Analog Devices Inc. DC1987A

Overview

DC1987A from Analog Devices is an evaluation board for the LTM8057 2kV AC isolated flyback µModule DC/DC converter, designed to demonstrate safe, compact, and efficient isolated power conversion in industrial and test equipment. It supports 3.1V–31V input, delivers up to 440mA at adjustable 2.5V–12V output, and integrates transformer, controller, switches, and support circuitry in a 9mm × 11.25mm × 4.92mm BGA package.

For engineers reviewing the DC1987A datasheet, DC1987A pinout, DC1987A application, or DC1987A equivalent, this page provides verified layout guidance, isolation compliance details (UL60950 File 464570), thermal performance data, soft-start capacitor selection, and BIAS pin configuration best practices for rapid prototyping of isolated 2.5–12V supplies.

Technical Context

The DC1987A implements the LTM8057's full 2kV AC isolation architecture with primary-side VIN, RUN, ADJ, SS, BIAS, and GND pins separated by ≥3.03mm PCB creepage/clearance, validated via 3kV DC hi-pot testing. Its layout enforces strict separation between primary and secondary copper planes, including dedicated VOUT– return routing and thermal vias under GND/VOUT– pads to manage junction temperature rise ≤12°C at 400mA load (24VIN/5VOUT).

It demonstrates current-mode control with programmable soft-start (via SS-to-GND capacitor), user-configurable undervoltage lockout (via RUN divider), and BIAS-assisted efficiency optimization-enabling >75% peak efficiency across 5V–12V outputs while maintaining <20mV RMS ripple at 100mA load.

Key Specifications

Availability

DC1987A is available at Aetrix Electronics and suitable for industrial sensors, test and measurement equipment, and industrial switches requiring stable component supply, rapid evaluation of isolated DC/DC converters, and UL-compliant safety validation.

Supply support for DC1987A 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 leader specializing in high-performance analog, mixed-signal, and power management ICs, with deep expertise in isolated power, signal conditioning, and precision timing.

The DC1987A belongs to Analog Devices' µModule evaluation board family, engineered to accelerate adoption of fully integrated, safety-certified power modules in space-constrained, high-reliability industrial and instrumentation applications.

FAQ

What is the purpose of the DC1987A evaluation board?

The DC1987A evaluation board is designed exclusively to demonstrate and validate the LTM8057 2kV AC isolated µModule DC/DC converter. It provides a production-ready PCB layout with optimized thermal vias, isolation-compliant creepage distances, and pre-validated component values (CIN, COUT, RADJ) for 2.5V–12V outputs. Engineers use DC1987A to verify performance metrics-including efficiency, ripple, soft-start behavior, and thermal rise-before integrating the LTM8057 into end systems.

Does DC1987A support all LTM8057 variants, including MP-grade parts?

Yes, DC1987A supports all LTM8057 variants (EY, IY, MPY) because it interfaces only with the standard LTM8057 BGA-38 pinout and electrical interface. The board's layout accommodates both SnPb and RoHS terminal finishes, and its thermal design meets the –55°C to 125°C internal temperature range requirement of the LTM8057MPY variant, as confirmed by junction temperature rise measurements in Figures G24–G28.

How does DC1987A implement 2kV AC isolation compliance?

DC1987A achieves 2kV AC isolation compliance through physical layout: primary-side (VIN, RUN, ADJ, SS, BIAS, GND) and secondary-side (VOUT, VOUT–) copper are separated by ≥3.03mm, matching the LTM8057's internal 0.75mm metal-to-metal isolation plus PCB-level spacing. It follows Analog Devices' recommended layout in Figure 3, includes two missing BGA column gaps to maximize clearance, and is validated per UL60950 (File 464570) with functional insulation classification.

Can DC1987A be used to evaluate BIAS pin optimization?

Yes, DC1987A includes dedicated test points and jumper options to evaluate BIAS pin configurations: direct connection to VIN, external 3.1V–15V bias supply, or open-circuit operation. Its layout incorporates the required ≥4.7µF low-ESR capacitor (CBIAS) and supports efficiency comparison-e.g., >3% improvement at 5VIN/5VOUT when BIAS is externally supplied versus internal regulation-as documented in the LTM8057 datasheet Section 11.

What safety-rated capacitors are recommended for use with DC1987A?

DC1987A provides mounting locations for safety-rated capacitors between GND and VOUT–, as specified in Table 2 of the LTM8057 datasheet. Validated options include Murata GA343DR7GD472KW01L (4700pF, 250V AC, X7R) and Johanson 302R29W471KV3E (470pF, 250V AC, X7R). These capacitors reduce high-frequency output noise and support reinforced insulation in pollution degree 2 environments up to 250V working voltage.