constant output current can be provided by this operation mode. figure 18. typical application circuit to decide r1 led current control refer to figure 18, the led current is controlled by the feedback resistor r1. leds' current accuracy is determined by the regulat or's feedback threshold accuracy and is independen t of the led's forward voltage variation. so the pr ecise resistors are preferred. the resistance of r1 is in inverse proportion to the led current since the feedback reference is fixed at 200mv. the relation for r1 and led current can be expressed as below: over voltage protection the ap3019 has an internal open-circuit protection circuit. when the leds are disconnected from circuit or fail open, the output voltage is clamped. the ap3019 will switch at a low frequency, and minimize input current. soft start the ap3019 has an internal soft start circuit to limit the inrush current during startup. the time of startup is controlled by internal soft start capacitor. please refer to figure 19. figure 19. soft start waveform v in =3.6v, 4leds, i led =20ma dimming control two typical types of dimming control circuit are present as below. first, controlling ctrl pin voltage to change operation state is a good choice. second, changing the feedback voltage to get appropriate duty and luminous intensity is also useful. (1). adding a control signal to ctrl pin there are three methods to control ctrl pin signal first, adding a pwm signal to ctrl pin directly. the ap3019 is turned on or off by the pwm signal when it is applied on the ctrl pin. the typical frequency of led i mv r 200 1 = i in 100ma/div v out 10v/div v ctrl 2v/div time 100 s/div l1 c1 c2 r1 v in sw v out fb gnd ctrl ap3019 control signal v in 3v
data sheet 11 oct. 2009 rev. 2. 1 bcd semiconductor manufacturing limited white led step-up converter ap3019 application information (continued) this pwm signal can be up to 2khz. please refer to figure 20. figure 20. dimming control using a pwm signal in ctrl pin secondly, adding a constant dc voltage through a resistor divider to ctrl pin can control the dimming. the fb voltage is indirect ly adjusted when the ctrl pin voltage is between 50mv to 1.8v, which can be used as dimming control. please refer figure 21. figure 21. dimming control using a dc voltage in ctrl pin thirdly, using a filtered pwm signal adding to ctrl pin can achieve dimming control. the filtered pwm signal can be considered as an adjustable dc voltage. it will change the fb vol tage indirectly and achieve dimming control. the circuit is shown in figure 22. figure 22. dimming control using a filtered pwm signal voltage in ctrl pin (2). changing the eff ective feedback voltage there are three methods to change the effective feedback voltage. first, adding a constant dc voltage through a resistor divider to fb pin can control the dimming. changing the dc voltage or resistor between the fb pin and the dc voltage can get appropriate luminous intensity. comparing with all kinds of pwm signal control, this method features a stable output voltage and leds current. please refer figure 23. figure 23. dimming control using dc voltage second, using a filtered pwm signal can do it. the filtered pwm signal can be considered as a varying and adjustable dc voltage. figure 24. dimming control using a filtered pwm voltage third, using a logic signal to change the feedback voltage. for example, the fb pin is connected to the gnd through a mosfet and a resistor. and this mosfet is controlled a logic signal. the luminous intensity of leds will be changed when the mosfet turns on or off. up to 2khz ap3019 ctrl ap3019 ctrl r1 10k r2 10k v dc 0.1 to 3.6v ap3019 ctrl pwm r 5k c 100nf r1 10 ? fb ap3019 r2 5k r3 90k pwm r4 10k c 0.1 f effective feedback voltage r1 10 ? fb ap3019 r2 5k r3 90k v dc effective feedback voltage
data sheet 12 oct. 2009 rev. 2. 1 bcd semiconductor manufacturing limited white led step-up converter ap3019 application information (continued) figure 25. dimming control using logic signal r1 fb ap3019 r2 logic signal 2n7002 effective feedback voltage
13 oct. 2009 rev. 2. 1 bcd semiconductor manufacturing limited white led step-up converter ap3019 data sheet typical application a. four white leds driver b. five white leds driver 22 ? 1 f 0.22 f 10 ? v in sw v out fb gnd ctrl ap3019 control signal v in 3v 10 ? 1 f 0.22 f 10 ? v in sw v out fb gnd ctrl ap3019 control signal v in 3v figure 26. typical white led drivers c: x5r or x7r dielectric l: sumida cdrh5d28r-220nc or equivalent this circuit can work in full temperature c: x5r or x7r dielectric l: sumida cdrh5d28r-100nc or equivalent this circuit can work in full temperature
data sheet 14 oct. 2009 rev. 2. 1 bcd semiconductor manufacturing limited white led step-up converter ap3019 mechanical dimensions sot-23-6 unit: mm(inch) 2.820(0.111) 3.020(0.119) 2.650(0.104) 2.950(0.116) 1.500(0.059) 1.700(0.067) 0.950(0.037)typ 1.800(0.071) 2.000(0.079) 0.300(0.012) 0.400(0.016) 0.700(0.028)ref 0.100(0.004) 0.200(0.008) 0 8 0.200(0.008) 0.300(0.012) 0.600(0.024) 0.000(0.000) 0.100(0.004) 0.900(0.035) 1.300(0.051) 1.450(0.057) max 123 4 5 6 pin 1 dot by marking
data sheet 15 oct. 2009 rev. 2. 1 bcd semiconductor manufacturing limited white led step-up converter ap3019 mechanical dimens ions (continued) tsot-23-6 unit: mm(inch) 2.800(0.110) 3.000(0.118) 1.500(0.059) 1.700(0.067) 2.600(0.102) 3.000(0.118) 0.950(0.037) bsc 1.900(0.075) bsc 0.700(0.028) 0.900(0.035) 0.000(0.000) 0.100(0.004) 0.350(0.014) 0.510(0.020) 0 8 0.370(0.015) min 0.100(0.004) 0.250(0.010) 0.250(0.010) bsc gauge plane r0.100(0.004) min pin 1 dot by marking 1.000(0.039) max
important notice bcd semiconductor manufacturing limited reserves the right to make changes without further not ice to any products or specifi- cations herein. bcd semiconductor manufacturing limited does not as sume any responsibility for us e of any its products for any particular purpose, nor does bcd semiconductor manufacturi ng limited assume any liability aris ing out of the application or use of any its products or circui ts. bcd semiconductor manufacturing limited does not convey any license under its patent rights or other rights nor the rights of others. - wafer fab shanghai sim-bcd semiconductor manufacturing co., ltd. 800 yi shan road, shanghai 200233, china tel: +86-21-6485 1491, fax: +86-21-5450 0008 main site regional sales office shenzhen office shanghai sim-bcd semiconductor manuf acturing co., ltd., shenzhen office room e, 5f, noble center, no.1006, 3rd fuzhong road, futian district, shenzhen, 518026, china tel: +86-755-8826 7951 fax: +86-755-8826 7865 taiwan office bcd semiconductor (taiwan) company limited 4f, 298-1, rui guang road, nei-hu district, taipei, taiwan tel: +886-2-2656 2808 fax: +886-2-2656 2806 usa office bcd semiconductor corp. 30920 huntwood ave. hayward, ca 94544, usa tel : +1-510-324-2988 fax: +1-510-324-2788 - headquarters bcd semiconductor manufacturing limited no. 1600, zi xing road, shanghai zizhu sc ience-based industrial park, 200241, china tel: +86-21-24162266, fax: +86-21-24162277 bcd semiconductor manufacturing limited important notice bcd semiconductor manufacturing limited reserves the right to make changes without further not ice to any products or specifi- cations herein. bcd semiconductor manufacturing limited does not as sume any responsibility for us e of any its products for any particular purpose, nor does bcd semiconductor manufacturi ng limited assume any liability aris ing out of the application or use of any its products or circui ts. bcd semiconductor manufacturing limited does not convey any license under its patent rights or other rights nor the rights of others. - wafer fab shanghai sim-bcd semiconductor manufacturing limited 800, yi shan road, shanghai 200233, china tel: +86-21-6485 1491, fax: +86-21-5450 0008 bcd semiconductor manufacturing limited main site regional sales office shenzhen office shanghai sim-bcd semiconductor manuf acturing co., ltd. shenzhen office advanced analog circuits (shanghai) corporation shenzhen office room e, 5f, noble center, no.1006, 3rd fuzhong road, futian district, shenzhen 518026, china tel: +86-755-8826 7951 fax: +86-755-8826 7865 taiwan office bcd semiconductor (taiwan) company limited 4f, 298-1, rui guang road, nei-hu district, taipei, taiwan tel: +886-2-2656 2808 fax: +886-2-2656 2806 usa office bcd semiconductor corporation 30920 huntwood ave. hayward, ca 94544, u.s.a tel : +1-510-324-2988 fax: +1-510-324-2788 - ic design group advanced analog circuits (shanghai) corporation 8f, zone b, 900, yi shan road, shanghai 200233, china tel: +86-21-6495 9539, fax: +86-21-6485 9673 bcd semiconductor manufacturing limited http://www.bcdsemi.com bcd semiconductor manufacturing limited

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