Monolithic Power Systems Inc. MP18871-A4BGLU-P

Overview

MP18871-A4BGLU-P from Monolithic Power Systems is an isolated, PWM-input half-bridge gate driver with 4A peak source/sink current, 50ns typical propagation delay, and configurable dead time via external resistor. It integrates high-side and low-side drivers with independent secondary-side grounds, supports 2.8–5.5V primary VDDI and up to 30V secondary supply, and targets isolated DC/DC converters requiring robust CMTI >100kV/µs.

For engineers reviewing the MP18871-A4BGLU-P datasheet, MP18871-A4BGLU-P pinout, MP18871-A4BGLU-P application, or MP18871-A4BGLU-P equivalent, this device delivers verified functional isolation (700VDC between secondary drivers), UL 1577 and VDE 0884-17 certification for LGA-13 package, and precise overlap protection for half-bridge power stages in offline AC/DC and motor drive systems.

Technical Context

The MP18871-A4BGLU-P implements capacitive-based galvanic isolation between input and output sides, enabling reinforced insulation (2.5kVRMS withstand) in its LGA-13 package. Its dual-channel architecture allows independent grounding of VSSA and VSSB, supporting asymmetric topologies including high-side/low-side half-bridge configurations driven by a single PWM signal.

Dead time is set externally via resistor on DT pin (2–150kΩ range), yielding 10–1100ns adjustment with ±10ns matching. UVLO thresholds are fixed at 3V (A-grade) on secondary supplies (VDDA/VDDB), with hysteresis of 200–400mV, ensuring reliable turn-on under varying bus conditions in isolated flyback or LLC resonant converters.

Key Specifications

Pinout & Package

LGA-13 (5mm × 5mm) package with exposed thermal pad; RoHS-compliant, halogen-free, MSL Level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si8239x-B-IS and ADuM4223BRIZ, MP18871-A4BGLU-P uniquely combines LGA-13 compactness, 700V functional isolation between channels, resistor-configurable dead time, and 3.2V secondary UVLO - making it optimal for space-constrained, high-reliability isolated half-bridge systems where rail margin and shoot-through risk must be actively managed.

Availability

MP18871-A4BGLU-P is available at Aetrix Electronics and suitable for isolated DC/DC converters, offline AC/DC adapters, and industrial motor drives requiring stable component supply, long-term lifecycle support, and certified safety isolation.

Supply support for MP18871-A4BGLU-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 power management ICs, with design centers in the US, China, and Taiwan.

The MP18871 product line delivers isolated gate drivers optimized for high-efficiency, high-density power conversion in industrial, telecom, and renewable energy systems - emphasizing integration, safety certification, and robust transient immunity.

FAQ

What is the exact isolation rating for MP18871-A4BGLU-P?

The MP18871-A4BGLU-P has a 2.5kVRMS dielectric withstand voltage per UL 1577 for 60 seconds and 3535VPK per DIN EN IEC 60747-17 (VDE 0884-17), both certified for the LGA-13 package. Functional isolation between VSSA and VSSB is rated at 700VDC.

Does MP18871-A4BGLU-P require external components for basic operation?

Yes: a 2.8–5.5V VDDI supply with local 100nF ceramic decoupling to GNDI, separate 4.2–30V VDDA/VDDB supplies each with local 100nF decoupling to respective VSSA/VSSB, and a resistor (2–150kΩ) from DT to GNDI to set dead time. No external bootstrap diodes or level shifters are needed.

How does the DIS pin differ from EN in MP18871-A4BGLU-P?

DIS is active-high with internal pull-down; driving DIS high disables outputs. EN is active-high with internal pull-up; pulling EN low disables outputs. Both provide redundant shutdown paths. The part number suffix "A4B" indicates DIS-enabled logic (EN unused or tied high), matching the -A4B variant's default enable-by-DIS behavior.

Can MP18871-A4BGLU-P drive GaN HEMTs directly?

Yes: its 4A peak source/sink current, 50ns propagation delay, and 10–20ns rise/fall times (with 1.8nF load) meet gate drive requirements for 650V GaN devices. Ensure VDDA/VDDB ≥12V and use low-inductance layout to preserve switching speed and minimize ringing.

What is the thermal pad soldering requirement for LGA-13?

The exposed thermal pad must be soldered to a dedicated PCB copper pour using standard reflow profile (peak 260°C). A 0.15mm stencil aperture with 50% area ratio is recommended. Thermal resistance drops from 106°C/W (θJA) to ≤45°C/W with proper pad connection and 2oz copper planes.

Is there a minimum dead time when DT pin is left open?

Yes: leaving DT open yields a minimum dead time of 10–30ns (typical 20ns), verified across temperature and process corners. This value is sufficient for most 650V Si MOSFETs but may require external adjustment for ultra-fast SiC or GaN devices needing >100ns dead time.

Does MP18871-A4BGLU-P support bidirectional communication or feedback signals?

No: it is a unidirectional PWM-input gate driver only. There is no built-in fault reporting, current sensing, or status feedback path. Fault detection must be implemented externally via DESAT pins on power devices or auxiliary comparators.