Datasheet LM317MT, LM317MS, LM317MDT, LM217MDT, LM217MT Datasheet (SGS Thomson Microelectronics)

LM217M
LM317M

MEDIUM CURRENT

1.2 TO 37V ADJUSTABLE VOLTAGE REGULATOR

September 1997

■ OUTPUTVOLTAGERANGE : 1.2 TO37V

■ OUTPUTCURRENT IN EXCESSOF 500 mA

■ LINEREGULATION TYP.0.01%

■ LOADREGULATIONTYP. 0.1%

■ THERMALOVERLOADPROTECTION

■ SHORTCIRCUIT PROTECTION

■ OUTPUTTRANSISTORSAFEAREA

COMPENSATION

■ FLOATINGOPERATIONFOR HIGH

VOLTAGEAPPLICATIONS

DESCRIPTION

The LM217M/LM317M are monolithic integrated
circuits in TO-220,DPAK, SOT-82 and SOT-194
packages intended for use as positive adjustable
voltageregulators.
They are designedto supply until 500 mAof load
current with an output voltage adjustable over a

1.2 to 37V range.
The nominal output voltage is selectedby means
of only a resistive divider, making the device
exceptionally easy to use and eliminating the
stockingof many fixed regulators.

SCHEMATICDIAGRAM

SOT-82 SOT-194

DPAK

TO-252

TO-220

1/11

TEST CIRCUIT

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

i-Vo

Input-Output Differential Voltage 40 V

P

d

Power Dissipation Internally Limited

T

opr

Operating Junction Temperature Range (*) forLM217M

forLM317M

-40 to 125
0to125

o

C

o

C

T

stg

StorageTemperature Range -55 to 150

o

C

(*) Re-Boot is not guaranteed for Tj≥ 85oC

PINCONNECTION AND ORDERING NUMBERS

TO-220 SOT-82

Type TO-220 DPAK SOT-82 SOT-194

LM217M LM217MT LM217 M DT LM217MX LM217 M S
LM317M LM317MT LM317 M DT LM317MX LM317 M S

DPAK SOT-194

THERMAL DATA

Symbol Parameter SOT-82

SOT-194

DPAK

TO-220 Unit

R

thj-case

R

thj-amb

ThermalResistance Junction-case Max
ThermalResistance Junction-ambient Max

8

100

3

50

o

C/W

o

C/W

LM217M/LM317M

2/11

(*) CADJ is connected between Adjust pinand Ground.

ELECTRICALCHARACTERISTICS FOR LM317M (Refer to the test circuits, 0 ≤ Tj≤ 125oC
V

i-Vo

= 5 V, Io= 100 mA, Pd≤ 7.5W, unlessotherwisespecified)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

∆V

o

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

0.02 0.07 %/V

∆V

o

LoadRegulation Vo≤ 5V

I

o

=10mA to 500 mA

T

j

=25oC525mV

20 70 mV

V

o

≥ 5V

I

o

=10mA to 500 mA

T

j

=25oC 0.1 0.5 % /V

o

0.3 1. 5 %/ V

o

I

ADJ

Adjustment Pin Current 50 100 µA

∆I

ADJ

Adjustment Pin Current Vi-Vo= 3 to40 V

I

o

=10mA to 500 mA

0.2 5 µ A

V

REF

ReferenceVoltage Vi-Vo= 3 to40 V

I

o

=10mA to 500 mA

1.2 1.25 1.3 V

∆

V

o

V

o

OutputVoltage Temperature
Stability

0.7 %

I

o(min)

Minimum Load Current Vi-Vo=40V 3.5 10 mA

I

o(max)

Maximum OutputCurrent Vi-Vo≤15V

V

i-Vo

=40V, Pd<P

dMAX,Tj

=25oC

500 1000

200

mA

e

N

OutputNoise Voltage
(percentance of V

O

)

B = 10Hzto 10KHz
Tj=25oC

0.003 %

SVR Supply Voltage Rejection (*) T

j

=25oC

f = 120Hz

C

ADJ

=0 65 dB

C

ADJ

=10µF66 80 dB

(*) CADJ is connected between Adjust pinand Ground.

ELECTRICALCHARACTERISTICS FOR LM217M (Refer to the test circuits, -40 ≤ Tj≤ 125oC
V

i-Vo

= 5 V, Io= 100 mA, Pd≤ 7.5W, unlessotherwisespecified)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

∆V

o

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

0.02 0.05 %/V

∆V

o

LoadRegulation Vo≤ 5V

I

o

=10mA to 500 mA

T

j

=25oC515mV

20 50 mV

V

o

≥ 5V

I

o

=10mA to 500 mA

T

j

=25oC 0.1 0.3 % /V

o

0.3 1 %/V

o

I

ADJ

Adjustment Pin Current 50 100 µA

∆I

ADJ

Adjustment Pin Current Vi-Vo= 3 to40 V

I

o

=10mA to 500 mA

0.2 5 µ A

V

REF

Reference Voltage Vi-Vo= 3 to40 V

I

o

=10mA to 500 mA

1.2 1.25 1.3 V

∆

V

o

V

o

OutputVoltage Temperature
Stability

0.7 %

I

o(min)

Minimum LoadCurrent Vi-Vo=40V 3.5 5 mA

I

o(max)

Maximum OutputCurrent Vi-Vo≤15V

V

i-Vo

=40V, Pd<P

dMAX,Tj

=25oC

500 1000

200

mA

e

N

OutputNoise Voltage
(percentance of V

O

)

B = 10Hzto 10KHz
Tj=25oC

0.003 %

SVR Supply Voltage Rejection (*) T

j

=25oC

f = 120Hz

C

ADJ

=0 65 dB

C

ADJ

=10µF66 80 dB

LM217M/LM317M

3/11

Figure1 : Current Limit Figure2 : MinimumOperatingCurrent

Figure3 : Basic AdjustableRegulator.

LM317M

Figure4 : ThermalResistance& MaximumPower Dissipationvs P.C.B. Copper Lenght for DPAK

Pdmax calculatedfor Ta=50oC

LM217M/LM317M

4/11

APPLICATIONINFORMATION

The LM317M 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. 3), giving an output voltageV

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 maintain it very constant
with line and load changes. Usually, the error
term IADJ⋅R2 can 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 LM317M is a floating regulator and
”sees” only the input-to-outputdifferential voltage,
supplies of very high voltage with respect to
ground can be regulatedas long as themaximum
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
canbe usedas a precisioncurrent regulator.

In order to optimise the load regulation, the
current set resistor R1 (see fig. 3) should be tied
as close as possible to the regulator, while the
ground terminal of R2 should be near the ground
of the load to provide remote ground sensing.

EXTERNALCAPACITORS(Fig.5)

Normally no capacitors are needed unless the
device is situated far from the input filter
capacitors; in which case an input bypass is
needed.

A 0.1µF disc or 1µF tantalium input bypass
capacitor (C

I

) is recommended to reduce the

sensitivityto input line impedance.
The adjustment terminal may be bypassed to

ground to improve ripple rejection. This capacitor
(C

adj

) prevents ripple from being amplified as the
output voltage is increased. A 10µF capacitor
should improve ripple rejection about 80dB at
120Hzan a 10V application.

Although the LM317M is stable with no output
capacitance like any feedback circuit, certain
values of external capacitance can cause
excessive ringing. An output capacitance (C

O

)in
the form of a 1µF tantalium or 25µF aluminium
electrolytic capacitor on the output swamps this
effect andinsuresstability.

PROTECTIONDIODES (Fig.5)

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.

Figure 5 show the LM317M with the
recommended protection diodes for output
voltages in excess of 25V or high capacitance
values (C

3

>25µF, C2>10µF). Diode D1

prevents C

3

from discharging through the IC
during an input short-circuit. The combination of
diodes D1 and D2 prevents C

2

from discarging
through the regulator during an input or output
short-circuit.

START-UPBLOCK

It’s not guaranteed the Re-Boot of the device
when the junctiontemperatureis over 85

o

C.

LM217M/LM317M

5/11

Figure5 : VoltageRegulatorwith ProtectionDiodes.

Figure6 : Slow Turn-on 15V Regulator. Figure 7 : Current Regulator.

I

o

=

V

ref

R

1

+

I

ADJ

≈

1.25

V

R

1

Figure8 : 5V Electronic Shut-downRegulator. Figure9 : DigitallySelected Outputs.

(R2 sets maximum Vo)

LM317M

LM317M

LM317M

LM317M

LM317M

LM217M/LM317M

6/11

DIM.

mm inch

MIN. TYP. MAX. MIN. TYP. MAX.

A 4.8 0.189
C 1.37 0.054
D 2.4 2.8 0.094 0.110

D1 1.2 1.35 0.047 0.053

E 0.35 0.55 0.014 0.022

F 0.61 0.94 0.024 0.037

F2 1.15 1.4 0.045 0.055

G 4.95 5.08 5.21 0.195 0.200 0.205

H2 10.4 0.409
H3 10.05 10.4 0.396 0.409

L2 16.2 0.638
L3 26.3 26.7 27.1 1.035 1.051 1.067
L5 2.6 3 0.102 0.118
L6 15.1 15.8 0.594 0.622
L7 6 6.6 0.236 0.260

Dia. 3.65 3.85 0.144 0.152

P011D

TO-220 MECHANICALDATA

LM217M/LM317M

7/11

DIM.

mm inch

MIN. TYP. MAX. MIN. TYP. MAX.

A 2.2 2.4 0.086 0.094

A1 0.9 1.1 0.035 0.043
A2 0.03 0.23 0.001 0.009

B 0.64 0.9 0.025 0.035

B2 5.2 5.4 0.204 0.212

C 0.45 0.6 0.017 0.023

C2 0.48 0.6 0.019 0.023

D 6 6.2 0.236 0.244

E 6.4 6.6 0.252 0.260
G 4.4 4.6 0.173 0.181
H 9.35 10.1 0.368 0.397

L2 0.8 0.031
L4 0.6 1 0.023 0.039

==

D

L2

L4

13

==

B

E

==

B2

G

2

A

C2

C

H

A1

DETAIL”A”

A2

DETAIL”A”

TO-252 (DPAK) MECHANICAL DATA

0068772-B

LM217M/LM317M

8/11

DIM.

mm inch

MIN. TYP. MAX. MIN. TYP. MAX.

A 7.4 7.8 0.291 0.307

B 10.5 11.3 0.413 0.445

b 0.7 0.9 0.028 0.035

b1 0.49 0.75 0.019 0.030

C 2.4 2.7 0.04 0.106

c1 1.2 0.047

D 15.7 0.618

e 2.2 0.087

e3 4.4 0.173

F 3.8 0.150
H 2.54 0.100

F

A

H

BD

e3

e

b1

c1

C

b

SOT-82 MECHANICAL DATA

P032A

LM217M/LM317M

9/11

DIM.

mm inch

MIN. TYP. MAX. MIN. TYP. MAX.

A 7.4 7.8 0.291 0.307

B 10.5 11.3 0.413 0.445

b 0.7 0.9 0.028 0.035

b1 0.49 0.75 0.019 0.030

C 2.4 2.7 0.094 0.106

c1 1.2 0.047
c2 1.3 0.051

D 6 0.236

e 2.2 0.087

e3 4.4 0.173

F 3.8 0.150
H 2.54 0.100

P 45 (typ.)

S 4 0.157

S1 2 0.079

T 0.1 0.004

F

A

H

B

D

e3

e

b1

c2

C

b

P

T

C1

SS1

P032B

SOT-194 MECHANICAL DATA

LM217M/LM317M

10/11

Information furnished is believed tobe accurateand reliable.However, SGS-THOMSONMicroelectronicsassumes no responsabilityfor the
consequences of use ofsuch informationnor for anyinfringement of patents or other rights of thirdparties whichmay results from its use. No
licenseis granted by implicationor otherwise underany patentorpatentrights ofSGS-THOMSON Microelectronics.Specifications mentioned
in this publication are subject tochange withoutnotice. This publication supersedesand replaces all informationpreviouslysupplied.
SGS-THOMSONMicroelectronicsproducts arenotauthorizedfor use ascriticalcomponents inlife support devices orsystemswithoutexpress
writtenapproval ofSGS-THOMSON Microelectonics.

 1997 SGS-THOMSONMicroelectronics- Printedin Italy - AllRights Reserved

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LM217M/LM317M

11/11