Analog Devices Inc. DC422A-A

Overview

DC422A-A from Analog Devices (formerly Linear Technology) is a demonstration board for the LTC3405 synchronous step-down DC/DC converter IC, delivering up to 250mA at 1.8V from a 2.65V–6V input, operating at 1.5MHz switching frequency with Burst Mode™ enabling 25µA no-load quiescent current.

For engineers reviewing the DC422A-A datasheet, DC422A-A pinout, DC422A-A application, or DC422A-A equivalent, key selection considerations include input voltage range compatibility, 1.5MHz fixed-frequency operation, MODE/RUN jumper configuration options, and SOT-23 footprint validation for space-constrained battery-powered designs.

Technical Context

The DC422A-A implements the LTC3405 monolithic synchronous buck regulator in a functional evaluation layout, supporting both pulse-skipping and Burst Mode™ operation via JP1 jumper selection. It provides direct access to RUN and MODE control pins, enabling explicit shutdown and noise-sensitive mode switching.

Designed for low-profile surface-mount deployment, the board integrates all passive components required for stable 1.8V output regulation-including input/output capacitors and power inductor-with VIN and VOUT turrets clearly labeled and physically isolated per side of the PCB.

Key Specifications

Availability

DC422A-A is available at Aetrix Electronics and suitable for battery-powered handheld devices, low-power sensor nodes, and portable medical instrumentation requiring stable component supply and validated reference design implementation.

Supply support for DC422A-A 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 acquired Linear Technology in 2017 and maintains its high-performance analog and power management portfolio, emphasizing precision, efficiency, and reliability in power conversion solutions.

The DC422A-A belongs to Linear's demonstration circuit series for monolithic DC/DC regulators, designed to accelerate prototyping and validation of LTC3405-based power supplies in space- and efficiency-critical applications.

FAQ

What is the primary function of the DC422A-A demonstration board?

The DC422A-A demonstration board implements the LTC3405 synchronous buck regulator to provide a fully assembled, tested reference design for generating a stable 1.8V output from 2.65V–6V input sources. It enables rapid evaluation of efficiency, transient response, and mode-switching behavior without custom PCB development - making DC422A-A ideal for early-stage power architecture validation.

How do I configure the DC422A-A for Burst Mode™ operation?

To enable Burst Mode™ on the DC422A-A, insert jumper JP1 into the upper position to connect the MODE pin to ground. This reduces light-load quiescent current to 25µA and minimizes power loss during idle periods. Leaving the MODE pin floating is prohibited - DC422A-A requires either JP1 upper (Burst Mode™) or lower (pulse-skipping) configuration for reliable operation.

Can the DC422A-A be used to generate output voltages other than 1.8V?

No - the DC422A-A is factory-configured with a fixed 1.8V output using resistor feedback network R1/R2 per LTC3405 datasheet specifications. It does not support adjustable output; for other voltages, users must modify the feedback divider or select a different demo board such as DC422A-B (if available) or design a custom layout based on the LTC3405 datasheet - DC422A-A is not intended for reconfiguration.

What is the purpose of JP2 on the DC422A-A board?

JP2 on the DC422A-A controls the RUN pin of the LTC3405: inserting the jumper into the upper position pulls RUN to ground, placing the regulator in shutdown mode with <1µA supply current. Removing JP2 or placing it in the lower position allows normal operation. This hardware-controlled shutdown feature enables system-level power gating independent of software control - critical for DC422A-A integration into low-power wake/sleep architectures.

Is the DC422A-A compatible with input voltages above 5.5V?

The DC422A-A supports input voltages up to 6V per the LTC3405 absolute maximum rating, but hot-plugging above 5.5V is explicitly prohibited per the Quick Start Guide to prevent overstress. Sustained operation at 6V is permissible only with proper thermal management and derated load conditions - DC422A-A is optimized for 2.65V–5.5V nominal battery inputs, not wide-range industrial supplies.