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mp 650 8 2.7v - to - 1 8 v, 1. 2 a, bipolar stepper motor driver with integrated mosfets mp 650 8 rev. 1.0 www.monolithicpower.com 1 6/27/2017 mps proprietary information. patent prote cted. unauthorized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. description the mp 650 8 is a bipolar stepper - motor driver with dual , built - in full - bridge s consisting of n - c hannel power mosfets . it operates from a supply voltage ranging from 2.7v to 18 v and can deliver motor current up to 1. 2 a per channel . the internal s afety features include over - current protection(ocp) , under - voltage lockout protection(uvlo) and thermal shutdown. a fault output flag is available to indicate ocp and thermal shutdown . the mp650 8 comes in both 16 - pin, 5.0mmx6.4mm tssop - ep and 4mmx4mm qfn p ackage with an exposed thermal pad on the backside. features ? wide 2.7v to 1 8 v i nput v oltage r ange ? two i nternal full bridge drivers ? low on resistance(hs:250m ; ls:250m ) ? i nternal c harger p ump for the h igh - s ide d river ? low q uiescent c urrent:1 . 6 ma ? low sleep c urrent : 1ua ? over - current protection ? thermal s hutdown and uvlo p rotection ? fault indication o utput ? thermally - enhanced surface - mount package applications ? pos p rinters ? v ideo s ecurity c amera ? digital still cameras ? battery powered toys all mps parts are lead - free, halogen free, and adhere to the rohs directive. for mps green status, please visit mps w ebsite under quality assurance. mps and the future of analog ic technology are registered trademarks of monolithic power sy stems, inc. typical application stepper motor application dual dc motor application m o t o r b s t v i n a o u t 1 a o u t 2 b o u t 1 b o u t 2 f a u l t v d d v i n m p 6 5 0 8 s e n a w i n d i n g a s e n b r s e n b c 1 c 2 c 3 o f f o n w i n d i n g b r s e n a g n d f a u l t b i n 2 a i n 1 a i n 2 b i n 1 0 . 1 u f 1 0 u f 2 . 2 u f n s l e e p m o t o r b s t v i n a o u t 1 a o u t 2 b o u t 1 b o u t 2 f a u l t v d d v i n m p 6 5 0 8 s e n a s e n b r s e n b c 1 c 2 c 3 o f f o n r s e n a g n d f a u l t b i n 2 a i n 1 a i n 2 b i n 1 0 . 1 u f 1 0 u f 2 . 2 u f n s l e e p m o t o r
mp 6 508 C 2.7v - to - 18v, 1. 2 a stepper motor driv er mp 650 8 rev. 1.0 www.monolithicpower.com 2 6/27/2017 mps proprietary information. patent prote cted. unauthorized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. ordering information part number package top marking mp 650 8gf * tssop - 16 ep see belows MP6508gr ** qfn - 16 (4 mm x4mm) see belows * for tape & reel, add suffix C z ( e. g. mp 6508gf C z) ; ** for tape & reel, add suffix C z (e.g. mp650 8 gr C z); top marking ( mp650 8gf ) mp s : mps prefix; y y : year code; ww: week code: MP6508 : product code of mp 6508gf ; lll lll : lot number; top marking ( mp650 8 g r ) mp s : mps prefix; y: year code; ww: week code: MP6508 : product code of mp 6508g r ; lll lll : lot number;
mp 6 508 C 2.7v - to - 18v, 1. 2 a stepper motor driv er mp 650 8 rev. 1.0 www.monolithicpower.com 3 6/27/2017 mps proprietary information. patent prote cted. unauthorized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. package reference tssop - 16 ep qfn - 16 ( 4 mm 4 mm ) absolute maximum rat ings (1) supply voltage v in ......................... - 0.3v to 20 v aoutx voltage v aoutx ............... - 0.3v to v in +1 v boutx voltage v boutx ............... - 0.3v to v in +1 v bst voltage v bst .................... - 0.3v to v in + 6.5 v sense voltage v senx ..................... - 0.3v to 0.5 v all other pins ................................ - 0.3v to 6.5 v junction temperature .............................. 150 c lead temperature ................................ ... 260 c continuous power dissipation (t a = + 25 c) (2) qfn - 16 ( 4 mm 4 mm ) ................................ . 2. 7 w tssop - 16 ep ................................ ........... 2. 8 w operating temperature .............. - 4 0 c to +85 c recommended operating conditions ( 3 ) supp ly voltage v in .......................... 2. 7 v to 1 8 v output current i a / b out ................................ .. 1. 2 a operating junction temp . (t j ). - 40 c to +125 c thermal resistance ( 4 ) ja jc qfn - 16( 4 mm 4 mm) .............. 46 ...... 1 0 ... c/w tssop - 16 ep ........................ 45 ...... 10 ... 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), t he junction - to - ambient thermal resistance ja , and the ambient temperature t a . the maximum allowable continuous power dissipation at any ambient temperature is calculated by p d (max) = (t j (max) - t a )/ ja . exceeding the maximum allowable power dissipation will cause excessive die tempera ture, and the regulator will go into thermal shutdown. internal thermal shutdown circuitry protects the device from permanent damage. 3) the device is not guaranteed to function outside of its operating conditions. 4) measured on jesd51 - 7, 4 - layer pcb. 1 a i n 2 n s l e e p s e n a a o u t 2 b o u t 2 s e n b b o u t 1 f a u l t a o u t 1 v i n b s t b i n 2 b i n 1 a i n 1 v d d g n d m p 6 5 0 8 2 3 4 5 6 7 8 1 6 1 5 1 4 1 3 1 2 1 1 1 0 9 e x p o s e d p a d o n b a c k s i d e c o n n e c t e d t o g n d s e n a a o u t 2 s e n b v i n g n d v d d b s t 1 2 3 4 5 6 7 8 1 6 1 5 1 4 1 3 1 2 1 1 1 0 9 b o u t 2 b o u t 1 f a u l t b i n 1 b i n 2 a i n 2 a i n 1 a o u t 1 n s l e e p e x p o s e d p a d o n b a c k s i d e c o n n e c t e d t o g n d m p 6 5 0 8
mp 6 508 C 2.7v - to - 18v, 1. 2 a stepper motor driv er mp 650 8 rev. 1.0 www.monolithicpower.com 4 6/27/2017 mps proprietary information. patent prote cted. unauthorized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. electr ical characteristics v in = 9 v , t a =25 c, unless otherwise noted. parameter symbol condition min typ max units power supply input supply voltage v in 2.7 1 8 v vdd voltage v dd 4.85 v quiescen t current i in nsleep = 1, i ou t =0, output disable 1.6 1 .8 ma i in _sleep nsleep = 0, v in = 9 v 1 a integrated mosfets output o n r esistance r hs i out =500ma, v in = 9 v t j =25 c 250 350 m i out =500ma, v in =2.7v t j =25 c 310 400 m i out =500ma, v in = 9 v t j =85 c 350 m i out =500ma, v in =2.7v t j =85 c 400 m r ls i out =500 ma, v in = 9 v t j =25 c 235 350 m i out =500ma, v in =2.7v t j =25 c 310 400 m i out =500ma, v in = 9 v t j =85 c 310 m i out =500ma, v in =2.7v t j =85 c 400 m body - diode forward voltage v f i out =5 00ma 1 v control logic uvlo threshold (rising) v in_rise 2 .5 v uvlo hysteresis v hys 30 75 120 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 constant off time t off 21 26 31 s propagation delay time (o n ) t on_delay (hs) 10ma source current 100 200 300 ns t on_delay (ls) 20 55 90 ns propagation delay time (off) t off _delay (hs) 135 180 225 ns t off_delay (ls) 8 0 130 180 ns
mp 6 508 C 2.7v - to - 18v, 1. 2 a stepper motor driv er mp 650 8 rev. 1.0 www.monolithicpower.com 5 6/27/2017 mps proprietary information. patent prote cted. unauthorized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. electrical character istics (continued) v in = 9 v , t a =25 c, unless otherwise noted. parameter symbol condition min typ max units cross o ver d elay t cross l s off to h s on for one bridge arm 350 4 50 55 0 ns hs off to ls on for one bridge arm 275 355 435 ns sleep mode wakeup time t wake sleep a ctive high to full b ridge t urn o n (v bst =100nf) 0.65 0.75 0.9 ms protection circuitry current limit sense trip voltage v ref att1=l, att2=l 175 204 233 mv blank ing time t blank 2 2.5 3 s over - current trip level i ocp1 high side 2.2 3.4 4.6 a i ocp2 low side 1.8 2.4 3 a over - current deglitch time t deg 0.75 1.1 1.45 s over - current protection period t ocp 1.3 1.8 2.3 ms thermal shutdown 165 c thermal sh utdown hysteresis 15 c
mp 6 508 C 2.7v - to - 18v, 1. 2 a stepper motor driv er mp 650 8 rev. 1.0 www.monolithicpower.com 6 6/27/2017 mps proprietary information. patent prote cted. unauthorized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. typical characterist ics
mp 6 508 C 2.7v - to - 18v, 1. 2 a stepper motor driv er mp 650 8 rev. 1.0 www.monolithicpower.com 7 6/27/2017 mps proprietary information. patent prote cted. unauthorized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. typical performance characteristics (continued) performance waveforms are tested on the evaluation board of the design example section . v in =12v, i out = 1.2a , f step =200hz, r+l load: l= 2m h, r=3.3 , t a = 25 c, unless otherwise noted.
mp 6 508 C 2.7v - to - 18v, 1. 2 a stepper motor driv er mp 650 8 rev. 1.0 www.monolithicpower.com 8 6/27/2017 mps proprietary information. patent prote cted. unauthorized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. pin functions qfn16 pin # tssop16 pin # name description 1 3 sena channel a sense. connect to current sensor resistor for channel a . 2 4 aout2 connect to motor winding a . 3 5 bout2 connect to motor winding b . 4 6 senb channel b sense. connect to current sensor resistor for channel b . 5 7 bout1 connect to motor winding b . 6 8 fault l ogic low when in over - temperature fault condition. 7 9 bin1 gate signal input to control bout1. 8 10 bin2 gate signal input to cont rol bout2. 9 11 bst charge pump output. connect a 10nf - to - 100nf ceramic capacitor to vin 10 12 vin power supply input . range s from 2.7 v to 1 8 v . 11 13 gnd ground 12 14 vdd internal control and l ogic supply voltage. 1 3 15 ain2 gate signal input to cont rol aout2. 14 16 ain1 gate signal input to control aout1. 1 5 1 nsleep sleep logic input . logic low for sleep mode and logic high to enable the device 16 2 aout1 connect to motor winding a
mp 6 508 C 2.7v - to - 18v, 1. 2 a stepper motor driv er mp 650 8 rev. 1.0 www.monolithicpower.com 9 6/27/2017 mps proprietary information. patent prote cted. unauthorized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. block diagram figure 1 : function block diagram g a t e d r i v e r g a t e d r i v e r c o n t r o l l o g i c f a u l t r e p o r t l d o m o t o r c h a r g e p u m p b s t v i n a o u t 1 a o u t 2 b o u t 1 b o u t 2 n s l e e p f a u l t a i n 1 a i n 2 b i n 1 b i n 2 v d d v i n v i n g a t e s i g n a l i n p u t v i n s e n a w i n d i n g a g n d s e n b r s e n b c 1 c 2 c 3 o f f o n w i n d i n g b r s e n a 0 . 1 u f 1 0 u f 2 . 2 u f v d d 1 0 k o c p o c p v r e f o c p o c p m p 6 5 0 8 v r e f
mp 6 508 C 2.7v - to - 18v, 1. 2 a stepper motor driv er mp 650 8 rev. 1.0 www.monolithicpower.com 10 6/27/2017 mps proprietary information. patent prote cted. unauthorized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. operation the MP6508 is a motor driver that integrates 8 n - c hannel power mosfets for dual, internal full - bridges with 1. 2 a output current capability over an input voltage range of 2.7 v to 1 8 v. it can drive a steppe r motor, or two dc motors . the motor output current can be either controlled by an external pulse width modulator (pwm) or internal pwm current control ler . the mp 6508 includes the following fault protection s : over - current protection(ocp), u nder - voltage loc kout (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 e xternal pwm signals on the input pins ain1, ain2, bin1 and bin2. for phase a, t he ain1 an d ain2 input pins control the state of the aout1 and aout2; similarly for phase b, th e bin1 and bin2 input pins control the state of the bout1 and bout2 . figure 2 : full - bridge control circuit figure 2 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 in external pwm control mode , the winding s inductive current ramps up wh en 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 recirc ulation current: s low decay and fast decay, both of which are shown in figure 3 for forward operation and figure 4 for reverse operation . figu re 3 : forward operation figure 4 : reverse operation for slow decay mode, the current circulates through the two low - side mosfets. for fast decay mode, the current flow s through the body diodes of the other diagonal two mosfets. to configure the MP6508 for fast decay mode , apply the pwm signal to one input pin and keep g a t e d r i v e r m o t o r v i n a o u t 1 a o u t 2 a i n 1 a i n 2 s e n a w i n d i n g a r s e n a v t r i p v i n a o u t 1 a o u t 2 s l o w d e c a y f a s t d e c a y f o r w a r d v i n a o u t 1 a o u t 2 s l o w d e c a y f a s t d e c a y r e v e r s e
mp 6 508 C 2.7v - to - 18v, 1. 2 a stepper motor driv er mp 650 8 rev. 1.0 www.monolithicpower.com 11 6/27/2017 mps proprietary information. patent prote cted. unauthorized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. the other input pin low; for slow decay mode , apply the pwm signal to one input pin and keep the other input p in high . see table 2 for more configuration details and figur e 5 for detailed waveforms . 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 figure 5 : external pwm current control waveform interna l pwm current control for this control method, the motor current is regulated by an internal c onstant off - time pwm current control circuit as the following: ? initially, a diagonal pair of mosfets turns on so current can flow through the motor winding . ? the current increases in the motor winding , which is sensed by an external sense resistor (r sense ). during the initial blanking time t blank (3us), the high - side mosfet always turns on in spite of current limit detection. ? when the voltage across r sense reaches the internal reference voltage threshold v trip (200mv) , the internal current comparator shuts off the high - side mosfet. ? the stepper motors inductance causes the current to freewheel through the two low - sid e mosfets (slow decay). ? during this freewheel ing t ime , the current decreases until the internal clock reaches its constant off time (typically 30 s) . after that, the high - side mosfet is enabled to increase the winding current again . ? the cycle then repeats . calculate the current limit as: (1) figure 6 : internal pwm current control waveform sleep mode the MP6508 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 a / b i n 1 a / b i n 2 i a / b o u t 1 f o r w a r d r e v e r s e f o r w a r d r e v e r s e s l o w d e c a y f a s t d e c a y 0 0 0 ref limit sense v i r ? a / b i n 1 a / b i n 2 i a / b o u t 1 f o r w a r d r e v e r s e s l o w d e c a y i l i m i t c o n s t a n t o f f t i m e t o f f 0 0 0 t b l a n k i l i m i t
mp 6 508 C 2.7v - to - 18v, 1. 2 a stepper motor driv er mp 650 8 rev. 1.0 www.monolithicpower.com 12 6/27/2017 mps proprietary information. patent prote cted. unauthorized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. charge pump all shut down . connect the nsleep pin to logic high to wake up the MP6508 from sleep mode, though there is a del ay time of ~1ms until the internal circuitry stabilizes. blanking time there is usually a current spike during the switching transition due to the body diodes reverse - recovery current or the distributed inductance or capacitance . this current spike requir es filter ing to prevent it from erroneously shutting down the high - side mosfet . an internal blanking time t bl an k blanks the output of the current sense comparator when the outputs are switched, which is also the minimum on time for high - side mosfet. enable if all the input s (ain1, ain2, bin1 and bin2) are logic low, the MP6508s outputs are disabled while the charger pump and internal regulator remain active. synchronous rectifier the MP6508 enters a synchronous rectifier (sr) mode during the constant off - time period when the current limit threshold is exceeded , and the load current freewheels in slow decay sr mode. in slow decay mode , the current freewheels through one low - side mosfet and the body diode of the other low - side mosfet to short the winding . th e sr mode enables both two low - side mosfets, which feature a lower voltage drop and low er power d issipation during decay operation . over - current protection the over - current protection circuit limits the current through the fet by disable the gate drive r . if t he over - current limit threshold is reached and lasts for longer than the over - current deglitch time, all mos fets in the h - bridge will be disabled and the nfault pin will be driven low. the driver will remain disabled and is reset to enable state after 2 ms(typ). please note that only the h - bridge in which the ocp is detected will be disabled while the other bridge will operate normally. over - current conditions on both high and low side devices; i.e., a short to ground, supply, or across the motor winding will all result in an over - current shutdown. note that over - current protection does not use the current sense circuitry used for pwm current control, and is independent of the sense resistor value or vref voltage. thermal shutdown the junction temperature of the ic is internal ly monitored. if the junction temperature exceeds the threshold value ( t ypically 1 65 oc), the converter is shut down ( the fault pin goes low ) and recover ies o nce the junction temperature drops to about 1 50 oc (1 5oc hysteresis ) . uvlo pro tection the mp 6508 ha s uvlo protection . when the vin exceeds the uvlo rising threshold, the mp 6508 power s up. it shuts off when vin drops below the uvlo falling threshold .
mp 6 508 C 2.7v - to - 18v, 1. 2 a stepper motor driv er mp 650 8 rev. 1.0 www.monolithicpower.com 13 6/27/2017 mps proprietary information. patent prote cted. unauthorized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. application informat ion driver mode: the mp650 8 could be configured for both full - step and half - step mode s by sequentially energizing the two windings . full - step drive energizes two winding phases at any given time . the stator winding s are energize d as per the sequence shown in table 3 . there a re a total of four steps for one cycle in the sequence (5) : ab ? a b ? a b ? a b . half - step energizes the stator windings as per the sequence shown in table 4 . there are a total of eight steps for one cycle: ab ? b ? a b ? a ? a b ? b ? a b ? a. f igure 7 shows the operati ng waveforms for both full and half step drives . figure 7 s ignal logic sequences for full - step and half - s tep 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. ain 1 ain 2 bin 1 bin 2 h l h l h l h l a out 1 - out 2 b out 1 - out 2 + v in - v in 0 + v in - v in 0 ab ab ab b ab ab ab ab a b ab a ab full step half step
mp 6 508 C 2.7v - to - 18v, 1. 2 a stepper motor driv er mp 650 8 rev. 1.0 www.monolithicpower.com 14 6/27/2017 mps proprietary information. patent prote cted. unauthorized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. package information qfn 16 (4 mm 4 mm ) s i d e v i e w t o p v i e w 1 1 6 1 3 1 2 9 8 5 4 b o t t o m v i e w 3 . 9 0 4 . 1 0 2 . 1 5 2 . 4 5 3 . 9 0 4 . 1 0 2 . 1 5 2 . 4 5 0 . 6 5 b s c 0 . 2 5 0 . 3 5 0 . 8 0 1 . 0 0 0 . 0 0 0 . 0 5 0 . 2 0 r e f p i n 1 i d m a r k i n g 2 . 3 0 0 . 6 5 0 . 3 5 r e c o m m e n d e d l a n d p a t t e r n 3 . 8 0 n o t e : 1 ) a l l d i m e n s i o n s a r e i n m i l l i m e t e r s . 2 ) e x p o s e d p a d d l e s i z e d o e s n o t i n c l u d e m o l d f l a s h . 3 ) l e a d c o p l a n a r i t y s h a l l b e 0 . 1 0 m i l l i m e t e r m a x . 4 ) j e d e c r e f e r e n c e i s m o - 2 2 0 , v a r i a t i o n v g g c . 5 ) d r a w i n g i s n o t t o s c a l e . p i n 1 i d s e e d e t a i l a p i n 1 i d o p t i o n a 0 . 4 5 x 4 5 o t y p . p i n 1 i d o p t i o n b r 0 . 2 5 t y p . d e t a i l a p i n 1 i d i n d e x a r e a 1 . 0 0 0 . 5 0 0 . 7 0
mp 6 508 C 2.7v - to - 18v, 1. 2 a stepper motor driv er 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 i ntellectual p roperty r ights are not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. mp 650 8 rev. 1.0 www.monolithicpower.com 15 6/27/2017 mp s proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2017 mps . all rights reserved. package information tssop - 16 ep f r o n t v i e w s i d e v i e w b o t t o m v i e w d e t a i l " a " n o t e : 1 ) a l l d i m e n s i o n s a r e i n m i l l i m e t e r s . 2 ) p a c k a g e l e n g t h d o e s n o t i n c l u d e m o l d f l a s h , p r o t r u s i o n o r g a t e b u r r . 3 ) p a c k a g e w i t d h d o e s n o t i n c l u d e i n t e r l e a d f l a s h o r p r o t r u s i o n . 4 ) l e a d c o p l a n a r i t y ( b o t t o m o f l e a d s a f t e r f o r m i n g ) s h a l l b e 0 . 1 0 m i l l i m e t e r s m a x . 5 ) d r a w i n g c o n f o r m s t o j e d e c m o - 1 5 3 , v a r i a t i o n a b t . 6 ) d r a w i n g i s n o t t o s c a l e . p i n 1 i d t o p v i e w r e c o m m e n d e d l a n d p a t t e r n s e e d e t a i l " a "

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