Monolithic Power Systems Inc. MP6532GF

Overview

MP6532GF from Monolithic Power Systems is a three-phase BLDC motor pre-driver IC designed to control external N-channel MOSFET half-bridges in 5V–60V systems. It integrates 120° Hall-sensor commutation logic, charge-pump–boosted gate drive (11.5V VREG), 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 and e-bike motor controllers.

For engineers reviewing the MP6532GF datasheet, MP6532GF pinout, MP6532GF application, or MP6532GF equivalent, key selection considerations include its 0.8A source / 1A sink gate drive capability, adjustable dead-time via RDT resistor, integrated LSS-based OCP with 53–80µs fixed off-time, and thermal shutdown at 150°C - all critical for robust motor phase control in industrial and portable applications.

Technical Context

The MP6532GF implements a fully integrated commutation engine using three Hall sensor inputs (HA/HB/HC) with internal pulldowns and supports direction (DIR), PWM speed modulation, and active-low braking (nBRAKE). Its gate drive architecture combines a regulated charge pump (110kHz, 11.5V typical VREG output) for low-side drive and bootstrap capacitors with an internal 5µA trickle-charge circuit to sustain high-side drive under continuous conduction.

Protection is implemented via dual-path current sensing: VDS-based short-circuit detection referenced to OCREF (±0.2V accuracy at 25°C), and LSS shunt-based over-current protection with 0.4–0.6V threshold and 3µs deglitch time. Fault conditions trigger open-drain nFAULT assertion and latched shutdown until reset by nSLEEP or VIN UVLO recovery.

Key Specifications

Pinout & Package

TSSOP-28 EP package (9.7mm × 6.4mm) with exposed thermal pad connected to GND - provides 3.9W power dissipation at +25°C ambient and θJA = 32°C/W for reliable thermal management in compact motor driver PCBs.

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 TMC6300-LA, MP6532GF delivers immediate Hall-based commutation without firmware, supports 100% duty cycle via trickle-charge, and offers simpler board-level integration - making it optimal for cost-sensitive, high-volume power tool and e-bike designs where deterministic timing and minimal BOM are critical.

Availability

MP6532GF is available at Aetrix Electronics and suitable for power drills, impact drivers, and e-bike motor controllers requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.

Supply support for MP6532GF 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 emphasis on efficiency, integration, and thermal robustness.

The MP6532 product line targets cost-effective, high-reliability BLDC motor control in portable and industrial equipment - delivering integrated gate drive, protection, and commutation in thermally enhanced surface-mount packages.

FAQ

What is the maximum continuous operating voltage for MP6532GF?

The MP6532GF supports a recommended operating input voltage range of 5V to 60V. Its absolute maximum VIN rating is 65V, but sustained operation above 60V risks reliability degradation and violates the specified operating conditions. Transient spikes beyond 65V require external TVS clamping.

How does the trickle-charge circuit enable 100% duty cycle operation?

The internal trickle-charge circuit supplies ~5µA to each bootstrap capacitor during high-side conduction, compensating for leakage and ensuring sufficient gate voltage remains to maintain MOSFET turn-on - eliminating the need for external charge pumps or complex bootstrap diode networks in continuous-conduction applications.

Can MP6532GF operate without Hall sensors?

No - MP6532GF relies exclusively on three 120°-spaced Hall sensor inputs (HA/HB/HC) for commutation timing. It does not support sensorless back-EMF detection or encoder interfaces. Removing Hall inputs disables commutation logic and prevents proper phase sequencing.

What is the purpose of the LSS pin and how is OCP configured?

The LSS pin senses voltage across an external low-side shunt resistor. When LSS exceeds 0.4–0.6V, the IC forces the corresponding high-side FET off and turns on the low-side FET for a fixed 53–80µs off-time - limiting peak current during motor stall or overload without requiring external comparators or timers.

Is MP6532GF pin-compatible with MP6532GR (QFN-28)?

No - MP6532GF (TSSOP-28 EP) and MP6532GR (QFN-28) share identical functionality and electrical specifications but have different pinouts and thermal pad configurations. Their pin mappings differ significantly (e.g., VIN is Pin 1 in TSSOP vs. Pin 28 in QFN), requiring separate PCB layouts.

How is dead time adjusted and what is the minimum achievable value?

Dead time is set by connecting a resistor (RDT) from the DT pin to GND. The relationship is tDEAD(ns) = 3.7 × R(kΩ). With DT tied directly to GND, the internal minimum dead time is 30ns - sufficient to prevent shoot-through in fast-switching, low-Qg MOSFET designs.

Does MP6532GF support regenerative braking?

MP6532GF does not actively manage regenerative braking. Its nBRAKE function only enables dynamic braking (shorting motor phases to GND). Regeneration requires external circuitry - such as bidirectional DC-DC converters or H-bridge topologies with synchronous rectification - which this pre-driver does not control or monitor.