Monolithic Power Systems Inc. MP6538GV-P

Overview

MP6538GV-P from Monolithic Power Systems is a 100V three-phase BLDC motor pre-driver IC with integrated Hall-sensor interface, programmable over-current protection (OCP), adjustable dead-time control (560ns–4.5µs), and internal charge pump for sustained high-side gate drive. It drives six N-channel MOSFETs in half-bridge configuration and supports motor control via PWM, DIR, and nBRAKE inputs in power drills, e-bikes, and industrial fans.

For engineers reviewing the MP6538GV-P datasheet, MP6538GV-P pinout, MP6538GV-P application, or MP6538GV-P equivalent, this page delivers verified technical context on Hall-based commutation logic, bootstrap/charge-pump operation, OCP threshold programming via OCREF, thermal shutdown behavior at 175°C, and QFN-28 package layout with exposed thermal pad.

Technical Context

The MP6538GV-P implements Hall-sensor-based 120° commutation using HA/HB/HC inputs to determine rotor position and sequence gate drive outputs across three phases. Its control logic integrates PWM modulation, direction selection (DIR), and active-low braking (nBRAKE) to manage speed, torque, and stall recovery.

Gate drive architecture combines bootstrap capacitor charging (with VBST up to 120V) and an internal charge pump to sustain high-side drive during extended high-state periods. Protection circuitry includes dual UVLO thresholds (VIN: 3.6–4.4V rising; VREG: 6.5–8.5V rising), OCP with 2.7µs deglitch, and latched thermal shutdown at 175°C with 20°C hysteresis.

Key Specifications

Pinout & Package

MP6538GV-P is housed in a thermally enhanced QFN-28 (4mm × 5mm) package with exposed thermal pad for efficient heat dissipation in motor driver PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STSPIN32F0A, MP6538GV-P offers deterministic hardware-based Hall commutation and integrated current sensing without firmware overhead; compared with TB6605FTG, it adds charge pump support and programmable OCP for robust motor protection in demanding loads.

Availability

MP6538GV-P is available at Aetrix Electronics and suitable for power drills, e-bikes, and industrial fans requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.

Supply support for MP6538GV-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.

The MP6538 belongs to MPS's motor driver product line, engineered specifically for cost-effective, Hall-sensor-based BLDC control in battery-powered and industrial motion systems.

FAQ

What is the maximum continuous bus voltage the MP6538GV-P can handle?

The MP6538GV-P supports a maximum input voltage (VIN) of 100V, with absolute maximum ratings up to 110V. Its bootstrap pins (BSTA/B/C) tolerate up to 120V, enabling safe operation in 48V, 60V, and 96V battery systems with headroom for voltage spikes and ringing.

How does the MP6538GV-P prevent shoot-through in the three-phase bridge?

It uses an external resistor (RDT) tied between pin 28 (DT) and GND to set dead time from 77ns to 4.5µs across all phases. This blanking interval ensures high-side and low-side FETs in each half-bridge never conduct simultaneously, avoiding destructive shoot-through current.

Can the MP6538GV-P operate without external Hall sensors?

No - the MP6538GV-P requires three 120°-spaced Hall sensor inputs (HA, HB, HC) to determine rotor position and execute commutation logic. It does not support sensorless (back-EMF) operation or alternative position feedback methods.

What is the role of the CSO pin beyond over-current protection?

CSO provides a ×20 amplified voltage of the LSS node, enabling real-time current monitoring for closed-loop torque control or diagnostic logging. When used with an RC network (≥1nF capacitor + ≥1kΩ resistor), it also sets OCP off-time duration per Equation (2) in the datasheet.

Does the MP6538GV-P require external components for bootstrap operation?

Yes - each phase requires an external bootstrap capacitor (typically 0.1µF ceramic) between BSTx and SHx pins. A Schottky diode (e.g., 1N5819) from VREG to BSTx is recommended to improve charge efficiency and reliability under high-duty-cycle conditions.

How is thermal shutdown reset after activation?

Thermal shutdown is latched: once die temperature exceeds 175°C, all outputs disable and nFAULT goes low. Recovery requires either cycling nSLEEP (pull low then high) or triggering a full UVLO event by dropping VIN below 3.4V and reapplying power above 4.4V.

Is the MP6538GV-P pin-compatible with other MPS motor drivers?

No - MP6538GV-P uses a unique 28-pin QFN layout optimized for Hall inputs, three-phase gate drive, and current sensing. It is not pin-compatible with MP6530, MP6532, or MP6535, which differ in feature set, pin count, and functional allocation.