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aat3129 high efficiency 1x/1.5x/2x charge pump for rgb color led applications 3129.2007.01.1.4 1 chargepump ? general description the aat3129 is a high efficiency charge pump dc/dc converter with tri-mode load switch (1x) fractional (1.5x) and doubling (2x) conversion for color led applications. a single current source out- put provides a regulated current to drive r, g, and b leds via three internal switches. with a simple single wire serial bus, the rgb module can be eas- ily controlled to display 4096 colors. analogictech's advanced simple serial control? (as 2 cwire?) serial digital input is used to enable, disable, and set the duty cycle of each internal mosfet switch. low external parts count (two 1 f flying capacitors and two small bypass capac- itors at v in and out) makes the aat3129 ideally suited for small battery-powered applications. the aat3129 has a thermal management system to protect the device in the event of a short-circuit condition on any of the output pins. built-in soft- start circuitry prevents excessive inrush current during start-up. high switching frequency enables the use of small external capacitors. a low current shutdown feature disconnects the load from v in and reduces quiescent current to less than 1 a. the aat3129 is available in a pb-free, 12-pin tsopjw package. features ?v in range: 2.7v to 5.5v ? common anode rgb led control ? 4096 color with single wire digital control ? 40ma to 180ma fixed current source ?as 2 cwire digital brightness control ? low noise constant frequency operation ? small application circuit ? regulated output current ? no inductors ? 1mhz switching frequency ?i q <1 a in shutdown ? 12-pin tsopjw package applications ? fashion rgbs ? mobile handsets ? mp3 players ? pdas ? portable devices ? rgb color leds ? rgb photo flash ? smart phones typical application c in 1 f v bat c cp 1 f c1 1 f c2 1 f vin cp c1+ c1- c2+ c2- dr dg db en/set en/set gnd aat3129 g r b isrc
pin descriptions pin configuration tsopjw-12 (top view) pin # symbol function 1 c2+ flying capacitor 2 positive terminal. connect a 1 f capacitor between c2+ and c2-. 2 cp charge pump output. requires 1 f capacitor connected between this pin and ground. 3 c1- flying capacitor 1 negative terminal. 4 c1+ flying capacitor 1 positive terminal. connect a 1 f capacitor between c1+ and c1-. 5 isrc current source output. 6 en/set as 2 cwire control pin. 7 db open drain switch blue diode cathode. 8 dg open drain switch green diode cathode. 9 dr open drain switch red diode cathode. 10 gnd ground. 11 in input power supply. requires 1 f capacitor connected between this pin and ground. 12 c2- flying capacitor 2 negative terminal. aat3129 high efficiency 1x/1.5x/2x charge pump for rgb color led applications 2 3129.2007.01.1.4 1 2 3 4 5 6 12 11 10 9 8 7 c2+ cp c1- c1+ isrc en/set c2- in gnd dr dg db
absolute maximum ratings 1 thermal information symbol description value units p d maximum power dissipation 2, 3 625 mw ja thermal resistance 160 c/w symbol description value units v in input voltage -0.3 to 6 v v cp charge pump output -0.3 to 6 v v en/set en/set to gnd voltage -0.3 to 6 v v en/set(max) maximum en/set to input voltage 0.3 v t j operating junction temperature range -40 to 150 c t lead maximum soldering temperature (at leads, 10 sec) 300 c aat3129 high efficiency 1x/1.5x/2x charge pump for rgb color led applications 3129.2007.01.1.4 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 an fr4 board. 3. derate 6.25mw/c above 25c.
electrical characteristics 1 v in = 3.5v, c in = c cp = c1 = c2 = 1 f; t a = -40c to +85c. unless otherwise noted, typical values are t a = 25c. symbol description conditions min typ max units input power supply v in operation range 2.7 5.5 v i cc operating current 3.0 v in 5.5, cp = 1.5x, 1 3 ma no load current i shdn shutdown current en = 0 1 a i src output current accuracy 3.0 v in 5.5 -5 5 % charge pump t s start-up delay time 200 s f clk clock frequency 1 mhz efficiency v in = 3.5v 93 % switches r ds(on) switch on resistance v in = 3.5v, t a = 25c 1.5 en/set v en(l) enable threshold low v in = 2.7v 0.4 v v en(h) enable threshold high v in = 5.5v 1.4 v t en/set lo en/set low time 0.3 75 s t en/set hi min minimum en/set high time 50 ns t off en/set off timeout 500 s t lat en/set latch timeout 500 s i en/set en/set input leakage v en/set = 5.5v, v in = 5.5v -1 1 a aat3129 high efficiency 1x/1.5x/2x charge pump for rgb color led applications 4 3129.2007.01.1.4 1. the aat3129 is guaranteed to meet performance specifications over the -40c to +85c operating temperature range and is assu red by design, characterization, and correlation with statistical process controls.
typical characteristics aat3129 high efficiency 1x/1.5x/2x charge pump for rgb color led applications 3129.2007.01.1.4 5 turn-off from 1.5x mode (v in = 3.6v; addr = 2; data = 16) 100 s/div en/set (2v/div) i isrc (50ma/div) v isrc (2v/div) turn-on to 2x mode (v in = 2.8v; isrc = 60ma) 100 s/div en/set (2v/div) cp (2v/div) i isrc (50ma/div) turn-on to 1.5x mode (v in = 3.6v; isrc = 60ma) 100 s/div en/set (2v/div) cp (2v/div) i isrc (50ma/div) turn-on to 1x mode (v in = 4.2v; isrc = 60ma) 100 s/div en/set (2v/div) cp (2v/div) i isrc (50ma/div)
typical characteristics aat3129 high efficiency 1x/1.5x/2x charge pump for rgb color led applications 6 3129.2007.01.1.4 line response (1x, 1.5x mode; i isrc = 60ma) 1ms/div v in (1v/div) v cp (1v/div) i isrc (50ma/div) v isrc (1v/div) 3.5v 3.9v line response (1x mode; i isrc = 60ma) 1ms/div v in (1v/div) v cp (1v/div) i isrc (50ma/div) v isrc (1v/div) 3.7v 4.2v operating characteristics (v in = 3.6v; dr in 1x mode; dg and db in 1.5x mode) 100 s/div cp (1v/div) i isrc (50ma/div) v isrc (1v/div) 5.3v 3.5v operating characteristics (v in = 3.9v; dr and dg in 1x mode; db in 1.5x mode) 100 s/div cp (1v/div) i isrc (50ma/div) v isrc (1v/div) 5.2v 3.8v operating characteristics (v in = 4.2v; dr, db, and dg in 1x mode) 100 s/div cp (1v/div) i isrc (50ma/div) v isrc (1v/div) 4.1v
typical characteristics aat3129 high efficiency 1x/1.5x/2x charge pump for rgb color led applications 3129.2007.01.1.4 7 t off vs. v in input voltage (v) t off ( s) 50 100 150 200 250 300 350 2.7 3.0 3.3 3.5 3.8 4.1 4.4 4.7 4.9 5.2 5.5 -40 c +25 c +85 c t lat vs. v in input voltage (v) t lat ( s) 0 50 100 150 200 250 300 350 400 450 2.7 3.0 3.3 3.5 3.8 4.1 4.4 4.7 4.9 5.2 5.5 -40 c +25 c +85 c i isrc vs. v f (v in = 3.5v) v f (v) i isrc (ma) 54 55 56 57 58 59 60 61 62 63 64 1.0 1.5 2.0 2.5 3.0 3.5 4.0 +25 c +85 c -40 c i isrc vs. v in (v f = 3.5v) v in (v) i isrc (ma) 54 55 56 57 58 59 60 61 62 63 64 2.7 3.0 3.3 3.5 3.8 4.1 4.4 4.7 4.9 5.2 5.5 +25 c +85 c -40 c shutdown current vs. temperature temperature ( c) shutdown current ( 0.001 0.01 0.1 1 -40 -20 0 20 40 60 80 100 oscillator frequency vs. temperature temperature ( c) f osc (mhz) 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 -40 -20 0 20 40 60 80 100
typical characteristics aat3129 high efficiency 1x/1.5x/2x charge pump for rgb color led applications 8 3129.2007.01.1.4 v il vs. v in input voltage (v) v il (mv) 550 600 650 700 750 800 850 900 950 1000 1050 2.7 3.0 3.3 3.5 3.8 4.1 4.4 4.7 4.9 5.2 5.5 -40 c +25 c +85 c v ih vs. v in input voltage (v) v ih (mv) 550 600 650 700 750 800 850 900 950 1000 1050 2.7 3.0 3.3 3.5 3.8 4.1 4.4 4.7 4.9 5.2 5.5 -40 c +25 c +85 c switch resistance vs. supply voltage supply voltage (v) switch resistance ( ) 0.2 0.4 0.6 0.8 1.0 1.2 1.4 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 +85 c +25 c -40 c
aat3129 high efficiency 1x/1.5x/2x charge pump for rgb color led applications 3129.2007.01.1.4 9 functional block diagram functional description the aat3129 is a tri-mode load switch (1x) and high efficiency (1.5x or 2x) charge pump device intended for fashion color led lighting applications. to maximize power conversion efficiency, an inter- nal sensing circuit monitors the voltage required on the constant current source output and sets the load switch and charge pump modes based on the input battery voltage and the current source output voltage. as the battery discharges over time, the aat3129 charge pump is enabled when the current source output nears dropout. the charge pump ini- tially starts in 1.5x mode. if the charge pump out- put drops enough for the current source output to become close to dropout, the charge pump will automatically transition to 2x mode. the aat3129 requires only four external compo- nents: two 1 f ceramic capacitors for the charge pump flying capacitors (c1 and c2), one 1 f ceramic input capacitor (c in ), and one 0.33 f to 1 f ceramic output capacitor (c p ). the color and brightness of an rgb color led is maintained by pwm signals, which are pro- grammed via the as 2 cwire interface. the control block generates three gate drive pwm signals for the n-channel mosfet switches. please refer to the interface description and timing in the following section for details. voltage reference soft start 1mhz oscillator 1x 1.5x 2x charge pump as 2 cwire interface control c1- c2+ c2- cp isrc dr dg db gnd en/set vin c1+
applications information as 2 cwire serial interface the advanced simple serial control digital interface is used to set the color, overall intensity, and method of update for the r, g, and b channels. the intensi- ty for each channel is set by dedicated 4-bit registers giving each channel 16 levels of brightness and resulting in 4096 possible color combinations. in addition to the three color registers, there is an inten- sity register and a mode register. the intensity reg- ister sets the overall intensity and provides 16 glob- al brightness levels. the mode register toggles the method of update between two possibilities. depending on the mode register setting, the aat3129 will update the r, g, and b channels immediately or update them only when the intensity register is updated. as 2 cwire relies on the number of rising edges of the en/set pin to address and load the registers. as 2 cwire latches data or address after the en/set pin has been held high for time t lat . address or data is differentiated by the number of en/set rising edges. since the data registers are 4 bits each, the differentiating number of pulses is 2 4 or 16, so that address 1 is signified by 17 rising edges, address 2 by 18 rising edges, and so forth. data is set to any number of rising edges between 1 and including 16. a typical write protocol is a burst of en/set rising edges, signifying a particular address, followed by a pause with en/set held high for the t lat timeout period, a burst of rising edges signifying data, and a t lat timeout for the data registers. once an address is set, then multiple writes to the corresponding data register are allowed. when en/set is held low for an amount of time greater than t off , the aat3129 enters into shut- down mode and draws less than 1 a from the sup- ply. address 1 is the default address on the first ris- ing edge after the aat3129 has been disabled. when shutdown mode is entered, the address and data registers are reset to 1. as 2 cwire serial interface timing as 2 cwire serial interface addressing address en/set rising edges data register description 1 17 r red 2 18 g green 3 19 b blue 4 20 t intensity 5 21 m mode aat3129 high efficiency 1x/1.5x/2x charge pump for rgb color led applications 10 3129.2007.01.1.4 address data 1 en/set 2 17 18 address g r, b, t, m 1 2 . . . n <= 16 1 2 1 1 n t hi t lo t lat t lat
aat3129 high efficiency 1x/1.5x/2x charge pump for rgb color led applications 3129.2007.01.1.4 11 color registers r, g, and b the individual color brightness is set using the three r, g, and b registers. the data register con- tents determine the on-time for each color channel during a pwm cycle. the first level is 0, or off, and is set with a single en/set rising edge. this setting eliminates a given color from the spectrum. the remaining 15 levels progressively increase the brightness for a particular color by increasing that channel?s on-time. using the red channel as an example, the resulting on-time is on-time = (r - 1) 128 s where r is the data setting (from 1 to 16). the same applies to g and b. intensity register t the overall intensity level is set by the t register. once a particular mixing of colors is set to produce the desired color, the overall intensity can be adjusted while keeping constant the ratio of colors to one another. the brightest level is set by pro- gramming the t register with 1 edge. programming the t register with 16 edges produces the dimmest setting. the t register adjusts the overall intensity by controlling the pwm off-time. under the dimmest setting, the off-time is the longest. the off- time that results from the data in the t register is off-time = (t - 1) 512 s diode current timing mode register m the mode register determines the method of update for the r, g, and b channels. when the mode register is set to 1, the addressed color updates immediately. when the mode register is set to 2, the colors will update when the t register is written (synchronized updating). under immediate updating, an addressed channel will update as soon as new data has latched for it. under synchronized updating, the channels that have been assigned new data will not update until data for the t register latches. by using synchronized updating, discrete changes in color can be achieved. synchronized updating allows the intensity for all three colors to be updat- ed simultaneously. all three color registers can be loaded with new data prior to the update. then, upon loading the t register, all three colors will change to their new states together. this allows a user to transition from one mixed color to another without having to traverse intermediate colors. under immediate updating color changes can only be achieved serially, or one color at a time. (r - 1) 128 s (t - 1) 512 s 128 s (g - 1) 128 s 128 s (b - 1) 128 s 128 s i src i src red green blue i src i src
aat3129 high efficiency 1x/1.5x/2x charge pump for rgb color led applications 12 3129.2007.01.1.4 mode register settings - address 5 led current the resulting dc current for each of the r, g, and b channels depends on the overall system settings. using the overall settings, the current for a particular channel is calculated as m setting action 1 r, g, b, t registers latched independently 2 r, g, b registers synchronized to t register latch where i src is the factory programmed current and chls_on is the number of channels programmed to operate. whenever a channel is programmed to data = 1, that channel is programmed to off and must be removed from the chls_on count. 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 performance. 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 100m . for best overall performance, 1 f capacitors are recom- mended. 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 aat3129. ceramic capacitors offer many advantages over their tantalum and aluminum electrolytic counterparts. a ceramic capacitor typi- cally has very low esr, is lowest cost, has a small- er 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. b - 1 4 (t - 1) + (r - 1) + (g - 1) + (b - 1) + chls_on i b = i src g - 1 4 (t - 1) + (r - 1) + (g - 1) + (b - 1) + chls_on i g = i src r - 1 4 (t - 1) + (r - 1) + (g - 1) + (b - 1) + chls_on i r = i src
aat3129 high efficiency 1x/1.5x/2x charge pump for rgb color led applications 3129.2007.01.1.4 13 ceramic capacitor materials ceramic capacitors less than 0.1 f are typically made from npo or c0g materials. npo and c0g materials typically have tight tolerance and are sta- ble over temperature. larger capacitor values are typically composed of x7r, x5r, z5u, or y5v dielectric materials. large ceramic capacitors, typi- cally greater than 2.2 f, are often available in low- cost y5v and z5u dielectrics, but capacitors greater than 1 f are typically not required for aat3129 applications. capacitor area is another contributor to esr. capacitors that are physically large will have a lower esr when compared to a smaller capacitor made from an equivalent material. these larger devices can improve circuit transient response when compared to an equal value capacitor in a smaller package size. layout considerations the aat3129 is a high-performance device that operates with a high switching frequency. to ensure optimal device performance and accommodate the fast transients generated by the aat3129 special attention should be given to the board layout. the recommended layout is illustrated in figure 1. the 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. figure 1: optimal pcb layout. gnd gnd c1 c2 cin cout
aat3129 high efficiency 1x/1.5x/2x charge pump for rgb color led applications 14 3129.2007.01.1.4 ordering information package information all dimensions in millimeters. output current package marking 1 part number (tape and reel) 2 60ma tsopjw-12 nnxyy AAT3129ITP-60-T1 1. xyy = assembly and date code. 2. sample stock is held on part numbers listed in bold . 0.20 + 0.10 - 0.05 0.055 0.045 0.45 0.15 7 nom 4 4 3.00 0.10 2.40 0.10 2.85 0.20 0.50 bsc 0.50 bsc 0.50 bsc 0.50 bsc 0.50 bsc 0.15 0.05 0.9625 0.0375 1.00 + 0.10 - 0.065 0.04 ref 0.010 2.75 0.25 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.
advanced analogic technologies, inc. 830 e. arques avenue, sunnyvale, ca 94085 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 specifi cations or to discontinue any product or service without notice. customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information b eing relied on is current and complete. all products are sold sub- ject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. analogictech warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with anal ogictech?s standard warranty. testing and other quality con- trol techniques are utilized to the extent analogictech deems necessary to support this warranty. specific testing of all param eters of each device is not necessarily performed. analogictech and the analogictech logo are trademarks of advanced analogic technologies incorporated. all other brand and produ ct names appearing in this document are regis- tered trademarks or trademarks of their respective holders. aat3129 high efficiency 1x/1.5x/2x charge pump for rgb color led applications 3129.2007.01.1.4 15

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