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mp6506 2.7v-to-15v, 500ma, bipol ar stepper-motor driver with integrated mosfets mp6506 rev. 1.0 www.monolithicpower.com 1 5/22/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. the future of analog ic technology description the mp6506 is a bipolar stepper-motor driver with dual, built-in full-bridges consisting of n- channel power mosfets. it operates from a supply voltage range of 2.7v to 15v, and can deliver motor current up to 500ma per channel. the internal safety features include under-voltage lockout and thermal shutdown. an over-temperature output flag is available to indicate thermal shutdown. the mp6506 is available in a 3mm3mm qfn package with an exposed thermal pad on the back. features ? wide 2.7v-to-15v input voltage range ? two internal full-bridge drivers ? low mosfet on resistance (hs: 500m ? ; ls: 500 m ? ) ? internal charge pump for the high-side driver ? low quiescent current: 1.1ma ? low sleep current: 1 a ? thermal shutdown and under-voltage lockout protection ? over-temperature output flag ? thermally-enhanced surface-mount package applications ? pos printers ? video security camera ? digital still cameras ? battery powered toys a ll mps parts are lead-free and adhere to the rohs directive. for mps green status, please visit mps website under products, quality assurance page. ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. typical application stepper motor application dual dc motor application
mp6506 ?2.7v-to-15v, 500ma, stepper motor driver mp6506 rev. 1.0 www.monolithicpower.com 2 5/22/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. ordering information part number package top marking MP6506GQ * qfn16 (33mm) aju * for tape & reel, add suffix ?z (e.g. MP6506GQ?z); package reference qfn16 (33mm) absolute maximum ratings (1) supply voltage v in ......................... -0.3v to 18v aoutx voltage v aoutx ...............-0.3v to v in +1v boutx voltage v boutx ...............-0.3v to v in +1v bst voltage v bst .......................-0.3v to v in +7v all other pins ................................ -0.3v to 6.5v junction temper ature .............................. 150c lead temperat ure ................................... 260c continuous power dissipation (t a = +25c) (2) qfn16 (33mm) ........................................ 2.1w operating temperature .............. -40c to +85c recommended operating conditions (3) supply voltage v in .......................... 2.7v to 15v output current i a/bout .............................. 500ma operating junction temp. (t j ). -40c to +125c thermal resistance (4) ja jc qfn16(33mm) ..................... 60 ...... 12 ... c/w notes: 1) exceeding these ratings may damage the device. 2) the maximum allowable power dissipation is a function of the maximum junction temperature t j (max), the junction-to- ambient thermal resistance ja , and the ambient temperature t a . the maximum allowable continuous power dissipation a t any ambient temperature is calculated by p d (max) = (t j (max)-t a )/ ja . exceeding the maximum allowable powe r dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. internal thermal shutdown circuitry protects the device from permanen t damage. 3) the device is not guaranteed to function outside of its operating conditions. 4) measured on jesd51-7, 4-layer pcb.
mp6506 ?2.7v-to-15v, 500ma, stepper motor driver mp6506 rev. 1.0 www.monolithicpower.com 3 5/22/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. electrical characteristics v in =2.7v to 15v, t a = 25c, unless otherwise noted. paramete r symbol condition min type max units power supply input supply voltage v in 2.7 15 v quiescent current i in nsleep=1, i ou t =0, output disable 1.1 ma i in_sleep nsleep=0, v in =5v 1 a integrated mosfets output on resistance r hs i out =500ma, v in =5v t j =25c 460 m ? i out =500ma, v in =2.7v t j =25c 565 600 m ? i out =500ma, v in =5v t j =85c 570 m ? i out =500ma, v in =2.7v t j =85c 700 m ? r ls i out =500ma, v in =5v t j =25c 395 m ? i out =500ma, v in =2.7v t j =25c 515 600 m ? i out =500ma, v in =5v t j =85c 490 m ? i out =500ma, v in =2.7v t j =85c 650 m ? body-diode forward voltage v f i out =500ma 1 v control logic uvlo threshold (rising) v in rise 2.5 v uvlo hysteresis v hys 70 mv input logic ?low? threshold v il 0.6 v input logic ?high? threshold v ih 2 v nsleep logic, low v sleep l 0.4 v nsleep logic, high v sleep h 2 v fault output logic, low v fault_l flag triggered by otp 1ma current. 200 mv fault output leakage current i leak fault v fault =5v 1 a propagation delay time (on) t on_delay inx high to outx on 10ma source current 50 150 250 ns propagation delay time (off) t off delay inx low to outx off 50 150 250 ns
mp6506 ?2.7v-to-15v, 500ma, stepper motor driver mp6506 rev. 1.0 www.monolithicpower.com 4 5/22/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. electrical characteristics (continued) v in =2.7v to 15v, t a = 25c, unless otherwise noted. paramete r symbol condition min type max units cross over delay t cross hs off to ls on or ls off to hs on for one bridge arm 200 425 650 ns sleep mode wakeup time t wake sleep inactive high to full bridge turn on (v bst =100nf) 1.5 ms protection circuitry thermal shutdown 165 c thermal shutdown hysteresis 15 c
mp6506 ?2.7v-to-15v, 500ma, stepper motor driver mp6506 rev. 1.0 www.monolithicpower.com 5 5/22/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. typical characteristics
mp6506 ?2.7v-to-15v, 500ma, stepper motor driver mp6506 rev. 1.0 www.monolithicpower.com 6 5/22/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. typical performance characteristics (continued) performance waveforms are tested on the evaluation board of the design example section. i out =500ma, f step =100hz, t a =25c, unless otherwise noted. ain1 2v/div. aout1 10v/div. aout2 10v/div. iouta 500ma/div. ain1 2v/div. aout1 10v/div. aout2 10v/div. iouta 500ma/div. ain1 2v/div. aout1 10v/div. aout2 10v/div. iouta 500ma/div. ain1 2v/div. aout1 10v/div. aout2 10v/div. iouta 500ma/div. sleep 5v/div. aout1 5v/div. aout2 5v/div. iouta 500ma/div. sleep 5v/div. aout1 5v/div. aout2 5v/div. iouta 500ma/div. sleep 5v/div. aout1 5v/div. aout2 5v/div. iouta 500ma/div. sleep 5v/div. aout1 5v/div. aout2 5v/div. iouta 500ma/div. steady state-full step v in =15v steady state-half step v in =15v power ramp up-full step v in =15v power ramp up-half step v in =15v sleep entry-full step v in =9v sleep recovery-full step v in =9v sleep entry-half step v in =9v sleep recovery-half step v in =9v
mp6506 ?2.7v-to-15v, 500ma, stepper motor driver mp6506 rev. 1.0 www.monolithicpower.com 7 5/22/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. pin functions qfn16 pin # name description 1 pgnda channel a power ground. 2 aout2 connect to motor winding a. 3 bout2 connect to motor winding b. 4 pgndb channel b power ground. 5 bout1 connect to motor winding b. 6 fault logic low when in over-temperature fault condition. 7 bin1 gate signal input to control bout1. 8 bin2 gate signal input to control bout2. 9 bst charge pump output. connect a 10nf-to-100nf ceramic capacitor to vin. 10 vin power supply input. ranges from 2.7v to 15v. 11 gnd ground. 12 vdd internal control and logic supply voltage. 13 ain2 gate signal input to control aout2. 14 ain1 gate signal input to control aout1. 15 nsleep sleep logic input. logic low for sleep mode and logic high to enable the device. 16 aout1 connect to motor winding a.
mp6506 ?2.7v-to-15v, 500ma, stepper motor driver mp6506 rev. 1.0 www.monolithicpower.com 8 5/22/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. block diagram figure 1: function block diagram
mp6506 ?2.7v-to-15v, 500ma, stepper motor driver mp6506 rev. 1.0 www.monolithicpower.com 9 5/22/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. operation the mp6506 is a motor driver that integrates 8 n-channel power mosfets for dual, internal full- bridges with 500ma output current capability over an input voltage range of 2.7v to 15v. it can drive a stepper motor, or two dc motors. the motor output current can be controlled by an external pulse width modulator (pwm). the mp6506 includes the following fault protections: under-voltage lockout (uvlo) and over-temperature protection (otp). it also provides a low-power sleep mode. external pwm current control the motor current can be regulated by applying external pwm signals on the input pins ain1, ain2, bin1 and bin2. for phase a, the ain1 and ain2 input pins control the state of the aout1 and aout2; similarly for phase b, thee bin1 and bin2 input pins control the state of the bout1 and bout2. table 1 shows the input signal logic and bridge output state. table 1: full-bridge gate logic a/bin1 a/bin2 a/bout1 a/bout2 l l high impedance high impedance l h gnd vin h l vin gnd h h gnd gnd the winding?s inductive current ramps up when the high-side mosfet is on and freewheels during the high-side mosfet?s off time to cause the recirculation current. there are two modes for this recirculation current: slow decay and fast decay, both of which are shown in figure 2 for forward operation and figure 3 for reverse operation. figure 2: forward operation figure 3: reverse operation for slow decay mode, the current circulates through the two low-side mosfets. for fast decay mode, the current flows through the body diodes of the other diagonal two mosfets. to configure the mp6506 for fast decay mode, apply the pwm signal to one input pin and keep the other input pin low; for slow decay mode, apply the pwm signal to one input pin and keep the other input pin high. see table 2 for more configuration details and figure 4 for detailed waveforms.
mp6506 ?2.7v-to-15v, 500ma, stepper motor driver mp6506 rev. 1.0 www.monolithicpower.com 10 5/22/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. table 2: pwm control a/bin1 a/bin2 mode h (pwm) l forward l (pwm) l fast decay l h (pwm) reverse l l (pwm) fast decay h l (pwm) forward h h (pwm) slow decay l (pwm) h reverse h (pwm) h slow decay a/b in1 a/b in2 i a/bout1 forward reverse forward reverse slow decay fast decay 0 0 0 figure 4: external pwm current control waveform sleep mode the mp6506 provides low-power standby sleep mode. connect the nsleep pin to logic low to enable a low-power sleep state. in this state, the two full bridges are disabled and the internal circuits such as the gate drive, internal regulator, and charge pump all shut down. connect the nsleep pin to logic high to wake up the mp6506 from sleep mode, though there is a delay time of ~1ms until the internal circuitry stabilizes. enable if all the inputs (ain1, ain2, bin1 and bin2) are logic low, the mp6506?s outputs are disabled while the charger pump and internal regulator remain active. thermal shutdown the junction temperature of the ic is internally monitored. if the junction temperature exceeds the threshold value (typically 165oc), the converter is shut down (the fault pin goes low) and recoveries once the junction temperature drops to about 150oc (15oc hysteresis). uvlo protection the mp6506 has uvlo protection. when the vin exceeds the uvlo rising threshold, the mp6506 powers up. it shuts off when vin drops below the uvlo falling threshold.
mp6506 ?2.7v-to-15v, 500ma, stepper motor driver mp6506 rev. 1.0 www.monolithicpower.com 11 5/22/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. application information driver mode: the mp6506 could be configured for both full- step and half-step modes by sequentially energizing the two windings. full-step drive energizes two winding phases at any given time. the stator windings are energized as per the sequence shown in table 3. there are a total of four steps for one cycle in the sequence (5) : ab ? a ?? b ? a ?? b ?? ? ab ?? . half-step energizes the stator windings as per the sequence shown in table 4 there are a total of 8 steps for one cycle: ab ? b ? a ?? b ? a ?? ? a ?? b ?? ? b ?? ? ab ?? ? a. figure 5 shows the operating waveforms for both full and half step drives. figure 5: signal logic sequences for full-step and half-step table 3 (6 ): full-step drive sequence sequence (full step) 1 2 3 4 a + + b + + a ?? + + b ?? + + table 4 (6) : half-step drive sequence sequence (half step) 1 2 3 4 5 6 7 8 a + + + b +++ a ?? + + + b ?? + ++ note: 5) a means +vin between aout1 and aout2 for winding a, while a ? means -vin between aout1 and aout2. the same applies to winding b. 6) ?+? item is the selected winding voltage.
mp6506 ?2.7v-to-15v, 500ma, stepper motor driver mp6506 rev. 1.0 www.monolithicpower.com 12 5/22/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. pcb layout guide the printed circuit board (pcb) should use a heavy ground-plane. the mp6506 must be soldered directly onto the board for better electrical and thermal performance. the mp6506 uses an exposed pad, which provides a path for enhanced thermal dissipation. the thermal pad should be soldered directly to copper on the pcb. thermal vias are often used to transfer heat to other layers of the pcb. top layer bottom layer figure 7: pcb layout
mp6506 ?2.7v-to-15v, 500ma, stepper motor driver notice: the information in this document is subject to change without notice. please contact mps for current specifications. users should warrant and guarantee that third party intellectual property rights are not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. mp6506 rev. 1.0 www.monolithicpower.com 13 5/22/2014 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2014 mps. all rights reserved. package information qfn 16 (33mm) side view top view 1 16 13 12 9 8 5 4 bottom view 2.90 3.10 1.50 1.80 2.90 3.10 1.50 1.80 0.50 bsc 0.18 0.30 0.80 1.00 0.00 0.05 0.20 ref pin 1 id marking 1.70 0.50 0.25 recommended land pattern 2.90 note: 1) all dimensions are in millimeters. 2) exposed paddle size does not include mold flash. 3) lead coplanarity shall be 0.10 millimeter max. 4) drawing conforms to jedec mo-220, variation veed-4. 5) drawing is not to scale. pin 1 id see detail a pin 1 id option a 0.30x45 o typ. pin 1 id option b r0.20 typ. detail a pin 1 id index area 0.70 0.30 0.50

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