Texas Instruments LP2983AIM5X-1.2

Overview

LP2983AIM5X-1.2 from Texas Instruments is a micropower 150-mA low-dropout linear voltage regulator in SOT-23-5 package, delivering fixed 1.2 V output with ±1% accuracy (A-grade), stable operation with zero-ESR ceramic capacitors, and ON/OFF control for power sequencing in space-constrained portable electronics.

For engineers reviewing the LP2983AIM5X-1.2 datasheet, LP2983AIM5X-1.2 pinout, LP2983AIM5X-1.2 application, or LP2983AIM5X-1.2 equivalent, key selection criteria include dropout voltage margin at 150 mA, ground current vs. load behavior, thermal derating in SOT-23, ESR pin configuration for ceramic capacitor stability, and ON/OFF logic thresholds across −40°C to +125°C.

Technical Context

The LP2983AIM5X-1.2 uses a vertically integrated PNP pass transistor architecture enabling ultra-low ground current (75 µA at 1 mA, 825 µA at 150 mA) and inherent stability with ceramic output capacitors down to 0 Ω ESR. Its dedicated ESR pin (Pin 4) provides low-impedance return path for the output capacitor, decoupling feedback loop stability from PCB layout parasitics.

It integrates overtemperature shutdown and foldback current limiting (400 mA short-circuit, 250 mA peak), with ON/OFF control requiring ≥1.4 V (25°C) or ≥1.6 V (−40°C to +125°C) to enable regulation and ≤0.1 V (25°C) or ≤0.05 V (full range) to enter <12 µA shutdown mode - critical for battery-powered sleep-state integrity.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm height, gull-wing leads, exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-noise, micropower LDO applications.

Compared with TLC7L12QDCKRQ1 and TPS7A0512PDQNR, the LP2983AIM5X-1.2 uniquely guarantees stability with zero-ESR ceramics via its dedicated ESR pin and delivers tighter ±1% accuracy at full 150 mA load - making it the only option qualified for space-constrained, high-precision 1.2 V core rails demanding minimal external components.

Availability

LP2983AIM5X-1.2 is available at Aetrix Electronics and suitable for cellular phone baseband, wearable health sensor, industrial IoT edge node, and automotive cabin camera module applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for LP2983AIM5X-1.2 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

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and system-on-chip solutions for industrial, automotive, and personal electronics markets.

The LP2983 series was developed specifically for micropower, low-noise LDO applications in portable and battery-operated systems requiring high accuracy, ultra-low ground current, and compatibility with miniature ceramic capacitors - targeting design-in in space- and power-constrained edge devices.

FAQ

What is the minimum input voltage required for LP2983AIM5X-1.2 to maintain regulation at full 150 mA load?

The LP2983AIM5X-1.2 requires a minimum input voltage of 2.2 V to maintain regulation across its full operating temperature range (−40°C to +125°C) at 150 mA load. At 25°C, the minimum is 2.05 V. This corresponds to a dropout voltage of ~0.85 V at 150 mA - a key parameter for determining compatible upstream power sources such as DC/DC converters or battery cells.

How does the ESR pin (Pin 4) function in the LP2983AIM5X-1.2, and why can't it be tied to GND?

The ESR pin (Pin 4) in the LP2983AIM5X-1.2 serves as the dedicated low-impedance return path for the output capacitor's negative terminal - separating the capacitor's AC return current from the main GND pin (Pin 2). Tying ESR to GND would reintroduce ground noise into the feedback loop, compromising stability and PSRR. The datasheet mandates connection between OUT (Pin 5) and ESR (Pin 4) using a ceramic capacitor (≥2.2 µF), with ESR left floating from system GND.

What is the guaranteed output voltage accuracy of LP2983AIM5X-1.2 over temperature and load?

The LP2983AIM5X-1.2 is an A-grade device with guaranteed output voltage accuracy of ±1% at 1 mA–50 mA load and 25°C. Over the full −40°C to +125°C junction temperature range and 1 mA–150 mA load, accuracy degrades to ±2.5%. This specification is production-tested and ensured via Statistical Quality Control (SQC), making it suitable for precision analog supply rails where tight regulation is mandatory.

Can LP2983AIM5X-1.2 be used with Y5V or Z5U ceramic capacitors, and what is the minimum recommended value?

Yes, the LP2983AIM5X-1.2 supports Y5V and Z5U ceramic capacitors, but due to their high temperature-dependent capacitance loss (>50% drop from 25°C to 85°C), the minimum recommended value is 4.7 µF to ensure ≥2.2 µF remains at high temperature. For improved stability across temperature, X7R dielectric (±15% tolerance) is preferred - and a 2.2 µF X7R capacitor meets the minimum requirement without derating concerns.

What protection features are integrated into LP2983AIM5X-1.2, and how do they behave under fault conditions?

The LP2983AIM5X-1.2 integrates overtemperature shutdown and foldback current limiting. When junction temperature exceeds ~160°C, the device cycles on/off to limit average power dissipation. Under short-circuit, output current folds back from 250 mA peak to ~400 mA steady-state - reducing thermal stress. Both protections are fully internal, require no external components, and restore normal operation automatically once fault conditions subside.