Monolithic Power Systems Inc. MP6601GF

Overview

MP6601GF from Monolithic Power Systems is a 35V, 2.5A bipolar stepper motor driver with integrated dual full-bridge MOSFETs, internal current sensing (no external sense resistors), and programmable constant-off-time PWM control. It supports full-, half-, and quarter-step modes via PHASE/I0/I1 logic interface and delivers up to 2.5A per phase under thermal limits in TSSOP-28 EP package. Used in precision motion control for printers and industrial automation.

For engineers reviewing the MP6601GF datasheet, MP6601GF pinout, MP6601GF application, or MP6601GF equivalent, key selection considerations include its 4.5–35V input range, internal 170mΩ/150mΩ HS/LS R_DS(on), open-drain nFAULT reporting, automatic decay mode, and compatibility with 3.3V/5V logic levels.

Technical Context

The MP6601GF integrates two independent N-channel H-bridges with internal current regulation using a 2-bit DAC-based scaling (via AI0/AI1 and BI0/BI1) and constant-off-time PWM controlled by ROSC resistor. Current trip level is set by ISET resistor (e.g., 71kΩ → 1.0A full-scale), with blanking time fixed at 2µs to suppress switching spikes.

It implements automatic decay mode-starting in slow decay and switching to fast decay only if current remains above ITRIP at end of t_OFF. Protection includes OCP (6A trip, 1µs deglitch), OVP (37.5V threshold), UVLO (4.5V rising), and thermal shutdown (165°C), all signaled via open-drain nFAULT.

Key Specifications

Pinout & Package

MP6601GF uses thermally enhanced TSSOP-28 EP package (9.7mm × 4.4mm × 1.05mm) with exposed pad for PCB heat sinking. Pin count: 28 leads + EP pad. Compatible with standard reflow profiles and RoHS-compliant assembly.

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 offers optimal integration for space-constrained industrial motion systems-combining internal current sensing, comprehensive protection, and 3.3V/5V logic compatibility in a single TSSOP-28 EP package without auxiliary supplies.

Availability

MP6601GF is available at Aetrix Electronics and suitable for printer mechanisms, CNC axis control, medical lab automation stages, and ATM cash dispensers requiring stable component supply across production lifecycles.

Supply support for MP6601GF 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, headquartered in Kirkland, WA, with global design and support operations.

The MP6601 series targets cost-sensitive, space-constrained motion control applications-designed to replace discrete H-bridge solutions with integrated protection, current regulation, and thermal robustness in industrial and office equipment.

FAQ

What is the maximum continuous output current for MP6601GF at 85°C ambient?

The MP6601GF delivers up to 2.5A per phase under thermal design constraints. At 85°C ambient with proper PCB copper area and ≥6 thermal vias to inner ground planes, sustained 2.5A operation is achievable due to the TSSOP-28 EP's 32°C/W θ_JA and 6°C/W θ_JC. Derating is required above 100°C junction temperature.

Does MP6601GF require external current-sense resistors?

No. MP6601GF uses internal current sensing circuitry-eliminating external sense resistors entirely. Current regulation is set via the ISET pin resistor (e.g., 71kΩ for 1.0A full-scale), and PWM duty cycle adjusts dynamically to maintain target current without shunt losses or layout sensitivity.

How does the automatic decay mode function in MP6601GF?

MP6601GF begins each off-time in slow decay. If current remains above the ITRIP threshold at the end of t_OFF, it switches to fast decay for remainder of the cycle. Once current drops below ITRIP, it reverts to slow decay. This hybrid approach minimizes audible noise and torque ripple while maintaining precise current regulation.

Can MP6601GF drive DC brush motors?

Yes. Its dual independent H-bridges can drive two DC brush motors simultaneously. Both bridges share the same ISET-defined current limit, so stall current is identical for both motors. For speed/direction control, apply PWM to PHASE inputs or use external enable logic-though short-brake functionality is not supported.

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

ROSC sets the constant off-time (t_OFF) of the PWM current regulator. Connect a resistor from ROSC to GND: t_OFF ≈ 190 × R_t (ns), where R_t is in kΩ. A 200kΩ resistor yields ~23µs t_OFF, balancing current ripple, efficiency, and thermal performance for typical 24V, 2.5A stepper loads.

Is MP6601GF RoHS-compliant and halogen-free?

Yes. MP6601GF is lead-free, halogen-free, and fully compliant with the EU RoHS directive. MPS confirms green status on its official Quality Assurance page, and the device meets JEDEC MSL-3 moisture sensitivity requirements for standard surface-mount assembly.