Monolithic Power Systems Inc. MP6605DGR-P

Overview

MP6605DGR-P 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 typ), four high-side clamp diodes, and full protection circuitry. It delivers up to 1.5A per channel at VIN = 4.5–60V and supports unipolar stepper motor phase winding control with VCLAMP clamping to 60V. Designed for industrial motion control, it drives inductive loads with fault reporting via open-drain nFAULT.

For engineers reviewing the MP6605DGR-P datasheet, MP6605DGR-P pinout, MP6605DGR-P application, or MP6605DGR-P equivalent, key selection criteria include its 4.5–60V wide input range, 1.5A single-channel / 700mA four-channel output current capability, integrated VCLAMP clamp interface, thermal shutdown and OCP response timing (3.5 µs deglitch), and QFN-24 package thermal performance (θ_JA = 42°C/W).

Technical Context

The MP6605DGR-P implements independent parallel logic control of four low-side N-MOSFETs with internal pull-down resistors on all INx and nENBL/SLEEP pins. Each channel features body-diode conduction path and shares a common VCLAMP node for inductive energy recirculation via external TVS or Zener.

Protection architecture includes cycle-by-cycle over-current detection (IOCP = 1.5–4A threshold), under-voltage lockout (VIN_UVLO_RISING = 3.4–4.5V), and thermal shutdown (TSD = 155°C, hysteresis = 25°C), with fault status reported through open-drain nFAULT requiring external pull-up.

Key Specifications

Pinout & Package

MP6605DGR-P is housed in a thermally enhanced QFN-24 (4mm × 4mm) package with exposed thermal pad (EP) connected to GND. The package supports high-power density layout with ≥6 thermal vias recommended under EP for θ_JA = 42°C/W performance on 4-layer PCB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TB6603FG and TPIC2603DWR, MP6605DGR-P delivers integrated power FETs with 1.5A rating, unified VCLAMP clamping, and autonomous fault reporting - reducing total solution size by ≥40% and eliminating 8+ external components in stepper/solenoid applications.

Availability

MP6605DGR-P is available at Aetrix Electronics and suitable for unipolar stepper motor control, solenoid actuation, industrial PLC output modules, and automated test equipment requiring stable component supply across extended temperature ranges (–40°C to +125°C).

Supply support for MP6605DGR-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 MP6605DGR-P belongs to MPS's industrial-grade motor driver product line, engineered specifically for robust, integrated control of inductive loads in harsh environments - emphasizing fault resilience, wide input range, and minimal external component count.

FAQ

What is the maximum allowable voltage on the VCLAMP pin?

The VCLAMP pin has an absolute maximum rating of +65V, but its functional clamp voltage is specified at 60V. To ensure reliable operation, connect VCLAMP to VIN via a TVS diode with breakdown voltage ≤24V for VIN ≤24V systems, or use a Zener diode rated at 60V for higher VIN. Exceeding 60V risks permanent damage to internal clamp diodes.

Can MP6605DGR-P drive bipolar stepper motors?

No - MP6605DGR-P is designed exclusively for unipolar stepper motors with center-tapped windings. It lacks H-bridge topology or high-side drive capability required for bipolar motor phase reversal. For bipolar steppers, MPS recommends the MP6500 or MP6612C families, which integrate dual half-bridge drivers per channel.

How does the OCP circuit respond during transient overloads?

The OCP circuit triggers only if current exceeds the 1.5A minimum threshold for longer than 3.5 µs (deglitch time). Short transients - such as capacitive inrush or PWM edge spikes - are ignored. Upon trip, only the affected channel shuts down; others remain active, and nFAULT pulls low. Recovery occurs automatically after ~2.5ms if the fault clears.

Is an external pull-up resistor required for the nFAULT pin?

Yes - nFAULT is an open-drain output and requires an external pull-up resistor (typically 4.7kΩ to 3.3V or 5V) to generate a valid logic-high signal when no fault is present. Without it, nFAULT remains floating and cannot indicate normal operation reliably. The pull-up also enables wired-OR connection of multiple MP6605DGR-P devices to a single MCU interrupt line.

What is the role of the SLEEP pin during power-up sequencing?

The SLEEP pin defaults to low (due to internal pull-down), enabling normal operation immediately after VIN ramp-up. If pulled high during startup, the device enters sleep mode with IQ reduced to 2–5 µA and all outputs disabled until SLEEP is pulled low. There is a 1ms stabilization delay before outputs respond to INx commands after exiting sleep mode.

Does MP6605DGR-P require a separate logic supply voltage?

No - the MP6605DGR-P accepts 3.3V or 5V logic levels directly on IN1–IN4, nENBL, and SLEEP pins without auxiliary VIO supply. Input thresholds are defined at 0.7V (low) and 2.3V (high), with 560mV hysteresis, ensuring noise immunity across both logic families. This simplifies interface design with modern microcontrollers.

How many thermal vias are recommended under the exposed pad?

MPS recommends ≥6 thermal vias (0.3mm diameter, 0.5mm pitch) under the exposed pad (Pin 7/EP) connected to an internal or bottom-layer GND plane. This configuration achieves the specified θ_JA = 42°C/W on a 4-layer PCB. Fewer vias increase junction temperature and may trigger thermal shutdown under sustained 1.5A loads.