Analog Devices Inc. ADP2108ACBZ-1.3-R7

Overview

ADP2108ACBZ-1.3-R7 from Analog Devices is a fixed-output, 1.3 V synchronous step-down DC-DC converter delivering up to 600 mA from 2.3 V–5.5 V input, operating at 3 MHz with 95% peak efficiency and 18 μA quiescent current - deployed in portable media players, GPS units, and wireless handsets for battery-powered core logic regulation.

For engineers reviewing the ADP2108ACBZ-1.3-R7 datasheet, ADP2108ACBZ-1.3-R7 pinout, ADP2108ACBZ-1.3-R7 application, or ADP2108ACBZ-1.3-R7 equivalent, key selection considerations include its 1.3 V fixed output, WLCSP-5 package footprint, 3 MHz switching frequency, power save mode transition at 80 mA, and internal soft start/compensation eliminating external compensation networks.

Technical Context

The ADP2108ACBZ-1.3-R7 implements a high-speed current-mode PWM control architecture with automatic seamless transition to hysteretic power save mode below 80 mA load. Its 3 MHz fixed-frequency operation enables use of sub-1 µH inductors and 0603-sized capacitors, minimizing solution size.

It integrates a PFET/NFET synchronous power stage (320 mΩ/300 mΩ on-resistance in WLCSP), internal soft start, undervoltage lockout (2.15 V fall threshold), thermal shutdown (150°C with 20°C hysteresis), and 100% duty-cycle low-dropout mode - all optimized for single-cell Li+/Li-polymer and multi-cell alkaline/NiMH supply rails.

Key Specifications

Pinout & Package

ADP2108ACBZ-1.3-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 ultra-thin portable PCBs with minimal board area and thermal resistance (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 MAX17222ETA+T, the ADP2108ACBZ-1.3-R7 offers superior thermal performance (105°C/W), guaranteed 100% duty-cycle operation, and tighter power save mode hysteresis - making it optimal for thermally dense, battery-critical portable systems demanding full 600 mA capability across extended temperature ranges.

Availability

ADP2108ACBZ-1.3-R7 is available at Aetrix Electronics and suitable for portable media players, GPS navigation units, and wireless handsets requiring stable component supply with long-term lifecycle assurance and consistent parametric performance.

Supply support for ADP2108ACBZ-1.3-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, serving precision instrumentation, communications, and industrial markets since 1965.

The ADP2108 product line delivers ultra-compact, high-efficiency step-down regulators for battery-powered portable electronics - designed specifically to replace discrete buck solutions with minimal external components while maintaining robust thermal and transient performance.

FAQ

What is the output voltage tolerance of the ADP2108ACBZ-1.3-R7 over temperature and input voltage?

The ADP2108ACBZ-1.3-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 specification is verified per Table 1 in the Rev. H datasheet and reflects worst-case deviation including line, load, and temperature effects - ensuring reliable core logic regulation without external trimming.

Does the ADP2108ACBZ-1.3-R7 require external compensation components?

No, the ADP2108ACBZ-1.3-R7 features fully internal compensation optimized for stable 3 MHz operation with standard 0.7–1.0 µH inductors and 4.7–10 µF ceramic output capacitors. This eliminates external RC networks, reduces design risk, and accelerates time-to-market - confirmed in the General Description and Theory of Operation sections of the ADP2108 datasheet.

What package type is used for the ADP2108ACBZ-1.3-R7, and what are its thermal characteristics?

The ADP2108ACBZ-1.3-R7 uses a 5-ball WLCSP (0.8 mm × 0.8 mm, 0.4 mm pitch) with a junction-to-ambient thermal resistance (θ_JA) of 105°C/W on a JEDEC 2S2P PCB. This package enables ultra-thin profiles and superior thermal performance versus TSOT-5 alternatives - critical for thermally constrained handheld PCBs.

How does the ADP2108ACBZ-1.3-R7 handle low-load conditions to maintain efficiency?

The ADP2108ACBZ-1.3-R7 automatically transitions from fixed-frequency PWM mode to power save mode at ≤80 mA load, reducing switching frequency and entering idle cycles to achieve <1 µA effective quiescent current. This behavior is documented in Figure 9 and the Power Save Mode section of the datasheet, preserving battery life without compromising regulation stability.

Is the ADP2108ACBZ-1.3-R7 compatible with single-cell lithium polymer batteries?

Yes, the ADP2108ACBZ-1.3-R7 operates from 2.3 V to 5.5 V - fully supporting single-cell Li+/Li-polymer batteries (2.7–4.2 V nominal, 2.5–4.35 V operational range). Its 100% duty-cycle mode sustains 1.3 V output down to ~1.42 V input, enabling functional operation even at battery end-of-discharge.