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MP6500

35V, 2.5A, Stepper Motor Driver

MP6500 Rev. 1.0 www.MonolithicPower.com 1

6/22/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

DESCRIPTION

The MP6500 is a stepper motor driver with a

built-in translator and current regulation. Current

sensing is internal and requires no external

sense resistors. High integration and a small

package size make the MP6500 a space-saving

and cost-effective solution for bipolar stepper

motor drives.

The MP6500 operates from a supply voltage of

up to 35V and can deliver motor currents up to

2.5A (depending on PCB design and thermal

conditions). The MP6500 can operate a bipolar

stepper motor in full-, half-, quarter-, or eighth-

step modes. Internal safety features include

over-current protection (OCP), input over-

voltage protection (OVP), under-voltage lockout

(UVLO), and thermal shutdown.

The MP6500 is available in QFN-24

(5mmx5mm) and TSSOP-28 EP packages.

FEATURES

 Wide 4.5V to 35V Input Voltage Range

 Two Internal Full-Bridge Drivers

 Internal Current Sensing and Regulation

 Low On Resistance (HS: 195mΩ, LS:

170mΩ)

 No Control Power Supply Required

 Simple Logic Interface

 3.3V and 5V Compatible Logic Supply

 Step Modes from Full-Step to Eighth-Step

 2.5A Output Current

 Automatic Current Decay

 Over-Current Protection (OCP)

 Input Over-Voltage Protection (OVP)

 Thermal Shutdown and Under-Voltage

Lockout (UVLO) Protection

 Fault Indication Output

 Available in QFN-24 (5mmx5mm) and

Thermally Enhanced TSSOP-28 Packages

APPLICATIONS

 Bipolar Stepper Motors

 Printers

All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive.

For MPS green status, please visit the MPS website under Quality

Assurance. “MPS” and “The Future of Analog IC Technology” are registered

trademarks of Monolithic Power Systems, Inc.

TYPICAL APPLICATION

Step

Motor

CPA

CPB

VCP

VIN

AOUT1

AOUT2

BOUT1

BOUT2

ROSC

ISET

STEP

DIR

nENBL

MS1

MS2

nSLEEP

nFAULT

µC

VIN

MP6500

220

1µF

100nF

GND

Summary of content (19 pages)

PAGE 1
MP6500 35V, 2.5A, Stepper Motor Driver DESCRIPTION FEATURES The MP6500 is a stepper motor driver with a built-in translator and current regulation. Current sensing is internal and requires no external sense resistors. High integration and a small package size make the MP6500 a space-saving and cost-effective solution for bipolar stepper motor drives.     The MP6500 operates from a supply voltage of up to 35V and can deliver motor currents up to 2.5A (depending on PCB design and thermal conditions).
PAGE 2
MP6500 – 35V, 2.5A, STEP MOTOR DRIVER W/ INTERNAL CURRENT SENSE ORDERING INFORMATION Part Number* MP6500GF* MP6500GU** Package TSSOP-28 EP QFN-24 (5mmx5mm) Top Marking See Below See Below * For Tape & Reel, add suffix –Z (e.g. MP6500GF–Z) ** For Tape & Reel, add suffix –Z (e.g.
PAGE 3
MP6500 – 35V, 2.5A, STEP MOTOR DRIVER W/ INTERNAL CURRENT SENSE ABSOLUTE MAXIMUM RATINGS (1) Thermal Resistance (4) Supply voltage (VIN) ...................... -0.3V to 40V xOUTx voltage (VA/BOUT1/2) .............. -0.7V to 40V VCP, CPB .............................. VIN to VIN + 6.5V All other pins to AGND .................. -0.3V to 6.5V ESD rating (HBD) ........................................ 2kV Continuous power dissipation (TA = +25°C) (2) QFN .......................................................
PAGE 4
MP6500 – 35V, 2.5A, STEP MOTOR DRIVER W/ INTERNAL CURRENT SENSE ELECTRICAL CHARACTERISTICS VIN = 24V, TA = +25°C, unless otherwise noted. Parameter Power Supply Input supply voltage Quiescent current Symbol Condition VIN IQ ISLEEP Min Typ Max Units 4.5 24 35 V 1.5 5 mA 1 µA 0.
PAGE 5
MP6500 – 35V, 2.5A, STEP MOTOR DRIVER W/ INTERNAL CURRENT SENSE TIMING CHARACTERISTICS VIN = 24V, TA = +25°C, unless otherwise noted. Parameter STEP high time STEP low time Setup time MSx, DIR to STEP rising Hold time STEP rising to MSx, DIR change Symbol t1 t2 Condition Min 1 1 Typ Max Units µs µs t3 200 ns t4 200 ns 1 2 STEP MSx DIR VALID 3 MP6500 Rev. 1.0 6/22/2017 4 www.MonolithicPower.com MPS Proprietary Information. Patent Protected.
PAGE 6
MP6500 – 35V, 2.5A, STEP MOTOR DRIVER W/ INTERNAL CURRENT SENSE TYPICAL CHARACTERISTICS ISET Voltage vs. Temperature ISET Current Ratio vs. Temperature 12 ISET CURRENT RATIO (UA/A) 0.93 ISET VOLTAGE (V) 0.92 0.91 0.9 0.89 0.88 -50 -20 10 40 70 TEMPERATURE(OC) 100 11.9 11.8 11.7 11.6 11.5 11.4 -50 130 Bridge A HS On Resistance vs. Temperature 100 130 VIN = 24V, IOUT = 1A 280 280 260 260 ON RESISTANCE (mΩ) ON RESISTANCE(mΩ) 10 40 70 TEMPERATURE(oC) Bridge B HS On Resistance vs.
PAGE 7
MP6500 – 35V, 2.5A, STEP MOTOR DRIVER W/ INTERNAL CURRENT SENSE TYPICAL CHARACTERISTICS (continued) Input OVP Threshold vs. Temperature INPUT OVP THRESHOLD (V) 37.7 37.65 37.6 37.55 37.5 37.45 37.4 37.35 37.3 37.25 37.2 -50 MP6500 Rev. 1.0 6/22/2017 -20 10 40 70 100 TEMPERATURE (oC) 130 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved.
PAGE 8
MP6500 – 35V, 2.5A, STEP MOTOR DRIVER W/ INTERNAL CURRENT SENSE TYPICAL PERFORMANCE CHARACTERISTICS VIN = 24V, IOUT = 2.5A, FSTEP = 1kHz, TA = 25°C, resistor + inductor load: R = 3.3Ω, L = 1.5mH/channel, unless otherwise noted. Steady State, Full Step Steady State, Half Step IOUT = 2A CH1: STEP 2V/div. CH1: STEP 5V/div. CH2: AOUT1 20V/div. CH2: AOUT1 20V/div. CH3: AOUT2 20V/div. CH3: AOUT2 20V/div. CH4: IOUTA 2A/div. CH4: IOUTA 2A/div. 1ms/div. 2ms/div.
PAGE 9
MP6500 – 35V, 2.5A, STEP MOTOR DRIVER W/ INTERNAL CURRENT SENSE TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN = 24V, IOUT = 2.5A, FSTEP = 1kHz, TA = 25°C, resistor + inductor load: R = 3.3Ω, L = 1.5mH/channel, unless otherwise noted. Power Ramp-Up, Quarter Step Power Ramp-Up, Eighth Step CH1: VIN 20V/div. CH1: VIN 20V/div. CH2: AOUT1 20V/div. CH2: AOUT1 20V/div. CH3: AOUT2 20V/div. CH3: AOUT2 20V/div. CH4: IOUTA 2A/div CH4: IOUTA 2A/div 4ms/div. 10ms/div.
PAGE 10
MP6500 – 35V, 2.5A, STEP MOTOR DRIVER W/ INTERNAL CURRENT SENSE PIN FUNCTIONS Pin # QFN 1 Pin # TSSOP 11 2 12 nFAULT 3 13 ISET 4 14 AGND 5 15 ROSC 6 7 8, 12, 20, 24, EP 9 16 18 6, 10, 19, 23, EP 20 MS2 MS1 Direction input. DIR has an internal pull-down resistor. Fault indication. nFAULT is an open-drain output. Drive nFAULT to logic low when in a fault condition (OCP, OTP, OVP). Current set programming. A resistor from ISET to ground sets the current through the motor. Analog ground.
PAGE 11
MP6500 – 35V, 2.5A, STEP MOTOR DRIVER W/ INTERNAL CURRENT SENSE BLOCK DIAGRAM VIN MP6500 VIN VCP Charge Pump VG VREF Int. VCC LS Gate Drive V CPB UVLO OVP OTS Gate Driver AOUT1 nFAULT AOUT2 STEP µC Curr. Reg. DIR nENBL MS1 MS2 ISENSE VIN Control Logic nSLEEP ROSC VIN CPA BOUT1 Gate Driver PWM Timer Motor BOUT2 Curr. Reg. ISENSE ISET GND Figure 1: Functional Block Diagram MP6500 Rev. 1.0 6/22/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected.
PAGE 12
MP6500 – 35V, 2.5A, STEP MOTOR DRIVER W/ INTERNAL CURRENT SENSE OPERATION The MP6500 is a bipolar, stepper motor driver that integrates eight N-channel power MOSFETs arranged as two full-bridges with 2.5A of current capability each. The MP6500 operates over a wide 4.5V to 35V supply voltage range. The MP6500 is designed to operate bipolar stepper motors in full-, half-, quarter-, and eighthstep modes.
PAGE 13
MP6500 – 35V, 2.5A STEP MOTOR DRIVER W/ INTERNAL CURRENT SENSE Blanking Time There is usually a current spike during the switching transition due to the body diode’s reverse-recovery current and the distributed winding capacitance of the motor. This current spike requires filtering to prevent it from erroneously shutting down the HS-FET. After the PWM cycle begins, the output of the current sense comparator is ignored for the fixed blanking time.
PAGE 14
MP6500 – 35V, 2.5A STEP MOTOR DRIVER W/ INTERNAL CURRENT SENSE The nENBL pin is used to control the output drivers. When nENBL is low, the output H-bridge outputs are enabled, and the rising edges on STEP are recognized. When nENBL is high, the H-bridge outputs are disabled, and the STEP input is ignored. nENBL has an internal pulldown resistor. Fault Reporting The MP6500 provides an nFAULT pin, which reports if a fault condition (such as OCP, OTP, or OVP) occurs.
PAGE 15
MP6500 – 35V, 2.5A, STEP MOTOR DRIVER W/ INTERNAL CURRENT SENSE MICROSTEPPING Table 2: Relative Current Level Sequence Eighth Step # Quarter Step # Half Step # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 1 1 MP6500 Rev. 1.0 6/22/2017 Full Step # 2 3 2 1 4 5 3 6 7 4 2 8 9 5 10 11 6 3 12 13 7 14 15 16 8 4 Phase A Current %ITripLIMIT (%) Phase B Current %ITRIP -LIMIT (%) Step Angle (°) 100.00 98.08 92.39 83.15 70.71 55.56 38.27 19.51 0.
PAGE 16
MP6500 – 35V, 2.5A, STEP MOTOR DRIVER W/ INTERNAL CURRENT SENSE MICROSTEPPING (continued) Figure 5a: Full Step (4 Step Sequences) Figure 5b: Half Step (8 Step Sequences) MP6500 Rev. 1.0 6/22/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved.
PAGE 17
MP6500 – 35V, 2.5A, STEP MOTOR DRIVER W/ INTERNAL CURRENT SENSE MICROSTEPPING (continued) Figure 5c: Quarter Step (16 Step) Figure 5d: Eighth Step (32 Step) MP6500 Rev. 1.0 6/22/2017 www.MonolithicPower.com MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2017 MPS. All Rights Reserved.
PAGE 18
MP6500 – 35V, 2.5A, STEP MOTOR DRIVER W/ INTERNAL CURRENT SENSE PACKAGE INFORMATION QFN-24 (5mmx5mm) PIN 1 ID 0.30x45° TYP. PIN 1 ID MARKING PIN 1 ID INDEX AREA BOTTOM VIEW TOP VIEW SIDE VIEW NOTE: 1) ALL DIMENSIONS ARE IN MILLIMETERS. 2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH. 3) LEAD COPLANARITY SHALL BE 0.10 MILLIMETERS MAX. 4) DRAWING CONFIRMS TO JEDEC MO-220. 5) DRAWING IS NOT TO SCALE. RECOMMENDED LAND PATTERN MP6500 Rev. 1.0 6/22/2017 www.MonolithicPower.
PAGE 19
MP6500 – 35V, 2.5A, STEP MOTOR DRIVER W/ INTERNAL CURRENT SENSE PACKAGE INFORMATION (continued) PACKAGE OUTLINE DRAWING FOR 28-TSSOP w/ EXPOSED PADDLE TSSOP-28 EP MF-PO-D-0055 revision 2.0 6.00 TYP 9.60 9.80 0.65 BSC 0.40 TYP 28 15 1.60 TYP 4.30 4.50 PIN 1 ID 3.20 TYP 6.20 6.60 5.80 TYP 14 1 TOP VIEW RECOMMENDED LAND PATTERN 0.80 1.05 1.20 MAX SEATING PLANE 0.19 0.30 0.65 BSC 0.00 0.15 0.09 0.20 SEE DETAIL "A" FRONT VIEW SIDE VIEW GAUGE PLANE 0.25 BSC 5.40 5.90 0o-8o 0.45 0.