Texas Instruments LP2983IM5X-1.2

Overview

LP2983IM5X-1.2 from Texas Instruments is a micropower 150-mA low-dropout linear voltage regulator in SOT-23-5 package, delivering a 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 LP2983IM5X-1.2 datasheet, LP2983IM5X-1.2 pinout, LP2983IM5X-1.2 application, or LP2983IM5X-1.2 equivalent, key selection criteria include dropout performance at 150 mA, ground current vs. load (75 µA at 1 mA, 825 µA at 150 mA), thermal shutdown behavior, ESR pin configuration for ceramic capacitor stability, and input voltage range (2.2 V to 16 V).

Technical Context

The LP2983IM5X-1.2 uses a vertically integrated PNP pass transistor architecture enabling ultra-low quiescent current and high PSRR (65 dB at 1 kHz). Its dedicated ESR pin (Pin 4) provides direct low-impedance return path for ceramic output capacitors, eliminating instability risks associated with near-zero ESR.

It integrates logic-level ON/OFF control (1.4 V turn-on threshold at 25°C), overtemperature and foldback current limiting (400 mA short-circuit, 250 mA peak), and operates across −40°C to +125°C junction temperature. Input-to-output reverse voltage protection requires external Schottky diode if V_OUT > V_IN.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm height, gull-wing leads, thermal pad not present. Pin 1 = IN, Pin 2 = GND, Pin 3 = ON/OFF, Pin 4 = ESR, Pin 5 = OUT.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLC7L12QDBVRQ1 and TPS7A0512PDBVR, the LP2983IM5X-1.2 uniquely combines A-grade accuracy, ON/OFF control, and ESR-pin stability in a 5-pin SOT-23 - making it optimal for portable systems needing precise, sequenced, ceramic-capable 1.2 V regulation.

Availability

LP2983IM5X-1.2 is available at Aetrix Electronics and suitable for cellular phone power management, wearable sensor node supply, industrial IoT edge controllers, and medical diagnostic handhelds requiring stable component supply across long production lifecycles.

Supply support for LP2983IM5X-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, specializing in analog, embedded processing, and power management technologies with broad industrial, automotive, and consumer design support.

The LP2983 product line delivers micropower, high-accuracy LDOs optimized for ≤1.2 V outputs in ultra-small packages - targeting battery-powered portable electronics where size, noise, and standby current are critical.

FAQ

What is the minimum input voltage required for LP2983IM5X-1.2 to maintain 1.2 V regulation?

The LP2983IM5X-1.2 requires VIN ≥ VOUT + 1 V for full-load regulation, so minimum input is 2.2 V at 25°C. At −40°C to +125°C, minimum VIN rises to 2.2 V per datasheet specifications. Below this, output voltage drops out of regulation, and dropout increases nonlinearly with load current.

How does the ESR pin (Pin 4) function in the LP2983IM5X-1.2 circuit?

The ESR pin in LP2983IM5X-1.2 provides a dedicated low-impedance return path for the ceramic output capacitor - it must be connected directly to the capacitor's ground terminal, not to system GND. This separates high-frequency AC return current from DC ground paths, ensuring stability even with 0 Ω ESR ceramic capacitors.

Can LP2983IM5X-1.2 be used without connecting the ON/OFF pin?

Yes - LP2983IM5X-1.2 can operate without external ON/OFF control by tying Pin 3 (ON/OFF) directly to VIN. This ensures permanent enable. Leaving the pin floating is not allowed; it must be actively terminated to avoid misoperation due to noise or leakage currents.

What output capacitor value and type are required for stable operation of LP2983IM5X-1.2?

LP2983IM5X-1.2 requires ≥2.2 µF ceramic capacitor connected between OUT (Pin 5) and ESR (Pin 4). X7R dielectric is preferred for temperature stability; Z5U/Y5V types require ≥4.7 µF to maintain ≥2.2 µF minimum capacitance across −40°C to +85°C. Tantalum or electrolytic capacitors are not recommended.

Does LP2983IM5X-1.2 include reverse input-output voltage protection?

No - LP2983IM5X-1.2 contains an inherent PNP collector-base diode that conducts if VOUT exceeds VIN by >0.7 V, risking latch-up. When reverse voltage is possible (e.g., hot-swap, backup battery), an external Schottky diode (cathode to IN, anode to OUT) is mandatory to limit reverse bias to <0.3 V per Absolute Maximum Ratings.