LM317MDTNOPB National Semiconductor, LM317MDTNOPB Datasheet

LM317MDTNOPB

Manufacturer Part Number

LM317MDTNOPB

Description

TO-252

Manufacturer

National Semiconductor

Datasheet

1.LM317MDTNOPB.pdf (26 pages)

Specifications of LM317MDTNOPB

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LM117/LM317A/LM317

3-Terminal Adjustable Regulator

General Description

The LM117 series of adjustable 3-terminal positive voltage

regulators is capable of supplying in excess of 1.5A over a

1.2V to 37V output range. They are exceptionally easy to use

and require only two external resistors to set the output volt-

age. Further, both line and load regulation are better than

standard fixed regulators. Also, the LM117 is packaged in

standard transistor packages which are easily mounted and

handled.

In addition to higher performance than fixed regulators, the

LM117 series offers full overload protection available only in

IC's. Included on the chip are current limit, thermal overload

protection and safe area protection. All overload protection

circuitry remains fully functional even if the adjustment termi-

nal is disconnected.

Normally, no capacitors are needed unless the device is sit-

uated more than 6 inches from the input filter capacitors in

which case an input bypass is needed. An optional output ca-

pacitor can be added to improve transient response. The

adjustment terminal can be bypassed to achieve very high

ripple rejection ratios which are difficult to achieve with stan-

dard 3-terminal regulators.

Besides replacing fixed regulators, the LM117 is useful in a

wide variety of other applications. Since the regulator is “float-

ing” and sees only the input-to-output differential voltage,

supplies of several hundred volts can be regulated as long as

Typical Applications

Full output current not available at high input-output voltages

of 1μF to 1000μF of aluminum or tantalum electrolytic are commonly used

to provide improved output impedance and rejection of transients.

*Needed if device is more than 6 inches from filter capacitors.

†Optional—improves transient response. Output capacitors in the range

1.2V–25V Adjustable Regulator

9063

906301

the maximum input to output differential is not exceeded, i.e.,

avoid short-circuiting the output.

Also, it makes an especially simple adjustable switching reg-

ulator, a programmable output regulator, or by connecting a

fixed resistor between the adjustment pin and output, the

LM117 can be used as a precision current regulator. Supplies

with electronic shutdown can be achieved by clamping the

adjustment terminal to ground which programs the output to

1.2V where most loads draw little current.

For applications requiring greater output current, see LM150

series (3A) and LM138 series (5A) data sheets. For the neg-

ative complement, see LM137 series data sheet.

Features

■

SOT-223 vs. TO-252 (D-Pak)

Packages

LM117, LM317A, LM317

Guaranteed 1% output voltage tolerance (LM317A)

Guaranteed max. 0.01%/V line regulation (LM317A)

Guaranteed max. 0.3% load regulation (LM117)

Guaranteed 1.5A output current

Adjustable output down to 1.2V

Current limit constant with temperature

80 dB ripple rejection

Output is short-circuit protected

LM317A, LM317

Product Enhancement tested

LM117, LM317

LM117/LM317A/LM317 Package Options

Number

LM317

LM117

Part

Scale 1:1

Suffix

EMP

MDT

Package

SOT-223

TO-220

TO-263

TO-252

TO-39

TO-3

LCC

906354

www.national.com

April 2007

Current

Output

1.5A

1.0A

0.5A

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