Analog Devices Inc. ADP2108ACBZ-1.2-R7

Overview

ADP2108ACBZ-1.2-R7 from Analog Devices is a fixed-output, 1.2 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 power switches, internal compensation, soft start, and thermal/overcurrent protection - designed for space-constrained portable power rails in battery-powered devices.

For engineers reviewing the ADP2108ACBZ-1.2-R7 datasheet, ADP2108ACBZ-1.2-R7 pinout, ADP2108ACBZ-1.2-R7 application, or ADP2108ACBZ-1.2-R7 equivalent, key selection criteria include its 1.2 V fixed output, WLCSP-5 package footprint, 18 μA quiescent current, 100% duty cycle low-dropout mode, and compatibility with tiny 0.7–3 μH inductors and 4.7–10 μF ceramic capacitors.

Technical Context

The ADP2108ACBZ-1.2-R7 employs a high-speed current-mode PWM control architecture operating at a fixed 3 MHz frequency for fast transient response and stable regulation across 2.3 V–5.5 V input. Its dual-mode operation-PWM at medium-to-heavy loads and power-save mode below ~80 mA-optimizes efficiency across the full 0–600 mA load range.

It integrates a PFET high-side switch (320 mΩ typical in WLCSP), NFET synchronous rectifier (300 mΩ), internal soft-start ramp, undervoltage lockout (2.15 V fall threshold), and thermal shutdown (150°C with 20°C hysteresis). The feedback loop is closed via the FB pin referenced to the 1.2 V output, with ±2% output voltage accuracy in PWM mode.

Key Specifications

Pinout & Package

ADP2108ACBZ-1.2-R7 is packaged in a 5-ball, 0.8 mm × 0.8 mm, 0.4 mm pitch Wafer-Level Chip Scale Package (WLCSP) with bottom-side solder balls. This ultra-compact, leadless package enables minimal PCB area usage and high-density layout in portable electronics.

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-1.2-R7 offers superior low-input-voltage support (down to 2.3 V), lower quiescent current (18 μA vs. ≥22 μA), and guaranteed 100% duty cycle operation - making it uniquely suited for single-cell Li+ systems nearing end-of-discharge.

Availability

ADP2108ACBZ-1.2-R7 is available at Aetrix Electronics and suitable for wireless handsets, portable media players, digital cameras, and PDA power management requiring stable component supply, long-lifecycle availability, and consistent WLCSP-5 packaging.

Supply support for ADP2108ACBZ-1.2-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 and manufacturing operations worldwide.

The ADP2108 series belongs to Analog Devices' precision, low-quiescent-current DC-DC converter product line, engineered specifically for battery-powered portable electronics demanding ultra-small size, high efficiency across light-to-heavy loads, and robust protection features.

FAQ

What is the output voltage tolerance of the ADP2108ACBZ-1.2-R7 under full load and temperature range?

The ADP2108ACBZ-1.2-R7 guarantees ±2.5% output voltage accuracy over the full input range (2.3 V–5.5 V) and junction temperature range (−40°C to +125°C) in PWM mode. At 25°C and nominal conditions, the tolerance tightens to ±2%, enabling reliable powering of 1.2 V core logic without external trimming. This specification is confirmed in Table 1 of the Rev. H datasheet.

Does the ADP2108ACBZ-1.2-R7 require external compensation components?

No, the ADP2108ACBZ-1.2-R7 features fully internal compensation. Its control loop is optimized for stability with standard 0.7–3 μH inductors and 4.7–10 μF ceramic output capacitors - eliminating external RC networks, saving PCB area, and removing tuning complexity. This is explicitly stated in the General Description and Applications Information sections of the datasheet.

Can the ADP2108ACBZ-1.2-R7 operate with input voltage below 2.3 V?

No - the ADP2108ACBZ-1.2-R7 has an absolute minimum input voltage of 2.3 V per Absolute Maximum Ratings and UVLO specifications. Below this, undervoltage lockout disables switching, and the device enters shutdown. However, its 100% duty cycle mode allows regulation down to VIN ≈ VOUT + dropout (typically ~1.3 V), but only when VIN remains ≥2.3 V.

What package type does the ADP2108ACBZ-1.2-R7 use, and is it RoHS compliant?

The ADP2108ACBZ-1.2-R7 uses a 5-ball WLCSP (Wafer-Level Chip Scale Package) with 0.4 mm pitch and Pb-free, RoHS-compliant terminations. This is confirmed in the Ordering Guide (Page 17, Rev. H) and Outline Dimensions (Page 16). The "CBZ" suffix in the part number denotes the WLCSP package variant.

How does the ADP2108ACBZ-1.2-R7 handle short-circuit conditions on the output?

The ADP2108ACBZ-1.2-R7 implements frequency foldback short-circuit protection: when FB voltage falls below 50% of target output (indicating hard short), switching frequency halves to allow inductor discharge and prevent current runaway. This behavior is documented in the Short-Circuit Protection section (Page 12) and verified in typical performance curves (Figure 16–21).