Monolithic Power Systems Inc. MP6519GQ-Z

Overview

MP6519GQ-Z from Monolithic Power Systems is a monolithic H-bridge current regulator IC designed for bidirectional, high-accuracy load current control in DC motor and solenoid drive applications. It delivers up to 5A output current with ±2% full-scale reference accuracy, operates from 2.5V–28V input, integrates four MOSFETs with 65mΩ R_DS(ON), and supports 30kHz–300kHz programmable switching frequency.

For engineers reviewing the MP6519GQ-Z datasheet, MP6519GQ-Z pinout, MP6519GQ-Z application, or MP6519GQ-Z equivalent, key selection criteria include its integrated H-bridge topology, polarity-selectable MODE control, PWM-based current dimming (20–100kHz), cycle-by-cycle OCP, and QFN-19 (3mm×3mm) thermal performance with θ_JA = 50°C/W.

Technical Context

The MP6519 implements a step-down, average-current-controlled H-bridge using four internal N-channel MOSFETs with bootstrap gate drivers enabling 100% duty-cycle operation. Its error amplifier compares sensed current (via ISEN/IFB) against a programmable reference set by ISET resistor, generating COMP voltage for PWM comparator-driven switching.

It features dual protection architecture: hiccup-mode OCP triggers after two overcurrent cycles at >150% full-scale, while latch-off occurs at >200%; OTP shuts down at 150°C with 20°C hysteresis, and input OVP latches off above 30V for four consecutive cycles.

Key Specifications

Pinout & Package

MP6519GQ-Z is housed in a thermally enhanced QFN-19 (3mm × 3mm) package with exposed thermal pad, optimized for high-current density and efficient PCB heat dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar H-bridge current regulator applications.

Compared with TB9051FTG and DRV8876N, MP6519GQ-Z uniquely combines 5A capability, ±2% accuracy, MODE-based polarity control, and 100% duty-cycle support in a single QFN-19 package-making it optimal for space-constrained, high-fidelity industrial actuators requiring analog flexibility and minimal external components.

Availability

MP6519GQ-Z is available at Aetrix Electronics and suitable for DC motor control, solenoid actuation, industrial positioning systems, and medical infusion pumps requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MP6519GQ-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 analog and power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP6519 belongs to MPS's integrated H-bridge current regulator product line, engineered specifically for precision bidirectional current control in electromechanical systems where reliability, thermal efficiency, and analog configurability are critical.

FAQ

What is the minimum recommended input capacitance for MP6519GQ-Z?

Two 22µF X5R/X7R ceramic capacitors-one placed near each VIN pin-are recommended to suppress high-frequency switching noise and limit surge current. Total effective capacitance should exceed 40µF with ESR < 10mΩ at the selected switching frequency to maintain stable input voltage under 5A load transients.

How does the MP6519 handle current sensing without an external op-amp?

MP6519 integrates a precision current-sense amplifier with matched input resistors and a transconductance error amplifier (G_EA = 270µA/V). It uses differential sensing across ISEN pins and IFB feedback to achieve ±2% full-scale accuracy without external gain stages-reducing component count and PCB area while maintaining noise immunity.

Can MP6519GQ-Z drive inductive loads with zero-crossing current reversal?

Yes. The four-MOSFET H-bridge with 25ns dead-time control and bidirectional current sensing supports true zero-crossing reversal. When MODE toggles, the internal control loop reconfigures M1/M4 and M2/M3 switching sequences to reverse current direction without interruption, enabling smooth commutation in stepper-like applications.

What happens during input over-voltage events above 30V?

If VIN exceeds 30V for four consecutive switching cycles, MP6519GQ-Z immediately halts switching and latches off. The FT pin pulls low, and recovery requires cycling EN or power reset. This OVP threshold is fixed and non-adjustable, protecting internal MOSFETs and gate drivers from avalanche breakdown.

Is thermal derating required when operating above 85°C ambient?

Yes. With θ_JA = 50°C/W, junction temperature rises 50°C per watt of dissipated power. At 100°C ambient, maximum allowable power drops to 1W (T_J = 150°C), limiting continuous output current to ~3.2A at 28V input. Use thermal vias under the exposed pad and copper pour to improve θ_JA in production layouts.

Does the COMP pin require external compensation components for stability?

Yes. The COMP pin is the error amplifier output and must be externally compensated with an RC network (R, C_z, C_p) to stabilize the current loop. MPS recommends placing the compensation zero at the load pole (L/R) and the pole near the switching frequency-typical values are R = 10kΩ, C_z = 1nF, C_p = 10pF for 100kHz f_s and 1mH inductive load.

How does standby mode reduce quiescent current during PWM idle periods?

When PWM remains low for >1ms with EN high, MP6519 enters standby mode: gate drivers disable, switching stops, and only bandgap and logic blocks remain active. Quiescent current drops from 450µA to <10µA, minimizing power loss while retaining fast wake-up (<300µs) when PWM resumes.