Monolithic Power Systems Inc. MP6529GF-Z

Overview

MP6529GF-Z from Monolithic Power Systems is a three-phase brushless DC motor pre-driver IC designed to control six N-channel MOSFETs in half-bridge configurations across 5V–35V input rails; it delivers 0.8A source / 1A sink gate drive, supports 100% duty cycle via trickle-charged bootstrap, and integrates programmable over-current protection (OCP) with 0.5V LSS threshold for power drills and e-bike motor controllers.

For engineers reviewing the MP6529GF-Z datasheet, MP6529GF-Z pinout, MP6529GF-Z application, or MP6529GF-Z equivalent, key selection criteria include bootstrap-based high-side drive capability, adjustable dead-time control via external resistor, thermal shutdown at 150°C, and open-drain fault reporting with latched OCP behavior requiring nSLEEP or UVLO reset.

Technical Context

The MP6529GF-Z implements a charge-pump-assisted bootstrap architecture to sustain high-side gate voltage during continuous conduction, with internal trickle-charge circuitry enabling stable operation at 100% duty cycle. Its VDS-sensing OCP uses an externally set OC_REF voltage (0.125V–2.4V) and a fixed 0.5V LSS threshold to detect over-current events.

Dead time is configured by a single resistor (RDT) tied to DT pin, yielding 30ns (DT=GND), 6µs (DT=open), or 0.74µs (RDT=200kΩ); all three phases share this setting. Fault handling includes latched thermal shutdown and OCP, both signaled via open-drain nFAULT and cleared only by nSLEEP toggle or VIN UVLO recovery.

Key Specifications

Pinout & Package

TSSOP-28 EP (9.7mm × 6.4mm) with exposed thermal pad - optimized for surface-mount assembly and thermal dissipation in compact motor control PCBs; θJA = 32°C/W on 4-layer board.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP6530GF-Z and DRV8301DCA, the MP6529GF-Z delivers optimal balance of integration, thermal performance, and cost for mid-power portable BLDC applications-offering full protection and 100% duty-cycle support without added complexity or footprint.

Availability

MP6529GF-Z is available at Aetrix Electronics and suitable for power drills, impact drivers, and e-bike motor controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP6529GF-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 analog and power ICs, with design centers in the US, China, and Taiwan.

The MP65xx series targets portable and battery-powered motor control, emphasizing low quiescent current, robust protection, and compact thermally enhanced packages for space-constrained applications.

FAQ

What is the purpose of the nSLEEP pin, and how does it affect device startup?

The nSLEEP pin enables ultra-low-power sleep mode when driven low, reducing supply current to 1µA and disabling all gate drivers and logic. To exit sleep, nSLEEP must be driven high, followed by a mandatory 1ms stabilization delay before issuing PWM commands-ensuring internal regulators and charge pumps reach steady state.

How is over-current protection implemented, and what triggers a latched fault?

OCP uses dual detection: VDS sensing via OC_REF voltage (0.125V–2.4V) and fixed 0.5V threshold on LSS pin. When either condition is exceeded, the device enters latched fault mode-disabling all outputs and pulling nFAULT low. Recovery requires toggling nSLEEP or cycling VIN through UVLO, preventing automatic restart after fault.

Can MP6529GF-Z drive 35V-rated MOSFETs in a 35V system without additional level-shifting?

Yes-the MP6529GF-Z supports VIN up to 35V and features bootstrap-based high-side gate drive with BSTA outputs rated to 55V. Its internal charge pump and trickle-charge circuit maintain sufficient gate voltage for high-side N-MOSFETs even at 100% duty cycle, eliminating need for external level shifters in 35V systems.

What is the function of the DT pin, and how does resistor value affect dead time?

The DT pin sets dead time for all three phases using an external resistor to ground. Dead time follows tDEAD(ns) = 3.7 × R(kΩ); for example, 200kΩ yields 0.74µs. Leaving DT open gives 6µs; tying directly to GND applies minimum 30ns. This single-point adjustment simplifies layout versus per-phase dead-time tuning.

Does MP6529GF-Z require external bootstrap diodes, and what is the forward voltage specification?

No external bootstrap diodes are required-the MP6529GF-Z integrates internal bootstrap diodes with forward voltage of 0.9V at 10mA and 1.3V at 100mA. These diodes charge the external bootstrap capacitors (typically 0.1µF ceramic) and are rated for 55V reverse blocking, matching standard 35V-system requirements.

How does the VREG pin function, and what loads can it support?

VREG is an internal regulator output providing 10–12.8V (depending on VIN) to power external gate resistors, level-shifters, or logic. It sources up to 0.8A and is internally current-limited; recommended load is ≤100mA to avoid regulation drop. VREG start-up delay is 700µs after VIN exceeds UVLO threshold.

Is thermal pad soldering required for reliable operation in continuous-duty applications?

Yes-the TSSOP-28 EP package includes an exposed thermal pad that must be soldered to a PCB copper pour for effective heat dissipation. With proper thermal land pattern and 2oz copper, θJA drops to 32°C/W, enabling 3.9W continuous power dissipation at +25°C ambient-critical for sustained motor drive in power tools and e-bikes.