Analog Devices Inc. ADP3624ARDZ

Overview

ADP3624ARDZ from Analog Devices is a high-speed, dual-channel, 4 A low-side MOSFET driver IC designed for driving two independent N-channel power MOSFETs in switching power stages. It operates from 4.5 V to 18 V, delivers 10 ns typical rise/fall times at 2.2 nF load, features matched propagation delays (<2 ns), and includes overtemperature warning (OTW) and shutdown protection. It is used in synchronous rectification circuits where fast, robust gate drive and thermal safety are critical.

For engineers reviewing the ADP3624ARDZ datasheet, ADP3624ARDZ pinout, ADP3624ARDZ application, or ADP3624ARDZ equivalent, key selection considerations include its 4.5–18 V supply range, 3.3 V-compatible logic inputs, SOIC_N_EP thermally enhanced package, and dual-channel parallel operation capability for increased current drive.

Technical Context

The ADP3624ARDZ implements noninverting input logic for both channels (INA/INB), enabling direct interface with PWM controllers without external inversion. Its internal temperature sensor provides two-tier thermal protection: an open-drain OTW flag active below 120–150°C and automatic shutdown above 150–180°C.

It integrates UVLO with 0.3 V hysteresis (turn-on at 4.2 V, turn-off at 3.9 V), precise SD shutdown comparator (1.28 V threshold ±0.07 V), and internal pull-downs on all inputs to ensure fail-safe off-state. The output stage delivers ±4 A peak source/sink current into capacitive loads while maintaining matched channel delays and sub-35 ns propagation times.

Key Specifications

Pinout & Package

ADP3624ARDZ is housed in an 8-lead SOIC_N_EP (narrow-body SOIC with exposed pad), offering low thermal resistance (θJA = 59°C/W per JEDEC 4-layer board) and improved power dissipation versus standard SOIC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5113SD/NOPB and UCC27524D, ADP3624ARDZ uniquely integrates overtemperature warning and shutdown in a thermally enhanced SOIC_N_EP package, delivering superior reliability in compact, high-power-density designs without requiring additional thermal sensors or protection circuitry.

Availability

ADP3624ARDZ is available at Aetrix Electronics and suitable for AC-DC switch mode power supplies, DC-DC power supplies, and synchronous rectification systems requiring stable component supply, RoHS-compliant packaging, and long-term industrial lifecycle support.

Supply support for ADP3624ARDZ 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 power controllers.

FAQ

What is the recommended PCB layout practice for ADP3624ARDZ to ensure optimal thermal performance?

Place the ADP3624ARDZ's exposed pad directly soldered to a large copper pour connected to PGND via multiple thermal vias. Route VDD and PGND traces wide (>40 mil) and short, position the 4.7 µF bypass capacitor within 2 mm of VDD/PGND pins, and connect PGND pin directly to MOSFET source pads to minimize ground loop inductance. This layout reduces θJA and maintains junction temperature below 150°C under full load.

Can ADP3624ARDZ drive both high-side and low-side N-channel MOSFETs in a half-bridge configuration?

ADP3624ARDZ is a dedicated low-side driver and cannot directly drive high-side N-MOSFETs due to lack of floating high-voltage level-shifting capability. It can drive the low-side switch in a half-bridge; for high-side drive, pair it with a bootstrap-based high-side driver (e.g., ADP3623) or isolated gate driver. Its noninverting inputs simplify control logic when used with complementary PWM signals.

How does the SD pin function in ADP3624ARDZ, and what voltage levels trigger shutdown?

The SD pin on ADP3624ARDZ is an active-high shutdown input with a precision internal comparator. Shutdown activates when SD voltage exceeds 1.28 V (typical), with hysteresis of 280 mV. An internal pull-up holds SD high by default, so external circuitry must actively pull SD low (e.g., via MCU GPIO or resistor divider) to enable normal operation. This allows reliable OVP/OCP fault response without external comparators.

Is ADP3624ARDZ pin-compatible with other members of the ADP362x/ADP363x family?

Yes - ADP3624ARDZ shares identical pinout and package (SOIC_N_EP) with ADP3623ARDZ, ADP3625ARDZ, ADP3634ARDZ, and all ARDZ variants in the family. However, UVLO thresholds differ: ADP3624ARDZ uses 4.5 V UVLO, while ADP3634ARDZ uses 9.5 V. Swapping them without verifying supply compatibility may cause startup failure or unintended shutdown.

What is the maximum gate capacitance ADP3624ARDZ can drive while maintaining specified rise/fall times?

ADP3624ARDZ is characterized for 10 ns rise/fall times with a 2.2 nF capacitive load. While it can drive larger loads (e.g., 5–10 nF), rise/fall times scale approximately linearly with capacitance - e.g., ~23 ns at 5 nF. For >3 nF loads, add series gate resistors to dampen ringing and verify timing margins in final layout using the device's ±4 A peak current capability.