Analog Devices Inc. DC2785A-B

Overview

DC2785A-B from Analog Devices is a quad-output DC/DC µModule regulator evaluation board for the LTM4668A power module, supporting configurable 1.2A per channel (up to 4.8A total), 2.7V–17V input, and 0.6V–5.5V programmable output voltages across four independent or paralleled channels. It enables rapid validation of multi-rail POL designs for FPGAs, ASICs, and telecom infrastructure.

For engineers reviewing the DC2785A-B datasheet, DC2785A-B pinout, DC2785A-B application, or DC2785A-B equivalent, this board provides full access to RUN, FB, PGOOD, MODE/SYNC, and VOUT pins - enabling real-time configuration of Burst Mode®, PolyPhase® operation, output voltage programming, and dynamic load transient testing under controlled thermal conditions.

Technical Context

The DC2785A-B implements the LTM4668A in a fully populated 49-ball BGA layout with optimized 4-layer PCB stack-up, thermal vias under the module, and discrete 47µF ceramic output capacitors per channel. It supports all LTM4668A operating modes: forced CCM (MODE/SYNC = INTVCC/2), Burst Mode® (MODE/SYNC = INTVCC), and pulse-skipping (MODE/SYNC = GND).

Each channel features independent RUN control, FB resistor networks for 1.5V/1.8V/2.5V/3.3V outputs, and dedicated PGOOD open-drain indicators. The board includes test points for VIN, INTVCC, VOUTx, FBx, and SYNC, plus solder jumpers for mode selection and channel paralleling (e.g., CH1+CH2, CH3+CH4).

Key Specifications

Availability

DC2785A-B is available at Aetrix Electronics and suitable for FPGA power sequencing, multi-rail point-of-load validation, and high-density telecom board bring-up requiring stable component supply and full-feature evaluation capability.

Supply support for DC2785A-B 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 for precision signal chain and power conversion applications.

The DC2785A-B belongs to Analog Devices' µModule evaluation platform family, designed to accelerate design-in of integrated power solutions by providing production-ready layouts, verified thermal performance, and complete mode configurability for complex POL systems.

FAQ

What is the primary function of the DC2785A-B?

The DC2785A-B is an evaluation board specifically built to demonstrate and validate the LTM4668A quad-output µModule regulator. It provides full hardware access to all control and monitoring pins - including RUN, FB, PGOOD, MODE/SYNC, and VOUT - enabling engineers to configure output voltages, test parallel operation, evaluate transient response, and verify thermal performance before integrating the LTM4668A into their final system design.

Does the DC2785A-B support all operating modes of the LTM4668A?

Yes, the DC2785A-B supports all three LTM4668A operating modes: forced continuous conduction mode (CCM) when MODE/SYNC is tied to INTVCC/2, Burst Mode® when MODE/SYNC is tied to INTVCC, and pulse-skipping mode when MODE/SYNC is grounded. Solder jumpers on the board allow quick reconfiguration between these modes without external wiring.

Can I use the DC2785A-B to validate 4.8A single-rail output?

Yes - the DC2785A-B supports full 4-channel paralleling of the LTM4668A to deliver up to 4.8A from a single output rail. The board includes pre-routed traces and solder jumpers to tie together VOUT1–VOUT4, RUN1–RUN4, and FB1–FB4 (with FB2–FB4 connected to INTVCC), enabling seamless 4-phase operation while maintaining current sharing accuracy and reduced input/output ripple.

What output voltages are pre-configured on the DC2785A-B?

The DC2785A-B ships with factory-configured output voltages: 1.5V (CH1), 1.8V (CH2), 2.5V (CH3), and 3.3V (CH4), each set using precision external resistors per the LTM4668A's FB network. All four channels can be individually reconfigured to any voltage between 0.6V and 5.5V by changing the respective R_FB resistor per the formula V_OUT = 0.6V × (60.4k + R_FB) / R_FB.

Is external synchronization supported on the DC2785A-B?

Yes - the DC2785A-B includes a dedicated SMA connector and routing for external clock injection into the MODE/SYNC pin, allowing synchronization of the LTM4668A's 2.25MHz switching frequency to an external source from 1.5MHz to 3MHz. This feature is essential for noise-sensitive applications where EMI reduction via frequency dithering or system-level clock alignment is required.