Monolithic Power Systems Inc. MP6652GJS-0000-Z

Overview

MP6652GJS-0000-Z from Monolithic Power Systems is a single-phase brushless DC (BLDC) motor driver IC with integrated Hall-effect sensor, 850mΩ HS/LS MOSFETs, and configurable speed curve control. It operates from 3V to 18V input, delivers fixed 27kHz switching frequency, and supports PWM-based speed regulation for cooling fans in CPU/GPU thermal management systems.

For engineers reviewing the MP6652GJS-0000-Z datasheet, MP6652GJS-0000-Z pinout, MP6652GJS-0000-Z application, or MP6652GJS-0000-Z equivalent, key selection criteria include integrated Hall sensing, rotor lock auto-recovery, FG/RD dual-mode output, soft-on/off commutation angle configuration, and TSOT23-6-SL package compatibility with space-constrained fan modules.

Technical Context

The MP6652 implements closed-loop commutation using an on-die Hall sensor that detects rotor position, generating HA_IN which is phase-shifted via HAL_ANG register to produce HA_OUT for precise timing control of OUT1/OUT2 H-bridge outputs. Commutation logic enforces soft-on (θSON up to 90°) and soft-off (θSOFF up to 90°) transitions to reduce acoustic noise and mechanical stress.

Speed regulation uses an 8-point programmable duty-cycle lookup table (D1–D8 registers), mapping 12.5%–100% input PWM duty to corresponding output duty, while DOUT_MIN and DIN_MIN set minimum operational thresholds. FG/RD pin provides selectable 0.5x/1x/2x Hall frequency or rotor lock indication with RD_HL polarity control.

Key Specifications

Pinout & Package

MP6652GJS-0000-Z is housed in a TSOT23-6-SL package - a 6-pin, surface-mount, lead-free, halogen-free package with 0.95mm pitch and exposed thermal pad (not electrically connected). Dimensions: 2.9mm × 1.6mm × 0.85mm (max height).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP6651GJS-Z and A89335KESJTR-T, MP6652GJS-0000-Z uniquely integrates Hall sensing and offers full-speed-curve programmability, enabling quieter, more responsive thermal management in space-limited fan modules without external components.

Availability

MP6652GJS-0000-Z is available at Aetrix Electronics and suitable for CPU fan control, GPU thermal management, and server chassis cooling applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP6652GJS-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 centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP6652 belongs to MPS's fan driver product line, engineered specifically for intelligent, low-noise, single-phase BLDC cooling solutions in computing, communications, and industrial equipment where integration, configurability, and reliability are critical.

FAQ

What is the function of the FG/RD pin, and how is its mode selected?

The FG/RD pin serves dual roles: as a tachometer output (FG) providing 0.5x, 1x, or 2x the Hall sensor frequency, or as a rotor lock indicator (RD) signaling stalled motor condition. Mode selection is controlled by the FGRD[1:0] bits in Register 0Eh: 00 = 1x, 01 = 0.5x, 10 = 2x, 11 = RD. When in RD mode, output polarity is set by RD_HL bit in Register 0Ch.

Does MP6652GJS-0000-Z require external current-sense resistors for over-current protection?

No. MP6652GJS-0000-Z implements internal high-side current sensing for over-current protection (OCP) with a typical threshold of 1.3A. The OCP_SEL[1:0] bits in Register 0Dh allow selection among four thresholds (0.45A, 0.8A, 1.1A, 1.3A), eliminating need for external sense resistors or amplifiers.

How is the soft-start transition time configured, and what is its impact on inrush current?

The soft-start (SS) time is set via T_SS[1:0] bits in Register 0Eh, selecting 2.4s, 4.8s, 7.2s, or 9.6s for full 0%→100% duty cycle ramp. This gradual voltage ramp limits peak inrush current during fan startup, reducing stress on input capacitors and upstream power supplies without requiring external timing components.

Can MP6652GJS-0000-Z drive motors other than axial fans, such as radial blowers or pumps?

Yes - it can drive any single-phase BLDC motor with compatible voltage/current ratings (≤18V, ≤1.3A continuous). However, its optimized Hall offset angle (2.8°–45°), soft-commutation parameters, and 8-point curve are tuned for axial fan dynamics. Radial blowers or pumps may require register reconfiguration and validation of mechanical resonance behavior.

What is the significance of the "-0000" suffix in MP6652GJS-0000-Z, and is it programmable post-manufacture?

The "-0000" denotes the default factory-programmed OTP configuration code, setting registers to nominal values (e.g., DOUT_MIN=0x20, SON_ANG=0x10). While OTP memory is one-time programmable, the device supports in-system register writes via test mode and MPS Fan Driver GUI software, allowing field updates before final NVM burn-in.

Is thermal derating required when operating at 125°C ambient temperature?

Yes. At TA = 125°C, the maximum allowable power dissipation drops to PD(MAX) = (150°C − 125°C) / 100°C/W = 0.25W. With typical R_DS(ON) of 850mΩ and 500mA load, power loss is ~0.21W - within limit. However, PCB copper area and airflow must ensure θJA remains near 100°C/W; insufficient heatsinking risks thermal shutdown.

How does the MP6652 handle reverse polarity or hot-plug events on the VCC pin?

MP6652GJS-0000-Z has no reverse-polarity protection. A series Schottky diode or ideal diode controller is required for reverse blocking. For hot-plug, UVLO (2.5V rising) and soft-start prevent inrush; however, external input clamping (e.g., 15V SOD-123 TVS) is recommended to absorb motor back-EMF spikes during sudden disconnect.