Analog Devices Inc. ADP1706ARDZ-1.5-R7

Overview

ADP1706ARDZ-1.5-R7 from Analog Devices is a 1 A, low-dropout CMOS linear regulator with fixed 1.5 V output, operating from 2.5 V to 5.5 V input, delivering ±1% initial accuracy and 345 mV dropout at full 1 A load. It features logic-controlled enable, internal current limit (1.5 A typ), thermal shutdown (150°C), and stable operation with only 4.7 µF ceramic output capacitance - deployed in DSP/FPGA core supplies and memory power rails.

For engineers reviewing the ADP1706ARDZ-1.5-R7 datasheet, ADP1706ARDZ-1.5-R7 pinout, ADP1706ARDZ-1.5-R7 application, or ADP1706ARDZ-1.5-R7 equivalent, key selection considerations include its SOIC-8 exposed paddle package, soft-start programmability via SS pin, ±2.5% accuracy over line/load/temperature, and compatibility with compact PCB layouts requiring minimal external components.

Technical Context

The ADP1706ARDZ-1.5-R7 uses a PMOS pass transistor architecture with an internal 0.8 V reference and error amplifier feedback loop, enabling high PSRR (70 dB at 1 kHz for 0.75 V output) and fast load transient response. Its proprietary design achieves stable regulation with small ceramic capacitors while maintaining tight output voltage control across –40°C to +125°C junction temperature.

Unlike the ADP1707 (tracking) or ADP1708 (adjustable), the ADP1706ARDZ-1.5-R7 implements external soft start via capacitor on SS pin - allowing controlled ramp-up time (e.g., 7.3 ms with 10 nF), reducing inrush current and supporting voltage sequencing in multi-rail systems such as microprocessor core/I/O power domains.

Key Specifications

Pinout & Package

ADP1706ARDZ-1.5-R7 is housed in an 8-lead SOIC package with exposed thermal pad (RD-8-4), offering θ_JA = 58°C/W and direct GND connection via the EP for enhanced thermal performance in space-constrained industrial and computing applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-dropout linear regulator applications.

Compared with TSP50215DR and MCP1826-1502E/DB, ADP1706ARDZ-1.5-R7 uniquely combines SENSE-based remote regulation, SS-programmable soft start, and superior PSRR - making it the only option among the three qualified for high-accuracy, multi-rail, low-noise embedded computing applications.

Availability

ADP1706ARDZ-1.5-R7 is available at Aetrix Electronics and suitable for FPGA power delivery, DDR memory interfaces, and portable instrumentation requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for ADP1706ARDZ-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision power, data conversion, and RF technologies.

The ADP1706 series belongs to Analog Devices' precision low-dropout regulator product line, engineered specifically for high-current, low-noise, and thermally constrained applications in computing, memory, and portable electronics where reliability and accuracy are non-negotiable.

FAQ

What is the maximum input voltage for ADP1706ARDZ-1.5-R7?

The ADP1706ARDZ-1.5-R7 supports an absolute maximum input voltage of +6 V, but its operational input range is specified from 2.5 V to 5.5 V. Exceeding 5.5 V may cause permanent damage or violate Absolute Maximum Ratings per the Rev. C datasheet. For reliable 1.5 V output delivery, VIN must remain ≥1.85 V (1.5 V + 345 mV dropout) under 1 A load.

Does ADP1706ARDZ-1.5-R7 require an external capacitor on the SS pin?

ADP1706ARDZ-1.5-R7 does not require an external SS capacitor to operate - it functions normally with EN pulled high and no SS connection. However, connecting a capacitor (e.g., 10 nF) to SS enables programmable soft start (7.3 ms typical), which is essential for inrush control and voltage sequencing. Omitting the SS capacitor results in immediate turn-on with no ramp control.

Can ADP1706ARDZ-1.5-R7 be used with a 2.2 µF output capacitor?

No - ADP1706ARDZ-1.5-R7 requires a minimum 4.7 µF ceramic output capacitor for guaranteed stability, as confirmed in the Rev. C datasheet Section "Capacitor Selection". Using 2.2 µF risks oscillation, poor transient response, and potential output voltage overshoot or collapse under dynamic load conditions.

What is the thermal shutdown behavior of ADP1706ARDZ-1.5-R7?

ADP1706ARDZ-1.5-R7 triggers thermal shutdown at 150°C (typical) and remains off until junction temperature falls to ~135°C (15°C hysteresis). During sustained overload, this causes thermal oscillation - cycling between 1.5 A current limit and zero output - which protects the die but indicates inadequate PCB copper or excessive (VIN − VOUT) × ILOAD. Continuous operation must keep TJ ≤ 125°C.

Is the exposed pad (EP) of ADP1706ARDZ-1.5-R7 electrically connected?

Yes - the exposed pad (EP) of ADP1706ARDZ-1.5-R7 is internally connected to GND, as documented in Tables 4–6 of the Rev. C datasheet. It must be soldered to the PCB ground plane using adequate thermal vias to achieve the rated θ_JA = 58°C/W and prevent thermal shutdown under 1 A load. Leaving EP floating degrades thermal performance and risks reliability failure.