Monolithic Power Systems Inc. MP8046DF-LF-Z

Overview

MP8046DF-LF-Z from Monolithic Power Systems is a 28V, 5A dual-channel power half-bridge IC configurable as full-bridge or stereo half-bridge output stage for Class-D audio amplifiers. It integrates protected 165mΩ power switches, supports up to 600kHz switching, delivers 40W BTL output at 24V/8Ω, and features fault flag, thermal shutdown, and 30ns dead time.

For engineers reviewing the MP8046DF-LF-Z datasheet, MP8046DF-LF-Z pinout, MP8046DF-LF-Z application, or MP8046DF-LF-Z equivalent, key selection criteria include peak current capability (±5A), bootstrap gate drive architecture, dual independent PWM control, fault reporting via open-drain FAULT pin, and TSSOP20F package with exposed pad for thermal management.

Technical Context

The MP8046 operates as a dual high-voltage half-bridge driver with independent PWM1/PWM2 inputs controlling complementary high-side/low-side switching per channel. Each channel uses internal bootstrap supplies (BST1/BST2) and dedicated gate drive regulators (VDR1/VDR2) to sustain high-side conduction without external high-side drivers.

Protection is implemented at silicon level: overcurrent detection triggers immediate MOSFET shutdown with foldback recovery, while thermal shutdown activates at 150°C with 20°C hysteresis. Fault status is reported asynchronously on an open-drain FAULT pin, asserted low on either channel's overcurrent or thermal event.

Key Specifications

Pinout & Package

The MP8046DF-LF-Z is housed in a 20-pin TSSOP package with exposed thermal pad (TSSOP20F), optimized for PCB heat dissipation (θ_JA = 40°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TB6612FNG and L99H02, the MP8046DF-LF-Z uniquely combines 28V operation, integrated bootstrap regulation, single-supply logic interface, and unified fault reporting - making it optimal for cost-sensitive, space-constrained 20–40W Class-D and industrial half-bridge designs.

Availability

MP8046DF-LF-Z is available at Aetrix Electronics and suitable for Class-D audio amplifiers, brushed DC motor controllers, industrial DC-DC power stages, and ultrasonic transducer drivers requiring stable component supply across production lifecycles.

Supply support for MP8046DF-LF-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 core expertise in DC-DC conversion, motor control, and Class-D audio solutions.

The MP8046 belongs to MPS's high-voltage power half-bridge product line, designed specifically for efficient, integrated output stages in audio, motor, and industrial power applications demanding ±5A drive capability and robust fault protection.

FAQ

What is the maximum recommended PCB copper area for thermal management of the MP8046DF-LF-Z?

The exposed thermal pad must be soldered to a minimum 1"² (2.54 cm²) solid copper pour on the PCB, using ≥4 thermal vias (0.3mm diameter) connecting to inner or bottom ground planes. This achieves the specified θ_JA = 40°C/W and prevents junction temperature exceedance at full 5A load.

Can MP8046DF-LF-Z operate with a single 24V supply for both channels?

Yes - VDD1 and VDD2 can be tied together to a common 24V rail. The device supports independent or shared supply configurations. However, separate bypassing (≥10µF ceramic + bulk electrolytic) is required at each VDD pin to maintain local supply stability during high di/dt switching events.

How does the FAULT pin behave during simultaneous overcurrent on both channels?

The FAULT pin is OR'ed across both channels: a fault on either channel pulls FAULT low. Only the affected channel enters high-impedance state; the other continues normal operation unless its own fault condition occurs. No latching - FAULT returns high when both channels clear faults.

Is external bootstrap diode required for MP8046DF-LF-Z?

No - the MP8046 integrates internal bootstrap diodes. External components required are only the BST-to-OUT capacitors (≥0.1µF X7R ceramic). Adding external diodes is unnecessary and may interfere with internal refresh timing.

What is the minimum PWM pulse width supported for reliable switching?

The device guarantees proper switching down to 200ns high or low pulses, as verified in electrical characteristics. For stable Class-D audio operation, PWM frequencies above 300kHz are recommended to push switching harmonics beyond audible range while maintaining sufficient resolution.

Does STBY mode preserve gate drive bias during idle?

Yes - in STBY mode (STBY = low), both outputs go high-impedance, but internal regulators (VDR1/VDR2) remain active and bootstrap capacitors retain charge. Recovery to full operation takes <100µs after STBY goes high, with no recharging delay.

How is current limiting implemented per MOSFET leg?

Each high-side and low-side MOSFET has independent current sensing. If sensed current exceeds 5A, that specific FET shuts off immediately and its complement turns on to clamp the node. If current persists, foldback reduces drive strength to limit energy dissipation before thermal shutdown intervenes.