Analog Devices Inc. ADP2108AUJZ-1.3-R7

Overview

ADP2108AUJZ-1.3-R7 from Analog Devices is a fixed-output, 1.3 V synchronous step-down DC-DC converter optimized for portable battery-powered systems. It delivers up to 600 mA load current from 2.3 V–5.5 V input, operates at 3 MHz fixed frequency, achieves 95% peak efficiency, and features internal soft start, current-mode control, and 100% duty-cycle low-dropout mode - enabling use in wireless handsets and digital cameras.

For engineers reviewing the ADP2108AUJZ-1.3-R7 datasheet, ADP2108AUJZ-1.3-R7 pinout, ADP2108AUJZ-1.3-R7 application, or ADP2108AUJZ-1.3-R7 equivalent, key selection considerations include its 1.3 V fixed output, 5-ball WLCSP package, 18 μA quiescent current, power save mode transition at 80 mA, and integrated synchronous rectifier eliminating external diode requirements.

Technical Context

The ADP2108AUJZ-1.3-R7 implements a high-speed current-mode PWM architecture with automatic seamless transition to power save mode below 80 mA load. Its 3 MHz switching frequency enables ultra-compact designs using sub-1 μH inductors and 0603-size capacitors.

It integrates a PFET/NFET synchronous power stage (320 mΩ/300 mΩ on-resistance in WLCSP), internal compensation, undervoltage lockout (2.15 V fall threshold), thermal shutdown (150°C), and short-circuit protection via frequency foldback - all within a 1.0 mm × 1.0 mm, 0.5 mm height WLCSP package.

Key Specifications

Pinout & Package

ADP2108AUJZ-1.3-R7 is housed in a 1.0 mm × 1.0 mm, 0.5 mm height, 5-ball Wafer-Level Chip Scale Package (WLCSP) with bottom-side solder balls. The package supports fine-pitch PCB assembly and provides excellent 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 MAX17222ETA+T, ADP2108AUJZ-1.3-R7 offers the smallest footprint, highest current capability in its class, and unique 100% duty-cycle operation - making it optimal for space-constrained, single-cell battery systems demanding extended low-voltage runtime.

Availability

ADP2108AUJZ-1.3-R7 is available at Aetrix Electronics and suitable for wireless handsets, digital cameras, and portable media players requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.

Supply support for ADP2108AUJZ-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.

The ADP2108 series was designed specifically for ultra-compact, high-efficiency power conversion in portable consumer electronics - emphasizing minimal external component count, low quiescent current, and robust operation across wide input voltage and temperature ranges.

FAQ

What is the output voltage tolerance of the ADP2108AUJZ-1.3-R7 over temperature and line?

The ADP2108AUJZ-1.3-R7 guarantees ±2.5% output voltage accuracy across the full input range (2.3 V–5.5 V) and operating junction temperature (−40°C to +125°C). This specification is confirmed in Table 1 of the Rev. H datasheet under "Output Voltage Accuracy" with VIN = 2.3 V to 5.5 V, PWM mode. The fixed 1.3 V output is trimmed at wafer test and does not require external feedback components.

Does the ADP2108AUJZ-1.3-R7 support 100% duty-cycle operation, and what is its practical benefit?

Yes, the ADP2108AUJZ-1.3-R7 supports true 100% duty-cycle operation, allowing continuous conduction when input voltage approaches the output level. As documented in the "100% Duty Operation" section (Page 12), this enables regulation down to VIN ≈ 1.4 V while maintaining 1.3 V output - significantly extending usable battery life in single-cell Li+ systems before brownout.

What package type and dimensions does the ADP2108AUJZ-1.3-R7 use, and how is thermal performance characterized?

The ADP2108AUJZ-1.3-R7 uses a 5-ball WLCSP package measuring 1.0 mm × 1.0 mm × 0.5 mm (ball pitch: 0.4 mm). Its thermal resistance is θ_JA = 105°C/W on a JEDEC 2S2P PCB, per Table 3. This low value results from direct die-to-PCB conduction through solder balls and enables reliable 600 mA operation at +85°C ambient without forced airflow.

How does the ADP2108AUJZ-1.3-R7 manage light-load efficiency, and what triggers the mode transition?

The ADP2108AUJZ-1.3-R7 transitions automatically from PWM to power save mode at 80 mA load current (Table 1, "POWER SAVE MODE TO PWM CURRENT THRESHOLD"). In power save mode, it enters idle cycles to reduce switching losses, achieving >85% efficiency at 1 mA - critical for standby operation in portable devices. The transition is seamless and causes no output voltage discontinuity.

Is an external compensation network required for the ADP2108AUJZ-1.3-R7, and why?

No external compensation is required for the ADP2108AUJZ-1.3-R7. As stated in the "GENERAL DESCRIPTION" (Page 1) and "FEATURES" list, it includes internal compensation optimized for standard 0.7–3 μH inductors and 4.7–10 μF ceramic output capacitors. This eliminates loop-stability tuning effort and reduces design cycle time for compact, fixed-output applications.