Monolithic Power Systems Inc. MP6631HGL-0000-P

Overview

MP6631HGL-0000-P from Monolithic Power Systems is a three-phase BLDC motor driver IC with integrated 160mΩ high-side and low-side MOSFETs, supporting 3.6V–24V input, up to 3A peak phase current, sinusoidal drive, and single- or triple-Hall sensor interface for fan and pump control in thermal management systems.

For engineers reviewing the MP6631HGL-0000-P datasheet, MP6631HGL-0000-P pinout, MP6631HGL-0000-P application, or MP6631HGL-0000-P equivalent, key selection considerations include closed/open-loop speed control via PWM/DC pin, FG/RD rotational speed detection, DIR-controlled direction, and integrated OCP/UVLO/thermal shutdown protection for reliable motor operation.

Technical Context

The MP6631 implements a Hall-sensor-based commutation controller with configurable soft-start (1.3–10.4s), pre-startup timing (2.5–20ms), and five-point programmable speed curve (37.5%–100% duty) for precise torque and noise optimization across speed ranges.

It features dual-mode speed control: open-loop (duty-cycle tracking) when OPEN_L = 1, and closed-loop (Hall-edge feedback) when OPEN_L = 0/CLOSE_H = 1, with integrator gain adjustable via KI/KP registers for dynamic response tuning.

Key Specifications

Pinout & Package

MP6631HGL-0000-P is housed in a thermally enhanced QFN-26 (3mm × 4mm, 0.5mm pitch) package with exposed thermal pad, optimized for compact fan driver PCB layouts and efficient heat dissipation in enclosed enclosures.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP6631HGL-0000-P, MP6532HGL-0000-P trades configurability and thermal efficiency for lower unit cost, while TB6605FTG shifts complexity to external components to achieve wider voltage range and higher peak current-making MP6631 optimal for compact, programmable, mid-power fan modules.

Availability

MP6631HGL-0000-P is available at Aetrix Electronics and suitable for server cooling fans, industrial heat exchangers, medical blowers, and automotive cabin air pumps requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for MP6631HGL-0000-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 power management ICs, with over two decades of expertise in DC/DC converters, motor drivers, and battery management solutions.

The MP6631 belongs to MPS's fan driver product line, engineered specifically for intelligent thermal management in computing, industrial, and medical equipment-emphasizing low-noise sinusoidal drive, Hall-sensor flexibility, and field-programmable protection.

FAQ

What Hall sensor configurations does MP6631HGL-0000-P support?

The MP6631HGL-0000-P supports both single-Hall (using HC+ and HC− only) and triple-Hall (HA+/HA−, HB+/HB−, HC+/HC−) configurations. The SINGLE register bit (REG05h[1]) selects mode; single-Hall reduces sensor count and wiring, while triple-Hall improves commutation accuracy and low-speed stability.

How is speed controlled using the PWM/DC pin?

Speed is controlled via the PWM/DC pin either as a 1kHz–100kHz PWM signal (DC_PWM = 0) or a 0–1.2V analog voltage (DC_PWM = 1). Closed-loop mode uses Hall-edge feedback to maintain target RPM; open-loop mode directly maps input duty to output duty. Configuration is set via OPEN_L and CLOSE_H bits in REG04h.

What protections are implemented and how do they behave?

MP6631HGL-0000-P includes under-voltage lockout (3.3V rising threshold), cycle-by-cycle OCP (2.7–3A), 0.5s rotor lock detection with 4.5s auto-restart, and thermal shutdown at 160°C (with 25°C hysteresis). All protections are hardware-based and active without firmware intervention, ensuring fail-safe operation in unattended systems.

Can the FG/RD pin be used for both speed monitoring and fault reporting?

Yes-the FG/RD pin operates in dual mode. When FGRD[1:0] = 00–10, it outputs Hall-edge pulses (FG) scaled 1x/1/2x/1/4x or 1x/1/2x/3x for RPM calculation. When FGRD[1:0] = 11, it asserts low during rotor lock (RD) for direct fault indication-eliminating need for external logic to interpret stall conditions.

Is external current sensing required for OCP functionality?

No-OCP is implemented internally using MOSFET RDS(ON) sensing. The device monitors voltage drop across high-side FETs during blanking time and triggers cycle-by-cycle shutdown if current exceeds the register-set threshold (OCP[1:0]). No external shunt resistor or amplifier is needed.

What is the purpose of the REF pin and its load capability?

The REF pin delivers a precision 5.24V output (±1% over temperature) with load regulation ≤5.2V at 30mA. It serves as a stable reference for external ADCs measuring motor current or temperature, or for biasing Hall sensors-reducing system-level component count and improving measurement accuracy.

How does the soft-start function reduce inrush current?

Soft-start (TDYN[1:0]) linearly ramps the reference speed from 0% to 100% over 1.3–10.4s, limiting initial duty cycle and preventing peak current surges. Combined with pre-startup timer (TPRE[1:0]), which gradually increases output duty in 2.5–20ms steps before full commutation, it ensures reliable start under mechanical load or low-temperature viscosity.