PRODUCT DESCRIPTION
The SPX1521 is a low power voltage regulator. This device is an excellent choice for use in battery-powered applications such as cordless telephones, radio control systems, and portable computers. The SPX1521 features very low quiescent current and very low dropout voltage. This includes a tight initial tolerance of ± 1% max, and very low output temperature coefficient, making the SPX1521 useful as a low-power voltage reference.
The error flag output feature is used as power-on reset for warning of a low output voltage, due to falling voltage input of batteries. The SPX1521 is offered in a SO-8, SOT-252, TO-223, TO-220 & TO-263 packages.

FEATURES
• 1% Output Accuracy @ 2.5V, 3.3V, 5V, @ 300mA Output
• Very Low Quiescent Current
• 0.42V (Typ.) Dropout Voltage @ 300mA
• Extremely Tight Load And Line Regulation
• Current & Thermal Limiting
• Logic-Controlled Electronic Shutdown
• Reverse Battery Protection
• Output Programmable From 1.24 To 20V
• Equivalent Replacement For LT1521

APPLICATIONS
• Battery Powered Systems
• Cordless Telephones
• Radio Control Systems
• Portable/Palm Top/Notebook Computers
• Portable Consumer Equipment
• Portable Instrumentation
• Bar Code Scanners
• SMPS Post-Regulator
• Voltage Reference
• Automotive Electronics