Monolithic Power Systems Inc. MP8042DF-LF-P

Overview

MP8042DF-LF-P from Monolithic Power Systems is a dual-channel, 24V-rated, ±5A peak current power half-bridge driver IC designed as the output stage for Class-D audio amplifiers and motor control systems. It supports configurable stereo single-ended or bridge-tied load (BTL) operation, integrates 150mΩ power switches, features 30ns dead time, and delivers up to 40W at 24V into 8Ω BTL loads. Its fault flag, thermal shutdown, and current limiting enable robust operation in high-power audio and DC motor drive applications.

For engineers reviewing the MP8042DF-LF-P datasheet, MP8042DF-LF-P pinout, MP8042DF-LF-P application, or MP8042DF-LF-P equivalent, key selection considerations include its dual-channel independent PWM control, integrated bootstrap gate drive, ±5A peak output capability, 600kHz switching frequency support, and fault reporting via open-drain FAULT pin - all critical for Class-D amplifier design and half-bridge motor driver validation.

Technical Context

The MP8042 implements two independent half-bridge drivers with internal high-side and low-side MOSFETs (150mΩ R_DS(on)), each controlled by standard logic-level PWM inputs and supported by dedicated bootstrap supplies (BST1/BST2) and gate drive regulators (VDR1/VDR2). Its dual-channel architecture allows synchronous or complementary switching, with programmable standby and shutdown modes managed via STBY and SHDN pins.

Protection is implemented at silicon level: per-channel current limiting triggers at ±5A, thermal shutdown activates at 150°C (with 20°C hysteresis), and dual UVLO circuits monitor VDD1/VDD2 supply integrity. The FAULT pin provides open-drain fault indication for overcurrent or overtemperature events across either channel.

Key Specifications

Pinout & Package

The MP8042DF-LF-P is housed in a 20-pin TSSOP package with exposed thermal pad (TSSOP20F), optimized for heat dissipation in high-current applications. Pin numbering follows standard top-view orientation with Pin 1 marked by notch or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TB67H420FTG and L99H02, the MP8042DF-LF-P offers superior power density (dual-channel in one TSSOP20F), optimized dead time for audio-class distortion performance, and simpler fault handling - making it ideal for cost-sensitive, high-volume Class-D and 24V motor applications outside automotive qualification scope.

Availability

MP8042DF-LF-P is available at Aetrix Electronics and suitable for Class-D audio amplifiers, 24V DC motor drivers, and industrial half-bridge power stages requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.

Supply support for MP8042DF-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, with core expertise in DC-DC conversion, motor drivers, and Class-D audio solutions.

The MP8042 belongs to MPS's high-voltage power driver product line, engineered specifically for efficient, thermally robust, and fault-resilient half-bridge implementations in audio and motion control systems - not general-purpose logic or signal conditioning.

FAQ

What is the recommended bootstrap capacitor value for MP8042DF-LF-P?

A minimum 0.1µF ceramic capacitor is required between BST1 and OUT1 (and BST2 and OUT2), placed as close as possible to the pins. For 600kHz operation or high-duty-cycle applications, 0.22µF–1µF X7R ceramics improve charge retention and reduce voltage droop during high-side conduction.

Can MP8042DF-LF-P drive a full H-bridge configuration?

Yes - two MP8042 channels can be combined per motor: OUT1 and OUT2 serve as one half-bridge leg, while a second MP8042 provides the complementary leg. Each channel operates independently, enabling true 4-switch H-bridge control with separate PWM inputs and fault reporting per leg.

Does MP8042DF-LF-P require external current sense resistors?

No - the device uses internal current limiting with a fixed ±5A threshold per MOSFET. It does not provide analog current feedback; fault detection is digital (via FAULT pin), and no external sense resistor is needed for basic overcurrent protection.

How does the MP8042 handle bootstrap capacitor refresh?

Every 300µs, the MP8042 briefly turns on the low-side MOSFET for ~300ns to recharge the BST–OUT capacitor. This automatic refresh ensures reliable high-side drive even at 0% or 100% duty cycle, eliminating need for external timing circuitry or complex PWM constraints.

What is the thermal resistance (θ_JA) of the TSSOP20F package?

The specified junction-to-ambient thermal resistance is 40°C/W under standard test conditions (1-inch² 1oz copper). With proper PCB layout - including full connection of the exposed thermal pad to a multi-layer ground plane - actual θ_JA can be reduced to ≤28°C/W, enabling sustained 5A operation at TA = +85°C.

Is MP8042DF-LF-P pin-compatible with earlier MP8042 variants?

Yes - MP8042DF-LF-P shares identical pinout, electrical specifications, and package dimensions with MP8042DF and MP8042DF-Z. The "-LF" suffix denotes lead-free/RoHS-compliant finish; functionality and layout compatibility are fully maintained.

What happens to the outputs during STBY assertion?

When STBY is driven low, both OUT1 and OUT2 enter high-impedance (Hi-Z) state regardless of PWM input state. The internal low-side MOSFETs remain capable of brief conduction to refresh bootstrap capacitors, ensuring rapid resumption of normal operation when STBY is released.