Analog Devices Inc. DC2861A

Overview

DC2861A from Analog Devices is an evaluation board for the LTM4658EY, a low-input-voltage, high-efficiency 10A step-down µModule regulator in a 4mm × 4mm BGA package. It supports input voltages from 2.25V to 5.5V, delivers output voltages from 0.5V to VIN (configured to 1.0V ±1.5% in default setup), operates at 2MHz, and enables soft-start, output tracking, and die temperature monitoring via the SSTT pin.

For engineers reviewing the DC2861A datasheet, DC2861A pinout, DC2861A application, or DC2861A equivalent, this board provides validated measurement setup, configurable PWM/PS mode selection, synchronized switching up to 2.25MHz, load transient testing capability (0A→5A step), and thermal performance validation under full 10A load with no forced airflow.

Technical Context

The DC2861A implements the LTM4658EY in single-phase configuration with internal compensation, enabling stable operation with all-ceramic output capacitors. Its MODE/SYNC pin supports three states: external clock synchronization (1–2.25MHz), clock output, or PWM mode selection (forced continuous or pulse-skipping).

It integrates hardware for dynamic load stepping via IOSTEP_CLK test point, output voltage tracking via TRACK test point, and real-time die temperature monitoring via SSTT. The board uses discrete sense resistor RS1 (0.02Ω) for current sensing and includes ferrite bead L1 for EMI suppression on the input path.

Key Specifications

Availability

DC2861A is available at Aetrix Electronics and suitable for power integrity validation, µModule regulator qualification, and high-current DC/DC design verification requiring stable component supply, repeatable test conditions, and production-ready layout reference.

Supply support for DC2861A 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, power management, and signal chain applications.

The DC2861A belongs to Analog Devices' µModule regulator evaluation platform family, designed to accelerate development of compact, high-efficiency, low-voltage power supplies for space-constrained applications including FPGA, ASIC, and processor core rails.

FAQ

What is the primary function of the DC2861A evaluation board?

The DC2861A evaluation board is a fully assembled and tested demonstration platform for the LTM4658EY µModule regulator. It enables rapid characterization of efficiency, transient response, thermal behavior, and configuration options-including soft-start, output tracking, and mode selection-without requiring custom PCB design. The DC2861A provides accessible test points, jumpers, and documented procedures to validate the LTM4658EY under real-world operating conditions.

How do I configure the DC2861A for pulse-skipping (PS) mode?

To configure the DC2861A for pulse-skipping mode, both the FREQ pin and MODE/SYNC pin must be connected to VIN, as specified in Table 1 of the demo manual. This requires placing JP8 jumper on "VIN" for MODE/SYNC and ensuring the FREQ pin is tied to VIN (not left floating or grounded). In this configuration, the LTM4658EY defaults to PS mode at its 2MHz switching frequency, optimizing light-load efficiency without external clocking.

Can the DC2861A be used to evaluate output voltage tracking?

Yes-the DC2861A supports output voltage tracking via the TRACK test point. An external reference voltage applied to this point allows the LTM4658EY's output to follow that voltage during startup and regulation. This feature is validated in the demo manual's Quick Start Procedure and enables coordinated sequencing with other rails in multi-rail systems. The DC2861A includes no additional circuitry beyond the LTM4658EY's native tracking interface.

What are the input and output connection methods on the DC2861A?

The DC2861A uses banana jacks (J1, J2, J3, J4, J5) for VIN, VOUT, GND, and VEMI connections, plus BNC connectors (J6, J7) for IOSTEP and IOSTEP_CLK signals. Test points (E1–E8) provide direct access to key nodes including RUN, PGOOD, TRACK, CLK, and SW. All critical signals are routed to labeled, gold-plated turret test points for oscilloscope probing and load injection without soldering.

Does the DC2861A support synchronization to an external clock source?

Yes-the DC2861A supports external clock synchronization via the MODE/SYNC pin and CLK test point. With JP8 set to "CLK", an external clock signal (1MHz–2.25MHz) applied to the CLK test point synchronizes the LTM4658EY's switching frequency. This capability is essential for noise-sensitive applications and EMI reduction in systems with multiple switching regulators. The DC2861A's schematic and layout preserve signal integrity for this function.