LM140K

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SNVS994 – JULY 2013

LM140K 3-Terminal Positive Regulator

Check for Samples: LM140K

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FEATURES

DESCRIPTION

The LM140K monolithic 3-terminal positive voltage

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Complete Specifications at 1A Load

regulator employs internal current-limiting, thermal

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Output Voltage Tolerances of ±4% at Tj = 25°C

shutdown and safe-area compensation, making them

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Internal Thermal Overload Protection

essentially indestructible. If adequate heat sinking is

provided, they can deliver over 1.0A output current.

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Internal Short-circuit Current Limit

They are intended as fixed voltage regulators in a

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Output Transistor Safe Area Protection

wide range of applications including local (on-card)

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P+ Product Enhancement Tested

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.

The LM140K is available in 5V, 12V and 15V options

in the steel TO-3 power package.

Typical Applications

*Required if the regulator is located far from

VOUT = 5V + (5V/R1 + IQ) R2 5V/R1 > 3 IQ,

the power supply filter.

load regulation (Lr) ≈ [(R1 + R2)/R1] (Lr of

**Although no output capacitor is needed

LM140K-5.0).

for stability, it does help transient response.

(If needed, use 0.1

μF, ceramic disc).

Figure 2. Adjustable Output Regulator

Figure 1. Fixed Output Regulator

ΔIQ = 1.3 mA over line and load changes.

Figure 3. Current Regulator

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PRODUCTION DATA information is current as of publication date.

Copyright © 2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.