AL3158 high efficiency 1x/2x charge pump for white led applications AL3158 document number: ds35047 rev. 1 - 2 1 of 10 www.diodes.com september 2010 ? diodes incorporated new product description the AL3158 is a low noise, constant frequency charge pump dc/dc converter that uses a dual mode load switch (1x), and (2x) conversion for white led applicat ions. the AL3158 is capable of driving three groups of three led channels at 20ma from a 2.7v to 5.5v input. the current sinks may be operated using three simple pwm dimming inputs individually or in parallel for driving higher- current leds. low external part counts (one 1f flying capacitor and two 2.2f capacitors at v in and v out ) make this part ideally suited for small, battery-powered applications. AL3158 pwm dimming inputs are used to enable, disable device and dimming led current with a fixed default current settings at 20ma or other factory programming options available. each output of the AL3158 is equipped with built-in protection for v out short circuit and auto-disable fo r led short conditions. built-in soft-start circuitry prevents excessive inrush current during start-up and mode switching. a low-current shutdown feature disconnects the load from v in to reduce quiescent current less than 1a. the AL3158 is available in a lead- free, space-saving, thermally enhanced 20-pin 3 x 3mm qfn package. features ? v in range: 2.7v to 5.5v ? up to 93% max power efficiency ? 1% current matching accuracy between channels ? three simple pwm dimming for rgb or wled ? low transition threshold voltage typical 150 mv ? dual-mode 1x and 2x charge pump ? drives up to 3 + 3 + 3 channels of leds ? 1.2 mhz constant switching frequency ? v out short circuit and thermal protections ? soft start for reducing inrush current ? under voltage lockout protection ? i q <1a in shutdown ? thermally-enhanced qfn3030-20 package: available in ?green? molding compound (no br, sb) ? lead free finish/ rohs compliant (note 1) pin assignments applications ? mobile phone white led backlighting and indicators ? pda white led backlighting ? battery-operated phone main and sub screen white led backlighting notes: 1. eu directive 2002/95/ec (rohs). a ll applicable rohs exemptions app lied. please visit our website at http://www.diodes.com/products/lead_free.html typical application circuit v in 2.2uf c in AL3158 c p c n v out d4 d1 d2 d3 pgnd 3 8 v in 1uf c 1 7 9 6 11 15 d1 led 14 d2 led 13 d3 led 12 d4 led 2.2uf c out 5 d5 d6 d7 d8 d9 d5 led d6 led d7 led d8 led d9 led 16 18 20 1 2 4 gnd 17 en1 en2 en3 en1 en2 en3 en1 en2 en3
AL3158 high efficiency 1x/2x charge pump for white led applications AL3158 document number: ds35047 rev. 1 - 2 2 of 10 www.diodes.com september 2010 ? diodes incorporated new product pin descriptions pin name pin number description d8 1 current sink input #8. co nnected to vout when un-used. d9 2 current sink input #9. co nnected to vout when un-used. en1 3 enable pin 1 en3 4 enable pin 3 en2 5 enable pin 2 pgnd 6 charge pump switch ground cn 7 negative terminal of flying capacitor vin 8 input power supply. requires 2.2f capacitor between this pin and ground. cp 9 positive terminal of flying capacitor nc 10,19 no-connect v out 11 charge pump output to drive load circuit. requires 2.2f capacitor between this pin and ground. d1 12 current sink input #1. connected to v out when un-used. d2 13 current sink input #2. connected to v out when un-used. d3 14 current sink input #3. connected to v out when un-used. d4 15 current sink input #4. connected to v out when un-used. d5 16 current sink input #5. connected to v out when un-used. d6 18 current sink input #6. connected to v out when un-used. gnd 17 ground d7 20 current sink input #7. connected to v out when un-used. gnd ep pad exposed pad (bottom). connected to gnd directly underneath the package. functional block diagram
AL3158 high efficiency 1x/2x charge pump for white led applications AL3158 document number: ds35047 rev. 1 - 2 3 of 10 www.diodes.com september 2010 ? diodes incorporated new product absolute maximum ratings (note 2) symbol description rating unit esd hbm human body model esd protection 2 kv esd mm machine model esd protection 200 v v in input voltage -0.3 to 6 v v en1,2,3 en1, en2, en3 to gnd voltage -0.3 to v in +0.3 v i out maximum dc output current 270 ma t j operating junction temperature range 150 c t lead maximum soldering temperature (at leads, 10 sec) 300 c notes: 2. exceeding absolute maximum ratings will cause permanent damage to the device. recommended operating conditions symbol parameter min max unit v in input voltage 2.7 5.5 v t a operating ambient temperature -40 85 c electrical characteristics (t a = 25 c, vin = 3.6v, c in = c out = 2.2f, c 1 = 1f unless otherwise noted) symbol parameter test conditions min typ. max unit i q quiescent current 1x mode, 3.0 v in 5.5, active, no load current 0.3 0.6 ma 2x mode, 3.0 v in 5.5, active, no load current 2 5 i shdn shutdown current en1, en2, en3 = 0 1 a i dx i sink current accuracy (note 3) i set = 20ma (note 4), t a = 25 c 19 20 21 ma i d-match current matching between any two current sink inputs (note 5) v f : d1:d9 = 3.6v 1 2 % r out open loop v out resistance 1x mode 0.5 2 x mode 4.5 v th 1x to 2x transition threshold at any i sink pin i set = 20ma 150 mv v hs mode transition hysteresis 250 mv t ss soft-start time 100 s fsw switching frequency 1.2 mhz v en1, 2,3 (l) en1,2,3 threshold low v in = 2.7v 0.4 v v en1,2,3(h) en1,2,3 threshold high v in = 5.5v 1.4 v t en1,2,3 en1,2,3 off timeout 20 ms uvlo v in under-voltage lockout 1.8 2 2.2 v i en1,2,3 en1,2,3 input leakage -1 1 a t shdn thermal shutdown protection 160 c t hys thermal shutdown hysteresis 10 c ja thermal resistance junction-to- ambient qfn3030-20 (note 6) 52 o c/w notes: 3. determined by the average current levels of all active channels. 4. sequence setting set to gi ve nominal 20ma max output current and 4ma output current. 5. determined by the maximum sink current (m ax), the minimum sink current (min), and the average sink current (av g). two matching numbers are calculated as (max-avg)/avg and (avg-min )/avg. the largest number of the two (worst case) is considered as t he matching data. 6. device mounted on fr-4 substrate, 2"*2 ", 2oz copper, double-sided pc board, with minimum recommended pad on to p layer and 4 vias to bottom layer.
AL3158 high efficiency 1x/2x charge pump for white led applications AL3158 document number: ds35047 rev. 1 - 2 4 of 10 www.diodes.com september 2010 ? diodes incorporated new product typical performance characteristics turn-on to 1x mode 50us/div turn-on to 2x mode 100us/div turn-off from 1x mode 200ms/div turn-off from 2x mode 200ms/div load characteristics in 2x mode 1us/div pwm dimming control (duty cycle=50%) 10us/div vout 2v/div en1,2,3 2v/div v in =4.2v t a =25c i l =20ma iin 200ma/div cp 2v/div vout 2v/div en1,2,3 2v/div iin 200ma/div cp 2v/div v in =3.0v t a =25c i l =20ma cp 2v/div vout 2v/div en1,2,3 2v/div iin 200ma/div cp 2v/div v in =3.0v t a =25c i l =20ma iin 200ma/div v in =4.2v t a =25c i l =20ma en1,2,3 2v/div vout 2v/div v in =3.0v t a =25c i l =20ma vin 200mv ac /div vout 200mv ac /div iin 100ma ac /div iin 100ma/div v in =3.6v freq=20khz duty cycle=50% t a =25c en 3.6v/div idx 50ma/div
AL3158 high efficiency 1x/2x charge pump for white led applications AL3158 document number: ds35047 rev. 1 - 2 5 of 10 www.diodes.com september 2010 ? diodes incorporated new product typical performance char acteristics (continued) v f =3.1v t a =25c i l =20ma v in =3.6v v in =3.6 v v en(h) v en(l) v in =2.7v v in =3.6v channels 1 to 9 channels 1 to 9 t a =25c
AL3158 high efficiency 1x/2x charge pump for white led applications AL3158 document number: ds35047 rev. 1 - 2 6 of 10 www.diodes.com september 2010 ? diodes incorporated new product functional description the AL3158 is a dual-mode high efficiency charge pump (1x and 2x) device, driving three groups of three led channels at 30ma maximum each, intended for white led backlight applications. an internal comparator circuit compares the voltage at each constant current sink input against a reference voltage. to ensure maximum power efficiency, the most appropriate switching mode (1x and 2x) is automatically selected. the AL3158 requires only three external components: one 1f ceramic flying capacitor (c 1 ) for the charge pump, one 2.2f ceramic input capacitor (c in ), and one 2.2f ceramic charge pump output capacitor (c out ). the each output channel of the AL3158 can drive three groups of three individual led channels with a maximum current of fixed manufacture setting (20ma or 30ma) per channel. these can be paralleled to give a total output current of 270ma. disabled current sinks unused current channels must be disabled by connecting the sinks to vout with only a small sense current flowing through the disabled channel. soft-start soft-start is incorporated to prevent excessive inrush current during power-up, mode switching, and transitioning out of stand-by mode. short-circuit protection short-circuit protection function is incorporated to prevent excessive load current when either flying cap terminals or output pin electrically tied to a very lower voltage or ground. over-voltage protection over-voltage protection function is incorporated to limit the output voltage under a safe value to avoid on-chip device breakdown. under-voltage lockout under-voltage lockout feature disables the device when the input voltage drops below uvlo threshold. thermal auto shutdown when the die temperature exceeds the thermal limit, the device will be disabled and enter stand-by mode. the operation resumes whenever the die cools off sufficiently. pwm dimming control the AL3158 provides simple pwm dimming control through enx pins, and the current is adjusted by the duty cycle of the signal applied on enx pin. the recommended pwm frequency is from 200hz to 50khz depending on applications. en<3:1> led on/off control xx0 led1~led3 off xx1 led1~led3 on x0x led4~led6 off x1x led4~led6 on 0xx led7~led9 off 1xx led7~led9 on
AL3158 high efficiency 1x/2x charge pump for white led applications AL3158 document number: ds35047 rev. 1 - 2 7 of 10 www.diodes.com september 2010 ? diodes incorporated new product ordering information package fs : qfn3030-20 al 3158 fs g - 7 packing 7 : tape & reel green g : green device package code packaging (note 7 and 8) 7? tape and reel quantity part number suffix AL3158fsg-7 fs qfn3030-20 3000/tape & reel -7 notes: 7. pad layout as shown on diodes inc. suggested pad layout document ap02001, which c an be found on our website at http://www.diodes.c om/datasheets/ap02001.pdf 8. eu directive 2002/95/ec (rohs). all applicable ro hs exemptions applied. please visit our website at http://www.diodes.com /products/lead_free.html marking information (1) qfn3030-20 (top view) xy x x w y : year : 0~9 x : a~z : green xx : b8 : AL3158 w : week : a~z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week part number package identification code AL3158fsg qfn3030-20 b8
AL3158 high efficiency 1x/2x charge pump for white led applications AL3158 document number: ds35047 rev. 1 - 2 8 of 10 www.diodes.com september 2010 ? diodes incorporated new product package outline dimensions (all dimensions in mm) package type: qfn3030-20 pad layout top view bottom view side view 2.95/3.05 2.95/3.05 0.30/0.40 1.70/1.90 0.57/0.63 0.05 max. 0.15 typ. (pin #1 id) 0.10 c 0.08 c seating plane a b c 0.10 c ab 0.25 a 2x- 0.25 b 2x - 0.16/0.26 0.40 cl pin1 5 20 15 10 1.70/1.90 0.595 typ.
AL3158 high efficiency 1x/2x charge pump for white led applications AL3158 document number: ds35047 rev. 1 - 2 9 of 10 www.diodes.com september 2010 ? diodes incorporated new product taping orientation (note 9) notes: 9. the taping orientation of the other package type can be found on our website at http://www.diodes .com/datasheets/a p02007.pdf
AL3158 high efficiency 1x/2x charge pump for white led applications AL3158 document number: ds35047 rev. 1 - 2 10 of 10 www.diodes.com september 2010 ? diodes incorporated new product important notice diodes incorporated makes no warranty of any kind, express or implied, with regards to this document, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose (and their equivalents under the laws of any jurisdiction). diodes incorporated and its subsidiaries rese rve the right to make modifications, enhanc ements, improvements, corrections or ot her changes without further notice to this document and any product described herein. diodes incorporated does not assume any liabi lity arising out of the application or use of this document or an y product described herein; neither does diodes incorporated convey any license under its patent or trademark rights, nor the rights of othe rs. any customer or user of this document or products desc ribed herein in such applications shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on diodes incorp orated website, harmless against all damages. diodes incorporated does not warrant or accept any liability what soever in respect of any prod ucts purchased through unauthoriz ed sales channel. should customers purchase or use diodes in corporated products for any unintended or unauthorized application, customers shall indemnify and hold diodes incorporated and its representatives har mless against all claims, damages, expenses, and attorney fee s arising out of, directly or indirectly, any claim of personal injury or death a ssociated with such unintended or unauthorized a pplication. products described herein may be covered by one or more united states, international or foreign patents pending. product names and markings noted herein may also be covered by one or more united states, international or foreign trademarks. life support diodes incorporated products are specifica lly not authorized for use as critical co mponents in life support devices or systems without the express written approval of the chief executive officer of diodes incorporated. as used herein: a. life support devices or systems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when pr operly used in accordance with instructions for use provided in the labeling can be reasonably expected to re sult in significant injury to the user. b. a critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. customers represent that they have all necessary expertise in t he safety and regulatory ramifications of their life support dev ices or systems, and acknowledge and agree that they are solely responsi ble for all legal, regulatory and safety-related requirements concerning their products and any use of diode s incorporated products in such safety-cri tical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporated and its repr esentatives against any damages ar ising out of the use of diodes incorporated products in such safety-c ritical, life support devices or systems. copyright ? 2010, diodes incorporated www.diodes.com
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