Analog Devices Inc. ADP2302ARDZ-R7

Overview

ADP2302ARDZ-R7 from Analog Devices is a nonsynchronous step-down DC-DC regulator with integrated high-side MOSFET, delivering up to 2 A continuous output current across a 3.0 V to 20 V input range, ±1.5% output voltage accuracy over temperature, and fixed 700 kHz switching frequency - used in intermediate power rail conversion for industrial instrumentation and communications systems.

For engineers reviewing the ADP2302ARDZ-R7 datasheet, ADP2302ARDZ-R7 pinout, ADP2302ARDZ-R7 application, or ADP2302ARDZ-R7 equivalent, key selection considerations include its 0.8 V feedback reference, precision enable threshold (1.2 V typ.), power-good open-drain output, thermal shutdown at 150°C, and SOIC_N_EP package with exposed thermal pad.

Technical Context

The ADP2302ARDZ-R7 employs fixed-frequency peak current-mode PWM control with automatic transition to pulse-skip mode at light loads, enabling high efficiency across wide load ranges. Its internal compensation, integrated bootstrap diode, and digital soft start (2048 clock cycles) eliminate external loop components and reduce inrush current.

It features a precision enable input with 100 mV hysteresis and programmable UVLO behavior, plus robust protection including undervoltage lockout (2.4 V falling / 2.7 V rising), overcurrent limiting (2.7–4.4 A), and overvoltage protection triggered at FB > 0.880 V.

Key Specifications

Pinout & Package

ADP2302ARDZ-R7 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 (θ_JA = 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-3.3/NOPB and TPS54202DR, ADP2302ARDZ-R7 offers tighter output accuracy (±1.5% vs. ±2%), integrated thermal pad for better thermal performance, and fixed 700 kHz operation simplifying EMI filtering - making it optimal for space-constrained, thermally demanding industrial and medical applications requiring predictable timing and robust protection.

Availability

ADP2302ARDZ-R7 is available at Aetrix Electronics and suitable for industrial sensor nodes, communications baseband modules, medical diagnostic equipment, automotive infotainment subsystems, and instrumentation requiring stable component supply and long-term manufacturability.

Supply support for ADP2302ARDZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, healthcare, and communications markets.

The ADP230x family was designed specifically for compact, high-efficiency nonsynchronous buck conversion in space- and thermal-constrained applications - emphasizing integration, protection, and ease of use without external compensation.

FAQ

What is the maximum continuous output current supported by the ADP2302ARDZ-R7?

The ADP2302ARDZ-R7 supports up to 2 A continuous output current under specified thermal conditions (T_J ≤ 125°C). This rating assumes proper PCB layout with the exposed paddle soldered to a thermal ground plane and ambient temperature ≤ 85°C. Peak current limit is 2.7–4.4 A depending on BST–SW voltage, but sustained operation above 2 A risks thermal shutdown.

Does the ADP2302ARDZ-R7 require an external catch diode, and what are its key requirements?

Yes, the ADP2302ARDZ-R7 requires an external Schottky catch diode due to its nonsynchronous architecture. The diode must handle average current up to ~1.8 A (for 3.3 V out at 2 A load), support reverse voltage ≥ VIN(max) + 0.5 V, and exhibit low forward voltage (≤0.5 V) to minimize conduction loss. Recommended types include 3 A, 40 V Schottky diodes such as SB340 or equivalents with low Q_rr.

How does the ADP2302ARDZ-R7 implement power sequencing via the EN pin?

The ADP2302ARDZ-R7 implements power sequencing using its precision enable pin (EN) with 1.2 V typical threshold and 100 mV hysteresis. By connecting EN to a resistor divider from another supply (e.g., a 5 V rail), the ADP2302ARDZ-R7 can be programmed to turn on only after that rail reaches a defined voltage - enabling controlled startup order. An internal 1.2 µA pull-down ensures default disable if left unconnected.

Can the ADP2302ARDZ-R7 operate with an input voltage below 3.0 V, and what are the limitations?

No, the ADP2302ARDZ-R7 has a minimum specified input voltage of 3.0 V per absolute ratings and functional operation. Below this, UVLO prevents startup (rising threshold = 2.7 V), and bootstrap circuitry cannot sustain gate drive for the high-side MOSFET. Attempting operation below 3.0 V may result in erratic switching, failure to regulate, or thermal stress - especially at light loads where bootstrap capacitor charging is marginal.

What is the purpose and implementation of the exposed thermal pad on the ADP2302ARDZ-R7 package?

The exposed thermal pad on the ADP2302ARDZ-R7 (Pin 9, EPAD) serves dual purposes: thermal dissipation and electrical grounding. It must be soldered to a dedicated PCB copper area connected to GND to achieve θ_JA = 58.5°C/W. Failure to connect or insufficient solder coverage increases junction temperature, potentially triggering thermal shutdown at lower load currents. The pad is not electrically isolated and forms part of the internal GND path.