Analog Devices Inc. ADP3000AR-3.3

Overview

ADP3000AR-3.3 from Analog Devices is a micropower step-up/step-down switching regulator with fixed 3.3 V output, operating from 2 V to 30 V input, delivering up to 180 mA in boost mode and 100 mA in buck mode at 400 kHz switching frequency. It integrates on-chip low-battery detection, user-adjustable current limiting, and operates in pulse-frequency modulation (PFM) for ultra-low quiescent current (500 µA), suited for space-constrained portable power supplies.

For engineers reviewing the ADP3000AR-3.3 datasheet, ADP3000AR-3.3 pinout, ADP3000AR-3.3 application, or ADP3000AR-3.3 equivalent, key selection considerations include its dual-mode topology support, 3.3 V ±5% output tolerance, 8-lead SOIC (R-8) package, thermal performance in N-8/R-8/RU-14 variants, and compatibility with Schottky diodes and low-ESR tantalum capacitors in compact DC-DC designs.

Technical Context

The ADP3000AR-3.3 implements a gated oscillator architecture with internal 1.245 V reference and comparator hysteresis (32–50 mV), enabling stable regulation without external compensation. Its PFM control reduces quiescent current to 500 µA during light load, while maintaining 400 kHz nominal switching frequency (350–450 kHz range) across input voltage and temperature.

It supports both step-up (VIN = 2–12.6 V) and step-down (VIN = 2–30 V) operation via external transistor connections at SW1/SW2 pins. The integrated auxiliary gain block (AO/SET) functions as a low-battery detector or error amplifier, with open-collector AO output capable of sinking ≥300 µA.

Key Specifications

Pinout & Package

ADP3000AR-3.3 is packaged in an 8-lead SOIC (R-8) with exposed pad not present; thermal resistance is 120°C/W (junction-to-ambient). Pin functions are validated per Analog Devices Rev. A datasheet Figures 4–6 and Table 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar switching regulator applications.

Compared with MAX630ESA+ and TPS61040DRVR, ADP3000AR-3.3 uniquely combines fixed 3.3 V output, dual boost/buck operation, on-chip current limiting, and low-battery detection in one SOIC-8 device-making it optimal for space- and feature-constrained portable power systems requiring design reuse across multiple input sources.

Availability

ADP3000AR-3.3 is available at Aetrix Electronics and suitable for notebook computers, cellular telephones, and portable instruments requiring stable component supply with long-term industrial availability and consistent parametric performance.

Supply support for ADP3000AR-3.3 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 Norwood, MA.

The ADP3000 product line was designed for micropower DC-DC conversion in battery-powered portable electronics, emphasizing ultra-low quiescent current, dual-mode topology flexibility, and integration of supervisory functions like low-battery detection.

FAQ

What is the output voltage tolerance of the ADP3000AR-3.3?

The ADP3000AR-3.3 provides a fixed 3.3 V output with guaranteed tolerance of ±5% (3.135 V to 3.465 V) over temperature and line/load conditions, achieved via on-chip laser-trimmed resistors-no external feedback components required. This specification is confirmed in Table 1 of the Rev. A datasheet and applies specifically to the ADP3000AR-3.3 variant.

Can the ADP3000AR-3.3 operate in step-down mode from a 12 V input?

Yes, the ADP3000AR-3.3 supports step-down operation from input voltages up to 30 V, including 12 V. In buck configuration, it delivers up to 100 mA at 3.3 V with typical efficiency of 77% (per Figure 32). SW1 connects to VIN and SW2 drives the inductor; a Schottky diode (e.g., 1N5817) is required in series with SW2 if VOUT exceeds 6 V to protect the internal transistor.

What package type is used for the ADP3000AR-3.3?

The ADP3000AR-3.3 is supplied in an 8-lead SOIC (R-8) package per JEDEC MS-012AA, measuring 5.00 mm × 4.00 mm with 1.27 mm lead pitch. Thermal resistance is 120°C/W (junction-to-ambient), and pinout matches Figure 6 of the Rev. A datasheet-distinct from the PDIP (N-8) and TSSOP (RU-14) variants offered in the ADP3000 family.

Does the ADP3000AR-3.3 require external components for feedback?

No, the ADP3000AR-3.3 does not require external feedback resistors. Its FB (SENSE) pin connects internally to a laser-trimmed voltage divider set for 3.3 V output-simplifying design, improving accuracy, and eliminating resistor tolerance errors. External components needed are limited to inductor, output capacitor, Schottky diode (for boost), and optional ILIM resistor for current limiting.

How is low-battery detection implemented on the ADP3000AR-3.3?

Low-battery detection uses the ADP3000AR-3.3's auxiliary gain block: the SET pin serves as non-inverting input referenced to the internal 1.245 V, and AO provides open-collector output sinking ≥300 µA. A resistor divider from VIN to GND sets the trip point (e.g., 33 kΩ + 100 kΩ for ~2.5 V detection), and AO pulls low to signal the host processor-enabling system shutdown before brownout.