Monolithic Power Systems Inc. MP6519GQ-P

Overview

MP6519GQ-P from Monolithic Power Systems is a monolithic H-bridge current regulator IC with integrated 4-MOSFET topology, delivering up to 5A bidirectional output current across a 2.5V–28V input range, ±2% full-scale current accuracy, and programmable 30kHz–300kHz switching frequency for precision motor and solenoid control in industrial actuators.

For engineers reviewing the MP6519GQ-P datasheet, MP6519GQ-P pinout, MP6519GQ-P application, or MP6519GQ-P equivalent, key selection criteria include its 65mΩ R_DS(ON) per MOSFET, selectable current polarity via MODE pin, 1μA shutdown current, cycle-by-cycle OCP, and QFN-19 (3mm×3mm) thermal performance with θ_JA = 50°C/W.

Technical Context

The MP6519GQ-P implements average-current-mode control using an internal transconductance error amplifier (G_EA = 270µA/V) and sawtooth PWM comparator to regulate load current against a programmable reference set by ISET. Its four-NMOS H-bridge operates with 25ns dead time and 200ns minimum on-time to prevent shoot-through while enabling 100% duty-cycle operation via integrated bootstrap drivers (BSTP/BSTN).

Current polarity is determined by the MODE pin logic level, defining LP→LN as positive or LN→LP as negative flow; fault detection is reported via open-drain FAULT with latch-off or hiccup recovery based on over-current magnitude (13A latch threshold, 300mV hiccup threshold), complemented by input OVP (30V), OTP (150°C), and inherent open-load protection.

Key Specifications

Pinout & Package

MP6519GQ-P is housed in a thermally enhanced QFN-19 (3mm × 3mm, 0.5mm pitch) package with exposed thermal pad, optimized for high-current density and low-inductance layout. Pin 1 is marked by a dot; pins 2/3/10/11/12 share identical land pattern geometry per JEDEC MO-220.

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-P uniquely combines QFN-19 compactness, 5A capability, 100% duty cycle, and MODE-selectable polarity-making it optimal for space-limited industrial actuators needing fast, accurate bidirectional current control without microcontroller overhead.

Availability

MP6519GQ-P is available at Aetrix Electronics and suitable for industrial actuators, DC motor control, solenoid drivers, and automated test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MP6519GQ-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 analog and power ICs, with core expertise in DC-DC conversion, motor control, and LED drivers.

The MP6519 product line targets precision current-regulated H-bridge applications in industrial automation and electromechanical systems, emphasizing integration, thermal efficiency, and robust fault protection without external components.

FAQ

What is the minimum input voltage required for MP6519GQ-P to operate?

The MP6519GQ-P requires a minimum input voltage of 2.5V to initiate regulation and maintain stable operation. Below this threshold, the internal bandgap and control circuits cannot power up reliably. The VCC LDO remains functional down to VIN ≈ 2.3V, but full H-bridge switching ceases below 2.5V per absolute maximum ratings and startup behavior described in the datasheet.

How does the MODE pin affect current direction and what logic levels are valid?

When MODE is pulled high (>1.5V), current flows from LP to LN (positive polarity); when pulled low (<0.4V), current flows from LN to LP (negative polarity). The pin includes 150ns deglitching to reject noise. Floating MODE is undefined and must be avoided - tie to VCC or GND via ≥10kΩ resistor for deterministic operation.

Can MP6519GQ-P drive inductive loads without external flyback diodes?

Yes. The integrated four-NMOS H-bridge provides synchronous rectification and internal freewheeling paths, eliminating the need for external flyback diodes. Energy recirculation occurs through the low-side MOSFETs during off-time, minimizing voltage spikes and improving efficiency - confirmed by typical waveforms showing clean LP/LN node transitions under inductive load.

What is the purpose of the three parallel ISEN pins and how should they be connected?

Pins 6, 7, and 8 are electrically connected internally as a single ISEN node to reduce parasitic resistance and inductance in the current-sense return path. They must be tied together with a low-impedance trace and connected to the ground side of the external current-sense resistor (R_SENSE) - never split or routed separately, as doing so degrades accuracy and noise immunity.

How does the FAULT pin behave during over-temperature events?

During junction temperature exceeding 150°C, the FAULT pin is actively driven low and remains latched until either the EN pin is toggled (low then high) or input power is cycled. Thermal hysteresis of 20°C ensures the device resumes operation only after die temperature falls below 130°C, preventing rapid thermal cycling and ensuring stable restart.

Is the MP6519GQ-P compatible with 3.3V logic-level microcontrollers?

Yes. All digital inputs (EN, MODE, PWM, FREQ) have TTL-compatible thresholds: VIH = 1.5V min and VIL = 0.4V max. A 3.3V MCU GPIO can directly drive these pins without level-shifting; however, ensure the MCU's output drive strength meets the 1µA input leakage spec and that trace capacitance stays below 50pF to preserve signal integrity at 100kHz PWM edges.

What is the recommended layout practice for the AGND and power ground connections?

AGND (pin 19) must be connected to the system power ground at a single point near the ISEN/IFB sense resistor location - not at the VIN decoupling capacitors or VCC LDO output. This star-ground topology prevents switching noise from corrupting the current-sense signal, preserving ±2% accuracy. Use multiple vias to the inner ground plane beneath the QFN thermal pad for lowest impedance.