TPS73618DBVT

Overview

The TPS73618DBVT is a low-dropout linear voltage regulator manufactured by Texas Instruments. It is part of the TPS736 series, known for their high performance in power management applications. This regulator delivers a fixed 1.8V output with a maximum dropout voltage of 180mV at 400mA load current, ensuring efficient operation even when the input voltage is close to the output level. Designed for portable and battery-powered devices, the TPS73618DBVT features low quiescent current (typically 75µA) and excellent transient response. Its small SOT-23-5 package makes it suitable for space-constrained applications such as IoT modules, wearables, and embedded systems.

Structure and Working Principle

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The TPS73618DBVT integrates a voltage reference, error amplifier, pass transistor, and protection circuits into a single chip. The error amplifier compares the output voltage (fed back via an internal divider) with a precise bandgap reference, adjusting the pass transistor to maintain a stable 1.8V output despite input voltage or load variations. Key internal components include thermal shutdown and overcurrent protection circuits, which safeguard the device from damage during fault conditions. The regulator operates with input voltages ranging from 2.2V to 5.5V, accommodating common power sources like lithium-ion batteries or 3.3V rails.

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Key Features

The TPS73618DBVT stands out for its ultra-low dropout voltage, which minimizes power loss and extends battery life in portable applications. Its output accuracy is ±1.5% over line, load, and temperature variations, ensuring reliable performance in diverse environments. Additional features include low output noise (typically 38µVRMS) without requiring an external noise-reduction capacitor, making it suitable for noise-sensitive analog circuits. The device also offers fast transient response to sudden load changes, critical for modern microprocessors and wireless communication modules.

Application Areas

This voltage regulator is widely used in portable electronics such as smartphones, tablets, and digital cameras where stable power is crucial for sensitive components. Its low quiescent current makes it ideal for always-on applications like real-time clocks and sensor hubs in IoT devices. Industrial applications include powering low-voltage microcontrollers, FPGAs, and ASICs in automation systems. Medical devices benefit from its reliability and small footprint, while automotive infotainment systems utilize its robust performance across temperature ranges.

Maintenance and Precautions

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深圳市巍拓科技有限公司

For optimal performance, maintain the input voltage within the specified 2.2V to 5.5V range and ensure proper PCB layout with adequate thermal vias when operating at high loads. Although the device includes thermal protection, continuous operation near maximum ratings may reduce lifespan. Avoid exposing the regulator to voltages exceeding 6V, which may cause permanent damage. When designing power supply circuits, place input and output capacitors as close as possible to the device pins to minimize parasitic inductance and improve stability.

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B2B Procurement Guide

When procuring TPS73618DBVT in bulk, verify authenticity through authorized distributors like Arrow Electronics or Avnet to avoid counterfeit components. Lead times typically range from 2-6 weeks for large orders, so plan inventory accordingly. Consider alternative part numbers (e.g., TPS73633DBVT for 3.3V output) if your application requires different voltage levels. For high-reliability applications, request factory certification or batch testing reports. Volume discounts are generally available for orders exceeding 1,000 units.