Monolithic Power Systems Inc. MP6650GJSR-0000-P

Overview

MP6650GJSR-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 - used in CPU/server fan control systems.

For engineers reviewing the MP6650GJSR-0000-P datasheet, MP6650GJSR-0000-P pinout, MP6650GJSR-0000-P application, or MP6650GJSR-0000-P equivalent, key selection criteria include Hall-integrated single-phase BLDC topology, TSOT23-6-RSL package compatibility, 26 kHz fixed switching frequency, PWM input frequency range (2–100 kHz), and integrated OVP/UVLO/thermal/RD protections.

Technical Context

The MP6650 implements a Hall-sensor-based commutation controller for single-phase BLDC fans, using internal N-channel half-bridge MOSFETs (HS-FET: 550 mΩ typ, LS-FET: 320 mΩ typ) and automatic phase-lock detection between winding BEMF and current zero-crossing. Its register-mapped configuration enables programmable starting duty (0x14H), current limit (SUCL bits), and soft-switching enable (SOFTEN bit).

It integrates reverse-voltage protection (RVP) that disables operation at V_CC = –18 V, input OVP (19.2 V threshold), UVLO (3.25 V rising), thermal shutdown (150 °C), and rotor deadlock detection with adaptive retry timing (0.6 s detection + 1.8–3.6 s lock-retry). The FG/RD pin provides dual-mode open-drain output for speed indication (FG) or fault reporting (RD).

Key Specifications

Pinout & Package

MP6650GJSR-0000-P uses the TSOT23-6-RSL package: 6-pin, 1.6 mm × 2.9 mm, 0.95 mm height, reverse-standard pinout (Pin 1 = upper-left when top marking read left-to-right), moisture sensitivity level (MSL) 1, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP6650GJSR-0000-P, the GJL variant requires no layout change for standard TSOT23-6 footprints, while the GJR variant trades tighter coplanarity control for broader manufacturing familiarity - both retain identical Hall sensitivity, protection thresholds, and register-programmable features.

Availability

MP6650GJSR-0000-P is available at Aetrix Electronics and suitable for CPU fan control, server chassis cooling, and industrial embedded fan modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP6650GJSR-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 LED controllers.

The MP6650 belongs to MPS's Phase Fan Driver product line, engineered specifically for intelligent, low-noise, single-phase BLDC fan control in computing and communications infrastructure - emphasizing integration, protection, and programmability.

FAQ

What is the function of the FG/RD pin?

The FG/RD pin is an open-drain output configurable via register FGRD[1:0] to report either rotational speed (FG mode, 1× or 0.5× Hall frequency) or rotor lock fault (RD mode, active-low during deadlock). It requires an external pull-up resistor (typically 4.7 kΩ) and drives system tachometers or BMC fault monitors.

How is the output current limit configured?

The output current limit is set by 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 adjusts the overload threshold for the high-side MOSFET only; over-current protection (OCP) remains fixed at 3 A for short-circuit conditions.

Does MP6650GJSR-0000-P require external MOSFETs?

No. MP6650GJSR-0000-P integrates a complete N-channel half-bridge (HS-FET + LS-FET) with total R_DS(on) of 740 mΩ (550 mΩ HS + 320 mΩ LS at 25°C). No external power switches are needed - only input capacitor (C1), pull-up resistor for FG/RD, and optional input snubber.

What is the purpose of the soft on/off phase transition?

Soft on/off transitions gradually ramp the output duty cycle over 16 steps (22.5°–45° electrical angle) to reduce di/dt, minimizing acoustic noise, mechanical vibration, and EMI. This feature is enabled via SOFTEN bit in register 0x0D and is especially effective at low-speed operation.

Can the MP6650 drive motors other than fans?

MP6650 is optimized for single-phase BLDC fan motors with integrated Hall sensors and typical loads ≤2 A. While it can drive other small single-phase BLDC loads, its commutation logic, FG/RD timing, and protection thresholds (e.g., RD detection window) are tuned for fan-specific behavior - not general-purpose motor control.

How is the starting PWM duty configured?

The starting PWM duty is set by the DUTY_STARTING[7:0] register (0x14H): value 0x20 = 12.5%. When SPD_ZERO = 1 (default), fan remains stopped below this threshold; above 13.7% (1.2% hysteresis), rotation begins. Register values 0x00–0xFF map linearly to 0–100% duty.

Is the Hall sensor position fixed within the package?

Yes. The Hall sensor cell is located at (X,Y,Z) = (540 µm, 508 µm, 80 µm) from the package origin - bottom-left corner in top view. Mechanical mounting must align the rotor magnet pole trajectory with this fixed sensing location for reliable commutation.