Lm1117; General Description; Features; Applications - Hitachi 42PD3200A Service Manual

12.12. LM1117

12.12.1. 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.

12.12.2. 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

12.12.3. Applications

• 2.85V Model for SCSI-2 Active Termination
• Post Regulator for Switching DC/DC Converter
• High Efficiency Linear Regulators
• Battery Charger
• Battery Powered Instrumentation

12.12.4. Connection Diagrams

12.13. LM317

12.13.1. General Description
This monolithic integrated circuit is an adjustable 3-terminal positive voltage regulator designed to
supply more than 1.5A of load current with an output voltage adjustable over a 1.2 to 37V. It employs
internal current limiting, thermal shut-down and safe area compensation.
12.13.2. Features
• Output Current In Excess of 1.5A
• Output Adjustable Between 1.2V and 37V
• Internal Thermal Overload Protection
• Internal Short Circuit Current Limiting
• Output Transistor Safe Operating Area Compensation
• TO-220 Package
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