Monolithic Power Systems Inc. MP6535GU-P

Overview

MP6535GU-P from Monolithic Power Systems is a three-phase brushless DC motor pre-driver IC with integrated 500mA buck regulator and 120° Hall-sensor commutation logic. It drives six external N-channel MOSFETs across 5V–55V input, supports 100% duty cycle via trickle-charged bootstrap, and delivers 0.8A source / 1A sink gate drive per channel. Used in e-bike motor controllers where compact high-voltage motor control and local MCU power generation are required.

For engineers reviewing the MP6535GU-P datasheet, MP6535GU-P pinout, MP6535GU-P application, or MP6535GU-P equivalent, key selection criteria include its 55V max VIN rating, programmable dead-time control, VDS-based short-circuit protection, integrated buck output (10–12.8V), and Hall-input commutation timing behavior under 100% PWM duty cycle.

Technical Context

The MP6535GU-P implements dual independent power domains: a motor pre-driver stage using charge-pump-regulated VREG (11.5V typ.) for low-side gates and bootstrap + trickle-charge circuitry for high-side gate drive, enabling continuous conduction without gate voltage collapse. Its 120° commutation engine accepts three Hall sensor inputs and executes phase sequencing with fixed 1.8µs automatic low-side turn-on time before each commutation edge.

Its integrated current-mode buck regulator operates at 330–570kHz, features foldback frequency reduction during short-circuit faults, and uses an external REN resistor for auto-enable. Protection architecture includes UVLO on VIN (3.3–4.5V rising threshold), thermal shutdown at 150°C, and separate over-current detection paths-VDS sensing (via OCREF) and low-side shunt sensing (via LSS)-each with configurable deglitch (3µs) and latched fault response.

Key Specifications

Pinout & Package

MP6535GU-P is housed in a thermally enhanced 40-pin QFN package (5mm × 5mm) with exposed thermal pad for PCB-level heat dissipation. Pin assignment follows MPS standard layout optimized for three-phase gate drive routing and buck regulator decoupling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DRV8305PAPR and STSPIN32F0A, MP6535GU-P uniquely combines Hall-input commutation, 55V operation, integrated buck regulator, and dual-path OCP - making it optimal for Hall-sensored, self-contained motor modules requiring local power and deterministic fault response.

Availability

MP6535GU-P is available at Aetrix Electronics and suitable for e-bike controllers, power tools, industrial pumps, and automated gate systems requiring stable component supply across automotive-grade temperature range (-40°C to +125°C) and long-lifecycle production.

Supply support for MP6535GU-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 core expertise in DC/DC conversion, motor control, and power management solutions.

The MP6535 product line targets cost-sensitive, high-reliability BLDC motor control applications where integration of gate driving, commutation logic, and local power generation reduces system size and design complexity.

FAQ

What is the maximum allowable VIN transient voltage for MP6535GU-P?

The absolute maximum VIN rating is 65V, and transients exceeding this-even briefly-risk permanent damage. For systems with regenerative braking (e.g., e-bikes), a TVS diode rated ≤60V clamping voltage must be placed between VIN and GND to absorb energy and hold voltage within safe limits during load dump events.

How does the trickle-charge circuit maintain high-side gate voltage at 100% duty cycle?

The internal trickle-charge pump supplies ~5µA to each bootstrap capacitor during high-side conduction, compensating for leakage currents that would otherwise discharge the capacitor. This maintains V_BST ≥ V_REG – 1.3V, ensuring reliable high-side FET turn-on even with no low-side conduction window for recharge.

Can MP6535GU-P operate without Hall sensors?

No. The MP6535GU-P requires three active Hall sensor inputs (HA/HB/HC) for commutation; it has no sensorless BEMF detection circuitry. Attempting operation without valid Hall signals results in undefined gate drive states and potential shoot-through. For sensorless applications, consider alternatives like STSPIN32F0A or TI DRV10983.

What is the recommended dead-time resistor value for 200ns dead time?

Using t_DEAD(ns) = 3.7 × R(kΩ), a 200ns dead time requires R_DT ≈ 54kΩ. A standard 56kΩ ±1% resistor yields 207ns, well within typical MOSFET gate charge requirements. Values below 200kΩ are recommended to avoid noise sensitivity; tie DT to GND only if minimum 30ns dead time suffices.

Does the buck regulator support adjustable output voltage?

Yes. The buck output voltage is set by an external resistor divider on RFB: V_OUT = 0.812V × (1 + R1/R2). With standard 1% resistors, outputs from 3.3V to 12V are achievable. The feedback reference is trimmed to ±2.5% over temperature, ensuring stable MCU supply across -40°C to +125°C.

How is thermal shutdown reset after triggering?

Thermal shutdown is latched: once die temperature exceeds 150°C, all outputs disable and nFAULT pulls low. Recovery requires either cycling VIN below UVLO (≤3.3V) or asserting nSLEEP low then high. No automatic recovery occurs - this prevents unsafe restart during overheating conditions.

Is MP6535GU-P RoHS-compliant and halogen-free?

Yes. MP6535GU-P is lead-free, halogen-free, and fully compliant with EU RoHS Directive 2011/65/EU. Full material declarations and green status documentation are available on the Monolithic Power Systems website under Quality Assurance.