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general description the aat3119 is a general purpose high efficiency voltage regulated charge pump ic that can produce output current levels up to 150ma. as a voltage regulated output device, it may be used for general voltage boost applications or to power white, rgb, or flash type leds from a 2.7v to 5.5v input. the voltage doubling charge pump architecture of the aat3119 provides for a low external part count; just three small ceramic capacitors are needed. this makes the aat3119 ideally suited for small battery-powered applications. this device oper- ates from a fixed high frequency 1.2mhz oscillator which enables the use of very small external capacitors, one 1f flying capacitor, and two 1f bypass capacitors at in and out. the aat3119 has built-in soft-start circuitry which prevents excessive inrush current from the source supply during startup. a low-current shutdown fea- ture disconnects the load from v in and reduces quiescent current to less than 1.0a when the device is disabled. the aat3119 is available in a pb-free, 8-pin sc70jw package and is rated over the -40c to +85c temperature range. features ?v in range: 2.7v to 5.5v ? 150ma of output current peak current up to 250ma ? regulated output voltage ? 1.2mhz switching frequency ? low noise constant frequency operation ? <1.0a of shutdown current ? automatic soft start ? small application circuit ? inductorless boost ? 8-pin sc70jw package ? -40c to +85c temperature range applications ? cellular phones ? digital cameras ? handheld electronics ? pdas ? white led backlighting ? white led camera flash aat3119 high efficiency 2x charge pump typical application aat3119 in gnd en out c out c in 1 f 1 f 1 f c+ c- c fly enable v in v ou t 3119.2005.08.1.1 1 chargepump ?
pin descriptions pin configuration sc70jw-8 in out c+ gnd gnd gnd c- en 1 2 3 45 6 7 8 pin # symbol function 1 en enable input control pin. when low, the device is disabled and consumes less than 1a of current. this pin should not be left floating. 2 in input power supply. a 1f capacitor should be connected between this pin and ground. 3 out charge pump output. connect a 1f capacitor between this pin and ground. 4 c+ flying capacitor positive terminal. connect a 1f capacitor between c+ and c-. 5 c- flying capacitor negative terminal. 6 gnd ground connection. 7 gnd ground connection. 8 gnd ground connection. aat3119 high efficiency 2x charge pump 2 3119.2005.08.1.1
absolute maximum ratings 1 thermal information 2 symbol description value units ja thermal resistance 160 c/w p d maximum power dissipation 3 625 mw symbol description value units v in input voltage -0.3 to 6.0 v v out charge pump output -0.3 to 6.0 v v en en to gnd voltage -0.3 to 6.0 v v en(max) maximum en to input voltage 0.3 v i out maximum dc output current 250 ma t j operating junction temperature range -40 to 150 c t lead maximum soldering temperature (at leads, 10 sec) 300 c aat3119 high efficiency 2x charge pump 3119.2005.08.1.1 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 = 3.3v; c in = c out = c fly = 1.0f; t a = -40c to 85c, unless otherwise noted. typical values are t a = 25c. symbol description conditions min typ max units aat3119-5.0 power supply v in input voltage range 2.7 5.5 v v out output voltage tolerance 2.7v < v in < 5v, i out = 50ma 4% output voltage 3.0v < v in < 5v, i out = 100ma 4.8 5.0 5.2 v i cc operating current v in = 5.0v, active, no load current 2.0 4.5 ma i shdn shutdown current en = 0 1.0 a i out maximum output current 3.0 v in 5.5 150 ma efficiency v in = 3.0v, i out = 100ma 82 % en v en(l) enable threshold low 0.4 v v en(h) enable threshold high en = 5.5v 1.4 v i i enable input current -1.0 1.0 a charge pump t ss soft-start time 200 s f clk clock frequency 1200 khz aat3119-4.5 power supply v in input voltage range 2.7 5.5 v v out 2.7v < v in < 5v, i out = 50ma 4% output voltage 3.0v < v in < 5v, i out = 100ma 4.32 4.5 4.68 v i cc operating current v in = 4.5v, active, no load current 2.0 4.5 ma i shdn shutdown current en = 0 1.0 a i out maximum output current 3.0 v in 5.5 150 ma efficiency v in = 2.7v, i out = 100ma 82 % en v en(l) enable threshold low 0.4 v v en(h) enable threshold high en = 5.5v 1.4 v i i enable input current -1.0 1.0 a charge pump t ss soft-start time 200 s f clk clock frequency 1200 khz aat3119 high efficiency 2x charge pump 4 3119.2005.08.1.1 1. the aat3119 is guaranteed to meet performance specifications from 0c to 70c. specification over the -40c to +85c operati ng temperature range is assured by design, characterization, and correlation with statistical process controls.
aat3119 high efficiency 2x charge pump 3119.2005.08.1.1 5 typical characteristics _ aat3119-5v oscillator frequency vs. supply voltage supply voltage (v) oscillator frequency (mhz) 1.10 1.15 1.20 1.25 1.30 2.7 3.2 3.7 4.2 4.7 -40 c +85 c +25 c efficiency vs. load current load current (ma) efficiency (%) 0 10 20 30 40 50 60 70 80 90 100 0.1 1.0 10 100 1000 v in = 2.7v v in = 3.0v v in = 3.3v v in = 3.6v efficiency vs. supply voltage supply voltage (v) efficiency (%) 0 10 20 30 40 50 60 70 80 90 100 2.7 3.0 3.3 3.6 3.9 4.2 4. 5 50ma 100ma 150ma supply current vs. v en v en control voltage (v) supply current (ma) 0 1 2 3 4 5 01 3 4 256 i out = 0 a v in = 3.3v v in = 2.8v v in = 5.5v supply current vs. supply voltage supply voltage (v) supply current (ma) 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 2.5 3.0 3.5 4.0 4.5 5. 0 i out = 0 a c fly = 1 f v en = v in output voltage vs. output current output current (ma) output voltage (v) 4.0 4.2 4.4 4.6 4.8 5.0 5.2 5.4 0 40 80 120 160 200 v in = 2.7 v in = 3.0 v in = 3.3 v in = 3.6
aat3119 high efficiency 2x charge pump 6 3119.2005.08.1.1 typical characteristics _ aat3119-5v output ripple voltage (i out = 100ma @ v in = 3.5v) v in (10mv/div) v out (20mv/div) i in (10ma/div) time (1 s/div) output ripple voltage (i out = 50ma @ v in = 3.5v) v in (10mv/div) v out (10mv/div) i in (10ma/div) time (1 s/div) load response (100ma load) v out (10mv/div) i out (50ma/div) time (5ms/div) v in = 3.5v load response (50ma load) v out (10mv/div) i out (20ma/div) time (5ms/div) v in = 3.5v start-up time with 100ma load time (100 s/div) v out (1v/div) enable (1v/div) start-up time with 50ma load time (100 s/div) v out (1v/div) enable (1v/div)
typical characteristics _ aat3119-4.5v oscillator frequency vs. supply voltage supply voltage (v) oscillator frequency (mhz) -40 c +85 c +25 c 1.10 1.15 1.20 1.25 1.30 2.7 3.0 3.3 3.6 3.9 4.2 4.5 efficiency vs. load current load current (ma) efficiency (%) 0 10 20 30 40 50 60 70 80 90 100 0.1 1.0 10 100 1000 v in = 2.7v v in = 3.0v v in = 3.3v v in = 3.6v efficiency vs. supply voltage supply voltage (v) efficiency (%) 0 10 20 30 40 50 60 70 80 90 100 2.7 3.0 3.3 3.6 3.9 4.2 4.5 50ma 100ma 150ma supply current vs. v en v en control voltage (v) supply current (ma) 0 1 2 3 4 5 01 2 3 4 5 6 i out = 0 a v in = 5.5 v in = 3.3v v in = 2.8v supply current vs. supply voltage supply voltage (v) supply current (ma) 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 2.5 3.0 3.5 4.0 4.5 5.0 i out = 0 a c fly = 1 f v en = v in output voltage vs. output current output current (ma) output voltage (v) 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4 4.6 4.8 5.0 0 40 80 120 160 200 v in =3.3 v in =3.6 v in = 2.7 v in = 3.0 aat3119 high efficiency 2x charge pump 3119.2005.08.1.1 7
aat3119 high efficiency 2x charge pump 8 3119.2005.08.1.1 typical characteristics _ aat3119-4.5v startup time (100 s/div) v out (1v/div) enable (1v/div) i load = 100ma @ v in = 3.0v i load = 150ma @ v in = 3.3v i load = 150ma @ v in = 3.3v maximum current pulse vs. supply voltage supply voltage (v) maximum current pulse (ma) 0 100 200 300 400 500 600 3.0 3.2 3.4 3.6 3.8 4.0 4.2 one-shot pulse duration = 250ms v out > 4.0v output ripple voltage (i out = 100ma @ v in = 3.5v) v in (10mv/div) v out (20mv/div) i in (10ma/div) time (1 s/div) output ripple voltage (i out = 50ma @ v in = 3.5v) v in (10mv/div) v out (10mv/div) i in (10ma/div) time (1 s/div) load response (100ma load) v out (10mv/div) i out (50ma/div) time (5ms/div) v in = 3.5v load response (50ma load) v out (10mv/div) i out (20ma/div) time (5ms/div) v in = 3.5v
typical characteristics _ aat3119 normalized output voltage vs. temperature temperature ( c) normalized output voltage (%) -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 -50 -30 -10 10 30 50 70 90 i out = 25ma v en threshold vs. supply voltage supply voltage (v) v en threshold (v) 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 v il v ih v in vs. v il supply voltage (v) v il (v) +85 c 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 +25 c -40 c v in vs. v ih supply voltage (v) v ih (v) 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 -40 c +25 c +85 c aat3119 high efficiency 2x charge pump 3119.2005.08.1.1 9
aat3119 high efficiency 2x charge pump 10 3119.2005.08.1.1 functional block diagram out voltage reference soft start 1mhz oscillator charge pump c1+ c1- gnd en in functional description the aat3119 is a 5.0v or 4.5v regulated voltage doubling charge pump device intended for general applications that require low noise voltage boost function from input supplies ranging from 2.7v to 5.5v. the charge pump is capable maintaining the regulated voltage output for continuous output cur- rent loads up to 150ma. this makes the aat3119 ideal for general purpose voltage boost applica- tions, driving white and rgb color leds, as well as usb otg v bus supplies in portable products. the aat3119 charge pump and regulation circuit is also capable of supplying peak pulse currents up to 250ma for 500ms. this makes the device suitable for many photo-flash led applications. the aat3119 accomplishes the voltage boost func- tion by utilizing a voltage doubling (2x) charge pump. the charge pump block within the device uses low r ds mosfet switches to transfer charge from the input to output via a flying capacitor (c fly ). this switching process is performed over two phas- es of each clock cycle which is set by the fixed 1.2mhz internal oscillator. on the first phase of each clock cycle, the flying capacitor is placed in parallel with the input (in) and is charged to the level of the input voltage across c in . on the second phase of the switching cycle, the flying capacitor is reconfigured by the internal switches and placed in series with the input capacitor. c in and c fly are then placed across the output capacitor (c out ). the voltage seen on c out is then two times that of c in . the aat3119 contains an internal reference and feedback system that senses the charge pump output and controls the charge pump function to maintain an accurate regulated output voltage. because of the fixed 1.2mhz high frequency inter- nal oscillator, the input, output, and flying capaci- tors are very small. this circuit architecture requires only one 1f ceramic capacitor for the charge pump flying capacitor (c fly ) and one 1f ceramic capacitor for both c in and c out . the aat3119 has a soft-start circuit to prohibit in- rush current when the device is enabled. this fea- ture guarantees a smooth transition to the desired output voltage when the device is turned on. the system soft-start circuit is particularly useful in white led backlight applications where the use of a pwm signal is employed as an led dimming function. in limiting the input inrush current each time the device is turned on, the soft-start circuit helps minimize back-injected switching noise and transient supply current.
aat3119 high efficiency 2x charge pump 3119.2005.08.1.1 11 in the operating state, the aat3119 typically con- sumes 2ma of quiescent operating current. the enable pin (en) is an active high input. when pulled low, the aat3119 is shut down, the quies- cent current drops to less than 1a, and the output is disconnected from the input. charge pump efficiency the core of the aat3119 is a regulated output volt- age doubling charge pump. the efficiency ( ) for an ideal voltage doubling charge pump can typical- ly be expressed as the output power divided by the input power: in addition, with an ideal voltage doubling charge pump, the output current may be expressed as half the input current. the expression to define the ideal efficiency ( ) can be rewritten as: -or- for a charge pump with an output of 5.0 volts and a nominal input of 3.0 volts, the theoretical efficien- cy is 83.3%. due to internal switching losses and ic quiescent current consumption, the actual effi- ciency can be measured at approximately 82%. efficiency will decrease as the level of v in approaches that of the regulated v out . refer to the device typical characteristics curves for expect- ed actual efficiency based on either input voltage or load current. capacitor selection careful selection of the three external capacitors (c in , c fly , and c out ) is important because they will affect turn-on time, output ripple, efficiency, and load transient response. 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 ? . a value of 1f for all three capacitors is a good starting point when designing with the aat3119. this not only provides for a very small printed circuit board area, but cost is further reduced by the minimized bill of materials. input capacitor a 1f multilayer ceramic chip capacitor is suggest- ed for the input. this capacitor should be connect- ed between the in pin and ground. 1f should be suitable for most applications. even though the aat3119 switching ripple and noise are very low, back-injected line noise may be further reduced by increasing the value of c in . other types of capaci- tors may be used for c in at the cost of compro- mised circuit performance. output capacitor the output capacitor (c out ) should be connected between the out pin and ground. a 1f ceramic capacitor is also suggested in this position. switching noise and ripple seen on the charge pump output increases with load current. typically 1f is sufficient for minimizing output ripple seen by the load circuit. if the load current in an appli- cation is low, or if higher levels of switching ripple can be tolerated, c out can be reduced as low as 0.33f. if application circuits with greater load cur- rent demands require lower switching ripple ampli- tudes, c out may be increased to values above 1f. capacitor types other than ceramic capaci- tors can be used for c out . however, capacitors comprised of materials other than ceramic will typ- ically have a greater value of esr, resulting in increased output switching ripple. (%) = 100 v out 2v in ?? ?? = p out = v out i out = v out p in v in 2i out 2v in = p ou t p in
aat3119 high efficiency 2x charge pump 12 3119.2005.08.1.1 flying capacitor due to the switching operation of the voltage dou- bling circuit topology, current flow through the flying capacitor is bi-directional. the flying capacitor selected must be a non-polarized type. a 1f low esr ceramic capacitor is ideal for this application. capacitor characteristics ceramic composition capacitors are highly recom- mended over all other types of capacitors for use with the aat3119. ceramic capacitors offer many advan- tages over their tantalum and aluminum electrolytic 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 connection damage. equivalent series resistance: esr is an impor- tant characteristic to consider when selecting a capacitor. esr is a resistance internal to a capaci- tor that is determined by the leads, internal con- nections, size or area, material composition, and ambient temperature. capacitor esr is typically measured in milliohms for ceramic capacitors and can range to more than several ohms for tantalum or aluminum electrolytic capacitors. ceramic capacitor materials: ceramic capacitors less than 0.1f are typically made from npo or c0g materials. npo and c0g materials typically have tight tolerance and are stable over tempera- ture. large capacitor values are typically com- posed of x7r, x5r, z5u, or y5v dielectric materi- als. large ceramic capacitors, typically greater than 2.2f, are often available in low-cost y5v and z5u dielectrics, but large capacitors are not required in most aat3119 applications. capacitor area is another contributor to esr. capacitors that are physically large will have a lower esr when compared to an equivalent material smaller capac- itor. these larger devices can improve circuit tran- sient response when compared to an equal value capacitor in a smaller package size. applications information white led backlight driver led selection: in applications where the aat3119 is utilized as a white led backlight driver, leds with forward voltages up to 5.0v may be used. the aat3119 is available in two regulated output volt- age versions: 4.5v and 5.0v. the output voltage option selected will determine the maximum led forward voltage that can be driven. the trade-off for the lower 4.5v output voltage version is the devices ability to supply greater output current. refer to the "output voltage vs. output current" curves in the typical characteristics section of this datasheet to determine the best aat3119 output voltage option based on the requirements of a given application. led ballast resistors: to set the maximum brightness of white leds connected in parallel from a voltage source supply, a ballast resistor connect- ed between each led cathode and ground is required. refer to the application schematic in figure 1. the maximum brightness is determined by the forward current (i f ) through the respective led for a given forward voltage (v f ). the typical forward voltage of a specific led is usually stated in the typical characteristics of the given led manu- facturer's datasheet. the correct ballast resistor value can be determined by the following equation: where: r b = ballast resistor value in ohms ( ? ) v out = regulated charge pump output voltage v f = led forward voltage at the desired forward current i f = desired led forward current r b = (v out - v f ) i f
flash led driver the aat3119 can source 250ma for pulsed loads up to 500ms from an input supply as low as 3.3v. this makes the device well suited for low-cost flash led driver applications in portable products. typically the 4.5v output version of the aat3119 should be selected for photo-flash led applica- tions, as it can maintain better voltage regulation at higher pulsed load current levels (refer to figure 2). the limitation of this option is that the greatest flash led forward voltage (v f ) that can be driven is 4.5v at the maximum set forward current (i f ) for the application. flash leds with forward voltage (v f ) levels up to 5.0v can be driven by the aat3119 5.0v output option. however, the maximum cur- rent for a 500ms pulse will be reduced. refer to the typical characteristics curves for peak output current levels for a given minimum input voltage. the forward current (i f ) through the flash led may be determined with the use of a series ballast resis- tor. the typical forward voltage (v f ) for the flash led in a given application should be derived from the led manufacturer's datasheet for the desired forward current (i f ) of the flash application. once the forward current has been determined, the flash ballast resistor can be calculated using the follow- ing equation: where: r f = flash ballast resistor value in ohms ( ? ) v out = regulated charge pump output voltage (typically 4.5v) v f = flash led forward voltage at the desired forward current i f = desired flash led forward current the flash led function can be controlled by the aat3119 enable pin in most applications. the device start-up time into a maximum load is about 200s, thus eliminating the need for pre-flash con- trol synchronization. r f = (v out - v f ) i f aat3119 high efficiency 2x charge pump 3119.2005.08.1.1 13 figure 1: white led driver. aat3119 in gnd en out c out c in 1 f 1 f 1 f c1+ c1- d1 d2 d3 d4 d5 d6 c fly r b2 r b3 r b4 r b5 r b1 r b6 v battery enable
aat3119 high efficiency 2x charge pump 14 3119.2005.08.1.1 if a "light" or "movie" mode is also needed along with the flash function, this can be accomplished with the addition of a second ballast resistor with a flash function gating mosfet switch as shown in figure 3. refer to the following equations for the calculation of flash and light resistors, r f and r l . where: r l = light mode ballast resistor value in ohms ( ? ) v out = regulated charge pump output voltage (typically 4.5v) v f = flash led forward voltage at the desired forward current i f = desired flash led forward current in the "light" mode where: r f = flash ballast resistor value in ohms ( ? ) r ds = flash gating mosfet on resistance v out = regulated charge pump output voltage (typically 4.5v) v f = flash led forward voltage at the desired forward current i f = desired flash led forward current r f = - r ds (v out - v f) i f r l = (v out - v f ) i f figure 2: flash led application. aat3119 in gnd en out 4.5v c out c in r f 1 f 1 f 1 f c fly v in enable flash led
layout considerations for the aat3119, the high charge pump switching frequencies and large peak transient currents require careful printed circuit board layout. as a general rule for charge pump boost converters, the three external capacitors should be located as closely as possible to the device package with min- imum length trace connections. maximize ground plane around the aat3119 charge pump and make sure all external capacitor are connected to the immediate power ground plane. a local component side ground plane is recommended. if this is not possible due the layout area limitations, assure good ground connections by the use of large or multiple printed circuit board vias. refer to the following basic aat3119 evaluation board shown in figures xxx for an example of the recommended charge pump layout design. aat3119 high efficiency 2x charge pump 3119.2005.08.1.1 15 figure 3: flash led driver with gated flash application. aat3119 in gnd en out 4.5v c out c in r l r f 1 f 1 f 1 f c fly v in enable flash enable flash led
ordering information package information sc70jw-8 all dimensions in millimeters. 0.225 0.075 0.45 0.10 0.05 0.05 2.10 0.30 2.00 0.20 7 3 4 4 1.75 0.10 0.85 0.15 0.15 0.05 1.10 max 0.100 2.20 0.20 0.048ref 0.50 bsc 0.50 bsc 0.50 bsc 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 sc70jw-8 muxyy aat3119ijs-4.5-t1 sc70jw-8 mvxyy aat3119ijs-5.0-t1 aat3119 high efficiency 2x charge pump 16 3119.2005.08.1.1 advanced analogic technologies, inc. 830 e. arques avenue, sunnyvale, ca 94085 phone (408) 737-4600 fax (408) 737-4611 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 wi thout notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. all products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of l iability. analogictech warrants performance of its semiconductor products to the specifications applicable at the time of sale in accorda nce with analogictechs standard warranty. testing and other quality control techniques are utilized to the extent analogictech deems necessary to support this warranty. specific tes ting of all parameters of each device is not necessarily performed. 1. xyy = assembly and date code. 2. sample stock is held on part numbers listed in bold .

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