Monolithic Power Systems Inc. MP6600GR-P

Overview

MP6600GR-P from Monolithic Power Systems is a bipolar stepper motor driver IC with integrated translator, internal current sensing, and dual full-bridge MOSFETs. It operates from 4.5V to 35V, delivers up to 1.5A per phase, supports full/half/quarter/eighth-step modes, and features OCP/OVP/UVLO/thermal shutdown - used in precision motion control for compact printers and automated lab equipment.

For engineers reviewing the MP6600GR-P datasheet, MP6600GR-P pinout, MP6600GR-P application, or MP6600GR-P equivalent, key selection criteria include its QFN-24 package, internal current regulation (no external sense resistors), programmable constant off-time PWM, automatic decay mode, and fault reporting via open-drain nFAULT.

Technical Context

The MP6600GR-P integrates two independent N-channel H-bridges with HS on-resistance of 195mΩ and LS on-resistance of 170mΩ at 25°C, enabling bidirectional current control for bipolar stepper windings. Its translator logic interprets STEP/DIR/MS1/MS2 inputs to sequence phase currents without external microcontroller timing.

Current regulation uses internal sensing and programmable constant off-time PWM, where ROSC sets t_OFF (20–26µs typical) and ISET resistor sets peak current (e.g., 1.0A ±5% with 71kΩ). Blanking time (2µs) prevents false OCP triggering during switching transients.

Key Specifications

Pinout & Package

MP6600GR-P is housed in a thermally enhanced QFN-24 (4mm × 4mm) package with an exposed thermal pad (EP) connected to GND. The package supports reflow soldering per JEDEC J-STD-020 and requires controlled PCB land pattern per MPS specification.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TB6600HG and DRV8825, MP6600GR-P offers optimal balance of integration (no sense resistors), protection (OVP/UVLO), and compactness (QFN-24), making it ideal for space-constrained industrial and medical motion systems requiring robust, self-contained drive capability.

Availability

MP6600GR-P is available at Aetrix Electronics and suitable for 3D printer motion control, lab automation stage drivers, and industrial CNC panel mount applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP6600GR-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 global manufacturing and quality certifications including ISO 9001 and AEC-Q200 for select products.

The MP6600 product line targets compact, intelligent stepper motor drive solutions for industrial automation and precision instrumentation - emphasizing integration, thermal efficiency, and autonomous protection.

FAQ

What is the maximum motor supply voltage supported by MP6600GR-P?

The MP6600GR-P supports a continuous input voltage range of 4.5V to 35V, with absolute maximum rating of 40V. Input over-voltage protection triggers at 37.5V (typical), disabling outputs and asserting nFAULT to prevent damage during transient surges or supply misconfiguration.

Does MP6600GR-P require external current sense resistors?

No. MP6600GR-P uses fully integrated current sensing with no external sense resistors required. Current regulation is achieved via internal MOSFET R_DS(on) sensing and programmable constant off-time PWM, reducing BOM count, PCB area, and power loss associated with shunt resistors.

How does the automatic decay mode function in MP6600GR-P?

The MP6600GR-P monitors winding current during each PWM off-time. If current remains above the trip threshold at the end of the fixed off-time, it switches to fast decay (reversing bridge polarity); otherwise, it continues slow decay (freewheeling through low-side FETs). This adapts dynamically to load and speed without configuration.

What is the purpose of the ROSC pin and how is it configured?

ROSC sets the constant off-time duration (t_OFF) of the PWM current regulator using an external resistor to AGND. With a 200kΩ resistor, t_OFF is 20–26µs (typical). This directly affects current ripple magnitude and regulation stability - lower values increase switching frequency and reduce ripple but raise switching losses.

Can MP6600GR-P operate with a 3.3V logic supply?

Yes. MP6600GR-P logic inputs (STEP, DIR, MS1, MS2, nENBL, nSLEEP) are compatible with both 3.3V and 5V CMOS logic levels. Input high threshold is 2.1V min, and internal pull-down resistors (500kΩ) ensure defined states when left un-driven - no level-shifting required for modern microcontrollers.

What thermal considerations apply to MP6600GR-P in continuous 1.5A operation?

At 1.5A per phase and 24V input, MP6600GR-P dissipates ~0.5W per bridge (based on R_DS(on)). With θ_JA = 42°C/W and 25°C ambient, junction temperature rises ~21°C - well below the 125°C max operating limit. Use of the exposed pad with ≥4 thermal vias to inner ground planes is mandatory for sustained 1.5A performance.

How does the nFAULT pin behave during over-current events?

During over-current (OCP), nFAULT is driven low within 1µs and remains low for 2.4ms (typical) while the H-bridges are disabled. After this deglitch period, the device automatically resumes operation if the fault condition is cleared. An external pull-up resistor (e.g., 10kΩ to 3.3V) is required to detect the high-impedance state.