VESTEL 17MB45-2, Service Manual

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11.10 LM1117
It is a regulator which is used for providing 1.8V from 3.3V for DVB side.
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.
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
Pin Configuration