Monolithic Power Systems Inc. MP18831-A4CGSE-Z

Overview

MP18831-A4CGSE-Z from Monolithic Power Systems is an isolated dual-input high-side/low-side half-bridge gate driver with 4A peak source/sink current, 50ns typical propagation delay, and configurable dead time via external resistor. It uses capacitive isolation to deliver 5kVRMS input-to-output withstand voltage (SOIC-16 WB), >100kV/µs CMTI, and supports 2.8–5.5V primary-side logic interfacing for SiC/GaN MOSFET control in isolated DC/DC converters.

For engineers reviewing the MP18831-A4CGSE-Z datasheet, MP18831-A4CGSE-Z pinout, MP18831-A4CGSE-Z application, or MP18831-A4CGSE-Z equivalent, this device is selected for high-efficiency, high-CMTI, isolated half-bridge drive where shoot-through prevention, UVLO flexibility (3V option), and dual independent input control are critical in industrial and telecom power systems.

Technical Context

The MP18831 integrates two independently controlled, isolated gate drivers sharing a single capacitive isolation barrier. Its dual-input architecture accepts separate INA/INB signals for high-side and low-side channels, enabling asymmetric timing and precise dead-time configuration via the DT pin.

It implements overlap protection through internal logic that enforces minimum off-time between complementary outputs, while its dual UVLO thresholds (3V on VDDA/VDDB) ensure robust turn-on only when secondary-side supplies meet minimum rail requirements-critical for reliability in offline AC/DC and isolated DC/DC topologies.

Key Specifications

Pinout & Package

MP18831-A4CGSE-Z is supplied in SOIC-16 wide-body (WB) package, providing 5kVRMS isolation and 8mm creepage/clearance. Pin functions are validated per MPS MP18831 Rev. 1.0 datasheet (pp. 6–7).

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si823Hx and UCC5390SCD, MP18831-A4CGSE-Z uniquely combines dual independent inputs, resistor-configurable dead time, and multi-threshold UVLO - making it optimal for adaptive, high-reliability isolated bridge control where timing precision and supply margining are design-critical.

Availability

MP18831-A4CGSE-Z is available at Aetrix Electronics and suitable for isolated DC/DC converters, offline AC/DC power supplies, and motor drive inverters requiring stable component supply, long-term lifecycle support, and certified safety isolation.

Supply support for MP18831-A4CGSE-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 power management ICs, with core expertise in DC/DC conversion, gate driving, and isolation technologies.

The MP18831 product line delivers isolated half-bridge gate drivers optimized for high-efficiency, high-density power conversion in telecom, industrial, and renewable energy systems - emphasizing robust CMTI, flexible UVLO, and shoot-through immunity.

FAQ

What is the function of the DT pin on MP18831-A4CGSE-Z?

The DT pin configures dead time between high-side and low-side outputs using an external resistor to GNDI. Values from 2kΩ to 150kΩ set dead time from 10ns to 1100ns. A 220pF capacitor in parallel improves noise immunity. Leaving DT open yields minimum 10ns dead time - critical for preventing shoot-through in half-bridge topologies.

Does MP18831-A4CGSE-Z support both enable (EN) and disable (DIS) logic?

Yes - MP18831-A4CGSE-Z provides dual control inputs: EN (active-high, internally pulled high) and DIS (active-high, internally pulled low). Either can be used independently to enable/disable both gate outputs. EN = low or DIS = high disables the driver; both default to enabled if left unconnected.

What isolation certifications does MP18831-A4CGSE-Z hold?

MP18831-A4CGSE-Z (SOIC-16 WB variant) is UL 1577 certified for 5kVRMS isolation (60s), DIN EN IEC 60747-17 (VDE 0884-17):2021-10 certified for 6000VPK, and CQC-certified per GB 4943.1-2011. It achieves reinforced insulation with 8mm creepage/clearance and 20μm internal barrier thickness.

Can MP18831-A4CGSE-Z drive both SiC and GaN FETs?

Yes - its 4A peak source/sink current, 50ns propagation delay, and <20ns rise/fall times (with 1.8nF load) support fast-switching SiC and GaN devices. The 30V maximum VDDA/VDDB allows direct drive of enhancement-mode GaN FETs and level-shifted SiC gate drivers without external buffers.

How does the UVLO setting differ between MP18831-A4CGSE-Z and other MP18831 variants?

MP18831-A4CGSE-Z uses the "-A" suffix, indicating a 3V UVLO threshold on VDDA/VDDB (min 2.7V, typ 3.2V, max 3.7V). Other variants use -B (5V), -C (8V), -D (10V), or -E (12V) thresholds - allowing selection based on secondary-side supply stability and FET gate threshold margins.

What is the thermal performance difference between SOIC-16 WB and LGA-13 packages?

SOIC-16 WB offers θJA = 56°C/W and 2215mW max power dissipation at 25°C ambient; LGA-13 has θJA = 106°C/W and 1175mW. The WB package delivers ~2× higher thermal capability - essential for high-duty-cycle, high-frequency operation in compact power modules where heatsinking is limited.