深圳市勤思达科技有限公司

LM338K LM338K LM338K LM338K

Features

■ Guaranteed 7 A peak output current

■ Guaranteed 5 A output current

■ Adjustable output down to 1.2 V

■ Line regulation typically 0.005 %/V

■ Load regulation typically 0.1 %

■ Guaranteed thermal regulation

■ Current limit constant with temperature

■ Standard 3-lead transistor package

Description

The LM138, LM238, LM338 are adjustable 3-

terminal positive voltage regulators capable of

supplying in excess of 5 A over a 1.2 V to 32 V

output range. They are exceptionally easy to use

and require only 2 resistors to set the output

voltage. Careful circuit design has resulted in

outstanding load and line regulation comparable

to many commercial power supplies. The LM138

family is supplied in a standard 3-lead transistor

package.

The LM138, LM238, LM338 are packaged in

standard steel TO-3 transistor package. The

LM138 is rated for operation from - 55 °C to

150 °C, the LM238 from - 25 °C to 150 °C and the

LM338 from 0 °C to 125 °C.

A unique feature of the LM138 family is time-dependent

current limiting. The current limit circuitry

allows peak currents of up to 12 A to be drawn

from the regulator for short periods of time. This

allows the LM138 to be used with heavy transient

loads and speeds start-up under full-load

conditions. Under sustained loading conditions,

the current limit decreases to a safe value

protecting the regulator. Also included on the chip

are thermal overload protection and safe area

protection for the power transistor. Overload