Monolithic Power Systems Inc. MP6612GF-Z

Overview

MP6612GF-Z from Monolithic Power Systems is a 40V, 5A H-bridge DC motor driver IC with integrated current sensing, cycle-by-cycle current regulation, and full protection suite (OCP/OVP/UVLO/OTP). It drives brushed DC motors, stepper windings, or solenoids using four N-channel MOSFETs and an internal charge pump for 100% duty-cycle operation. Key confirmed specs: 4–40V input range, 5A continuous output, 70mΩ HS/45mΩ LS R_DS(ON), 10% current-sense accuracy, and TSSOP-20EP package.

For engineers reviewing the MP6612GF-Z datasheet, MP6612GF-Z pinout, MP6612GF-Z application, or MP6612GF-Z equivalent, this device supports precise bidirectional motor control in space-constrained industrial actuators, automotive door latches, and robotic joint drivers-where integrated current feedback, low quiescent current brake mode, and fault reporting are critical design requirements.

Technical Context

The MP6612GF-Z implements a constant-off-time PWM current regulation architecture triggered when the ISET pin reaches 1.5V (rising), enabling configurable current limiting without external shunt resistors. Its internal charge pump generates gate-drive voltage for all four N-channel MOSFETs, eliminating external high-side drivers.

Control logic uses IN1/IN2 inputs (MP6612 variant) to define forward/reverse/coast/brake states, with dedicated nSLEEP for ultra-low-power sleep mode (<1μA shutdown current) and open-drain nFAULT for real-time OCP/OVP/OTP fault indication. The VISEN output provides a voltage proportional to load current with ±5% accuracy across temperature.

Key Specifications

Pinout & Package

TSSOP-20EP package with exposed thermal pad soldered to PGND for enhanced power dissipation (θ_JA = 40°C/W on 4-layer PCB). Pin numbering follows JEDEC MO-153 standard; top marking includes MPS prefix, year/week code, and "MP6612".

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, MP6612GF-Z uniquely balances wide 4–40V operation, 5A drive, analog current feedback, and minimal external components-making it optimal for standalone, thermally constrained industrial actuators where simplicity and robustness are prioritized over digital control or ultra-low cost.

Availability

MP6612GF-Z is available at Aetrix Electronics and suitable for automotive door latch systems, industrial conveyor drives, robotic joint positioners, and smart home blind controllers requiring stable component supply across extended production lifecycles.

Supply support for MP6612GF-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 power management ICs, with over two decades of expertise in DC-DC converters, motor drivers, and LED controllers.

The MP6612 product line targets compact, high-efficiency bidirectional motor control in space- and thermal-constrained applications-designed specifically for industrial actuators, automotive accessories, and consumer robotics needing integrated protection and current feedback.

FAQ

What is the difference between MP6612GF-Z and MP6612DGF-Z?

MP6612GF-Z uses IN1/IN2 logic inputs for H-bridge control (forward/reverse/coast/brake), while MP6612DGF-Z uses ENBL/DIR inputs (enable/direction). Both share identical electrical specs, package, protection features, and current-sense architecture-only the control interface differs. Pin 3 is IN1 on GF-Z and ENBL on DGF-Z; pin 4 is IN2 on GF-Z and DIR on DGF-Z.

How do I configure the current limit threshold?

Connect a resistor between the ISET pin and AGND. The device sources 100μA per ampere of desired current limit; for example, a 5kΩ resistor sets a 1.5V trip point at 3A (100μA × 3A = 300μA → 300μA × 5kΩ = 1.5V). Leaving ISET open disables current limiting. Ensure AGND is low-impedance and tied to PGND.

Can MP6612GF-Z drive a stepper motor?

Yes-it can drive one bipolar stepper motor winding pair (full H-bridge per phase) with external sequencing logic. Each MP6612GF-Z controls one phase; two devices are required for full 2-phase bipolar operation. Its 5A rating supports stepper motors up to ~1.8A phase current with appropriate derating for thermal management.

What is the purpose of the nSLEEP pin, and what happens during sleep mode?

nSLEEP disables all internal circuitry-including gate drivers, charge pump, and logic-reducing supply current to <1μA. Outputs go to high-impedance (Z), inputs are ignored, and fault reporting halts. Wake-up requires >100ns high pulse on nSLEEP, followed by 500μs tDELAY before outputs become active again.

Does MP6612GF-Z require external Schottky diodes across the motor terminals?

No-its four N-channel MOSFETs provide synchronous rectification during decay modes, eliminating need for external flyback diodes. The internal body diodes and controlled slow-decay (brake) mode handle inductive kickback efficiently, reducing board area and thermal stress versus discrete diode solutions.

How does the current-sense output (VISEN) scale with load current?

VISEN voltage equals (I_LOAD × R_ISET) × (100μA/A), where R_ISET is the resistor from ISET to AGND. For instance, with R_ISET = 5kΩ, VISEN = 0.5V per ampere of load current. Accuracy is ±5% over temperature, and VISEN must drive ≤2mA load with <500pF capacitance for stability.

What thermal design practices are recommended for 5A continuous operation?

Use a 4-layer PCB with ≥2oz copper on PGND/VIN/OUT layers, solder the exposed thermal pad directly to a large PGND plane, and place ≥8 thermal vias (0.3mm diameter) under the pad connecting to inner ground planes. Maintain ambient temperature ≤70°C and verify junction temperature stays below 125°C using θ_JA = 40°C/W.