Monolithic Power Systems Inc. MP8040DN-LF-P

Overview

MP8040DN-LF-P from Monolithic Power Systems is a high-current, high-frequency half-bridge power driver IC integrating matched 0.1Ω N-channel MOSFETs, delivering ±9A peak and ±4.25A continuous output current with cycle-by-cycle current limiting, thermal shutdown at 160°C, and fault flag reporting. It operates from 7.5V to 24V input, supports up to 1.2MHz switching, and is used in Class D audio amplifiers and motor drivers.

For engineers reviewing the MP8040DN-LF-P datasheet, MP8040DN-LF-P pinout, MP8040DN-LF-P application, or MP8040DN-LF-P equivalent, key selection criteria include its true 2-quadrant sourcing/sinking capability, bootstrap-based high-side drive architecture, integrated UVLO (6.5V threshold), 2.5µA shutdown current, and SOIC-8N exposed-pad thermal performance.

Technical Context

The MP8040DN-LF-P implements a self-contained half-bridge gate driver with internal charge pump bootstrap circuitry for high-side N-MOSFET operation, enabling true 2-quadrant conduction without external high-voltage level shifters. Its logic-compatible PWM input directly controls high- and low-side switches with 40ns dead time to prevent shoot-through.

Protection is implemented at silicon level: cycle-by-cycle current limit triggers at ±9A, thermal shutdown activates at 160°C with 20°C hysteresis, and under-voltage lockout disables operation below 6.5V on SP. The FLT pin provides open-drain fault signaling tied to overcurrent, overtemperature, or UVLO events.

Key Specifications

Pinout & Package

MP8040DN-LF-P uses an SOIC-8N package with exposed thermal pad on the underside, electrically connected to Pin 4 (GND). The exposed pad must be soldered to a PCB ground plane for optimal thermal resistance (θ_JA = 50°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP8040DN-LF-P, MP8042DN-LF-P offers integration density at the cost of flexibility and power efficiency, while IR2104S trades built-in protection and simplicity for design adaptability and higher voltage tolerance.

Availability

MP8040DN-LF-P is available at Aetrix Electronics and suitable for Class D audio amplifiers, brushed DC motor controllers, synchronous buck regulators, and CCFL backlight drivers requiring stable component supply, consistent thermal performance, and production-ready protection features.

Supply support for MP8040DN-LF-P 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, headquartered in California and serving global power management markets since 1997.

The MP8040 belongs to MPS's high-current integrated half-bridge driver product line, designed specifically for space-constrained, thermally demanding applications such as portable audio, industrial motion control, and high-efficiency DC-DC conversion.

FAQ

What is the minimum recommended bootstrap capacitor value for MP8040DN-LF-P?

The datasheet specifies a minimum of 0.1µF ceramic capacitor between BS and SW pins. For reliable high-duty-cycle or high-frequency operation, a 0.22µF X7R capacitor placed within 2mm of the IC is recommended to maintain sufficient charge during extended high-side conduction periods.

Can MP8040DN-LF-P drive a 48V bus?

No. The absolute maximum SP voltage is 28V, and recommended operating range is 7.5V to 24V. Applying 48V exceeds rating and will cause permanent damage. For 48V systems, consider gate drivers like MP6540 or IR2104 paired with discrete 60V+ MOSFETs.

How does the MP8040DN-LF-P handle shoot-through prevention?

It implements fixed 40ns dead time between high-side turn-off and low-side turn-on (and vice versa), enforced internally by logic circuitry. This prevents simultaneous conduction without requiring external timing components or microcontroller intervention.

Is the FLT pin internally pulled up?

No. FLT is an open-drain output with no internal pull-up. It must be externally pulled up-typically to DRV (5V) via a 100kΩ resistor-to generate a valid logic-high when no fault is present.

Does MP8040DN-LF-P support 100% duty cycle operation?

No. Due to bootstrap architecture, the high-side MOSFET cannot remain continuously on. Maximum achievable high-side duty cycle is 99.5%, limited by periodic low-side conduction needed to recharge the BS–SW capacitor every 300µs.

What is the thermal pad connection requirement?

The exposed pad on the SOIC-8N package must be soldered to a dedicated PCB copper pour connected to Pin 4 (GND). Minimum pad size is 5.4mm × 3.5mm; insufficient thermal land area increases θ_JA beyond 50°C/W and risks thermal shutdown under load.

Can SHDN be left floating?

No. SHDN is an active-low input with weak internal pull-down (~100kΩ), but floating operation is unreliable and may cause intermittent enable/disable behavior. Always tie SHDN to GND for normal operation or drive actively with logic.