Monolithic Power Systems Inc. MP6601GF-P

Overview

MP6601GF-P from Monolithic Power Systems is a bipolar stepper motor driver IC with integrated dual full-bridge MOSFETs, internal current sensing (no external sense resistors), and programmable constant-off-time PWM control. It operates from 4.5V–35V input, delivers up to 2.5A per phase, supports full/half/quarter-step modes via PHASE/I0/I1 logic, and includes OCP, OVP, UVLO, thermal shutdown, and open-drain fault reporting - used in compact motion control systems such as industrial printers and automated lab equipment.

For engineers reviewing the MP6601GF-P datasheet, MP6601GF-P pinout, MP6601GF-P application, or MP6601GF-P equivalent, key selection criteria include its TSSOP-28 EP thermally enhanced package, 170mΩ HS / 150mΩ LS on-resistance, 2.5A continuous output capability under thermal management, and compatibility with 3.3V/5V logic interfaces for direct microcontroller integration.

Technical Context

The MP6601GF-P integrates two independent N-channel H-bridges with internal current regulation using a programmable constant-off-time PWM scheme controlled by ROSC resistor and ISET resistor. Current scaling is set via 2-bit digital inputs (AI0/AI1, BI0/BI1) selecting 0%, 38%, 71%, or 100% of full-scale peak current.

It implements automatic decay mode switching between slow and fast decay based on real-time winding current detection at the end of each off-time period. Fault handling includes latched OCP with 5ms auto-recovery, input OVP at 37.5V ±1.5V, UVLO at 4.5V rising threshold with 300mV hysteresis, and thermal shutdown at 165°C with 15°C hysteresis.

Key Specifications

Pinout & Package

MP6601GF-P uses the thermally enhanced TSSOP-28 EP package (9.7mm × 4.4mm × 1.2mm), featuring an exposed thermal pad (EP) connected to GND for efficient heat dissipation. The package supports ≥3.9W continuous power dissipation at +25°C ambient when mounted on a 4-layer PCB with thermal vias.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TB6600HG and DRV8825, MP6601GF-P offers superior integration (no sense resistors, single-supply logic), stronger protection (OVP + precise UVLO), and optimized thermal performance in its TSSOP-28 EP package - making it ideal for industrial-grade 24V stepper systems requiring reliability over ultra-fine resolution.

Availability

MP6601GF-P is available at Aetrix Electronics and suitable for industrial printers, lab automation platforms, 3D printer motion subsystems, and CNC engraving modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MP6601GF-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 core expertise in DC-DC conversion, motor control, and LED drivers.

The MP6601 product line targets compact, thermally constrained motion control applications - designed to replace discrete H-bridge solutions with integrated, protected, and easy-to-layout stepper drivers for industrial and medical equipment.

FAQ

What is the maximum motor supply voltage supported by MP6601GF-P?

The absolute maximum VIN rating is 40V, but the recommended operating range is 4.5V to 35V. Operation above 35V risks triggering the input over-voltage protection (OVP) threshold of 37.5V ±1.5V, which disables outputs and asserts nFAULT. Sustained use at 35V requires careful thermal design due to increased conduction loss in the MOSFETs.

Does MP6601GF-P require external current-sense resistors?

No - MP6601GF-P uses fully integrated current sensing with no external sense resistors required. Current regulation is achieved via internal MOSFET R_DS(on) monitoring and a precision reference, reducing BOM count, PCB area, and calibration complexity while maintaining ±5% accuracy across temperature.

How is step resolution configured on MP6601GF-P?

Step resolution (full/half/quarter) is determined by the logic states applied to AI0/AI1 and BI0/BI1 pins. These 2-bit inputs select current amplitude per phase (0%, 38%, 71%, or 100%), and the internal DACs combine with PWM timing to generate the corresponding microstep waveform - no external clock or configuration register is needed.

What thermal design practices are recommended for MP6601GF-P?

Mount the TSSOP-28 EP package on a 4-layer PCB with the exposed pad soldered to a solid GND plane and ≥6 thermal vias (0.3mm diameter) connecting to inner and bottom ground layers. Keep ISET and ROSC resistors within 2mm of their respective pins, and place 100nF VIN bypass capacitors adjacent to Pins 10 and 21 to minimize high-frequency loop inductance.

Can MP6601GF-P drive DC brush motors?

Yes - its dual full-bridge architecture supports two independent DC motors. However, both bridges share the same current regulation threshold, so stall current limiting applies identically to both motors. For DC operation, configure ISET for desired stall current (e.g., 28kΩ for 2.5A) and use PHASE inputs for direction control with PWM on enable signals for speed modulation.

What happens during an over-current fault event?

When OCP triggers (current exceeds IOCP1/IOCP2 threshold for >1µs), all MOSFETs disable, nFAULT pulls low, and the driver remains latched off for ~5ms before auto-recovery. This protects against winding shorts, supply faults, and mechanical stalls without requiring host intervention - but repeated faults indicate persistent overload or incorrect ISET/resistor selection.

Is MP6601GF-P compatible with 3.3V microcontrollers?

Yes - its logic inputs (APHASE, BPHASE, AI0/AI1, BI0/BI1, nSLEEP) accept 3.3V-compatible thresholds: VIH ≥ 2.1V and VIL ≤ 0.8V. No level-shifting is needed when interfacing with standard 3.3V GPIOs, and the internal pull-down on nSLEEP ensures safe default state during MCU reset.