Analog Devices Inc. ADP2105-1.8-EVALZ

Overview

ADP2105-1.8-EVALZ from Analog Devices is an evaluation board for the ADP2105-1.8 synchronous step-down DC-to-DC converter, delivering a fixed 1.8 V ±1% output at up to 1 A load current. It operates from 2.7 V to 5.5 V input, achieves >95% peak efficiency, and features 1.2 MHz switching frequency with PFM/PWM mode transition for light-load power conservation.

For engineers reviewing the ADP2105-1.8-EVALZ datasheet, ADP2105-1.8-EVALZ pinout, ADP2105-1.8-EVALZ application, or ADP2105-1.8-EVALZ equivalent, this board enables rapid validation of power stage performance-including load/line regulation, transient response (5% overshoot @ 1 A step), output ripple (<20 mV in PWM mode), and efficiency across input voltage and load ranges-using standard bench equipment and minimal external setup.

Technical Context

The ADP2105-1.8-EVALZ implements a complete, fully assembled reference design for the ADP2105-1.8 IC, integrating a 3.3 µH shielded ferrite inductor (SD3814), dual 22 µF X5R ceramic output capacitors, 4.7 µF input capacitors, and optimized compensation (274 kΩ resistor + 39 pF capacitor) for stable 1.8 V regulation. Its layout supports high-frequency operation with minimized parasitic inductance and thermal resistance.

This board uses current-mode PWM control at medium-to-heavy loads and automatically transitions to PFM mode below ~10 mA to maintain ultra-low quiescent current (20 µA) and shutdown current (0.1 µA). All critical components-including enable logic interface, soft-start timing capacitor (C5), and feedback network-are preconfigured for fixed 1.8 V output without modification.

Key Specifications

Availability

ADP2105-1.8-EVALZ is available at Aetrix Electronics and suitable for power supply validation, DC-DC converter qualification, and embedded system bring-up requiring stable component supply and documented reference performance.

Supply support for ADP2105-1.8-EVALZ 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision power, sensing, and conversion technologies.

The ADP2105-1.8-EVALZ belongs to Analog Devices' Power Management evaluation platform family, designed specifically to accelerate development of compact, high-efficiency point-of-load regulators for space-constrained, battery-powered, and thermally sensitive applications.

FAQ

What is the primary function of the ADP2105-1.8-EVALZ?

The ADP2105-1.8-EVALZ is a fully assembled and tested evaluation board that demonstrates the performance of the ADP2105-1.8 synchronous step-down DC-to-DC converter. It delivers a fixed 1.8 V output at up to 1 A, enabling engineers to validate efficiency, transient response, ripple, and regulation behavior without designing a custom PCB. The ADP2105-1.8-EVALZ includes all necessary passive components, layout-optimized power stages, and test points for immediate bench characterization.

Can the output voltage of the ADP2105-1.8-EVALZ be adjusted?

No-the ADP2105-1.8-EVALZ is configured exclusively for a fixed 1.8 V output. Its feedback network uses a 0 Ω resistor (R4) and omits R5 per the bill of materials, locking the regulation to the internal 0.8 V reference. To evaluate adjustable output configurations, users must select the ADP2105-EVAL instead. The ADP2105-1.8-EVALZ cannot be modified to change output voltage while maintaining guaranteed stability or performance specifications.

What are the key test points and connectors on the ADP2105-1.8-EVALZ?

The ADP2105-1.8-EVALZ provides dedicated screw-terminal-style headers for VIN, VOUT, GND (×2), EN, and J1 (enable jumper). Test points include LX (switch node), FB (feedback), SS (soft-start), and COMP (compensation). These allow direct oscilloscope probing of switching waveforms, output ripple, inductor current (via current probe), and loop stability analysis without soldering or board modification. The ADP2105-1.8-EVALZ schematic (Figure 9) documents exact locations and net assignments.

How does the ADP2105-1.8-EVALZ handle light-load efficiency?

The ADP2105-1.8-EVALZ leverages the ADP2105-1.8's automatic transition from PWM to PFM mode below ~10 mA load, reducing quiescent current to 20 µA and shutdown current to 0.1 µA. This preserves battery life in idle or sleep states. Measured PFM-mode ripple reaches up to 50 mV (vs. <20 mV in PWM), a known trade-off confirmed in Figure 4 of the evaluation board documentation. The ADP2105-1.8-EVALZ maintains regulation accuracy and fast wake-up response throughout the mode transition.

Is the ADP2105-1.8-EVALZ suitable for production use?

No-per Analog Devices' official disclaimer, the ADP2105-1.8-EVALZ is intended solely for device evaluation and not for production systems. It is supplied "as-is" without warranties of merchantability or fitness for purpose, and is explicitly prohibited for use in life-support devices or safety-critical applications. For production, designers must implement the ADP2105-1.8 IC on a custom PCB following layout guidelines, thermal design rules, and reliability validation outlined in the ADP2105-1.8 datasheet-not the ADP2105-1.8-EVALZ board itself.