onsemi ILC7083AIM5ADJX

Overview

ILC7083AIM5ADJX from Fairchild Semiconductor is an adjustable-output 150mA low-dropout (LDO) voltage regulator in SOT-23-5 package, featuring 40µV_RMS output noise, 85dB ripple rejection at 1kHz, and ultra-low 1mV/mA dropout slope. It integrates ON/OFF control, thermal/overcurrent protection, and a dedicated V_ADJ pin for precision feedback-designed for RF-sensitive power rails in portable wireless systems.

For engineers reviewing the ILC7083AIM5ADJX datasheet, pinout, applications, or equivalent options, key selection criteria include its CMOS-based RF-LDO™ architecture, ceramic-capacitor compatibility, shutdown discharge capability (ILC7083-specific), and adjustable output range from 2.5V to 12V via external resistor divider.

Technical Context

The ILC7083AIM5ADJX employs a transconductance amplifier output stage with high-impedance current-source behavior, enabling stable operation with zero-ESR ceramic capacitors. Its internal pole-zero compensation scheme incorporates the output capacitor's pole into the stability loop rather than suppressing it-delivering exceptional line/load transient response without requiring tantalum capacitors.

Unlike the fixed-voltage ILC7083 variants, the ILC7083AIM5ADJX uses Pin 4 as V_ADJ (not C_NOISE) for feedback, with a precise 1.255V reference voltage (±3% over temperature). The device draws only 100–260µA ground current across 0–150mA load and achieves 500mA peak output current for burst-mode operation.

Key Specifications

Pinout & Package

SOT-23-5 surface-mount package with 0.95mm pitch, 1.45mm height, and exposed pad not present. Pin 1 = VIN, Pin 2 = GND, Pin 3 = ON/OFF, Pin 4 = V_ADJ, Pin 5 = V_OUT.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703T-3302E/MB and TSP50232DGKR, the ILC7083AIM5ADJX uniquely combines adjustable output, output discharge on shutdown, and industry-leading 40µV_RMS noise in a 5-pin SOT-23-making it optimal for RF-critical, battery-constrained portable systems requiring flexible voltage scaling and clean power sequencing.

Availability

ILC7083AIM5ADJX is available at Aetrix Electronics and suitable for cellular phone power management, wireless transceiver bias supply, PDA/handheld organizer systems, and battery-powered medical sensors requiring stable component supply across production lifecycles.

Supply support for ILC7083AIM5ADJX 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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and interface ICs before its acquisition by ON Semiconductor in 2016.

The ILC7083 series belongs to Fairchild's RF-LDO™ product line, engineered specifically for noise-sensitive wireless communications applications where low dropout, ceramic-capacitor compatibility, and fast transient response are essential.

FAQ

What is the maximum input voltage rating for the ILC7083AIM5ADJX?

The ILC7083AIM5ADJX has an absolute maximum input voltage of +13.5V. Operation is recommended within 2V to 13V per datasheet specifications. Exceeding 13.5V risks permanent damage due to internal junction breakdown, especially under high ambient temperature or sustained load conditions. Always verify input source regulation and transient suppression when designing with ILC7083AIM5ADJX in systems with unregulated inputs like batteries or rectified AC.

Does the ILC7083AIM5ADJX include output capacitor discharge during shutdown?

Yes, the ILC7083AIM5ADJX includes an active output capacitor discharge circuit activated when the ON/OFF pin is pulled below 0.6V. This feature rapidly pulls V_OUT to near-zero volts, enabling safe and deterministic power-down sequencing in portable systems. Unlike the ILC7084 series, this discharge function is inherent to all ILC7083 variants-including ILC7083AIM5ADJX-and is confirmed in the device's functional description and pin assignment tables.

What is the recommended output capacitor for stable operation of the ILC7083AIM5ADJX?

Fairchild specifies ≥1µF low-ESR ceramic capacitors for stable operation of the ILC7083AIM5ADJX. Recommended part numbers include Murata GRM40X7R105K010 (0805, 1µF, X7R) or Taiyo Yuden EMK316BJ105KL (1206, 1µF, X7R). Capacitors must be placed adjacent to Pins 2 (GND) and 5 (V_OUT) with minimal trace length. Tantalum capacitors are discouraged unless rated ≤0.4Ω ESR, as instability may occur with higher ESR values.

Can the ILC7083AIM5ADJX be used with a 1.2V output setting?

No-the ILC7083AIM5ADJX cannot reliably regulate at 1.2V. Its internal feedback reference is 1.255V ±3%, and the minimum output is constrained by this reference plus resistor-divider tolerance. Attempting 1.2V violates the 1.255V minimum reference requirement and results in regulation failure. Valid output range is 2.5V to 12V, as explicitly stated in the Adjustable Output Voltage section and confirmed by the V_ADJ equation V_OUT = 1.255V × (R1/R2 + 1).

How does the ILC7083AIM5ADJX achieve high ripple rejection without bipolar process technology?

The ILC7083AIM5ADJX achieves 85dB ripple rejection at 1kHz through its patented RF-LDO™ architecture: internal circuits (bandgap, error amplifier, transconductance stage) are powered from the regulated output-not raw input-creating inherent isolation. Combined with pole-zero compensation that leverages, rather than cancels, the output capacitor's pole, this design delivers bipolar-level noise immunity in a CMOS process. This is verified in the Electrical Characteristics table and Internal Block Diagram of the ILC7083AIM5ADJX datasheet.