Analog Devices Inc. ADP3635ARHZ-RL

Overview

ADP3635ARHZ-RL from Analog Devices is a high-speed, dual-channel, 4 A low-side MOSFET driver with integrated thermal protection, 9.5 V to 18 V supply range, 10 ns typical rise/fall time at 2.2 nF load, and matched propagation delays-designed for synchronous rectification in high-frequency DC-to-DC converters.

For engineers reviewing the ADP3635ARHZ-RL datasheet, ADP3635ARHZ-RL pinout, ADP3635ARHZ-RL application, or ADP3635ARHZ-RL equivalent, key selection criteria include UVLO threshold (8.7 V typ), overtemperature warning (135 °C typ), OTW open-drain flag, SOIC_N_EP vs. MINI_SO_EP thermal performance, and inverting/noninverting input configuration per channel.

Technical Context

The ADP3635ARHZ-RL implements dual independent low-side gate drivers optimized for N-channel MOSFETs, featuring precise internal shutdown comparator logic, UVLO with 1.0 V hysteresis, and two-tier thermal protection: active-low OTW flag at 135 °C (typ) and hard shutdown at 165 °C (typ).

It supports parallel operation of both outputs to increase drive strength, accepts 3.3 V–compatible digital inputs with internal pull-down, and delivers ±4 A peak source/sink current into capacitive loads-enabling fast switching in high-efficiency power stages up to 300 kHz.

Key Specifications

Pinout & Package

ADP3635ARHZ-RL is housed in an 8-lead MINI_SO_EP package with exposed thermal pad, offering 43°C/W θJA (JEDEC 4-layer board) for enhanced power dissipation in space-constrained layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADP3634ARHZ-RL and LM5113SDX/NOPB, the ADP3635ARHZ-RL uniquely combines inverting/noninverting input flexibility, integrated OTW signaling, and industry-standard pin compatibility-making it optimal for compact, thermally managed synchronous rectifier designs requiring mixed logic polarity.

Availability

ADP3635ARHZ-RL is available at Aetrix Electronics and suitable for AC-to-DC switch mode power supplies, DC-to-dc power supplies, and synchronous rectification applications requiring stable component supply, RoHS-compliant packaging, and long-term industrial temperature support (−40°C to +85°C).

Supply support for ADP3635ARHZ-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 ADP36xx family was developed specifically for high-frequency, high-reliability power conversion systems-emphasizing thermal robustness, precise protection thresholds, and seamless integration with digital power controllers.

FAQ

What is the UVLO turn-on threshold voltage for ADP3635ARHZ-RL?

The ADP3635ARHZ-RL has a UVLO turn-on threshold of 8.7 V (typical) at 25°C, with guaranteed minimum 8.0 V and maximum 9.5 V across temperature. This ensures the driver remains disabled until the VDD rail stabilizes above 8.0 V, preventing premature or unstable gate drive during power-up sequences in 12 V–15 V power systems.

Does ADP3635ARHZ-RL support parallel operation of its two output channels?

Yes, ADP3635ARHZ-RL supports parallel operation: OUTA and OUTB can be externally connected to double peak current drive to ±8 A and reduce thermal load per channel. The datasheet confirms matched propagation delays (≤2 ns) and identical output characteristics, enabling balanced current sharing when layout symmetry and equal gate resistances are maintained.

What is the function of the OTW pin on ADP3635ARHZ-RL?

The OTW (Overtemperature Warning) pin on ADP3635ARHZ-RL is an open-drain, active-low output that pulls low when the die temperature reaches 135 °C (typical). It remains asserted until temperature drops by ≥10 °C hysteresis, allowing system-level thermal monitoring, fan activation, or power derating-without requiring external temperature sensors or ADC resources.

How does the input configuration differ between ADP3635ARHZ-RL and ADP3634ARHZ-RL?

ADP3635ARHZ-RL features an inverting input (INA) for Channel A and a noninverting input (INB) for Channel B, whereas ADP3634ARHZ-RL uses noninverting inputs on both channels. This makes ADP3635ARHZ-RL ideal for topologies requiring complementary drive signals-such as synchronous rectifiers where one MOSFET must turn on when the other turns off-without external inverters.

What package type and thermal performance does ADP3635ARHZ-RL use?

ADP3635ARHZ-RL uses the 8-lead MINI_SO_EP package (RH-8-1) with exposed thermal pad, delivering 43°C/W junction-to-ambient thermal resistance on a JEDEC 4-layer board. This is 27% lower than the SOIC_N_EP variant (59°C/W), making it preferred for high-power-density designs where ambient temperatures exceed 70°C or airflow is limited.