SGS Thomson Microelectronics LM317P, LM317K, LM317D2T, LM217T, LM217K Datasheet

LM117/217

LM317

1.2V TO 37V VOLTAGE REGULATOR

November 1999

■ OUTPUT VOLTAGERANGE: 1.2TO 37V

■ OUTPUT CURRENT INEXCESS OF 1.5A

■ 0.1%LINE AND LOADREGULATION

■ FLOATINGOPERATION FOR HIGH

VOLTAGES

■ COMPLETESERIESOF PROTECTIONS:

CURRENTLIMITING,THERMAL
SHUTDOWNANDSOA CONTROL

DESCRIPTION

The LM117/LM217/LM317 are monolithic
integrated circuit in TO-220, ISOWATT220, TO-3
and D

2

PAK packages intended for use as

positiveadjustable voltageregulators.
They are designed to supply more than 1.5A of

load current with an output voltage adjustable
overa 1.2 to 37V range.

The nominal output voltage is selected by means
of only a resistive divider, making the device
exceptionally easy to use and eliminating the
stockingof manyfixed regulators.

TO-3

TO-220

D

2

PAK

ABSOLUTE MAXIMUMRATING

Symbol Parameter Value Unit

V

i-o

Input-output Differential Voltage 40 V

I

O

OutputCurrent Intenrally Limited

T

op

OperatingJunction Temperaturefor:LM117
LM217
LM317

-55 to 150

-25 to 150
0 to 125

o

C

o

C

o

C

P

tot

PowerDissipation Internally Limited

T

stg

StorageTemperature - 65 to 150

o

C

THERMALDATA

Symbol Parameter TO-3 TO-220 ISOWATT220 D2PAK Unit

R

thj-cas e

R

thj-amb

Thermal Resistance Junction-case Max
Thermal Resistance Junction-ambient Max

4

35

3

50

4

60

3

62.5

o

C/W

o

C/W

ISOWATT220



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CONNECTION DIAGRAM ANDORDERING NUMBERS

(top view)

TO-220

D

2

PAK TO-3

Type TO-3 TO-220 ISOWATT220 D

2

PAK

LM117 LM117K
LM217 LM217K LM217T LM217D2T
LM317 LM317K LM317T LM317P LM317D2T

SCHEMATIC DIAGRAM

ISOWATT220

LM117/217/317

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BASIC ADJUSTABLE REGULATOR

ELECTRICAL CHARACTERISTICS (V

i-Vo

= 5V, Io=500 mA, I

MAX

= 1.5Aand P

MAX

= 20W,unless

otherwisespecified)

Symbol Parameter Test Conditions LM117/LM217 LM317 Unit

Min. Typ. Max. Min. Typ. Max.

∆V

o

LineRegulation Vi-Vo= 3 to40 V Tj=25oC 0.01 0.02 0.01 0.04 %/V

0.02 0.05 0 . 02 0. 07 %/V

∆V

o

LoadRegulation

V

o

≤ 5V

I

o

=10mAtoI

MAX

Tj=25oC515 525mV

20 50 20 70 mV

V

o

≥

5V

I

o

=10mAtoI

MAX

Tj=25oC 0.1 0.3 0.1 0 .5 %

0.3 1 0.3 1.5 %

I

ADJ

Adjustment Pin Current 50 100 50 100

µ

A

∆

I

ADJ

Adjustment Pin Current Vi-Vo= 2.5 to 40V

I

o

=10mAtoI

MAX

0.2 5 0.2 5

µ

A

V

REF

Reference Voltage
(between pin3 andpin

1)

Vi-Vo= 2.5 to 40V
I

o

=10mAtoI

MAX

P

D

≤

P

MAX

1.21.251.3 1.21.251.3 V

∆

V

o

V

o

OutputVoltage
Temperature Stability

11%

I

o(min)

MinimumLoad Current Vi-Vo= 40V 3.5 5 3.5 10 mA

I

o(max)

Maximum Load
Current

V

i-Vo

≤

15 V

P

D<PMAX

1.52.2 1.52.2 A

V

i-Vo

=40V

P

D<PMAX

Tj=25oC

0.4 0.4 A

e

N

OutputNoise Voltage
(percentance of V

O

)

B= 10Hz to 10KHz
Tj=25oC

0.003 0.003 %

SVR Supply Voltage

Rejection(*)

T

j

=25oC

f =120 Hz

C

ADJ

=0 65 65 dB

C

ADJ

=10µF

66 80 66 80 dB

(*) CADJ is connected between pin 1 and ground.

Note:

(1) Unless otherwisespecified the above specs, apply over the following conditions :LM 117 T

j

= –55 to 150°C;

LM 217 T

j

= –25 to 150°C ; LM317 Tj= 0to 125°C.

LM117/217/317

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APPLICATION INFORMATION

The LM117/217/317 provides an internal
reference voltage of 1.25V between the output
and adjustments terminals. This is used to set a
constant current flow across an external resistor
divider(see fig. 4),giving an outputvoltage V

O

of:

V

O=VREF

(1 +

R

2

R

1

) +I

ADJR2

The device was designed to minimize the term
I

ADJ

(100µA max) and to maintainit very constant
with line and load changes. Usually, the error
term I

ADJ

⋅ R2can be neglected. To obtain the
previous requirement, all the regulator quiescent
current is returned to the output terminal,
imposinga minimum load current condition.If the
load is insufficient, the output voltagewill rise.

Since the LM117/217317 is a floating regulator
and ”sees” only the input-to-output differential

voltage,supplies of very highvoltage withrespect
to ground can be regulated as long as the
maximum input-to-output differential is not
exceeded. Furthermore, programmable regulator
are easily obtainable and, by connecting a fixed
resistor between the adjustment and output, the
device can be used as a precision current
regulator.

In order to optimise the load regulation, the
current set resistor R1 (see fig. 4) should be tied
as close as possible to the regulator, while the
ground terminal of R2 should be near the ground
of theload to provideremote ground sensing.

Performance may be improved with added
capacitanceas follow:

Aninput bypass capacitorof 0.1µF
An adjustment terminal to ground 10µF capacitor

Figure4 : Basic AdjustableRegulator.

Figure1 :

OutputCurrent vs. Input-output

DifferentialVoltage.

Figure2 :

DropoutVoltage vs. Junction

Temperature.

Figure3 : ReferenceVoltage vs.Junction

LM117/217/317

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