Monolithic Power Systems Inc. MP6522GU-P

Overview

MP6522GU-P from Monolithic Power Systems is a 35V, 3.2A H-bridge motor driver IC with integrated N-channel MOSFETs, internal current sensing (VISEN output), cycle-by-cycle PWM current regulation, and full protection (OCP/OVP/UVLO/thermal shutdown). It drives DC brush motors in industrial actuators and robotic joints requiring precise bidirectional control and fault-aware operation.

For engineers reviewing the MP6522GU-P datasheet, MP6522GU-P pinout, MP6522GU-P application, or MP6522GU-P equivalent, key selection criteria include its 5.4–35V input range, 300mΩ HS/LS R_ON, ISET-programmable current limit (1.5V trip), open-drain nFAULT signaling, and QFN-24 thermal pad layout for motor drive thermal management.

Technical Context

The MP6522GU-P implements a constant-off-time PWM controller that senses load current through low-side MOSFET conduction and triggers slow-decay mode when VISEN reaches 1.5V. Its charge pump (660kHz) sustains high-side gate drive up to 35V VIN without external bootstrap components.

Logic inputs (IN1/IN2) support four-mode operation-forward, reverse, brake, and coast-with internal 530kΩ pull-downs; nSLEEP enables <1µA quiescent sleep mode, and nFAULT signals OCP/OVP/OTP faults independently of current-limit events.

Key Specifications

Pinout & Package

MP6522GU-P is housed in a thermally enhanced 24-pin QFN package (5mm × 5mm) with an exposed thermal pad (EP) that must be soldered to a GND plane for effective heat dissipation and stable operation above 2A continuous load.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar H-bridge motor driver applications.

Compared with TB6612FNG and DRV8876N, MP6522GU-P uniquely balances wide 5.4–35V operation, ISET-programmable current sensing, and comprehensive fault coverage in a single QFN-24 package-making it optimal for industrial motion control where adaptability and reliability are prioritized over minimal BOM count.

Availability

MP6522GU-P is available at Aetrix Electronics and suitable for industrial linear actuators, robotic joint controllers, automated door lock mechanisms, and medical infusion pump drives requiring stable component supply across extended production lifecycles.

Supply support for MP6522GU-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 LED drivers.

The MP6522GU-P belongs to MPS's H-bridge motor driver product line, engineered for compact, efficient, and fault-resilient DC motor control in space-constrained industrial and medical equipment.

FAQ

What is the purpose of the ISET pin on MP6522GU-P?

The ISET pin sets the current-sense scaling factor by connecting a resistor to GND. It sources 100µA per ampere of load current, determining the VISEN output voltage (e.g., 10kΩ yields 1V/A) and the 1.5V current-trip threshold. This enables programmable over-current protection and analog current monitoring without external components.

How does MP6522GU-P handle thermal management?

MP6522GU-P integrates thermal shutdown at 165°C with 30°C hysteresis and relies on its exposed thermal pad (EP) soldered to a PCB GND plane. With θ_JA = 36°C/W, sustained operation above 2.5A requires a 4-layer board with adequate copper area under the EP to maintain junction temperature ≤125°C.

Does nFAULT assert during normal PWM current limiting?

No. The nFAULT pin is driven low only during hard fault conditions-over-voltage (VIN > 40V), over-temperature (>165°C), or over-current exceeding the OCP threshold (3.2–5.2A). It remains high during cycle-by-cycle current regulation, allowing simultaneous current control and fault monitoring.

Can MP6522GU-P drive inductive loads other than motors?

Yes. Its H-bridge architecture and protection features support solenoids, relays, and other inductive loads. The internal body diodes and slow-decay braking mode manage inductive kickback, while OCP and thermal shutdown prevent damage during high-duty-cycle or stalled conditions.

What is the role of the charge pump (CPA, CPB, VCP) pins?

These pins implement an internal 660kHz charge pump that generates a boosted gate-drive voltage for the high-side N-MOSFETs, enabling full 35V operation without external bootstrap components. CPA and CPB connect a 100nF flying capacitor; VCP connects a 100nF reservoir capacitor to VIN.

Is MP6522GU-P compatible with 3.3V microcontrollers?

Yes. Its logic inputs accept VIH ≥ 2.0V and VIL ≤ 0.8V, making them fully compatible with standard 3.3V CMOS outputs. No level-shifting circuitry is required, simplifying interface design with modern low-voltage MCUs and FPGAs.

How does the blanking time (tOCPD) improve reliability?

The 500ns internal blanking time disables current-sense comparison during MOSFET switching transitions, preventing false OCP trips caused by reverse-recovery current spikes or parasitic capacitance discharge. This ensures stable operation during PWM commutation without compromising fault detection speed.