MP6508GF-Z

MP6508 2.7V-to-18V, 1.2A, Bipolar Stepper Motor Driver with Integrated MOSFETs DESCRIPTION FEATURES The MP6508 is a bipolar stepper-motor driver with dual, built-in full-bridges consisting of Nchannel power MOSFETs.     It operates from a supply voltage ranging from 2.7V to 18V and can deliver motor current up to 1.2A per channel. The Internal safety 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 MP6508 comes in both 16-pin, 5.0mmx6.4mm TSSOP-EP and 4mmx4mm QFN package with an exposed thermal pad on the backside.       Wide 2.7V to 18V Input Voltage Range Two Internal Full Bridge Drivers Low On Resistance(HS:250mΩ; LS:250mΩ) Internal Charger Pump for the High-Side Driver Low Quiescent Current:1.6mA Low Sleep Current: 1uA Over-Current Protection Thermal Shutdown and UVLO Protection Fault Indication Output Thermally-Enhanced Surface-Mount Package APPLICATIONS     POS Printers Video Security Camera 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 website under Quality Assurance. “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION BST VIN BST C2 0.1uF VDD C3 2.2uF C3 2.2uF VIN C1 10uF MP6508 AIN1 VIN AOUT1 Motor AIN2 AOUT2 BIN1 AOUT2 BIN1 SENA BIN2 SENA FAULT BOUT1 BOUT2 ON OFF BIN2 RSENA nSLEEP GND Fault FAULT BOUT1 Motor SENB Stepper Motor Application Motor BOUT2 ON OFF nSLEEP GND RSENB MP6508 Rev.1.0 6/27/2017 RSENA WindingA WindingB Fault C1 10uF MP6508 AIN1 AOUT1 AIN2 VIN C2 0.1uF VDD SENB RSENB Dual DC Motor Application www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 1 MP6508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER ORDERING INFORMATION Part Number MP6508GF* MP6508GR** Package TSSOP-16 EP QFN-16 (4mmx4mm) Top Marking See Belows See Belows * For Tape & Reel, add suffix –Z (e.g. MP6508GF–Z); **For Tape & Reel, add suffix –Z (e.g. MP6508GR–Z); TOP MARKING (MP6508GF) MPS: MPS prefix; YY: year code; WW: week code: MP6508: product code of MP6508GF; LLLLLL: lot number; TOP MARKING (MP6508GR) MPS: MPS prefix; Y: year code; WW: week code: MP6508: product code of MP6508GR; LLLLLL: lot number; MP6508 Rev.1.0 6/27/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 2 MP6508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER 4 BOUT2 5 MP6508 13 GND 12 VIN SENB 6 11 BST BOUT1 7 10 BIN2 FAULT 8 9 BIN1 EXPOSED PAD ON BACKSIDE CONNECTED TO GND AIN2 13 1 12 VDD AOUT2 2 11 GND BOUT2 3 10 VIN SENB 4 9 BST MP6508 EXPOSED PAD ON BACKSIDE CONNECTED TO GND TSSOP-16 EP 8 AOUT2 SENA BIN2 VDD AIN1 14 14 3 7 SENA BIN1 AIN2 nSLEEP 15 15 2 6 AOUT1 FAULT AIN1 AOUT1 16 5 1 BOUT1 nSLEEP 16 PACKAGE REFERENCE QFN-16 (4mm×4mm) ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance Supply Voltage VIN ......................... -0.3V to 20V AOUTx Voltage VAOUTx ...............-0.3V to VIN+1V BOUTx Voltage VBOUTx ...............-0.3V to VIN+1V BST Voltage VBST ....................-0.3V to VIN+6.5V Sense Voltage VSENx ..................... -0.3V to 0.5V All Other Pins ................................ -0.3V to 6.5V Junction Temperature .............................. 150°C Lead Temperature ................................... 260°C (2) Continuous Power Dissipation (TA = +25°C) QFN-16 (4mm×4mm).................................2.7W TSSOP-16 EP ...........................................2.8W Operating Temperature.............. -40°C to +85°C QFN-16(4mm×4mm) .............. 46 ...... 10 ... °C/W TSSOP-16 EP ........................ 45 ...... 10 ... °C/W Recommended Operating Conditions (3) (4) θJA θJC Notes: 1) Exceeding these ratings may damage the device. 2) The maximum allowable power dissipation is a function of the maximum junction temperature TJ (MAX), the junction-toambient thermal resistance θJA, and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by PD (MAX) = (TJ (MAX)-TA)/θJA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, 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. Supply Voltage VIN .......................... 2.7V to 18V Output Current IA/BOUT..................................1.2A Operating Junction Temp. (TJ). -40°C to +125°C MP6508 Rev.1.0 6/27/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 3 MP6508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER ELECTRICAL CHARACTERISTICS VIN=9V, TA=25°C, unless otherwise noted. Parameter Power Supply Input Supply Voltage Vdd Voltage Quiescent Current Symbol Condition VIN Vdd IIN IIN_SLEEP Min Typ Max Units 18 V V 1.8 mA 1 µA 250 350 mΩ 310 400 mΩ 2.7 4.85 nSLEEP=1, IOUT=0, Output disable nSLEEP=0, VIN=9V 1.6 Integrated MOSFETs RHS Output On Resistance RLS Body-Diode Forward Voltage Control Logic UVLO Threshold (Rising) UVLO Hysteresis Input Logic ‘Low’ Threshold Input Logic ‘High’ Threshold nSLEEP Logic, Low nSLEEP Logic, High VF VFAULT_L Fault Output Leakage Current Constant Off Time Propagation Delay Time (On) Propagation Delay Time (Off) ILEAK_FAULT TOFF TON_DELAY(HS) TON_DELAY(LS) TOFF_DELAY(HS) TOFF_DELAY(LS) 350 mΩ 400 mΩ 235 350 mΩ 310 400 mΩ 310 mΩ 400 mΩ IOUT=500mA VIN_RISE VHYS VIL VIH VSLEEP_L VSLEEP_H Fault Output Logic, Low MP6508 Rev.1.0 6/27/2017 IOUT=500mA, VIN=9V TJ=25°C IOUT=500mA, VIN=2.7V TJ=25°C IOUT=500mA, VIN=9V TJ=85°C IOUT=500mA, VIN=2.7V TJ=85°C IOUT=500mA, VIN=9V TJ=25°C IOUT=500mA, VIN=2.7V TJ=25°C IOUT=500mA, VIN=9V TJ=85°C IOUT=500mA, VIN=2.7V TJ=85°C 30 75 1 V 2.5 120 0.6 V mV V V V V 2 0.4 2 Flag triggered by OTP 1mA Current. VFAULT=5V 10mA Source Current 21 100 20 135 80 26 200 55 180 130 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 200 mV 1 µA 31 300 90 225 180 µs ns ns ns ns 4 MP6508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER ELECTRICAL CHARACTERISTICS (continued) VIN=9V, TA=25°C, unless otherwise noted. Parameter Symbol Cross Over Delay Sleep Mode Wakeup Time Min Typ Max Units 350 450 550 ns 275 355 435 ns 0.65 0.75 0.9 ms ATT1=L, ATT2=L 175 204 233 mV High Side Low Side 2 2.2 1.8 2.5 3.4 2.4 3 4.6 3 µs A A TDEG 0.75 1.1 1.45 µs TOCP 1.3 1.8 2.3 ms TCROSS TWAKE Condition LS off to HS on for one bridge arm HS off to LS on for one bridge arm Sleep active high to full bridge turn on (VBST=100nF) Protection Circuitry Current Limit Sense Trip Voltage Blanking Time Over-Current Trip Level Over-Current Deglitch Time Over-Current Protection Period Thermal Shutdown Thermal Shutdown Hysteresis MP6508 Rev.1.0 6/27/2017 VREF TBLANK IOCP1 IOCP2 165 °C 15 °C www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 5 MP6508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER TYPICAL CHARACTERISTICS MP6508 Rev.1.0 6/27/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 6 MP6508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER TYPICAL PERFORMANCE CHARACTERISTICS (continued) Performance waveforms are tested on the evaluation board of the Design Example section. VIN=12V, IOUT=1.2A, FSTEP=200Hz, R+L Load: L=2mH, R=3.3Ω, TA=25°C, unless otherwise noted. MP6508 Rev.1.0 6/27/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 7 MP6508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER PIN FUNCTIONS QFN16 Pin # TSSOP16 Pin # Name 1 2 3 4 SENA AOUT2 Channel A Sense. Connect to current sensor resistor for channel A. Connect to motor winding A. 3 4 5 6 7 8 9 5 6 7 8 9 10 11 BOUT2 SENB BOUT1 FAULT BIN1 BIN2 BST Connect to motor winding B. Channel B Sense. Connect to current sensor resistor for channel B. Connect to motor winding B. Logic low when in over-temperature fault condition. Gate signal input to control BOUT1. Gate signal input to control BOUT2. Charge Pump Output. Connect a 10nF-to-100nF ceramic capacitor to VIN 10 11 12 13 14 12 13 14 15 16 VIN GND VDD AIN2 AIN1 15 1 nSLEEP 16 2 AOUT1 MP6508 Rev.1.0 6/27/2017 Description Power Supply Input. Ranges from 2.7V to 18V. Ground Internal control and logic supply voltage. Gate signal input to control AOUT2. Gate signal input to control AOUT1. Sleep Logic Input. Logic low for sleep mode and logic high to enable the device Connect to motor winding A www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 8 MP6508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER BLOCK DIAGRAM VIN BST VIN VDD Charge Pump MP6508 LDO C3 2.2uF C2 0.1uF VIN C1 10uF AIN1 Gate Signal Input AIN2 BIN1 BIN2 AOUT1 Gate Driver AOUT2 OCP Control Logic VDD 10kΩ Fault OCP VREF SENA VIN RSENA WindingA Fault Report OCP OFF ON GND BOUT1 OCP BOUT2 VREF SENB WindingB Gate Driver nSLEEP Motor RSENB Figure 1: Function Block Diagram MP6508 Rev.1.0 6/27/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 9 MP6508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER OPERATION The MP6508 is a motor driver that integrates 8 N-channel power MOSFETs for dual, internal fullbridges with 1.2A output current capability over an input voltage range of 2.7V to 18V. It can drive a stepper motor, or two DC motors. The motor output current can be either controlled by an external pulse width modulator (PWM) or internal PWM current controller. The MP6508 includes the following fault protections: over-current protection(OCP), undervoltage lockout(UVLO) and over-temperature protection(OTP). In external PWM control mode, the winding’s inductive current ramps up when the high-side MOSFET is on and freewheels during the highside 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 3 for forward operation and Figure 4 for reverse operation. VIN 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, the BIN1 and BIN2 input pins control the state of the BOUT1 and BOUT2. AOUT2 AOUT1 Slow Decay Fast Decay Forward VIN Figure 3: Forward Operation AIN1 VIN AOUT1 Gate Driver AOUT2 WindingA AIN2 Motor VTRIP SENA RSENA AOUT1 AOUT2 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 L H H H L H MP6508 Rev.1.0 6/27/2017 High Impedance GND VIN GND High Impedance VIN GND GND Slow Decay Fast Decay Reverse Figure 4: 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 MP6508 for fast decay mode, apply the PWM signal to one input pin and keep www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 10 MP6508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER 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 5 for detailed waveforms. Table 2: PWM Control A/BIN1 H (PWM) L (PWM) L L H H L (PWM) H (PWM) A/BIN2 L L H (PWM) L (PWM) L (PWM) H (PWM) H H Mode Forward Fast Decay Reverse Fast Decay Forward Slow Decay Reverse Slow Decay comparator MOSFET. shuts off the high-side  The stepper motor’s inductance causes the current to freewheel through the two low-side MOSFETs (slow decay).  During this freewheeling time, the current decreases until the internal clock reaches its’ constant off time (typically 30µs). After that, the high-side MOSFET is enabled to increase the winding current again.  The cycle then repeats. Calculate the current limit as: ILIMIT  VREF RSENSE (1) A/B IN1 A/B IN1 0 A/B IN2 0 0 A/B IN2 IA/BOUT1 0 ILIMIT IA/BOUT1 0 0 Forward Reverse Fast Decay Forward Reverse Forward Slow Decay Reverse Slow Decay TBLANK Figure 5: External PWM Current Control Waveform Internal PWM Current Control For this control method, the motor current is regulated by an internal constant off-time PWM current control circuit as the following:  ILIMIT Constant off time TOFF Figure 6: Internal PWM Current Control Waveform Initially, a diagonal pair of MOSFETs turns on so current can flow through the motor winding. Sleep Mode  The current increases in the motor winding, which is sensed by an external sense resistor (RSENSE). During the initial blanking time TBLANK (3us), the high-side MOSFET always turns on in spite of current limit detection. 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  When the voltage across RSENSE reaches the internal reference voltage threshold VTRIP (200mV), the internal current MP6508 Rev.1.0 6/27/2017 The MP6508 provides low-power standby sleep mode. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 11 MP6508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER charge pump all shut down. Connect the nSLEEP pin to logic high to wake up the MP6508 from sleep mode, though there is a delay time of ~1ms until the internal circuitry stabilizes. Blanking Time There is usually a current spike during the switching transition due to the body diode’s reverse-recovery current or the distributed inductance or capacitance. This current spike requires filtering to prevent it from erroneously shutting down the high-side MOSFET. An internal blanking time TBLANK 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 inputs (AIN1, AIN2, BIN1 and BIN2) are logic low, the MP6508’s 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. The SR mode enables both two low-side MOSFETs, which feature a lower voltage drop and lower power dissipation during decay operation. MP6508 Rev.1.0 6/27/2017 Over-Current Protection The over-current protection circuit limits the current through the FET by disable the gate driver. If the over-current limit threshold is reached and lasts for longer than the overcurrent deglitch time, all MOSFETs in the Hbridge will be disabled and the nFAULT pin will be driven low. The driver will remain disabled and is reset to enable state after 2ms(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 overcurrent 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 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 MP6508 has UVLO protection. When the VIN exceeds the UVLO rising threshold, the MP6508 powers up. It shuts off when VIN drops below the UVLO falling threshold. www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 12 MP6508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER APPLICATION INFORMATION (6) Table 3 : Full-Step Drive Sequence Sequence 1 2 3 4 (Full Step) Driver Mode: The MP6508 could be configured for both fullstep 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 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. A + B + + + —— + A + —— + B + (6) Table 4 : Half-Step Drive Sequence Sequence 1 2 3 4 5 6 7 (Half Step) A B + + —— + + + + A Figure 7 shows the operating waveforms for both full and half step drives. + 8 + —— + + B + + Note: 5) A means +VIN between AOUT1 and AOUT2 for winding A, H AIN1 — while A means -VIN between AOUT1 and AOUT2. The same applies to winding B. L H 6) “+” item is the selected winding voltage. AIN2 L H BIN1 L H BIN2 L AOUT1-OUT2+VIN 0 -V IN +VIN BOUT1-OUT2 0 -V IN AB AB AB Full Step AB AB B AB A AB B AB A AB Half Step Figure 7 Signal Logic Sequences for Full-Step and Half-Step MP6508 Rev.1.0 6/27/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 13 MP6508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER PACKAGE INFORMATION QFN16 (4mm×4mm) 3.90 4.10 2.15 2.45 0.50 0.70 PIN 1 ID MARKING 0.25 0.35 3.90 4.10 PIN 1 ID INDEX AREA 13 PIN 1 ID SEE DETAIL A 16 1 12 2.15 2.45 0.65 BSC 9 4 8 TOP VIEW 5 BOTTOM VIEW PIN 1 ID OPTION A 0.45x45ºTYP. PIN 1 ID OPTION B R0.25 TYP. 0.80 1.00 0.20 REF 0.00 0.05 DETAIL A SIDE VIEW 3.80 2.30 1.00 0.35 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) JEDEC REFERENCE IS MO-220, VARIATION VGGC. 5) DRAWING IS NOT TO SCALE. 0.65 RECOMMENDED LAND PATTERN MP6508 Rev.1.0 6/27/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 14 MP6508 – 2.7V-TO-18V, 1.2A STEPPER MOTOR DRIVER PACKAGE INFORMATION TSSOP-16 EP PIN 1 ID TOP VIEW RECOMMENDED LAND PATTERN SEE DETAIL "A" FRONT VIEW SIDE VIEW DETAIL "A" NOTE: BOTTOM VIEW 1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH, PROTRUSION OR GATE BURR. 3) PACKAGE WITDH DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION. 4) LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.10 MILLIMETERS MAX. 5) DRAWING CONFORMS TO JEDEC MO-153, VARIATION ABT. 6) DRAWING IS NOT TO SCALE. 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. MP6508 Rev. 1.0 6/27/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved. 15