LT1521IST-5#PBF-ND

300 mA Low Dropout Regulator with Micropower Quiescent Current and Shutdown

Product Description

Product Overview

The LT1521IST-5#PBF-ND is a high-performance 5 V fixed low dropout (LDO) linear regulator capable of delivering up to 300 mA of output current with a very low dropout voltage of approximately 0.5 V. Designed for battery-powered and portable applications, it features micropower operating current and an active shutdown mode for efficient energy management. The regulator maintains stable output with small ceramic capacitors and includes robust protection features for reliable operation in harsh environments.

Key Features

Fixed 5.0 V output voltage
Up to 300 mA output current
Low dropout voltage (~0.5 V at rated load)
Ultra-low quiescent current (~12 µA)
Shutdown mode with very low current (~6 µA)
Stable with small output capacitors (≥1.5 µF)
Reverse battery protection with no reverse output current
Thermal limiting and internal current limit
Excellent line and load regulation
SOT-223-3 surface mount package

Applications

Battery-powered systems
Portable and handheld electronics
Post-regulation for switching supplies
Precision analog power rails
Industrial control electronics
Telecom power supplies
Embedded processors and microcontroller systems

Electrical Characteristics

Parameter	Typical Value
Regulator Type	Low Dropout Linear Regulator
Output Voltage	5.0 V
Output Current	Up to 300 mA
Dropout Voltage	~ 0.5 V @ 300 mA
Quiescent Current	~ 12 µA
Shutdown Current	~ 6 µA
Supply Voltage Range	~4.3 V to 20 V
Stability	With Small Cap (≥ 1.5 µF)
Protection Features	Thermal / Current / Reverse Protection
Operating Temp.	–40 °C to +125 °C
Package Type	SOT-223-3
RoHS Compliance	RoHS Compliant