Monolithic Power Systems Inc. MPQ8039GN

Overview

MPQ8039GN from Monolithic Power Systems is an AEC-Q100 qualified high-current half-bridge power driver integrating 100mΩ high-side and low-side N-channel MOSFETs, delivering ±9A peak and ±4.25A continuous output current with up to 1.2MHz switching frequency, wide 7.5V–25V input range, and true 2-quadrant sourcing/sinking operation for automotive-grade motor and audio amplification.

For engineers reviewing the MPQ8039GN datasheet, MPQ8039GN pinout, MPQ8039GN application, or MPQ8039GN equivalent, key selection criteria include cycle-by-cycle current limiting, integrated UVLO and thermal shutdown, 2.5μA standby current, SOIC8E package with exposed pad, and compatibility with standard logic-level PWM inputs in Class D audio, DC-DC regulators, and brushed DC motor control.

Technical Context

The MPQ8039GN implements a bootstrap-gated high-side drive architecture where BS supplies gate voltage above SP via an external capacitor, enabling full N-channel half-bridge operation without P-channel devices. Its internal 5V regulator powers DRV and gate drivers, while dead time (~40ns) prevents shoot-through during PWM transitions.

Current protection operates independently on both switches using cycle-by-cycle sensing; fault detection asserts a low signal (not exposed externally but disables outputs). Thermal shutdown activates at 160°C with 20°C hysteresis, and under-voltage lockout triggers at 5.5V (rising) to prevent unstable operation below minimum SP.

Key Specifications

Pinout & Package

MPQ8039GN uses the SOIC8E (SOIC8N with exposed thermal pad) package, measuring 5.0mm × 6.2mm × 1.7mm, with Pin 4 (GND) and the bottom-side exposed pad electrically connected for optimal thermal dissipation (θJA = 48°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ8039GN, the MPQ8039GN-AEC1 offers enhanced thermal margin and qualification rigor for under-hood use, while MP8039GN provides identical performance at lower cost for non-automotive applications-enabling tiered sourcing without redesign.

Availability

MPQ8039GN is available at Aetrix Electronics and suitable for automotive infotainment systems, brushed DC motor control in body electronics, and high-frequency DC-DC converters requiring stable component supply, AEC-Q100 compliance, and long-term production support.

Supply support for MPQ8039GN 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 and global distribution through authorized partners.

The MPQ8039 belongs to MPS's automotive-qualified power driver product line, engineered specifically for high-current, high-reliability half-bridge applications in vehicle electrification, including ADAS, body control, and infotainment subsystems.

FAQ

What is the maximum allowable voltage on the BS pin relative to SW?

The absolute maximum BS-to-SW voltage is +6V per the datasheet's Absolute Maximum Ratings table. Exceeding this risks gate oxide damage to the high-side driver. A 0.1μF ceramic capacitor rated for ≥16V is recommended between BS and SW to maintain safe voltage swing during bootstrap charging cycles.

Does MPQ8039GN require an external bootstrap diode?

No. The MPQ8039GN integrates an internal bootstrap diode that charges the BS capacitor when the low-side switch is active. External diodes are unnecessary and may interfere with internal timing; only a single 0.1μF or larger ceramic capacitor between BS and SW is required.

How does the current limit behave during PWM transitions?

The current limit operates cycle-by-cycle on both high-side and low-side switches independently. If overcurrent occurs during either phase, both switches turn off immediately for that cycle, and operation resumes normally on the next PWM edge-no latching or manual reset is needed.

Can MPQ8039GN drive inductive loads without external freewheeling diodes?

Yes. The integrated N-channel MOSFETs provide synchronous rectification, eliminating the need for external flyback diodes. Internal body diodes handle reverse recovery, and the device's current limit protects against inductive kickback during turn-off.

What is the purpose of the DRV pin, and how should it be decoupled?

DRV supplies regulated 5.1–6.0V to internal logic and gate drivers, sourced from SP via an internal LDO. It must be bypassed to GND with a 0.1–10μF ceramic capacitor placed within 2mm of the pin to suppress switching noise and ensure stable gate drive voltage during high di/dt events.

Is there a minimum PWM frequency requirement for reliable bootstrap capacitor charging?

Yes. The internal bootstrap charging circuit requires at least one low-side conduction period every 300μs to replenish BS charge. Therefore, PWM frequencies below ~3.3kHz may cause BS undervoltage and high-side dropout; operation down to 10kHz is strongly recommended for robustness.

How is thermal performance affected by the exposed pad connection?

The exposed pad on the SOIC8E package is electrically tied to Pin 4 (GND) and serves as the primary thermal path. Soldering it to a ≥1cm² copper pour with ≥4 thermal vias significantly reduces θJA from 48°C/W to ~35°C/W, enabling full 4.25A continuous output without derating at TA = 85°C.