Analog Devices Inc. ADP2108ACBZ-1.8-R7

Overview

ADP2108ACBZ-1.8-R7 from Analog Devices is a fixed-output, 1.8 V, 600 mA synchronous step-down DC-DC converter with 3 MHz switching frequency, 2.3 V to 5.5 V input range, 95% peak efficiency, and internal soft start-designed for powering core logic in battery-powered portable electronics such as GPS navigation units and digital cameras.

For engineers reviewing the ADP2108ACBZ-1.8-R7 datasheet, ADP2108ACBZ-1.8-R7 pinout, ADP2108ACBZ-1.8-R7 application, or ADP2108ACBZ-1.8-R7 equivalent, key selection criteria include light-load efficiency (18 μA quiescent current), 100% duty cycle dropout mode, thermal shutdown (150°C), undervoltage lockout (2.15 V), and WLCSP-5 package compatibility with space-constrained PCB layouts.

Technical Context

The ADP2108ACBZ-1.8-R7 employs a high-speed current-mode PWM control architecture operating at a fixed 3 MHz frequency for fast line/load transient response and stable regulation across its 2.3 V–5.5 V input range. It integrates both PFET and NFET power switches with on-resistances of 320 mΩ and 300 mΩ respectively in the WLCSP package.

Under light loads (<80 mA), it transitions seamlessly into power save mode-reducing switching frequency and minimizing quiescent current to 18 μA-while maintaining output accuracy within ±2.5% over temperature and input voltage. Internal compensation and soft start eliminate external components beyond inductor and capacitors.

Key Specifications

Pinout & Package

ADP2108ACBZ-1.8-R7 is packaged in a 5-ball, 0.8 mm × 0.8 mm, 0.4 mm pitch Wafer-Level Chip Scale Package (WLCSP) optimized for minimal board area and thermal performance (θ_JA = 105°C/W).

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-1.8-R7 offers superior low-input-voltage capability (2.3 V min), smallest package volume (0.64 mm²), and tighter output accuracy (±2% vs. ±3%), making it optimal for space- and battery-limited portable designs where 1.8 V rail stability is critical.

Availability

ADP2108ACBZ-1.8-R7 is available at Aetrix Electronics and suitable for digital camera power management, GPS navigation unit core supply, and wireless handset baseband applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ADP2108ACBZ-1.8-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, with design centers worldwide and ISO 9001-certified manufacturing.

The ADP2108 product line delivers compact, high-efficiency step-down regulators for portable and battery-powered systems-emphasizing ultra-low quiescent current, small solution size, and robust protection features for consumer and industrial edge devices.

FAQ

What is the maximum output current capability of the ADP2108ACBZ-1.8-R7 across its full input voltage range?

The ADP2108ACBZ-1.8-R7 delivers up to 600 mA of continuous output current across its entire 2.3 V to 5.5 V input voltage range, verified per datasheet Table 1 under TJ = −40°C to +125°C. This rating holds regardless of input voltage, enabling consistent performance with single Li+/Li-poly, USB, or multi-cell alkaline supplies. Derating is not required unless ambient temperature exceeds +85°C or PCB thermal resistance exceeds JEDEC 2S2P standards.

Does the ADP2108ACBZ-1.8-R7 require external feedback resistors to set its output voltage?

No, the ADP2108ACBZ-1.8-R7 does not require external feedback resistors. It is a fixed-output variant with an internally trimmed 1.8 V reference connected directly to the FB pin. The FB terminal (Ball C2) is not user-accessible for adjustment-eliminating resistor tolerance errors, temperature drift, and layout sensitivity associated with adjustable regulators. This simplifies design and improves long-term output stability.

How does the ADP2108ACBZ-1.8-R7 manage efficiency at light loads, and what is its quiescent current?

The ADP2108ACBZ-1.8-R7 transitions automatically into power save mode below 80 mA load current, reducing switching frequency and lowering quiescent current to 18 μA typical (30 μA max). This preserves battery life in standby or intermittent-use applications. In shutdown (EN = low), it draws only 0.2 μA-verified across −40°C to +125°C-making it suitable for always-on subsystems in portable electronics.

What protection features are integrated into the ADP2108ACBZ-1.8-R7, and how do they operate?

The ADP2108ACBZ-1.8-R7 integrates undervoltage lockout (UVLO), thermal shutdown (150°C with 20°C hysteresis), current limiting (1100–1500 mA PFET peak), and short-circuit protection via frequency foldback. UVLO disables operation below 2.15 V to prevent battery damage; thermal shutdown halts switching until junction cools to 130°C; current limit prevents MOSFET overstress; and foldback reduces switching frequency during hard shorts to limit inductor discharge current.

Is the ADP2108ACBZ-1.8-R7 pin-compatible with other variants in the ADP2108 family, such as ADP2108ACBZ-3.3-R7?

Yes, all ADP2108 WLCSP-5 variants-including ADP2108ACBZ-1.8-R7, ADP2108ACBZ-3.3-R7, and ADP2108ACBZ-2.5-R7-share identical pinout, package dimensions (0.8 mm × 0.8 mm), and ball assignment (VIN, GND, SW, EN, FB). Only the internal feedback reference differs; no PCB layout change is needed when substituting fixed-output versions, provided input/output capacitor values remain appropriate for the new V_OUT.