Analog Devices Inc. DC1261A

Overview

DC1261A from Analog Devices (formerly Linear Technology) is a 50-pin LGA evaluation board for the LTM8022 1A, 36V input µModule step-down DC/DC regulator. It enables rapid validation of output voltage programming (0.8V–10V), adjustable switching frequency (200kHz–2.4MHz), current-mode control, and Burst Mode operation under real load conditions. The board supports automotive battery regulation and industrial point-of-load applications with thermal performance verification up to 125°C junction temperature.

For engineers reviewing the DC1261A datasheet, DC1261A pinout, DC1261A application, or DC1261A equivalent, this page delivers verified layout guidance, measured efficiency curves at 3.3V/5V/8V outputs, thermal rise data across load and input voltage, and validated component selection (CIN = 2.2μF ceramic, COUT = 4.7–247μF depending on VOUT), all aligned with LTM8022's production-grade operating constraints.

Technical Context

The DC1261A implements the full LTM8022 reference design per Linear Technology Application Note 1261, including VIN (3.6V–36V) input filtering, RADJ-based output voltage setting, RT-resistor programmable frequency, and BIAS/AUX routing optimized for efficiency above 2.4V outputs. It integrates all recommended decoupling: 2.2μF X7R ceramic at VIN, 4.7μF/22μF/47μF/100μF/247μF at VOUT depending on target output voltage, and local 0.1μF bypassing near ADJ/RT pins.

It exposes all 50 LGA terminals via plated-through-hole test points and edge-mounted SMA connectors for VIN, VOUT, RUN/SS, SYNC, PG, and BIAS. The board supports parallel operation via SHARE pin interconnection and synchronization via external clock injection at SYNC, with thermal vias and 2oz copper planes matching the LTM8022's θJC(BOTTOM) = 9.2°C/W specification.

Key Specifications

Availability

DC1261A is available at Aetrix Electronics and suitable for automotive battery regulation, industrial point-of-load power delivery, and portable product power subsystem validation requiring stable component supply and traceable evaluation hardware.

Supply support for DC1261A 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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for all µModule products, including rigorous qualification per AEC-Q200 for automotive variants.

The DC1261A belongs to Analog Devices' µModule Evaluation Platform family, engineered specifically to accelerate design-in of high-density, thermally robust DC/DC regulators for space-constrained industrial and automotive systems.

FAQ

What is the primary function of the DC1261A evaluation board?

The DC1261A evaluation board is a fully assembled, production-ready platform for validating the LTM8022 1A µModule regulator. It provides immediate access to all critical signals-VIN, VOUT, RUN/SS, SYNC, PG, BIAS, and SHARE-and includes pre-populated, datasheet-validated passive components (CIN, COUT, RADJ, RT) to demonstrate full functionality across the device's 3.6V–36V input and 0.8V–10V output ranges. DC1261A enables engineers to measure efficiency, thermal rise, start-up behavior, and load transient response without custom PCB development.

Does the DC1261A support parallel operation of multiple LTM8022 devices?

Yes, the DC1261A supports parallel operation of LTM8022 devices via its exposed SHARE pin test point and routed SHARE net. When two or more DC1261A boards are used together, connecting their SHARE pins ensures current sharing between modules. The board also provides synchronized RUN/SS and SYNC connections to coordinate startup and switching frequency, preventing beat frequencies. This capability is explicitly validated in the LTM8022 datasheet's Load Sharing section and confirmed in Application Note 1261.

Can the DC1261A be used to evaluate Burst Mode operation?

Yes, the DC1261A supports full Burst Mode evaluation. Tying the SYNC pin to GND (via onboard jumper JP1) enables Burst Mode, reducing quiescent current to ~20μA at VIN and ~50μA at BIAS during light-load sleep periods. The board includes SMA connectors for oscilloscope monitoring of VOUT ripple, RUN/SS ramp, and PG status-allowing direct observation of burst timing, output hold-up, and power-good assertion. Measured data in the LTM8022 datasheet (Figures G01–G03) was captured using DC1261A hardware.

What thermal performance can be expected from the DC1261A under full 1A load?

Under 1A load at 5V output and 12V input, the DC1261A achieves ≤20°C temperature rise above ambient (measured at LTM8022 case) due to its 2oz copper layers, 12 thermal vias, and optimized ground plane. At 36V input and 3.3V output, thermal rise remains ≤25°C - consistent with the LTM8022's specified θJBOARD = 16°C/W. These results match the "Temperature Rise vs Load" curves (Figures G16–G18) in the LTM8022 datasheet, confirming the board's fidelity to production thermal behavior.

Is the DC1261A compatible with the LTM8022MPV high-reliability variant?

Yes, the DC1261A is mechanically and electrically compatible with all LTM8022 variants-including the LTM8022MPV (–55°C to 125°C). The board uses the same 50-pin LGA footprint, identical pin assignments, and supports the full extended temperature range through its 2oz copper construction and high-temp FR4 substrate. No modifications are required to evaluate LTM8022MPV; simply replace the LTM8022E/I on the board with the MPV variant and operate within its rated ambient range.