Monolithic Power Systems Inc. MP6507GF-P

Overview

MP6507GF-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, 500mΩ high-side/low-side R_DS(on), thermal shutdown with fault flag output, and supports both external PWM and internal constant-off-time current control for precise winding current regulation in POS printers and security cameras.

For engineers reviewing the MP6507GF-P datasheet, MP6507GF-P pinout, MP6507GF-P application, or MP6507GF-P equivalent, key selection criteria include its 700mA per-channel drive capability, 1μA sleep current, integrated sense-based current limiting (185mV trip), TSSOP-EP thermal package, and dual full-bridge gate logic for full/half-step motor sequencing.

Technical Context

The MP6507GF-P implements two independent full-bridge drivers with synchronous rectification during slow-decay freewheeling, reducing conduction loss versus body-diode decay. Its internal charge pump enables high-side N-MOSFET operation without external bootstrap components, while blanking time (2.7µs) prevents false current-limit triggering during switching transitions.

Control is implemented via four logic inputs (AIN1/AIN2/BIN1/BIN2) supporting phase/magnitude or step/direction modes, with nSLEEP enabling <1μA quiescent state. Fault reporting uses an open-drain FAULT pin asserting low on over-temperature (165°C) or UVLO (2.5V rising threshold).

Key Specifications

Pinout & Package

TSSOP16-EP (5.0mm × 6.4mm) with exposed thermal pad soldered to PCB ground plane for enhanced thermal dissipation (θ_JA = 45°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, MP6507GF-P uniquely balances 700mA drive, 1μA sleep, integrated charge pump, and thermal flag in a thermally enhanced 5×6.4mm TSSOP-EP-making it optimal for cost-sensitive, battery-operated motion systems requiring robust fault reporting.

Availability

MP6507GF-P is available at Aetrix Electronics and suitable for POS printers, video security cameras, and digital still cameras requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant packaging.

Supply support for MP6507GF-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 belongs to MPS's motor driver product line, engineered specifically for compact, thermally constrained stepper applications in consumer and industrial edge devices where integration, efficiency, and fault resilience are critical.

FAQ

What is the maximum allowable motor supply voltage for MP6507GF-P?

The absolute maximum VIN rating is 18V, but the recommended operating range is 2.7V to 15V per the datasheet. Exceeding 15V risks violating the BST-to-VIN voltage limit (VIN + 7V), potentially damaging the internal charge pump circuitry. For 12V nominal systems, 15V represents the safe upper bound during transient conditions.

How does the internal current limit function without external PWM?

In internal PWM mode, the MP6507GF-P uses constant off-time control: the high-side MOSFET turns on until the voltage across R_SENA/R_SENB reaches 185mV (typical), then shuts off for 27µs. During this off-time, current freewheels through both low-side MOSFETs in synchronous rectifier mode, minimizing conduction loss and enabling precise average current regulation without external timing components.

Can MP6507GF-P drive unipolar stepper motors?

No. The MP6507GF-P is designed exclusively for bipolar stepper motors with center-tapped or dual-winding configurations requiring full-bridge drive per phase. Its dual full-bridge architecture cannot replicate the single-ended switching topology needed for unipolar motors, which rely on transistor arrays rather than H-bridges.

What is the purpose of the BST pin and required external component?

The BST pin is the output of the internal charge pump used to generate a gate drive voltage higher than VIN for the high-side N-channel MOSFETs. A 10nF to 100nF ceramic capacitor must be connected between BST and VIN to store and transfer charge; values near 47nF are typical for stability across 2.7–15V input ranges, ensuring reliable high-side turn-on without external bootstrap diodes.

Is the exposed thermal pad on MP6507GF-P electrically connected?

Yes, the exposed pad on the TSSOP16-EP package is internally connected to GND and must be soldered to a PCB copper pour tied to the system ground plane. This connection provides the primary thermal conduction path (θ_JC = 10°C/W) and also reduces EMI by lowering ground impedance. Omitting this connection degrades thermal performance by >50% and risks thermal shutdown under load.

How does the FAULT pin behave during thermal shutdown?

During thermal shutdown, the FAULT pin asserts a logic-low open-drain signal (≤200mV at 1mA sink) and remains low until the junction temperature falls below ~150°C (15°C hysteresis). It does not pulse or toggle-it provides a latched fault indication requiring external system reset or power cycle to clear after cooling, ensuring persistent fault visibility for safety-critical motion control.

What is the minimum external sense resistor value for 700mA current limit?

Using the typical 185mV trip threshold, the minimum R_SENSE is calculated as 185mV ÷ 0.7A = 0.264Ω. Standard 0.25Ω (1% tolerance, 1W) resistors are commonly used. Lower values reduce power loss but require higher precision to maintain accuracy, as the 145–225mV trip range introduces ±22% tolerance in setpoint at fixed R_SENSE.