Monolithic Power Systems Inc. MP6529GR-P

Overview

MP6529GR-P from Monolithic Power Systems is a three-phase brushless DC motor pre-driver IC designed to control six external N-channel MOSFETs in half-bridge configurations, operating from 5V to 35V input supply, delivering 0.8A source / 1A sink gate drive current, with programmable over-current protection and adjustable dead-time control for power drills and e-bikes.

For engineers reviewing the MP6529GR-P datasheet, MP6529GR-P pinout, MP6529GR-P application, or MP6529GR-P equivalent, key selection considerations include bootstrap-based high-side drive capability at 100% duty cycle, VDS-sensing OCP with 0.5V LSS threshold, thermal shutdown at 150°C, and compatibility with QFN-28 (4mm×4mm) thermally enhanced package.

Technical Context

The MP6529GR-P implements a charge-pump-assisted bootstrap architecture to sustain high-side gate drive voltage across full-duty-cycle operation, supported by an internal trickle-charge circuit. It integrates independent enable inputs (ENA/ENB/ENC) per phase and open-drain fault reporting via nFAULT.

OCP uses dual sensing: programmable reference voltage (OC_REF, 0.125V–2.4V) for VDS-based current limit and fixed 0.5V threshold on LSS pin for low-side current monitoring. Dead time is resistor-adjustable (RDT) from 30ns to 6µs, with internal deglitching (3µs) to suppress switching transients.

Key Specifications

Pinout & Package

MP6529GR-P is housed in a 28-contact QFN package (4mm × 4mm) with exposed thermal pad for enhanced power dissipation (θJA = 42°C/W, PD(MAX) = 2.9W at TA = 25°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with DRV8305PWP and STSPIN32F0A, MP6529GR-P offers higher gate drive current (1A sink), simpler analog OCP tuning via OC_REF, and lower sleep current (1µA), making it optimal for cost-sensitive, battery-powered tools where discrete MCU control and analog protection tuning are preferred.

Availability

MP6529GR-P is available at Aetrix Electronics and suitable for power drills, impact drivers, and e-bike mid-drive systems requiring stable component supply, consistent thermal performance, and long-term production continuity.

Supply support for MP6529GR-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 MP6529 belongs to MPS's motor driver pre-driver product line, engineered specifically for compact, battery-powered three-phase BLDC applications demanding high efficiency, robust protection, and minimal external components.

FAQ

What is the function of the OC_REF pin on MP6529GR-P?

The OC_REF pin sets the over-current protection threshold for VDS-based current limiting. Applying a reference voltage between 0.125V and 2.4V configures the OCP trip point proportionally-e.g., 1.0V input yields ~2× sensitivity versus 0.5V-enabling precise matching to external MOSFET RDS(on) and desired current limit.

How does MP6529GR-P support 100% duty cycle operation?

It uses an internal trickle-charge circuit that periodically replenishes the bootstrap capacitor during sustained high-side conduction, maintaining sufficient gate drive voltage without requiring external charge-pump circuitry or auxiliary supply rails.

Can MP6529GR-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 periodic low-side conduction to recharge the bootstrap capacitor; P-channel devices are not supported due to lack of integrated high-voltage level-shifting or dedicated source drivers.

What is the purpose of the LSS pin and its 0.5V OCP threshold?

LSS is the common low-side source node for all three phases. Its 0.5V OCP threshold provides a fixed, temperature-stable current limit independent of MOSFET characteristics-ideal for detecting hard short-circuits or mechanical stalls where VDS sensing may be delayed or inaccurate.

Is the nFAULT output latched or auto-recovering after a fault event?

nFAULT is latched: once triggered by OCP or thermal shutdown, it remains low until the device resets via nSLEEP deassertion or VIN recovering above UVLO threshold. This ensures fault persistence for system-level diagnostics and prevents uncontrolled restarts during hazardous conditions.

What thermal performance can be expected in the QFN-28 package?

In standard JEDEC 4-layer PCB layout, the QFN-28 package delivers θJA = 42°C/W and maximum continuous power dissipation of 2.9W at 25°C ambient. With proper thermal pad soldering and copper pour, junction temperature rise stays within safe limits up to ~2.2W under typical 24V/10A motor drive conditions.