da6241.00 5 31 january , 201 9 1 ( 9 ) mas 6241 piezo driver with 3x charge pump ? self - drive method ? differential output ? up to 18vpp output from 3v supply ? high efficiency ? solution without inductors ? low external part count description mas 6241 is a piezo driver device suitable for driving self - drive type piezo electric sounder or d iaphragm . it can drive outputs up to 18 vpp from 3v supply. an internal 3x charge pump generates boost ed s upply voltage for piezo driver. t he ch arge pump and piezo driv er are controlled on and off using enable (en) input pin . mas 6241 is an easy and low - cost solution for piezo driver, since only 4 small value capacitors are needed in addition to sound element - the use of inductors can be avoided. the inductorless design also causes significantly less disturbance to the surrounding cir cuits making it an ideal choice for sensitive designs. its charge pump switches at 1mh z , allowing to using as small as 100nf external flying and output capacitors. the piezo driver has two outputs (vob, vos) and one feedback input (feed) to drive 3 - termina l self - drive type piezo in bridge tied load (btl) configuration. MAS6241 is available in 3x3 x0.75 mm size qfn - 12 package. features applications ? self - drive method ? differential output ? up to 18vpp output from 3v supply ? in d u c torless low emi solution ? 1mhz switching frequency ? low external part count ? thin 3x3x0.75 mm qfn - 12 p ackage ? piezoelectric buzzer ? smoke alarm ? alarm clock ? wh ite goods ? portable device with sound feature
da6241.00 5 31 january , 201 9 2 ( 9 ) block & application diagram figure 1 . enable pin controlled differential piezo driver - max 18vpp signal for piezo from 3v supply voltage figure 2. supply voltage controlled differential piezo driver - max 18vpp signal for piezo from 3v supply voltage
da6241.00 5 31 january , 201 9 3 ( 9 ) figure 3 . enable pin controlled single - ended piezo driver - max 9 vpp signal for piezo from 3v supply voltage charge pump fly ing capacitor configurations the 3x charge pump is configured either to 3x or 2x charge pump operation depending on the flying capacitor configuration. the 2x operation requires only one flying capacitor (cf) betwee n pins cp2 and cn1. the 3x operation requires two flying capacitors (cf1, cf2) between cp1 and cn1 and cp2 and cn2 pins respectively. see figure 4 . figure 4 . 2x and 3x charge pump operation configurations piezo drive voltage depends on supply voltage (vin) and charge pump and piezo load configurations (table 1). table 1 . maximum piezo drive voltage [vpp] at different vin and charge pump and output load configurations vin 2x charge pump config. 3x charge pump config. single - ended differentia l single - ended differential 2.2 4.4 8.8 6.6 13.2 3 6 12 9 18 3.6 7.2 14.4 10.8 21.6
da6241.00 5 31 january , 201 9 4 ( 9 ) capacitor and resistor values capacitors must be ceramic type with low esr and meeting sufficient minimum voltage ratings. the cin input, cf1 and cf2 flying capacitors see one vin voltage and they have minimum 6.3v voltage rating. the cout capacitor sees 2 x vin voltage in 2x configura tion and 3 x vin voltage in 3x configuration. then the cout capacitor should have minimum 9v voltage rating in the 2x configuration and minimum 16v rating in the 3x configuration. see table 2 for recommended capacitor and resistor values. table 2 . reco mmended capacitor and resistor values capacitor nominal value voltage rating cin 10 ? f (min 1 ? f) min 6.3v cf1 , cf2 100nf min 6.3v c out 100nf min 9 v in 2x configuration min 16 v in 3x configuration c1 470p min 9 v in 2x configuration min 16 v in 3x configuration r1 1.5m r2 200k note: some capacitor dielectric materials such as y5v have strong voltage dependence. the actual capacitance value may drop remarkably when operating near rated voltage. in such case the nominal capacitor value should b e chosen larger to compensate the voltage dependence. the input (cin), flying (cf1, cf2) and output (cout) capacitor value selections have influence on output (vout) ripple and disturbances at supply voltage input (vin) . table 3 shows alternative capacitor value selections in different applications. in battery operated applications it is recommended to use cin=10 ? f which keeps the start - up inrush current low. table 3 . capacitor value selections in different applications cin cf1 - 2 cout application 1 f 100nf 100nf minimum size layout 1 0 f 100nf 100nf low input disturbances 1 0 f 100nf 1 f low input disturbances and low output ripple note: the voltage ripple at vout output is approximately proportional to ratio of piezo load capacitance (c piezo ) and charge pump output capacitor (cout) . then the output ripple can be reduced by choosing output capacitor value which is much larger relative to piezo capacitance value . however , note that large output capacitor also lengthens output voltage rise time and increases inrush current during start - up.
da6241.00 5 31 january , 201 9 5 ( 9 ) absolute maximum ratings all voltages with respect to ground. parameter symbol conditions min max unit supply voltage vin charge pump off charge pump on 5.5 4 .5 v output and flying c apacitor pin voltages vout, cp1, cp2, vos, vob - 0.3 15 v cn2 - 0.3 13 v cn1 - 0.3 vin + 0.3 v input pins voltages en - 0.3 vin + 0.3 v feed - 20 30 v storage temperature - 55 +150 c operating junction temperature t j - 40 +1 25 c esd rating v hb m human body model ( hb m) (1) 20 00 v v cdm charged device model ( cd m) (2) 500 v note: stresses beyond the values listed may cause a permanent damage to the device. the device may not operate under these conditio ns, but it will not be destroyed. note 1: jedec document jep155 states that 500v hbm allows safe manufacturing with a standard esd control process. note 2 : jedec document jep157 states that 250v cdm allows safe manufacturing with a standard esd control process. recommended operating conditions all voltages with respect to ground. parameter symbol conditions min typ max unit operating ambient temperature t a - 40 +27 + 12 5 c operating supply voltage v in 2.2 3.0 3. 6 v piezo resonance frequency f piezo 2 3.4 5 khz electrical characteristics t a = - 40c to + 12 5c, typical values at t a = + 27c, v in = 3.0 v, c in = 10 ? f, c f1 = c f2 = c out = 100 nf, c load = 15 nf, f feed = 3. 4khz; unless otherwise specified parameter symbol conditions min typ max unit output voltage vout vin = 3 .0 v , t a =+27 c 7.2 9 v shutdown current i sd en = low 0.1 1 a current consumption i dd en=high, vin=3.0v charge pump ( no loading) 2. 4 5 m a en=high, vin=3.0v c load = 15 nf, f feed = 3. 4khz 5.4 10 ma en=high, vin=3.0v pkm24sph3805 piezo , f piezo = 3. 4khz 1 4 .2 ma internal switching frequency (charge pump) f osc 0.6 1 . 15 1.8 mhz vout start - up time t on no piezo loading p ower - up when en=vdd start - up from en pin control 5 3 0 4 7 0 1000 1000 s en input threshold vih (1) 0.9 v vil 0.4 v en input current iih (2) en = 3v , vin = 3v en = 0.4v 0.01 1 1 2 a iil en = 0v , vin = 3v 0.01 1 a note 1 : en input can be driven even from low supply voltage controller due to low 0.9v vih min threshold. note 2 : en input ha s active pull - down by 400k which is disabled to save current when inputs are pulled high.
da6241.00 5 31 january , 201 9 6 ( 9 ) device outline configuration top marking information: 6241 = product number vvv = version yww = year week qfn - 12 3x3 x0.75 pin description pin name pin type function note en 1 di enable input for on/off control off: en=low on: en=high 2 nc 1 feed 3 a i input for piezo sounder feedback terminal vob 4 do output for piezo sounder brass (ground) terminal vos 5 do output for piezo sounder silver terminal vout 6 ao charge pump output cp2 7 ai/o flying capacitor 2 positive terminal cn2 8 ai/o flying capacitor 2 negative terminal cp1 9 ai/o flying capacitor 1 positive terminal cn1 10 ai/o flying capacitor 1 negative terminal vin 11 p power supply gnd 12 g supply ground exp_pad - g exposed pad connected to gnd 1 g = ground, p = power, d = digital, a = analog, i = input, o = output , nc = not connected note 1 : on pcb the nc pin and the exposed pad are recommended to be connected to gnd
da6241.00 5 31 january , 201 9 7 ( 9 ) package (qfn - 12 3x3x0.75) outline symbol min nom max unit package dimensions a 0.70 0.75 0.8 0 mm a1 --- 0.02 0.05 mm b 0.20 0.25 0. 30 mm b2 0.1 5 0.20 0.2 5 mm c 0.18 0.20 0.2 5 mm d 2.90 3.00 3.10 mm d2 (exposed.pad) 1. 55 1.65 1. 75 mm e 0.50 bsc mm ne 1.0 0 bsc mm nd 1.0 0 bsc mm e 2.90 3.00 3.10 mm e2 (exposed.pad) 1. 55 1.65 1. 75 mm l 0.3 5 0.40 0.4 5 mm h 0. 20 0.2 5 0. 3 0 mm dimensions do not include mold or interlead flash, protrusions or gate burrs.
da6241.00 5 31 january , 201 9 8 ( 9 ) qfn - 12 3x3x0.75 pcb land pattern notes ? i/o lands should be 0.2mm longer than qfn pads and extend the same 0.2mm outside package outline ? exposed pad land size should be the same as qfn exposed pad size ? solder resist opening should be 120 ? m150 ? m larger than the land size resulting in 60 ? m75 ? m clearance between cop per land and solder resist
da6241.00 5 31 january , 201 9 9 ( 9 ) ordering information product code product package comments mas 6241 c a1 q13 06 piezo driver qfn - 12 3x3x0.75, pb f ree, rohs c ompliant tape and reel 3 000 pcs / r MAS6241 c a1wad 00 piezo driver tested inked 8 w afer , thickness 370 m MAS6241 c a1wad 05 piezo driver bare die in tray, thickness 3 70 m contact micro analog systems oy for other wafer thickness options. local distributor micro analog systems oy contacts micro analog systems oy kutomotie 16 fi - 00380 helsinki, finland tel. +358 10 835 1100 http://www.mas - oy.com notice micro analog systems oy (mas) reserves the right to make changes to the products contained in this data sheet in order to improve the design or performance and to supply the best possible products. mas assumes no responsibility for the use of any circuits sho wn in this data sheet, conveys no license under any patent or other rights unless otherwise specified in this data sheet, and makes no claim that the circuits are free from patent infringement. applications for any devices shown in this data sheet are for illustration only a nd mas makes no claim or warranty that such applications will be suitabl e for the use specified without further testing or modification. mas products are not authorized for use in safety - critical applications (such as life support) where a failure of the mas product would reasonably be expected to cause severe personal injury or death. buyers represent that they have all necessary expertise in the safety and regulatory ramifications of their applications, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety - related requirements concern ing their products and any use of mas products in such safety - critical applications, notwithstanding any applications - related information or support that may be provided by mas. further, buyers must fully indemnify mas and its representatives against any d amages arising out of the use of mas products in such safety - critical applications. mas products are neither designed nor intended for use in military/aerospace applications or environments. buyers acknowledge and agree that any such use of mas products wh ich mas has not designated as military - grade is solely at the buyer's risk, and that they are solely responsible for compliance with all legal and regulatory requirements in connection with such use. mas products are neither designed nor intended for use i n automotive applications or environments. buyers acknowledge and agree that, if they use any non - designated products in automotive applications, mas will not be responsible for any failure to meet such requirements.
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