Analog Devices Inc. ADP2303ARDZ-R7

Overview

ADP2303ARDZ-R7 from Analog Devices is a nonsynchronous step-down DC-DC regulator with integrated high-side MOSFET, delivering up to 3 A continuous output current at 700 kHz switching frequency, ±1.5% output voltage accuracy, and 0.8 V minimum adjustable output - used in intermediate power rail conversion for industrial instrumentation and communications equipment.

For engineers reviewing the ADP2303ARDZ-R7 datasheet, ADP2303ARDZ-R7 pinout, ADP2303ARDZ-R7 application, or ADP2303ARDZ-R7 equivalent, key selection criteria include input voltage range (3.0–20 V), thermal shutdown threshold (150°C), PGOOD open-drain signaling, precision enable with 100 mV hysteresis, and SOIC_N_EP package thermal performance (θJA = 58.5°C/W).

Technical Context

The ADP2303ARDZ-R7 implements 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 (1.2 V threshold, 100 mV hysteresis), undervoltage lockout (2.2–2.9 V window), and overcurrent protection with peak current limit of 4.6–6.4 A. The power-good output provides active-high open-drain status with 82.5–92.5% regulation window and 32-cycle deglitch timing.

Key Specifications

Pinout & Package

ADP2303ARDZ-R7 is housed in an 8-lead SOIC_N_EP package with exposed paddle, optimized for thermal dissipation on standard 4-layer PCBs (θJA = 58.5°C/W). The exposed pad must be soldered to a dedicated ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2678SD-3.3/NOPB and TPS54331DR, ADP2303ARDZ-R7 offers superior integration (internal bootstrap diode, soft start, PGOOD), tighter enable hysteresis (100 mV vs. none or 200 mV), and higher switching frequency - reducing passive component footprint by ~40% while maintaining 3 A capability and industrial-grade thermal protection.

Availability

ADP2303ARDZ-R7 is available at Aetrix Electronics and suitable for industrial instrumentation, communications infrastructure, and healthcare monitoring applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADP2303ARDZ-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, industrial, communications, and healthcare markets.

The ADP230x family was designed specifically for compact, high-efficiency intermediate power rail conversion in space- and thermal-constrained systems - emphasizing integration, ease of use, and robust protection features.

FAQ

What is the maximum continuous output current supported by ADP2303ARDZ-R7?

ADP2303ARDZ-R7 supports up to 3 A continuous output current under typical thermal conditions (TA = 25°C, θJA = 58.5°C/W, adequate PCB copper). Peak current limit is specified at 4.6–6.4 A depending on BST–SW voltage, enabling robust short-circuit handling. Derating is required above 85°C ambient or with limited airflow.

Does ADP2303ARDZ-R7 require an external bootstrap diode?

No, ADP2303ARDZ-R7 integrates a bootstrap diode internally, eliminating the need for an external component between VIN and BST. A 0.1 µF ceramic capacitor must still be placed between BST and SW pins to sustain gate drive voltage for the integrated high-side MOSFET during operation.

Can ADP2303ARDZ-R7 be used with a fixed 3.3 V output without external feedback resistors?

No - ADP2303ARDZ-R7 is the adjustable version (suffix -ARDZ indicates FB-controlled configuration). Fixed-output variants (e.g., ADP2303ARDZ-3.3) exist separately. To set 3.3 V output with ADP2303ARDZ-R7, connect a resistive divider (RTOP = 31.6 kΩ, RBOT = 10.2 kΩ, both ±1%) between VOUT and GND, with FB tied to the divider junction.

What is the purpose of the PGOOD pin on ADP2303ARDZ-R7?

The PGOOD pin on ADP2303ARDZ-R7 is an active-high open-drain output that signals valid regulation: it asserts high when the FB voltage is within 82.5–92.5% of the 0.8 V reference (i.e., output is within ±12.5% of target), with 32-cycle deglitch timing. It enables safe power sequencing of downstream ICs like FPGAs or processors.

How does the precision enable function work on ADP2303ARDZ-R7?

ADP2303ARDZ-R7's EN pin has a 1.12–1.28 V enable threshold with 100 mV hysteresis and 1.2 µA internal pull-down. This allows reliable startup sequencing from other rails (e.g., using a resistor divider from a 5 V supply) and programmable UVLO behavior - preventing false turn-on during slow VIN ramps or brownout conditions.