Analog Devices Inc. ADP3623ARDZ-RL

Overview

ADP3623ARDZ-RL from Analog Devices is a high-speed, dual-channel, 4 A low-side MOSFET driver with thermal protection, designed for driving two independent N-channel power MOSFETs in switching power supplies. It operates from 4.5 V to 18 V, delivers 10 ns typical rise/fall times at 2.2 nF load, and features matched propagation delays (≤2 ns), overtemperature warning (120°C–150°C), and shutdown (150°C–180°C) thresholds.

For engineers reviewing the ADP3623ARDZ-RL datasheet, ADP3623ARDZ-RL pinout, ADP3623ARDZ-RL application, or ADP3623ARDZ-RL equivalent, key selection criteria include its 4.5 V UVLO threshold, SOIC_N_EP thermally enhanced package, dual inverting-input configuration, and integrated OTW open-drain flag for system-level thermal monitoring in high-frequency DC/DC converters.

Technical Context

The ADP3623ARDZ-RL implements dual inverting gate drivers with independent inputs (INA, INB) and outputs (OUTA, OUTB), each capable of sourcing/sinking ±4 A peak current. Its internal temperature sensor enables two-tier thermal protection: an active-low OTW flag at 120°C–150°C and automatic shutdown above 150°C–180°C.

It features a precision SD input comparator with 240–320 mV hysteresis and 1.19–1.38 V high threshold, supporting redundant overvoltage protection. The device uses a 3.3 V-compatible logic interface, UVLO with 0.3 V hysteresis (4.2 V turn-on), and supports parallel operation by tying INA/INB and OUTA/OUTB for increased drive strength.

Key Specifications

Pinout & Package

ADP3623ARDZ-RL is housed in an 8-lead SOIC_N_EP (RD-8-4) package with exposed thermal pad, optimized for PCB heat dissipation (θ_JA = 59°C/W on JEDEC 4-layer board).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual low-side MOSFET driver applications.

Compared with LM5113MRX/NOPB and UCC27211D, ADP3623ARDZ-RL uniquely combines inverting inputs, integrated OTW signaling, and thermally enhanced SOIC_N_EP packaging - making it optimal for space-constrained, thermally demanding synchronous rectifiers and multiphase VRMs where early thermal intervention is critical.

Availability

ADP3623ARDZ-RL is available at Aetrix Electronics and suitable for AC/DC switch mode power supplies, high-frequency DC/DC converters, and synchronous rectification systems requiring stable component supply, RoHS-compliant sourcing, and long-term production continuity.

Supply support for ADP3623ARDZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.

The ADP362x family was engineered specifically for high-efficiency, high-frequency power conversion systems - emphasizing thermal resilience, precise timing, and seamless integration with digital PWM controllers.

FAQ

What is the UVLO threshold of ADP3623ARDZ-RL and why does it matter?

The ADP3623ARDZ-RL has a UVLO turn-on threshold of 4.2 V typical (3.8 V min, 4.5 V max) with 0.3 V hysteresis. This ensures the driver remains disabled until the VDD rail is sufficiently stable to support reliable gate drive, preventing partial turn-on of power MOSFETs that could cause shoot-through or excessive conduction loss. The low 4.5 V range also allows compatibility with 5 V and 3.3 V controller supply domains when used with appropriate level-shifting or regulator staging.

How does the OTW pin function in ADP3623ARDZ-RL and what external circuitry is needed?

The OTW pin on ADP3623ARDZ-RL is an open-drain, active-low overtemperature warning output. It pulls low when the junction temperature exceeds 120°C–150°C and releases high otherwise. An external pull-up resistor (typically 4.7 kΩ to 3.3 V or 5 V) is required to establish a valid logic high state. Multiple ADP3623ARDZ-RL devices can share a single OTW bus via wire-OR connection, allowing centralized thermal monitoring in multi-phase or multi-rail power systems.

Can ADP3623ARDZ-RL drive both high-side and low-side N-MOSFETs?

No - ADP3623ARDZ-RL is a dedicated low-side driver only. Its outputs (OUTA, OUTB) are referenced to PGND and cannot float above VDD. To drive high-side N-MOSFETs, a separate high-side driver (e.g., ADP3654) or bootstrap-based gate driver IC is required. The ADP3623ARDZ-RL's design assumes ground-referenced loads, such as synchronous rectifiers or bottom switches in half-bridge configurations.

What is the purpose of the SD pin on ADP3623ARDZ-RL and how should it be interfaced?

The SD (Shutdown) pin on ADP3623ARDZ-RL is an active-high input that forces both OUTA and OUTB low when asserted. It features an internal pull-up, so the pin must be pulled low (e.g., via MCU GPIO or resistor divider) for normal operation. Its precision comparator (1.28 V threshold, 280 mV hysteresis) accepts slow-changing analog signals - enabling direct connection to scaled-down bus voltages for redundant overvoltage protection without external components.

Is ADP3623ARDZ-RL pin-compatible with other members of the ADP362x/ADP363x family?

Yes - ADP3623ARDZ-RL shares identical pinout and package (SOIC_N_EP) with ADP3624ARDZ, ADP3625ARDZ-RL, ADP3633ARDZ-RL, and all other ADP362x/ADP363x variants. However, functional differences exist: ADP3623ARDZ-RL uses inverting inputs (INA, INB) and 4.5 V UVLO, whereas ADP3624 uses non-inverting inputs and same UVLO, and ADP3633 uses 9.5 V UVLO. Swapping requires verifying input logic polarity and supply voltage compatibility.