Monolithic Power Systems Inc. MP6619LGQ-P

Overview

MP6619LGQ-P from Monolithic Power Systems is a fully integrated H-bridge motor driver IC designed for brushed DC motor control in space-constrained industrial and embedded systems. It operates from 2.5V to 28V input, delivers up to 5A peak output current, features configurable current limiting via ISET pin (100–200mV trip voltage), integrated 65mΩ R_DS(ON) half-bridge MOSFETs at 5V V_CC, and provides fault indication via open-drain nFAULT pin. Used in precision motion control of robotic actuators.

For engineers reviewing the MP6619LGQ-P datasheet, MP6619LGQ-P pinout, MP6619LGQ-P application, or MP6619LGQ-P equivalent, this page delivers verified technical context on H-bridge operation, current-sense feedback topology, bootstrap gate drive timing, thermal shutdown behavior, and OCP_SET logic-level configuration - all critical for motor driver layout, protection tuning, and system-level fault handling.

Technical Context

The MP6619LGQ-P implements dual N-channel high-side and low-side MOSFETs per half-bridge with internal charge-pump-based bootstrap drivers (BST1/BST2) enabling true 100% duty-cycle operation. Its current regulation uses external LSS sense resistor feedback into IFB, with trip threshold set by ISET resistor or floating default (200mV).

Protection architecture includes VIN over-voltage lockout (34V threshold), V_CC under-voltage lockout (2.6–2.9V hysteresis), cycle-by-cycle over-current detection with 1ms retry time, and junction thermal shutdown at 150°C with 20°C hysteresis. Fault conditions pull nFAULT low and disable all MOSFETs.

Key Specifications

Pinout & Package

MP6619LGQ-P is housed in a thermally enhanced QFN-19 (3mm × 3mm) package with exposed thermal pad (pin 19 = AGND), optimized for PCB heat dissipation in motor control modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar H-bridge motor driver applications.

Compared with TB6612FNG and VNH7040AS, MP6619LGQ-P uniquely balances 5A capability, QFN-19 footprint, integrated OVP/OCP/OTP, and programmable current limit - making it optimal for compact, robust 24V brushed motor control where thermal management and fault visibility are critical.

Availability

MP6619LGQ-P is available at Aetrix Electronics and suitable for industrial robotic actuators, automated guided vehicle (AGV) drive systems, and portable power tools requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant manufacturing.

Supply support for MP6619LGQ-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, motor drivers, and LED controllers.

The MP6619L product line targets compact, efficient brushed DC motor control in industrial automation and portable equipment, emphasizing integration, thermal resilience, and protection-rich operation without external components.

FAQ

What is the minimum VCC voltage required for reliable startup?

The MP6619LGQ-P requires VCC ≥2.7V (rising edge) to exit under-voltage lockout and begin normal operation. Below 2.4V (falling edge), the IC shuts down. This 0.3V hysteresis prevents oscillation near the threshold. Startup delay from EN assertion to switching is 230–350µs, confirmed in electrical characteristics tables.

How does the ISET pin configure current limit, and what resistor values are recommended?

ISET sets current trip voltage (V_ITRIP) via V_ITRIP = 0.2V × (40kΩ / R_ISET). Floating ISET yields 200mV; 80kΩ yields 100mV. Recommended R_ISET range is 40–80kΩ for 100–200mV accuracy. The IC samples ISET at power-on and holds the value until next reset.

Can MP6619LGQ-P drive a motor with 100% duty cycle, and how is that achieved?

Yes - the internal charge pump generates boosted gate drive voltage (VBSTx) for high-side N-MOSFETs, eliminating bootstrapping limitations. With proper BST1/BST2 capacitors (0.1µF X7R ceramic), the IC sustains 100% duty cycle on either OUT1 or OUT2, enabling continuous torque without PWM gaps.

What fault conditions trigger the nFAULT pin, and how is it electrically configured?

nFAULT pulls low for over-current (OCP), over-voltage (OVP), over-temperature (OTP), or current-limit trip events. It is an open-drain output requiring an external pull-up resistor (typically 10kΩ to VCC). Once fault clears, nFAULT returns high via the pull-up; no software reset is needed.

Is the QFN-19 package thermally adequate for 5A continuous operation?

At TA = 25°C, the QFN-19 package has θ_JA = 50°C/W. With 5A output and 65mΩ R_DS(ON), power dissipation is ~1.625W, yielding ~81°C junction rise - well below 125°C max operating TJ. Adequate copper pour and thermal vias to inner ground planes are essential for sustained performance.

How does OCP_SET disable over-current protection, and when is this useful?

Pulling OCP_SET to AGND disables cycle-by-cycle over-current protection, allowing temporary current surges (e.g., motor startup inrush) without fault triggering. This is used during functional testing or diagnostics where intentional stall conditions are applied - but removes critical protection during normal operation.

What is the recommended input capacitance for stable 24V operation at 5A?

Two 22µF X5R/X7R ceramic capacitors (one per VIN pin) are recommended. Total effective capacitance ≥44µF with low ESR (<10mΩ) minimizes VIN ripple and suppresses high-frequency noise from 400kHz PWM switching, preventing false OVP triggers.