Monolithic Power Systems Inc. MP6650GJS-0000-Z

Overview

MP6650GJS-0000-Z from Monolithic Power Systems is a single-phase BLDC motor driver IC with integrated Hall-effect sensor, power MOSFETs (740 mΩ total R_DS(on)), and reverse-voltage protection. It delivers up to 2 A output current, operates from 3.3 V to 18 V, and features configurable speed curve, soft on/off phase transitions, and rotor lock detection via open-drain FG/RD pin - used in CPU fan control for servers and desktop PCs.

For engineers reviewing the MP6650GJS-0000-Z datasheet, MP6650GJS-0000-Z pinout, MP6650GJS-0000-Z application, or MP6650GJS-0000-Z equivalent, key selection criteria include integrated Hall sensing, TSOT23-6-SL package compatibility, 26 kHz fixed switching frequency, PWM input frequency range (2–100 kHz), and thermal/overvoltage/rotor-lock protection architecture.

Technical Context

The MP6650 implements closed-loop commutation using an embedded Hall sensor to detect rotor position and synchronize H-bridge switching with winding BEMF zero-crossing via automatic phase-lock logic. Its dual-mode FG/RD pin provides either rotational speed feedback (FG) or open-drain rotor deadlock fault indication (RD), configurable via register 0x0A.

Speed control is achieved through a linear PWM-to-duty mapping with programmable starting threshold (register 0x14), adjustable soft-start time (2.6 s or 5.2 s), and configurable overload current limit (0.7 A / 1.1 A / 1.6 A / 2 A). Protection includes input OVP (19.2 V), UVLO (3.25 V), thermal shutdown (150 °C), and reverse-voltage protection without external diode.

Key Specifications

Pinout & Package

MP6650GJS-0000-Z is housed in a TSOT23-6-SL package - a 6-pin, lead-free, surface-mount package with normal pinout orientation and 0.95 mm pitch. The package supports reflow soldering per JEDEC MO-193 and offers compact footprint (2.9 mm × 1.6 mm) for space-constrained fan modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP6651GJS-0000-Z, MP6650GJS-0000-Z trades I²C configurability for lower gate count and reduced layout complexity; versus DRV10970PWP, it delivers identical functionality in 1/3 the PCB area but with fixed 2 A limit and no external Hall option.

Availability

MP6650GJS-0000-Z is available at Aetrix Electronics and suitable for CPU fan control, server rack cooling, industrial embedded fans, and network equipment cooling requiring stable component supply and long-term production continuity.

Supply support for MP6650GJS-0000-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 power management ICs, with design focus on efficiency, integration, and reliability for computing, industrial, and automotive markets.

The MP6650 belongs to MPS's Phase Fan Driver product line, engineered specifically for cost-sensitive, space-constrained single-phase BLDC fan applications requiring integrated sensing, protection, and minimal external components.

FAQ

What is the function of the FG/RD pin?

The FG/RD pin serves dual roles: as an open-drain tachometer (FG) output providing pulse-per-revolution feedback, or as a rotor lock fault indicator (RD) when configured via register 0x0A. It requires an external pull-up resistor (typically 4.7 kΩ) and supports both functions without hardware change - selected in firmware.

Does MP6650GJS-0000-Z require external MOSFETs?

No. MP6650GJS-0000-Z integrates both high-side and low-side N-channel MOSFETs with combined R_DS(on) of 740 mΩ. This eliminates external power switches, reduces PCB area, and simplifies thermal design - enabling direct connection to fan windings with only input capacitor and pull-up resistor.

How is rotor lock detected and recovered?

Rotor lock is detected when no Hall sensor edge transition occurs within 0.45–0.75 s. The IC then asserts RD on FG/RD pin and initiates auto-retry after a programmable delay (1.8–3.6 s). Recovery occurs automatically upon detecting three consecutive Hall edges, ensuring hands-off fault handling in unattended systems.

Can the speed vs. PWM duty curve be customized?

Yes. The MP6650 supports fully configurable speed curves via OTP registers 0x00–0x08 (output duty lookup table) and 0x14 (starting duty threshold). Users can program nonlinear mappings - e.g., logarithmic response for quiet low-speed operation or linear ramp for precise thermal control - using MPS GUI software.

What protection features are built-in?

MP6650GJS-0000-Z includes input overvoltage (19.2 V), undervoltage lockout (3.25 V), thermal shutdown (150 °C), rotor deadlock detection, overcurrent protection (3 A trip), and reverse-voltage protection (−18 V). All protections feature automatic recovery except thermal shutdown, which resumes once die cools below hysteresis threshold.

Is the TSOT23-6-SL package RoHS-compliant and lead-free?

Yes. MP6650GJS-0000-Z uses a lead-free, halogen-free TSOT23-6-SL package compliant with EU RoHS Directive 2011/65/EU and meets MPS green status requirements. The device is rated MSL Level 1 and qualified for standard reflow soldering profiles per JEDEC J-STD-020.