15 LM1117 (U175, U180, U181)
15.1 General description
The LM1117 is a series of low dropout voltage regulators with a dropout of 1.2V at 800mA
of load current. It has the same pin-out as National Semiconductor’s industry standard
LM317. The LM1117 is available in an adjustable version, which can set the output
voltage from 1.25V to 13.8V with only two external resistors. In addition, it is also
available in five fixed voltages, 1.8V, 2.5V, 2.85V, 3.3V, and 5V. The LM1117 offers
current limiting and thermal shutdown. Its circuit includes a zener trimmed bandgap
reference to as-sure output voltage accuracy to within ±1%. The LM1117 series is
available in SOT- 223, TO-220, and TO-252 D-PAK packages. A minimum of
10μF
tantalum capacitor is required at the output to improve the transient response and
stability.
15.2 Features
• Available in 1.8V, 2.5V, 2.85V, 3.3V, 5V, and Adjustable Versions
• Space Saving SOT-223 Package
• Current Limiting and Thermal Protection
• Output Current 800mA
• Line Regulation 0.2% (Max)
• Load Regulation 0.4% (Max)
• Temperature Range
• LM1117 0°C to 125°C
• LM1117I -40°C to 125°C
15.3 Applications
• 2.85V Model for SCSI-2 Active Termination
• Post Regulator for Switching DC/DC Converter
• High Efficiency Linear Regulators 15
• 32” TFT TV Service Manual 10/01/2005
• Battery Charger
• Battery Powered Instrumentation
15.4 Absolute maximum ratings
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