LM117KRQMLX - Texas Instruments High-Performance Analog

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

voltage. 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 ter-

minal is disconnected.

Normally, no capacitors are needed unless the device is

situated more than 6 inches from the input filter capacitors in

which case an input bypass is needed. An optional output

capacitor 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

“floating” and sees only the input-to-output differential volt-

age, supplies of several hundred volts can be regulated as

long as the maximum input to output differential is not ex-

ceeded, i.e., avoid short-circuiting the output.

Also, it makes an especially simple adjustable switching

regulator, 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. Sup-

plies with electronic shutdown can be achieved by clamping

the adjustment terminal to ground which programs the out-

put 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

negative complement, see LM137 series data sheet.

Features

nGuaranteed 1% output voltage tolerance (LM317A)

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

nGuaranteed max. 0.3% load regulation (LM117)

nGuaranteed 1.5A output current

nAdjustable output down to 1.2V

nCurrent limit constant with temperature

Product Enhancement tested

n80 dB ripple rejection

nOutput is short-circuit protected

Typical Applications

1.2V–25V Adjustable Regulator

00906301

Full output current not available at high input-output voltages

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

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

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

used to provide improved output impedance and rejection of transients.

LM117 Series Packages

Part Number Design

Suffix Package Load

Current

K TO-3 1.5A

H TO-39 0.5A

T TO-220 1.5A

E LCC 0.5A

S TO-263 1.5A

EMP SOT-223 1A

MDT TO-252 0.5A

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

Packages

00906354

Scale 1:1

May 2001

LM117/LM317A/LM317 3-Terminal Adjustable Regulator

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Power Dissipation Internally Limited

Input-Output Voltage Differential +40V, −0.3V

Storage Temperature −65˚C to +150˚C

Lead Temperature

Metal Package (Soldering, 10 seconds) 300˚C

Plastic Package (Soldering, 4 seconds) 260˚C

ESD Tolerance (Note 5) 3 kV

Operating Temperature Range

LM117 −55˚C ≤T

≤+150˚C

LM317A −40˚C ≤T

≤+125˚C

LM317 0˚C ≤T

≤+125˚C

Preconditioning

Thermal Limit Burn-In All Devices 100%

Electrical Characteristics (Note 3)

Specifications with standard type face are for T

= 25˚C, and those with boldface type apply over full Operating Tempera-

ture Range. Unless otherwise specified, V

−V

OUT

= 5V, and I

OUT

= 10 mA.

Parameter Conditions LM117 (Note 2) Units

Min Typ Max

Reference Voltage V

3V ≤(V

−V

OUT

)≤40V, 1.20 1.25 1.30 V

10 mA ≤I

OUT

≤I

MAX

,P≤P

MAX

Line Regulation 3V ≤(V

−V

OUT

)≤40V (Note 4) 0.01 0.02 %/V

0.02 0.05 %/V

Load Regulation 10 mA ≤I

OUT

≤I

MAX

(Note 4) 0.1 0.3 %

0.3 1 %

Thermal Regulation 20 ms Pulse 0.03 0.07 %/W

Adjustment Pin Current 50 100 µA

Adjustment Pin Current Change 10 mA ≤I

OUT

≤I

MAX

0.2 5 µA

3V ≤(V

−V

OUT

)≤40V

Temperature Stability T

MIN

≤T

MAX

Minimum Load Current (V

−V

OUT

) = 40V 3.5 5 mA

Current Limit (V

−V

OUT

)≤15V

K Package 1.5 2.2 3.4 A

H Packages 0.5 0.8 1.8 A

−V

OUT

) = 40V

K Package 0.3 0.4 A

H Package 0.15 0.2 A

RMS Output Noise, % of V

OUT

10 Hz ≤f≤10 kHz 0.003 %

Ripple Rejection Ratio V

OUT

= 10V, f = 120 Hz, 65 dB

ADJ

=0µF

OUT

= 10V, f = 120 Hz, 66 80 dB

ADJ

=10µF

Long-Term Stability T

= 125˚C, 1000 hrs 0.3 1 %

Thermal Resistance, K Package 2.3 3 ˚C/W

Junction-to-Case H Package 12 15 ˚C/W

E Package ˚C/W

Thermal Resistance, Junction- K Package 35 ˚C/W

to-Ambient (No Heat Sink) H Package 140 ˚C/W

E Package ˚C/W

LM117/LM317A/LM317

www.national.com 2

Electrical Characteristics (Note 3)

Specifications with standard type face are for T

= 25˚C, and those with boldface type apply over full Operating Tempera-

ture Range. Unless otherwise specified, V

−V

OUT

= 5V, and I

OUT

= 10 mA.

Parameter Conditions LM317A LM317 Units

Min Typ Max Min Typ Max

Reference Voltage 1.238 1.250 1.262 V

3V ≤(V

−V

OUT

)≤40V, 1.225 1.250 1.270 1.20 1.25 1.30 V

10 mA ≤I

OUT

≤I

MAX

,P≤P

MAX

Line Regulation 3V ≤(V

−V

OUT

)≤40V (Note 4) 0.005 0.01 0.01 0.04 %/V

0.01 0.02 0.02 0.07 %/V

Load Regulation 10 mA ≤I

OUT

≤I

MAX

(Note 4) 0.1 0.5 0.1 0.5 %

0.3 1 0.3 1.5 %

Thermal Regulation 20 ms Pulse 0.04 0.07 0.04 0.07 %/W

Adjustment Pin Current 50 100 50 100 µA

Adjustment Pin Current

Change 10 mA ≤I

OUT

≤I

MAX

0.2 5 0.2 5 µA

3V ≤(V

−V

OUT

)≤40V

Temperature Stability T

MIN

≤T

MAX

11%

Minimum Load Current (V

−V

OUT

) = 40V 3.5 10 3.5 10 mA

Current Limit (V

−V

OUT

)≤15V

K, T, S Packages 1.5 2.2 3.4 1.5 2.2 3.4 A

H Package

MP Package 0.5

1.5 0.8

2.2 1.8

3.4 0.5

1.5 0.8

2.2 1.8

3.4 A

−V

OUT

) = 40V

K, T, S Packages 0.15 0.4 0.15 0.4 A

H Package

MP Package 0.075

0.55 0.2

0.4 0.075

0.15 0.2

0.4 A

RMS Output Noise, % of V

OUT

10 Hz ≤f≤10 kHz 0.003 0.003 %

Ripple Rejection Ratio V

OUT

= 10V, f = 120 Hz, 65 65 dB

ADJ

=0µF

OUT

= 10V, f = 120 Hz, 66 80 66 80 dB

ADJ

=10µF

Long-Term Stability T

= 125˚C, 1000 hrs 0.3 1 0.3 1 %

Thermal Resistance,

Junction-to-Case K Package

MDT Package 2.3

53 ˚C/W

˚C/W

H Package 12 15 12 15 ˚C/W

T Package

MP Package 4

23.5 54

23.5 ˚C/W

˚C/W

Thermal Resistance,

Junction-to-Ambient (No Heat

Sink)

K Package

MDT Package(Note 6) 35 35

92 ˚C/W

˚C/W

H Package 140 140 ˚C/W

T Package 50 50 ˚C/W

S Package (Note 6) 50 50 ˚C/W

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 do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The

guaranteed specifications apply only for the test conditions listed.

Note 2: Refer to RETS117H drawing for the LM117H, or the RETS117K for the LM117K military specifications.

Note 3: Although power dissipation is internally limited, these specifications are applicable for maximum power dissipations of 2W for the TO-39 and SOT-223 and

20W for the TO-3, TO-220, and TO-263. IMAX is 1.5A for the TO-3, TO-220, and TO-263 packages, 0.5A for the TO-39 package and 1A for the SOT-223 Package.

All limits (i.e., the numbers in the Min. and Max. columns) are guaranteed to National’s AOQL (Average Outgoing Quality Level).

Note 4: Regulation is measured at a constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are

covered under the specifications for thermal regulation.

Note 5: Human body model, 100 pF discharged through a 1.5 kΩresistor.

Note 6: If the TO-263 or TO-252 packages are used, the thermal resistance can be reduced by increasing the PC board copper area thermally connected to the

package. Using 0.5 square inches of copper area. θJA is 50˚C/W; with 1 square inch of copper area, θJA is 37˚C/W; and with 1.6 or more square inches of copper

area, θJA is 32˚C/W. If the SOT-223 package is used, the thermal resistance can be reduced by increasing the PC board copper area (see applications hints for

heatsinking).

LM117/LM317A/LM317

www.national.com3

Output Capacitor = 0 µF unless otherwise noted

Typical Performance Characteristics

Load Regulation Current Limit

00906337 00906338

Adjustment Current Dropout Voltage

00906339 00906340

Temperature Stability Minimum Operating Current

00906341 00906342

LM117/LM317A/LM317

www.national.com 4

Typical Performance Characteristics (Continued)

Ripple Rejection Ripple Rejection

00906343 00906344

Ripple Rejection Output Impedance

00906345 00906346

Line Transient Response Load Transient Response

00906347 00906348

LM117/LM317A/LM317

www.national.com5

Application Hints

In operation, the LM117 develops a nominal 1.25V reference

voltage, V

REF

, between the output and adjustment terminal.

The reference voltage is impressed across program resistor

R1 and, since the voltage is constant, a constant current I

then flows through the output set resistor R2, giving an

output voltage of

Since the 100 µA current from the adjustment terminal rep-

resents an error term, the LM117 was designed to minimize

ADJ

and make it very constant with line and load changes.

To do this, all quiescent operating current is returned to the

output establishing a minimum load current requirement. If

there is insufficient load on the output, the output will rise.

External Capacitors

An input bypass capacitor is recommended. A 0.1 µF disc or

1 µF solid tantalum on the input is suitable input bypassing

for almost all applications. The device is more sensitive to

the absence of input bypassing when adjustment or output

capacitors are used but the above values will eliminate the

possibility of problems.

The adjustment terminal can be bypassed to ground on the

LM117 to improve ripple rejection. This bypass capacitor

prevents ripple from being amplified as the output voltage is

increased. With a 10 µF bypass capacitor 80 dB ripple re-

jection is obtainable at any output level. Increases over

10 µF do not appreciably improve the ripple rejection at

frequencies above 120 Hz. If the bypass capacitor is used, it

is sometimes necessary to include protection diodes to pre-

vent the capacitor from discharging through internal low

current paths and damaging the device.

In general, the best type of capacitors to use is solid tanta-

lum. Solid tantalum capacitors have low impedance even at

high frequencies. Depending upon capacitor construction, it

takes about 25 µF in aluminum electrolytic to equal 1 µF

solid tantalum at high frequencies. Ceramic capacitors are

also good at high frequencies; but some types have a large

decrease in capacitance at frequencies around 0.5 MHz. For

this reason, 0.01 µF disc may seem to work better than a 0.1

µF disc as a bypass.

Although the LM117 is stable with no output capacitors, like

any feedback circuit, certain values of external capacitance

can cause excessive ringing. This occurs with values be-

tween 500 pF and 5000 pF. A 1 µF solid tantalum (or 25 µF

aluminum electrolytic) on the output swamps this effect and

insures stability. Any increase of the load capacitance larger

than 10 µF will merely improve the loop stability and output

impedance.

Load Regulation

The LM117 is capable of providing extremely good load

regulation but a few precautions are needed to obtain maxi-

mum performance. The current set resistor connected be-

tween the adjustment terminal and the output terminal (usu-

ally 240Ω) should be tied directly to the output (case) of the

regulator rather than near the load. This eliminates line

drops from appearing effectively in series with the reference

and degrading regulation. For example, a 15V regulator with

0.05Ωresistance between the regulator and load will have a

load regulation due to line resistance of 0.05ΩxI

. If the set

resistor is connected near the load the effective line resis-

tance will be 0.05Ω(1 + R2/R1) or in this case, 11.5 times

worse.

Figure 2

shows the effect of resistance between the regula-

tor and 240Ωset resistor.

With the TO-3 package, it is easy to minimize the resistance

from the case to the set resistor, by using two separate leads

to the case. However, with the TO-39 package, care should

be taken to minimize the wire length of the output lead. The

ground of R2 can be returned near the ground of the load to

provide remote ground sensing and improve load regulation.

Protection Diodes

When external capacitors are used with

any

IC regulator it is

sometimes necessary to add protection diodes to prevent

the capacitors from discharging through low current points

into the regulator. Most 10 µF capacitors have low enough

internal series resistance to deliver 20A spikes when

shorted. Although the surge is short, there is enough energy

to damage parts of the IC.

When an output capacitor is connected to a regulator and

the input is shorted, the output capacitor will discharge into

the output of the regulator. The discharge current depends

on the value of the capacitor, the output voltage of the

regulator, and the rate of decrease of V

. In the LM117, this

discharge path is through a large junction that is able to

sustain 15A surge with no problem. This is not true of other

types of positive regulators. For output capacitors of 25 µF or

less, there is no need to use diodes.

The bypass capacitor on the adjustment terminal can dis-

charge through a low current junction. Discharge occurs

00906305

FIGURE 1.

00906306

FIGURE 2. Regulator with Line Resistance in Output

Lead

LM117/LM317A/LM317

www.national.com 6

Application Hints (Continued)

when

either

the input or output is shorted. Internal to the

LM117 is a 50Ωresistor which limits the peak discharge

current. No protection is needed for output voltages of 25V

or less and 10 µF capacitance.

Figure 3

shows an LM117

with protection diodes included for use with outputs greater

than 25V and high values of output capacitance.

When a value for θ

(H−A)

is found using the equation shown,

a heatsink must be selected that has a value that is less than

or equal to this number.

(H−A)

is specified numerically by the heatsink manufacturer

in the catalog, or shown in a curve that plots temperature rise

vs power dissipation for the heatsink.

HEATSINKING TO-263, SOT-223 AND TO-252 PACKAGE

PARTS

The TO-263 (“S”), SOT-223 (“MP”) and TO-252 (”DT”) pack-

ages use a copper plane on the PCB and the PCB itself as

a heatsink. To optimize the heat sinking ability of the plane

and PCB, solder the tab of the package to the plane.

Figure 4

shows for the TO-263 the measured values of θ

(J−A)

for different copper area sizes using a typical PCB with 1

ounce copper

and no solder mask over the copper area used

for heatsinking.

As shown in the figure, increasing the copper area beyond 1

square inch produces very little improvement. It should also

be observed that the minimum value of θ

(J−A)

for the TO-263

package mounted to a PCB is 32˚C/W.

As a design aid,

Figure 5

shows the maximum allowable

power dissipation compared to ambient temperature for the

TO-263 device (assuming θ

(J−A)

is 35˚C/W and the maxi-

mum junction temperature is 125˚C).

Figure 6

and

Figure 7

show the information for the SOT-223

package.

Figure 7

assumes a θ

(J−A)

of 74˚C/W for 1 ounce

copper and 51˚C/W for 2 ounce copper and a maximum

junction temperature of 125˚C.

00906307

D1 protects against C1

D2 protects against C2

FIGURE 3. Regulator with Protection Diodes

00906355

FIGURE 4. θ

(J−A)

vs Copper (1 ounce) Area for the

TO-263 Package

00906356

FIGURE 5. Maximum Power Dissipation vs T

AMB

for

the TO-263 Package

LM117/LM317A/LM317

www.national.com7

Application Hints (Continued)

The LM317 regulators have internal thermal shutdown to

protect the device from over-heating. Under all possible

operating conditions, the junction temperature of the LM317

must be within the range of 0˚C to 125˚C. A heatsink may be

required depending on the maximum power dissipation and

maximum ambient temperature of the application. To deter-

mine if a heatsink is needed, the power dissipated by the

regulator, P

, must be calculated:

=(V

−V

OUT

Figure 8

shows the voltage and currents which are present in

the circuit.

The next parameter which must be calculated is the maxi-

mum allowable temperature rise, T

(max):

(max) = T

(max) − T

(max)

where T

(max) is the maximum allowable junction tempera-

ture (125˚C), and T

(max) is the maximum ambient tem-

perature which will be encountered in the application.

Using the calculated values for T

(max) and P

, the maxi-

mum allowable value for the junction-to-ambient thermal

resistance (θ

) can be calculated:

(max)/P

If the maximum allowable value for θ

is found to be

≥92˚C/W (Typical Rated Value) for TO-252 package, no

heatsink is needed since the package alone will dissipate

enough heat to satisfy these requirements. If the calculated

value for θ

falls below these limits, a heatsink is required.

As a design aid,

Table 1

shows the value of the θ

TO-252 for different heatsink area. The copper patterns that

we used to measure these θ

s are shown at the end of the

Application Notes Section.

Figure 9

reflects the same test

results as what are in the

Table 1

Figure 10

shows the maximum allowable power dissipation

vs. ambient temperature for the TO-252 device.

Figure 11

shows the maximum allowable power dissipation vs. copper

area (in

) for the TO-252 device. Please see AN1028 for

power enhancement techniques to be used with SOT-223

and TO-252 packages.

TABLE 1. θ

Different Heatsink Area

Layout Copper Area Thermal Resistance

Top Side (in

)* Bottom Side (in

)(θ

˚C/W) TO-252

1 0.0123 0 103

2 0.066 0 87

3 0.3 0 60

4 0.53 0 54

5 0.76 0 52

61 0 47

7 0 0.2 84

8 0 0.4 70

9 0 0.6 63

00906357

FIGURE 6. θ

(J−A)

vs Copper (2 ounce) Area for the

SOT-223 Package

00906358

FIGURE 7. Maximum Power Dissipation vs T

AMB

for

the SOT-223 Package

00906360

FIGURE 8. Power Dissipation Diagram

LM117/LM317A/LM317

www.national.com 8

Application Hints (Continued)

TABLE 1. θ

Different Heatsink Area (Continued)

Layout Copper Area Thermal Resistance

10 0 0.8 57

11 0 1 57

12 0.066 0.066 89

13 0.175 0.175 72

14 0.284 0.284 61

15 0.392 0.392 55

16 0.5 0.5 53

Note: *Tab of device attached to topside of copper.

00906361

FIGURE 9. θ

vs 2oz Copper Area for TO-252

00906363

FIGURE 10. Maximum Allowable Power Dissipation vs. Ambient Temperature for TO-252

00906362

FIGURE 11. Maximum Allowable Power Dissipation vs. 2oz Copper Area for TO-252

LM117/LM317A/LM317

www.national.com9

Application Hints (Continued)

00906364

FIGURE 12. Top View of the Thermal Test Pattern in Actual Scale

LM117/LM317A/LM317

www.national.com 10

Application Hints (Continued)

00906365

FIGURE 13. Bottom View of the Thermal Test Pattern in Actual Scale

LM117/LM317A/LM317

www.national.com11

Schematic Diagram

00906308

Typical Applications

5V Logic Regulator with Electronic Shutdown*

00906303

*Min. output )1.2V

Slow Turn-On 15V Regulator

00906309

Adjustable Regulator with Improved Ripple Rejection

00906310

†Solid tantalum

*Discharges C1 if output is shorted to ground

High Stability 10V Regulator

00906311

LM117/LM317A/LM317

www.national.com 12

Typical Applications (Continued)

High Current Adjustable Regulator

00906312

Optional—improves ripple rejection

†Solid tantalum

*Minimum load current = 30 mA

0 to 30V Regulator

00906313

Full output current not available at high input-output voltages

Power Follower

00906314

LM117/LM317A/LM317

www.national.com13

Typical Applications (Continued)

5A Constant Voltage/Constant Current Regulator

00906315

†Solid tantalum

*Lights in constant current mode

1A Current Regulator

00906316

1.2V–20V Regulator with Minimum Program Current

00906317

*Minimum load current )4mA

High Gain Amplifier

00906318

LM117/LM317A/LM317

www.national.com 14

Typical Applications (Continued)

Low Cost 3A Switching Regulator

00906319

†Solid tantalum

*Core—Arnold A-254168-2 60 turns

4A Switching Regulator with Overload Protection

00906320

†Solid tantalum

*Core—Arnold A-254168-2 60 turns

Precision Current Limiter

00906321

LM117/LM317A/LM317

www.national.com15

Typical Applications (Continued)

Tracking Preregulator

00906322

Current Limited Voltage Regulator

00906323

(Compared to LM117’s higher current limit)

—At 50 mA output only

⁄

volt of drop occurs in R3and R4

Adjusting Multiple On-Card Regulators with Single Control*

00906324

*All outputs within ±100 mV

†Minimum load—10 mA

LM117/LM317A/LM317

www.national.com 16

Typical Applications (Continued)

AC Voltage Regulator

00906325

12V Battery Charger

00906326

Use of RSallows low charging rates with fully charged battery.

50 mA Constant Current Battery Charger

00906327

LM117/LM317A/LM317

www.national.com17

Typical Applications (Continued)

Adjustable 4A Regulator

00906328

Current Limited 6V Charger

00906329

*Sets peak current (0.6A for 1Ω)

**The 1000 µF is recommended to filter out input transients

Digitally Selected Outputs

00906302

*Sets maximum VOUT

LM117/LM317A/LM317

www.national.com 18

Connection Diagrams

(TO-3)

Metal Can Package

00906330

Bottom View

Steel Package

Order Number LM117K STEEL

or LM317K STEEL

See NS Package Number K02A

Order Number LM117K/883

See NS Package Number K02C

CASE IS OUTPUT

(TO-39)

Metal Can Package

00906331

Bottom View

Order Number LM117H, LM117H/883,

LM317AH or LM317H

See NS Package Number H03A

CASE IS OUTPUT

(TO-220)

Plastic Package

00906332

Front View

Order Number LM317AT or LM317T

See NS Package Number T03B

(TO-263) Surface-Mount Package

00906335

Top View

00906336

Side View

Order Number LM317S

See NS Package Number TS3B

Ceramic Leadless

Chip Carrier

00906334

Top View

Order Number LM117E/883

See NS Package Number E20A

LM117/LM317A/LM317

www.national.com19

Connection Diagrams (Continued)

4-Lead SOT-223

00906359

Front View

Order Part Number LM317EMP or LM317AEMP

See NSC Package Number MA04A

TO-252 (D-Pak)

00906366

Front View

Order Part Number LM317DT

See NSC Package Number TD03B

LM117/LM317A/LM317

www.national.com 20

Physical Dimensions inches (millimeters)

unless otherwise noted

Ceramic Leadless Chip Carrier

Order Number LM117E/883

NS Package Number E20A

LM117/LM317A/LM317

www.national.com21

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

(TO-39) Metal Can Package

Order Number LM117H, LM117H/883, LM317AH or LM317H

NS Package Number H03A

TO-3 Metal Can Package (K)

Order Number LM117K STEEL,

LM117K STEEL/883, or LM317K STEEL

NS Package Number K02A

LM117/LM317A/LM317

www.national.com 22

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

TO-3 Metal Can Package (K)

Mil-Aero Product

Order Number LM117K/883

NS Package Number K02C

LM117/LM317A/LM317

www.national.com23

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

4-Lead SOT-223 Package

Order Number LM317AEMP or LM317EMP

NS Package Number MP04A

(TO-220) Outline Drawing

Order Number LM317AT or LM317T

NS Package Number T03B

LM117/LM317A/LM317

www.national.com 24

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

Order Number LM317S

NS Package Number TS3B

Order Number LM317MDT

NS Package Number TD03B

LM117/LM317A/LM317

www.national.com25

Notes

LIFE SUPPORT POLICY

NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT

DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL

COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:

1. Life support devices or systems are devices or

systems which, (a) are intended for surgical implant

into the body, or (b) support or sustain life, and

whose failure to perform when properly used in

accordance with instructions for use provided in the

labeling, can be reasonably expected to result in a

significant injury to the user.

2. A critical component is any component of a life

support device or system whose failure to perform

can be reasonably expected to cause the failure of

the life support device or system, or to affect its

safety or effectiveness.

National Semiconductor

Corporation

Americas

Tel: 1-800-272-9959

Fax: 1-800-737-7018

Email: support@nsc.com

National Semiconductor

Europe Fax: +49 (0) 180-530 85 86

Email: europe.support@nsc.com

Deutsch Tel: +49 (0) 69 9508 6208

English Tel: +44 (0) 870 24 0 2171

Français Tel: +33 (0) 1 41 91 8790

National Semiconductor

Asia Pacific Customer

Response Group

Tel: 65-2544466

Fax: 65-2504466

Email: ap.support@nsc.com

National Semiconductor

Japan Ltd.

Tel: 81-3-5639-7560

Fax: 81-3-5639-7507

www.national.com

LM117/LM317A/LM317 3-Terminal Adjustable Regulator

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.

Products > Analog - Regulators > Linear Regulators - Standard/NPN > Positive Voltage - Adjustable >

LM117

Product Folder

LM117 3-Terminal Adjustable Regulator

Generic P/N 117

Contents

General Description●

Features●

Datasheet●

Package Availability, Models, Samples & Pricing●

Parametric Table

Multiple Output Capability No

On/Off Pin No

Error Flag No

Input Voltage, min (Volt) 4.20

Input Voltage, max (Volt) 40

Output Current, max 500 mA,1500 mA

Watchdog No

Output Voltage, min (Volt) 1.20

Output Voltage, max (Volt) 37

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 voltage. 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 terminal is

disconnected.

Normally, no capacitors are needed unless the device is situated more than 6 inches from the input filter

capacitors in which case an input bypass is needed. An optional output capacitor 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 standard 3-terminal regulators.

Besides replacing fixed regulators, the LM117 is useful in a wide variety of other applications. Since the

regulator is "floating" and sees only the input-to-output differential voltage, supplies of several hundred

volts can be regulated as long as the maximum input to output differential is not exceeded, i.e., avoid

short-circuiting the output.

Also, it makes an especially simple adjustable switching regulator, a programmable output regulator, or

National P/N LM117 - 3-Terminal Adjustable Regulator

file:////roarer/root/export/projects/bitting2/imaging/BITTING/mail_pdf/2000/LM117.html (1 of 4) [9/6/2001 11:39:00 AM]

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 negative complement, see LM137 series data sheet.

Features

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●

P+ Product Enhancement tested●

80 dB ripple rejection●

Output is short-circuit protected●

Datasheet

Title Size

(in Kbytes) Date View Online Download Receive via

LM117/LM317A/LM317 3-Terminal Adjustable

Regulator 654 Kbytes 17-May-01 View Online Download Receive via Email

LM117 Mil-Aero Datasheet MNLM117-E 137 Kbytes View Online Download Receive via Email

LM117 Mil-Aero Datasheet MNLM117-X 216 Kbytes View Online Download Receive via Email

LM117 Mil-Aero Datasheet MNLM117-K 94 Kbytes View Online Download Receive via Email

Please use Adobe Acrobat to view PDF file(s).

If you have trouble printing, see Printing Problems.

Package Availability, Models, Samples & Pricing

Part Number

Package

Status

Models Samples

Electronic

Orders

Budgetary Pricing Std

Pack

Size

Package

Marking

Type #

pins SPICE IBIS Quantity $US each

LM117H TO-39 3Full

production N/A N/A

Buy Now

1K+ $3.7500 bag

500

[logo]¢Z¢2¢T

LM117HP+

National P/N LM117 - 3-Terminal Adjustable Regulator

file:////roarer/root/export/projects/bitting2/imaging/BITTING/mail_pdf/2000/LM117.html (2 of 4) [9/6/2001 11:39:00 AM]

LM117K STEEL TO-3 2Full

production N/A N/A

Buy Now

1K+ $4.0000 tray

[logo]¢Z¢2¢T

LM117K

STEELP+

LM117E/883 LCC 20 Full

production N/A N/A 50+ $27.7000 tube

[logo]¢Z¢S¢4¢A

LM117E

/883Q¢M$E

LM117H/883 TO-39 3Full

production N/A N/A

Buy Now

50+ $4.5000 tray

[logo]¢Z¢S¢4¢A$E

LM117H/883Q

LM117K/883 TO-3 2Full

production N/A N/A

Buy Now

50+ $5.3000 tray

[logo]¢Z¢S¢4¢A

LM117K/883

Q¢M $E

LM117WG-MPR Ceramic

SOIC 16 Preliminary N/A N/A tray

N/A

[logo]¢Z¢S¢4¢A$E

LM117WG-MPR

PROTO

LM117WG/883 Ceramic

SOIC 16 Full

production N/A N/A tray

N/A

[logo]¢Z¢S¢4¢A$E

LM117WG/883Q

LM117WGRQML Ceramic

SOIC 16 Full

production N/A N/A tray

N/A

[logo]¢Z¢S¢4¢A$E

LM117WGR

QML 5962R

9951703QZA

LM117HRQML TO-39 3Full

production N/A N/A tray

N/A

[logo]¢Z¢S¢4¢A

5962R99517

03QXA

LM117HRQML $E

JM38510/11703BX TO-39 3Full

production N/A N/A 50+ $10.4000 tray

[logo] ¢Z¢S¢4¢A

27014 Q¢M

JM38510/11703BXA

LM117KRQML TO-3 2Full

production N/A N/A tray

N/A

[logo]¢Z¢S¢4¢A

LM117KRQML

5962R99517

04QYA $E

JM38510/11704BY TO-3 2Full

production N/A N/A 50+ $11.2000 tray

[logo]¢Z¢S¢4¢A

JM38510/

11704BYA

27014 QS $E

LM117HRQMLV TO-39 3Full

production N/A N/A tray

N/A

[logo]¢Z¢S¢4¢A

5962R99517

03VXA

LM117HRQMLV

JM38510/11703SX TO-39 3Full

production N/A N/A 50+ $194.0000 tray

[logo] ¢Z¢S¢4¢A$E

27014 Q

JM38510/11703SXA

LM117KRQMLV TO-3 2Full

production N/A N/A tray

N/A

[logo]¢Z¢S¢4¢A

5962R99517

04VYA LM11

7KRQMLV $E

National P/N LM117 - 3-Terminal Adjustable Regulator

file:////roarer/root/export/projects/bitting2/imaging/BITTING/mail_pdf/2000/LM117.html (3 of 4) [9/6/2001 11:39:00 AM]

JM38510/11704SY TO-3 2Full
production N/A N/A   50+ $200.0000 tray
of
50
[logo]¢Z¢S¢4¢A
JM38510/
11704SYA
27014 Q$E
LM117WG-QMLV Ceramic
SOIC 16 Full
production N/A N/A       tray
of
N/A
[logo]¢Z¢S¢4¢A$E
LM117WG
-QMLV
LM117WGRQMLV Ceramic
SOIC 16 Full
production N/A N/A       tray
of
N/A
[logo]¢Z¢S¢4¢A$E
LM117WGR
QMLV 5962R
9951703VZA
LM117WG-MLS Ceramic
SOIC 16 Preliminary N/A N/A       tray
of
N/A
[logo]¢Z¢S¢4¢A$E
LM117WG-MLS
LM117H MD8 Die Full
production N/A N/A       tray
of
N/A -
LM117H MDS Die Full
production N/A N/A       tray
of
N/A -
LM117KG MD8 Die Full
production N/A N/A       tray
of
N/A -
LM117H MW8 Wafer Full
production N/A N/A       N/A -
LM117KG MW8 Die Full
production N/A N/A       N/A -
[Information as of 19-Jul-2001]
  Quick Search
 
Parametric
Search System
Diagrams Product
Tree Home
About Languages . Website Guide . About "Cookies" . National is QS 9000 Certified
Site Terms & Conditions of Use . Copyright 2001 © National Semiconductor Corporation
Privacy/Security Statement .   Preferences . Feedback
National P/N LM117 - 3-Terminal Adjustable Regulator
file:////roarer/root/export/projects/bitting2/imaging/BITTING/mail_pdf/2000/LM117.html (4 of 4) [9/6/2001 11:39:00 AM]