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designed for pulse-width-modulated (pwm) control of low- voltage stepper motors and single and dual dc motors, the a3916 is capable of output currents up to 1 a per channel and operating voltages from 2.7 to 15 v. the a3916 has an internal fixed off-time pwm timer that sets a peak current based on the selection of a current sense resistor. an output fault flag is provided that notifies the user of a tsd or overcurrent protection event. the a3916 is supplied in a low-profile 3 3 mm 16-terminal qfn (suffix es) and a low-profile 4 4 mm 20-terminal qfn (suf fixes es, -1) both with exposed power tabs for enhanced thermal dissipation. a3916-ds, rev. 1 ? wide, 2.7 to 15 v input voltage operating range ? dual dmos full-bridges: drive two dc motors or one stepper motor ? low r ds(on) outputs ? synchronous rectification for reduced power dissipation ? low-current sleep mode ? overcurrent protection ? internal uvlo and thermal shutdown circuitry ? integrated charge pump ? pin-to-pin compatible with a3906 dual dmos full-bridge motor driver packages: figure 1 : typical applications not to scale a3916 features and benefits description 16-contact qfn 3 mm 3 mm (suffix es) 20-contact qfn 4 mm 4 mm (suffix es,-1) sense1 out1a out1b vbb vcp 0.1 f 2.7 to 15 v in2 clk in3 in4 faultn in1 sleepn gnd step motor dc motor sense2 out2a out2b dc motor a3916 sense1 out1a out1b vbb vcp 0.1 f 2.7 to 15 v in2 clk in3 in4 faultn in1 sleepn gnd sense2 out2a out2b a3916 october 6, 2016
2 absolute maximum ratings characteristic symbol notes rating unit supply voltage v bb 15 v output current i out continuous 1.0 a output current (parallel mode) i out(par) continuous 1.8 a sense voltage v sensex continuous 0.5 v pulsed, t w < 1 s 2.5 v logic input voltage range v io C0.3 to 5.5 v junction temperature t j(max) 150 c storage temperature range t stg C55 to 150 c operating temperature range t a range g C40 to 105 c selection guide part number packaging packing A3916GESTR-T 3 3 mm 16-contact qfn package 1500 pieces per 7-inch reel A3916GESTR-T-1 4 4 mm 20-contact qfn package 1500 pieces per 7-inch reel thermal characteristics : may require derating at maximum conditions; see application information characteristic symbol test conditions* value unit 3 3 mm es package r ja 4-layer pcb based on jedec standard 47 c/w 4 4 mm es-1 package 4-layer pcb based on jedec standard 37 c/w *additional thermal information available on the allegro website. specifications dual dmos full-bridge motor driver a3916 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
3 terminal list table number name function es es, -1 1 2 gnd ground 2 3 sleepn active-low sleep input 3 4 in1 control input 4 5 in2 control input 5 6 in3 control input 6 7 in4 control input 7 8 faultn open-drain logic output 8 10 out2a dmos h-bridge 2, output a 9 11 sense2 sense resistor terminal, bridge 2 10 12 out2b dmos h-bridge 2, output b 11 13 vbb motor supply voltage 12 14 out1b dmos h-bridge 1, output b 13 15 sense1 sense resistor terminal, bridge 1 14 16 out1a dmos h-bridge 1, output a 15 17 vcp charge pump capacitor 16 1,9,18,19,20 nc no internal connection C C pad exposed pad for enhanced thermal performance pinout diagrams and terminal list table 16-contact qfn (es) package pad 12 11 10 9 1 2 3 4 5 6 7 8 16 15 14 13 nc vcp out1a sense1 in3 in4 faultn out2a out1b vbb out2b sense2 gnd sleepn in1 in2 pad 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 nc nc nc vcp out1a in3 in4 faultn nc out2a sense1 out1b vbb out2b sense2 nc gnd sleepn in1 in2 20-contact qfn (es, -1) package dual dmos full-bridge motor driver a3916 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
4 functional block diagram vreg sense1 out1a out1b vbb vcp 0.1 f 2.7 to 15 v in2 clk in3 in4 faultn in1 sleepn gnd dmos h bridge dc motor control logic sense2 out2a out2b dmos h bridge dc motor vbb vbb + - + - charge pump 200 mv tsd uvlo vbb dual dmos full-bridge motor driver a3916 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
5 electrical characteristics 1,2 : valid at t j = 25c, v bb = 2.7 to 15 v, unless noted otherwise characteristics symbol test conditions min. typ. max. unit general load supply voltage range v bb operating 2.7 C 15 v output on resistance r ds(on,hs) t j = 25c, 500 ma C 335 450 m t j = 85c, 500 ma C 410 C m r ds(on,ls) t j = 25c, 500 ma C 375 525 m t j = 85c, 500 ma C 455 C m diode forward voltage v f i = 500 ma C 0.85 1.0 v vbb supply current i bb(2p7v) outputs disabled, v bb = 2.7 v C 2.2 4.5 ma i bb(15v) outputs disabled, v bb = 15 v C 3.1 4.5 ma i bb(sleep) sleep mode C C 0.5 a control logic logic input voltage, inx v in(1) 2.0 C C v v in(0) C C 0.8 v logic input voltage, sleepn v in(1) 2.0 C C v v in(0) C C 0.4 v logic input hysteresis v hys 100 C 500 mv logic input current i in v in = 3.3 v, pulldown = 100 k? C 33 50 a fault output voltage v faultn flag asserted, i faultn = 1 ma C C 200 mv fault output leakage current i faultn v faultn = 5 v C C 1.0 a v sense blank time t blank 2.1 3.1 4.1 s v sense trip voltage v trip 170 205 240 mv fixed off-time t off 20 30 40 s protection circuits crossover delay t ocd 200 550 1000 ns vbb undervoltage lockout v bb(uvlo) v bb rising C 2.55 2.65 v vbb hysteresis v bb(uvlo,hys) C 125 C v thermal shutdown temperature t j1 150 165 180 c thermal shutdown hysteresis t j1 C 20 C c 1 typical data is for design information only. 2 specified limits are tested at a single temperature and assured over operating temperature range by design and characterization. dual dmos full-bridge motor driver a3916 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
6 control logic table 1: dc motor operation in1 in2 out1a out1b function 0 0 off off disabled 1 0 high low forward 0 1 low high reverse 1 1 low low brake in3 in4 out2a out2b function 0 0 off off disabled 1 0 high low forward 0 1 low high reverse 1 1 low low brake table 2: stepper motor operation in1 in2 in3 in4 out1a out1b out2a out2b function 0 0 0 0 off off off off disabled disabled 1 0 1 0 high low high low full step 1 ? step 1 0 0 1 0 off off high low C ? step 2 0 1 1 0 low high high low full step 2 ? step 3 0 1 0 0 low high off off C ? step 4 0 1 0 1 low high low high full step 3 ? step 5 0 0 0 1 off off low high C ? step 6 1 0 0 1 high low low high full step 4 ? step 7 1 0 0 0 high low off off C ? step 8 dual dmos full-bridge motor driver a3916 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
7 functional description device operation the a3916 is a dual full-bridge motor driver capable of operat- ing one stepper motor, two dc motors, or one high-current dc motor. mosfet output stages substantially reduce the voltage drop and the power dissipation of the a3916 outputs, compared to typical drivers with bipolar transistors. output current can be regulated by pulse-width modulating (pwm) the inputs. in addition to supporting external pwm of the driver, the a3916 limits the peak current by internally pwming the source driver when the current in the winding exceeds the peak current, as determined by a sense resistor. if internal current limiting is not needed, the sense pin should be shorted to ground. internal circuit protection includes thermal shutdown with hys- teresis, undervoltage lockout, internal clamp diodes, crossover current protection, and overcurrent protection. external pwm output current regulation can be achieved by pulse-width modu- lating the inputs. slow decay mode is selected by holding one input high while pwming the other input. holding one input low and pwming the other input results in fast decay. blanking this function blanks the output of the current sense comparator when the outputs are switched. the comparator output is blanked to prevent false overcurrent detections due to reverse recovery currents of the clamp diodes or to switching transients related to the capacitance of the load. the blank time, t blank , is approxi- mately 3 s. sleep mode an active-low control input used to minimize power consump- tion when the a3916 is not in use. this disables much of the internal circuitry including the output drivers, internal regulator, and charge pump. a logic high allows normal operation. when coming out of sleep mode, wait 1.5 ms before issuing a command to allow the internal regulator and char ge pump to stabilize. enable when all logic inputs are pulled to logic low, the outputs of the bridges are disabled. the charge pump and internal circuitry continue to run when the outputs are disabled. thermal shutdown the a3916 will disable the outputs if the junction temperature reaches 165c. when the junction temperature drops 20c, the outputs will be enabled. brake mode when driving dc motors, the a3916 goes into brake mode (turns on both sink drivers) when both of its inputs are high (in1 and in2, or in3 and in4). there is no current limiting during brak- ing, so care must be taken to ensure that the peak current during braking does not exceed the absolute maximum current. internal pwm current control each full-bridge is controlled by a fixed off-time pwm current control circuit that limits the load current to a desired value, i trip . initially, a diagonal pair of source and sink dmos outputs are enabled and current flows through the motor winding and the current sense resistor, r sensex . when the voltage across r sensex equals the internal reference voltage, the current sense compara- tor resets the pwm latch, which turns off the source driver. the maximum value of current limiting, i trip(max) , is set by the selection of the sense resistor, r sensex , and is approximated by a transconductance function: i trip(max) = 0.2 r sensex it is critical to ensure the maximum rating on sensex pins (0.5 v) is not exceeded. synchronous rectification when a pwm off-cycle is triggered by an internal fixed off-time cycle, load current recirculates in slow decay sr mode. during slow decay, current recirculates through the sink-side fet and the sink-side body diode. the sr feature enables the sink-side fet, effectively shorting out the body diode. the sink driver is dual dmos full-bridge motor driver a3916 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
8 not enabled until the source driver is turned off and the cross- over delay has expired. this feature helps lower the voltage drop during current recirculation, lowering power dissipation in the bridge. ocp if an overcurrent event occurs, both motor bridges are disabled until either sleepn is brought low or the vbb supply is cycled. faultn this is an open-drain output that is pulled low during a tsd or overcurrent event. the output is released when the die tem- perature falls below the tsd level minus the hysteresis. for an over-current event, the output is held low until either sleepn is brought low or the vbb supply is cycled. parallel operation the a3916 can be paralleled for applications that require higher output currents. in paralleled mode, the driver can source 1.8 a continuous. the a3916 has two completely independent bridges with separate overcurrent latches. this allows the device to supply two separate loads, and as a result, when paralleled, it is imperative that the internal current control is disabled by shorting the sense pins to ground. because the overcurrent trip threshold is internally fixed at 0.2 v, the trace resistance must be kept small so the internal current latch is not triggered prematurely . with acceptable margin, the voltage drop across the trace resistance should be under 0.1 v. at a peak current of 2.5 a, the trace resistance should be kept below 40 m to prevent false tripping of the overcurrent latch. each bridge has some variation in propagation delay . during this time, it is possible that one bridge will have to support the full load current for a very short period of time. propagation delays are characterized and guard banded to protect the driver from damage during these events. dual dmos full-bridge motor driver a3916 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
9 package outline drawings figure 2: 16-contact 3 mm 3 mm qfn package (suffx es) for reference only ? not for tooling use (reference jedec mo-220weed-4) dimensions in millimeters ? not to scale exact case and lead con?guration at supplier discretion within limits shown a b c 16 2 1 a 16 1 2 b 1.70 1.70 1.70 1.70 0.30 1 16 3 3 0.75 0.25 0.50 0.40 0.50 0.90 3.1 0 3.10 c reference land pattern layout (reference ipc7351 qfn50p300x300x80-17w2m); all pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary to meet application process requirements and pcb layout tolerances; when mounting on a multilayer pcb, thermal vias at the exposed thermal pad land can improve thermal dissipation (reference eia/jedec standard jesd51-5) pcb layout reference view terminal #1 mark area exposed thermal pad (reference only, terminal #1 identi?er appearance at supplier discretion) dual dmos full-bridge motor driver a3916 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
10 figure 3: 20-contact 4 mm 4 mm qfn package (suffx es, -1) for reference only ? not for tooling use (reference jedec mo-220wggd) dimensions in millimeters ? not to scale exact case and lead con?guration at supplier discretion within limits shown 0.95 c seating plane c 0.08 21x 20 20 2 1 1 2 20 2 1 a a b c d d c 4.00 2.45 4.00 2.45 4.10 0.30 0.50 4.10 0.75 0.50 0.40 0.25 2.45 2.45 b pcb layout reference view terminal #1 mark area exposed thermal pad (reference only, terminal #1 identi?er appearance at supplier discretion) reference land pattern layout (reference ipc7351 qfn50p400x400x80-21bm); all pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary to meet application process requirements and pcb layout tolerances; when mounting on a multilayer pcb, thermal vias at the exposed thermal pad land can improve thermal dissipatio n (reference eia/jedec standard jesd51-5) coplanarity includes exposed thermal pad and terminals dual dmos full-bridge motor driver a3916 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
11 for the latest version of this document, visit our website: www.allegromicro.com revision history number date description C september 21, 2016 initial release 1 october 6, 2016 updated features and benefits (page 1); corrected selection guide (page 2) copyright ?2016, allegro microsystems, llc allegro microsystems, llc reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. before placing an order, the user is cautioned to verify that the information being relied upon is current. allegros products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of allegros product can reasonably be expected to cause bodily harm. the information included herein is believed to be accurate and reliable. however, allegro microsystems, llc assumes no responsibility for its use; nor for any infringement of patents or other rights of third parties which may result from its use. dual dmos full-bridge motor driver a3916 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com

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