Monolithic Power Systems Inc. MP6532GF-Z

Overview

MP6532GF-Z from Monolithic Power Systems is a three-phase BLDC motor pre-driver IC designed to control six external N-channel MOSFETs in half-bridge configurations for 5V–60V motor supply rails. It integrates 120° Hall-sensor commutation logic, charge-pump–boosted VREG (11.5V typ), bootstrap high-side drivers with trickle-charge support for 100% duty cycle, and programmable short-circuit/over-current protection. Used in power tools like impact drivers and e-bike controllers where robust gate drive and fault resilience are critical.

For engineers reviewing the MP6532GF-Z datasheet, MP6532GF-Z pinout, MP6532GF-Z application, or MP6532GF-Z equivalent, key selection considerations include its 28-pin TSSOP-EP package with exposed thermal pad, 0.8A source / 1A sink gate drive capability, adjustable dead time via RDT resistor, integrated LSS-based OCP, and open-drain nFAULT reporting for real-time system-level fault handling.

Technical Context

The MP6532GF-Z implements a fully integrated three-phase gate driver architecture with internal charge pump (110kHz) generating regulated 11.5V VREG for low-side drive and bootstrap-assisted high-side drive. Its commutation engine accepts three Hall sensor inputs (HA/HB/HC) and executes deterministic 120° sequencing independent of microcontroller intervention.

Protection subsystems include VDS-based short-circuit detection referenced to OCREF (0.125V–2.4V), LSS shunt-based over-current protection with 53–80µs fixed off-time, UVLO on VIN (3.3–4.5V rising threshold), and thermal shutdown at 150°C. All protections latch until reset by nSLEEP or VIN UVLO recovery.

Key Specifications

Pinout & Package

TSSOP-28 EP package (9.7mm × 6.4mm) with exposed thermal pad connected to GND for enhanced power dissipation (θ_JA = 32°C/W, θ_JC = 6°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STSPIN32F0A and DRV8313, the MP6532GF-Z delivers standalone Hall-commutated pre-driving with 5V start-up, integrated VREG generation, and hardware-enforced protection - making it optimal for cost-sensitive, firmware-light power tool and e-mobility applications where deterministic timing and supply flexibility are essential.

Availability

MP6532GF-Z is available at Aetrix Electronics and suitable for power drills, impact drivers, e-bike mid-drive controllers, and industrial fan actuators requiring stable component supply, full production traceability, and long-term lifecycle support.

Supply support for MP6532GF-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 a focus on energy-efficient power management solutions.

The MP6532 belongs to MPS's motor driver pre-driver product line, engineered specifically for cost-effective, robust control of three-phase BLDC motors in portable and industrial equipment where Hall-sensor commutation and wide-input-voltage operation are mandatory.

FAQ

What is the minimum input voltage required for MP6532GF-Z to operate?

The MP6532GF-Z starts functional operation when VIN exceeds the UVLO rising threshold of 3.3V–4.5V, but guaranteed gate drive performance (including VREG regulation and full 0.8A/1A drive strength) begins at 5V. Below 5V, VREG drops below 10V and gate drive current degrades, limiting MOSFET switching capability.

How does the trickle-charge circuit enable 100% duty cycle operation?

The internal trickle-charge circuit supplies ~5µA to each bootstrap node (BSTA/BSTB/BSTC) to counteract leakage currents that would otherwise discharge the bootstrap capacitors during sustained high-side conduction. This maintains sufficient gate-source voltage (>8V) on high-side MOSFETs even when driven continuously high, eliminating need for external charge pumps.

Can MP6532GF-Z be used without Hall sensors?

No - the MP6532GF-Z requires valid HA/HB/HC Hall inputs to execute its built-in 120° commutation logic. It has no sensorless BEMF detection circuitry. For Hall-less operation, an external microcontroller must generate gate drive signals, and the MP6532GF-Z would function only as a three-phase gate driver without commutation.

What is the purpose of the LSS pin and how is it configured for over-current protection?

The LSS pin monitors voltage across an external low-side shunt resistor. When LSS voltage exceeds 0.4–0.6V (VLSS threshold), the corresponding high-side FET turns off and low-side FET turns on for 53–80µs (tOFF). To disable OCP, connect LSS directly to ground and tie all low-side MOSFET sources to GND.

Is the nFAULT output compatible with 3.3V microcontrollers?

Yes - nFAULT is an open-drain output with ≤0.5V low-level voltage at 5mA sink current. A 10kΩ pull-up to 3.3V yields <0.33mA leakage current when high, ensuring clean logic-level signaling to 3.3V MCUs without level-shifting.

What thermal derating applies to the TSSOP-28 EP package at 85°C ambient?

With θ_JA = 32°C/W and maximum junction temperature T_J(MAX) = 150°C, allowable power dissipation at T_A = 85°C is (150 − 85)/32 ≈ 2.03W. This is below the 3.9W rating at 25°C, confirming need for thermal relief (e.g., copper pour, airflow) in high-ambient environments.

How is dead time adjusted and what is the minimum usable value?

Dead time is set by connecting a resistor (RDT) from DT pin to GND. Equation t_DEAD(ns) = 3.7 × R(kΩ) applies for RDT > 0Ω. Minimum dead time is 30ns when DT is tied directly to GND - sufficient for fast-switching MOSFETs with low gate charge and minimal layout parasitics.