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

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics.

Note 2: The maximum power dissipation is a function of TJ(max) , θJA, and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJ(max)–TA)/θJA. All numbers apply for packages soldered directly into a PC board.

Note 3: For testing purposes, ESD was applied using human body model, 1.5kΩ in series with 100pF.

Block Diagram

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