1 Features

1• Output Current up to 1.5 A

• Available in Fixed 5-V, 12-V, and 15-V Options

• Output Voltage Tolerances of ±2% at TJ = 25°C

(LM340A)

• Line Regulation of 0.01% / V of at 1-A Load

(LM340A)

• Load Regulation of 0.3% / A (LM340A)

• Internal Thermal Overload, Short-Circuit and SOA

Protection

• Available in Space-Saving SOT-223 Package

• Output Capacitance Not Required for Stability

2 Applications

• Industrial Power Supplies

• SMPS Post Regulation

• HVAC Systems

• AC Inventors

• Test and Measurement Equipment

• Brushed and Brushless DC Motor Drivers

• Solar Energy String Invertors

3 Description

The LM340 and LM7805 Family monolithic 3-terminal

positive voltage regulators employ internal currentlimiting,

thermal shutdown and safe-area

compensation, making them essentially indestructible.

If adequate heat sinking is provided, they can deliver

over 1.5-A output current. They are intended as fixed

voltage regulators in a wide range of applications

including local (on-card) regulation for elimination of

noise and distribution problems associated with

single-point regulation. In addition to use as fixed

voltage regulators, these devices can be used with

external components to obtain adjustable output

voltages and currents.

Considerable effort was expended to make the entire

series of regulators easy to use and minimize the

number of external components. It is not necessary to

bypass the output, although this does improve

transient response. Input bypassing is needed only if

the regulator is located far from the filter capacitor of

the power supply.

LM7805 is also available in a higher accuracy and

better performance version (LM340A). Refer to

LM340A specifications in the LM340A Electrical

Characterisitcs table.