Monolithic Power Systems Inc. MP6600LGR-P

Overview

MP6600LGR-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 microstepping up to 1/8-step. It operates from 4.5V to 35V input, delivers up to 1.5A per phase under thermal design constraints, and integrates OCP, OVP, UVLO, and thermal shutdown. It is used in precision motion control systems such as industrial printers and automated lab equipment.

For engineers reviewing the MP6600LGR-P datasheet, MP6600LGR-P pinout, MP6600LGR-P application, or MP6600LGR-P equivalent, this page provides verified technical context, QFN-24 package layout, step-mode configuration logic, fault reporting behavior, and real-world microstepping current profiles - all critical for motor driver selection, PCB layout, and thermal validation.

Technical Context

The MP6600LGR-P implements a constant-off-time (COT) PWM current regulation architecture with internal current sensing, eliminating external sense resistors. Its dual N-channel H-bridges support bidirectional current control per winding, with automatic decay mode switching between slow and fast decay based on real-time current error detection at the end of each fixed t_OFF interval.

Step resolution is set via MS1/MS2 logic inputs (full/half/quarter/eighth-step), while DIR controls rotation direction and STEP triggers translator advancement on rising edges. The device uses an internal charge pump (VCP/CP1/CP2/VG) to drive high-side MOSFETs, with 195mΩ HS-FET and 170mΩ LS-FET on-resistance at 25°C - enabling efficient operation at up to 35V supply.

Key Specifications

Pinout & Package

MP6600LGR-P is housed in a thermally enhanced QFN-24 (4mm × 4mm) package with exposed pad (EP) for PCB thermal dissipation. Pin numbering follows standard top-view orientation with pin 1 marked by dot or chamfered corner.

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, MP6600LGR-P offers superior integration (no sense resistors, internal charge pump), tighter current regulation accuracy (±5% vs ±10%), and native 35V operation with comprehensive protection - making it optimal for compact, high-reliability industrial motion systems.

Availability

MP6600LGR-P is available at Aetrix Electronics and suitable for industrial printers, lab automation platforms, 3D printer motion control, and CNC engraving modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP6600LGR-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 power management ICs, including DC/DC converters, LED drivers, motor drivers, and battery management solutions.

The MP6600L product line is designed for compact, cost-sensitive bipolar stepper motor applications requiring high integration, internal current sensing, and robust protection - targeting industrial automation, medical devices, and precision instrumentation.

FAQ

What is the maximum continuous output current per phase for MP6600LGR-P?

The MP6600LGR-P supports up to ±1.5A per phase continuously, contingent on PCB thermal design meeting θ_JA ≤ 42°C/W and ambient temperature ≤ 85°C. At 25°C ambient with 2-layer board, derating begins above 1.2A; full 1.5A requires 4-layer board with thermal vias to EP ground plane.

Does MP6600LGR-P require external current sense resistors?

No. MP6600LGR-P uses fully integrated current sensing with ±5% accuracy across 34–100% of full-scale current. The ISET pin connects only to a single resistor to ground - eliminating external sense resistors, their PCB layout sensitivity, and associated power loss.

How does the automatic decay mode function in MP6600LGR-P?

The device starts each PWM off-time in slow decay. If current remains above the I_TRIP threshold at the end of t_OFF, it switches to fast decay for one cycle. Once current drops below I_TRIP, it reverts to slow decay - dynamically optimizing torque and reducing heating without user configuration.

What is the minimum STEP pulse width and timing requirement relative to MS1/MS2 and DIR?

The minimum STEP high/low time is 1µs each. MS1, MS2, and DIR must be stable for ≥200ns before and after the STEP rising edge - verified in Figure 3 of the datasheet. Violating setup/hold times may cause missed steps or erratic microstep sequencing.

Can MP6600LGR-P operate from a 5V supply?

Yes - its 4.5V to 35V input range includes 5V operation. However, output current capability scales with supply voltage and thermal headroom; at 5V, peak current is limited by MOSFET conduction loss and junction temperature, typically ≤0.8A continuous without aggressive cooling.

What package variant does MP6600LGR-P correspond to?

MP6600LGR-P is the QFN-24 (4mm × 4mm) package with wettable flanks and exposed thermal pad (EP), rated MSL-1, and marked "M6600L" with year/week code. The "-P" suffix denotes tape-and-reel packaging (5000 units/reel), per carrier information on page 21.

How is over-current protection triggered and cleared?

OCP activates if sensed current exceeds 6A for >1µs (deglitch time), disabling all MOSFETs and pulling nFAULT low. Recovery requires cycling VIN power or toggling nSLEEP - ENBL or STEP changes alone will not reset the latched fault condition.