Monolithic Power Systems Inc. MP6515GF

Overview

MP6515GF from Monolithic Power Systems is a 35V, 2.8A peak-current H-bridge motor driver in TSSOP-16 EP (5.0mm × 6.4mm) package, integrating four N-channel MOSFETs with 250mΩ HS/LS R_DS(on). It uses PHASE/ENABLE logic control and provides internal current sensing via VISEN output (1.5V trip threshold), cycle-by-cycle current regulation, and fault reporting via open-drain nFAULT. It drives DC brush motors in industrial actuators requiring robust over-current, over-voltage, UVLO, and thermal protection.

For engineers reviewing the MP6515GF datasheet, MP6515GF pinout, MP6515GF application, or MP6515GF equivalent, key selection considerations include its 5.4–35V input range, integrated current-sense scaling (100µA/A at ISET), 16µs off-time current regulation, 1.5A typical continuous output (PCB-dependent), and compatibility with 3.3V/5V logic interfaces in space-constrained motor control designs.

Technical Context

The MP6515GF implements constant off-time PWM current regulation triggered when VISEN reaches 1.5V, with fixed 16µs blanking time to suppress turn-on current spikes. Its gate drive uses an internal charge pump (680kHz) to sustain high-side N-MOSFET operation across the full 5.4–35V VIN range.

Control logic decodes PHASE, ENBL, BRAKE, and BMODE inputs to configure forward/reverse/brake (low/high) and sync fast-decay modes. Fault detection is independent of current regulation - OCP, OTP, and OVP each assert open-drain nFAULT without latching, enabling automatic retry after 0.9ms.

Key Specifications

Pinout & Package

TSSOP-16 EP (5.0mm × 6.4mm) with exposed thermal pad (EP) tied to GND; requires minimum 100nF ceramic VIN decoupling and 100nF CPA–CPB flying capacitor.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TB6612FNG and DRV8876N, the MP6515GF delivers optimal balance of analog simplicity, 24V industrial compatibility, and embedded current telemetry - ideal for GPIO-driven systems needing deterministic stall detection without SPI overhead or external sensing components.

Availability

MP6515GF is available at Aetrix Electronics and suitable for industrial valve actuators, automotive HVAC blowers, medical infusion pumps, and robotic grippers requiring stable component supply across extended production lifecycles.

Supply support for MP6515GF 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 across Asia and North America.

The MP6515 belongs to MPS's motor driver product line, engineered for cost-sensitive, thermally constrained DC motor control applications where integration of gate drive, protection, and current sensing reduces bill-of-materials and layout complexity.

FAQ

What is the maximum continuous output current for MP6515GF at +85°C ambient?

The MP6515GF delivers ±1.5A continuous output current at +25°C ambient on a standard 4-layer PCB. At +85°C ambient, derating applies: with θ_JA = 45°C/W and T_J(MAX) = 125°C, maximum allowable power dissipation drops to ~0.89W, limiting practical continuous current to approximately ±0.9A under typical board conditions.

How does the ISET resistor value affect current regulation accuracy?

The ISET resistor sets the VISEN scaling factor (100µA per ampere). For example, a 10kΩ resistor yields 1V/A, so 1.5A load produces 1.5V at VISEN - triggering regulation. Accuracy depends on resistor tolerance and temperature coefficient; a 1% metal-film resistor maintains ±1.5% current trip error across –40°C to +125°C junction range.

Can MP6515GF drive a bipolar stepper motor in full-step mode?

Yes - the MP6515GF can drive one winding of a bipolar stepper motor using external logic to sequence PHASE/ENBL/BRAKE. However, it is not a dedicated stepper driver: microstepping, coil current balancing, and phase timing must be managed externally, and simultaneous dual-winding control requires two MP6515GFs.

Is the nFAULT pin latched or auto-recovering after over-temperature shutdown?

The nFAULT pin is auto-recovering: it asserts low during thermal shutdown (T_J ≥ 165°C) and releases high once die temperature falls below 135°C (165°C – 30°C hysteresis). No reset or command is required - the device resumes normal operation automatically after cooldown.

What external capacitors are mandatory for stable MP6515GF operation?

Three capacitors are mandatory: (1) ≥100nF ceramic between VIN and GND (close to pins 9/10), (2) 100nF ceramic between CPA and CPB (pins 11/12), and (3) 100nF ceramic between VCP and VIN (pin 14). Omitting any causes gate drive failure, erratic current regulation, or immediate fault assertion.

Does MP6515GF support 3.3V-only logic interfaces without level shifting?

Yes - MP6515GF accepts 3.3V logic directly: VIH(min) = 2.0V and VIL(max) = 0.8V, with input leakage <±20µA. Its internal 515kΩ pull-downs ensure defined states when GPIOs float, eliminating need for external bias resistors in 3.3V MCU designs.