Analog Devices Inc. DC993A

Overview

DC993A from Analog Devices is a demonstration circuit built around the LTC3542 monolithic synchronous buck regulator, serving as an evaluation platform for low-voltage, high-frequency DC/DC conversion. It supports 2.5V–5.5V input, delivers up to 500mA output, sets V_OUT as low as 0.6V, operates at 2.25MHz, and achieves >90% efficiency in continuous mode-ideal for space-constrained battery-powered handheld devices.

For engineers reviewing the DC993A datasheet, DC993A pinout, DC993A application, or DC993A equivalent, key selection considerations include its fixed-output variants (1.2V/1.5V/1.8V), 27µA sleep current, <1µA shutdown current, pulse-skipping and Burst Mode operation, and compatibility with compact 2×2 mm DFN-packaged LTC3542 ICs.

Technical Context

The DC993A implements the LTC3542's internal 0.6V reference and 2.25MHz constant-frequency PWM control architecture, enabling fast transient response and minimal external component count. Its selectable output voltages (1.2V/1.5V/1.8V) are set via header JP4, while RUN/SHDN is controlled by shunt JP3-directly interfacing with the LTC3542's EN pin.

It supports three operating modes: continuous conduction mode (CCM) for high-load stability, pulse-skipping for low-noise light-load operation, and Burst Mode for ultra-low-quiescent-current standby-each enabled automatically based on load and input conditions without external configuration.

Key Specifications

Availability

DC993A is available at Aetrix Electronics and suitable for battery-powered handheld devices, portable medical monitors, and low-power IoT sensor nodes requiring stable component supply, rapid prototyping support, and validated reference design integration.

Supply support for DC993A 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 (now part of Analog Devices, Inc., following merger with Linear Technology) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.

The DC993A belongs to Linear Technology's Demonstration Circuit (DC) series-designed specifically to accelerate evaluation and adoption of their power ICs, with emphasis on ease-of-use, layout-validated performance, and production-relevant testability.

FAQ

What is the primary function of the DC993A?

The DC993A is a fully assembled demonstration circuit that evaluates the LTC3542 synchronous step-down regulator. It is not a standalone IC but a ready-to-use board implementing the LTC3542's full functionality-including 2.5V–5.5V input, 500mA output, 2.25MHz switching, and selectable 1.2V/1.5V/1.8V outputs. The DC993A provides immediate hardware validation for design-in decisions involving the LTC3542.

Does the DC993A support adjustable output voltage below 1.2V?

Yes-the DC993A's underlying LTC3542 has an internal 0.6V reference, allowing output voltages as low as 0.6V when configured with an external resistor divider. While the onboard JP4 header only supports fixed 1.2V/1.5V/1.8V outputs, the DC993A PCB includes test points and routing to reconfigure V_OUT externally-enabling custom regulation down to 0.6V per the LTC3542 datasheet.

How is enable/shutdown controlled on the DC993A?

Enable/shutdown on the DC993A is implemented via header JP3: placing the shunt in the ON position connects the LTC3542's EN pin to VIN, enabling regulation; placing it in OFF ties EN to GND, forcing shutdown. This matches the LTC3542's active-high enable logic and allows precise control of startup timing and system-level power sequencing.

What are the measured efficiency characteristics of the DC993A?

The DC993A achieves over 90% peak efficiency in continuous conduction mode at medium-to-heavy loads (e.g., 3.6V_IN/1.8V_OUT/300mA). Efficiency remains above 80% even at 10mA load in Burst Mode, and sleep-mode quiescent current is 27µA-critical for maintaining runtime in intermittently active applications like wearable sensors powered by the DC993A.

Are Gerber files and schematic available for the DC993A?

Yes-Gerber files for the DC993A are explicitly referenced in the Quick Start Guide and available upon request from Analog Devices. The schematic is included in the official DC993A documentation, showing all component values, layout-optimized routing, and LTC3542-specific decoupling and feedback network implementation-supporting reverse-engineering, customization, and production copy.