Analog Devices Inc. ADP3634ARDZ-R7

Overview

ADP3634ARDZ-R7 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 9.5 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 (120°C–150°C) and shutdown (150°C–180°C) functions.

For engineers reviewing the ADP3634ARDZ-R7 datasheet, ADP3634ARDZ-R7 pinout, ADP3634ARDZ-R7 application, or ADP3634ARDZ-R7 equivalent, key selection considerations include its 9.5 V UVLO threshold, noninverting input configuration (INA/INB), open-drain OTW flag, SOIC_N_EP thermally enhanced package, and parallel operation capability for increased drive strength.

Technical Context

The ADP3634ARDZ-R7 implements dual noninverting low-side gate drivers with independent inputs (INA, INB) and outputs (OUTA, OUTB), each capable of ±4 A peak current. Its internal temperature sensor enables two-tier thermal protection: an active-low open-drain OTW signal triggers at 120°C–150°C, while hard shutdown activates at 150°C–180°C with 30°C hysteresis.

It features a precision shutdown comparator (SD) with 1.21 V–1.35 V threshold and 240–320 mV hysteresis, enabling redundant overvoltage or overcurrent fault response. Input logic is 3.3 V-compatible with VIH ≥ 2.0 V and VIL ≤ 0.8 V, and internal pull-downs ensure safe default-off behavior when inputs float.

Key Specifications

Pinout & Package

ADP3634ARDZ-R7 is housed in an 8-lead SOIC_N_EP (RD-8-4) package with exposed thermal pad, optimized for PCB heat dissipation (θJA = 59°C/W on JEDEC 4-layer board). The pinout follows industry-standard dual-driver layout with dedicated ground (PGND) and thermal flag (OTW).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADP3624ARDZ-RL and LM5113SDX/NOPB, the ADP3634ARDZ-R7 offers superior thermal visibility via OTW, tighter channel matching, and higher minimum supply voltage-making it optimal for robust, high-efficiency 12 V-biased power stages where reliability and timing precision are critical.

Availability

ADP3634ARDZ-R7 is available at Aetrix Electronics and suitable for AC-to-DC switch mode power supplies, DC-to-dc power supplies, and motor drives requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ADP3634ARDZ-R7 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 ADP36xx family was developed specifically for high-frequency, high-reliability power conversion systems-emphasizing fast switching, integrated thermal safety, and compatibility with digital controllers in server, telecom, and industrial power applications.

FAQ

What is the UVLO threshold of the ADP3634ARDZ-R7 and why does it matter?

The ADP3634ARDZ-R7 has a UVLO turn-on threshold of 8.0 V to 9.5 V (typical 8.7 V) and turn-off threshold of 7.0 V to 8.5 V (typical 7.7 V), with 1.0 V hysteresis. This ensures reliable startup only after the 12 V bias rail stabilizes, preventing erratic gate drive during power-up or brownout events-critical for avoiding shoot-through in half-bridge configurations. The ADP3634ARDZ-R7's UVLO is fixed and cannot be adjusted externally.

Can the ADP3634ARDZ-R7 drive high-side N-channel MOSFETs directly?

No, the ADP3634ARDZ-R7 is a dedicated low-side driver with outputs referenced to PGND. It lacks a high-side floating supply or level-shifting circuitry required for driving high-side N-MOSFETs. To use it in high-side applications, it must be paired with an external bootstrap circuit or isolated gate driver stage. The ADP3634ARDZ-R7's architecture assumes ground-referenced loads only.

How does the OTW (Overtemperature Warning) pin function in the ADP3634ARDZ-R7?

The OTW pin on the ADP3634ARDZ-R7 is an open-drain, active-low output that asserts when die temperature reaches 120°C–150°C. It remains low until temperature falls below the hysteresis threshold (~140°C). Multiple ADP3634ARDZ-R7 devices can share a single OTW bus via wire-OR connection, allowing centralized thermal monitoring without additional logic. The ADP3634ARDZ-R7 does not auto-recover from OTW assertion-it requires system-level intervention.

Is the ADP3634ARDZ-R7 pin-compatible with earlier ADP362x series drivers?

Yes-the ADP3634ARDZ-R7 shares identical pinout, package (SOIC_N_EP), and terminal functions with ADP3624ARDZ and ADP3624ARDZ-RL. However, its UVLO threshold (9.5 V min) differs from the ADP3624's 4.5 V min, so direct substitution requires verification of bias rail stability. All timing, drive strength, and thermal protection features remain functionally consistent across the ADP362x/ADP363x family.

What decoupling capacitance is recommended for the VDD pin of the ADP3634ARDZ-R7?

Analog Devices specifies a minimum 4.7 µF low-ESR ceramic capacitor (e.g., X7R MLCC) placed directly between VDD and PGND, supplemented by a 100 nF ceramic capacitor in parallel for high-frequency noise suppression. These capacitors must be located within 2 mm of the ADP3634ARDZ-R7 pins, with short, wide traces to minimize inductance-failure to follow this degrades rise/fall times and risks device damage from VDD rail ringing. The ADP3634ARDZ-R7's performance is highly sensitive to proper decoupling layout.