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general description the aat3156 is a low noise, constant frequency charge pump dc/dc converter that uses a tri- mode load switch (1x), fractional (1.5x), and dou- bling (2x) conversion to maximize efficiency for white led applications. the aat3156 is capable of driving six-channel leds at a total of 180ma from a 2.7v to 5.5v input. the current sinks may be operated individually or in parallel for driving high- er-current leds. a low external parts count (two 1f flying capacitors and two small 1f capacitors at v in and v out ) make this part ideally suited for small battery-powered applications. analogictech's as 2 cwire? (advanced simple serial control?) serial digital input is used to enable, disable, and set current for each led with a 16-level logarithmic scale plus four low-current settings down to 50a for optimized efficiency, with a low housekeeping current of only 50a. each output of the aat3156 is equipped with built- in protection for v out short circuit and auto disable for led failure condition. built-in soft-start circuitry prevents excessive inrush current during start-up. a low current shutdown feature disconnects the load from v in and reduces quiescent current to less than 1a. the aat3156 is available in a space-saving, ther- mally-enhanced 16-pin 4x4mm qfn package. features ?v in range: 2.7v to 5.5v ? fully programmable current with single wire ? 16-step logarithmic scale ? 15/20/30ma max current ? four low current settings down to 50a ? low i q (50a) for low current mode ? tri-mode 1x, 1.5x, and 2x charge pump for maximum efficiency and v f coverage ? drives six channels of leds ? individual main/sub-group control ? no inductors, low noise operation ? 1mhz constant switching frequency ? small application circuit ? built-in thermal protection ? built-in auto-disable for open circuit ? automatic soft-start ?i q <1a in shutdown ? thermally-enhanced qfn44-16 package applications ? color (rgb) lighting ? programmable current sinks ? white led backlighting ? white photo flash for dscs aat3156 high efficiency 1x/1.5x/2x charge pump for white led applications typical application c1 1 f c2 1 f d1 d2 d3 d4 d5 d6 c ou t 1 f c in 1 f 2.7v to 5.5v en/set vin en/set c1+ c1- c2+ c2- vout d1 d2 d3 d4 d5 d6 gnd aat3156 3156.2005.06.1.1 1 chargepump ?
pin descriptions pin configuration qfn44-16 (top view) 1 2 3 4 12 11 10 9 5 6 7 8 16 15 14 13 d6 en/set n/c vout c2+ c1+ c1- c2- gnd in gnd d1 aat3156 d2 d3 d4 d5 pin # symbol function 1 d6 current sink input #6. 2 en/set as 2 cwire serial interface control pin. 3 n/c no connection. 4 vout charge pump output to drive load circuit. requires 1f capacitor connected between this pin and ground. 5 c2+ flying capacitor 2 positive terminal. connect a 1f capacitor between c2+ and c2-. 6 c1+ flying capacitor 1 positive terminal. connect a 1f capacitor between c1+ and c1-. 7 c1- flying capacitor 1 negative terminal. 8 c2- flying capacitor 2 negative terminal. 9 gnd ground. 10 in input power supply. requires 1f capacitor connected between this pin and ground. 11 gnd ground. 12 d1 current sink input #1. 13 d2 current sink input #2. 14 d3 current sink input #3. 15 d4 current sink input #4. 16 d5 current sink input #5. ep exposed paddle (bottom); connect to gnd directly beneath package. aat3156 high efficiency 1x/1.5x/2x charge pump for white led applications 2 3156.2005.06.1.1
absolute maximum ratings 1 thermal information 3 symbol description value units p d maximum power dissipation 4 2.0 w ja maximum thermal resistance 50 c/w symbol description value units v in input voltage -0.3 to 6 v v en/set en/set to gnd voltage -0.3 to v in + 0.3 v i out 2 maximum dc output current 180 ma t j operating junction temperature range -40 to 150 c t lead maximum soldering temperature (at leads, 10 sec) 300 c aat3156 high efficiency 1x/1.5x/2x charge pump for white led applications 3156.2005.06.1.1 3 1. stresses above those listed in absolute maximum ratings may cause permanent damage to the device. functional operation at co ndi- tions other than the operating conditions specified is not implied. only one absolute maximum rating should be applied at any o ne time. 2. based on long-term current density limitation. 3. mounted on an fr4 board. 4. derate 6.25 mw/c above 25c.
electrical characteristics 1 c in = c out = c1 = c2 = 1.0f; t a = -40c to 85c, unless otherwise noted. typical values are at t a = 25c, v in = 3.5v. symbol description conditions min typ max units input power supply v in operation range 2.7 5.5 v 1x mode, 3.0 v in 5.5, active, 0.3 1 no load current 1.5x mode, 3.0 v in 5.5, active, 1 3 ma i cc operating current no load current 2x mode, 3.0 v in 5.5, active, 2.0 3.7 no load current 50a setting, 1x mode 50 a i shdn shutdown current en/set = 0 1 a i dx i sink current accuracy 2 i set = 30ma, t a = 25c 27 30 33 ma i set = 4.1ma, t a = 25c 3.69 4.1 4.51 i (d-match) current matching between any v f :d1:d4 = 3.6v 0.5 % two current sink inputs 3, 4 v th 1x to 1.5x or 1.5x to 2x transition i set = 20ma 150 mv threshold at any i sink pin charge pump section t ss soft-start time 100 s f clk clock frequency 1000 khz 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 en/set _ hi _ max maximum en/set high time 75 s t off en/set off timeout 500 s t lat en/set latch timeout 500 s i en/set en/set input leakage -1 1 a aat3156 high efficiency 1x/1.5x/2x charge pump for white led applications 4 3156.2005.06.1.1 1. the aat3156 is guaranteed to meet performance specifications over the -40c to 85c operating temperature range and is assur ed by design, characterization, and correlation with statistical process controls. 2. determined by the average of all active channels. 3. current matching is defined as the deviation of any sink current at i out = 20ma and 2ma. 4. specification applies only to the tri-mode charge pump.
typical characteristics current matching vs. temperature temperature ( c) current (ma) 19.2 19.4 19.6 19.8 20.0 20.2 -40 -20 0 20 40 60 80 channel 2 channel 1 channel 5 channel 3 channel 4 channel 6 turn-off from 1.5x mode (v in = 3.5v; 20ma load) 100 s/div en (2v/div) i in (100ma/div) v f (1v/div) turn-on to 2x mode (v in = 2.8v; 20ma load) 100 s/div en (2v/div) cp (2v/div) i in (200ma/div) v sink (500mv/div) turn-on to 1.5x mode (v in = 3.8v; 20ma load) 100 s/div en (2v/div) cp (2v/div) i in (200ma/div) v sink (500mv/div) turn-on to 1x mode (v in = 4.2v; 20ma load) 100 s/div en (2v/div) cp (2v/div) i in (200ma/div) v sink (500mv/div) efficiency vs. supply voltage supply voltage (v) efficiency (%) 50 60 70 80 90 100 2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.1ma v f = 2.9v 20ma v f = 3.4v 10.2ma v f = 3.1v aat3156 high efficiency 1x/1.5x/2x charge pump for white led applications 3156.2005.06.1.1 5
typical characteristics load characteristics (v in = 3.6v; 2x mode; 30ma load) 500ns/div v in (40mv/div) v sink (40mv/div) cp (40mv/div) load characteristics (v in = 4.3v; 1.5x mode; 30ma load) 500ns/div v in (40mv/div) v sink (40mv/div) cp (40mv/div) load characteristics (v in = 3.1v; 2x mode; 20ma load) 500ns/div v in (40mv/div) v sink (40mv/div) cp (40mv/div) load characteristics (v in = 4.0v; 1.5x mode; 20ma load) 500ns/div v in (40mv/div) v sink (40mv/div) cp (40mv/div) load characteristics (v in = 2.9v; 2x mode; 15ma load) 500ns/div v in (40mv/div) v sink (40mv/div) cp (40mv/div) load characteristics (v in = 3.8v; 1.5x mode; 15ma load) 500ns/div v in (40mv/div) v sink (40mv/div) cp (40mv/div) aat3156 high efficiency 1x/1.5x/2x charge pump for white led applications 6 3156.2005.06.1.1
typical characteristics v il vs. v in v in (v) v il (v) 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 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 -40 c 25 c 85 c v ih vs. v in v in (v) v ih (v) 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 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 -40 c 25 c 85 c input ripple vs. v in v in (v) amplitude (mv) 0 5 10 15 20 25 2.50 2.67 2.84 3.01 3.18 3.35 3.52 3.69 3.86 4.03 4.2 0 10.2ma 20ma 30ma t off vs. v in v in (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 -40 c 25 c 85 c t lat vs. v in v in (v) t lat ( s) 0 50 100 150 200 250 300 350 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 -40 c 25 c 85 c aat3156 high efficiency 1x/1.5x/2x charge pump for white led applications 3156.2005.06.1.1 7
aat3156 high efficiency 1x/1.5x/2x charge pump for white led applications 8 3156.2005.06.1.1 functional block diagram 1x, 1.5x and 2x charge pump d/a d/a d/a d/a d/a d/a vin en/set gnd d6 d5 d4 d3 d2 d1 vou t c1+ c1- c2+ c2- soft-start control 1mhz oscillator voltage reference as 2 cwire interface 6 x 16 bit rom 6 x 16 bit rom functional description the aat3156 is a tri-mode load switch (1x) and high efficiency (1.5x or 2x) charge pump device intended for white led backlight applications. to maximize power conversion efficiency, an internal sensing circuit monitors the voltage required on each constant current sink input and sets the load switch and charge pump modes based on the input battery voltage and the current sink input voltage. as the battery discharges over time, the aat3156 charge pump is enabled when any of the six cur- rent sinks near dropout. the charge pump initially starts in 1.5x mode. if the charge pump output drops enough for any current sink to become close to dropout, the charge pump will automatically tran- sition to 2x mode. the aat3156 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 0.33f to 1f ceramic charge pump output capacitor (c out ). the aat3156 constant current sinks can drive six individual leds with a maximum current of 30ma per channel. the as 2 cwire serial interface enables the aat3156 and sets the constant current sink magnitudes. as 2 cwire addressing allows the led main channels d1-d4 to be controlled independ- ently from the led sub-channels d5-d6. constant current output level settings the constant current level for the led channels is set via the as 2 cwire serial interface according to a logarithmic scale. in this manner, led brightness appears linearly when the settings in the scale are traversed. because the inputs d1 to d6 are true independent constant current sinks, the voltage observed on any single given input will be deter- mined by the difference between v out and the actual forward voltage (v f ) of the led being driven.
since the constant current levels for the aat3156 are programmable, no pwm (pulse width modulation) or additional control circuitry is needed to control led brightness. this feature greatly reduces the burden on a microcontroller or system ic to manage led or display brightness, allowing the user to "set it and forget it." with its high-speed serial interface (>1mhz data rate), the led current drive of the aat3156 can be changed successively to brighten or dim leds in smooth transitions (e.g., to fade-out) or in abrupt steps, giving the user complete programmability and real-time control of led brightness. for each max current scale, there are 16 current level settings separated from one another by approximately 1db (see current settings table). code 1 is full-scale current and code 15 is full-scale attenuated roughly 14db. code 16 is reserved as a "no current" setting. constant current programming levels (ma) 1 as 2 cwire serial interface the advanced simple serial control (as 2 cwire) sin- gle wire interface is used to set the possible combi- nations of current levels and led channel states. as 2 cwire has addressing capability for multiple data registers. with multiple data registers, the aat3156 main and sub-channels can be programmed togeth- er or independently from one another. 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 aat3156 enters into shut- down mode and draws less than 1a from the sup- ply. address 1 is the default address on the first ris- ing edge after the aat3156 has been disabled. whenever shutdown mode is entered, all registers are reset to 1. 20ma max 2 30ma max 15ma max data i out (ma) i out (ma) i out (ma) 1 20.0 30.0 15.0 2 17.8 26.7 13.3 3 15.9 23.8 11.9 4 14.3 21.4 10.7 5 12.7 19.0 9.5 6 11.1 16.7 8.3 7 10.2 15.2 7.6 8 8.9 13.3 6.7 9 7.9 11.9 6.0 10 7.0 10.5 5.2 11 6.3 9.5 4.8 12 5.7 8.6 4.3 13 5.1 7.6 3.8 14 4.4 6.7 3.3 15 4.1 6.2 3.1 16 0.0 0.0 0.0 aat3156 high efficiency 1x/1.5x/2x charge pump for white led applications 3156.2005.06.1.1 9 1. there is an additional low current mode with currents down to 50a. see the low current register settings section. 2. the device defaults to the 20ma max scale. use the max current register to change the max scale.
aat3156 high efficiency 1x/1.5x/2x charge pump for white led applications 10 3156.2005.06.1.1 as 2 cwire serial interface timing address data 1 en/set 2 17 18 address data reg 1 data reg 2 1 2 . . . n <= 16 12 1 1 n t hi t lo t lat t lat as 2 cwire addressing five addresses are available to enable all of the part's functionality. two 4-bit registers control the main and sub-channels, giving 16 settings for each. the main and sub-channels are programmed to the same constant current level by using address 1. use addresses 2 and 3 to program the main and sub-channels independently. use address 4 to pro- gram the max current register, which sets the max current scale. lastly, address 5 programs the low current register. the low current register controls the efficient low current mode. when the max current register is programmed to 1, 2, or 3, chang- ing the data for addresses 1-3 will result in the cor- responding values found in the constant current programming levels table. when the max current register is programmed to 4, the part is programmed to operate in low current mode and the data for addresses 1-3 is irrelevant. in low current mode, the low current register takes precedence. see the low current register settings table below for the current level settings and main/sub-configurations that result. max current and low current registers use the max current and low current registers to program constant current settings outside of the 20ma max scale. by default (without changing the max current register), the aat3156 operates in the 20ma max scale (see constant current program- ming levels). for example, to change to the 30ma max scale, address the max current register with 20 rising edges and pause for t lat . program the max current register with 2 rising edges and pause for t lat . the part will next operate in the same data row, but for the setting found in the 30ma max col- umn. next, to change to a different setting on the 30ma max scale, address the d1-d6 register with 17 rising edges. program the new constant current level with 1-16 rising edges. the part will update to the new data setting according to the constant current programming levels table. the aat3156 has a distinct low current mode with ultra-low quiescent current. for drive currents of 2ma or less, the part operates with significantly reduced quiescent current. this is particularly use- ful for applications requiring an "always on" condi- tion such as transmissive displays. as an example, to change to low current mode, address the max current register with 20 rising edges and pause for t lat . program the max current register with 4 ris- ing edges and pause for t lat . address the low current register with 21 rising edges and pause for t lat . program the low current register with 1-16 rising edges. the part will update to the new low current mode setting and operate with significant- ly reduced quiescent current. en/set addressed address edges register 1 17 1&2: d1-d6 current 2 18 1: d1-d4 current 3 19 2: d5-d6 current 4 20 3: max current 5 21 4: low current
aat3156 high efficiency 1x/1.5x/2x charge pump for white led applications 3156.2005.06.1.1 11 max current register settings?address 4 low current register settings?address 5 disabled current sinks current sink inputs that are not used should be dis- abled. to disable and properly terminate unused current sink inputs, they must be tied to v out . if left unconnected or terminated to ground, the part will be forced to operate in 2x charge pump mode. properly terminating unused current sink inputs is important to prevent the charge pump modes from prematurely activating. when properly terminated, only a small sense current flows for each disabled channel. the sense current for each disabled chan- nel is less than 120a. the aat3156 is also equipped with an "auto-disable" feature to protect against an led failure condition. thermal protection the aat3156 has a built-in thermal protection cir- cuit that will shut down the charge pump if the die temperature rises above the thermal limit, as is the case during a short circuit of the v out pin. applications information led selection the aat3156 is specifically intended for driving white leds. however, the device design will allow the aat3156 to drive most types of leds with for- ward voltage specifications ranging from 2.0v to 4.3v. led applications may include main and sub- lcd display backlighting, camera photo-flash appli- cations, color (rgb) leds, infrared (ir) diodes for remotes, and other loads benefiting from a con- trolled output current generated from a varying input voltage. since the d1 to d6 constant current sinks are matched with negligible voltage dependence, the led brightness will be matched regardless of the specific led forward voltage (v f ) levels. in some instances (e.g., in high-luminous-output applications such as photo-flash), it may be neces- sary to drive high-v f type leds. the low-dropout current sinks in the aat3156 make it capable of driving leds with forward voltages as high as 4.3v at full current from an input supply as low as 3.0v. current sinks can be paralleled to drive high-cur- rent leds without complication. device switching noise performance the aat3156 operates at a fixed frequency of approximately 1mhz to control noise and limit har- monics that can interfere with the rf operation of cellular telephone handsets or other communica- tion devices. back-injected noise appearing on the input pin of the charge pump is 20mv peak-to- peak, typically ten times less than inductor-based dc/dc boost converter white led backlight solu- tions. the aat3156 soft-start feature prevents noise transient effects associated with in-rush cur- rents during start up of the charge pump circuit. data d1-d4 (ma) d5-d6 (ma) 10 0 20 0 30 0 40 0 5 0 0.05 6 0 0.5 70 1 80 2 9 0.05 0 10 0.5 0 11 1 0 12 2 0 13 0.05 0.05 14 0.5 0.5 15 1 1 16 2 2 data max current 1 20ma max scale 2 30ma max scale 3 15ma max scale 4 low current mode 1 1. low current mode requires the max current register to be set to low current mode. low current mode is unaffected by the sett ings for addresses 1-3.
aat3156 high efficiency 1x/1.5x/2x charge pump for white led applications 12 3156.2005.06.1.1 power efficiency and device evaluation the charge pump efficiency discussion in the fol- lowing sections only account for the efficiency of the charge pump section itself. due to the unique circuit architecture and design of the aat3156, it is very difficult to measure efficiency in terms of a percent value comparing input power over output power. since the aat3156 outputs are pure constant cur- rent sinks and typically drive individual loads, it is dif- ficult to measure the output voltage for a given out- put (d1 to d4) to derive an overall output power measurement. for any given application, white led forward voltage levels can differ, yet the output drive current will be maintained as a constant. this makes quantifying output power a difficult task when taken in the context of comparing to other white led driver circuit topologies. a better way to quantify total device efficiency is to observe the total input power to the device for a given led current drive level. the best white led driver for a given applica- tion should be based on trade-offs of size, external component count, reliability, operating range and total energy usage...not just "% efficiency." the aat3156 efficiency may be quantified under very specific conditions and is dependent upon the input voltage versus the output voltage seen across the loads applied to outputs d1 through d4 for a given constant current setting. depending on the combination of v in and voltages sensed at the cur- rent sinks, the device will operate in "load switch" mode. when any one of the voltages sensed at the current sinks nears dropout, the device will operate in 1.5x or 2x charge pump mode. each of these modes will yield different efficiency values. one should refer to the following two sections for expla- nations for each operational mode. load switch mode efficiency the aat3156 load switch mode is operational at all times and functions alone to enhance device power conversion efficiency when v in is greater than the voltage across the load. when in "load switch" mode, the voltage conversion efficiency is defined as output power divided by input power: the expression to define the ideal efficiency ( ) can be rewritten as: -or- charge pump section efficiency the aat3156 contains a fractional charge pump that will boost the input supply voltage in the event where v in is less than the voltage required on the constant current source outputs. the efficiency ( ) can be simply defined as a linear voltage regulator with an effective output voltage that is equal to one and a half or two times the input voltage. efficiency ( ) for an ideal 1.5x charge pump can typically be expressed as the output power divided by the input power. in addition, with an ideal 1.5x charge pump, the output current may be expressed as 2/3 of the input current. the expression to define the ideal efficiency ( ) can be rewritten as: -or- (%) = 100 v out 1.5v in ?? ?? = p out = v out i out = v out p in v in 1.5i out 1.5v in = p ou t p in (%) = 100 v out v in ?? ?? = p out = v out i out = v out p in v in i out v in = p ou t p in
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 ? . a capac- itor value of 1f for all four capacitors is a good starting point when choosing capacitors. if the con- stant current sinks are only programmed for light current levels, then the capacitor size may be decreased. capacitor characteristics ceramic composition capacitors are highly recom- mended over all other types of capacitors for use with the aat3156. 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 to 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 which 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 ceramic capacitors less than 0.1f 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, typ- ically greater than 2.2f, are often available in low- cost y5v and z5u dielectrics, but capacitors greater than 1f are typically not required for aat3156 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 capacitor. these larger devices can improve circuit transient response when compared to an equal value capacitor in a smaller package size. aat3156 high efficiency 1x/1.5x/2x charge pump for white led applications 3156.2005.06.1.1 13
aat3156 high efficiency 1x/1.5x/2x charge pump for white led applications 14 3156.2005.06.1.1 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 analogictech?s 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. ordering information package information all dimensions in millimeters. 4.000 0.050 pin 1 dot by marking 2.400 0.050 0.600 0.050 4.000 0.050 2.280 ref 0.650 bsc 0.900 0.050 pin 1 identification r0.030max 1 4 5 8 9 13 16 0.450 0.050 0.0125 0.0125 0.203 0.025 0.330 0.050 top view bottom view side view package marking 1 part number (tape and reel) 2 qfn44-16 nmxyy AAT3156ISN-T1 1. xyy = assembly and date code. 2. sample stock is generally held on part numbers listed in bold .

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