Monolithic Power Systems Inc. MP8049SDU-LF-P

Overview

MP8049SDU-LF-P from Monolithic Power Systems is a quad-channel half-bridge power driver IC designed as the output stage for Class-D audio amplifiers, configurable as dual full-bridge or quad half-bridge. It delivers ±5.5A peak current per channel, supports 5V–26V VDD, operates up to 1MHz switching frequency, and integrates 0.14Ω protected MOSFETs with 10ns dead time. Used in flat-panel TV audio subsystems driving 8Ω BTL loads at 24V.

For engineers reviewing the MP8049SDU-LF-P datasheet, MP8049SDU-LF-P pinout, MP8049SDU-LF-P application, or MP8049SDU-LF-P equivalent, key selection factors include its quad half-bridge topology, integrated fault flag (FAULTB), thermal shutdown at 160°C, and QFN40 (5×5mm) package with exposed thermal pad for high-power audio output stages.

Technical Context

The MP8049SDU-LF-P implements four independent half-bridge drivers with bootstrap-gated high-side MOSFETs and integrated low-side switches. Each channel features matched 0.14Ω R_DS(on) and symmetrical 10ns dead-time control to prevent shoot-through under varying load conditions.

It embeds dual UVLO circuits (VSP threshold 3.7–4.8V, BST UVLO falling at 2.2V), open-drain FAULTB/FLT2B/FLT3B outputs for OCP/OTP/UVP reporting, and STBYB-controlled high-impedance output state-enabling precise system-level power sequencing and fault recovery in multi-channel audio systems.

Key Specifications

Pinout & Package

MP8049SDU-LF-P uses a thermally enhanced 40-pin QFN package (5mm × 5mm, 0.5mm pitch) with an exposed thermal pad on the bottom side for PCB-level heat dissipation. Pin numbering follows standard JEDEC MO-220 VHHE-1 outline.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TAS5381LA and IRS2092S, MP8049SDU-LF-P uniquely combines quad half-bridge configurability, integrated 0.14Ω MOSFETs, three-fault reporting, and QFN40 thermal performance-reducing component count by 6+ devices and enabling single-layer audio subsystem integration.

Availability

MP8049SDU-LF-P is available at Aetrix Electronics and suitable for flat panel TV audio subsystems, home theater receiver power stages, and soundbar amplifier modules requiring stable component supply, RoHS-compliant packaging, and long-term industrial availability.

Supply support for MP8049SDU-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 mixed-signal ICs for power management, motor control, and audio applications-with over 20 years of expertise in high-efficiency DC/DC conversion and Class-D audio drivers.

The MP8049S product line targets high-density, thermally constrained audio systems requiring integrated, protected, and configurable power stages-designed specifically for flat TV, soundbar, and multi-zone AV equipment where board space and thermal headroom are critical.

FAQ

What is the maximum continuous output power per channel in BTL configuration?

At 24V supply and 8Ω load, MP8049SDU-LF-P delivers 37W per channel in BTL mode with THD+N <1% at 1kHz. This is validated under typical operating conditions (T_A = +25°C) using the recommended LC filter and thermal layout per MPS AN-107.

How does the FAULTB pin behave during overcurrent events?

FAULTB is an open-drain, active-low output that pulls low within 30µs of overcurrent detection on any channel. It remains low until the fault condition clears and internal recovery completes-no external reset is required. Voltage must not exceed 6V on this pin.

Can MP8049SDU-LF-P be used in single-ended (SE) mode?

Yes-each half-bridge channel can operate in SE mode by grounding one output (e.g., SW1B) and driving the other (SW1A) with PWM. The datasheet specifies ±5.5A peak current capability and 0.14Ω R_DS(on) applies equally in SE and BTL configurations.

What is the purpose of the STBYB pin versus SHDNB?

SHDNB fully disables the IC (30µA shutdown current), while STBYB places all outputs in high-impedance state but maintains internal bias, fault monitoring, and PWM input responsiveness-enabling fast mute/unmute without full power-cycle delays.

Is external bootstrap diode required for BST pins?

No-MP8049SDU-LF-P integrates internal bootstrap diodes. A ≥0.1µF ceramic capacitor must be placed between each BST pin (e.g., BST1A) and its corresponding SW pin (e.g., SW1A); no external diode is needed or recommended.

What thermal resistance values apply to the QFN40 package?

The MP8049SDU-LF-P QFN40 package has θ_JA = 36°C/W and θ_JC = 8°C/W when mounted on a 4-layer JEDEC-standard PCB per JESD51-7. These values assume full soldering of the exposed thermal pad to a solid ground plane.

Does the device support PWM frequencies above 500kHz?

Yes-the datasheet specifies operation up to 1MHz switching frequency with stable 10ns dead time. Performance metrics (efficiency, THD+N, SNR) are characterized at 1kHz audio signal with 50% duty-cycle PWM, but the gate driver supports arbitrary PWM waveforms up to 1MHz.