Analog Devices Inc. ADUM4221-1CRIZ-RL

Overview

ADUM4221-1CRIZ-RL from Analog Devices is an isolated half-bridge gate driver with adjustable dead time, 4 A peak output current, 44 ns max propagation delay, and 5700 V_rms reinforced isolation. It accepts 2.5–6.5 V logic inputs and drives IGBTs/MOSFETs with independent 4.5–35 V output supplies, targeting high-reliability switching power supplies and SiC/GaN inverters.

For engineers reviewing the ADUM4221-1CRIZ-RL datasheet, ADUM4221-1CRIZ-RL pinout, ADUM4221-1CRIZ-RL application, or ADUM4221-1CRIZ-RL equivalent, this page delivers verified specifications, SOIC_IC package mapping, functional pin definitions, UVLO grade C thresholds (11.6 V), thermal shutdown behavior, and real-world dead time tuning via external resistor - all confirmed for the -1 variant.

Technical Context

The ADUM4221-1CRIZ-RL implements iCoupler® monolithic transformer isolation between input and dual output channels, enabling galvanic separation of control logic (VDD1/GND1) from high-side (VDDA/GNDA/VOA) and low-side (VDDB/GNDB/VOB) gate drive domains. Its single-PWM-input architecture integrates overlap protection and adjustable dead time via the DT pin.

It features dual UVLO monitoring: VDD1 positive-going threshold ≤2.5 V and VDDA/VDDB positive-going threshold at Grade C (11.6 V), plus internal thermal shutdown (TSD) activating at 155°C with 30°C hysteresis. CMOS-compatible inputs support direct interfacing with microcontrollers and PWM controllers without level shifting.

Key Specifications

Pinout & Package

ADUM4221-1CRIZ-RL uses a 16-lead SOIC_IC package with increased creepage (8.3 mm) and wide-body footprint for reinforced isolation. Pin 1 is PWM input; pins 3 and 8 are tied VDD1; pin 5 is DISABLE; pin 6 is DT; pins 10 and 15 are VOB and VOA outputs; pins 11 and 16 are VDDB and VDDA supplies; pins 4, 9, and 14 serve as GND1, GNDB, and GNDA references.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Si8273BD-IS and ISO5852S, ADUM4221-1CRIZ-RL uniquely combines Grade C UVLO, 4 A drive, and resistor-tunable dead time - making it optimal for high-reliability, high-frequency SiC/GaN systems requiring field-programmable timing margins and reinforced isolation.

Availability

ADUM4221-1CRIZ-RL is available at Aetrix Electronics and suitable for industrial motor drives, solar microinverters, server PSUs, and EV onboard chargers requiring stable component supply, long-term lifecycle assurance, and reinforced isolation compliance.

Supply support for ADUM4221-1CRIZ-RL 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.

The ADUM4221 family belongs to Analog Devices' iCoupler® isolated gate driver product line, designed specifically for high-reliability, high-speed power conversion systems using SiC and GaN transistors.

FAQ

What is the function of the DT pin on the ADUM4221-1CRIZ-RL?

The DT pin on the ADUM4221-1CRIZ-RL sets the dead time between high-side and low-side output transitions using an external resistor to GND1. With a 10 kΩ–500 kΩ resistor, dead time ranges from 48 ns to 2831 ns. This feature prevents shoot-through in half-bridge configurations and is unique to the ADUM4221 and ADUM4221-1 variants - the ADUM4221-2 lacks this pin. The ADUM4221-1CRIZ-RL's DT functionality is fully specified in its truth table and timing diagrams.

Does ADUM4221-1CRIZ-RL support both bootstrap and isolated supply topologies?

Yes, ADUM4221-1CRIZ-RL supports both topologies. Its independent VDDA and VDDB supplies (4.5–35 V each) allow direct connection to isolated DC/DC outputs or bootstrap capacitors. GNDA and GNDB are separately referenced, enabling floating high-side operation without level-shifting circuitry. The ADUM4221-1CRIZ-RL datasheet explicitly confirms compatibility with bootstrapped half-bridge operation in Section "Bootstrapped, Half Bridge Operation" (Page 20).

What UVLO grade does ADUM4221-1CRIZ-RL implement on its output supplies?

ADUM4221-1CRIZ-RL implements Grade C UVLO on VDDA and VDDB, with a positive-going threshold of 11.6 V and hysteresis of 0.2 V. This is confirmed in Table 1 (Electrical Characteristics) and Section "Multiple UVLO options" of the datasheet. Grade C is selected for higher bus voltage applications such as 12 V auxiliary rails or 24 V industrial systems where tighter undervoltage margining is required to avoid erratic switching during transients.

How does the thermal shutdown (TSD) mechanism work in ADUM4221-1CRIZ-RL?

ADUM4221-1CRIZ-RL activates thermal shutdown at 155°C junction temperature, forcing both VOA and VOB outputs low. It includes 30°C hysteresis, so outputs remain low until junction temperature falls below 125°C. This behavior is documented in Table 1 (TSD Positive Edge and Hysteresis) and the General Description section. The ADUM4221-1CRIZ-RL TSD protects downstream FETs from thermal runaway during overload or insufficient heatsinking.

Is ADUM4221-1CRIZ-RL pin-compatible with ADUM4221 or ADUM4221-2?

No, ADUM4221-1CRIZ-RL is not pin-compatible with ADUM4221 or ADUM4221-2. While all three share the same 16-lead SOIC_IC package and pin 1–4, 8–16 assignments, pin 2 differs: ADUM4221 uses VIB, ADUM4221-1 uses NC, and ADUM4221-2 uses VIB. Also, pin 6 is DT on ADUM4221/ADUM4221-1 but NC on ADUM4221-2. These differences mean PCB layout must be variant-specific - the ADUM4221-1CRIZ-RL requires dedicated routing for PWM (pin 1) and DT (pin 6).