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 assure 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

• Available in 1.8V, 2.5V, 2.85V, 3.3V, 5V, and Adjustable Versions

• Space Saving SOT-223 and LLP Packages

• 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

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

Typical Application

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.

Maximum Input Voltage (V_IN to GND)                                                                   20V

Power Dissipation (Note 2)                                                               Internally Limited

Junction Temperature (T_J) (Note 2)                                                                  150˚C

Storage Temperature Range                                                               -65˚C to 150˚C

Lead Temperature TO-220 (T) Package                                               260˚C, 10 sec

                              SOT-223 (IMP) Package                                           260˚C, 4 sec

ESD Tolerance (Note 3)                                                                                    2000V

Operating Ratings (Note 1)

Input Voltage (V_IN to GND)                                                   15V

Junction Temperature Range (T_J)(Note 2)

      LM1117                                                             0˚C to 125˚C

      LM1117I                                                        −40˚C to 125˚C

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