Analog Devices Inc. DC2458A

Overview

DC2458A from Analog Devices (formerly Linear Technology) is a demonstration board for the LT8608EMSE#PBF 42V, 1.5A micropower synchronous step-down regulator. It delivers a regulated 5V output from 5.5V–42V input, supports Burst Mode® (2.5μA quiescent current), and features selectable operation modes via JP1: Burst Mode®, pulse-skipping, spread-spectrum, or external clock synchronization. It is used to evaluate high-efficiency power conversion in automotive and industrial supply applications.

For engineers reviewing the DC2458A datasheet, DC2458A pinout, DC2458A application, or DC2458A equivalent, key selection considerations include its 2MHz switching frequency, CISPR25 Class 5 radiated EMI compliance with integrated filter, 92.2% efficiency at 12V/0.75A, and configurable SYNC functionality for noise-sensitive embedded systems.

Technical Context

The DC2458A implements the LT8608 monolithic synchronous buck regulator in a fixed 5V output configuration. Its input range (5.5V–42V) targets automotive battery and industrial rail inputs, while the integrated EMI filter-requiring VEMI input connection-enables CISPR25 Class 5 compliance without external redesign.

JP1 provides hardware-selectable operating modes: grounded SYNC for low-ripple Burst Mode®, PULSE SKIPPING for reduced light-load noise, SPREAD SPECTRUM for EMI reduction via VCC-driven modulation, or SYNC position for external clock synchronization (with RT resistor setting f_SW ≤ f_SYNC).

Key Specifications

Availability

DC2458A is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial PLC I/O modules, and test equipment DC-DC evaluation requiring stable component supply and rapid prototyping support.

Supply support for DC2458A 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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.

The DC2458A belongs to Linear Technology's demonstration board portfolio, designed specifically to accelerate evaluation and adoption of their high-efficiency, low-quiescent-current DC-DC regulators in demanding real-world power applications.

FAQ

What is the primary function of the DC2458A?

The DC2458A is a fully assembled demonstration board built around the LT8608EMSE#PBF synchronous step-down regulator. Its primary function is to provide a ready-to-use platform for evaluating the performance-including efficiency, EMI, transient response, and mode-switching behavior-of this 42V, 1.5A micropower buck converter under real operating conditions. The DC2458A simplifies validation before custom design integration.

How do I configure the DC2458A for external clock synchronization?

To configure the DC2458A for external clock synchronization, move jumper JP1 to the SYNC position and apply a clean external clock signal to the SYNC turret (E5). Ensure the LT8608's internal switching frequency-set by the RT resistor-is equal to or lower than the applied SYNC frequency, per the LT8608 datasheet synchronization guidelines. The DC2458A does not include the RT resistor; it must be added per design requirements.

Does the DC2458A support CISPR25 Class 5 radiated emissions compliance?

Yes, the DC2458A achieves CISPR25 Class 5 radiated emissions compliance when the integrated EMI filter is used correctly: the input must be connected to VEMI (not VIN), and L2 (a 0Ω jumper by default) can be replaced with an inductor to further reduce conducted emissions. Radiated EMI test data for both vertical and horizontal antenna polarizations is provided in the demo manual Figures 2 and 3. The DC2458A's layout and filtering are optimized for this standard.

What is the purpose of the VEMI input terminal on the DC2458A?

The VEMI terminal on the DC2458A is the dedicated input connection point for the onboard EMI filter network. To activate the filter and achieve CISPR25-compliant radiated emissions performance, the input source must be connected to VEMI-not the standard VIN terminal. This routing ensures all input current passes through the filter components (including FB1 ferrite bead and optional L2 inductor), suppressing high-frequency noise before it reaches the LT8608. Using VIN bypasses the filter entirely.

Can the DC2458A be used to evaluate load transient response?

Yes, the DC2458A supports load transient evaluation. Its design includes accessible test points (E3/VOUT, E4/GND) and provisions for series ammeters or shunt-based current measurement. With a variable load capable of sinking up to 1.5A at 5V, users can observe output voltage regulation, ripple, and recovery time during step-load changes. The LT8608's fast switching frequency (2MHz) and internal compensation enable strong transient performance, which the DC2458A makes directly measurable.