Analog Devices Inc. DC457B

Overview

DC457B from Analog Devices is a dual-output, 2-phase synchronous buck controller evaluation board based on the LTC3727-1 IC, delivering regulated 5V/4A and 12V/3A outputs with low EMI operation at 530kHz, integrated 7.5V/50mA and 3.3V/25mA linear regulators, and selectable Burst Mode® or constant-frequency light-load operation for server power, telecom rectifiers, and industrial computing systems.

For engineers reviewing the DC457B datasheet, DC457B pinout, DC457B application, or DC457B equivalent, key selection considerations include input voltage range (15V–25V), output accuracy (±3% for 5V/12V rails), peak efficiency (96%), dual-phase interleaving for EMI reduction, and support for standby-mode wake-up circuitry via on-chip LDOs.

Technical Context

The DC457B implements two independent synchronous buck controllers operating 180° out of phase to minimize input ripple current and conducted EMI. Each channel uses external high-side MOSFETs, current-mode control with cycle-by-cycle current limiting, and overcurrent latch-off with optional external disable.

It integrates two monolithic linear regulators (7.5V/50mA and 3.3V/25mA) that remain active in standby mode to power system wake-up circuitry. The board supports both Burst Mode® (for peak light-load efficiency) and burst-disable mode (for low-noise, constant-frequency operation down to 1% load).

Key Specifications

Availability

DC457B is available at Aetrix Electronics and suitable for telecom rectifier modules, server VRM validation, and industrial embedded power subsystems requiring stable component supply, pre-validated multi-rail performance, and low-EMI reference designs.

Supply support for DC457B 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 is a global semiconductor leader specializing in high-performance analog, mixed-signal, and power management solutions for precision signal chain and power applications.

The DC457B belongs to Analog Devices' demonstration circuit series for multi-phase DC/DC controllers, designed to accelerate validation of high-efficiency, low-EMI power architectures in data center, networking, and industrial infrastructure.

FAQ

What is the maximum input voltage rating for the DC457B demonstration board?

The DC457B board is validated for 15V to 25V input operation. While the underlying LTC3727-1 IC operates up to 36V, the board's input capacitors and MOSFETs are rated for ≤25V. Exceeding 25V requires higher-voltage-rated external components - a modification not supported by the standard DC457B configuration.

Does the DC457B support independent enable control for each output rail?

Yes, the DC457B provides separate RUN/SS1 and RUN/SS2 jumpers to independently enable or soft-start the 5V and 12V output channels. This allows staged power-up sequencing, fault isolation, and flexible system-level power management during evaluation and prototyping.

Can the DC457B operate in Burst Mode® and constant-frequency mode simultaneously on both outputs?

No - Burst Mode® or burst-disable mode is selected globally via the FREQ jumper setting on the DC457B. Both outputs follow the same light-load operating mode; independent mode selection per rail is not implemented on this board.

What is the purpose of the FCB jumper on the DC457B board?

The FCB (Feedback Compensation) jumper on the DC457B configures the compensation network for the 5V output loop. When set to GND, it selects the default Type II compensation optimized for the standard 5V/4A output stage. Alternative compensation configurations require hardware modification and are not supported in the stock DC457B layout.

Is thermal performance data provided for the DC457B at full load?

The DC457B Quick Start Guide specifies performance over 0°C to 50°C ambient but does not publish junction temperatures, heatsink requirements, or derating curves. Full 5V/4A + 12V/3A operation is verified within this ambient range using the board's native copper pour and component placement; forced airflow is not required under nominal conditions.