Monolithic Power Systems Inc. MP6605DGR-Z

Overview

MP6605DGR-Z from Monolithic Power Systems is a 4-channel parallel-interface low-side MOSFET driver IC integrating four N-channel power MOSFETs (R_DS(ON) = 350 mΩ), four high-side clamp diodes, and full protection circuitry. It delivers up to 1.5A per channel at 4.5V–60V input, supports unipolar stepper motor winding control, and features open-drain fault reporting via nFAULT. Designed for industrial motion control with inductive load switching.

For engineers reviewing the MP6605DGR-Z datasheet, MP6605DGR-Z pinout, MP6605DGR-Z application, or MP6605DGR-Z equivalent, this page provides verified electrical parameters, validated QFN-24 pin mapping, confirmed thermal shutdown behavior (T_SD = 155°C), real-world solenoid drive timing constraints, and direct alternative part comparisons based on functional equivalence in parallel-controlled inductive load systems.

Technical Context

The MP6605DGR-Z implements independent parallel logic control of four low-side switches with internal gate drivers, enabling simultaneous or staggered activation of inductive loads. Each channel includes integrated body diode conduction path and shares a common VCLAMP node for transient energy clamping during turn-off.

Its protection architecture combines cycle-by-cycle over-current detection (IOCP = 1.5A typ., deglitch t_OCP = 3.5 µs), under-voltage lockout (VIN_UVLO_RISING = 4.5V), and thermal shutdown (hysteresis = 25°C), all feeding into a single open-drain nFAULT output. Sleep mode reduces quiescent current to 2 µA while disabling all outputs and internal charge pumps.

Key Specifications

Pinout & Package

MP6605DGR-Z is housed in a thermally enhanced QFN-24 (4mm × 4mm) package with exposed thermal pad (EP) connected to GND. The package supports ≥2.9W continuous power dissipation at TA = 25°C (θ_JA = 42°C/W) when mounted with ≥6 thermal vias to inner ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TB6603FG and ULN2003A, MP6605DGR-Z offers superior integration (VCLAMP, OCP, nFAULT), lower conduction loss (350 mΩ vs. Darlington saturation), and native 60V operation-making it optimal for compact, protected, high-voltage stepper/solenoid control where board space and reliability are critical.

Availability

MP6605DGR-Z is available at Aetrix Electronics and suitable for unipolar stepper motor control, solenoid actuation, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP6605DGR-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, including DC/DC converters, LED drivers, motor drivers, and battery management solutions.

The MP6605D product line targets industrial motion control applications, delivering integrated low-side drivers with built-in protection and clamp functionality to simplify design of reliable, compact inductive load interfaces.

FAQ

What is the maximum allowable voltage on the OUTx pins?

The absolute maximum voltage on OUT1–OUT4 is +65V, but the recommended operating maximum is 60V per the VCLAMP clamp specification. Exceeding 60V risks triggering overvoltage protection or damaging internal clamp diodes unless VCLAMP is properly configured with an external TVS diode rated for the expected spike amplitude.

Can MP6605DGR-Z drive bipolar stepper motors?

No-MP6605DGR-Z is designed exclusively for unipolar stepper motors with center-tapped windings. It lacks high-side drive capability and complementary output pairs required for H-bridge bipolar control. Bipolar steppers require dual half-bridge or full-H-bridge drivers such as MP6550 or TB6600.

How does the VCLAMP pin function during normal operation?

VCLAMP serves as the common anode node for all four internal high-side clamp diodes. During MOSFET turn-off, inductive flyback current flows from OUTx through the internal diode into VCLAMP, then to VIN (via external TVS or direct connection). This clamps the OUTx voltage to VCLAMP + V_FWD, preventing destructive voltage spikes.

Is an external pull-up resistor required for nFAULT?

Yes-an external pull-up resistor (typically 4.7kΩ to 3.3V or 10kΩ to 5V) is mandatory because nFAULT is an open-drain output. Without it, the pin remains floating during fault-free operation and cannot signal "no fault" (high state) to the host MCU or monitoring circuit.

What thermal vias are recommended for the QFN-24 exposed pad?

MPS recommends ≥6 thermal vias (0.3mm diameter, 0.5mm pitch) connecting the exposed pad (Pin 7/EP) directly to an internal or bottom-layer solid ground plane. This achieves θ_JA ≈ 42°C/W and maintains junction temperature ≤125°C at 1.5A per channel with 25°C ambient.

Does SLEEP mode affect nFAULT reporting?

No-nFAULT remains fully functional in SLEEP mode. If a fault (OCP, UVLO, thermal) occurs while SLEEP = high, nFAULT will still be pulled low. However, all outputs and internal gate drivers are disabled, so no new faults can originate from switching activity during sleep.

What is the minimum pulse width for INx signals to ensure reliable switching?

The datasheet specifies no minimum pulse width, but practical operation requires ≥100ns high-time to guarantee proper latch and gate drive activation. For PWM applications above 20kHz, ensure rise/fall times <50ns and avoid undershoot below 0.7V to prevent metastability in the input comparator stage.