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Monolithic Power Systems Inc. MP6531AGR-Z
- Part No.:
- MP6531AGR-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Category:
- Motor Drivers, Controllers
- Package:
- 28-VFQFN Exposed Pad
- Datasheet:
-
MP6531AGR-Z.pdf
- Description:
- 5V - 60V, THREE-PHASE, BRUSHLESS
- Quantity:
- Payment:
- Shipping:
Inventory:4,903
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Product details
Overview
MP6531AGR-Z from Monolithic Power Systems is a three-phase BLDC motor pre-driver IC that controls six external N-channel MOSFETs in half-bridge configuration, supports 5V–60V input voltage, delivers 0.8A source / 1A sink gate drive per high-side output, and integrates bootstrap charge pump with trickle-charge for 100% duty-cycle operation - used in e-bike motor controllers and power tool drivers.
For engineers reviewing the MP6531AGR-Z datasheet, MP6531AGR-Z pinout, MP6531AGR-Z application, or MP6531AGR-Z equivalent, key selection criteria include adjustable dead-time control (0.13–5.7 µs), programmable over-current protection via LSS/OCREF, thermal shutdown at 190°C, and QFN-28 (4mm×4mm) thermally enhanced package with exposed pad.
Technical Context
The MP6531AGR-Z implements a three-phase gate driver architecture with independent high-side (GHA/GHB/GHC) and low-side (GLA/GLB/GLC) outputs, each driven by a regulated VREG-supplied stage (10–13V) and bootstrap circuitry. It uses internal VDS sensing and LSS shunt monitoring to detect short-circuit and over-current faults, latching off all outputs upon violation.
Dead time is set externally via resistor on DT pin (130 ns minimum to 5.7 µs max), while sleep mode is controlled by nSLEEP with 1 µA quiescent current and 1 ms wake-up latency. UVLO triggers at VIN < 3.3V (rising) with 250 mV hysteresis, and VREG regulation starts only after VIN exceeds threshold and stabilizes above 6.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 60V - powers gate drivers and logic; supports 24V/48V e-bike and power tool systems without external DC-DC. |
| Gate Drive Output | 0.8A source / 1A sink (HS), 2A sink (LS) - directly drives MOSFET gates with fast switching and robust shoot-through immunity. |
| VREG Output | 10V–13V @ VIN ≥ 5.5V - supplies stable low-side gate voltage even at low input, enabling reliable MOSFET turn-on down to 5V supply. |
| OCP Threshold | LSS voltage > 0.5V (typ.) - sets ~10A current limit with 50mΩ sense resistor; disables outputs and asserts nFAULT on violation. |
| Thermal Shutdown | 190°C junction temperature - protects die during overload or poor heatsinking; latches until nSLEEP or VIN UVLO reset. |
| Dead Time Range | 130 ns (DT grounded) to 5.7 µs (RDT = 100kΩ) - prevents shoot-through across all three phases using single resistor tuning. |
| Quiescent Current | 1 µA in sleep mode - enables battery-powered applications like cordless drills with multi-week standby life. |
Pinout & Package
MP6531AGR-Z is housed in a 4mm × 4mm QFN-28 package with exposed thermal pad (EP) on underside for PCB-level heat dissipation. Thermal resistance θJA = 42°C/W (4-layer board), θJC = 9°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–4, 9–10, 13–14, 17–28 | Power & Ground | VIN (1), CPA/CPB (2–3), VREG (4), BSTA/B/C (5,9,13), SHA/SHB/SHC (6,10,14), LSS (17), GND (28) - form charge pump, bootstrap, and return paths for gate drive loops. |
| 7, 8, 11, 12, 15, 16 | Gate Outputs | GHA/GLA (7–8), GHB/GLB (11–12), GHC/GLC (15–16) - drive external N-MOSFET gates with matched rise/fall timing and current capability. |
| 18–20, 21–23 | Logic Inputs | HA/HB/HC (18–20), LA/LB/LC (21–23) - accept TTL/CMOS-compatible signals to control phase commutation sequence. |
| 24–27 | Control & Fault | nFAULT (24), nSLEEP (25), OCREF (26), DT (27) - provide fault reporting, low-power entry, OCP reference, and dead-time programming. |
Key Features
| Feature | Design Value |
|---|---|
| Bootstrap Trickle-Charge Circuit | Maintains high-side gate voltage during 100% duty cycle by injecting ~5µA to compensate bootstrap capacitor leakage. |
| Programmable Over-Current Protection | Configurable via LSS shunt resistor and OCREF voltage; supports both VDS sensing and current-sense modes with 3µs deglitch. |
| Adjustable Dead-Time Control | Single external resistor (DT pin) sets identical dead time across all three phases - eliminates need for per-phase tuning. |
| Fault Indication Output | nFAULT open-drain signal pulls low on UVLO, thermal shutdown, OCP, or SCP - enables system-level fault logging and safe shutdown. |
| Low-Power Sleep Mode | Reduces supply current to 1 µA while disabling all gate outputs and logic; resumes full operation within 1 ms after nSLEEP assertion. |
Applications
| Power Tools | E-Bike Motor Controllers |
|---|---|
|
Use Scenario: Cordless impact driver requiring rapid torque response and thermal resilience during stall conditions. IC Role / Device Role / Timing Role: Pre-driver controlling six discrete N-MOSFETs in three-phase inverter bridge; manages PWM timing, dead time, and fault response. Use Value: Enables 48V battery operation with 60V headroom for regenerative spikes; 190°C thermal shutdown prevents MOSFET destruction during jamming. |
Use Scenario: Mid-drive e-bike controller managing 250W–500W permanent magnet synchronous motor (PMSM). IC Role / Device Role / Timing Role: Gate driver IC translating MCU-generated commutation signals into high-current gate pulses with precise dead-time enforcement. Use Value: Bootstrap trickle-charge sustains gate voltage during hill-climb duty cycles; LSS-based OCP protects against wheel lock or phase short. |
| Industrial BLDC Pumps | Automotive HVAC Blowers |
|
Use Scenario: 24V brushless coolant pump in industrial automation with continuous duty and ambient temperatures up to +85°C. IC Role / Device Role / Timing Role: Three-phase pre-driver interfacing between microcontroller and power stage; handles UVLO, thermal monitoring, and fault signaling. Use Value: 5V–60V input range accommodates wide battery or rail variation; QFN-28 EP package ensures stable thermal performance under sealed enclosure conditions. |
Use Scenario: 12V automotive HVAC blower motor requiring EMC-robust gate driving and fail-safe behavior. IC Role / Device Role / Timing Role: BLDC pre-driver providing isolated gate control, shoot-through prevention, and nFAULT reporting to vehicle ECU. Use Value: Adjustable dead time (0.13–5.7 µs) allows optimization for low-noise fan operation; 1 µA sleep current meets automotive static current budgets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar three-phase BLDC pre-driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STSPIN32F0A | Integrated 32-bit ARM Cortex-M0 MCU + gate driver; no external bootstrap components required; lower voltage max (45V). | Best for cost-sensitive, space-constrained designs needing embedded commutation logic - not suitable for >45V or discrete FET flexibility. | Select when firmware-defined control and compact BOM outweigh need for 60V rating or external MOSFET selection freedom. |
| Toshiba TB6605FTG | 60V-rated pre-driver with built-in 3.3V LDO; lacks trickle-charge circuit - limits duty cycle to <95%; higher quiescent current (2.5mA sleep). | Suitable for simpler BLDC systems where 100% duty cycle is unnecessary and integrated LDO reduces external regulators. | Choose if system already includes 3.3V rail or can tolerate reduced duty-cycle margin; avoid for e-bike regen or high-duty industrial pumps. |
Compared with STSPIN32F0A and TB6605FTG, MP6531AGR-Z uniquely combines 60V operation, true 100% duty-cycle support via trickle-charge, and ultra-low 1µA sleep current - making it optimal for high-voltage battery-powered BLDC systems demanding reliability and thermal headroom.
Availability
MP6531AGR-Z is available at Aetrix Electronics and suitable for e-bike motor controllers, cordless power tools, and industrial BLDC pumps requiring stable component supply, long-lifecycle assurance, and RoHS-compliant sourcing.
Supply support for MP6531AGR-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.
The MP6531A product line targets high-efficiency, high-reliability motor drive systems - specifically engineered for three-phase BLDC/PMSM pre-driver applications in portable, automotive, and industrial equipment.
FAQ
What is the maximum allowable input voltage for MP6531AGR-Z?
The absolute maximum input voltage (VIN) is 65V, but recommended operating range is 5V to 60V. Exceeding 60V risks violating safe operating area during transients, especially in regenerative braking scenarios. TVS clamping is advised for systems prone to voltage spikes.
How does the trickle-charge circuit enable 100% duty cycle operation?
The internal trickle-charge circuit injects ~5µA into each bootstrap capacitor during high-side conduction, compensating for leakage currents that would otherwise discharge the capacitor. This maintains sufficient gate voltage (≥10V) even when low-side FETs remain off indefinitely.
Can MP6531AGR-Z drive P-channel high-side MOSFETs?
No - MP6531AGR-Z is designed exclusively for N-channel high-side MOSFETs using bootstrap gate drive. Its architecture assumes low-side source connection to ground and high-side source tied to phase node, which is incompatible with P-channel configurations.
What is the purpose of the LSS pin and how is OCP configured?
LSS senses voltage drop across an external shunt resistor connected to low-side MOSFET sources. When LSS voltage exceeds 0.5V (typ.), OCP triggers. The current limit is set by Rsense = 0.5V / Ilimit; e.g., 50mΩ yields 10A trip point. OCP is disabled by grounding LSS.
Is the nFAULT output compatible with 3.3V microcontrollers?
Yes - nFAULT is an open-drain output with ≤0.5V low-level voltage at 5mA sink current. A 3.3V pull-up resistor (e.g., 10kΩ) ensures clean logic-low detection by 3.3V MCUs while maintaining compatibility with 5V systems.
Does MP6531AGR-Z require external bootstrap diodes?
No - the IC integrates internal bootstrap diodes (VF ≈ 0.9–1.4V at 10–100mA). External diodes are unnecessary and may interfere with trickle-charge operation. Only ceramic bootstrap capacitors (0.1–1µF, 25V+) are required per phase.
How is thermal performance affected by the QFN-28 exposed pad?
The exposed thermal pad reduces junction-to-case thermal resistance to 9°C/W. For optimal cooling, the pad must be soldered to a large copper pour with ≥4 thermal vias to inner/ground planes. Without proper pad connection, θJA degrades from 42°C/W to >60°C/W.
MP6531AGR-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 28-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Motor Type - Stepper:
- Multiphase
- Motor Type - AC, DC:
- Brushless DC (BLDC)
- Function:
- Controller - Speed
- Output Configuration:
- Pre-Driver - Half Bridge (3)
- Interface:
- -
- Technology:
- Power MOSFET
- Step Resolution:
- -
- Applications:
- General Purpose
- Current - Output:
- -
- Voltage - Supply:
- 5V ~ 60V
- Voltage - Load:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (4x4)
MP6531AGR-Z FAQ
1.How can I place an order for MP6531AGR-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP6531AGR-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 MP6531AGR-Z reliable?
The price and inventory of MP6531AGR-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP6531AGR-Z is usually 5 days.
3.What payment methods are accepted for MP6531AGR-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP6531AGR-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP6531AGR-Z?
MP6531AGR-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP6531AGR-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 MP6531AGR-Z?
For technical support, including MP6531AGR-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP6531AGR-Z requirements.
6.How does Aetrix verify that MP6531AGR-Z is sourced from the original manufacturer or authorized distributors?
All MP6531AGR-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 MP6531AGR-Z meets industry standards.
7.What is the process for return or replacement of MP6531AGR-Z?
All MP6531AGR-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP6531AGR-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 MP6531AGR-Z part is unused and in its original packaging.
Return procedure for MP6531AGR-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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