Analog Devices Inc. ADP1111ARZ-12-REEL

Overview

ADP1111ARZ-12-REEL from Analog Devices is a micropower, fixed-output step-up/step-down switching regulator delivering 12 V at up to 200 mA from a 12 V input in step-down mode or 100 mA from 3 V in step-up mode, with 72 kHz oscillator frequency, internal 1 A power switch, and operation across 2 V–30 V input range. It supports laptop power rails, flash memory VPP generation, and portable instrument supplies.

For engineers reviewing the ADP1111ARZ-12-REEL datasheet, ADP1111ARZ-12-REEL pinout, ADP1111ARZ-12-REEL application, or ADP1111ARZ-12-REEL equivalent, key selection criteria include its fixed 12 V output tolerance (±5%), programmable current limit via ILIM pin, low 300 μA quiescent current in shutdown, and dual-mode topology support without external compensation.

Technical Context

The ADP1111ARZ-12-REEL implements a gated-oscillator control architecture with a 1.25 V internal reference and comparator-based feedback loop, enabling stable regulation in boost, buck, or inverting configurations using only three external components. Its open-collector gain block (AO pin) supports low-battery detection or undervoltage lockout when configured with a resistor divider on the SET pin.

Switching is managed by an internal bipolar power transistor with accessible collector (SW1) and emitter (SW2) terminals, allowing direct connection to inductors and diodes for topology flexibility. Current limiting is set by a single resistor between ILIM and VIN, with factory-trimmed 400 mA default limit and –0.3%/°C temperature coefficient.

Key Specifications

Pinout & Package

ADP1111ARZ-12-REEL is housed in an 8-lead SOIC (SO-8) package with exposed pad for thermal enhancement. Pin functions are validated per Analog Devices ADP1111 Rev. A datasheet and confirmed on official product page.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADP1111ARZ-12-REEL, LT1931IS5-12 offers higher frequency and current but demands more complex filtering, while TPS61040DRVR trades fixed-voltage convenience for adjustable output and lower quiescent current - making ADP1111ARZ-12-REEL optimal for cost-sensitive, low-component-count 12 V rail generation.

Availability

ADP1111ARZ-12-REEL is available at Aetrix Electronics and suitable for flash memory VPP generation, portable instrument battery backup, and remote control power management requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.

Supply support for ADP1111ARZ-12-REEL 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, headquartered in Norwood, MA, with R&D and manufacturing operations worldwide.

The ADP1111 family was designed for ultra-low-power, multi-topology DC/DC conversion in portable and battery-critical systems - emphasizing micropower operation, minimal external components, and flexible voltage rail generation without external compensation.

FAQ

What is the output voltage tolerance of the ADP1111ARZ-12-REEL?

The ADP1111ARZ-12-REEL delivers a fixed 12.0 V output with ±5% tolerance over temperature and line conditions, as specified in the Rev. A datasheet Table "OUTPUT SENSE VOLTAGE" (11.40 V to 12.60 V). This tolerance is achieved via on-chip laser-trimmed resistors and does not require external calibration. The ADP1111ARZ-12-REEL maintains this accuracy across its full 0°C to +70°C operating range and 2 V–30 V input span.

Can the ADP1111ARZ-12-REEL operate in step-up mode from a 3 V input?

Yes, the ADP1111ARZ-12-REEL can operate in step-up mode from a 3 V input to deliver 12 V at up to 100 mA, as confirmed in the "GENERAL DESCRIPTION" section and Figure 1 (3 V to 5 V Step-Up Converter, extended to 12 V per application notes). Performance depends on inductor selection (e.g., 22 µH Sumida CD54-220K) and Schottky diode (e.g., MBRS120T3); efficiency drops at higher loads due to switch saturation voltage.

Does the ADP1111ARZ-12-REEL require external feedback resistors?

No, the ADP1111ARZ-12-REEL does not require external feedback resistors. As a fixed-output variant, it integrates laser-trimmed resistors internally connecting the FB/SENSE pin to the 1.25 V reference, setting the output precisely to 12 V. Per the PIN DESCRIPTIONS section, users simply connect the FB/SENSE pin directly to the output node - eliminating component count and layout variability inherent in adjustable regulators like the base ADP1111.

How is current limiting configured on the ADP1111ARZ-12-REEL?

Current limiting on the ADP1111ARZ-12-REEL is configured by connecting a resistor between the ILIM pin and VIN. A 220 Ω resistor sets the limit to 400 mA (typical), as shown in the "FEATURES" list and Figure 6 (Maximum Switch Current vs. RLIM). Leaving ILIM unconnected or tied directly to VIN enables the default 400 mA limit. The current limit has a –0.3%/°C temperature coefficient, ensuring predictable derating across the operating range.

What package type is used for the ADP1111ARZ-12-REEL?

The ADP1111ARZ-12-REEL uses an 8-lead plastic SOIC (SO-8) package, as explicitly stated in the "FEATURES" section and confirmed in the "PIN CONFIGURATIONS" diagram. It is RoHS-compliant and lead-free, with standard 1.27 mm pitch and exposed thermal pad. This package supports automated pick-and-place assembly and provides adequate thermal dissipation for continuous 200 mA step-down operation at ambient temperatures ≤50°C.