Harman Kardon DVD 27, Service Manual

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LM1117/LM1117I
800mA Low-Dropout Linear Regulator
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 LLP, TO-263, 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
n
Available in 1.8V, 2.5V, 2.85V, 3.3V, 5V, and Adjustable
Versions
n
Space Saving SOT-223 and LLP Packages
n
Current Limiting and Thermal Protection
n
Output Current 800mA
n
Line Regulation 0.2% (Max)
n
Load Regulation 0.4% (Max)
n
Temperature Range
— LM1117 0˚C to 125˚C
— LM1117I −40˚C to 125˚C
Applications
n
2.85V Model for SCSI-2 Active Termination
n
Post Regulator for Switching DC/DC Converter
n
High Efficiency Linear Regulators
n
Battery Charger
n
Battery Powered Instrumentation
Typical Application
Active Terminator for SCSI-2 Bus
10091905
Fixed Output Regulator
10091928
October 2002
LM1
1
17/LM1
1
17I
800mA
Low-Dropout
Linear
Regulator
DVD27 harman/kardon
94