Monolithic Power Systems Inc. MP6605CGR-Z

Overview

MP6605CGR-Z from Monolithic Power Systems is a 4-channel low-side driver IC with I²C interface, designed to control inductive loads such as unipolar stepper motors and solenoids. It integrates four N-channel MOSFETs (R_DS(ON) = 350 mΩ typ), supports 4.5V–60V input voltage, delivers up to 1.5A per channel (single-channel on), and includes over-current, under-voltage lockout, and over-temperature protection.

For engineers reviewing the MP6605CGR-Z datasheet, MP6605CGR-Z pinout, MP6605CGR-Z application, or MP6605CGR-Z equivalent, this device is selected for precision current-controlled actuation in motion control systems where compact size, thermal robustness, and digital configurability via I²C are required.

Technical Context

The MP6605CGR-Z implements a digitally addressable low-side switching architecture with integrated clamp diodes and VCLAMP pin for leakage inductance energy dissipation. Its I²C slave interface supports up to 400 kHz clock frequency and uses A0–A3 pins to configure one of 16 possible 7-bit addresses.

Each output channel features independent OCP with 3.5 µs deglitch time and automatic retry after 2.5 ms, while fault status is reported via open-drain nFAULT. The device operates without a separate logic supply-its 3.3V/5V-compatible inputs draw <5 µA and tolerate VIH ≥2.3 V and VIL ≤0.7 V.

Key Specifications

Pinout & Package

MP6605CGR-Z is housed in a thermally enhanced QFN-24 (4mm × 4mm) package with exposed thermal pad (Pin 7). The package supports high-power density operation and requires PCB thermal vias under the pad for reliable 1.5A continuous operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-side I²C motor driver applications.

Compared with TB9051FTG and DRV8803, MP6605CGR-Z uniquely combines quad-channel integration, I²C configurability, autonomous OCP/OTP/VCLAMP management, and fault reporting in a single QFN-24 package - making it optimal for space-constrained, networked motion subsystems requiring minimal MCU overhead.

Availability

MP6605CGR-Z is available at Aetrix Electronics and suitable for unipolar stepper motor control, solenoid actuation, multi-axis motion controllers, and smart HVAC damper modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MP6605CGR-Z 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, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP6605C belongs to MPS's industrial-grade motor driver product line, engineered specifically for digitally controlled inductive load switching in harsh environments - emphasizing thermal resilience, fault autonomy, and interface simplicity.

FAQ

What is the maximum continuous output current per channel under typical PCB conditions?

The MP6605CGR-Z supports 1.5A continuous per channel when only one output is active and thermal vias are implemented under the exposed pad on a 4-layer PCB. With all four channels active simultaneously, derating to 700mA per channel is required to maintain junction temperature ≤125°C at TA = 85°C.

How is the I²C address configured, and what is the default setting?

The I²C 7-bit address is set by A0–A3 pins: each pin grounded = '0', floating = '1'. With all four pins floating, the default address is 0x4E (binary 1001110). The address byte includes WR bit (0 for write), so full write address is 0x9C. No external pull-ups are needed on A0–A3 due to internal ~6V pull-ups.

Can the VCLAMP pin be connected directly to VIN without a TVS diode?

Yes - connecting VCLAMP directly to VIN configures internal clamp diodes as freewheeling paths, limiting output voltage to VIN + ~1.1V. This is acceptable for low-speed solenoid applications but insufficient for high-speed unipolar stepper decay requirements, where a 24V TVS (e.g., SMAJ24A) is recommended to allow faster current decay and higher effective voltage headroom.

Does nENBL disable the I²C interface?

No - asserting nENBL high disables only the output MOSFETs (OUT1–OUT4); the I²C interface remains fully operational. This allows register reads (e.g., fault status, SIN inputs) and configuration writes while outputs are safely disabled, supporting safe diagnostic modes during system initialization or error recovery.

What is the purpose of the SIN0–SIN2 pins, and how are they used in practice?

SIN0–SIN2 are Schmitt-triggered, internally pulled-down logic inputs for external feedback signals - commonly used for end-stop detection, homing switches, or position encoder synchronization. Their states are readable via I²C register (S0–S2 bits), enabling coordinated motion control without consuming MCU GPIOs or requiring additional level-shifting circuitry.

Is the MP6605CGR-Z RoHS-compliant and lead-free?

Yes - MP6605CGR-Z is fully RoHS-compliant, lead-free, and halogen-free, meeting EU Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) for unlimited floor life at ≤30°C/60% RH. Full compliance documentation is available on the MPS Quality Assurance portal.