Analog Devices Inc. ADP2303ARDZ-3.3-R7

Overview

ADP2303ARDZ-3.3-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 fixed 3.3 V, operating from 3.0 V to 20 V input, featuring ±1.5% output accuracy over temperature and 700 kHz switching frequency for compact filter design in intermediate power rail applications.

For engineers reviewing the ADP2303ARDZ-3.3-R7 datasheet, ADP2303ARDZ-3.3-R7 pinout, ADP2303ARDZ-3.3-R7 application, or ADP2303ARDZ-3.3-R7 equivalent, key selection criteria include verified 3 A load capability at 3.3 V, precision enable threshold (1.2 V typ.) with hysteresis, power-good open-drain output, thermal shutdown (150°C), and SOIC_N_EP package with exposed thermal pad for industrial-grade thermal management.

Technical Context

The ADP2303ARDZ-3.3-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 2048-cycle digital soft start eliminate external loop components and suppress inrush current.

It features a precision enable input with 100 mV hysteresis and 1.2 µA pull-down, supporting reliable sequencing and programmable UVLO; the PGOOD output provides active-high, open-drain status signaling with 32-cycle deglitching and 87.5% rising threshold relative to FB reference.

Key Specifications

Pinout & Package

ADP2303ARDZ-3.3-R7 is housed in an 8-lead SOIC_N_EP (SOIC narrow with exposed paddle) package, rated for −40°C to +125°C junction temperature. The exposed thermal pad (Pin 9, EPAD) must be soldered to a PCB ground plane for effective heat dissipation (θ_JA = 58.5°C/W).

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 TPS54332DR, ADP2303ARDZ-3.3-R7 uniquely combines 3 A capability, 700 kHz operation, ±1.5% accuracy, integrated PGOOD, and SOIC_N_EP thermal performance - making it optimal for space-constrained, thermally demanding industrial and medical 3.3 V rails requiring high confidence in regulation integrity.

Availability

ADP2303ARDZ-3.3-R7 is available at Aetrix Electronics and suitable for industrial PLCs, medical patient monitors, telecom baseband boards, and automotive infotainment head units requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for ADP2303ARDZ-3.3-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 intermediate power conversion in space- and thermal-constrained embedded systems - emphasizing integration, protection, and ease of design with ADIsimPower™.

FAQ

What is the maximum continuous output current of the ADP2303ARDZ-3.3-R7?

The ADP2303ARDZ-3.3-R7 delivers up to 3 A continuous output current at its fixed 3.3 V output, validated across −40°C to +125°C junction temperature with derating per thermal conditions. This rating assumes proper PCB layout with the exposed paddle soldered to a thermal plane and adequate airflow or heatsinking per the 58.5°C/W θ_JA spec.

Does the ADP2303ARDZ-3.3-R7 require external feedback resistors?

No, the ADP2303ARDZ-3.3-R7 is the fixed-output variant - its FB pin is internally connected to the 3.3 V output, eliminating the need for external resistive dividers. This simplifies layout, improves regulation accuracy by removing resistor tolerance and thermal drift effects, and reduces BOM count compared to adjustable versions like ADP2303ARDZ-R7.

How does the power-good (PGOOD) function work on the ADP2303ARDZ-3.3-R7?

The ADP2303ARDZ-3.3-R7's PGOOD pin is an open-drain output that pulls low when the FB voltage falls below 82.5% of the internal 0.8 V reference (i.e., VOUT < 2.72 V), and goes high (when pulled up externally) when FB exceeds 87.5% (VOUT > 2.89 V). It includes 32-cycle deglitching to reject noise-induced false trips, ensuring reliable system power sequencing.

Can the ADP2303ARDZ-3.3-R7 operate from a 3.3 V input?

Yes, the ADP2303ARDZ-3.3-R7 supports input voltages as low as 3.0 V, but operation at VIN = 3.3 V requires careful attention to bootstrap charging: the minimum VIN–VOUT differential must exceed 2.1 V for reliable startup under prebias conditions. At exactly 3.3 V input, the device may fail to start unless a minimum load is present to charge the BST capacitor - consider external bootstrap bias for robust 3.3 V-in operation.

What package type and thermal characteristics does the ADP2303ARDZ-3.3-R7 use?

The ADP2303ARDZ-3.3-R7 uses an 8-lead SOIC_N_EP package with exposed thermal pad (EPAD). Its thermal resistance is θ_JA = 58.5°C/W on a JEDEC 4-layer board. To achieve rated 3 A performance, the EPAD must be soldered to a solid GND plane with ≥4 thermal vias (0.3 mm diameter) connecting to inner/ground layers - insufficient thermal coupling will trigger thermal shutdown before current limit.