Monolithic Power Systems Inc. MP6507GF

Overview

MP6507GF from Monolithic Power Systems is a bipolar stepper-motor driver IC with dual integrated N-channel full-bridge MOSFETs, operating from 2.7V to 15V and delivering up to 700mA per channel. It features internal charge pump, 1.1mA quiescent current, thermal shutdown with fault flag output, and supports both external PWM and internal constant-off-time current control for precise winding current regulation in compact POS printers and battery-powered cameras.

For engineers reviewing the MP6507GF datasheet, MP6507GF pinout, MP6507GF application, or MP6507GF equivalent, key selection considerations include its TSSOP16-EP (5.0×6.4mm) thermally enhanced package, dual full-bridge gate logic mapping, 185mV current-sense threshold, 27µs constant off-time, and sleep-mode wake-up time of 1.5ms - all critical for low-power, high-reliability motion control designs.

Technical Context

The MP6507GF implements two independent full-bridge drivers with integrated 460mΩ/395mΩ (HS/LS, typ.) N-MOSFETs per channel and an internal charge pump enabling high-side drive without external bootstrap components. Its current regulation supports both external PWM input (via AIN1/AIN2/BIN1/BIN2) and internal constant-off-time control using external sense resistors (SENA/SENB) and a 185mV trip threshold.

Protection architecture includes under-voltage lockout (2.5V rising threshold), thermal shutdown at 165°C with 15°C hysteresis, and blanking time (2.7µs typ.) to suppress switching-current spikes. The nSLEEP pin enables 1µA sleep mode, and FAULT pin asserts low during over-temperature events.

Key Specifications

Pinout & Package

TSSOP16-EP (5.0mm × 6.4mm) with exposed thermal pad soldered to PCB ground plane for 45°C/W junction-to-ambient thermal resistance - optimized for sustained 700mA operation in space-constrained applications.

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, MP6507GF delivers optimal balance of integration (charge pump, fault flag), thermal robustness (165°C shutdown + FAULT pin), and low-power operation (1µA sleep) for mid-current portable motion systems - making it uniquely suited for battery-powered imaging and compact automation where board area and thermal management are critical.

Availability

MP6507GF is available at Aetrix Electronics and suitable for POS printers, video security cameras, digital still cameras, and battery-powered toys requiring stable component supply, consistent thermal performance, and long-term production continuity.

Supply support for MP6507GF 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, thermal resilience, and low-quiescent-power operation for battery-sensitive applications.

FAQ

What is the recommended external sense resistor value for 500mA per phase?

Using the typical current-sense threshold of 185mV, a 0.37Ω resistor yields 500mA (I = V_TRIP/R = 0.185V / 0.37Ω). Standard 0.39Ω ±1% 0805 resistors are commonly used, resulting in 474mA limit - verified in MPS evaluation schematics and compatible with 1% tolerance drift over temperature.

Does MP6507GF support microstepping?

No - MP6507GF supports only full-step and half-step excitation modes via discrete INx pin logic sequencing. It lacks internal indexer or DAC-based current profiling required for true microstepping; external MCU must generate precise timing and current-ramp waveforms for sub-step resolution.

How is thermal performance affected if the exposed pad is not soldered to PCB ground?

Without soldered thermal pad connection, θ_JA degrades from 45°C/W to >90°C/W, reducing maximum continuous output current by ~40% at ambient 60°C. The device may enter thermal shutdown prematurely during sustained 700mA operation - MPS strongly mandates full-pad soldering with ≥4 thermal vias to inner ground planes.

Can MP6507GF drive two independent DC motors instead of a stepper?

Yes - each full-bridge operates independently: AOUT1/AOUT2 controls one DC motor, BOUT1/BOUT2 controls another. Input logic follows standard H-bridge truth table (Table 1), supporting forward/reverse/brake/coast functions. No firmware modification is needed beyond pin assignment.

What is the minimum BST capacitor value and dielectric type recommended?

MPS specifies 10nF to 100nF ceramic (X7R or C0G) between BST and VIN. A 47nF X7R 0603 capacitor is validated in the reference design (Figure 9); smaller values risk insufficient gate drive voltage under high-frequency switching, causing increased R_DS(on) and thermal stress on high-side MOSFETs.

Is the FAULT pin actively driven or open-drain?

The FAULT pin is open-drain with internal pull-down - it asserts low during thermal shutdown or UVLO fault conditions and floats high otherwise. An external 10kΩ pull-up to VDD or VIN is required for proper logic-level signaling to host MCU interrupt inputs.

What happens to motor windings during nSLEEP assertion?

Upon nSLEEP low, both full-bridges disable immediately, placing all four outputs (AOUT1/AOUT2/BOUT1/BOUT2) in high-impedance state. Motor current decays through external flyback paths or internal body diodes; no active braking or holding torque is maintained - mechanical detent or external hold circuits are required for position retention.