Monolithic Power Systems Inc. MP6651GD-0000-P

Overview

MP6651GD-0000-P from Monolithic Power Systems is a single-phase brushless DC (BLDC) motor driver IC with integrated Hall-effect sensor, dual power MOSFETs, and configurable commutation logic. It operates from 3.3V to 18V, delivers 2A continuous output in QFN-10 package, supports 2kHz–100kHz PWM speed control, and provides rotor lock detection via open-drain FG/RD pin. It is deployed in high-current cooling fans requiring precise low-speed torque and robust thermal/overcurrent protection.

For engineers reviewing the MP6651GD-0000-P datasheet, MP6651GD-0000-P pinout, MP6651GD-0000-P application, or MP6651GD-0000-P equivalent, key selection considerations include its integrated Hall sensor offset angle tuning (±45°), soft-on/off commutation configurability (up to 45°), 4-step current limit (1A–4A), fixed 27kHz switching frequency, and dual-package availability (QFN-10 vs SOIC-8).

Technical Context

The MP6651GD-0000-P implements closed-loop BLDC commutation using an on-chip Hall sensor whose signal is phase-shifted via programmable HAL_ANG registers (three ranges, ±45° max), enabling independent optimization of low- and high-speed torque response. Its H-bridge drives OUT1/OUT2 with configurable soft-on (SON_ANG) and soft-off (SOFF_ANG) angles up to 45°, plus advanced soft-off initiation (SOFFADV) for smoother transitions.

Speed regulation is achieved by mapping input PWM duty cycle (2–100 kHz) to output duty cycle, with DIN_MIN/DO_MIN registers defining startup behavior and SPD_ZERO selecting zero-speed hold below threshold. Protection logic includes cycle-by-cycle OCP (configurable 1–4A), auto-recovering thermal shutdown (160°C trip, 120°C release), OVP (19V rising), UVLO (3.3V rising), and rotor lock detection (0.6s timeout, auto-restart).

Key Specifications

Pinout & Package

MP6651GD-0000-P is housed in a thermally enhanced QFN-10 package (2mm × 3mm, 0.5mm pitch) with exposed thermal pad. Pin 1 is marked by dot; pins are numbered counterclockwise starting from top-left corner when viewed top-side.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP6651GD-0000-P, MP6532GD-Z trades integrated Hall functionality for higher current, while TB6612FNG shifts all commutation intelligence to the host MCU-making MP6651GD-0000-P optimal for compact, self-contained fan modules needing minimal external components and deterministic timing.

Availability

MP6651GD-0000-P is available at Aetrix Electronics and suitable for high-current cooling fans, personal computer CPU fans, single-phase BLDC server fans, and industrial enclosure ventilation fans requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP6651GD-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, including DC/DC converters, motor drivers, and LED controllers, with global manufacturing and quality certifications.

The MP6651 product line is designed specifically for intelligent, self-commutating single-phase BLDC fans in computing, networking, and industrial cooling-emphasizing integration, configurability, and robust fault handling without external microcontrollers.

FAQ

What is the function of the TST pin on MP6651GD-0000-P?

The TST (Test) pin is a factory programming interface used during OTP configuration and register calibration. In normal operation, it must be connected to GND to ensure stable device behavior. Leaving it floating or applying voltage may cause undefined operation or prevent startup.

Can MP6651GD-0000-P drive a three-phase BLDC motor?

No. MP6651GD-0000-P is strictly a single-phase BLDC driver with two outputs (OUT1/OUT2) and one integrated Hall sensor. It lacks the three half-bridge outputs, Hall inputs, and commutation logic required for three-phase motors. Use MPS's MP6530 or MP6532 for three-phase applications.

How is the Hall offset angle configured, and why is it useful?

The Hall offset angle is set via three 5-bit registers (HAL_ANG1/2/3) corresponding to low/mid/high PWM duty ranges, with ±45° maximum adjustment in 1.4° steps. It compensates for mechanical magnet misalignment or thermal drift, improving torque consistency and reducing vibration across the full speed range.

What happens when the FG/RD pin is configured for rotor lock (RD) mode?

When FGRD_SEL = 11, the FG/RD pin becomes a rotor lock indicator: it outputs a sustained high (if RD_H_L = 1) or low (if RD_H_L = 0) signal during detected lock condition. The device simultaneously disables OUT1/OUT2 and initiates auto-recovery after LOCK_SEL delay (3.6–8.4s), then retries commutation.

Is the OSC resistor value fixed, and what tolerance is required?

Yes-the OSC pin requires a precisely 20kΩ resistor connected to GND to achieve the nominal 27kHz switching frequency. A 1% or better tolerance is mandatory; deviation beyond ±1% causes measurable fSW drift, affecting EMI performance and thermal distribution in the MOSFETs.

Does MP6651GD-0000-P support reverse rotation?

No. The MP6651GD-0000-P implements unidirectional commutation logic based on the polarity and timing of the internal Hall sensor. Rotation direction is determined by motor winding and magnet orientation; reversing physical connections may damage the device or cause erratic behavior.

What is the minimum input voltage required for reliable Hall sensor operation?

The Hall sensor operates reliably down to the UVLO rising threshold of 3.3V. Below this, the entire IC-including Hall sensing, gate drive, and logic-is disabled. At 3.3V, typical supply current is 5.4mA, and Hall offset tuning remains functional across the full temperature range (-40°C to +125°C).