Analog Devices Inc./Maxim Integrated MAX22701EAWA+

Overview

The MAX22701EAWA+ from Analog Devices is a single-channel, single-ended-input isolated gate driver optimized for SiC and GaN power transistors in high-frequency motor drives and PV inverters. It delivers 300kV/μs typical common-mode transient immunity (CMTI), 35ns propagation delay at +25°C, 2ns part-to-part delay matching at room temperature, and features an integrated Miller clamp (CLAMP pin) to suppress false turn-on. Its narrow SOIC-8 package supports 3kVRMS isolation and operates from -40°C to +125°C ambient.

For engineers reviewing the MAX22701EAWA+ datasheet, MAX22701EAWA+ pinout, MAX22701EAWA+ application, or MAX22701EAWA+ equivalent, this page provides verified technical context on its Miller-clamp functionality, B-side supply flexibility (VDDB/VSSB), ultra-fast pulse handling (20ns min pulse width), and isolation compliance (UL1577, cUL, VDE pending) - all critical for SiC/GaN inverter reliability and EMI robustness.

Technical Context

The MAX22701EAWA+ implements unidirectional digital galvanic isolation using Maxim's proprietary process, with side A (logic) referenced to GNDA/VDDA and side B (power) referenced to VSSB/VDDB. Its output stage combines a 4.5Ω high-side pMOS pull-up and a 2.5Ω low-side nMOS pulldown, augmented by a dedicated 2.5Ω Miller clamp transistor (RDSON_CLMP) tied to the CLAMP pin.

It supports single-ended PWM input (IN) with active-low enable (EN), enabling fast forced shutdown of the external transistor. The Miller clamp activates when VGS exceeds 1.7–2.3V (VTH_CLMP), providing a low-impedance path from OUT to VSSB during Miller plateau to prevent dv/dt-induced false turn-on in high-dV/dt SiC/GaN switching environments.

Key Specifications

Pinout & Package

The MAX22701EAWA+ is housed in an 8-pin narrow-body SOIC package (S8MS+23 outline, 4mm creepage/clearance, CTI >600, Group I material) with RoHS-compliant lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si8271AD-IS and UCC5870QDWJRQ1, the MAX22701EAWA+ uniquely integrates a verified Miller clamp with 300kV/μs CMTI in a narrow SOIC footprint - delivering superior SiC-specific noise immunity and reduced external component count in space-constrained industrial inverters.

Availability

The MAX22701EAWA+ is available at Aetrix Electronics and suitable for motor drive inverters, photovoltaic string inverters, uninterruptible power supplies, and industrial AC drives requiring stable component supply across extended product lifecycles.

Supply support for MAX22701EAWA+ 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

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.

The MAX22700–MAX22702 family was designed specifically to address the gate-driving challenges of wide-bandgap power devices - delivering ultra-high CMTI, precise timing matching, and integrated protection features for next-generation SiC and GaN inverters.

FAQ

What is the function of the CLAMP pin on the MAX22701EAWA+?

The CLAMP pin on the MAX22701EAWA+ provides an active Miller clamp that connects directly to the gate of the external SiC or GaN transistor. When the gate-source voltage exceeds 1.7–2.3V (VTH_CLMP), the internal 2.5Ω clamp transistor turns on, creating a low-impedance path from OUT to VSSB. This prevents false turn-on caused by Miller current during high-dv/dt switching transitions - a critical requirement for reliable SiC operation in 800V+ systems. The MAX22701EAWA+ integrates this function internally, eliminating discrete clamp diodes.

Does the MAX22701EAWA+ support both 3.3V and 5V logic inputs?

Yes, the MAX22701EAWA+ supports both 3.3V and 5V logic levels on its IN and EN pins. Input high voltage (VIH) is defined as 0.7 × VDDA, and input low voltage (VIL) as 0.3 × VDDA - meaning VIH = 2.31V min at VDDA = 3.3V and 3.5V min at VDDA = 5V. This rail-to-rail compatibility allows seamless integration with microcontrollers, FPGAs, and DSPs operating at either logic standard without level-shifting circuitry. The MAX22701EAWA+'s input hysteresis (0.1 × VDDA) further enhances noise immunity in electrically noisy inverter environments.

What isolation certifications does the MAX22701EAWA+ hold?

The MAX22701EAWA+ holds UL1577 certification (file E351759) for 3kVRMS withstand voltage for 60 seconds in its narrow SOIC package, and cUL recognition to CSA Bulletin 5A at the same rating. VDE 0884-11 Basic Insulation certification is pending for the wide SOIC variant; however, the MAX22701EAWA+ (narrow SOIC) is fully certified for UL/cUL safety compliance in industrial equipment. Its 600VRMS working voltage (VIOWM) and ±5kV surge capability (1.2/50μs) meet IEC 61000-4-5 Level 4 requirements for harsh industrial environments.

How does the MAX22701EAWA+ handle undervoltage lockout (UVLO)?

The MAX22701EAWA+ implements dual independent UVLO circuits: one on the A-side (VDDA) with thresholds of 2.69V (rising) and 2.59V (falling), and one on the B-side (VDDB relative to VSSB) with thresholds of 13.0V (rising) and 11.6V (falling). Both include 100mV and 1V hysteresis respectively to prevent oscillation during brown-out conditions. When either supply falls below its UVLO threshold, the output (OUT) is actively pulled low - ensuring the external power transistor remains safely off during startup, fault, or supply instability. This behavior is intrinsic to the MAX22701EAWA+ design and requires no external components.

Can the MAX22701EAWA+ drive both SiC MOSFETs and GaN HEMTs effectively?

Yes, the MAX22701EAWA+ is explicitly characterized and optimized for both silicon carbide (SiC) MOSFETs and gallium nitride (GaN) HEMTs. Its 2.5Ω low-side RDSON, 4.5Ω high-side RDSON, 3.6ns rise time, and 2.5ns fall time (CL = 200pF) provide sufficient peak current (1.9–2.85A) and speed for gate charging/discharging in sub-100ns switching transitions. The integrated Miller clamp (VTH_CLMP = 1.7–2.3V) aligns precisely with SiC's turn-on threshold, while its 300kV/μs CMTI rejects the extreme dv/dt (>50V/ns) inherent in GaN hard-switching. Application notes AN-2142 and AN-2157 confirm validated performance with Wolfspeed C3M and Transphorm TPH3205WS GaN devices.