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approximate scale 1:1 cpu m m out1 in4 in3 a3901 +vbat out2 out3 out4 in2 in1 vbb gnd 10 f 10 v cpu m out1 in4 in3 a3901 +vbat out2 out3 out4 in2 in1 vbb gnd 10 f 10 v figure 2. t ypical dual dc motor control figure 3. t ypical single dc motor control (paralleled outputs) cpu m out1 in4 in3 a3901 +vbat out2 out3 out4 in2 in1 vbb gnd 10 f 10 v figure 1. t ypical stepper motor control a3901 description the a3901 is a dual full-bridge motor driver, designed for low voltage portable applications involving bipolar stepper or brush dc motors. the outputs have been optimized for low voltage drop, with currents up to 400 ma (800 ma with outputs paralleled) and an operating voltage range of 2.5 to 5.5 v. the four inputs (in1 to in4) can control a bipolar stepper motor in full- or half-step mode, or dc motors in forward, reverse, or brake mode. the inputs can be pwmed for current or speed control at frequencies up to 250 khz. internal protection circuitry includes thermal shut down (tsd) and crossover (shoot-through) protection. the a3901 is supplied in a 3 mm x 3 mm x 0.75 mm nominal height, 10-lead dfn package, with exposed thermal pad (package ?ej?). this small footprint package is lead (pb) free, with 100% matte tin leadframe plating. 3901-ds, rev. 5 features and benefits ? low r ds(on) outputs ? full- and half-stepping capability ? small package ? forward, reverse, and brake modes for dc motors ? sleep mode with zero current drain ? pwm control up to 250 khz ? crossover-current protection ? thermal shutdown (tsd) package: 10 contact dfn (suffix ej) typical application dual full bridge low voltage motor driver
2 dual full bridge low voltage motor driver a3901 2 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com parameter symbol conditions min. typ. max. units load supply voltage v bb ??7v output current per channel* i out ? ? 400 ma logic input voltage range v in ?0.3 ? 6 v junction temperature t j ? ? 150 c storage temperature range t stg ?55 ? 150 c operating temperature range t a ?20 ? 85 c *output current rating may be limited by duty cycle, ambient temperature, and heat sinking. under any set of conditions, do not exceed the specified current rating or a junction temperature of 150 ? c. selection guide part number packing a3901sejtr-t tape and reel, 1500 pieces/reel absolute maximum ratings
3 dual full bridge low voltage motor driver a3901 3 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com control logic and gate drive tsd in1 in2 in3 in4 vbb gnd out1 out2 bridge1 bridge2 out3 out4 pad 10 f 10 v functional block diagram 10 9 8 7 6 out1 out2 vbb pad out3 out4 1 2 3 4 5 in1 in2 gnd in3 in4 terminal diagram number name description 1 in1 logic input 1 2 in2 logic input 2 3 gnd ground terminal 4 in3 logic input 3 5 in4 logic input 4 6 out4 bridge2 output to load 7 out3 bridge2 output to load 8 vbb load supply terminal 9 out2 bridge1 output to load 10 out1 bridge1 output to load ? pad exposed pad for thermal dissipation; connect to gnd externally
4 dual full bridge low voltage motor driver a3901 4 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com electrical characteristics at t a =25c, and v bb = 2.5 to 5.5 v, unless noted otherwise characteristics symbol test conditions min. typ. max. units output on resistance r ds(on) source driver, v bb = 3 v, i out = 300 ma 1 1.8 2.2 source driver, v bb = 5 v, i out = 300 ma 1 1.2 1.4 sink driver, v bb = 3 v, i out = 300 ma 0.5 1.2 1.4 sink driver, v bb = 5 v, i out = 300 ma 0.5 0.8 1.0 clamp diode i = 300 ma ? ? 1.5 v motor supply current i bb all outputs pwmed at 20 khz ? 0.6 ? ma sleep mode, v bb = 3 v ? ? 100 na sleep mode, v bb = 5 v ? <50 500 na logic input voltage v in(1) v bb /2 ? ? v v in(0) ? ? 0.5 v logic input current i in(1) v in = 2.0 v ? <100 500 na i in(0) v in = 0.5 v ? 5 dual full bridge low voltage motor driver a3901 5 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com motor operation truth table inx 1 out1 2 out2 out3 out4 function stepper motor in1 in2 in3 in4 full stepping half-stepping 0 0 0 0 off off off off sleep mode sleep mode 1 0 1 0 h l h l step 1 step 1 0 0 1 0 off off h l ? step 2 0 1 1 0 l h h l step 2 step 3 0 1 0 0 l h off off ? step 4 0 1 0 1 l h l h step 3 step 5 0 0 0 1 off off l h ? step 6 1 0 0 1 h l l h step 4 step 7 1 0 0 0 h l off off ? step 8 dc motor (dual) in1 or in3 in2 or in4 0 0 off off off off hi-z (sleep mode)/coast 1 0 h l h l forward 0 1 l h l h reverse 1 1 l l l l brake dc motor (single, paralleled) in1 and in3 in2 and in4 0 0 off off off off hi-z (sleep mode)/coast 1 0 h l h l forward 0 1 l h l h reverse 1 1 l l l l brake dc motor (external pwm) in1 or in3 in2 or in4 1 0 0 0 h off l off h off l off forward fast decay 0 0 1 0 l off h off l off h off reverse fast decay 1 1 0 1 h l l l h l l l forward slow decay 0 1 1 1 l l h l l l h l reverse slow decay 1 0 = logic low, v inx < v in(0)(max) ; 1 = logic high, v inx > v in(1)(min) 2 h = voltage high, source driver on; l = voltage low, sink driver on
6 dual full bridge low voltage motor driver a3901 6 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com 0.50 1.00 1.50 2.50 2.00 3.00 3.50 4.00 0.50 1.00 1.50 2.50 2.00 3.00 3.50 4.00 2.5 3.0 3.5 4.0 4.5 5.0 2.5 3.0 3.5 4.0 4.5 5.0 100 150 200 250 300 350 400 0.50 1.00 1.50 2.00 2.50 3.50 3.00 0.50 1.00 1.50 2.00 2.50 3.50 3.00 100 150 200 250 300 350 400 output on resistance versus load supply voltage i out = 100 ma output on resistance versus load supply voltage i out = 300 ma output on resistance versus output current v bb = 3 v output on resistance versus output current v bb = 5 v r ds(on) ( ) r ds(on) ( ) v bb (v) v bb (v) i out (ma) i out (ma) r ds(on) ( ) r ds(on) ( ) source sink total source sink total source sink total source sink total characteristic performance
7 dual full bridge low voltage motor driver a3901 7 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com functional description device operation. the a3901 is a dual full-bridge low voltage motor driver capable of operating one stepper motor or up to two dc motors. mosfet output stages substantially reduce the voltage drop and the power dissipation of the outputs of the a3901 compared to typical drivers with bipolar transistors. internal circuit protection includes thermal shutdown with hysteresis, clamp diodes, and crossover current protection. the a3901 is designed for portable applications with a power-off (sleep mode) current of 50 na typical, and an operating voltage of 2.5 to 5.5 v. the a3901 logic inputs are 3 to 5 v logic compatible. output current can be regulated by pulse width modu- lating (pwm) the inputs. the full-bridge outputs can be paralleled for higher-current applications (see figure 6). in conditions where the logic supply voltage drops below 2.5 v, both the sink and the source r ds(on) will increase beyond the specified values. in extreme cases, no power will be delivered to the motor(s). however, the device will not be damaged. in stepping operation, the device can drive in either full- or half-step mode. the stepping mode is set by the signal pattern on the in x terminals, as shown in the stepping timing diagrams. external pwm. pulse width modulating the inputs allows the output current to be regulated. slow decay mode is achieved by holding one input high while pwming the other input. holding one input low and pwming the other input results in fast decay. see the external pwm diagram. sleep mode. pulling all inputs to 0.5 v or less, sends the a3901 into sleep mode, during which it draws 50 na typical. thermal shutdown. the a3901 will disable the outputs if the junction temperature reaches 165c. when thermal shutdown is entered, after the junction temperature drops 15c, the outputs will be re-en- abled. brake mode. when driving dc motors, the a3901 will go into brake mode (turn on both sink drivers) when all inputs, in x , are logic 1. there is no protec- tion during braking, so care must be taken to ensure that the peak current during braking does not exceed the absolute maximum current.
8 dual full bridge low voltage motor driver a3901 8 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com application information in1 in2 in3 in4 iout1-2 iout3-4 +v bb /r motor ?v bb /r motor 0 a +v bb /r motor ?v bb /r motor 0 a in1 in2 in3 in4 iout1-2 iout3-4 +v bb /r motor ?v bb /r motor 0 a +v bb /r motor ?v bb /r motor 0 a figure 4a. typical stepper motor control application figure 4c. half step mode timing chart in1 control logic/ gate drive tsd v b b in2 gnd in3 in4 out1 out2 out3 vbb out4 stepper mot or 10 f/10 v figure 4b. full step mode timing chart
9 dual full bridge low voltage motor driver a3901 9 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com dc mot or dc mot or vbb in1 control logic/ gate drive tsd v b b in2 gnd in3 in4 out1 out2 out3 out4 10 f/10 v in1 in2 gnd in3 in4 control logic/ gate drive tsd v b b out1 out2 out3 out4 10 f 10 v dc mot or vbb figure 5. typical dual dc motor control application. either in1 or in2 can be used to drive out1 and out2. either in3 or in4 can be used to drive out3 and out4. figure 6. typical single dc motor control (paralleled outputs)
10 dual full bridge low voltage motor driver a3901 10 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com figure 7. typical dual dc motor control application figure 8. external pwm current control in fast and slow decay modes in1/3 in2/4 iout1-2/3-4 0a coast brake reverse +v bb /r motor +(v bb ?v bemf )/r motor ?(v bb ?v bemf )/r motor ?v bb /r motor forward 0a in1/3 in2/4 iout1-2/3-4 +i reg ?i reg reverse/ fast decay reverse/ slow decay forward/ fast decay forward/ slow decay
11 dual full bridge low voltage motor driver a3901 11 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com package ej, 10-contact dfn 2.38 10 10 2 1 2 1 a a terminal #1 mark area b exposed thermal pad (reference only, terminal #1 identifier appearance at supplier discretion) all dimensions nominal, not for tooling use (reference jedec mo-229weed) dimensions in millimeters exact case and lead configuration at supplier discretion within limits shown c reference land pattern layout (reference ipc7351 son50p300x300x80-11weed3m); 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) b pcb layout reference view 1.65 2.38 0.30 1 10 0.50 0.85 3.10 c 1.65 3.00 3.00 0.75 0.25 0.50 0.40 c 0.08 11x d d coplanarity includes exposed thermal pad and terminals
12 dual full bridge low voltage motor driver a3901 12 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com copyright ?2005-2013, allegro microsystems, llc allegro microsystems, llc reserves the right to make, from time to time, such de par tures from the detail spec i fi ca tions a s may be required to permit improvements in the per for mance, reliability, or manufacturability of its products. before placing an order, the user is cautioned to verify that the information being relied upon is current. allegro?s 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 allegro?s product can reasonably be expected to cause bodily harm. the in for ma tion in clud ed herein is believed to be ac cu rate and reliable. how ev er, allegro microsystems, llc assumes no re spon si bil i ty for its use; nor for any in fringe ment of patents or other rights of third parties which may result from its use. for the latest version of this document, visit our website: www.allegromicro.com revision history revision revision date description of revision rev. 4 june 19, 2013 update r ds(on) specifications rev. 5 february 7, 2014 updated electrical characteristics and disclaimer statement

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