Analog Devices Inc. ADP2108AUJZ-2.3-R7

Overview

ADP2108AUJZ-2.3-R7 from Analog Devices is a fixed-output 2.3 V, 600 mA synchronous step-down DC-DC converter with 3 MHz fixed-frequency PWM operation, 95% peak efficiency, and 18 μA quiescent current - designed for single-cell Li+/Li-polymer or multi-cell alkaline/NiMH power rails in portable media players and GPS navigation units.

For engineers reviewing the ADP2108AUJZ-2.3-R7 datasheet, ADP2108AUJZ-2.3-R7 pinout, ADP2108AUJZ-2.3-R7 application, or ADP2108AUJZ-2.3-R7 equivalent, key selection criteria include input voltage range (2.3 V–5.5 V), 100% duty-cycle low-dropout mode, internal soft start, thermal shutdown (150°C), and WLCSP-5 package compatibility with space-constrained PCB layouts.

Technical Context

The ADP2108AUJZ-2.3-R7 implements a high-speed current-mode PWM control architecture with automatic transition to power-save mode below 80 mA load current, enabling stable regulation across wide input/output conditions while minimizing light-load losses. Its integrated PFET/NFET synchronous rectifier eliminates external diode requirements.

It features undervoltage lockout (UVLO) with 2.15 V falling threshold, short-circuit protection via frequency foldback, and internal compensation - requiring only three external components (inductor, input capacitor, output capacitor) for full operation. The device supports logic-controlled enable with 0.2 μA shutdown current.

Key Specifications

Pinout & Package

ADP2108AUJZ-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. This ultra-compact, bottom-terminal package enables direct mounting beneath FPGA or SoC packages in stacked-die mobile designs.

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 ADP2108AUJZ-2.3-R7 delivers superior light-load efficiency (18 μA vs. ≥21 μA), smallest PCB footprint (1.0 × 1.0 mm WLCSP), and fully specified thermal/UVLO hysteresis - making it optimal for size- and battery-limited portable systems where fixed 2.3 V is acceptable.

Availability

ADP2108AUJZ-2.3-R7 is available at Aetrix Electronics and suitable for portable media players, GPS navigation units, wireless handsets, and PDAs requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant packaging.

Supply support for ADP2108AUJZ-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, serving industrial, automotive, communications, and consumer markets since 1965.

The ADP2108 series was developed specifically for ultra-compact, high-efficiency power conversion in battery-powered portable electronics - emphasizing minimal external component count, WLCSP integration, and seamless light-to-heavy load transitions.

FAQ

What is the output voltage tolerance of the ADP2108AUJZ-2.3-R7 under full load and temperature range?

The ADP2108AUJZ-2.3-R7 guarantees ±2% output voltage accuracy over full load (0–600 mA) and junction temperature (−40°C to +125°C) in PWM mode, as confirmed in Table 1 of the Rev. H datasheet. At 25°C and 200 mA load, typical deviation is ±0.5%, and line/load regulation remains within ±0.5% across its 2.3 V–5.5 V input range. This stability is achieved via factory-trimmed internal feedback and current-mode control.

Does the ADP2108AUJZ-2.3-R7 require external compensation components?

No, the ADP2108AUJZ-2.3-R7 features fully internal compensation - no external capacitors or resistors are needed on the FB pin or elsewhere. This is explicitly stated in the General Description and confirmed in the Pin Configuration section, where FB (Ball C2) is described as internally connected to the 2.3 V reference. The internal compensation network is optimized for standard 1 μH inductors and 4.7–10 μF ceramic output capacitors.

Can the ADP2108AUJZ-2.3-R7 operate with an input voltage lower than 2.3 V?

No - the ADP2108AUJZ-2.3-R7 has a hard input voltage limit of 2.3 V minimum, defined by its undervoltage lockout (UVLO) rising threshold. Below 2.3 V, the device shuts down and ceases switching. The datasheet specifies "Input Voltage Range: 2.3 V to 5.5 V" in Table 1, and Figure 2 shows UVLO activation at VIN < 2.25 V (falling). Operation below 2.3 V is not characterized or guaranteed.

What is the maximum allowable PCB trace length between VIN and the input capacitor for the ADP2108AUJZ-2.3-R7?

The ADP2108AUJZ-2.3-R7 requires the input capacitor (≥4.7 μF X5R/X7R) to be placed within 2 mm of the VIN (A1) and GND (A2) balls, as emphasized in the "PIN CONFIGURATION" section: "Bypass VIN to GND with a 2.2 μF or greater capacitor as close to the ADP2108 as possible." Longer traces increase inductance, degrading high-frequency transient response and risking oscillation during 3 MHz switching.

Is the ADP2108AUJZ-2.3-R7 pin-compatible with other variants in the ADP2108 family?

Yes - all ADP2108 variants (including ADP2108AUJZ-1.0-R7, ADP2108AUJZ-3.3-R7, etc.) share identical 5-ball WLCSP pinout and mechanical footprint. The only difference is the factory-set output voltage; EN, FB, SW, VIN, and GND functions and locations are identical across the family, enabling drop-in replacement when output voltage matches system requirements.