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Monolithic Power Systems Inc. MP6500LGU-Z
- Part No.:
- MP6500LGU-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- Motor Drivers, Controllers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
MP6500LGU-Z.pdf
- Description:
- 35V, 2.5A STEPPER MOTOR DRIVER W
- Quantity:
- Payment:
- Shipping:
Inventory:4,479
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Product details
Overview
MP6500LGU-Z from Monolithic Power Systems is a bipolar stepper motor driver IC with integrated current sensing, translator logic, and dual full-bridge power stages. 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 integrates OCP/OVP/UVLO/thermal shutdown protection. It targets compact motion control in printers, CNC stages, and automated lab equipment.
For engineers reviewing the MP6500LGU-Z datasheet, MP6500LGU-Z pinout, MP6500LGU-Z application, or MP6500LGU-Z equivalent, key selection criteria include internal current sense elimination of external shunts, QFN-24 thermal performance at 2.5A, ROSC-programmable constant-off-time PWM, automatic decay mode behavior, and nFAULT open-drain fault reporting timing under OCP/OVP conditions.
Technical Context
The MP6500LGU-Z implements a dual-N-channel H-bridge architecture with integrated current-sense amplifiers and a digital translator that sequences phase currents based on STEP/DIR/MS1/MS2 inputs. Its constant-off-time (COT) PWM regulation uses an external ROSC resistor to set tOFF (19–26 µs typical), while ISET resistor sets peak current (e.g., 1.0A at RISET = 71 kΩ).
It employs automatic decay mode: slow decay initiates each off-cycle, and fast decay engages only if winding current remains above ITRIP at tOFF completion. Blanking time (2 µs) prevents false OCP triggering during MOSFET switching transients, and internal pull-downs on DIR/ENBL/MS1/MS2/NSLEEP simplify default-state logic design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5V to 35V - Supports wide-input industrial and automotive auxiliary rails without external regulators. |
| Max Output Current | ±2.5A per phase - Sustained output limited by PCB copper area, thermal vias, and ambient temperature (TJ ≤ 125°C). |
| On-Resistance (HS-FET) | 195 mΩ typ. at 25°C - Reduces conduction loss and self-heating in high-current microstepping modes. |
| Step Resolution | Full / Half / Quarter / Eighth - Enables precise positioning (e.g., 32 steps/elec. cycle) without external indexer hardware. |
| Current Regulation Accuracy | ±5% at 71–100% ITRIP - Ensures consistent torque across microstep positions under varying load and temperature. |
| Fault Reporting | nFAULT open-drain output - Asserts low on OCP/OVP/OTP/UVLO; requires external pull-up for system-level fault logging. |
| Thermal Resistance θJA | 36 °C/W - Validated on 4-layer JEDEC PCB; dictates minimum copper area and via count for 2.5A continuous operation. |
Pinout & Package
MP6500LGU-Z is housed in a thermally enhanced QFN-24 package (5mm × 5mm, 0.5mm pitch) with exposed thermal pad (EP) connected to GND for optimal heat dissipation. The package complies with JEDEC MO-220 and MSL Level 2 moisture sensitivity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 DIR | Direction control input | Internal 500 kΩ pull-down; rising/falling edge sets rotation direction before next STEP pulse. |
| 2 nFAULT | Fault indicator output | Open-drain; driven low on OCP/OVP/OTP/UVLO; requires external 4.7kΩ pull-up to VLOGIC. |
| 3 ISET | Current programming node | Resistor to GND sets full-scale IPEAK; 0.9 V reference enables accurate DAC-based microstep current scaling. |
| 5 ROSC | Constant-off-time timing | Resistor to GND programs tOFF (19–26 µs); determines PWM frequency and current ripple magnitude. |
| 6 MS2 / 7 MS1 | Microstep mode select | Binary-encoded inputs (L/L = full, H/H = eighth); internal pull-downs ensure safe default (full-step) on power-up. |
| 13 STEP | Step clock input | Rising-edge triggered; min. 1 µs pulse width; 200 ns setup/hold relative to MSx/DIR ensures deterministic sequencing. |
| 14 VCP / 15 CP2 / 16 CP1 / 17 VG | Charge pump & gate drive | VCP outputs charge-pump voltage; CP1/CP2 form flying capacitor network; VG supplies LS-FET gate drive bias. |
| 18 ENBL / 19 nSLEEP | Functional enable controls | ENBL disables bridges only; nSLEEP powers down entire IC including charge pump - reduces ISLEEP to 1 µA. |
| 9/11 BOUT1/BOUT2 21/23 AOUT1/AOUT2 |
Bridge output terminals | Direct connection to stepper motor windings A and B; require local 100nF ceramic decoupling at each pair. |
| 10/22 VIN | Main power input | Dual pins reduce IR drop; must be decoupled with ≥100nF ceramic + bulk capacitor near package edge. |
| 4/8/12/20/24/EP AGND/GND | Analog & power ground | Separate AGND pin minimizes noise coupling into current-sense circuitry; EP must be soldered to solid GND plane. |
Key Features
| Feature | Design Value |
|---|---|
| No external current sense resistors | Reduces BOM count and board space; eliminates shunt power loss and layout sensitivity in high-current paths. |
| Automatic decay mode selection | Eliminates manual decay mode configuration; dynamically switches between slow/fast decay to maintain current regulation accuracy across speed and load. |
| Integrated translator logic | Removes need for external microcontroller GPIO sequencing; STEP/DIR/MSx interface directly drives full/half/quarter/eighth-step waveforms. |
| Comprehensive protection suite | OCP (6 A trip), OVP (37.5 V), UVLO (3.6 V rise), and thermal shutdown (165 °C) prevent damage during fault events without external supervision. |
| 3.3 V / 5 V logic compatible | Accepts standard MCU I/O voltages without level shifters; VIH = 2.1 V min ensures robust noise margin in noisy industrial environments. |
Applications
| Printer Paper Feed Mechanism | Lab Automation XYZ Stage |
|---|---|
|
Use Scenario: Precise paper advancement and registration in inkjet/laser printers with variable media thickness. IC Role / Device Role / Timing Role: Bipolar stepper driver controlling 2-phase NEMA17 motor; translates STEP pulses into sinusoidal current profiles for smooth low-speed motion. Use Value: Eighth-step resolution (32 microsteps/elec. cycle) enables ±12.5 µm positioning accuracy at 1.8° motor step angle, reducing vibration-induced smearing. |
Use Scenario: High-repeatability sample positioning in automated pipetting or microscopy stages. IC Role / Device Role / Timing Role: Dual-bridge motor controller managing independent X/Y/Z axes; nFAULT signals axis-specific overcurrent to host MCU for immediate stop-and-recover. Use Value: Internal current sense and automatic decay maintain ±3% current regulation across 0–1 kHz STEP rates, ensuring consistent force and positional stability. |
| CNC Milling Tool Changer | Medical Infusion Pump Drive |
|
Use Scenario: Indexing rotary tool turret with precise angular alignment and stall detection. IC Role / Device Role / Timing Role: Stepper driver operating in quarter-step mode; ROSC-tuned tOFF optimizes torque at 200 RPM while minimizing audible noise. Use Value: 2.5A continuous rating and 195 mΩ HS-FET RDS(on) deliver >92% efficiency at rated load, reducing heatsink requirements in enclosed enclosures. |
Use Scenario: Silent, low-vibration syringe actuation in portable infusion pumps requiring FDA-grade reliability. IC Role / Device Role / Timing Role: Safety-critical motor interface with redundant fault reporting via nFAULT and thermal shutdown at 165 °C junction limit. Use Value: OVP (37.5 V) and UVLO (3.6 V) protect against power supply faults; RoHS/lead-free/halogen-free construction meets medical regulatory requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bipolar stepper motor driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TB6600HG | External current sense resistors required; higher RDS(on) (0.4 Ω HS); no integrated translator - needs external step sequencer. | Requires additional MCU GPIO or dedicated indexer IC; less suitable for space-constrained designs. | Choose when legacy design reuse or lower cost per unit outweighs board space and component count savings. |
| DRV8825 | Lower max voltage (45 V vs. 35 V); same QFN-24 package; includes adjustable decay mode but no OVP protection. | Lacks input overvoltage lockout - unsuitable for unregulated 36 V industrial rails where transient spikes exceed 38.5 V. | Prefer for battery-powered or regulated 24 V systems where OVP is not required and higher voltage headroom is unnecessary. |
Compared with TB6600HG and DRV8825, MP6500LGU-Z uniquely combines internal current sensing, integrated translator, and comprehensive protection (OVP/OCP/UVLO/OTP) in a single QFN-24 package - reducing system-level complexity and improving fault resilience in industrial motion control.
Availability
MP6500LGU-Z is available at Aetrix Electronics and suitable for printer mechanics, lab automation stages, CNC tool changers, and medical infusion pump drives requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MP6500LGU-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 power management ICs, including DC/DC converters, LED drivers, motor drivers, and battery management solutions.
The MP6500L product line delivers highly integrated stepper motor drivers targeting space-constrained, cost-sensitive motion control applications - emphasizing internal current sensing, microstepping flexibility, and robust protection for industrial and medical end equipment.
FAQ
What is the maximum continuous output current capability of MP6500LGU-Z?
The MP6500LGU-Z supports up to ±2.5A per phase under proper thermal conditions: 4-layer PCB with ≥6 thermal vias under the EP pad, ≥2 oz copper, and ambient temperature ≤40°C. Derating applies above 25°C ambient - consult the θJA = 36 °C/W curve and thermal shutdown threshold (165°C) to determine safe continuous current for your layout.
How does the internal current sensing work without external resistors?
MP6500LGU-Z uses integrated MOSFET current mirrors and precision amplifiers to measure channel current directly through the internal HS-FETs. This eliminates external shunt resistors, reducing power loss, board area, and layout sensitivity - while maintaining ±5% regulation accuracy across temperature and load.
Can MP6500LGU-Z operate with a 3.3 V logic supply?
Yes - all digital inputs (STEP, DIR, ENBL, MS1, MS2, nSLEEP) accept 3.3 V logic levels. VIH is specified at 2.1 V min, providing >1.2 V noise margin. The device also supports 5 V logic, and its internal LDO generates clean gate-drive bias from VIN, eliminating need for separate logic rail.
What happens during an over-current event, and how is it cleared?
When OCP triggers (≥6 A sensed for >1 µs), all H-bridge MOSFETs disable and nFAULT pulls low. Recovery requires either cycling VIN power or toggling nSLEEP from low to high - the latter resets internal state after ~1 ms stabilization delay before accepting new STEP commands.
Is the QFN-24 package lead-free and RoHS compliant?
Yes - MP6500LGU-Z is fully lead-free, halogen-free, and compliant with EU RoHS Directive 2011/65/EU. MPS confirms green status on its official quality assurance portal, and the device carries no exemptions for lead or brominated flame retardants.
How is microstepping resolution selected, and what are the electrical step counts?
MS1 and MS2 pins configure microstepping: L/L = full-step (4 steps/elec. cycle), L/H = half-step (8), H/L = quarter-step (16), H/H = eighth-step (32). Each mode uses precise DAC-driven current profiles - Table 2 and Figure 6–9 in the datasheet show exact %ITRIP values per step position for DIR = 0 or 1.
Does MP6500LGU-Z require external capacitors, and what are their critical values?
Yes - four mandatory ceramics: 100 nF (X7R) from each VIN pin to GND; 1 µF (16 V, X7R) from VCP to VIN; 100 nF (X7R, VIN-rated) between CP1–CP2; and 220 nF (16 V, X7R) from VG to GND. These stabilize charge pump, gate drive, and current regulation - omitting any risks erratic switching or thermal runaway.
MP6500LGU-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- MP
- Package/Case:
- 24-VFQFN 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:
- On/Off, PWM, Step/Direction
- Technology:
- NMOS
- Step Resolution:
- 1, 1/2, 1/4, 1/8
- Applications:
- Printer
- Current - Output:
- 2.5A
- Voltage - Supply:
- 4.5V ~ 35V
- Voltage - Load:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (5x5)
MP6500LGU-Z FAQ
1.How can I place an order for MP6500LGU-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP6500LGU-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 MP6500LGU-Z reliable?
The price and inventory of MP6500LGU-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP6500LGU-Z is usually 5 days.
3.What payment methods are accepted for MP6500LGU-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP6500LGU-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP6500LGU-Z?
MP6500LGU-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP6500LGU-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 MP6500LGU-Z?
For technical support, including MP6500LGU-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP6500LGU-Z requirements.
6.How does Aetrix verify that MP6500LGU-Z is sourced from the original manufacturer or authorized distributors?
All MP6500LGU-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 MP6500LGU-Z meets industry standards.
7.What is the process for return or replacement of MP6500LGU-Z?
All MP6500LGU-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP6500LGU-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 MP6500LGU-Z part is unused and in its original packaging.
Return procedure for MP6500LGU-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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