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aat3128 rgb led fashion lighting controller typical application g r b c in 1f r set 38.3k c out 1f c1 1f c1 1f v battery en/set in cp c1+ c1- c2+ c2- dr dg db en/set gnd aat3128 rgb led 1 isrc2 isrc1 g r b rgb led 2 rset 3128.2007.09.1.0 1 chargepump ? general description the aat3128 is a total solution controller for rgb led fashion lighting. a simplified control scheme greatly reduces design complexity and accelerates time to market. the aat3128 contains a high efficiency tri-mode charge pump dc/dc converter with 1x, 1.5x and 2x modes for color led applications. current source outputs drive two individual rgb leds for color displays, fashion and mood lighting. with a single-wire s 2 cwire interface, an rgb led module is easily controlled to display four distinct lighting mood effects. low external parts count (two 1f flying capacitors and two small bypass capacitors) and high conver- sion efficiency make the aat3128 ideally suited for small battery-powered portable applications. the aat3128 has a thermal management system to protect the device in the event of an output short circuit condition. built-in soft-start circuitry prevents excessive inrush current during start-up. a low cur- rent shutdown feature disconnects the load from the input source and reduces quiescent current to less than 1a. the aat3128 is available in a 14-pin tsopjw package. features ? 2.7v to 5.5v input voltage range ? compatible with common anode rgb leds ? four s 2 cwire controlled lighting moods ? 0~60ma programmable current source ? low noise constant frequency operation ? no inductors ? small application circuit ? regulated output current ? integrated led control switches ? automatic soft-start ? less than 1a shutdown current applications ? color backlighting for monochrome lcd displays ? color display lighting ? fashion lighting rgb leds ? mobile handsets ? mp3 players ? pdas ? smart phones
pin descriptions pin configuration tsopjw-14 (top view) 1 2 3 4 5 6 14 13 12 11 10 9 rset dg dr db gnd in en/se t isrc2 isrc1 cp c1+ c1- 7 8 c2- c2+ pin # symbol function 1 rset current setting resistor. connect a resistor from rset to gnd to program the maximum led current 2 dg green led on/off switch. dg turns on/off the green led. connect the green led cathode to dg. 3 dr red led on/off switch. dr turns on/off the red led. connect the red led cathode to dr. 4 db blue led on/off switch. db turns on/off the blue led. connect the blue led cathode to db. 5 gnd ground 6 in power input. connect the input power voltage source to in. connect a 1f ceramic capacitor from in to gnd. 7 c2- flying capacitor 2 negative node. connect a 1f ceramic capacitor between c2+ and c2-. 8 c2+ flying capacitor 2 positive node. connect a 1f ceramic capacitor between c2+ and c2-. 9 c1- flying capacitor 1 negative node. connect a 1f ceramic capacitor between c1+ and c1-. 10 c1+ flying capacitor 1 positive node. connect a 1f ceramic capacitor between c1+ and c1-. 11 cp charge pump output. cp is the output voltage stage of the internal charge pump. bypass cp to gnd with a 1f ceramic capacitor. 12 isrc1 led current source 1. isrc1 controls the current through the leds connected to it. connect the rgb led anode or led array anodes to isrc1. 13 isrc2 led current source 2. isrc2 controls the current through the leds connected to it. connect the rgb led anode or led array anodes to isrc2. 14 en/set enable/set input. enset turns on/off the aat3128 and is the s 2 cwire serial interface input to control the led color and brightness mood function. this node uses active high logic. aat3128 rgb led fashion lighting controller 2 3128.2007.09.1.0
absolute maximum ratings 1 thermal characteristics symbol description value units ja maximum thermal resistance 2 160 c/w p d maximum power dissipation 2 625 mw symbol description value units v in , v cp in, cp to gnd -0.3 to 6 v v c1+ , v c1- , c1+, c1-, c2+, c2- to gnd -0.3 to v cp + 0.3 v v c2+ , v c2- v en/set , v rset , v isrc1 , v isrc2 , en/set, rset, isrc1, isrc2, dg, dr, db to gnd -0.3 to v in + 0.3 v v dg , v dr , v db t j operating junction temperature range -40 to 150 c t lead maximum soldering temperature (at leads, 10 sec) 300 c aat3128 rgb led fashion lighting controller 3128.2007.09.1.0 3 1. stresses above those listed in absolute maximum ratings may cause permanent damage to the device. functional operation at c ondi- tions other than the operating conditions specified is not implied. only one absolute maximum rating should be applied at any one time. 2. mounted on a fr4 board.
aat3128 rgb led fashion lighting controller 4 3128.2007.09.1.0 1. the aat3128 is guaranteed to meet performance specification over the C40 to +85 c operating temperature range, and are assured by design, characterization and correlation with statistical process controls. electrical characteristics v in = 3.6v, c in = c out = c1 = c2 = 1.0f; t a = -40 to +85?c. unless otherwise noted, typical values are t a = 25?c symbol description conditions min typ max units input power supply v in input operation range 2.7 5.5 v i cc operating current 3.0 v in 5.5, c p = 1.5x, 37ma no load current i shdn shutdown current en = 0 10 a i src output current accuracy 3.0 v in 5.5 -5 5 % efficiency v in = 3.5 93 % charge pump t ss soft-start time 200 s f clk clock frequency 1 mhz efficiency v in = 3.5 93 % switches r ds(on) switch on resistance v in = 3.5, t a = 25c 2 en/set v en(l) enable threshold low 0.4 v v en(h) enable threshold high 1.4 v t en/set lo en/set low time v en/set < 0.6v 0.3 75 s t en/set hi minimum en/set high time v en/set > 1.4v 50 ns t off en/set off timeout v en/set < 0.6v 500 s t lat en/set latch timeout v en/set > 1.4v 500 s i en/set en/set input leakage v en/set = 5v -1 1 a
typical characteristics en/set turn-off time vs. input voltage input voltage (v) t off (s) 0 50 100 150 200 250 300 350 400 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5 -40c 25c 85c s 2 cwire latch enable time vs. input voltage input voltage (v) t lat (s) 0 50 100 150 200 250 300 350 400 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5 -40c 25c 85c enable input high threshold vs. input voltage input voltage (v) v ih (v) 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 2.7 3.0 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4 -40c 25c 85c enable input low threshold vs. input voltage input voltage (v) v il (v) 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 2.7 3.0 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4 -40c 25c 85c current source output vs. input voltage input voltage (v) isrc1 current (ma) 20 30 40 50 60 70 80 90 2.5 2.8 3.1 3.4 3.7 4.0 4.3 4.6 4.9 5.2 5.5 -40c 25c 85c shutdown current vs. input voltage input voltage (v) shutdown current (a) 0.0 1.0 2.0 3.0 4.0 5.0 6.0 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5 85c 25c -40c aat3128 rgb led fashion lighting controller 3128.2007.09.1.0 5
typical characteristics input vs. output transient (v in = 4.2v; data 1) time (500s/div) v in (200mv/div) v isrc1 (2v/div) i in (200ma/div) input vs. output transient (v in = 4.2v; data 5) time (500s/div) v in (200mv/div) v isrc1 (2v/div) i in (200ma/div) input vs. output transient (v in = 3.6v; data 1) time (500s/div) v in (200mv/div) v isrc1 (2v/div) i in (200ma/div) input vs. output transient (v in = 3.6v; data 5) time (500s/div) v in (200mv/div) v isrc1 (2v/div) i in (200ma/div) input vs. output transient (v in = 2.7v; data 1) time (500s/div) v in (200mv/div) v isrc1 (2v/div) i in (200ma/div) input vs. output transient (v in = 2.7v; data 5) time (500s/div) v in (200mv/div) v isrc1 (2v/div) i in (200ma/div) aat3128 rgb led fashion lighting controller 6 3128.2007.09.1.0
functional description the aat3128 is specifically designed to drive rgb color leds. this device is externally programmed via the simple single wire serial s 2 cwire interface to set one of 16 color lighting modes based on four distinct preset color light mood schemes. in addi- tion to the four color lighting moods, there are two brightness levels and two lightning sequence change speeds that may be selected. the aat3128 utilizes a tri mode load switch (1x) and high efficiency (1.5x or 2x) charge pump boost converter intended for rgb color led lighting appli- cations. to maximize power conversion efficiency, an internal sensing circuit monitors the voltage required for the constant current source outputs and sets the load switch or charge pump modes based on the input battery voltage. as the battery dis- charges over time, the aat3128 charge pump is enabled when the current source outputs near dropout. the charge pump initially starts in 1.5x mode. if the charge pump output droops enough for the current source output to become close to dropout, the charge pump will automatically transi- tion to 2x mode. this load switch to charge pump control system provides the maximum power con- version efficiency for any given operating condition. the aat3128 requires only four external compo- nents: two 1f ceramic capacitors for the charge pump flying capacitors (c1 and c2), one 1f ceramic input capacitor (c in ) and one 1f ceramic output capacitor (c p ). rgb led lighting set-up and control the aat3128 has four preset rgb led color light- ing moods which may be selected via the en/set function. these four lighting color moods are out- lined in table 1. each lighting color mood mode aat3128 rgb led fashion lighting controller 3128.2007.09.1.0 7 functional block diagram voltage reference soft start 1mhz oscillator 1x 1.5x 2x charge pump s 2 cwire interface control current level program and led switch / mood gnd en/set rset in c1+ c1- c2+ c2- cp isrc2 dr dg db isrc1
selects a preset group of 64 unique colors that the system controller repeatedly sequences through at a selected fast or slow rate. rgb led brightness and color change timing may be varied by a choice of two levels for both. the brightness control permits the full current to power the rgb led based on the current set level pro- grammed by the r set resistor. the second dim- ming level is fixed at 6db below that programmed by the r set resistor. the pace of the color change for a given mood light option can be set to a fast or slow rate. through the s 2 cwire interface, mood options allow the user to select between four different moods, each with two brightness levels and two speeds, based on the number of rising edges of the en/set pin. 16 unique moods are selected based on the settings in table 2. en/set serial interface the lighting mood output is controlled by the en/set pin, using analogictechs simple serial control? (s 2 cwire) interface. the interface records rising edges of the en/set pin, and decodes them into 16 individual settings based on an internal pre- set rom table. the interface counter can be clocked at speeds up to 1mhz. the rising edges of en/set input enable the ic and are counted for 1 to 16 edges based on the desired mode. once the final clock cycle is input for the desired mode the en/set pin is held high to enable the device output. the device is disabled 500s after the en/set pin transitions to a logic low state. the en/set timing is designed to accommodate a wide range of data rates. after the first rising edge of en/set, the charge pump is enabled and reaches full capacity after the soft-start time (t ss ). during the soft start time, multiple clock pulses may be entered on the en/set pin to set the final output current level with a single burst of clocks. a constant current is sourced and the programmed color mood is enabled as long as en/set remains in a logic high state. the current source outputs are switched off after en/set has remained in a low state for at least the t off time- out period. after the t off time out time, all internal registers are reset and the charge pump is disabled. it is advisable to issue a 500s low pulse to reset the data registers before send new sets of data to change lighting modes. this will avoid any possi- bility of losing synchronization between the aat3128 and the system mcu. aat3128 rgb led fashion lighting controller 8 3128.2007.09.1.0 table 1: programmable rgb led color lighting moods. table 2: aat3128 s 2 cwire programming modes. data bright/dim fast/slow mood 1b fm1 2b fm2 3b fm3 4b fm4 5b sm1 6b sm2 7b sm3 8b sm4 9d fm1 10 d f m2 11 d f m3 12 d f m4 13 d s m1 14 d s m2 15 d s m3 16 d s m4 mood name color description full color wheel control m1 rainbow 1 with continuous smooth transitions m2 electric beat pulsing blue C white C red color tones full color wheel control m3 rainbow 2 with varied timing for transitions m4 firelight red-orange-yellow flickering light
application information r set selection the maximum output current for current sources isrc1 and isrc2 is programmed by the r set resistor. a nominal value of 38.3k will set each current source output to 60ma each. lower maxi- mum current levels may be programmed by reduc- ing the value of r set . refer to table 3 for r set resistor values to set the maximum brightness con- stant current rounded off to the closest 1% value. table 3: r set programming values. if a desired current source output level is not listed in table 3, the r set resistor value may be calculat- ed using the following formula: where: v ref = 1.2v i out = desired output current for isrc1 and isrc2 (isrc1 = isrc2 60ma) rgb led selection the aat3128 is specifically intended for driving rgb color leds. however, the device design will allow the aat3128 to drive most types of leds with forward voltage specifications ranging from 1.0v to 5.0v. the two current sink outputs provide up to 60ma each and may be paralleled to drive high- current leds up to 120ma without complication. most rgb color leds have greatly varied forward voltage specifications for each red, green and blue led for a given forward current operating condition. refer to figure 2 or the datasheet for a given rgb led to be used with the aat3128. since the isrc1 and isrc2 output current sources are matched with negligible voltage dependence, rgb led bright- ness and color will be matched regardless of specif- ic led forward voltage (v f ) variations. figure 2: typical rgb led forward voltage vs. forward current characteristics. forward voltage (v f ) (v) forward current (i f ) (a) 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 1.00 1.50 2.00 2.50 3.00 3.50 4.0 0 r set = (1920 v ref ) i out current source output (ma) r set value (k ) 60 38.3 50 46.6 40 57.6 30 76.8 20 115 10 232 aat3128 rgb led fashion lighting controller 3128.2007.09.1.0 9 en/set timing figure 1: s 2 cwire timing diagram. en/set code 1 2 3 off off t hi t lo t off
capacitor selection careful selection of the four external capacitors c in , c1, c2, and c out is important because they will affect turn-on time, output ripple, and transient per- formance. optimum performance will be obtained when low equivalent series resistance (esr) ceramic capacitors are used. in general, low esr may be defined as less than 50m . for best over- all performance, 1f capacitors are recommended. depending on ripple requirements, the input and output capacitor values can be increased or decreased accordingly. if lower ripple is desired, increase the capacitor value. the peak-to-peak rip- ple seen at the input or output increases or decreases with capacitor size. capacitor characteristics ceramic composition capacitors are highly recom- mended over all other types of capacitors for use with the aat3128. ceramic capacitors offer many advantages over their tantalum and aluminum elec- trolytic counterparts. a ceramic capacitor typically has very low esr, is lowest cost, has a smaller pcb footprint, and is non-polarized. low esr ceramic capacitors help maximize charge pump transient response. since ceramic capacitors are non-polarized, they are not prone to incorrect con- nection damage. equivalent series resistance esr is an important characteristic to consider when selecting a capacitor. esr is a resistance internal to a capacitor that is caused by the leads, internal connections, size or area, material compo- sition, and ambient temperature. capacitor esr is typically measured in milliohms for ceramic capac- itors and can range to more than several ohms for tantalum or aluminum electrolytic capacitors. ceramic capacitor materials capacitors used in aat3128 applications range in value from 0.47f to 2.2f. nominally a 1f capacitor with a minimum voltage specification exceeding 6v is recommended. ceramic capaci- tors in this range are typically composed of x7r, x5r, z5u, or y5v dielectric materials. the use of x5r and x7r dielectric capacitors is strongly rec- ommended due to their inherent low esr charac- teristics and improved tolerance specifications over the device operating temperature range. capacitors that are physically larger will have a lower esr when compared to a smaller case size capacitor made from an equivalent material. these larger devices can improve circuit transient response when compared to an equal value capac- itor in a smaller package size. layout considerations the aat3128 is a high-performance device that operates with a high switching frequency. to ensure optimal device performance and accommo- date the fast switched capacitor transients generat- ed by the aat3128, special attention should be given to the printed circuit board (pcb) layout. the pcb traces connecting c1 and c2 experience fast current transients. as a result, the trace lengths for c1 and c2 should be minimized by placing the components as closely as possible to the ic. this will minimize path resistance and reduce ringing due to the inductance associated with trace length. for best ic performance, c in and c out are placed as closely as possible to the in and cp pins and are connected to a solid ground. aat3128 rgb led fashion lighting controller 10 3128.2007.09.1.0
aat3128 rgb led fashion lighting controller 3128.2007.09.1.0 11 aat3128 evaluation board layout figure 3: aat3128 evaluation board figure 4: aat3128 evaluation board component side pcb layout. solder side pcb layout.
ordering information package information tsopjw-14 all dimensions in millimeters. 2.40 0.10 2.85 0.20 0.40 bsc 0.055 0.045 0.15 0.05 7 nom 0.04 ref 0.45 0.1 5 2.75 0.25 4 4 1.00 + 0.10 - 0.065 3.05 + 0.05 - 0.10 0.9625 0.0375 top view side view end view all analogictech products are offered in pb-free packaging. the term pb-free means semiconductor products that are in compliance with current rohs standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. for more information, please visit our website at http://www.analogictech.com/pbfree. package marking 1 part number (tape and reel) 2 tsopjw-14 vmxyy AAT3128ITO-T1 aat3128 rgb led fashion lighting controller 12 3128.2007.09.1.0 1. xyy = assembly and date code. 2. sample stock is generally held on part numbers listed in bold .
aat3128 rgb led fashion lighting controller 3128.2007.09.1.0 13 advanced analogic technologies, inc. 3230 scott boulevard, santa clara, ca 95054 phone (408) 737-4600 fax (408) 737-4611 ? advanced analogic technologies, inc. analogictech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an analogictech pr oduct. no circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. analogictech reserves the right to make changes to their products or specifications or to discontinue any product or service with- out notice. except as provided in analogictechs terms and conditions of sale, analogictech assumes no liability whatsoever, an d analogictech disclaims any express or implied war- ranty relating to the sale and/or use of analogictech products including liability or warranties relating to fitness for a part icular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. in order to minimize risks associated with the customers applications, adequa te design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. testing and other quality control techniques are utilized to the extent an alogictech deems necessary to support this warranty. specific testing of all parameters of each device is not necessarily performed. analogictech and the analogictech logo are trad emarks of advanced analogic technologies incorporated. all other brand and product names appearing in this document are registered trademarks or trademarks of their respective holder s.

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