Monolithic Power Systems Inc. MP8049SDU-LF-Z

Overview

MP8049SDU-LF-Z from Monolithic Power Systems is a quad-channel power half-bridge 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-enabling 37W/channel BTL output at 24V/8Ω in flat TV and home theater systems.

For engineers reviewing the MP8049SDU-LF-Z datasheet, MP8049SDU-LF-Z pinout, MP8049SDU-LF-Z application, or MP8049SDU-LF-Z equivalent, key selection criteria include its quad half-bridge topology, integrated fault flag (FAULTB), bootstrap-supplied high-side gate drive, thermal shutdown at 160°C, and QFN40 (5×5mm) package with exposed thermal pad.

Technical Context

The MP8049SDU-LF-Z implements four independent half-bridge stages, each with matched high- and low-side MOSFETs driven by PWM inputs (PWM1A/B, PWM2A/B) and controlled via SHDNB (global shutdown) and STBYB (high-impedance standby). Its internal regulator generates VDR1/VDR2 from VSP1/VSP2 to power gate drivers and logic, while BST1A/B/2A/B pins supply bootstrapped high-side gate voltage.

Fault protection includes per-channel current limiting (5.5A), thermal shutdown (160°C trip, 35°C hysteresis), input under-voltage lockout (4.4–4.8V rising threshold), and open-drain FAULTB/FLT2B/FLT3B outputs with Boolean-coded fault reporting. All switches feature 10ns dead time and 5ns rise/fall times for clean commutation.

Key Specifications

Pinout & Package

MP8049SDU-LF-Z is housed in a thermally enhanced 40-pin QFN package (5mm × 5mm, 0.5mm pitch) with an exposed thermal pad on the bottom for PCB-level heat dissipation. The package complies with JEDEC MO-220 VHHE-1 and supports reflow soldering per IPC/JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TAS5381A and IRS2092S, MP8049SDU-LF-Z uniquely combines quad half-bridge flexibility, Boolean fault encoding, and bootstrap auto-refresh in a single QFN40 package-reducing BOM count and simplifying thermal management in space-constrained audio systems.

Availability

MP8049SDU-LF-Z is available at Aetrix Electronics and suitable for flat panel TV audio, home theater receivers, DVD/Blu-ray player amplifiers, and soundbar integrated amplifiers requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MP8049SDU-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 design centers in the US, China, and Taiwan, and manufacturing partners across Asia.

The MP8049S product line targets high-efficiency, low-noise Class-D audio power stages for consumer electronics, emphasizing integration of gate drive, protection, and diagnostics in thermally optimized packages.

FAQ

What is the minimum recommended bootstrap capacitor value for MP8049SDU-LF-Z?

A minimum 0.1µF ceramic capacitor rated for ≥16V must be placed between each BST pin (BST1A, BST1B, BST2A, BST2B) and its corresponding SW pin. Larger values (e.g., 0.22µF) improve stability under high-duty-cycle or low-frequency PWM conditions and reduce voltage droop during sustained conduction.

How does the MP8049SDU-LF-Z handle thermal overload?

When junction temperature exceeds 160°C, all four MOSFETs in the affected full-bridge channel shut off immediately. Operation resumes only after die temperature falls below 125°C (35°C hysteresis), preventing thermal runaway while allowing recovery without system reset.

Can MP8049SDU-LF-Z operate with a single 12V supply across both VSP1 and VSP2?

Yes-VSP1 and VSP2 may be tied together to a common 5–26V rail. However, separate routing is recommended for improved noise isolation and fault containment; the IC does not require independent supplies unless system architecture demands it.

What logic levels are compatible with PWM1A/B and PWM2A/B inputs?

PWM inputs accept standard 3.3V or 5V CMOS logic: low threshold is 0.8–1.0V, high threshold is 1.6–1.8V. Input bias current is ≤1.0µA, enabling direct interface with microcontrollers, DSPs, and FPGA GPIO without level-shifting.

Is the FAULTB pin actively driven or open-drain?

FAULTB is an open-drain, active-low output. An external pull-up resistor (typically 10kΩ to VDD or microcontroller I/O rail) is required. It asserts low for any fault condition-OCP, OTP, or UVP-and releases high when all faults clear.

Does MP8049SDU-LF-Z support parallel operation of multiple channels?

No-channels are electrically independent and not designed for paralleling. Each half-bridge must drive its own load. Paralleling SW outputs risks unequal current sharing and violates absolute maximum ratings due to mismatched propagation delays and R_DS(on).

What is the purpose of the FLT2B and FLT3B pins?

FLT2B and FLT3B are auxiliary open-drain fault outputs that encode fault type (OCP, OTP, UVP) in Boolean logic per Table 1 in the datasheet. They allow host controllers to distinguish fault causes without polling or additional sensors-critical for automated diagnostics and graceful degradation.