Texas Instruments LP38692MPX-1.8/NOPB

Overview

LP38692MPX-1.8/NOPB from Texas Instruments is a 1-A, 1.8-V fixed-output low-dropout CMOS linear regulator in SOT-223-5 package, featuring 450 mV dropout at 1 A (V_OUT = 5 V), ±2.5% output accuracy at 25°C, and enable control with 0.4 V turn-off threshold-designed for powering core logic in battery-powered notebook computers and portable instrumentation.

For engineers reviewing the LP38692MPX-1.8/NOPB datasheet, LP38692MPX-1.8/NOPB pinout, LP38692MPX-1.8/NOPB application, or LP38692MPX-1.8/NOPB equivalent, key selection criteria include dropout voltage at 1.8 V output, EN pin logic thresholds across temperature, ground current stability under full load, ceramic capacitor compatibility down to 1 µF, and thermal performance in SOT-223 with R_θJA = 68.5°C/W.

Technical Context

The LP38692MPX-1.8/NOPB uses a PMOS pass transistor enabling ultra-low ground pin current (55 µA typical at full load) independent of input voltage or temperature. Its trimmed bandgap reference and feedback loop ensure 2.5% output accuracy over –40°C to 125°C, with foldback current limiting that scales from 450 mA (VIN–VOUT > 5 V) to 1500 mA (VIN–VOUT < 4 V).

It integrates thermal shutdown activation at 160°C (10°C hysteresis) and supports remote sensing via SNS pin in WSON variants-but the SOT-223-5 package (used by LP38692MPX-1.8/NOPB) omits SNS and DAP, relying on direct OUT connection and PCB copper for thermal management.

Key Specifications

Pinout & Package

SOT-223-5 package (6.50 mm × 3.56 mm body), thermally enhanced with exposed pad connected to GND internally; pin 2 is GND tab (primary thermal path), pin 4 is OUT, pin 5 is EN-no SNS or DAP terminals in this variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLS850F0TESA1 and TPS7A2018PDBVR, the LP38692MPX-1.8/NOPB uniquely balances 1-A output, 950-mV dropout at 1.8 V, and full industrial temperature guarantee-making it the only option among the three validated for sustained 1-A loads in portable instrumentation above 85°C ambient.

Availability

LP38692MPX-1.8/NOPB is available at Aetrix Electronics and suitable for notebook computers, portable instrumentation, and battery-powered test equipment requiring stable component supply, long-lifecycle support, and guaranteed industrial-temperature performance.

Supply support for LP38692MPX-1.8/NOPB 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 and embedded processing chips for industrial, automotive, and personal electronics markets.

The LP38692MPX-1.8/NOPB belongs to TI's LP3869x family of CMOS LDOs engineered for high-efficiency, low-noise power delivery in space-constrained, battery-sensitive applications-emphasizing ceramic capacitor compatibility and wide-input-voltage operation.

FAQ

What is the minimum input voltage required for LP38692MPX-1.8/NOPB to regulate 1.8 V at 1 A?

The LP38692MPX-1.8/NOPB requires VIN ≥ VOUT + VDO, where VDO is 950 mV maximum at 1 A and 1.8 V output. Thus, minimum VIN is 2.75 V. Below 2.7 V, internal circuitry becomes nonfunctional per datasheet Section 7.4.2-so 2.75 V is the practical lower bound for full-load regulation.

Does LP38692MPX-1.8/NOPB require an external pull-up resistor on the EN pin?

No. The LP38692MPX-1.8/NOPB EN pin has no internal pull-up or pull-down. It must be actively driven-either by a logic gate or via a resistor to IN (for always-on operation). Leaving EN floating risks undefined behavior; connecting EN directly to IN is a common, validated configuration per datasheet Section 7.3.1.

Can LP38692MPX-1.8/NOPB operate with a 1-µF ceramic output capacitor?

Yes. The LP38692MPX-1.8/NOPB is explicitly characterized and guaranteed stable with ≥1 µF ceramic capacitors (X7R/X5R), as confirmed in the "Features" and "Typical Applications" sections of the SNVS322M datasheet. No ESR range is required-unlike older LDOs-simplifying layout and BOM.

What is the thermal shutdown behavior of LP38692MPX-1.8/NOPB?

The LP38692MPX-1.8/NOPB activates thermal shutdown at ~160°C junction temperature and recovers at ~150°C (10°C hysteresis). As stated in Section 7.3.2, cycling indicates insufficient heatsinking-not fault tolerance. For SOT-223, maintain R_θJA ≤ 68.5°C/W via adequate GND copper area to avoid repeated shutdown under 1-A load.

Is the SNS pin available on LP38692MPX-1.8/NOPB?

No. The SNS (sense) pin is exclusive to WSON-6 package variants (e.g., LP38692MRX-1.8/NOPB). The LP38692MPX-1.8/NOPB uses the SOT-223-5 package, which has only IN, GND, OUT, and EN pins-per Pin Functions table in Section 5 of SNVS322M. Remote sensing is not supported in this variant.