Analog Devices Inc. ADP2108ACBZ-1.5-R7

Overview

ADP2108ACBZ-1.5-R7 from Analog Devices is a fixed-output 1.5 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 operates in WLCSP-5 package for space-constrained portable power rails.

For engineers reviewing the ADP2108ACBZ-1.5-R7 datasheet, ADP2108ACBZ-1.5-R7 pinout, ADP2108ACBZ-1.5-R7 application, or ADP2108ACBZ-1.5-R7 equivalent, key selection considerations include its 1.5 V fixed output, 3 MHz current-mode control, 18 μA quiescent current, 100% duty cycle low-dropout mode, and thermal shutdown at 150°C.

Technical Context

The ADP2108ACBZ-1.5-R7 employs a high-speed current-mode PWM architecture with automatic transition to power save mode below 80 mA load. Its fixed 3 MHz oscillator enables compact external components - typically a 1 µH inductor and 4.7 µF/10 µF ceramic capacitors - while maintaining stable regulation across −40°C to +125°C junction temperature.

It features integrated undervoltage lockout (2.15 V falling threshold), 0.2 µA shutdown current, and dual protection: short-circuit frequency foldback and thermal shutdown with 20°C hysteresis. The device uses internal soft start to limit inrush current and supports 100% duty cycle operation for minimal dropout under heavy load or low VIN conditions.

Key Specifications

Pinout & Package

ADP2108ACBZ-1.5-R7 is packaged in a 5-ball Wafer-Level Chip Scale Package (WLCSP) with 0.4 mm pitch and 1.2 mm × 0.8 mm footprint. The package is lead-free, RoHS-compliant, and optimized for thin-profile portable PCBs.

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-1.5-R7 offers the smallest PCB footprint (1.2 × 0.8 mm), lowest quiescent current (18 μA), and integrated soft start - making it optimal for height- and battery-life-critical portable designs where WLCSP assembly capability exists.

Availability

ADP2108ACBZ-1.5-R7 is available at Aetrix Electronics and suitable for wireless handsets, portable media players, digital cameras, and PDAs requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.

Supply support for ADP2108ACBZ-1.5-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 dc-dc conversion for battery-powered portable electronics, emphasizing minimal external component count, ultra-low quiescent current, and robust thermal and protection features.

FAQ

What is the output voltage tolerance of the ADP2108ACBZ-1.5-R7 under full load and temperature range?

The ADP2108ACBZ-1.5-R7 guarantees ±2.5% output voltage accuracy across the full input range (2.3 V to 5.5 V) and junction temperature range (−40°C to +125°C) in PWM mode. At 25°C and nominal input, the typical deviation is ±2%, verified per Table 1 in the Rev. H datasheet. This tolerance ensures reliable operation of 1.5 V I/O domains in microcontrollers and sensors without external trimming.

Does the ADP2108ACBZ-1.5-R7 require external compensation components?

No, the ADP2108ACBZ-1.5-R7 features fully internal compensation, eliminating the need for external resistors or capacitors in the feedback loop. This simplifies design, reduces BOM count, and ensures stable operation with the recommended 1 µH inductor and 4.7 µF/10 µF ceramic capacitors. Compensation is factory-trimmed and validated across process, voltage, and temperature corners.

Can the ADP2108ACBZ-1.5-R7 operate with an input voltage lower than 2.3 V?

No - the ADP2108ACBZ-1.5-R7 has a hard undervoltage lockout (UVLO) threshold of 2.15 V (falling), and operation ceases below 2.3 V input. Attempting to operate below this risks unregulated output, increased ripple, or thermal stress. For sub-2.3 V inputs, consider the ADP2118 series or discrete LDO solutions with lower dropout.

What is the maximum allowable PCB temperature rise for continuous 600 mA operation in the WLCSP package?

With the ADP2108ACBZ-1.5-R7 in 5-ball WLCSP (θJA = 105°C/W), continuous 600 mA operation at 3.6 V input and 1.5 V output yields ~1.26 W power dissipation. To keep junction temperature ≤125°C at 85°C ambient, the PCB must limit temperature rise to ≤40°C - achievable with ≥200 mm² of 1 oz copper thermal pad connected to all five balls via multiple vias.

Is the ADP2108ACBZ-1.5-R7 pin-compatible with other ADP2108 fixed-output variants?

Yes - all ADP2108 fixed-output versions (including ADP2108ACBZ-1.5-R7, ADP2108ACBZ-1.8-R7, etc.) share identical WLCSP-5 pinout, package dimensions, and electrical interface. Only the internal feedback divider differs; no PCB redesign is needed when changing output voltage variants, provided external components meet each version's stability requirements.