Monolithic Power Systems Inc. MP6507GR-P

Overview

MP6507GR-P 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 - used in POS printers, security cameras, and battery-powered camera modules.

For engineers reviewing the MP6507GR-P datasheet, MP6507GR-P pinout, MP6507GR-P application, or MP6507GR-P equivalent, key selection criteria include its 4×4mm QFN package with exposed thermal pad, dual full-bridge gate logic (AIN1/AIN2/BIN1/BIN2), current-sense interface (SENA/SENB), and fault reporting via open-drain FAULT pin.

Technical Context

The MP6507GR-P implements two independent full-bridge drivers with integrated 500mΩ high-side and low-side N-MOSFETs per channel, enabling bidirectional current control for stepper motor phase windings. Its internal charge pump sustains high-side gate drive across the full 2.7V–15V input range without external bootstrap components.

Current regulation operates in either external PWM mode (via AIN1/AIN2/BIN1/BIN2 logic inputs) or internal constant-off-time mode (27µs TOFF, 185mV VTRIP, 2.7µs TBLANK), with synchronous rectification during slow-decay freewheeling to reduce conduction loss. Fault protection includes UVLO (2.5V rising threshold), thermal shutdown at 165°C, and over-temperature flag assertion.

Key Specifications

Pinout & Package

The MP6507GR-P is housed in a 4mm × 4mm, 16-pin QFN package with an exposed thermal pad on the underside, soldered directly to PCB ground plane for optimal thermal dissipation (θJA = 46°C/W, θJC = 10°C/W).

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, MP6507GR-P uniquely balances 2.7V–15V operation, integrated MOSFETs, thermal flag, and 4×4mm footprint - making it optimal for mid-power portable motion control where voltage flexibility and diagnostic visibility are essential.

Availability

MP6507GR-P is available at Aetrix Electronics and suitable for POS printers, video security cameras, digital still cameras, and battery-powered toys requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP6507GR-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP6507 product line targets compact, battery-sensitive motion control applications - delivering integrated stepper drivers with minimal external components, robust thermal management, and precise current regulation for consumer and industrial edge devices.

FAQ

What is the maximum motor supply voltage supported by MP6507GR-P?

The MP6507GR-P supports a continuous input voltage range of 2.7V to 15V on the VIN pin, with absolute maximum rating of 18V. Operation above 15V risks exceeding safe operating area limits and triggering UVLO or thermal shutdown.

How does the internal current limit work, and what external components are required?

The internal current limit uses a 145–225mV trip threshold (VTRIP) applied across external sense resistors (RSENA/RSENB). For 700mA full-scale, a 0.25Ω resistor yields 175mV at trip - placed low-side between SENA/SENB and GND. No op-amps or external comparators are needed.

Can MP6507GR-P drive unipolar stepper motors?

No - MP6507GR-P is designed exclusively for bipolar stepper motors with center-tapped or dual-winding configurations. Its dual full-bridge topology requires four-terminal connection (AOUT1/AOUT2/BOUT1/BOUT2) and cannot interface with unipolar 5- or 6-wire motor wiring.

What is the purpose of the BST pin, and what capacitor value is recommended?

The BST pin is the charge pump output that supplies gate drive voltage for the high-side N-MOSFETs. A 10nF to 100nF ceramic capacitor must be placed between BST and VIN; 47nF X7R is recommended for stability across temperature and voltage.

Does MP6507GR-P support microstepping?

MP6507GR-P natively supports full-step and half-step excitation via external logic sequencing of AIN1/AIN2/BIN1/BIN2. Microstepping requires external current DAC or PWM modulation - the IC's internal current controller does not generate fractional steps autonomously.

How is thermal performance affected by the exposed pad connection?

The exposed thermal pad must be soldered to a solid GND copper pour with ≥4 thermal vias (0.3mm diameter) to inner/ground layers. Without this, θJA degrades from 46°C/W to >70°C/W, risking thermal shutdown at <400mA load in still air.

Is the FAULT pin actively driven or open-drain?

The FAULT pin is open-drain and requires an external pull-up resistor (typically 10kΩ to VDD or system IO rail). It asserts low during over-temperature shutdown and remains low until junction temperature drops below 150°C (15°C hysteresis).