Monolithic Power Systems Inc. MP6532GR-Z

Overview

MP6532GR-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, integrates Hall-sensor-based 120° commutation logic, delivers 0.8A source / 1A sink gate drive, and enables 100% duty-cycle operation via trickle-charged bootstrap circuitry - deployed in cordless power tools like impact drivers and e-bike motor controllers.

For engineers reviewing the MP6532GR-Z datasheet, MP6532GR-Z pinout, MP6532GR-Z application, or MP6532GR-Z equivalent, key selection considerations include its programmable short-circuit protection threshold (0.8–2.62V), adjustable dead-time control (30ns–6µs), integrated VREG-regulated 11.5V gate supply, and thermal shutdown at 150°C - all critical for robust motor phase control in high-current industrial motion systems.

Technical Context

The MP6532GR-Z implements a charge-pump-regulated VREG output (10–12.8V) to power low-side gate drivers and sustain high-side gate drive via bootstrap capacitors with internal trickle-charge current (~5µA), enabling continuous conduction without bootstrap voltage collapse. Its Hall-input commutation engine decodes three 120°-spaced digital signals to sequence phase activation.

Protection architecture combines dual overcurrent detection methods: VDS-sensing short-circuit protection (with 3µs deglitch time and OCREF-referenced threshold) and LSS-shunt-based OCP (with fixed 53–80µs off-time and 0.4–0.6V trip threshold), plus UVLO (3.3–4.5V rising threshold), thermal shutdown (150°C), and shoot-through prevention via resistor-programmable dead time.

Key Specifications

Pinout & Package

MP6532GR-Z is housed in a thermally enhanced 4mm × 4mm QFN-28 package with exposed thermal pad connected to GND, supporting up to 2.9W continuous power dissipation at +25°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STSPIN32F0B and TB6605FTG, MP6532GR-Z uniquely combines Hall-based 120° commutation, resistor-programmable dead time, and trickle-charged bootstrap in a single QFN package - making it optimal for production-ready, high-reliability cordless tool and e-bike motor controllers without firmware overhead.

Availability

MP6532GR-Z is available at Aetrix Electronics and suitable for cordless power tools, e-bike motor controllers, and industrial fan speed regulation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP6532GR-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 distribution through authorized partners.

The MP6532 belongs to MPS's motor driver product line, engineered specifically for cost-effective, high-efficiency three-phase BLDC motor control in battery-powered and industrial equipment - emphasizing integration, thermal resilience, and protection robustness.

FAQ

What is the minimum recommended bootstrap capacitor value for MP6532GR-Z?

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 20–50nC MOSFETs, 0.1µF to 0.47µF X7R/X5R ceramic capacitors rated ≥25V are recommended. Values exceeding 1µF may cause startup instability due to excessive inrush current into the bootstrap node.

How does the MP6532GR-Z handle 100% duty-cycle operation without bootstrap voltage collapse?

MP6532GR-Z uses an internal trickle-charge pump that supplies ~5µA to each bootstrap capacitor during high-side conduction, compensating for leakage and maintaining sufficient gate voltage even at 100% duty cycle. This eliminates reliance on low-side switching for bootstrap recharge - a key differentiator versus basic bootstrap-only drivers.

Can the MP6532GR-Z operate without Hall sensors?

No - the MP6532GR-Z requires three Hall sensor inputs (HA, HB, HC) for its built-in 120° commutation logic. It does not support sensorless (BEMF) or external MCU-controlled commutation. For sensorless operation, a different pre-driver or integrated motor controller must be selected.

What is the purpose of the LSS pin, and how is its threshold set?

The LSS pin monitors voltage across an external low-side shunt resistor to implement overcurrent protection. Its threshold is fixed at 0.4–0.6V (typical 0.5V); current limit is set by selecting shunt resistance (e.g., 5mΩ yields 100A trip). If OCP is unused, LSS must be tied directly to ground along with all MOSFET sources.

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 and ≤1µA high-state leakage at 3.3V. A standard 10kΩ pull-up to 3.3V provides clean logic-level signaling to most MCUs without level-shifting circuitry.

How does dead-time adjustment affect motor efficiency and EMI?

Shorter dead time reduces body-diode conduction loss and improves efficiency at high PWM frequencies, but risks shoot-through if too short for MOSFET turn-off delay and layout parasitics. Longer dead time increases safe margin but raises switching losses and audible noise. A 200kΩ RDT (≈0.74µs) is a validated starting point for most 24V–48V tool applications.

Does MP6532GR-Z support regenerative braking?

MP6532GR-Z does not actively control regenerative braking - it only supports passive freewheeling via body diodes or active braking via nBRAKE (all low-side FETs ON). Regen requires external synchronous rectification control and energy return circuitry beyond this pre-driver's scope.