Analog Devices Inc. ADP2108ACBZ-2.3-R7

Overview

ADP2108ACBZ-2.3-R7 from Analog Devices is a fixed-output 2.3 V, 600 mA synchronous step-down DC-DC converter with 3 MHz switching frequency, 18 μA quiescent current, and 2.3 V to 5.5 V input range. It integrates PFET/NFET power switches, internal compensation, soft start, and thermal/overcurrent protection-designed for space-constrained portable power rails in battery-powered devices.

For engineers reviewing the ADP2108ACBZ-2.3-R7 datasheet, ADP2108ACBZ-2.3-R7 pinout, ADP2108ACBZ-2.3-R7 application, or ADP2108ACBZ-2.3-R7 equivalent, key selection criteria include its 2.3 V fixed output, WLCSP-5 package footprint, 3 MHz constant-frequency PWM + power-save mode operation, and compatibility with single-cell Li+/LiPo or multi-cell alkaline/NiMH sources.

Technical Context

The ADP2108ACBZ-2.3-R7 employs a high-speed current-mode PWM architecture with automatic transition to hysteretic power-save mode below 80 mA load. Its 3 MHz fixed oscillator enables use of sub-1 µH inductors and 0603-size capacitors, minimizing solution size.

It features integrated 320 mΩ PFET and 300 mΩ NFET switches in the WLCSP-5 package, 100% duty-cycle low-dropout operation, undervoltage lockout (2.15 V fall threshold), and thermal shutdown at 150°C with 20°C hysteresis-ensuring robustness across −40°C to +125°C junction temperature range.

Key Specifications

Pinout & Package

ADP2108ACBZ-2.3-R7 is packaged in a 5-ball Wafer-Level Chip Scale Package (WLCSP) with 0.5 mm pitch and 1.0 mm × 1.0 mm footprint. The package is lead-free, RoHS-compliant, and optimized for minimal PCB area and thermal resistance (θ_JA = 105°C/W on JEDEC 2S2P board).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down converter applications.

Compared with TPS62231DRYR and RT8059GJ6, the ADP2108ACBZ-2.3-R7 offers the smallest PCB footprint (1.0 × 1.0 mm), lowest quiescent current (18 µA), and most tightly specified power-save mode transition (80 mA), making it optimal for ultra-compact, battery-sensitive designs where board space is premium.

Availability

ADP2108ACBZ-2.3-R7 is available at Aetrix Electronics and suitable for wireless handsets, portable media players, and GPS navigation units requiring stable component supply, long-term manufacturability, and guaranteed WLCSP-5 sourcing.

Supply support for ADP2108ACBZ-2.3-R7 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, headquartered in Norwood, MA.

The ADP2108 product line delivers compact, high-efficiency step-down converters for portable and battery-powered systems-designed to maximize runtime while minimizing PCB area and external component count.

FAQ

What is the output voltage tolerance of the ADP2108ACBZ-2.3-R7 over temperature and input voltage?

The ADP2108ACBZ-2.3-R7 guarantees ±2.5% output voltage accuracy across the full input range (2.3 V to 5.5 V) and operating junction temperature (−40°C to +125°C). This is achieved via factory-trimmed internal feedback and precision bandgap reference, eliminating need for external resistor calibration. The ADP2108ACBZ-2.3-R7 maintains this tolerance without external components.

Does the ADP2108ACBZ-2.3-R7 require external compensation components?

No, the ADP2108ACBZ-2.3-R7 features fully internal compensation-no external capacitors or resistors are needed for loop stability. This simplifies design, reduces BOM count, and ensures consistent performance across manufacturing lots. The internal compensation network is optimized for standard 0.7–3 µH inductors and 4.7–10 µF ceramic output capacitors used with the ADP2108ACBZ-2.3-R7.

How does the ADP2108ACBZ-2.3-R7 handle overload or short-circuit conditions?

The ADP2108ACBZ-2.3-R7 responds to overload or short-circuit by activating frequency foldback-reducing switching frequency to half (≈1.5 MHz) when FB voltage drops below 50% of target. This limits inductor current buildup and prevents thermal runaway. Combined with 1.1–1.5 A PFET peak current limit and thermal shutdown at 150°C, the ADP2108ACBZ-2.3-R7 provides robust fault recovery without latch-up or damage.

Can the ADP2108ACBZ-2.3-R7 operate with a 2.3 V input supply?

Yes, the ADP2108ACBZ-2.3-R7 supports VIN as low as 2.3 V-the same as its 2.3 V output-by entering 100% duty-cycle mode. In this state, the PFET remains continuously on, passing input directly to output with only R_DS(on) drop (320 mΩ typical). This enables operation down to end-of-charge battery voltages, extending usable runtime in single-cell Li+ systems.

What is the recommended PCB layout practice for the SW pin of the ADP2108ACBZ-2.3-R7?

The SW pin of the ADP2108ACBZ-2.3-R7 is a high dv/dt node connecting to the inductor. Layout best practices require: (1) shortest possible trace from SW ball to inductor pad, (2) no vias or stubs on the SW trace, (3) solid ground plane underneath with no splits, and (4) separation from sensitive analog traces (e.g., FB, EN). These measures minimize EMI and prevent coupling-induced instability in the ADP2108ACBZ-2.3-R7.