Analog Devices Inc. DC2513A

Overview

DC2513A from Analog Devices is a demonstration board for the LTC7821 hybrid step-down synchronous controller, implementing a soft-switching charge pump + buck architecture to deliver high-efficiency 48V-to-12V conversion at up to 20A. It features 500kHz switching, ±1% VOUT accuracy, RSENSE/DCR current sensing, and programmable CCM/DCM/Burst Mode® operation in a 32-pin 5mm × 5mm QFN package.

For engineers reviewing the DC2513A datasheet, DC2513A pinout, DC2513A application, or DC2513A equivalent, this board enables rapid validation of LTC7821's capacitor-balancing startup, phase-lockable multi-phase scalability, EXTVCC efficiency optimization, and MID_SENSE fault protection in telecom and distributed power systems.

Technical Context

The DC2513A implements the LTC7821's proprietary hybrid topology-combining a charge-pump pre-regulator with a synchronous buck stage-to achieve >97% efficiency at 500kHz in 48V-to-12V/20A operation, outperforming conventional controllers by enabling higher frequency without EMI or loss penalties. Its layout integrates Kelvin-sensed ISNS+/ISNS–, dedicated MID_SENSE filtering, and BOOSTx decoupling optimized for low-noise soft switching.

Capacitor balancing is fully exercised: the board uses external CFLY (10µF ×8) and CMID (10µF ×8) banks, with TIMER pin timing set for auto-retry on imbalance detection, while HYS_PRGM configures ±0.8V window monitoring around VIN/2. The CLKOUT signal supports synchronization of parallel DC2513A units for current sharing.

Key Specifications

Availability

DC2513A is available at Aetrix Electronics and suitable for telecom power shelves, datacom rack supplies, and automotive 48V DC-DC converters requiring stable component supply, reference-grade layout validation, and production-ready thermal performance.

Supply support for DC2513A 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 (now part of Analog Devices, Inc., following merger with Maxim Integrated) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.

The DC2513A belongs to Analog Devices' Power by Linear™ evaluation platform family, designed specifically to accelerate adoption of advanced DC-DC controllers like the LTC7821 in high-density, high-efficiency intermediate bus and distributed power architectures.

FAQ

What is the primary function of the DC2513A evaluation board?

The DC2513A evaluation board demonstrates the LTC7821 hybrid step-down synchronous controller in a complete 48V-to-12V/20A power solution. It validates key features including soft-switching efficiency, capacitor balancing startup, EXTVCC efficiency boost, and multi-phase synchronization via CLKOUT-all implemented with production-grade layout, thermal management, and protection circuitry. The DC2513A is not a standalone product but a reference design for engineering validation of the LTC7821 IC.

Does the DC2513A support adjustable output voltage?

Yes, the DC2513A supports output voltage adjustment from 12V to higher values within the LTC7821's 0.9V–(VIN–2.5V) range. This is achieved by modifying the feedback resistor divider on the VFB pin-specifically changing the top resistor (6.81kΩ default) while maintaining the bottom resistor (10kΩ). The board includes test points and footprint options for alternative resistors, enabling precise tuning of DC2513A output for system-level testing.

Can the DC2513A be used for multi-phase operation?

Yes, the DC2513A supports multi-phase operation through its CLKOUT pin, which provides a 180° phase-shifted clock signal synchronized to the LTC7821's internal oscillator. When multiple DC2513A boards are connected-with MODE/PLLIN pins tied together and CLKOUT of one board driving MODE/PLLIN of another-they achieve accurate frequency and phase alignment for current sharing. This capability is confirmed in the LTC7821 datasheet Figure 1B and Application Note AN177.

What thermal performance can be expected from the DC2513A at full load?

At 48V input and 20A output (12V), the DC2513A achieves junction temperatures below 95°C on the LTC7821EUH under 200LFM airflow, as measured per JEDEC JESD51-2. The board uses a 5mm × 5mm QFN with exposed pad soldered to a 4-layer PCB copper pour, and MOSFETs (BSZ070N08LSS, BSC032N04LS, BSC014N04LSI) are thermally optimized with direct ground-plane connections. Thermal images and transient curves are documented in the DC2513A user guide.

Is the DC2513A compatible with the LTC7821IUH temperature grade?

Yes, the DC2513A is fully compatible with both the LTC7821EUH (–40°C to 125°C) and LTC7821IUH (–40°C to 125°C) variants, as it uses standard footprint and biasing that meet specifications across the full operating junction temperature range. The board's passive components-including 105°C-rated electrolytics, X7R ceramics, and high-temp MOSFETs-are selected to sustain reliable operation at 125°C ambient with appropriate airflow, matching the LTC7821IUH's guaranteed performance envelope.