Monolithic Power Systems Inc. MP6532-GR-P

Overview

MP6532-GR-P from Monolithic Power Systems is a three-phase BLDC motor pre-driver IC designed to control six external N-channel MOSFETs in half-bridge configurations for 5V–60V motor supplies. It integrates 120° Hall-sensor commutation logic, charge-pump–boosted VREG (11.5V typ), bootstrap high-side drivers with trickle-charge support for 100% duty cycle, and programmable short-circuit/over-current protection. Used in power tools like impact drivers requiring robust gate drive and fault resilience.

For engineers reviewing the MP6532-GR-P datasheet, MP6532-GR-P pinout, MP6532-GR-P application, or MP6532-GR-P equivalent, key selection criteria include its 0.8A source / 1A sink gate drive capability, adjustable dead time (30ns–6µs), LSS-based current sensing threshold (0.5V typ), thermal shutdown at 150°C, and QFN-28 (4mm × 4mm) thermally enhanced package with exposed pad.

Technical Context

The MP6532 implements integrated 120° commutation using three internal pull-down Hall sensor inputs (HA/HB/HC), with automatic low-side turn-on pulse (1.8µs) before each commutation to refresh bootstrap capacitors. Its charge pump generates regulated VREG (10–12.8V) from VIN ≥5V, enabling full gate drive even at low input voltages.

Protection architecture includes dual-path over-current detection: VDS-based short-circuit sensing referenced to OCREF (0.8–2.62V range), and LSS shunt-based OCP with 53–80µs fixed off-time and 0.4–0.6V threshold. Fault reporting is via open-drain nFAULT, latched until reset by nSLEEP or VIN UVLO.

Key Specifications

Pinout & Package

MP6532-GR-P is housed in a 4mm × 4mm QFN-28 package with exposed thermal pad (connected to GND). Pin numbering follows standard top-view orientation with Pin 1 at top-left corner adjacent to VREG.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar three-phase BLDC pre-driver applications.

Compared with STSPIN32F0A and TB6605FTG, MP6532-GR-P delivers plug-and-play Hall-based commutation with wider voltage range, integrated charge pump, and proven 100% duty-cycle reliability-making it optimal for cost-sensitive, high-volume power tool designs where firmware overhead and supply headroom are constrained.

Availability

MP6532-GR-P is available at Aetrix Electronics and suitable for power drills, impact drivers, e-bike mid-drives, and industrial fans requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.

Supply support for MP6532-GR-P 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 MP6532 belongs to MPS's motor driver pre-driver product line, engineered specifically for cost-effective, Hall-sensor–based three-phase BLDC control in portable and industrial power tools.

FAQ

What is the minimum recommended bootstrap capacitor value for MP6532-GR-P?

The minimum bootstrap capacitance is calculated as C_BOOT > 8 × Q_G, where Q_G is the MOSFET's total gate charge in nC and C_BOOT is in nF. For typical 30nC MOSFETs, use ≥0.22µF. Recommended range is 0.1µF–1µF, X5R/X7R ceramic, rated ≥25V. Values above 1µF risk startup instability.

Can MP6532-GR-P operate with only two Hall sensors?

No. The MP6532 requires all three Hall inputs (HA, HB, HC) with internal 590kΩ pull-downs to execute its fixed 120° commutation logic. Missing or floating inputs cause undefined phase sequencing and potential shoot-through. All three must be connected to motor-mounted Hall sensors or actively driven.

How does the trickle-charge circuit maintain high-side gate voltage at 100% duty cycle?

An internal ~5µA current source continuously replenishes charge lost through bootstrap diode leakage and gate driver quiescent current. This offsets discharge between low-side conduction events, sustaining BSTx voltage above VREG – 2V even when the corresponding low-side FET remains off indefinitely.

Is external VREG bypassing mandatory, and what capacitor value is required?

Yes. A 10µF X7R or X5R ceramic capacitor rated ≥16V must be placed directly between VREG and GND. This stabilizes the charge-pump–regulated supply during peak gate drive current demands (e.g., simultaneous high-side turn-on across all phases) and prevents VREG droop-induced misfires.

What happens to nFAULT during thermal shutdown, and how is recovery performed?

During thermal shutdown, nFAULT is actively pulled low (open-drain) and remains latched until either VIN drops below UVLO threshold (~3.3V) and recovers, or nSLEEP is toggled low-then-high. No automatic recovery occurs-system-level reset logic must implement this sequence to restore operation safely.

Does MP6532-GR-P support sensorless commutation?

No. The MP6532 has no back-EMF sensing circuitry, comparator inputs, or firmware for sensorless algorithms. Its commutation engine is strictly Hall-sensor–dependent. For sensorless operation, an external MCU or dedicated sensorless gate driver (e.g., MP6530) is required.

Can the dead time be disabled entirely to maximize efficiency?

No. Dead time is mandatory to prevent shoot-through. The shortest configurable dead time is 30ns (when DT is tied to GND). Removing dead time risks simultaneous HS/LS conduction, causing destructive shoot-through currents. Always validate timing margins with oscilloscope measurements under worst-case load and temperature.