Analog Devices Inc. ADP2108ACBZ-3.0-R7

Overview

ADP2108ACBZ-3.0-R7 from Analog Devices is a fixed-output, 3.0 V, 600 mA synchronous step-down DC-DC converter with 3 MHz switching frequency, 2.3 V to 5.5 V input range, and 95% peak efficiency. It integrates PFET/NFET power switches, internal compensation, soft start, and thermal/overcurrent protection - deployed in portable media players for battery-powered core rail regulation.

For engineers reviewing the ADP2108ACBZ-3.0-R7 datasheet, ADP2108ACBZ-3.0-R7 pinout, ADP2108ACBZ-3.0-R7 application, or ADP2108ACBZ-3.0-R7 equivalent, key selection criteria include light-load efficiency in power-save mode (80 mA threshold), WLCSP-5 package thermal resistance (105 °C/W), 100% duty-cycle dropout operation, and compatibility with 1 µH inductors and 4.7–10 µF ceramic output capacitors.

Technical Context

The ADP2108ACBZ-3.0-R7 uses a proprietary high-speed current-mode PWM control architecture operating at 3 MHz nominal frequency, enabling compact external components. Its dual-mode operation - fixed-frequency PWM above 80 mA load and hysteretic power-save mode below - ensures stable regulation while minimizing quiescent current (18 µA typical).

It implements integrated protection including undervoltage lockout (2.15 V falling threshold), thermal shutdown (150 °C with 20 °C hysteresis), and peak current limiting (1.3 A typical). The device supports 100% duty-cycle operation for low-dropout regulation and features internal soft start to limit inrush current during enable.

Key Specifications

Pinout & Package

ADP2108ACBZ-3.0-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. Thermal resistance θ_JA = 105 °C/W on JEDEC 2S2P PCB.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS62231DRYR and RT8059GJ6, the ADP2108ACBZ-3.0-R7 delivers superior thermal performance in ultra-compact form factor (1.0 × 1.0 mm), guaranteed 100% duty-cycle operation for extended battery life, and tightly specified 80 mA power-save transition threshold - making it optimal for space-constrained, battery-critical portable systems.

Availability

ADP2108ACBZ-3.0-R7 is available at Aetrix Electronics and suitable for portable media players, digital cameras, and wireless handsets requiring stable component supply with guaranteed long-term availability and consistent parametric performance.

Supply support for ADP2108ACBZ-3.0-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 ultra-compact, high-efficiency step-down regulators targeting battery-powered portable electronics where board space, thermal constraints, and standby power are critical design parameters.

FAQ

What is the output voltage tolerance of the ADP2108ACBZ-3.0-R7 under full load and temperature range?

The ADP2108ACBZ-3.0-R7 guarantees ±2.5% output voltage accuracy across its full operating junction temperature range (−40°C to +125°C) and input voltage range (2.3 V to 5.5 V) in PWM mode. At 25°C ambient and 3.6 V input, the typical deviation is ±2%, verified per Table 1 in the Rev. H datasheet. This tolerance includes line, load, and temperature effects without requiring external trimming.

Does the ADP2108ACBZ-3.0-R7 require external compensation components?

No, the ADP2108ACBZ-3.0-R7 features fully internal compensation - no external resistors or capacitors are needed for loop stability. This is confirmed in both the General Description and Features sections of the datasheet, and applies specifically to the fixed-output ADP2108ACBZ-3.0-R7 variant. The internal compensation network is optimized for standard 1 µH inductors and 4.7–10 µF ceramic output capacitors.

What is the minimum input voltage at which the ADP2108ACBZ-3.0-R7 maintains regulation before UVLO triggers?

The ADP2108ACBZ-3.0-R7 enters undervoltage lockout when input voltage falls below 2.05 V (typical) to 2.25 V (max) during VIN decay, per Table 1 Absolute Maximum Ratings. Regulation is maintained down to 2.3 V input - the lower limit of its operational input range - and UVLO prevents deep battery discharge by disabling switching below this threshold.

Can the ADP2108ACBZ-3.0-R7 operate with a 1.0 µH inductor, and what is the recommended DCR limit?

Yes, the ADP2108ACBZ-3.0-R7 is explicitly validated for 1.0 µH inductors (e.g., Murata LQM21PN1R0M), as listed in Table 6 of the datasheet. For optimal efficiency and thermal performance, the inductor's DC resistance should be ≤190 mΩ - matching the recommended part's DCR. Higher DCR increases conduction loss and reduces efficiency, especially at 600 mA load.

How does the ADP2108ACBZ-3.0-R7 handle short-circuit conditions on its output?

The ADP2108ACBZ-3.0-R7 employs frequency foldback protection: when FB voltage drops below 50% of target output (indicating hard short), switching frequency halves from 3 MHz to ~1.5 MHz. This extends off-time, allowing inductor current to decay safely and preventing runaway output current - detailed in the Short-Circuit Protection section (Page 12) of the Rev. H datasheet.