Monolithic Power Systems Inc. MPQ8039GN-Z

Overview

MPQ8039GN-Z from Monolithic Power Systems is an AEC-Q100 qualified high-current half-bridge power driver integrating 0.1Ω 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-Z datasheet, MPQ8039GN-Z pinout, MPQ8039GN-Z application, or MPQ8039GN-Z equivalent, key selection criteria include cycle-by-cycle current limiting, integrated UVLO (7.5V rising), thermal shutdown (160°C), 2.5μA shutdown current, and SOIC8E package compatibility with exposed thermal pad for high-power density designs.

Technical Context

The MPQ8039GN-Z implements a bootstrap-gated half-bridge architecture where the BS–SW capacitor enables high-side N-MOSFET drive above SP voltage; internal 5V regulator powers DRV and gate drivers, while dead time (~40ns) prevents shoot-through. PWM logic directly controls high-side (PWM high) or low-side (PWM low) conduction.

Protection is implemented at silicon level: per-cycle current limit triggers fault assertion and switch disable, UVLO disables operation below 7.5V SP, and thermal shutdown latches off at 160°C with 20°C hysteresis. SHDN pin enables 2.5μA standby mode with DRV collapse.

Key Specifications

Pinout & Package

The MPQ8039GN-Z is housed in an 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 (θ_JA = 48°C/W, θ_JC = 10°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPQ8039GN-Z, the AEC1 variant adds formal qualification evidence for safety-critical use, while the MP8039 offers identical performance at lower cost where automotive qualification is unnecessary-enabling tiered sourcing based on system-level compliance needs.

Availability

MPQ8039GN-Z is available at Aetrix Electronics and suitable for automotive motor control, Class D audio amplification, DC-DC synchronous buck regulators, and CCFL backlighting requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for MPQ8039GN-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 analog and power ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.

The MPQ8039 belongs to MPS's AEC-Q100 qualified power driver product line, engineered specifically for automotive subsystems demanding high current density, robust protection, and guaranteed operation from –40°C to +125°C.

FAQ

What is the maximum allowable SP voltage for continuous operation?

The MPQ8039GN-Z supports continuous operation up to 24V SP, with absolute maximum rating of 28V for transient spikes only. Operation above 24V risks exceeding safe operating area limits and triggering thermal shutdown during sustained load conditions.

How is the bootstrap capacitor selected for reliable high-side drive?

A minimum 0.1μF ceramic capacitor rated ≥25V must be placed between BS and SW pins, mounted as close as possible to the IC. Larger values (e.g., 0.22μF) improve stability under high-duty-cycle or high-frequency operation but increase startup delay.

Does MPQ8039GN-Z support 3.3V logic-level PWM inputs?

Yes-the PWM input has a 2.4V rising threshold and 1.3V falling threshold, making it fully compatible with 3.3V CMOS logic. No level-shifting is required, and the 200ns minimum pulse width ensures clean switching even at high frequencies.

What happens during current-limit fault condition?

When current exceeds 9A in either sourcing or sinking direction, both MOSFETs turn off immediately, the fault flag is asserted (open-drain low), and the device remains latched off until PWM or SHDN is cycled. No automatic retry occurs to prevent thermal runaway.

Is the exposed thermal pad on SOIC8E electrically connected?

Yes-the exposed pad is internally connected to Pin 4 (GND). It must be soldered to a dedicated PCB ground plane with ≥4 thermal vias (0.3mm diameter) to achieve specified θ_JA = 48°C/W and prevent junction overheating above 4.25A continuous load.

Can MPQ8039GN-Z operate in 100% duty cycle mode?

No-due to bootstrap architecture, the high-side MOSFET requires periodic low-side conduction to recharge the BS–SW capacitor. Maximum achievable duty cycle is 99.5% at 3.3kHz, limiting true 100% DC operation to low-side-only configurations.

What is the purpose of the DRV pin and its recommended bypassing?

DRV supplies regulated 5.1–6.0V to internal gate drivers and logic. A 0.1–10μF ceramic capacitor must be placed between DRV and GND, close to the IC, to stabilize the internal regulator and suppress switching noise that could disrupt PWM timing or cause false current-limit triggers.