Analog Devices Inc. ADP2302ARDZ

Overview

ADP2302ARDZ from Analog Devices is a 2 A, nonsynchronous step-down DC-DC regulator with integrated high-side MOSFET, 700 kHz fixed-frequency current-mode control, 3.0 V to 20 V input range, and adjustable 0.8 V output voltage - used in intermediate power rail conversion for industrial instrumentation and communications systems.

For engineers reviewing the ADP2302ARDZ datasheet, ADP2302ARDZ pinout, ADP2302ARDZ application, or ADP2302ARDZ equivalent, key selection criteria include its ±1.5% output accuracy over temperature, precision enable with 100 mV hysteresis, power-good output, thermal shutdown at 150°C, and SOIC_N_EP package with exposed thermal pad.

Technical Context

The ADP2302ARDZ implements fixed-frequency peak current-mode PWM control above light load thresholds and transitions smoothly to pulse-skip mode for improved efficiency at low loads. Its internal compensation eliminates external loop components, while integrated bootstrap diode and soft-start circuitry (2048 clock cycles) simplify design and prevent inrush current.

It features automatic UVLO (2.9 V rising / 2.4 V falling), overcurrent protection with 2.7–4.4 A peak limit, and power-good monitoring with 87.5% rising threshold and 32-cycle deglitching - all operating across −40°C to +125°C junction temperature range.

Key Specifications

Pinout & Package

ADP2302ARDZ is housed in an 8-lead SOIC_N_EP (SOIC narrow with exposed paddle) package, optimized for thermal dissipation via soldered exposed pad connected to PCB ground plane (θJA = 58.5°C/W on JEDEC 4-layer board).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down regulator applications.

Compared with LM2678SD-5.0/NOPB and TPS54202DRCT, the ADP2302ARDZ offers unique value in adjustable output, precision enable with hysteresis, and power-good signaling - making it optimal for multi-rail systems requiring controlled startup and flexible voltage scaling.

Availability

ADP2302ARDZ is available at Aetrix Electronics and suitable for industrial instrumentation, communications infrastructure, and medical imaging systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for ADP2302ARDZ 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, industrial, and communications markets since 1965.

The ADP2302ARDZ belongs to Analog Devices' ADP230x family of nonsynchronous buck regulators designed for cost-sensitive, thermally demanding point-of-load applications where simplicity, reliability, and wide input range are critical.

FAQ

What is the maximum output current capability of the ADP2302ARDZ?

The ADP2302ARDZ delivers up to 2 A of continuous output current under typical thermal conditions (θJA = 58.5°C/W, 25°C ambient). This rating assumes adequate PCB copper area for the exposed pad and proper inductor selection. Peak current limit is 2.7–4.4 A depending on BST–SW voltage, enabling short-duration transient handling beyond 2 A. The ADP2302ARDZ datasheet specifies this limit in Table 1 under "Peak Current Limit" for ADP2302.

Does the ADP2302ARDZ require an external catch diode?

Yes, the ADP2302ARDZ requires an external Schottky catch diode connected from the SW pin to GND. As a nonsynchronous buck regulator, it lacks an integrated low-side FET; the diode provides the return path for inductor current during the high-side MOSFET's off-time. Diode selection must consider average current (calculated per Equation 8), reverse voltage rating (>VIN), and forward voltage to minimize conduction loss - the ADP2302ARDZ datasheet recommends 3 A rated devices for full 2 A output.

Can the ADP2302ARDZ operate with a 3.3 V input voltage?

Yes, the ADP2302ARDZ supports a minimum input voltage of 3.0 V, so 3.3 V is fully within specification. However, at low VIN (3–5 V), the internal bootstrap regulator may not generate sufficient gate drive voltage due to dropout limitations. The datasheet recommends adding an external Schottky diode from a 5 V bias source to the BST pin in such cases to ensure reliable high-side FET turn-on and full 2 A output capability.

How is output voltage programmed on the ADP2302ARDZ?

The ADP2302ARDZ uses a resistive voltage divider from VOUT to FB to set output voltage, based on its 0.800 V internal reference. The formula is VOUT = 0.800 V × (1 + RTOP/RBOT). For example, 3.3 V output requires RTOP = 31.6 kΩ and RBOT = 10.2 kΩ (1% tolerance). The ADP2302ARDZ datasheet provides Table 6 with recommended values for common outputs (1.2 V to 5.0 V) and confirms FB pin bias current is only 0.01–0.1 µA, minimizing divider error.

What thermal considerations apply to the ADP2302ARDZ in high-power operation?

The ADP2302ARDZ features thermal shutdown at 150°C with 15°C hysteresis, but sustained operation near this limit degrades reliability. Its SOIC_N_EP package relies on the exposed pad soldered to a thermal pad on the PCB. Analog Devices specifies θJA = 58.5°C/W on a JEDEC 4-layer board - real-world performance depends heavily on copper area, layer count, and airflow. For 2 A output at 12 V → 3.3 V, thermal simulation or IR imaging is recommended to verify junction temperature stays below 125°C under worst-case ambient conditions.