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ap3154a 120ma high efficien cy white led drive r ap3154a rev. 1 1 of 14 august 2009 www.diodes.com ? diodes incorporated part obsolete ? up to 88% max power efficiency ? wide input voltage range: 2.7v ~ 5.5v ? 1x, 1.5x, and 2x charge - pump modes ? drive up to 4 white leds ? default maximum current setti ng: 2 0m a each channel ? 120ma maximum output current through 4 ch annels ? programmable switching frequency, default 1.2mhz ? spread spectrum control with 10% frequency deviation ? 1 - wire serial digital interface (sdi) or pwm for dimming control ? soft - start during power - up and mode switching ? soft - stop during shutdown ? short - circ uit protection ? over - voltage protection and under - voltage lockout ? low shutdown current < 6 a ? industry - leading low profile package ? lead free package: dfn3030 - 12 ? dfn3030 - 12: available in green molding compound ( n o br, sb) ? lead free finish / rohs compliant (note 1) the ap3154a is a high efficiency charge - pump white led driver with 1x, 1.5x, 2x operating modes. the ap3154a operates on power supplies from 2.7v to 5.5v. it drives up to four channels of white leds while the intensity of each channel is configu red by varying the respective current levels. each channel can supply up to 30ma current. up to four channels can be ganged together to provide maximum load current of 120m a. by default, all 4 channels are set to the minimum current level after the chip is enabled or back from shutdown mode. the serial digital interface (sdi) provides the capability to configure the current for each led channel. some other key features, such as up spread spectrum control, different charge - pump switching frequencies (0.6mhz /1.2mhz/1.8mhz), and pwm dimming control, can also be programmed through the interface. the ap3154a has a built - in soft - start circuit to minimize the inrush current during power - up and mode switching. various protections such as short - circuit, over - voltag e, under - voltage, and thermal shutdown are integrated to ensure system reliability. the quiescent current of ap3154a during shutdown is less than 6 a. ? mobile phone ? pda (personal digital assistant) ? white led backlighting ? camera flash le d lighting ? lcd modules ? portable devices typical application circuit features general description applications v in 1 uf c in ap 3154 a c 2 p c 2 n c 1 n v out d 4 d 1 d 2 d 3 gnd sdi sdi 2 8 v in 1 uf c 2 7 6 1 uf c 1 4 3 c 1 p 9 5 1 d 4 led 12 d 3 led 11 d 2 led 10 d 1 led 1 uf c out
ap3154a 120ma high efficiency white led drive r ap3154a rev. 2 - 4 2 of 14 december 2014 www.diodes.com ? diodes incorporated ordering information device package code packaging (note 2) 7 tape and reel quantity part number suffix ap3154a f g - 7 f dfn3030 - 12 3000/tape & reel - 7 notes: 1. eu directive 2002/95/ec (rohs). all applicable rohs exemptions applied. please visit our website at http://www.diodes.com/products/lead_free.html 2. pad layout as shown on diodes inc. suggested pad l ayout document ap02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf . pin assignment package f : dfn 3030 - 12 ap 3154 a f g - 7 packing 7 : tape & reel green g : green c1 n c2 p v in c2 n v out c1 p d3 d1 gnd 7 6 5 4 3 2 1 10 11 12 9 8 d2 sdi d4 dfn3030-12 exposed pad ( top view )
ap3154a 120ma high efficiency white led drive r ap3154a rev. 2 - 4 3 of 14 december 2014 www.diodes.com ? diodes incorporated pin descriptions pin name pin # description d4 1 current sink in put #4 . connect to v out when un - used. sdi 2 1 - wire serial digital interface input / pwm input c1 p 3 positiv e terminal of f l y in g ca p acito r. connec t a 1f capacitor b e t w e en c 1 p an d c1 n . c1 n 4 negative terminal of f l y in g ca p acito r. v out 5 the char g e pu m p outpu t voltage to d rive lo a d cir c uit. connect a 1f capacitor b e t w e en t h is pin a nd gr o und. c2 p 6 positiv e terminal of f l y in g ca p acito r. connec t a 1f capacitor b e t w e en c 2 p an d c2 n . c2 n 7 negative terminal of f l y in g ca p acito r. v in 8 input p o w e r source . connec t a 1f ca p a ci t o r be t w e en this pin an d ground . gnd 9 ground. d1 10 current sink in put #1. connect to v out when un - used. d2 11 current sink in put #2. connect to v out when un - used. d3 12 current sink in put #3. connect to v out when un - used. gnd ep p ad ex p o s e d p ad (bottom). con n ect to ground underne a th the p a ck a ge. block diagram short circuit protection c 1 n c 1 p c 2 n c 2 p v in gnd current control charge pump switches v out over voltage protection digital control block serial digital interface output voltage regulation & led short circuit detection sdi under voltage lockout bandgap oscillator over temperature protection d 1 d 2 d 3 d 4
ap3154a 120ma high efficiency white led drive r ap3154a rev. 2 - 4 4 of 14 december 2014 www.diodes.com ? diodes incorporated absolute maximum ratings (notes 3) symbol description value units esd hbm human body model esd protection 2 kv esd mm machine model esd p rotection 200 v v in input voltage - 0.3 to 6 v vsdi sdi to gnd voltage - 0.3 to v in + 0.3 v i out maximum dc output current 150 ma p d maximum power dissipation 0.85 w t j operating junction temperature range - 40 to 150 c note s : 3. exceeding absol ute maximum ratings will cause permanent damage to the device. recommended operating conditions symbol parameter min max units v in input voltage 2.7 5.5 v t a operating ambient temperature - 40 85 c
ap3154a 120ma high efficiency white led drive r ap3154a rev. 2 - 4 5 of 14 december 2014 www.diodes.com ? diodes incorporated electrical characteris tics c in = c out = c1 = c2 = 1.0f; t a = 25c, v in = 3.5v. unless otherwise stated . symbol description conditions min typ . max units i q quiescent current 1x mode fosc=1.2mhz, sdi=high, no load 1.2 ma i shdn shutdown current sdi = 0 0.3 6 a i dx i sin k current accuracy (note 4) i sink = 20ma - 10 10 % i d - match current matching (note 5) v f : d1=d2=d3=d4 i d = 2, 20ma 5 % t ss soft - start time 1 ms f clk switching clock frequency 0.6/1.2/1.8 mhz f ssp spread spectrum enabled +10 % v sdi(l) sdi threshold low v in = 2.7v to 5.5v 0.4 v v sdi(h) sdi threshold high v in = 2.7v to 5.5v 1.6 v t slo sdi low time 0.05 50 s t shi sdi high time 0.05 50 s f pwm pwm frequency (range 1) 0.2 1.5 k h z pwm frequency (range 2) 20 30 k h z t pwm pwm si gnal period 1/ f pwm - max 1/ f pwm - min s t plo pwm signal low (led off) 1 t pwm C phi pwm signal high (led on) 1 t pwm C off chip disable (held low) pwm 65 100 ms no pwm 512 800 s t sep interval between sdi sequences (held high) pwm 65 100 ms no pwm 512 800 s i sdi sdi input leakage - 1 1 a i scp v out short to gnd hold current 500 ma ja thermal resistance1 C jc maximum thermal resistance1 C note s : 4. determined by the average current levels of all active channels. 5 . defined as the deviation of any sink current from the average of all active current channels. 6. device mounted on fr - 4 substrate pc board, 2oz copper, with minimum recommended pad layout.
ap3154a 120ma high efficiency white led drive r ap3154a rev. 2 - 4 6 of 14 december 2014 www.diodes.com ? diodes incorporated typical performance characteristics efficiency vs. supply voltag e turn - on to 1x mode (v in = 4.2v; 20ma load) turn - o n from 1.5x mode (v in = 3.5v; 20ma load) turn - on to 2x mode (v in = 2.7v; 20ma load) turn - off from 1.5x mode (v in = 3.5v; 20ma load) current matching vs. temperature
ap3154a 120ma high efficiency white led drive r ap3154a rev. 2 - 4 7 of 14 december 2014 www.diodes.com ? diodes incorporated typical performa nce characteristics (continued) load characteristics (v in = 3.5v; 1.5x mode; 14ma load) load characteristics (v in = 2.7v; 2x mode; 14ma load) load characteristics (v in = 3.5v; 1.5x mode; 20ma load) load characteristics (v in = 2.7v; 2x mode; 20 ma load) load characteristics (v in = 3.5v; 1.5x mode; 30ma load) load characteristics (v in = 3.1v; 2x mode; 30ma load)
ap3154a 120ma high efficiency white led drive r ap3154a rev. 2 - 4 8 of 14 december 2014 www.diodes.com ? diodes incorporated typical performance characteristics (continued) enable threshold high vs. input voltage enable threshold low vs. inp ut voltage pwm dimming operation (v in = 3.5v; 20ma load; duty=1:1; f=1khz) pwm dimming operation (v in = 3.5v; 20ma load; duty=11:1; f=1khz) pwm dimming operation (v in = 3.5v; 20ma load; duty=1:11; f=1khz)
ap3154a 120ma high efficiency white led drive r ap3154a rev. 2 - 4 9 of 14 december 2014 www.diodes.com ? diodes incorporated function al description general functional description the ap3154a is designed for white led 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 switc hing mode (x1, x1.5, x2) is automatically selected. in applications, only four external components are required: two 1f ceramic flying capacitors (c 1 and c 2 ), one 1f ceramic capacitor each for input and output (c in , c out ). ap3154a drives up to four wh ite leds with a maximum current of 30ma each. a total of 120ma is provided to the four channels. through sdi, the current into each channel can be configured in accordance to specific protocol and pre - defined values. maximum output current can be set to one of the four possible scales: 2ma, 14ma, 20ma, 30ma. among these, the 2ma setting is called low current mode. this would be useful for applications which require very low operating current, e.g. transmissive lcd panels. for each maximum output c urrent scale, there are 16 current level settings separated from one another by approximately 1db. while level - 16 corresponds to maximum current output, level - 1 corresponds to zero output current. as the current level varies logarithmically, intensity of the led changes in a linear fashion. by default, all 4 channels are set to current level 1 (minimum current level) after the chip is enabled or back from shutdown mode. the current level at the individual channels is configured via sdi which supports dat a rate up to 10mhz. it allows the main controller in the system to be offloaded to perform more mission - critical functions. serial digital interface sdi is a general purpose 1 - wire digital interface designed to transport digital controls for power mana gement ics such as ap3154a . the current levels of the four channels can be configured either together or individually. up to 16 current levels are allowed. a generic system controller can easily support the sdi protocol via bit - banging over its general purpose i/os. the sdi protocol is simple yet flexible enough to accommodate different switching clock frequencies. any sequence of negative - edged pulses of 63 or less (see table 1), separated by t sep at the sdi pin is interpreted by ap3154a as a channel c onfiguration event. in the future, the number of pulses can be extended to support additional commands. in addition to the sdi protocol, dimming control can also be achieved by presenting a timing - specific pwm signaling at the sdi pin. number of falli ng edges command description 1 current level step up (1 up to level 16) 2 current level step down (16 down to level 1) 3 current level set to 16 (maximum current level) 4 current level set to 1 (minimum current level) 5 all 4 channels in dimming contr ol 6 ch2, ch3 and ch4 in dimming control 7 ch1 and ch2 in dimming control 8 ch3 and ch4 in dimming control 9 ch1 in dimming control 10 ch2 in dimming control 11 ch3 in dimming control 12 ch4 in dimming control 13 low - current mode (maximum current s et to 2ma) 14 maximum current set to 14ma (all channels) 15 maximum current set to 20ma (all channels) 16 maximum current set to 30ma (all channels) 17 10% up spread spectrum control enable/disable 18 switching frequency set to 0.6mhz 19 switching fr equency set to 1.2mhz 20 switching frequency set to 1.8mhz 21~62 reserved 63 pwm dimming control enable/disable dimming control current level setting ap3154a supports four maximum output current scales including 30 ma, 20ma, 14ma, and 2ma low - current scales. for each maximum current scale, there are 16 current level settings separated from one another by appromimately 1db (see table 2). by default, maximum current scale is set to 20ma and dimming control current level is set to maximum (level 16). th rough sdi, certain channels or all four channels can be selected, and dimming control level for these channels can be set to maximum (level 16), minimum (level1), up from minimum to maximum or down from maximum to minimum (see table 1). dimming control c urrent levels i out (20ma) i out (30ma) i out (14ma) low - current (2ma) 16 20.0 30.0 14.0 2.0 15 17.8 26.7 12.5 1.78 14 15.9 23.8 11.1 1.59 13 14.3 21.4 10.0 1.43 12 12.7 19.0 8.9 1.27 11 11.1 16.7 7.8 1.11 10 10.2 15.2 7.1 1.02 9 8.9 13.3 6.2 0.89 8 7.9 11.9 5.6 0.79 7 7.0 10.5 4.9 0.70 6 6.3 9.5 4.4 0.63 5 5.7 8.6 4.0 0.57 4 5.1 7.6 3.5 0.51 3 4.4 6.7 3.1 0.44 2 4.1 6.2 2.9 0.41 1 0.05 0.05 0.05 0.05 table 2: dimming control current level
ap3154a 120ma high efficiency white led drive r ap3154a rev. 2 - 4 10 of 14 december 2014 www.diodes.com ? diodes incorporated disabled current sinks unused current channels must be disabled by connecting the sinks to v out with only a small sense current flowing through the disabled channel. soft - start and soft - stop soft - start and soft - stop function are incorporated to prevent excessiv e inrush current during power - up, mode switching, power - down, transition 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 ele ctrically tied to a very low 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 featur e disables the device when the input voltage drops below uvlo threshold. thermal shutdown when the die temperature exceeds the thermal limit, the device will be disabled and enter stand - by mode. the operation will be resumed whenever the die cools of f sufficiently. switching frequency by default, ap3154a is working at 1.2mhz switching frequency. it can also work at 0.6mhz or 1.8mhz switching frequency set through sdi. user can choose the appropriate switching frequency with consideration of noise imm unity, input/output voltage ripple requirement, and capacitor selection etc. up spread spectrum control when this feature is enabled through sdi, the switching frequency periodically varies between 100% and 110% of nominal frequency. it flattens the pe ak energy on nominal frequency over a range of frequency band so that emi effect is significantly reduced. pwm dimming control the ap3154a provides flexible dimming control with either 16 - level sdi protocol control or pwm dimming control through sdi pin. when pwm dimming control is enabled, the sink current is adjusted by the duty cycle of the signal applied on sdi pin. serial digital interface sdi command timing for an sdi command to be successfully received by the ap3154a , all sdi timing specif ications should be satisfied. when no command is being sent the sdi pin should be held high. if the sdi pin goes low and stays low for a time length of between tslo(min) and tslo(max) and then goes high and stays high for between tshi(min) and tshi(max), one falling edge is registered by the ap3154a . the total number of falling edges registered before the sdi pin is held high for longer than the maximum separation time tsep(max) iden tifies the command that has been received by the ap3154a . the next series of falling edges before another separation time tsep represents the next command. in other words, the ap3154a counts the number of consecutive falling edges on the sdi pin and a different number represents a different command. each command is executed aft er it is successfully received. if at any time the sdi pin is held low for longer than the maximum chip disable time toff(max), the ap3154a is disabled and e nters the shutdown mode. all internal registers are reset to default. setting the sdi pin high ag ain will re - enable the ap3154a and bring it out of the shutdown mode. the ap3154a enters the sdi mode by default when it is first powered up. the first sdi command 63 (63 falling edges) will put the ap3154a into the pwm mode, where a high level on the sd i pin turns the leds on, a low level turns the leds off and the duty cycle determines the average led brightness. the next sdi command 63 will put the ap3154a back into the sdi mode. it should be pointed out that the pwm mode is for dimming control only an d configuration settings have to be done in the sdi mode. channel configuration example the following timing diagram is a dimming control example. in this example, the first command (command 10) selects channel 2 as the configuration target and the second command (command 2) sets the channel 2 current level to one step lower while the other channels remain unchanged. function al description (continued)
ap3154a 120ma high efficiency white led drive r ap3154a rev. 2 - 4 11 of 14 december 2014 www.diodes.com ? diodes incorporated se rial digital interface (continued) marking information (1) dfn3030 - 12 part number package identification code ap3154a dfn3030 - 12 f 9 y : year : 0 ~ 9 w : week : a ~ z : 1 ~ 26 week ; ( top view ) x : a ~ z : green y w x xx xx : f 9 : ap 3154 a z : represents 52 and 53 a ~ z : 27 ~ 52 week ;
ap3154a 120ma high efficiency white led drive r ap3154a rev. 1 12 of 14 august 2009 www.diodes.com ? diodes incorporated package information (all dimensions in mm) (1) package type: dfn3030 - 12 2.3 / 2.5 0.18/0.28 0.45typ 1.5 / 1.7 2.9 / 3.1 0.10 m c a b 0.25/0.55 r0.3 b 0.25 bottom view 2.9 / 3.1 a a 0/0.05 0.57/0.63 0.15max. c 0.25 b 2x- 2x 0.08 c 0.10 c seating plane
ap3154a 120ma high efficiency white led drive r ap3154a rev. 1 13 of 14 august 2009 www.diodes.com ? diodes incorporated note s : 7. the taping ori entation of the other package type can be found on our website at http://www.diodes.com/datasheets/ap02007.pdf taping orientation
ap3154a 120ma high efficiency white led drive r ap3154a rev. 1 14 of 14 august 2009 www.diodes.com ? diodes incorporated 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 und er the laws of any jurisdiction). diodes incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. diodes incorporated does not assume any liability arising out of the application or use of this document or any product described herein; neither does diodes incorporated convey any license under its patent or trademark rights, nor the rights of others. any cus tomer or user of this document or products described 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 incorporated website, harmless aga inst all damages. diodes incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. should customers purchase or use diodes incorporated products for any unintended or unauth orized application, customers shall indemnify and hold diodes incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated wi th such unintended or unauthorized application. 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, int ernational or foreign trademarks. life support diodes incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express written approval of the chief executive officer of diodes in corporated. 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 properly used in accordance with instructions for u se provided in the labeling can be reasonably expected to result 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 l ife support device or to affect its safety or effectiveness. customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and acknowledge and agree that they are solely res ponsible for all legal, regulatory and safety - related requirements concerning their products and any use of diodes incorporated products in such safety - critical, life support devices or systems, notwithstanding any devices - or systems - related information o r support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporated and its representatives against any damages arising out of the use of diodes incorporated products in such safety - critical, life support dev ices or systems. copyright ? 2009, diodes incorporated www.diodes.com

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