Monolithic Power Systems Inc. MP6616GD-0000-Z

Overview

MP6616GD-0000-Z from Monolithic Power Systems is a single-phase BLDC motor driver IC with integrated Hall-effect sensor, 2A output current capability, 3.3V–18V input range, and embedded power MOSFETs (100mΩ R_DS(ON)). It delivers closed-loop or open-loop speed control via PWM input (1kHz–100kHz) and supports up to 40,000rpm motor operation in server cooling applications.

For engineers reviewing the MP6616GD-0000-Z datasheet, MP6616GD-0000-Z pinout, MP6616GD-0000-Z application, or MP6616GD-0000-Z equivalent, key selection criteria include configurable Hall offset angle (±45°), soft commutation angle (up to 45°), locked rotor auto-recovery, thermal shutdown with hysteresis, and QFN-10 package compatibility for high-density fan PCB layouts.

Technical Context

The MP6616GD-0000-Z implements a Hall-sensor-based commutation controller with digital register-programmable timing parameters including soft on/off angles (θ_{S_ON}/θ_{S_OFF} ≤ 45°), Hall offset trim (±45°), and advanced soft-off angle (θ_ADV ≤ 45°). Its internal 27kHz fixed-frequency oscillator drives gate drivers synchronized to Hall transitions.

It integrates dual N-channel power MOSFETs (HS-FET: 52mΩ typ, LS-FET: 44mΩ typ at 100mA), a 2mT sensitivity Hall sensor, and a programmable OCP threshold (1A/2A/3A/4A). The FG/RD pin provides open-drain speed feedback or rotor lock indication, configurable via register bits.

Key Specifications

Pinout & Package

MP6616GD-0000-Z is housed in a thermally enhanced QFN-10 (2mm × 3mm) package with exposed thermal pad, optimized for high-power density fan driver applications requiring minimal board area and efficient heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP6612GD-Z and TB67H401FNG, MP6616GD-0000-Z uniquely integrates Hall sensing and commutation logic in a 2mm×3mm footprint, eliminating external Hall components and simplifying layout - critical for space-constrained 1U server fan designs where BOM reduction and thermal performance are prioritized over raw current headroom.

Availability

MP6616GD-0000-Z is available at Aetrix Electronics and suitable for 1U server fan control, CPU cooling modules, and industrial embedded cooling requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP6616GD-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 expertise in DC/DC converters, motor drivers, and battery management solutions.

The MP6616 product line targets intelligent cooling systems, delivering integrated Hall-sensor BLDC drivers that simplify fan control architecture while meeting stringent efficiency, noise, and reliability requirements in data center and computing applications.

FAQ

What is the function of the TST pin on MP6616GD-0000-Z?

The TST (Test) pin enables register programming mode when pulled low. It allows full read/write access to internal configuration registers-including Hall offset, soft commutation angles, and OCP thresholds-via the MPS Fan Driver GUI tool. During normal operation, TST must be grounded; leaving it floating may cause undefined behavior or failure to initialize.

How does the FG/RD pin operate in rotor lock detection mode?

When configured as RD (rotor lock indicator) via FGRD_SEL = 11, the FG/RD pin outputs a static logic level during lock condition: high if RD_H_L = 1, low if RD_H_L = 0. Detection occurs after 0.6s of no Hall edge transition, triggering LS-FET activation and auto-restart after LOCK_SEL–defined recovery time. No external circuitry is needed beyond the required external pull-up resistor.

Can MP6616GD-0000-Z operate without an external OSC resistor?

No. The OSC pin requires a 20kΩ ±1% resistor connected to GND to establish the 27kHz internal clock. Omitting this resistor disables oscillator function, preventing proper Hall sampling, PWM timing, and commutation sequencing. The resistor must be placed close to the IC and routed away from noisy power traces to avoid frequency instability.

What is the maximum allowable Hall sensor magnetic field strength for reliable operation?

The MP6616GD-0000-Z Hall sensor is specified for ±2mT minimum sensitivity but has no defined upper limit in the datasheet. Practical operation remains stable up to ±15mT based on typical ferrite magnet flux densities and die placement (z = 370μm). Exceeding ±20mT may saturate the Hall element, causing commutation errors or missed transitions - verify with actual magnet geometry and air gap during validation.

Does MP6616GD-0000-Z support bidirectional motor rotation?

No. The MP6616GD-0000-Z is designed exclusively for unidirectional single-phase BLDC operation. Its Hall-based commutation logic and OUT1/OUT2 drive sequence assume fixed magnetic pole orientation and forward rotation. Reverse drive is not supported by hardware or register configuration; attempting reverse operation may cause erratic behavior or device latch-up.

How is thermal performance affected by the QFN-10 package's exposed pad?

The exposed thermal pad on the QFN-10 package reduces θ_JA from 65°C/W to ~35°C/W when soldered to ≥2cm² of 2oz copper with 4+ thermal vias. This enables sustained 2A output at 125°C ambient without derating, provided the pad is fully connected to a solid ground plane. Inadequate pad connection increases junction temperature by >25°C, risking premature thermal shutdown.

What protection features activate during input over-voltage events?

At V_CC > 19V (OVP rising threshold), both HS-FETs turn off and LS-FETs turn on to clamp the motor back-EMF path, limiting power dissipation. Operation resumes automatically once V_CC drops below 18V (1V hysteresis). This protects internal MOSFETs and gate drivers without requiring external TVS devices, though a 15V clamping diode is still recommended for large-inductance fan loads.