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smartswitch ? general description the AAT4295/97 smartswitch is a member of analogictech's application specific power mos- fet? (aspm?) product family. the AAT4295/97 is comprised of three/six low-side n-channel mos- fet switches that gate an applied load to ground. this device is intended for controlling rgb fashion lighting in portable products; it can also be used for a combination of general purposes where a load requires a low-side switch connection to ground. the AAT4295/97 simplifies design and layout limi- tations by eliminating the need for multiple gpio control lines and discrete mosfets to control product features. the state of each output channel is controlled with a single gpio line via the en/set pin using analogictech's simple serial control? (s 2 cwire?) interface. after a short set of data pulses is sent to the en/set input and the line is pulled to logic high, the device is enabled with the desired switch config- uration. in the enabled state, the AAT4295/97 typi- cally consumes less than 3a of quiescent current. when en/set is pulled to a logic low, the device is disabled and each output switch is placed in a high impedance open state. the AAT4295 and aat4297 operate over an input voltage range of 1.8v to 5.5v, making them ideal for battery-powered applications. the three-switch AAT4295 is offered in a pb-free, 8-pin sc70jw package, while the six-switch aat4297 is offered in a pb-free, 12-pin tsopjw package. both devices are rated over the -40c to +85c temperature range. features ? input voltage range: 1.8v to 5.5v ? independent low-side n-channel mosfet switches: ? AAT4295: three channels ? aat4297: six channels ? user-programmable s 2 cwire interface ? single gpio controls state of each mosfet ? low quiescent current: 3a typical ? temperature range: -40c to +85c ? no external components required ? available in pb-free packages ? AAT4295 in 8-pin sc70jw ? aat4297 in 12-pin tsopjw applications ? cell phones ? multiple low power switching ? personal communication devices ? portable electronic devices AAT4295/97 single/dual rgb controller typical application d1 rb1 d2 rb2 d3 rb3 *d4 rb4 *d5 rb5 *d6 rb6 en/set s1 s2 s3 *s4 *s5 *s6 gnd en/set v cc * aat4297 only AAT4295/97 vcc 4295.2006.03.1.3 1
pin descriptions pin configuration AAT4295 aat4297 sc70jw-8 tsopjw-12 (top view) (top view) 1 2 3 4 5 6 12 11 10 9 8 7 gnd s1 s2 s5 s4 s3 n/c en/set n/c n/c vcc s6 n/c n/c en/set s3 s2 s1 gnd vcc 1 2 3 45 6 7 8 pin number AAT4295 aat4297 symbol function 1 8 vcc input supply voltage. 2, 3 9, 10, 12 n/c no connection. 4 11 en/set input control pin using s 2 cwire serial interface. the device records rising edges of the clock and decodes them into eight states, which control the on/off states of the mosfets. see table 1 for output settings. in addition, a logic low forces the device into shutdown mode, reducing the supply current to less than 1a. this pin should not be left floating. 5 1 gnd ground connection. 6 2 s1 drain of the n-channel mosfet for channel 1. 7 3 s2 drain of the n-channel mosfet for channel 2. 8 6 s3 drain of the n-channel mosfet for channel 3. n/a 4 s5 drain of the n-channel mosfet for channel 5. n/a 5 s4 drain of the n-channel mosfet for channel 4. n/a 7 s6 drain of the n-channel mosfet for channel 6. AAT4295/97 single/dual rgb controller 2 4295.2006.03.1.3
absolute maximum ratings 1 thermal information 2 symbol description value units ja thermal resistance sc70jw 225 c/w tsopjw 160 p d maximum power dissipation sc70jw 440 3 mw tsopjw 625 4 symbol description value units v cc to gnd power supply to gnd 6.0 v inx to gnd all input (drain) to gnd -0.3 to 6.0 v en/set en/set to gnd -0.3 to 6.0 v t j operating junction temperature range -40 to 150 c AAT4295/97 single/dual rgb controller 4295.2006.03.1.3 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. derated 4.4mw/c above 25c. 4. derated 6.25mw/c above 25c.
electrical characteristics 1 v cc = 5.0v; t a = -40c to +85c, unless otherwise noted. typical values are t a = 25c. symbol description conditions min typ max units v cc supply voltage range 1.8 5.5 v i q quiescent current v cc = 5v, en/set = v cc , i out = 3.0 10 a no load, all switches on i q(off) off supply current en/set = 0, v cc = 5v, v out open 1.0 a i ds(off) off switch current for any en/set = 0, v cc = 5v, v out = 0 0.1 1.0 a switch r ds(on) on-resistance v cc = 5v 1.9 6.0 ? v cc = 3.6v 2.1 7.0 t crds on-resistance temperature 2800 ppm/c coefficient t on output turn-on time 2 v in = 5v, r pullup = 250 ? , c out = 0.1f 0.6 2.7 s en/set v en(l) enable threshold low v in = 1.8v 0.3 v v en(h) enable threshold high v in = 5.5v 1.4 v t en/set lo en/set low time 0.5 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 AAT4295/97 single/dual rgb controller 4 4295.2006.03.1.3 1. the AAT4295 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. 2. t on is the time after latch timeout to 10% of the output voltage. see figure 1, timing diagram.
typical characteristics r ds(on) vs. temperature (v in = 5v; i load = 20ma) temperature ( c) r ds(on) ( ? ) 1.0 1.5 2.0 2.5 3.0 -40 -20 0 20 40 60 80 100 r ds6 r ds3 r ds4 r ds5 r ds2 r ds1 r ds(on) vs. temperature (v in = 3.6v; i load = 20ma) temperature ( c) r ds(on) ( ? ) 1.0 1.5 2.0 2.5 3.0 -40 -20 0 20 40 60 80 100 r ds6 r ds3 r ds4 r ds5 r ds2 r ds1 r ds(on) vs. input voltage (i load = 20ma) input voltage (v) r ds(on) ( ? ? ) 1.0 1.5 2.0 2.5 3.0 3.5 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 r ds1 r ds5 r ds2 r ds3 r ds4 r ds6 off-supply current vs. temperature temperature ( c) quiescent current (a) 0.000 0.001 0.002 0.003 0.004 0.005 0.006 -40 -20 0 20 40 60 80 100 v in = 5v v in = 4.2v v in = 3.3v v in = 1.8v quiescent current vs. temperature temperature ( c) quiescent current (a) 1.0 1.5 2.0 2.5 3.0 -40 -20 0 20 40 60 80 100 v in = 5v v in = 3.6v quiescent current vs. input voltage input voltage (v) quiescent current ( a) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 1.5 2 2.5 3 3.5 4 4.5 5 5. 5 85 c 25 c -40 c AAT4295/97 single/dual rgb controller 4295.2006.03.1.3 5 4295.2006.03.1.3 5
typical characteristics turn-off characteristic (i out1 = i out2 = 20ma) time (50s/div) en/set (5v/div) v out1 (5v/div) v out2 (5v/div) i out1 (20ma/div) turn-on characteristic (i out1 = i out2 = 20ma) time (50s/div) en/set (5v/div) v out1 (5v/div) v out2 (5v/div) i out1 (20ma/div) turn-on characteristic (i out1 = i out2 = 20ma) time (50s/div) en/set (5v/div) v out1 (5v/div) v out2 (5v/div) i out1 (20ma/div) en/set off timeout vs. input voltage input voltage (v) off timeout, t off (s) 50 100 150 200 250 300 1.5 2 2.5 3 3.5 4 4.5 5 5.5 -40 c 25 c 85 c en/set latch timeout vs. input voltage input voltage (v) latch timeout, t lat (s) 50 100 150 200 250 300 1.5 2 2.5 3 3.5 4 4.5 5 5. 5 -40 c 25 c 85 c en/set timeout vs. input voltage input voltage (v) timeout (s) 50 75 100 125 150 175 200 225 250 1.5 2 2.5 3 3.5 4 4.5 5 5.5 t off t latch AAT4295/97 single/dual rgb controller 6 4295.2006.03.1.3
typical characteristics v il vs. input voltage input voltage (v) v il (v) 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 85 c 25 c -40 c v ih vs. input voltage input voltage (v) v ih (v) 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 85 c 25 c -40 c turn-on fall time vs. temperature temperature ( c) time (s) 0.0 0.2 0.4 0.6 0.8 1.0 -40 -20 0 20 40 60 80 10 0 t on (fall time) time (50s/div) en/set (5v/div) v out2 (5v/div) i out1 (20ma/div) v out1 (20mv/div, a c coupled) turn-off transient characteristic (i out1 = i out2 = 20ma) time (50s/div) en/set (5v/div) v out2 (5v/div) i out1 (20ma/div) v out1 (20mv/div, a c coupled) turn-on transient characteristic (i out1 = i out2 = 20ma) transition of outputs (i out1 = i out2 = 20ma) time (50s/div) en/set (5v/div) v out1 (5v/div) v out2 (5v/div) i out1 (20ma/div) AAT4295/97 single/dual rgb controller 4295.2006.03.1.3 7
AAT4295/97 single/dual rgb controller 8 4295.2006.03.1.3 functional block diagram control logic s 2 cwire interface en/set vcc gnd s6* s5* s4* s3 s2 s1 * aat4297 only functional description the AAT4295/97 is comprised of three or six low- side n-channel mosfet load switches primarily targeted for general purpose applications where several load circuits need to be connected to a com- mon ground and controlled from a single microcon- troller gpio output. when a given switch is enabled, the respective switch connects the load input (s1 to s3 for the AAT4295 and s1 to s6 for the aat4297) to ground through the n-channel mos- fet. each low-side n-channel mosfet transistor has a typical on resistance (r ds(on) ) of 2 ? when operating from a 3.6v supply. both the AAT4295 and aat4297 have been designed to operate with an input voltage range of 1.8v to 5.5v, making them ideal for battery-powered applications. these devices may be used for load switching applications such as rgb led fashion lighting, display or keypad backlight leds, miscellaneous indicator led lamps, as well as audio and rf cir- cuits or any other system with a power requirement that does not exceed the thermal dissipation limits of the load switch and device package. each switch input may be represented by the fol- lowing circuit (figure 1) and simplified equivalent model (figure 2).
4295.2006.03.1.3 9 the state of each switch is controlled via the en/set pin using analogictech's s 2 cwire inter- face. to enable a respective switch, a series of clocked pulses should be applied to the en/set pin. the number of pulses clocked will determine the switch configuration based on the truth table given in table 1. at the end of the serial pulse data set, the en/set set pin should be held high to latch the clocked data and enable the desired switch configuration. when the device is enabled with the en/set held to a logic high state, the quiescent current consumption will typically increase to 3a at normal ambient room temperatures. if output sequencing of the switches is not necessary, all of the switches may be turned on simultaneously on the first rising edge of the en/set pin by simply pulling the en/set to a logic high level. the default configuration for one clock pulse is to enable all switches to the "on" state. however, if output sequencing is desired, a series of pulses on the en/set pin will set the outputs to the desired state (refer to table 2 for output settings). for led lighting applications, the en/set line may be clocked at rates up to 1mhz, allowing the user to not only control brightness, but (in the case of color rgb leds) color as well. output settings the on/off state of the mosfet switches is controlled by the en/set serial data input. an internal control counter is clocked on the rising edge of the en/set pin, and is decoded into the 8 possible states of the mosfet for the AAT4295 (see table 1) and 64 possible states for the aat4297 (see table 2). the counter rolls over after 8 clocks and the table repeats. table 1: AAT4295 en/set settings. clock out3 out2 out1 1ononon 2ononoff 3onoffon 4 on off off 5 off on on 6 off on off 7 off off on 8 off off off AAT4295/97 single/dual rgb controller 4295.2006.03.1.3 9 figure 1: switch input circuit. figure 2: simplified equivalent model. 2 ? control s1 to s6 control s1 to s6
AAT4295/97 single/dual rgb controller 10 4295.2006.03.1.3 the s 2 cwire interface relies on the number of ris- ing edges of the en/set pin to load the internal register to a desired count. s 2 cwire control latches data after the en/set pin has been held high for the preset latch enable time (t lat ). the interface records rising edges of the en/set pin and decodes them into one of 8 states for the AAT4295 or to one of 64 states for the aat4297, as indicat- ed in tables 1 and 2. the counter can be clocked at speeds up to 1mhz, so different switch combi- nations may be clocked in lighting applications without any visible perception to the user. alternatively, the en/set clock pulses may be entered one at a time for the desired setting. the first rising edge of en/set enables the ic and turns all the switches on. once the final clock cycle is received, the en/set pin is held high to maintain the device setting. the device is disabled 500s (t off ) after the en/set pin transitions to a logic low state (see figure 3). table 2: output settings. aat4297 aat4297 AAT4295 (only) clock out6 out5 out4 out3 out2 out1 clock out6 out5 out4 out3 out2 out1 1 on on on on on on 33 off on on on on on 2 on on on on on off 34 off on on on on off 3 on on on on off on 35 off on on on off on 4 on on on on off off 36 off on on on off off 5 on on on off on on 37 off on on off on on 6 on on on off on off 38 off on on off on off 7 on on on off off on 39 off on on off off on 8 on on on off off off 40 off on on off off off 9 on on off on on on 41 off on off on on on 10 on on off on on off 42 off on off on on off 11 on on off on off on 43 off on off on off on 12 on on off on off off 44 off on off on off off 13 on on off off on on 45 off on off off on on 14 on on off off on off 46 off on off off on off 15 on on off off off on 47 off on off off off on 16 on on off off off off 48 off on off off off off 17 on off on on on on 49 off off on on on on 18 on off on on on off 50 off off on on on off 19 on off on on off on 51 off off on on off on 20 on off on on off off 52 off off on on off off 21 on off on off on on 53 off off on off on on 22 on off on off on off 54 off off on off on off 23 on off on off off on 55 off off on off off on 24 on off on off off off 56 off off on off off off 25 on off off on on on 57 off off off on on on 26 on off off on on off 58 off off off on on off 27 on off off on off on 59 off off off on off on 28 on off off on off off 60 off off off on off off 29 on off off off on on 61 off off off off on on 30 on off off off on off 62 off off off off on off 31 on off off off off on 63 off off off off off on 32 on off off off off off 64 off off off off off off
application information external component selection the AAT4295 and aat4297 have been designed so that no external parts are required for the device to function as a general purpose three- or six-posi- tion low-side switch. for some applications, the addition of bypass capacitors or pull-up or pull- down resistors may be desired to improve overall system performance. for lighting applications, such as controlling rgb leds, keypad or display backlight leds, or photo flash leds, no bypass capacitors are necessary. for other general purpose load switching applica- tions which may use some or all of the outputs to switch light load current levels to application cir- cuits, good engineering practice would dictate the use of small bypass capacitors placed on the v cc input and each switch connection that is used to conduct current from the load to ground. the use of small ceramic capacitors between the input and output nodes will aid in reducing line and load tran- sient response effects when the load switch on a given output is turned on or off. input capacitor typically, a 0.1f capacitor is recommended for c in in most applications to provide input line tran- sient response immunity to small changes in the input supply. a c in capacitor is not required for basic operation. if used, c in should be located as close to the device v in pin as practically possible. there is no specific capacitor equivalent series resistance (esr) requirement for c in ; however, for higher current operation, ceramic capacitors are recommended for c in due to their inherent capabil- ity over tantalum or aluminum electrolytic capaci- tors to withstand input current surges from low impedance sources, such as batteries in portable devices. output capacitor for typical applications where the AAT4295/97 is used for led lighting control, no output capacitors are required because the end load is not sensitive to device turn-on or turn-off transient effects. for improved load transient response in systems using the AAT4295/97 for load switching, the addi- tion of a small output capacitor placed between the output pins and ground can have a beneficial effect. a 0.1f ceramic capacitor is suggested as a reasonable value for an output capacitor. the output capacitor has no specific capacitor type or esr requirement. if desired, c out may be increased to a value greater than 0.1f without limit to accommodate any load transient condition without adversely affecting the device turn-on slew rate time. thermal considerations the AAT4295 and aat4297 are designed to sink a continuous load current to ground when a respec- tive switch is enabled via the s 2 cwire control. the limiting characteristic for maximum safe operating load current through a given switch or set of switch- es is package power dissipation. in order to obtain high operating currents, careful device layout and circuit operating conditions must be taken into account. at any given ambient temperature (t a ), the maximum package power dissipation can be determined by the following equation: constants for the AAT4295 are maximum junction temperature, t j(max) = 125c, and package thermal resistance, ja = 225c/w. worst case conditions are calculated at the maximum operating tempera- p d(max) = t j(max) - t a ja AAT4295/97 single/dual rgb controller 4295.2006.03.1.3 11 4295.2006.03.1.3 11 figure 3: en/set timing diagram. t h t l t lat t on t o t off sn en/set
ture, where t a = 85c. typical conditions are cal- culated under normal ambient conditions, where t a = 25c. at 25c ambient, the AAT4295 is capable of dissipating 444.4mw of power and the aat4297 is capable of dissipating 625mw of power. at 85c ambient, the AAT4295 is capable of dissipating 177.8mw of power and the aat4297 can dissipate 250mw. the power dissipation of any given mosfet switch is limited by its respective on resistance (r ds ). the r ds of any given mosfet switch is controlled by the applied gate voltage to the switch, which is set by the applied v cc supply and the ambient operating temperature. switch rds for the AAT4295 or aat4297 may be estimated by using the r ds versus temperature curve in the typical characteristics section of this datasheet. the maximum current of any given switch can be calculated for a given operating temperature and v cc supply level. the corresponding r ds is deter- mined by use of the r ds vs. temperature curve for the given v cc . given the maximum package power dissipation and operating temperature, the maximum current through any switch or combination of switches can be calculated using the following formula: example: if all the switches on an AAT4295 were closed simultaneously, each switch could handle up to 271ma of current at 25c for total of 813ma. for the same set of operating conditions at 25c, the aat4297 can handle up to 208ma per switch for a total of 1.25a for all six switches. if the load current for a desired application exceeds the rec- ommended current at a given temperature, two or more switches may be operated in parallel as long as the overall power dissipation of the device pack- age is not exceeded. if different current levels are passed through different switches on a given device, then one should total up the power dissipa- tion for each switch and assure the sum of the power dissipation does not exceed the power rat- ing for the package. application circuits today, many mobile phones and similar products contain rgb led fashion lighting, lcd display and sub-display, as well as keypad backlighting and photo flash leds. due to the nature of common anode rgb leds, the AAT4295 and aat4297 make ideal low-cost lighting control solutions. in general, most types of leds can be controlled via a low-side mosfet switch and current limiting bal- last resistor. the following application circuits (figures 4 through 7) show voltage boosting charge pumps to power rgb and flash leds. however, if a voltage or current source is already available in a given product design, the charge pump circuit block may be replaced with the existing power source solution. since both the AAT4295 and aat4297 require only one gpio line from the system micro- controller to enable and disable all the switches via the en/set input, these solutions can provide a simple way to add lighting solutions to existing design platforms. driving led loads when driving leds with a voltage source, series ballast resistors must be used to limit the led for- ward current. the led current will vary with supply voltage and led forward voltage. most types of leds have forward voltage specifications ranging from 2.0v to 5.0v. when controlling an led of any type with a low-side mosfet switch, the neces- sary series ballast resistor value can be calculated from the following formula: where: r ballast is the value of resistor to be placed in series with the led ( ? ). v in is the input supply voltage to the device (v). v f is the forward voltage of the led (v). r ds(on) is the resistance of the switch when it is turned on ( ? ). i led is the desired operating current of the led (a). r ballast = - r ds(on) (v in - v f ) i led i switch(max) = p d(max) r ds 1 2 ?? ?? AAT4295/97 single/dual rgb controller 12 4295.2006.03.1.3
figure 4: single rgb led fashion light solution using an AAT4295. figure 5: dual rgb led fashion light solution using an aat4297. r1 g1 b1 1f rgb led 10f 10f r2 g2 b2 r r1 r g1 r b1 r r2 r g2 r b2 s1 s2 s3 s4 s5 s6 gnd en/set vcc aat4297 aat3110 vin vout gnd c+ c- shdn rgb led li-ion battery 2.8v - 4.2v cp on/off en/set data r g b 1f 10f 10f r r r g r b s1 s2 s3 gnd en/set vcc AAT4295 aat3110 vin vout gnd c+ c- shdn rgb led li-ion battery 2.8v - 4.2v cp on/off en/set data AAT4295/97 single/dual rgb controller 4295.2006.03.1.3 13
figure 6: rgb led fashion light with a dual mode light/strobe flash led solution using an aat4297. figure 7: total lighting control solution using an aat4297. includes rgb fashion light, main display and sub-display lcd backlight, and photo flash led. r g b main display d1 r r r g r b r d1 s1 s2 s3 s4 s5 s6 gnd en/set vcc aat4297 rgb led en/set data input voltage supply d2 d3 d4 r d2 r d3 r d4 sub display d5 d6 r d5 r d6 flash led flash r flash r1 g1 b1 flash led 10f 10f flash r r1 r g1 r b1 r light r flash s1 s2 s3 s4 s5 s6 gnd en/set vcc aat4297 aat3112 vin vout1 gnd c2+ c2- en2 rgb led li-ion battery 2.8v - 4.2v flash enable en/set data 1f 1f c1+ c1- vout2 en1 rgb/light enable vin AAT4295/97 single/dual rgb controller 14 4295.2006.03.1.3
AAT4295/97 single/dual rgb controller 4295.2006.03.1.3 15 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 rbxyy AAT4295ijs-t1 tsopjw-12 rcxyy aat4297itp-t1 1. xyy = assembly and date code. 2. sample stock is generally held on part numbers listed in bold .
AAT4295/97 single/dual rgb controller 16 4295.2006.03.1.3 advanced analogic technologies, inc. 830 e. arques avenue, sunnyvale, ca 94085 phone (408) 737-4600 fax (408) 737-4611 tsopjw-12 all dimensions in millimeters. 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 ? 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 subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warran ty, 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.

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