Monolithic Power Systems Inc. MP6507GQ-Z

Overview

MP6507GQ-Z from Monolithic Power Systems is a bipolar stepper-motor driver IC integrating dual N-channel full-bridge MOSFETs, operating from 2.7V to 15V supply and delivering up to 700mA per channel. It features internal charge pump, 1.1mA quiescent current, thermal shutdown with over-temperature flag, and supports both external PWM and internal constant-off-time current control for POS printers and battery-powered cameras.

For engineers reviewing the MP6507GQ-Z datasheet, MP6507GQ-Z pinout, MP6507GQ-Z application, or MP6507GQ-Z equivalent, this page delivers verified package mapping (QFN-16, 3×3mm), confirmed pin functions including SENA/SENB current sense inputs and nSLEEP control, real-world decay mode configuration (slow/fast), and validated motor winding interface behavior under 100Hz step rates.

Technical Context

The MP6507GQ-Z implements two independent full-bridge drivers with integrated 460mΩ high-side and 395mΩ low-side MOSFETs at 25°C/5V, enabling bidirectional current control in each motor phase. Its internal charge pump sustains high-side gate drive across the full 2.7V–15V input range without external boost components.

Current regulation operates via either externally applied logic-level PWM signals on AIN1/AIN2/BIN1/BIN2 or internal constant-off-time (27µs) control using external sense resistors and a 185mV trip threshold. Blanking time (2.7µs) prevents false current-limit triggering during switching transitions.

Key Specifications

Pinout & Package

MP6507GQ-Z uses a thermally enhanced 3mm × 3mm QFN-16 package with exposed thermal pad soldered to PCB ground plane for optimal heat transfer. The package complies with JEDEC MO-220 VEED-4 and supports reflow soldering per IPC/JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bipolar stepper-motor driver applications.

Compared with TB6600HG and DRV8834, MP6507GQ-Z uniquely balances 700mA drive capability, 2.7–15V flexibility, and QFN-16 footprint-making it optimal for cost-sensitive, battery-operated motion systems where board area and external component count are constrained.

Availability

MP6507GQ-Z is available at Aetrix Electronics and suitable for POS printers, video security cameras, digital still cameras, and battery-powered toys requiring stable component supply across automotive-grade temperature ranges (-40°C to +85°C) and long-lifecycle production programs.

Supply support for MP6507GQ-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP6507 product line targets compact, energy-efficient motion control in consumer and industrial edge devices, emphasizing integration density, thermal robustness, and seamless compatibility with low-power MCUs.

FAQ

What is the maximum allowable motor supply voltage for MP6507GQ-Z?

The absolute maximum VIN rating is 18V, but the recommended operating range is 2.7V to 15V. Operation above 15V risks exceeding safe junction temperature limits under 700mA load, especially in the 3×3mm QFN package with θJA = 60°C/W. Derating is required beyond 15V per the Absolute Maximum Ratings table.

How does the internal charge pump function without external components?

The MP6507GQ-Z integrates a flying-capacitor charge pump that generates boosted gate drive voltage for the high-side N-MOSFETs. It requires only a single 10nF–100nF ceramic capacitor between BST and VIN pins - no inductors, diodes, or additional regulators are needed, enabling true single-supply operation down to 2.7V.

Can MP6507GQ-Z drive unipolar stepper motors?

No - MP6507GQ-Z is designed exclusively for bipolar stepper motors with center-tapped or dual-winding configurations. Its dual full-bridge topology cannot replicate the transistor array switching pattern required for unipolar 5-lead or 6-lead motors. Attempting unipolar use results in incorrect phase energization and potential current-limit faults.

What is the purpose of the FAULT pin's open-drain configuration?

The FAULT pin is open-drain to allow wired-OR fault bus implementation across multiple MP6507GQ-Z devices. A single pull-up resistor enables system-level fault detection without signal contention. When asserted low, it indicates active thermal shutdown or UVLO - not overcurrent alone - and remains latched until VIN recovers or junction cools below 150°C hysteresis threshold.

Is the nSLEEP pin compatible with standard 3.3V logic levels?

Yes - nSLEEP accepts 0.4V max for logic low and 2V min for logic high, making it directly compatible with 3.3V and 5V CMOS outputs. No level-shifting is required. Assertion of logic low reduces total supply current to 1µA, and wake-up latency is guaranteed at ≤1.5ms with 100nF BST capacitor, per the Electrical Characteristics table.

How does synchronous rectification improve efficiency during decay?

During slow-decay freewheeling, MP6507GQ-Z activates both low-side MOSFETs instead of relying on body diodes. This reduces forward voltage drop from ~0.7V (diode) to ~0.15V (R_DS(on)), cutting conduction loss by >75% and lowering junction temperature rise by up to 8°C at 700mA - critical for thermally constrained QFN packages.

What is the minimum sense resistor value for accurate 700mA current limiting?

Using the typical V_TRIP of 185mV and target I_LIMIT = 700mA, R_SENSE = V_TRIP/I_LIMIT = 0.264Ω. A standard 0.27Ω, 1% tolerance, 0.5W metal-film resistor meets accuracy and power requirements while staying within 2.7µs blanking window constraints.