Monolithic Power Systems Inc. MP6650GJR-0000-Z

Overview

MP6650GJR-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 MP6650GJR-0000-Z datasheet, MP6650GJR-0000-Z pinout, MP6650GJR-0000-Z application, or MP6650GJR-0000-Z equivalent, key selection criteria include Hall-integrated single-phase drive capability, TSOT23-6-R package compatibility, 26 kHz fixed switching frequency, input reverse protection, and programmable current limit (0.7–2 A) for thermal and acoustic optimization in compact fan modules.

Technical Context

The MP6650 implements closed-loop commutation using an embedded Hall sensor to detect rotor position and synchronize MOSFET switching with winding BEMF zero-crossing via automatic phase-lock logic. Its PWM interface accepts 2–100 kHz signals to linearly scale output duty cycle while maintaining fixed 26 kHz internal switching frequency above audible range.

Protection architecture includes input OVP (19.2 V), UVLO (3.25 V), thermal shutdown (150 °C), rotor deadlock detection (0.6 s timeout), and configurable overload current limiting (0.7–2 A). The FG/RD pin serves dual function - rotational speed indication (FG) or open-drain rotor lock fault signal (RD) - selected via register bit FGRD[1:0].

Key Specifications

Pinout & Package

MP6650GJR-0000-Z is housed in TSOT23-6-R package - a 6-pin, reverse-pinout variant of the standard TSOT23-6, with Pin 1 located at upper-left when reading top marking left-to-right. Package dimensions comply with JEDEC MO-193 AB variation and support reflow-compatible PCB assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP6650GJR-0000-Z, the MP6650GJL-0000-Z offers identical functionality in a mechanically incompatible package, while the MP6651GJR-0000-Z delivers measurable improvements in Hall sensitivity, conduction loss, and thermal robustness - justifying migration only when those parameters impact system-level acoustic, efficiency, or lifetime requirements.

Availability

MP6650GJR-0000-Z is available at Aetrix Electronics and suitable for CPU fan control, server chassis cooling, desktop thermal management, and industrial embedded fan modules requiring stable component supply, consistent parametric performance, and long-term lifecycle support.

Supply support for MP6650GJR-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 over two decades of expertise in DC-DC converters, motor drivers, and LED controllers.

The MP6650 belongs to MPS's Phase Fan Driver product line, designed specifically for cost-sensitive, space-constrained BLDC fan applications requiring integrated Hall sensing, programmable speed profiles, and comprehensive fault protection - targeting data center, computing, and industrial thermal markets.

FAQ

What is the difference between MP6650GJR-0000-Z and MP6650GJL-0000-Z?

The MP6650GJR-0000-Z uses the TSOT23-6-R package with reverse pinout (Pin 1 at upper-left), while MP6650GJL-0000-Z uses TSOT23-6-L (Pin 1 at lower-left). Electrical specifications, register map, and functional behavior are identical; only PCB layout and top-mark orientation differ. No firmware or configuration changes are required when swapping between them.

Does MP6650GJR-0000-Z require external programming to operate?

No. MP6650GJR-0000-Z operates out-of-the-box with factory-default register settings: 1.6 A current limit (SUCL = 10), FG output mode (FGRD = 00), soft switching enabled (SOFTEN = 1), and 12.5% PWM starting duty (14H = 0x20). Programming via test mode is optional for custom speed curves, current limits, or rotor lock retry timing.

How does the FG/RD pin function in dual-mode operation?

The FG/RD pin operates as an open-drain output whose function is selected by register bit FGRD[1:0]: 00 = full-speed tachometer (1× Hall frequency), 01 = half-speed tachometer (0.5× Hall frequency), 11 = rotor lock fault indicator (active-low pulse during deadlock). Mode selection is non-volatile and persists across power cycles.

What thermal derating applies at 85°C ambient temperature?

With θ_JA = 100 °C/W and T_J(MAX) = 150 °C, maximum continuous power dissipation at 85°C ambient is 0.65 W. At 12 V input and 2 A load, conduction loss is ~1.48 W (I²R = 2² × 0.74), exceeding this limit - thus continuous 2 A operation requires forced airflow or heatsinking to maintain junction temperature ≤150°C.

Can MP6650GJR-0000-Z drive a three-phase BLDC motor?

No. MP6650GJR-0000-Z is strictly a single-phase driver with one half-bridge (OUT1/OUT2) and one integrated Hall sensor. It commutates only two-wire fan motors with center-tapped windings. Three-phase motors require dedicated 3-phase gate drivers (e.g., MP6530) or microcontroller-based solutions.

What is the minimum PWM duty cycle required to start motor rotation?

Motor starts rotating when PWM input duty exceeds the value set in register 14H (DUTY_STARTING), with 1.2% hysteresis. Default value is 0x20 (12.5%), so startup occurs at ≥13.7% duty. Below that, output remains at zero (if SPD_ZERO = 1) or minimum programmed duty (if SPD_ZERO = 0).

Is input capacitor C1 mandatory, and what value is recommended?

Yes - C1 is mandatory for stable VCC regulation and EMI suppression. For 12 V, ≤2 A applications, a 1 µF X7R ceramic capacitor placed within 2 mm of VCC/GND pins is recommended. Larger electrolytic capacitors (e.g., 10–47 µF) may be added in parallel for high-inertia fans to absorb back-EMF energy.