Monolithic Power Systems Inc. MP6604AGF-Z

Overview

MP6604AGF-Z from Monolithic Power Systems is a dual H-bridge motor driver IC designed for bipolar stepper and brushed DC motors, operating from 4.5V to 45V input voltage with 2.5A per-phase output current, 150mΩ typical MOSFET on-resistance, integrated OCP/OVP/UVLO/thermal shutdown, and separate IN/EN control per channel.

For engineers reviewing the MP6604AGF-Z datasheet, MP6604AGF-Z pinout, MP6604AGF-Z application, or MP6604AGF-Z equivalent, this device supports precise bidirectional motor control in space-constrained industrial motion systems requiring independent half-bridge enable logic, fault reporting via open-drain nFAULT, and robust protection across wide supply ranges.

Technical Context

The MP6604AGF-Z integrates eight N-channel MOSFETs configured as four independently controllable half-bridges, enabling dual H-bridge (bipolar stepper) or quad half-bridge (solenoid/DC motor) operation. It uses charge-pump-based high-side gate drive (VCP = VIN + 5V) and internal 5V LDO (VREG) for low-side drive.

Control logic includes dedicated AINx/BINx inputs and nAENx/nBENx enables per output, all with internal 100kΩ pull-down resistors. Fault detection triggers latched shutdown on over-current (3–4.5A), over-voltage (45–48V), under-voltage (4.5V rising threshold), or thermal events (165°C), reported via open-drain nFAULT.

Key Specifications

Pinout & Package

TSSOP-28EP package with exposed thermal pad; 0.65mm pitch, 9.8mm × 6.6mm body, JEDEC MO-153 compliant; requires soldering of thermal pad and ≥6 thermal vias for 3.9W power dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TB6612FNG and DRV8825, MP6604AGF-Z uniquely combines 45V operation, 2.5A per phase, independent enable pins, and full protection suite-making it optimal for industrial-grade motion control where supply variation, fault resilience, and topology flexibility are mandatory.

Availability

MP6604AGF-Z is available at Aetrix Electronics and suitable for bipolar stepper motor control, stage lighting actuation, 3D printer motion systems, and laser printer paper feed mechanisms requiring stable component supply across extended temperature and voltage ranges.

Supply support for MP6604AGF-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MP6604A belongs to MPS's motor driver product line, engineered for industrial motion control applications demanding wide input voltage range, integrated protection, and flexible H-bridge configuration without external gate drivers.

FAQ

What is the maximum allowable junction temperature for MP6604AGF-Z?

The absolute maximum junction temperature is 150°C, with thermal shutdown activating at 165°C and hysteresis of 15°C-ensuring automatic recovery at 150°C. The TSSOP-28EP package has θJA = 32°C/W on a 4-layer PCB, allowing 3.9W continuous dissipation at 25°C ambient.

How does the MP6604AGF-Z implement over-current protection?

OCP monitors current through internal sense FETs; if sensed current exceeds 3–4.5A for longer than 1µs (deglitch time), all MOSFETs disable and nFAULT pulls low. Recovery requires pulling nRESET low or cycling VIN-no auto-retry to prevent repeated fault stress.

Can MP6604AGF-Z drive unipolar stepper motors?

No-it is optimized for bipolar stepper motors using dual H-bridge topology. Unipolar steppers require five-wire connection with center-tapped windings and single-ended drive, which this IC does not support; use dedicated unipolar drivers like ULN2003 instead.

What external capacitors are mandatory for stable operation?

Mandatory capacitors include: ≥100nF ceramic per VIN pin (placed adjacent to pins), 100nF between CPA–CPB, 1µF between VCP–VIN, and 1µF between VREG–GND-all X7R dielectric, rated ≥16V. Bulk electrolytic (e.g., 100µF) is recommended near VIN for high-current transients.

Is the nSLEEP function compatible with microcontroller GPIO without level-shifting?

Yes-nSLEEP accepts standard 3.3V or 5V logic levels, has internal pull-down, and draws <100nA when high. Pulling it low places the IC in sub-10µA sleep mode; wake-up delay is fixed at 600µs, during which all outputs remain Hi-Z.

Does MP6604AGF-Z support current regulation or only voltage-mode drive?

It provides only voltage-mode drive with over-current protection-not closed-loop current regulation. For precise current control, external sense resistors and microcontroller-based PWM feedback are required; the IC reports faults but does not adjust duty cycle autonomously.

What is the purpose of the PGNDA and PGNDB pins, and how should they be routed?

PGNDA and PGNDB are dedicated power ground returns for H-bridge A and B, respectively. They must connect directly to the thermal pad and local copper pour, then tie to main system GND at a single point near the IC to minimize ground bounce and ensure accurate OCP sensing.