Analog Devices Inc. ADP7104ARDZ-1.5-R7

Overview

ADP7104ARDZ-1.5-R7 from Analog Devices is a 20 V input, 500 mA, low-noise CMOS LDO linear regulator with fixed 1.5 V output, 15 µV_rms output noise, 350 mV dropout at full load, and reverse current protection-designed for powering precision analog circuits such as ADCs, DACs, and clock buffers in industrial instrumentation systems.

For engineers reviewing the ADP7104ARDZ-1.5-R7 datasheet, ADP7104ARDZ-1.5-R7 pinout, ADP7104ARDZ-1.5-R7 application, or ADP7104ARDZ-1.5-R7 equivalent, key selection criteria include its ±0.8% initial accuracy, 60 dB PSRR at 10 kHz, programmable UVLO/enable, power-good indicator, and compatibility with 1 µF ceramic output capacitors in space-constrained designs.

Technical Context

The ADP7104ARDZ-1.5-R7 employs a PMOS pass transistor architecture enabling low dropout (350 mV @ 500 mA) and reverse current protection without external components. Its error amplifier compares a stable internal reference to the SENSE/ADJ node, delivering tight regulation across −40°C to +125°C junction temperature.

It integrates digital power-good monitoring with ±6.5% threshold hysteresis, user-programmable UVLO via resistor divider on EN/UVLO, and foldback current limiting (625–1000 mA). Thermal shutdown activates at 150°C with 15°C hysteresis, and ground current remains stable at 900 µA under full load at 10 V input.

Key Specifications

Pinout & Package

ADP7104ARDZ-1.5-R7 is housed in an 8-lead, 3 mm × 3 mm LFCSP package with exposed thermal pad (EPAD) electrically connected to GND. This compact, low-profile封装 delivers θ_JA = 40.1°C/W and superior thermal performance for 500 mA continuous operation in dense PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with LT3045EDD-1.5#PBF and TPL7407LADGKR, ADP7104ARDZ-1.5-R7 uniquely balances ultra-low noise (15 µV_rms), integrated power sequencing (PG + programmable UVLO), reverse current protection, and 1 µF capacitor stability-making it optimal for compact, high-integrity analog power domains.

Availability

ADP7104ARDZ-1.5-R7 is available at Aetrix Electronics and suitable for industrial instrumentation, medical patient monitoring, and communications infrastructure requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for ADP7104ARDZ-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 Wilmington, MA.

The ADP7104 product line was designed specifically for noise-sensitive analog and mixed-signal applications demanding high PSRR, ultra-low output noise, and robust power sequencing-targeting precision data acquisition, medical instrumentation, and high-frequency communication systems.

FAQ

What is the maximum input voltage rating for ADP7104ARDZ-1.5-R7?

The absolute maximum input voltage for ADP7104ARDZ-1.5-R7 is +22 V, but the recommended operating range is 3.3 V to 20 V. Operation above 20 V risks permanent damage even if within absolute maximum ratings, and thermal stress increases significantly above 16 V at full load. Always maintain ≥1 V headroom between VIN and VOUT for stable regulation.

Does ADP7104ARDZ-1.5-R7 require an external feedback resistor network?

No. ADP7104ARDZ-1.5-R7 is the fixed 1.5 V output variant and does not use the SENSE/ADJ pin for regulation. That pin is internally connected to the output and must be left unconnected or tied directly to VOUT per datasheet guidance. External resistors are only required for the adjustable version (ADP7104ARDZ-R7).

Can ADP7104ARDZ-1.5-R7 operate stably with less than 1 µF output capacitance?

No. The ADP7104ARDZ-1.5-R7 requires a minimum of 1 µF ceramic output capacitor (X5R/X7R dielectric) for guaranteed stability and transient response. Using smaller values may cause oscillation or excessive overshoot during load steps. The datasheet specifies 0.7 µF as absolute minimum under worst-case conditions-but 1 µF is the design target for all applications.

What is the function of the EPAD on ADP7104ARDZ-1.5-R7?

The EPAD (exposed thermal pad) on ADP7104ARDZ-1.5-R7 is electrically connected to GND and serves dual purposes: it provides a low-thermal-resistance path to the PCB ground plane (reducing θ_JA by ~15°C/W) and enhances EMI shielding. It must be soldered to a solid copper ground plane using ≥6 thermal vias; leaving it unconnected degrades thermal performance and may violate safety certifications.

How does the power-good (PG) pin behave during thermal shutdown of ADP7104ARDZ-1.5-R7?

During thermal shutdown, the PG pin of ADP7104ARDZ-1.5-R7 immediately transitions low (open-drain active-low assertion) as soon as the junction temperature reaches 150°C. This occurs independently of output voltage level and provides system-level fault indication before output collapse, enabling timely processor reset or fan activation. PG returns high only after thermal recovery and VOUT stabilization above 90% of 1.5 V.