Monolithic Power Systems Inc. MP6605CGR-P

Overview

MP6605CGR-P 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 active), and includes over-current, under-voltage lockout, and over-temperature protection.

For engineers reviewing the MP6605CGR-P datasheet, MP6605CGR-P pinout, MP6605CGR-P application, or MP6605CGR-P equivalent, key selection considerations include its QFN-24 package thermal performance, I²C address configurability via A0–A3 pins, fault reporting via open-drain nFAULT, and VCLAMP pin compatibility with TVS clamping for inductive kickback suppression.

Technical Context

The MP6605CGR-P implements four independent low-side switching channels with integrated clamp diodes and a shared VCLAMP node for energy recirculation during inductive turn-off. Its I²C slave interface operates up to 400 kHz, supports 7-bit addressing with 16 configurable device addresses via A0–A3, and uses Schmitt-trigger logic inputs compatible with both 3.3V and 5V microcontrollers.

Internal protection circuitry includes cycle-by-cycle over-current detection (IOCP = 1.5A typ, deglitch time = 3.5 µs), UVLO with 4.5V rising threshold, and thermal shutdown at 165°C with 25°C hysteresis. The device requires no separate logic supply - all digital I/O is powered from VIN via internal regulation.

Key Specifications

Pinout & Package

MP6605CGR-P is housed in a thermally enhanced QFN-24 (4mm × 4mm) package with an exposed thermal pad (Pin 7) for PCB heat sinking. The package supports reflow soldering per JEDEC J-STD-020 and has MSL Level 1 rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TB9051FTG and DRV8803, MP6605CGR-P uniquely combines I²C configurability, self-powered logic, integrated clamp architecture, and real-time fault signaling - making it optimal for space-constrained, multi-channel, and remotely monitored industrial motion systems.

Availability

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

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

The MP6605CGR-P belongs to MPS's industrial-grade motor driver product line, engineered specifically for robust, digitally controllable low-side switching in harsh electromagnetic environments - targeting factory automation, precision instrumentation, and building control systems.

FAQ

What is the maximum safe operating voltage on the OUTx pins?

The absolute maximum voltage on any OUTx pin is +65V, but the functional clamp voltage is limited to 60V by the VCLAMP pin rating. To ensure reliability, the external TVS diode on VCLAMP must be selected so that its breakdown voltage keeps VCLAMP ≤60V under worst-case inductive flyback conditions - e.g., a 24V TVS for 24V VIN systems.

Can MP6605CGR-P drive bipolar stepper motors?

No - MP6605CGR-P is a low-side-only driver with no high-side switching capability or H-bridge topology. It is expressly designed for unipolar stepper motors (with center-tapped windings) and solenoids. Driving bipolar steppers would require complementary high-side drivers or full H-bridge ICs like the MP6550.

How does the over-current protection (OCP) behave during sustained overload?

OCP triggers when channel current exceeds 1.5A (typ) for longer than 3.5 µs. Upon trip, all outputs disable immediately, nFAULT pulls low, and the device automatically retries after 2.5 ms. This hiccup-mode behavior prevents thermal runaway while allowing recovery if the overload is transient - no manual reset is needed unless UVLO or OTP also activates.

Is the A0–A3 address configuration latched at power-up or dynamic?

A0–A3 states are sampled only at power-on reset (POR) or after a high-to-low transition on the RESET pin. Once initialized, the I²C address remains static until the next POR or RESET event - it cannot be changed dynamically during normal I²C operation.

What is the minimum recommended PCB copper area for thermal management?

MPS recommends at least 100 mm² of 2-oz copper connected to the exposed thermal pad (Pin 7) with ≥4 thermal vias (0.3mm diameter, filled or capped). With this layout, the device sustains 1.5A per channel at TA = 85°C; reducing copper area requires derating per the thermal resistance curve in the datasheet.

Does the nFAULT pin indicate which channel caused the fault?

No - nFAULT is a global open-drain output that asserts for any fault condition (OCP on any channel, UVLO, or OTP), but does not encode channel-specific information. To identify the failing channel, the host MCU must read the I²C status register (if implemented in firmware) or monitor individual OUTx currents externally.

Can SIN0–SIN2 be used as general-purpose digital inputs?

Yes - SIN0–SIN2 are CMOS inputs with internal 100kΩ pull-down resistors and Schmitt-trigger thresholds (VIH = 2.3V, VIL = 0.7V). They tolerate 0–6.5V and can interface directly with dry-contact switches, optocoupler outputs, or logic-level signals without external biasing.