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1 AAT4901 data sheet buffered power full bridge skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 202218b skyworks proprietary information products and product information are subject to change without notice. march 20, 2014 ge n e r a l d e scr ipt ion the AAT4901 fastswitch? is a member of skyworks' application specific power mosfet (aspm?) product family. it is a full-bridge buffered power stage operating with an input voltage range of 2.0v to 5.5v. the device is designed to operate with a switching frequency of up to 2mhz, minimizing the cost and size of external com- ponents. the AAT4901 is protected from shoot-through current by integrated break-before-make circuitry. the drivers can be independently controlled and their propa- gation delay, from input to output, is typically between 8ns-19ns dependent upon logic option. four options are offered providing a single input control, dual input control or as two independent half-bridges. other features include low r ds(on) and low quiescent cur- rent allowing for high efficiency performance. the AAT4901 includes thermal protection to safeguard the device under extreme operating conditions. the AAT4901 is available in the space-saving, pb-free 8-pin sc70jw package and is rated over the -40c to +85 ? c temperature range. fe a t u r e s v in range: 2.0vC5.5v r ds(on) : ?? high-side 240m ?? low-side 200m break-before-make shootCthrough protection 4 options ?? single control input with enable?? two logic versions ?? dual control input with brake function ?? dual half-bridge low quiescent current: ?? 10 a (max) dc ?? 5ma (max) at 1mhz over-temperature protection -40c to +85c temperature range sc70jw-8 package applica t ion s ?? dc motor drive ?? door locks ?? dual low-side mosfet gate driver ?? fan motors ?? high frequency dc/dc converters ?? high speed line drive ?? proximity detectors typica l applica t ion s AAT4901-1 outa outb in gnd ena enb c in downloaded from: http:///
2 AAT4901 data sheet buffered power full bridge skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 202218b skyworks proprietary information products and product information are subject to change without notice. march 20, 2014 pin d e scr ipt ion s pin # sym bol fu n ct ion - 1 , - 2 , - 4 - 3 1 ena active high enable signal. 2 in supply voltage input; input voltage range from 2.0v to 5.5v. 3 enb active high enable signal. 4 n/c enc 4901-1/-2/-4: no connection. 4901-3: active high enable signal. 5 gnd ground connection 6 outb output of half-bridge b. connect to load. 7 outa output of half-bridge a. connect to load. 8 n/c end 4901-1/-2/-4: no connection. 4901-3: active high enable signal. pin con figu r a t ion sc7 0 jw - 8 ( top vie w ) in enb n/c n/couta outb gnd ena 12 3 45 6 7 8 in enb enc endouta outb gnd ena 12 3 45 6 7 8 aat4 9 0 1 - 1 / - 2 / - 4 aat4 9 0 1 - 3 downloaded from: http:///
3 AAT4901 data sheet buffered power full bridge skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 202218b skyworks proprietary information products and product information are subject to change without notice. march 20, 2014 absolu t e m a x im u m ra t in gs 1 sym bol d e scr ipt ion va lu e un it s v in in to gnd -0.3 to 6.0 v v en ena, enb, enc, end to gnd -0.3 to v in + 0.3 v v out out to gnd -0.3 to v in + 0.3 v i max maximum continuous switch current 0.7 a i max(pk) maximum peak current 3 a t lead maximum soldering temperature (at leads) 300 c th e r m a l i n for m a t ion sym bol d e scr ipt ion va lu e un it s p d maximum power dissipation (t a = 25c) 440 mw ? ja thermal resistance 2 225 c/w t j operating junction temperature range -40 to 150 c 1. stresses above those listed in absolute maximum ratings may cause permanent damage to the device. functional operation at conditions other than the operating conditions specified is not implied. only one absolute maximum rating should be applied at any one time. 2. mounted on a fr4 board. downloaded from: http:///
4 AAT4901 data sheet buffered power full bridge skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 202218b skyworks proprietary information products and product information are subject to change without notice. march 20, 2014 ele ct r ica l ch a r a ct e r ist ics 1 v in = 5v, t a = -40 to 85c unless otherwise noted. typical values are at t a = 25c. sym bol d e scr ipt ion con dit ion s m in typ m a x un it s v in operation voltage 2.0 5.5 v i qac ac quiescent current in = 5v, enb (d) = in, ena (c) = 1mhz, i out = 0 AAT4901-1 3 5 ma AAT4901-2 1.6 4 AAT4901-3 1.6 4 AAT4901-4 0.9 2.5 i qdc dc quiescent current in = 5v, enb (d) = in, ena (c) = gnd, i out = 0 AAT4901-1 5.5 10.0 a AAT4901-2 AAT4901-3 AAT4901-4 i q(off) off-supply current enb (d) = ena (c) = gnd, in = out = 5.5v 1.0 a i sd(off) off-switch current enb (d) = gnd, in = 5.5v, v out = 0, or out = in 0.03 1 a r ds(on)h high side mosfet on-resistance v in = 4.5v 240 m ? v in = 3.0v 270 v in = 2.0v 360 r ds(on)l low side mosfet on-resistance v in = 4.5v 200 m ? v in = 3.0v 230 v in = 2.0v 300 v onl ena (c), enb (d) input low voltage 0.4 v v onh ena (c), enb (d) input high voltage 1.5 v v hys ena (c), enb (d) input hysteresis 200 mv i sink ena (c), enb (d) input leakage ena (c) , enb (d) = 5.5v 0.01 1.0 a t bbm break-before-make time ena (c) rising 5.0 ns ena (c) falling 5.0 ns t shdh chip thermal shutdown temperature threshold 145 c hysteresis 25 t on-dly ena (c) to out delay ena (c) rising AAT4901-1 15 ns AAT4901-2 15 AAT4901-3 8 AAT4901-4 14 ena (c) falling AAT4901-1 18 ns AAT4901-2 15 AAT4901-3 7 AAT4901-4 19 t hiz enb to out hiz delay ena (c) = gnd AAT4901-1 12 ns AAT4901-2 10 AAT4901-3 10 AAT4901-4 12 ena (c) = in AAT4901-1 11 ns AAT4901-2 10 AAT4901-3 7 AAT4901-4 12 1. the AAT4901 is guaranteed to meet performance specifications over the C40c to +85c operating temperature range and is assu red by design, characterization, and correla- tion with statistical process controls. downloaded from: http:///
5 AAT4901 data sheet buffered power full bridge skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 202218b skyworks proprietary information products and product information are subject to change without notice. march 20, 2014 typica l ch a r a ct e r ist ics AAT4901-1 ac quiescent current vs. input voltage (enb = in; ena = 1mhz; i out = 0a; t a = 25c) input voltage (v) ac quiescent current (ma) 0.5 1.2 1.9 2.6 3.3 4.0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 AAT4901-2 ac quiescent current vs. input voltage (enb = in; ena = 1mhz; i out = 0a; t a = 25c) input voltage (v) ac quiescent current (ma) 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 AAT4901-3 ac quiescent current vs. input voltage (enb = in; ena = 1mhz; i out = 0a; t a = 25c) input voltage (v) ac quiescent current (ma) 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0.0 0.3 0.6 0.9 1.2 1.5 AAT4901-4 ac quiescent current vs. input voltage (enb = in; ena = 1mhz; i out = 0a; t a = 25c) input voltage (v) ac quiescent current (ma) 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 0.0 0.3 0.6 0.9 1.2 1.5 AAT4901-1 ac quiescent current vs. switching frequency (enb = in; ena = 0.1khz~2000khz; v onh = 2v; i out = 0a; t a = 25c) switching frequency (khz) ac quiescent current (ma) 0.1 1 10 100 1000 10000 0.001 0.01 0.1 1 10 v in = 5.0v v in = 3.0v AAT4901-2 ac quiescent current vs. switching frequency (enb = in; ena = 0.1khz~2000khz; v onh = 2v; i out = 0a; t a = 25c) switching frequency (khz) ac quiescent current (ma) 0.1 1 10 100 1000 10000 0.001 0.01 0.1 1 10 v in = 5.0v v in = 3.0v downloaded from: http:///
6 AAT4901 data sheet buffered power full bridge skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 202218b skyworks proprietary information products and product information are subject to change without notice. march 20, 2014 typica l ch a r a ct e r ist ics AAT4901-3 ac quiescent current vs. switching frequency (enb = in; ena = 0.1khz~2000khz; v onh = 2v; i out = 0a; t a = 25c) switching frequency (khz) ac quiescent current (ma) 0.1 1 10 100 1000 10000 0.001 0.01 0.1 1 10 v in = 5.0v v in = 3.0v AAT4901-4 ac quiescent current vs. switching frequency (enb = in; ena = 0.1khz~2000khz; v onh = 2v; i out = 0a; t a = 25c) switching frequency (khz) ac quiescent current (ma) 0.1 1 10 100 1000 10000 0.001 0.01 0.1 1 10 v in = 5.0v v in = 3.0v AAT4901-1 ac quiescent current vs. temperature (enb = in, ena = 1mhz; i out = 0a) temperature (c) ac quiescent current (ma) 0 1 2 3 4 -40 -15 10 35 85 60 v in = 5.0v v in = 3.0v AAT4901-2 ac quiescent current vs. temperature (enb = in, ena = 1mhz; i out = 0a) temperature (c) ac quiescent current (ma) 0 1 2 3 4 -40 -15 10 35 85 60 v in = 5.0v v in = 3.0v AAT4901-3 ac quiescent current vs. temperature (enb = in, ena = 1mhz; i out = 0a) temperature (c) ac quiescent current (ma) -40 -15 10 35 85 60 0 1 2 3 4 5 v in = 5.0v v in = 3.0v AAT4901-3 ac quiescent current vs. temperature (enb = in, ena = 1mhz; i out = 0a) temperature (c) ac quiescent current (ma) -40 -15 10 35 85 60 0 0.5 1 1.5 2 v in = 5.0v v in = 3.0v downloaded from: http:///
7 AAT4901 data sheet buffered power full bridge skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 202218b skyworks proprietary information products and product information are subject to change without notice. march 20, 2014 typica l ch a r a ct e r ist ics low side r ds(on) vs. output current (t a = 25c) output current (a) r ds(on) (m) 50 100 150 200 250 300 350 100 200 300 400 500 600 700 v in = 4.5v v in = 3.0v v in = 2.0v high side r ds(on) vs. output current (t a = 25c) output current (a) r ds(on) (m) 100 150 200 250 300 350 400 100 200 300 400 500 600 700 v in = 4.5v v in = 3.0v v in = 2.0v low side r ds(on) vs. temperature (i out = 0.7a) temperature (c) r ds(on) (m ) 100 150 200 250 300 350 400 -40 -15 10 35 60 85 v in = 4.5v v in = 3.0v v in = 2.0v high side r ds(on) vs. temperature (i out = 0.7a) temperature (c) r ds(on) (m ) 150 200 250 300 350 400 450 -40 -15 10 35 60 85 v in = 4.5v v in = 3.0v v in = 2.0v mosfets r ds(on) vs. input voltage (i out = 0.7a; t a = 25c) input voltage (v) r ds(on) (m) 100 150 200 250 300 350 400 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 high side low side AAT4901 enable a/b/c/d threshold voltage vs. input voltage input voltage (v) enable threshold voltage (v) 2 2.5 3 3.5 4 4.5 5 5.5 0 0.2 0.4 0.6 0.8 1 1.2 1.4 v ih , -40c v il , -40c v ih , 25c v il , 25c v ih , 85c v il , 85c downloaded from: http:///
8 AAT4901 data sheet buffered power full bridge skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 202218b skyworks proprietary information products and product information are subject to change without notice. march 20, 2014 fu n ct ion a l d e scr ipt ion the AAT4901 is a buffered full-bridge driver ic with options to allow the device to function as two independent half-bridges. the output stage is capable of driving output loads of up to 0.7a and features break-before-make tim- ing and very fast propagation delay time, allowing high switching speed up to 2mhz. the enable input (en), when driven low, turns off the driver and reduces the operating current to less than 1 a. over-temperature shutdown protects the AAT4901 in the case of overload or defective mosfet. logic options allow the AAT4901 to be used as a small dc motor driver with break function, a solenoid driver, a dual-low-side mosfet driver, or as a coil driver. applications include motor drive, proximity detectors, electronic locks, and dc-dc converters. fu n ct ion a l block d ia gr a m AAT4901-3 only control logic ena in gnd outa outb enb enc end downloaded from: http:///
9 AAT4901 data sheet buffered power full bridge skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 202218b skyworks proprietary information products and product information are subject to change without notice. march 20, 2014 opt ion s aat4 9 0 1 - 1 h-bridge configuration with two enables. enable b is active high and enables the h-bridge output. enable a toggles the h-bridge outputs a and b in anti-phase. in steady state, this can provide forward/reverse motor drive signals. aat4 9 0 1 - 2 h-bridge configuration with two enables. enable a and enable b are in anti-phase and provide forward/reverse and braking. aat4 9 0 1 - 3 dual independent half-bridge configuration with four enables. function similar to 2 x aat4900. aat4 9 0 1 - 4 h-bridge with two enables. enable a and enable b are in anti-phase and toggle the h-bridge outputs a and b in anti-phase respectively. in steady state, this can provide forward/reverse motor drive signals to adjust the motor speed by various duty cycles. aat4 9 0 1 - 1 / - 4 logic ta ble - 1 - 4 outa outb en a en b en a en b 0 0 0 0 hi z hi z 1 0 1 1 hi z hi z 0 1 1 0 in gnd 1 1 0 1 gnd in aat4 9 0 1 - 2 logic ta ble en a en b outa outb 0 0 hi z hi z 1 0 in gnd 0 1 gnd in 1 1 in in aat4 9 0 1 - 3 logic ta ble en a/ c en b/ d outa/ b 0 0 hi z 1 0 hi z 01i n 1 1 gnd tim in g d ia gr a m v_ena v_outa t on-dly-r t on-dly -f 50% 50% t on-dly -r t on-dly -f 50% 50% t hiz_gnd t on-dly -r t hiz_in t on-dly -f 50% 50% 50% 50% 10% 90% 90% 10% v_enb v_outb hi z hi z hi z hi z (off) (off) (off) (off) figu r e 1 : aat4 9 0 1 - 4 tim in g d ia gr a m . downloaded from: http:///
10 AAT4901 data sheet buffered power full bridge skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 202218b skyworks proprietary information products and product information are subject to change without notice. march 20, 2014 applica t ion i n for m a t ion i n pu t su pply ca pa cit or the input capacitor provides a low impedance loop for the edges of pulsed current drawn by the AAT4901 and reduces the surge current drawn from the input power. a 4.7 f to 10 f x7r or x5r low esr/esl ceramic capac- itor is selected for the input supply decoupling. to mini- mize the tray resistance, the capacitor should be placed as closely as possible to the input pin. this keeps the high frequency content of input current localized, mini- mizing emi and input voltage ripple. sh oot - th r ou gh pr ot e ct ion the internal high-side and low-side mosfets of the AAT4901 cannot conduct at the same time to prevent shoot-through current. when the high-side mosfet turns on, the low-side mosfet turns off first; after 5ns break-before-make time, the high-side mosfet then turns on. similarly, before the low-side mosfet turns on, the high-side mosfet turns off; after a certain break-before-make time (5ns typ.), the low-side mosfet turns on. the dead time between the high-side and low- side turn-on should be kept as low as possible to mini- mize current flows through the body diode of the high- side and/or low-side mosfet(s). the break-before-make shoot-through protection significantly reduces losses associated with the driver at high frequency. th e r m a l ca lcu la t ion s in the dual low-side mosfet driver application, the power dissipation of the AAT4901 includes the power dissipation in the mosfets due to charging and discharging the gate capacitance, the ac quiescent current power dissipation, and transient power in the driver during output transi- tions. as the transient power is usually very small, its losses can be ignored. maximum package power dissipa- tion can be estimated by the following equation: eq. 1 : t j(max) - t a ja p d(max) = v cc i in = = i qac v cc + q g(tot) f sw v cc where:t j(max) = junction temperature of the dice (c). t a = ambient temperature (c). ja = thermal resistance (225c/w). i qac = ac quiescent current of the driver (ma). q g(tot) = total gate charge of external low side mosfets (nc). f sw = switching frequency (mhz). the maximum junction temperature for the sc70jw-8 package can be derived from equation 1: eq. 2 : t j(max) = p d(max) ja + t a for example, if the AAT4901 drives 2 aat9560 mosfets whose maximum gate charge is specified as 13nc for v gate = 5v, the total power dissipation in the driver at a switching frequency of 1mhz equals: p d(tot) = 2 (5v 13nc 1mhz) + 5v 4.0ma = 150m w ga t e d r ive cu r r e n t ra t in gs assuming that the maximum gate charge of the dual low-side mosfets are equal, the maximum gate drive capability for the designed maximum junction tempera- ture without an external resistor can be derived from equation 1: eq. 3 : 1 2 f sw t j(max) - t a ja v in q g(max) = - i qac the relationship between gate capacitance, turn-on/ turn-off time, and the mosfet driver current rating can be determined by: eq. 4 : i g(max) = c g(max) dv dt where:i g(max) = peak drive current for a given voltage c g(max) = maximum gate capacitance dv = mosfet gate-to-source voltage dt = rising time of mosfet gate-to-source voltage downloaded from: http:///
11 AAT4901 data sheet buffered power full bridge skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 202218b skyworks proprietary information products and product information are subject to change without notice. march 20, 2014 the relationship between c g(max) , q g(max) , and v gate is given by: eq. 5 : q g(max) v gate c g(max) = the peak current drive requirements for a given mosfet gate voltage can be derived from equations 4 and 5: eq. 6 : i g(max) = q g(max ) dt d e sign ex a m ple v in = 5v v gate = 5v f sw = 1mhz ja = 225c/w i qac = 4.0ma t j(max) = 120c t a = 85c t rise = dt = 10ns 1 2 1mhz 120c - 85c 225c/w 5v q g(max) = - 4.0ma = 13.6nc q g(max) v gate c g(max) = = = 2.7nf 13.6nc 5v i g(max) = = = 1.36 a q g(max) dt 13.6nc 10ns typica l applica t ion s 2 - ph a se syn ch r on ou s bu ck con ve r t e r the most common AAT4901 applications include multi- phase dc/dc converter output power stages, dc motor drive, a dual low-side mosfet driver, and a 3-state high- speed high-current line driver. figure 2 shows a typical configuration when used as a 2-phase buck converter power stage with synchronous rectification. the en pin can be used to force outputs outa/outb to a high impedance state; this allows the output inductor to operate in discontinuous condition mode (dcm) and improves efficiency under light load conditions. the body diode associated with the low-side switching device gives the AAT4901 inductive switching capability, and clamps the lx node at one diode drop below gnd during the break-before-make time. the multiphase buck converter assures a stable, high-perfor- mance topology for high currents and low voltages which are demanded in computers, workstation, telecom and datacom servers. figure 3 illustrates output ripple cur- rent reduction due to 2-phase cancellation. m ot or d r ive the AAT4901 is ideally suited for use as an efficient out- put driver for dc motor control due to its full-bridge output stage with integrated mosfets. the inductive load switching capability of the AAT4901 eliminates the need for external diodes during commutation time. in applications where rotation is always in the same direc- tion, a single half-bridge aat4900 can be used to drive a dc motor. if needed to control the rotation in both directions, full-bridge motor control circuits can be applied as shown in figure 4. in this configuration the motor can be controlled to run clockwise, counter-clock- wise, stop rapidly (regeneration braking) or free run (coast) to a stop. downloaded from: http:///
12 AAT4901 data sheet buffered power full bridge skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 202218b skyworks proprietary information products and product information are subject to change without notice. march 20, 2014 ena 1 in 23 enb 4 enc end outaoutb gnd 87 6 5 AAT4901-3 v in : 2.0v ~ 5.5v c in l1 l2 c o r1 r2 v out vccgnd fb pwm1 sw1 pwm2 sw2 2 -phase dc/dc controller il1 il2 il1 + il2 on/off (en) figu r e 2 : aat4 9 0 1 in 2 - ph a se syn ch r on ou s bu ck con ve r t e r pow e r st a ge . outa outb il1 il2 il1+il2 figu r e 3 : ou t pu t cu r r e n t ripple re du ct ion ( i l1 + i l2 ) du e t o 2 - ph a se ca n ce lla t ion . when the voltage applied between the dc motor by the input(s) logic control is reversed, it could change the rotation direction. when both outputs (outa/outb) are floating, the motor winding acts as a regeneration; the current inside the motor winding would continue to flow into the input capacitor through the internal mosfet parasitic diode and decay to zero rapidly, stopping the motor rapidly. when both outputs are connected to the input supply (or ground) simultaneously, the motor coasts and the winding current decays slowly due to the winding resistor until the motor free runs to a stop. the speed of a dc motor is directly proportional to the supply voltage. it can be controlled by simply adjusting the voltage sent to the motor, but this is quite inefficient. a better method is to switch the motors supply on and off rapidly. if the switching is fast enough, the motor doesnt notice it, it only notices the average effect. the time it takes a motor to speed up and slow down under switching conditions is dependent on the inertia of the rotor (basically how heavy it is) and the amount of fric- tion and load torque. figure 5 shows the speed of a motor that is being turned on and off at a fairly low switching frequency. the average speed is around 150, although it varies quite a bit. if the supply voltage is switched quick- ly enough, the motor will not have time to change speed much and the speed will be quite steady. when the duty cycle (d = t on /t) is increased, the average speed of the motor increases. thus the speed is controlled by the duty cycle of the pwm (pulse width modulation). downloaded from: http:///
13 AAT4901 data sheet buffered power full bridge skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 202218b skyworks proprietary information products and product information are subject to change without notice. march 20, 2014 m m ena 1 in 23 enb 4 n/c n/c outa outb gnd 87 6 5 12 3 4 87 6 5 12 3 4 87 6 5 AAT4901-2 m m m m ena 1 in 23 enb 4 n/c n/c outaoutb gnd 87 6 5 AAT4901-4 ena in enbenc end outaoutb gnd AAT4901-3 ena in enbn/c n/c outaoutb gnd AAT4901-1 v in : 2.0~5.5v v in : 2.0~5.5v v in : 2.0~5.5v v in : 2.0~5.5v c1 4.7f/16v c1 4.7f/16v c1 4.7f/16v c1 4.7f/16v m m clk/dir clk/dir clk/dir clk/dir clk/dir en en brakebrake figu r e 4 : fu ll- br idge m ot or d r ive r usin g aat4 9 0 1 . time motor speed 100 50 0 150 200 supply voltage 0 5 10 15 20 motor speed supply voltage ton t figu r e 5 : m ot or spe e d vs. su pply volt a ge . downloaded from: http:///
14 AAT4901 data sheet buffered power full bridge skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 202218b skyworks proprietary information products and product information are subject to change without notice. march 20, 2014 the minimum switching frequency is chosen based on motor characteristics (the equivalent inductance and the parasitic series resistor) and the percentage of current variation to the average current specified. the minimum switching frequency is in direct proportion to the para- sitic series resister, and in inverse proportion to the equivalent inductance and allowable current ripple. when driving a high-voltage dc motor, external high- voltage mosfets are needed to commutate the motor. in this application, the AAT4901 can be configured as a double-ended gate driver, as illustrated in figure 6. the full-bridge power stage operates the motor drive con- trol as shown in figure 7. each side of the motor can be connected either to the battery's positive terminal or to the battery's negative terminal through the switch. note that only one mosfet on each side of the motor may be turned on at any one time; otherwise the high-side and low-side mosfets will short out the battery and burn out. there is also a diode connected in reverse across the field winding, to absorb the current in the field winding when all four mosfets in the bridge are turned off. during period (a), to make the motor run forwards, q4 is turned on, and q1 has the pwm signal applied to it. the current path is shown in blue in figure 7. at period (b) q4 is kept on, so when the q1 pwm signal is off, cur- rent can continue to flow around the bottom loop through q3s parasitic diode. at period (c), to make the motor run backwards or control the speed, q3 is turned on, and q2 has the pwm signal applied to it. at period (d), q3 is kept on, so when the q2 pwm signal is off, current can continue to flow around the bottom loop through q4s parasitic diode. at period (e), when the motor is running forwards for example, the motor is now acting as a generator and forcing current through its armature, through q2s diode, through the battery (thereby charging the battery) and back through q3s diode. ena 1 in 23 enb 4 n/c(enc) n/c(end) outa outb gnd 87 6 5 AAT4901-1,-2,-4 (-3) v in : 5.0v c1 4.7f/16v clk1 high-voltage rail to moto r clk2 figu r e 6 : d ou ble - en de d ga t e d r ive r . downloaded from: http:///
15 AAT4901 data sheet buffered power full bridge skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 202218b skyworks proprietary information products and product information are subject to change without notice. march 20, 2014 d u a l ch a n n e l, h igh spe e d, h igh cu r r e n t 3 - st a t e lin e d r ive r the AAT4901-3 is ideally suited for dual channel, high speed, high current 3-state line driver applications such as ccd clock drivers. the low quiescent power dissipation makes this part attractive in battery powered products. the 3a peak drive capability also makes the AAT4901-3 an excellent choice for driving high speed capacitive lines. the 20ns fast switching/delay time allows clocking speeds up to 10mhz. d u a l low - side m osfet d r ive r the AAT4901-3 is also ideally suited for dual low-side mosfet driver applications due to its dual independent half-bridge output configuration. it can be used in a push-pull topology as illustrated in figure 9 or in other applications which require the ability to drive the mosfets quickly, due to the AAT4901's extremely low r ds(on) (240m typ.) and very fast propagation time (20ns typ.) lf armature la field winding v bat + v bat - q1q3 q2q4 lf armature la field winding v bat + v bat - q1q3 q2q4 lf armature la field winding v bat + v bat - q1q3 q2q4 lf armature la field winding v bat + v bat - q1q3 q2q4 ia period (a) ia period (b) period (c) period (d) ia ia lf armature la field winding v bat + v bat - q1q3 q2q4 period (e) ia figu r e 7 : fu ll- br idge m ot or d r ive con t r ol. downloaded from: http:///
16 AAT4901 data sheet buffered power full bridge skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 202218b skyworks proprietary information products and product information are subject to change without notice. march 20, 2014 ena enb 3-state enc 3-state end in outa outb gnd figu r e 8 : aat4 9 0 1 - 3 d u a l ch a n n e l h igh - spe e d h igh - cu r r e n t 3 - st a t e lin e d r ive r . v in + + v out ena 1 in 23 enb 4 enc end outa outb gnd 87 6 5 AAT4901-3 v cc : 5.0v c1 4.7f/16v pwm a en pwm b figu r e 9 : pu sh - pu ll topology m osfet d r ive r w it h aat 4 9 0 1 . downloaded from: http:///
17 AAT4901 data sheet buffered power full bridge skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 202218b skyworks proprietary information products and product information are subject to change without notice. march 20, 2014 vin 2 1 3 jp 1 2 1 3 jp 2 2 1 3 jp 3 2 1 3 jp 4 gnd gnd m1 m2 m3 m4 outb outa motor load l1 c2 l2 c3 tp1 tp2 c1 gnd c ena 1 in 2 enb 3 enc 4 gnd 5 outa 7 outb 6 end 8 AAT4901 u1 4.7f figu r e 1 0 : aat4 9 0 1 eva lu a t ion boa r d sch e m a t ic. figu r e 1 1 : aat4 9 0 1 eva lu a t ion boa r d figu r e 1 2 : aat 4 9 0 1 eva lu a t ion boa r d top side la you t . bot t om side la you t . com pon e n t pa r t n u m be r d e scr ipt ion m a n u fa ct u r e r u1 AAT4901 buffered power full bridge skyworks c1 grm21br61c475ka88 cap ceramic 4.7 f 0805 x5r 16v 10% murata c2, c3 not populated l1, l2 not populated load not populated ta ble 1 : aat4 9 0 1 eva lu a t ion boa r d bill of m a t e r ia ls . downloaded from: http:///
18 AAT4901 data sheet buffered power full bridge skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 202218b skyworks proprietary information products and product information are subject to change without notice. march 20, 2014 or de r in g i n for m a t ion pa ck a ge m a r k in g 1 pa r t n u m be r ( ta pe a n d re e l) 2 sc70jw-8 d2ryy aat4 9 0 1 i js- 1 - t1 sc70jw-8 d3ryy aat4 9 0 1 i js- 2 - t1 sc70jw-8 d4ryy aat4 9 0 1 i js- 3 - t1 sc70jw-8 2sryy aat4 9 0 1 i js- 4 - t1 skyworks green? products are compliant with all applicable legislation and are halogen-free. for additional information, refer to skyworks de?ition of green , document number sq04-0074. pa ck a ge i n for m a t ion sc7 0 jw - 8 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 measurements in millimeters. 1. xxgyy: xx denotes device code, g denotes assembly code, and yy denotes date code. 2. sample stock is generally held on part numbers listed in bold . downloaded from: http:///
19 AAT4901 data sheet buffered power full bridge skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 202218b skyworks proprietary information products and product information are subject to change without notice. march 20, 2014 copyright ? 2012-2014 skyworks solutions, inc. all rights reserved. information in this document is provided in connection with skyworks solutions, inc. (skyworks) products or services. these materials, including the information contained herein, are provided by sky works as a service to its customers and may be used for informational purposes only by the customer. skyworks assumes no responsibility fo r errors or omissions in these materials or the information contained herein. sky- works may change its documentation, products, services, speci ? cations or product descriptions at any time, without notice. skyworks makes no commitment to update the materials or information and shall have no responsibility whatsoever for con ? icts, incompatibilities, or other dif ? culties arising from any future changes. no license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. skyworks assumes no liability for any materials, products or informatio n provided here- under, including the sale, distribution, reproduction or use of skyworks products, information or materials, except as may be provided in skyworks terms and conditions of sale. the materials, products and information are provided as is without warranty of any kind, whether express, implied, statutory, or otherwise, including fitness for a particular purpose or use, merchantability, performance, quality or non-infringement of any intellectual property right; all such warranti es are hereby expressly disclaimed. skyworks does not warrant the accuracy or completeness of the information, text, graphics or other items contained within these materials. skyworks shall not be liable for any damages, in- cluding but not limited to any special, indirect, incidental, statutory, or consequential damages, including without limitation, lost revenues or lost profits that may result from the use of the materials or information, whether or not the recipient of materials has been advised of the possibility of such damage. skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the skyworks products could lead to personal injury, death, physical or en- vironmental damage. skyworks customers using or selling skyworks products for use in such applications do so at their own risk and agree to fully indemnify skyworks for any damages resulting from such improper use or sale. customers are responsible for their products and applications using skyworks products, which may deviate from published speci ? cations as a result of design defects, errors, or operation of products outside of pub- lished parameters or design speci ? cations. customers should include design and operating safeguards to minimize these and other risks. skyworks assumes no liabi lity for applications assistance, customer product design, or damage to any equipment resulting from the use of skyworks products outside of stated published speci ? cations or parameters. skyworks, the skyworks symbol, and breakthrough simplicity are trademarks or registered trademarks of skyworks solutions, inc., in the united states and other countries. third-party brands and names are for identi ? cation purposes only, and are the property of their respective owners. additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference. downloaded from: http:///

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