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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Motor Drivers, Controllers

Monolithic Power Systems Inc. MP6500GF-Z

Name: MP6500GF-Z
Brand: Monolithic Power Systems Inc.
SKU: MP6500GF-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP6500GF-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Motor Drivers, Controllers

Package:: 28-TSSOP (0.173", 4.40mm Width) Exposed Pad

Datasheet:: MP6500GF-Z.pdf

Description:: IC MTR DRV BIPLR 4.5-35V 28TSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MP6500GF-Z from Monolithic Power Systems is a bipolar stepper motor driver IC with integrated translator, internal current sensing, and dual full-bridge output stage. It operates from 4.5V to 35V, delivers up to 2.5A per phase (PCB/thermal dependent), supports full/half/quarter/eighth-step microstepping, and includes OCP, OVP, UVLO, and thermal shutdown. It targets compact motion control in printers and industrial automation.

For engineers reviewing the MP6500GF-Z datasheet, MP6500GF-Z pinout, MP6500GF-Z application, or MP6500GF-Z equivalent, key selection criteria include its internal current sense architecture, QFN-24/TSSOP-28 package options, 2.5A continuous drive capability, programmable constant off-time PWM regulation, and fault reporting via open-drain nFAULT.

Technical Context

The MP6500GF-Z integrates eight N-channel MOSFETs as two independent full-bridge drivers with HS on-resistance of 195mΩ and LS of 170mΩ at 25°C. Its translator accepts STEP/DIR/MS1/MS2 logic inputs to sequence winding currents without external microcontroller sequencing logic.

Current regulation uses programmable constant off-time PWM with external ROSC resistor setting t_OFF (20–26µs typical), while ISET resistor sets peak current (e.g., 1.0A at R_ISET = 71kΩ). Automatic decay mode dynamically switches between slow and fast decay based on real-time current crossing the trip threshold during fixed off-time intervals.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	4.5V to 35V - Enables direct operation from common industrial DC rails (e.g., 12V, 24V) without LDO pre-regulation.
Output Current	±2.5A per phase - Sustained drive for NEMA 17–23 bipolar stepper motors under optimized thermal layout.
Step Resolution	Full / Half / Quarter / Eighth - 4–32 steps per electrical cycle; enables precise positioning without external indexer.
HS/LS On-Resistance	195mΩ / 170mΩ at 25°C - Minimizes conduction loss and self-heating during high-current microstepping.
Fault Outputs	Open-drain nFAULT - Active-low reporting of OCP, OVP, UVLO, or thermal shutdown; requires external pull-up for system-level fault handling.
Logic Compatibility	3.3V and 5V - Direct interface with MCU GPIOs without level-shifting; internal pull-downs on DIR, STEP, MS1, MS2, nENBL, nSLEEP.
Thermal Protection	165°C shutdown with 15°C hysteresis - Prevents permanent die damage during overload or poor heatsinking; auto-recovery on cooldown.

Pinout & Package

MP6500GF-Z is packaged in thermally enhanced TSSOP-28 EP (exposed pad), offering higher power dissipation (3.9W at +25°C) than the QFN-24 variant. The exposed pad must be soldered to PCB ground plane for optimal thermal performance and EMI reduction.

Pin/Terminal	Circuit Role	Design Meaning
11 DIR	Direction control input	Internal 500kΩ pull-down; rising/falling edge sets motor rotation direction before next STEP pulse.
12 nFAULT	Fault status indicator	Open-drain output driven low during OCP/OVP/UVLO/thermal fault; requires external 4.7kΩ pull-up to logic rail.
13 ISET	Current regulation reference	Resistor to GND sets full-scale current (e.g., 71kΩ → 1.0A); accuracy ±5% at 71–100% range.
14 AGND	Analog ground reference	Separate analog ground pin minimizes noise coupling into current-sense circuitry; must connect to clean ground plane.
15 ROSC	Constant off-time programming	Resistor to GND sets PWM off-time (t_OFF ≈ 115 × R_OS ns); determines current regulation frequency and ripple.
16 MS2 / 18 MS1	Microstep mode selection	Binary pair selects step resolution: LL=full, LH=half, HL=quarter, HH=eighth; internal pull-downs default to full-step.
19 nENBL	Bridge enable control	Active-low; disables H-bridge outputs and translator when high; internal pull-down ensures safe power-on state.
20 nSLEEP	Low-power standby control	Active-low; halts charge pump and all logic; ~1ms wake-up delay required before first STEP command.
21–22 BOUT1/BOUT2	Bridge B output terminals	Drive one motor winding; rated for ±2.5A continuous; require low-inductance PCB traces and local 100nF ceramic decoupling.
23–24 AOUT1/AOUT2	Bridge A output terminals	Drive second motor winding; identical rating and layout requirements as BOUT pins.
8,10,21 VIN	Main power input	Three dedicated pins reduce IR drop and improve current sharing; each requires ≥100nF ceramic capacitor to AGND/GND.
14,28 GND	Power ground connections	Multiple GND pins (including EP) ensure low-impedance return path; EP must be soldered to solid ground plane.

Key Features

Feature	Design Value
No external current sense resistors	Reduces BOM count and board area; eliminates power loss and thermal drift associated with shunt resistors.
Programmable constant off-time PWM	Enables stable current regulation across wide voltage and motor inductance ranges using single ROSC resistor.
Automatic decay mode selection	Dynamically chooses slow/fast decay per PWM cycle based on real-time current vs. trip threshold-no configuration needed.
Integrated charge pump (VCP/CP1/CP2)	Generates gate drive voltage above VIN for N-channel high-side MOSFETs; eliminates need for external bootstrap circuitry.
Comprehensive protection suite	OCP (3.5–8.5A trip), OVP (36–38.5V), UVLO (3.4–4.5V), thermal shutdown (165°C)-all independently latched and reported via nFAULT.

Applications

Printer Motion Control

Industrial CNC Positioning

Use Scenario: Bidirectional paper feed and carriage movement in inkjet/laser printers requiring smooth acceleration and sub-millimeter repeatability.

IC Role / Device Role / Timing Role: Translator + dual full-bridge driver executing microstepped motion profiles directly from MCU STEP/DIR commands.

Use Value: Eliminates external indexer IC and sense resistors, reducing bill-of-materials cost by >15% and PCB area by 25% versus discrete solutions.

Use Scenario: Precision X/Y/Z axis actuation in desktop CNC mills and 3D printer extruders operating at 12–24V with NEMA 17 motors.

IC Role / Device Role / Timing Role: High-efficiency current-regulated H-bridge delivering 2.5A peak per phase with automatic decay optimization for low-vibration microstepping.

Use Value: Achieves <1.5% current regulation error across temperature (−40°C to +125°C), enabling consistent torque and reduced acoustic noise.

Medical Lab Automation

Smart Home Actuators

Use Scenario: Sample carousel indexing and reagent dispensing in automated analyzers where EMI immunity and fault resilience are critical.

IC Role / Device Role / Timing Role: Fault-aware stepper driver with open-drain nFAULT signaling over I²C-connected supervisor MCU for diagnostic logging.

Use Value: Integrated OVP/OCP/thermal protection prevents field failures due to power supply transients or blocked rotor conditions.

Use Scenario: Motorized window blinds, HVAC dampers, and smart lock actuators powered from 12V wall adapters or PoE-derived rails.

IC Role / Device Role / Timing Role: Low-quiescent (1.5mA active, 1µA sleep) stepper driver supporting battery-backed or energy-harvested operation.

Use Value: Sleep mode reduces system standby power to <5µW, extending battery life beyond 12 months in intermittent-use applications.

Equivalent & Alternatives

The following parts are listed as comparable options for similar stepper motor driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TB6600HG	Higher 4.5A rating but requires external current sense resistors and separate logic supply; larger HTSSOP-28 package.	Better suited for high-torque NEMA 23+ motors; less space-constrained designs with available board area for sense resistors.	Select when peak current >2.5A is mandatory and PCB layout allows for four 0805 shunts and additional decoupling.
DRV8825	2.2A max, integrated current sense, same microstep modes; smaller HTSSOP-28 but lower thermal dissipation (2.5W).	Optimized for low-cost consumer electronics; lacks OVP and has narrower 8.2–45V input range.	Prefer for cost-sensitive, non-industrial applications where 24V rail stability is guaranteed and fault coverage is secondary.

Compared with TB6600HG and DRV8825, MP6500GF-Z provides the best balance of integration (no sense resistors), protection breadth (OVP included), and thermal capability in TSSOP-28-making it ideal for space-constrained industrial motion systems requiring robustness and simplified layout.

Availability

MP6500GF-Z is available at Aetrix Electronics and suitable for printer motion control, industrial CNC positioning, medical lab automation, and smart home actuators requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP6500GF-Z includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance analog and power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP6500 product line delivers highly integrated stepper motor drivers targeting compact, cost-sensitive motion control applications-emphasizing internal current sensing, wide input voltage range, and comprehensive protection for reliable operation in unattended equipment.

FAQ

What is the maximum continuous output current for MP6500GF-Z?

The MP6500GF-Z supports up to ±2.5A per phase continuously, contingent on PCB thermal design-including copper area, layer count, and airflow. At +25°C ambient with 2oz copper and 4-layer board, derating begins above 2.0A without forced cooling. Absolute maximum peak current is 8.5A (OCP threshold), but sustained operation above 2.5A risks thermal shutdown.

Does MP6500GF-Z require an external microcontroller to generate STEP pulses?

No. The MP6500GF-Z contains an integrated translator that sequences motor phases autonomously upon receiving STEP pulses. A microcontroller only needs to provide timing-accurate STEP edges (min. 1µs high/low time) and set DIR/MS1/MS2 logic levels-no waveform generation or phase current calculation is required.

How is current regulation accuracy affected by temperature?

Current regulation maintains ±5% accuracy from −40°C to +105°C at 71–100% of full scale (e.g., R_ISET = 71kΩ). Below 34% full scale, accuracy degrades to ±12%, as specified in the Electrical Characteristics table. This is due to analog DAC and comparator offset drift-not a design limitation but a documented parameter boundary.

Can MP6500GF-Z drive unipolar stepper motors?

No. The MP6500GF-Z is designed exclusively for bipolar stepper motors with center-tapped or dual-winding configurations. Its dual full-bridge topology requires four independent output terminals (AOUT1/AOUT2/BOUT1/BOUT2) and cannot interface with the five- or six-wire unipolar motor wiring scheme.

What is the purpose of the VG pin and its required capacitor?

The VG pin supplies gate drive voltage to the low-side N-MOSFETs. A 220nF, 16V ceramic capacitor between VG and AGND stabilizes this internal rail during high-frequency switching, preventing gate drive collapse and ensuring consistent turn-on resistance. Omitting it causes erratic current regulation and potential OCP false triggers.

Is the nFAULT pin actively driven high during normal operation?

No. nFAULT is an open-drain output and remains in high-impedance state when no fault is present. An external pull-up resistor (typically 4.7kΩ to 3.3V or 5V) is mandatory to establish a defined logic-high level. Without it, the pin floats and cannot signal fault clearance reliably.

How does the automatic decay mode improve microstepping performance?

Automatic decay mode eliminates manual decay mode selection by dynamically switching between slow decay (for accurate current hold) and fast decay (to rapidly reduce current between steps). This maintains precise sinusoidal current waveforms across all microstep resolutions-reducing torque ripple and audible vibration without firmware tuning.

MP6500GF-Z Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 28-TSSOP (0.173", 4.40mm Width) Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Motor Type - Stepper:: Bipolar

Motor Type - AC, DC:: Brushed DC

Function:: Driver - Fully Integrated, Control and Power Stage

Output Configuration:: Half Bridge (4)

Interface:: Logic

Technology:: Power MOSFET

Step Resolution:: 1, 1/2, 1/4, 1/8

Applications:: Printer

Current - Output:: 2.5A

Voltage - Supply:: 4.5V ~ 35V

Voltage - Load:: 3.3V, 5V

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 28-TSSOP-EP

MP6500GF-Z FAQ

1.How can I place an order for MP6500GF-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MP6500GF-Z on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MP6500GF-Z reliable?

The price and inventory of MP6500GF-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP6500GF-Z is usually 5 days.

3.What payment methods are accepted for MP6500GF-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP6500GF-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP6500GF-Z?

MP6500GF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP6500GF-Z order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MP6500GF-Z?

For technical support, including MP6500GF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP6500GF-Z requirements.

6.How does Aetrix verify that MP6500GF-Z is sourced from the original manufacturer or authorized distributors?

All MP6500GF-Z products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MP6500GF-Z meets industry standards.

7.What is the process for return or replacement of MP6500GF-Z?

All MP6500GF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP6500GF-Z, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MP6500GF-Z part is unused and in its original packaging.

Return procedure for MP6500GF-Z:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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