Monolithic Power Systems Inc. MP6650GJR-0000-P

Overview

MP6650GJR-0000-P from Monolithic Power Systems is a single-phase brushless DC 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 - deployed in CPU/server fan control systems.

For engineers reviewing the MP6650GJR-0000-P datasheet, MP6650GJR-0000-P pinout, MP6650GJR-0000-P application, or MP6650GJR-0000-P equivalent, key selection criteria include Hall-integrated commutation, TSOT23-6-R package compatibility, 26 kHz fixed switching frequency, input reverse protection, and programmable overload current limit (0.7–2 A).

Technical Context

The MP6650 implements closed-loop single-phase BLDC commutation using an embedded Hall sensor to detect rotor position and synchronize H-bridge switching. Its automatic phase-lock function aligns winding BEMF zero-crossing with current zero-crossing, enabling stable low-speed operation and reducing torque ripple.

It integrates dual N-channel MOSFETs (HS-FET + LS-FET) with combined 740 mΩ R_DS(on), supports PWM speed control (2–100 kHz input), outputs FG signal at 100% or 50% Hall frequency, and provides rotor deadlock (RD) fault indication via the same FG/RD pin with configurable polarity and retry timing.

Key Specifications

Pinout & Package

MP6650GJR-0000-P uses the TSOT23-6-R package - a 6-pin, reverse-pinout variant of the standard TSOT23-6 footprint where Pin 1 is located at the upper-left corner when viewing the top marking left-to-right. This variant simplifies PCB layout in space-constrained fan modules by enabling mirrored routing versus TSOT23-6-L.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP6650GJL-0000-P, the GJR variant offers identical performance in a reversed pinout for layout optimization, while the DRV10983ZPWPR demands significant redesign due to its three-phase architecture, external sensor dependency, and absence of integrated protections like RVP and automatic phase-lock.

Availability

MP6650GJR-0000-P is available at Aetrix Electronics and suitable for CPU fan control, server rack cooling, and industrial embedded controller cooling requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for MP6650GJR-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 - headquartered in Kirkland, WA, with global design and support centers.

The MP6650 belongs to MPS's Phase Fan Driver product line, engineered specifically for cost-sensitive, space-constrained single-phase BLDC fan applications where integration of Hall sensing, MOSFETs, and protections reduces system-level complexity and improves acoustic performance.

FAQ

What is the function of the FG/RD pin?

The FG/RD pin serves dual purpose: as an open-drain tachometer (FG) output indicating rotational speed (100% or 50% of Hall frequency), or as a rotor lock (RD) fault indicator. Its mode is selected via the FGRD bits (0x0A register); when RD is active, it asserts low or high depending on RD_HL bit setting, with configurable retry timing.

How is the output current limit configured?

The output current limit is set via the SUCL[1:0] bits in register 0x0A: 00 = 0.7 A, 01 = 1.1 A, 10 = 1.6 A (default), 11 = 2 A. This limit triggers immediate HS-FET shutdown during overload, with recovery in the next switching cycle - distinct from the 3 A OCP threshold that disables both FETs.

Does MP6650GJR-0000-P require external MOSFETs?

No. MP6650GJR-0000-P integrates two N-channel power MOSFETs (HS-FET and LS-FET) with total R_DS(on) of 740 mΩ. It drives the motor directly without external switches, requiring only an input capacitor (C1), optional snubber resistor (R1), and pull-up on FG/RD - minimizing external component count.

What is the significance of the "R" in TSOT23-6-R?

The "R" denotes reverse pinout orientation: Pin 1 is at the upper-left corner when reading the top marking left-to-right, unlike TSOT23-6-L where Pin 1 is lower-left. This variant maintains identical electrical behavior but enables alternate PCB routing strategies - critical for dense fan module layouts.

Can the speed vs. PWM duty curve be customized?

Yes. The 00h–08h registers store an 8-entry lookup table defining output duty vs. input PWM duty. Register 0x14 (DUTY_STARTING) sets the minimum input duty required to initiate rotation (e.g., 0x20 = 12.5%). This enables linear, logarithmic, or application-specific fan curves without firmware changes.

How does the automatic phase-lock function improve motor operation?

The automatic phase-lock continuously aligns H-bridge switching edges with winding BEMF zero-crossing points detected by the integrated Hall sensor. This synchronization minimizes torque ripple, enables stable operation below 1,000 RPM, and eliminates the need for external timing capacitors or manual commutation tuning.

Is input reverse-voltage protection active during normal operation?

Yes. Input reverse-voltage protection (RVP) is always active: when VCC is driven negative (e.g., −18 V), the IC shuts down internal circuitry and draws only 1 mA reverse current, protecting itself and downstream components without requiring an external series diode - verified across −40°C to +125°C.