Monolithic Power Systems Inc. MP6522GU-Z

Overview

MP6522GU-Z from Monolithic Power Systems is a 35V, 3.2A H-bridge motor driver IC designed to control DC brush motors and solenoids in industrial actuators and robotic joints. It integrates four N-channel MOSFETs with matched 300mΩ high-side and low-side R_DS(on), delivers cycle-by-cycle current regulation without external shunt resistors, and features integrated current-sense output (VISEN) scaling via ISET pin. Its QFN-24 (5mm×5mm) package supports thermally demanding motor-control PCB layouts.

For engineers reviewing the MP6522GU-Z datasheet, MP6522GU-Z pinout, MP6522GU-Z application, or MP6522GU-Z equivalent, key selection criteria include its 5.4–35V input range, ±3.2A peak output capability, internal OCP/OVP/UVLO/thermal shutdown protection, fault-indication open-drain nFAULT output, and compatibility with 3.3V/5V logic interfaces in space-constrained motion-control designs.

Technical Context

The MP6522GU-Z implements constant-off-time PWM current regulation using internal sensing of low-side MOSFET conduction, with trip threshold set by VISEN = 1.5V (rising) and hysteresis at 1.2V (falling). Current limit is programmable via external resistor on ISET, sourcing 100µA per ampere of load current.

Its gate drive architecture uses an internal charge pump (660kHz) to sustain high-side N-MOSFET operation across the full 5.4–35V VIN range. Fault management includes independent over-current protection (IOCP1/IOCP2 = 3.2–5.2A), input OVP (36–40V), UVLO (5.1–5.3V with 310mV hysteresis), and thermal shutdown (T_TSD = 165°C with 30°C hysteresis), all asserting open-drain nFAULT.

Key Specifications

Pinout & Package

MP6522GU-Z is housed in a thermally enhanced 24-pin QFN package (5mm × 5mm, 0.5mm pitch) with an exposed thermal pad (EP) that must be soldered to system ground for effective heat dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TB6612FNG and VNH7040AS, MP6522GU-Z uniquely balances wide 5.4–35V operation, integrated current sensing (VISEN), and thermally efficient QFN packaging - making it optimal for industrial and medical motion-control designs where board space, thermal headroom, and analog feedback simplicity are critical.

Availability

MP6522GU-Z is available at Aetrix Electronics and suitable for industrial actuators, robotic joint drivers, automotive HVAC dampers, and medical infusion pumps requiring stable component supply across extended production lifecycles.

Supply support for MP6522GU-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 core expertise in DC/DC conversion, motor control, and LED drivers.

The MP6522 belongs to MPS's H-bridge motor driver product line, engineered specifically for compact, thermally constrained DC motor applications in industrial automation, robotics, and precision medical devices where integrated sensing and robust protection are essential.

FAQ

What is the maximum allowable continuous output current for MP6522GU-Z at 70°C ambient temperature?

The MP6522GU-Z supports up to 2.2A continuous output current at 70°C ambient when mounted on a 4-layer PCB with the exposed thermal pad fully soldered to ≥2cm² of inner-layer ground copper. This derating accounts for θ_JA = 36°C/W and maximum junction temperature of 125°C under steady-state conditions.

Can MP6522GU-Z drive a stepper motor in bipolar mode?

No, MP6522GU-Z is not designed for stepper motor control. It lacks microstepping, phase sequencing logic, or dual-H-bridge topology required for bipolar stepper operation. It is optimized for single DC brush motor or solenoid control with forward/reverse/brake/coast states.

How is the current limit threshold set, and what resistor value yields 2A full-scale current?

The current limit is set by connecting a resistor R_ISET between ISET and GND. With 100µA sourced per ampere, a 5kΩ resistor sets VISEN = 1V at 1A → 2V at 2A, triggering regulation at 2A (since VITRIP-R = 1.5V). Thus, R_ISET = 1.5V / 100µA = 15kΩ yields 1.5A full-scale; for 2A, use 7.5kΩ to reach 1.5V at 2A.

Does nFAULT assert during normal PWM current limiting?

No, nFAULT remains high during cycle-by-cycle current regulation. It only pulls low during hard faults: over-current events exceeding IOCP1/IOCP2 thresholds for >500ns, input over-voltage (>36V), under-voltage (<5.1V), or die temperature >165°C - distinguishing protection faults from intended regulation behavior.

What is the recommended capacitor configuration for the charge pump network?

Use two 100nF X7R ceramic capacitors: one between CPA and CPB (flying capacitor), and another between VCP and VIN (bootstrap capacitor). Both must be placed within 2mm of their respective pins with low-inductance traces to ensure stable high-side gate drive across the full 5.4–35V input range.

Is MP6522GU-Z RoHS-compliant and halogen-free?

Yes, MP6522GU-Z is lead-free, halogen-free, and fully compliant with the EU RoHS directive. MPS confirms green status for this part on its official Quality Assurance webpage, with material declarations available upon request for full supply chain traceability.