Texas Instruments TPS76518D

Overview

TPS76518D from Texas Instruments is a 1.8-V fixed-output, 150-mA ultra-low quiescent current LDO voltage regulator in an 8-pin SOIC package, featuring 35-µA typical ground current, 85-mV typical dropout at 150 mA (TPS76550 reference), and open-drain power-good output - designed for battery-powered portable electronics requiring long operating life and stable low-voltage rail generation.

For engineers reviewing the TPS76518D datasheet, TPS76518D pinout, TPS76518D application, or TPS76518D equivalent, key selection criteria include input voltage range (2.8 V to 10 V), ±3% output voltage tolerance over temperature and load, thermal shutdown protection, enable-controlled sleep mode (<1 µA standby), and compatibility with 4.7-µF output capacitors for stability.

Technical Context

The TPS76518D employs a PMOS pass transistor architecture, enabling ultra-low and load-independent quiescent current (35 µA typ) and linearly proportional dropout voltage. Its internal 1.224-V reference and error amplifier regulate output with 3% accuracy across –40°C to 125°C.

It integrates an open-drain power-good (PG) comparator with 92–98% VO trip threshold and hysteresis, plus thermal shutdown at 150°C and current limiting (~0.8 A). The EN pin supports TTL-compatible logic control (VIH ≥ 2.0 V, VIL ≤ 0.8 V) with ~160-µs startup time.

Key Specifications

Pinout & Package

TPS76518D is housed in an 8-pin SOIC (D) package with exposed pad not present; thermal resistance θJA = 176°C/W. Pin functions are validated per TI SLVS236 datasheet Figure D package top view and Terminal Functions table.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS76518D, TPS76518DR offers identical performance in tape-and-reel format for SMT lines, while MCP1700T-1802E/TT trades away PG functionality and higher dropout for significantly lower quiescent current - making it viable only in PG-optional, ultra-low-IQ systems.

Availability

TPS76518D is available at Aetrix Electronics and suitable for wearable health sensors, industrial IoT edge nodes, and portable medical diagnostic tools requiring stable component supply, long-term lifecycle support, and RoHS-compliant SOIC packaging.

Supply support for TPS76518D 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 leader delivering analog and embedded processing solutions, with core expertise in power management, signal chain, and microcontrollers.

The TPS765xx family was designed specifically for ultra-low-power, battery-operated portable electronics needing high accuracy, low dropout, and integrated power supervision - targeting medical, industrial, and consumer wearables.

FAQ

What is the minimum input voltage required for stable operation of the TPS76518D?

The TPS76518D requires a minimum input voltage of 2.8 V, which is defined as VO(typ) + 1 V (1.8 V + 1 V). This ensures sufficient headroom for regulation across temperature and load. Below 2.8 V, dropout behavior begins, and PG may assert; operation below 2.7 V is outside recommended conditions per datasheet Section 5.

Does the TPS76518D require an external pull-up resistor on the PG pin?

Yes, the TPS76518D PG pin is open-drain and requires an external pull-up resistor to a valid logic-high voltage (e.g., VIN or another regulated rail) to generate an active-high power-good signal. Without it, PG remains floating and cannot drive reset circuitry or microcontroller interrupts reliably.

Can the TPS76518D operate without any output load?

Yes, the TPS76518D is stable at zero load - no minimum load requirement exists. It maintains regulation and specified quiescent current (35 µA) even with no output current, making it ideal for intermittently active systems like wake-on-event sensors.

What capacitor types and values are recommended for the TPS76518D output?

The TPS76518D requires a minimum 4.7-µF output capacitor with ESR between 300 mΩ and 20 Ω. Solid tantalum, aluminum electrolytic, or multilayer ceramic capacitors meeting this ESR range are acceptable. A 4.7-µF X7R ceramic with ~100 mΩ ESR is commonly used for compact, low-ESR designs.

How does the enable (EN) pin affect quiescent current in the TPS76518D?

When EN is pulled low (≤0.8 V), the TPS76518D enters shutdown mode, reducing quiescent current to <1 µA (typ). This is critical for extending battery life in sleep states. When EN is high (≥2.0 V), normal regulation resumes with 35-µA typical ground current across all load conditions.