Monolithic Power Systems Inc. MP6529GF-P

Overview

MP6529GF-P 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), adjustable dead-time control, UVLO, thermal shutdown, and open-drain fault reporting. Used in cordless power tools like impact drivers and e-bikes.

For engineers reviewing the MP6529GF-P datasheet, MP6529GF-P pinout, MP6529GF-P application, or MP6529GF-P equivalent, key selection criteria include bootstrap-based high-side drive capability, VDS-sensing OCP with 0.5V LSS threshold, 1ms sleep wake-up latency, 6µs default dead time, and TSSOP-28 EP thermal pad layout for motor control PCBs.

Technical Context

The MP6529GF-P implements a three-phase gate driver architecture with independent ENA/ENB/ENC enables per phase and synchronized PWM inputs (PWMA/PWMB/PWMC) for commutation control. Its charge pump generates BSTA/BSTB/BSTC voltages up to 55V for high-side N-MOSFET drive, while internal trickle-charge sustains gate voltage during continuous conduction.

OCP uses dual sensing: external OC_REF voltage sets VDS trip threshold (0.8–2.62V range), and LSS pin monitors low-side source current with fixed 0.5V threshold. Fault latching requires nSLEEP or UVLO reset, and nFAULT provides open-drain status signaling with <0.5V low-level output at 5mA sink.

Key Specifications

Pinout & Package

TSSOP-28 EP (9.7mm × 6.4mm) with exposed thermal pad - optimized for surface-mount motor control PCBs requiring moderate power dissipation (3.9W at 25°C ambient) and manual rework accessibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP6532GF-Z and DRV8305PWP, the MP6529GF-P prioritizes analog simplicity, ultra-low sleep current, and direct LSS-based OCP-making it optimal for cost-sensitive, battery-powered power tools where fast hardware fault response outweighs digital configurability.

Availability

MP6529GF-P is available at Aetrix Electronics and suitable for cordless power tools, e-bike motor controllers, portable medical pumps, and consumer appliance BLDC drives requiring stable component supply and long-term production support.

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

The MP65xx series targets cost-effective, thermally robust three-phase BLDC pre-driver solutions for portable and industrial motor control, emphasizing analog protection integration, wide input range, and minimal external components.

FAQ

What is the purpose of the LSS pin on MP6529GF-P?

The LSS (Low-Side Source) pin monitors the voltage drop across the low-side MOSFET's source terminal to detect over-current conditions. When the voltage exceeds 0.5V, the device triggers latched OCP and pulls nFAULT low. This enables fast, hardware-based short-circuit protection without requiring external current-sense resistors or amplifiers.

How does the MP6529GF-P support 100% duty cycle operation?

It uses an internal trickle-charge circuit that periodically replenishes the bootstrap capacitor during sustained high-side conduction. Unlike basic bootstrap designs that fail at 100% duty, this feature maintains sufficient gate drive voltage on BSTA/BSTB/BSTC pins without needing a charge pump or isolated supply, simplifying PCB layout.

Can MP6529GF-P drive both N-channel and P-channel high-side MOSFETs?

No-it is designed exclusively for N-channel high-side MOSFETs using bootstrap gate drive. The architecture relies on floating high-side sources (SHA/SHB/SHC) and bootstrap capacitors (CPA/CPB) to generate gate-to-source voltage above the source potential. P-channel devices are not supported.

What is the minimum recommended dead time when DT is left unconnected?

When the DT pin is left open (floating), the MP6529GF-P defaults to a 6µs dead time between high-side turn-off and low-side turn-on. This value is internally generated and provides robust shoot-through prevention for typical 20–50kHz BLDC PWM frequencies without external resistor biasing.

Does MP6529GF-P require external bootstrap diodes?

No-the device integrates internal bootstrap diodes with forward voltage of 0.9V at 10mA and 1.3V at 100mA. These diodes charge the external bootstrap capacitors (CPA/CPB/CPC) from VREG, eliminating the need for discrete diodes and reducing component count and board area.

How is thermal shutdown reset after activation?

Thermal shutdown causes a latched fault condition: all outputs disable and nFAULT pulls low. Recovery requires either cycling nSLEEP (pull low then high) or allowing VIN to fall below UVLO threshold (~3.3V) and rise again. No automatic reset occurs once temperature drops-ensuring safe re-enable only after system intervention.

What is the function of the VREG pin?

VREG (Pin 4) is a regulated 10–12.8V output used to power external bootstrap capacitors and optionally supply logic-level circuitry. It draws from VIN and regulates independently, providing stable gate drive voltage even as input varies from 5V to 35V-critical for consistent MOSFET enhancement across battery discharge curves.