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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 termi-
nal is disconnected.

Normally, no capacitors are needed unless the device is situ-
ated 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.

n

Guaranteed 1% output voltage tolerance (LM317A)

n

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

n

Guaranteed max. 0.3% load regulation (LM117)

n

Guaranteed 1.5A output current

n

Adjustable output down to 1.2V

n

Current limit constant with temperature

n

P

+

Product Enhancement tested

n

80 dB ripple rejection

n

Output is short-circuit protected

K

TO-3

1.5A

T

TO-220

1.5A

S

TO-263

1.5A

EMP

SOT-223

1A

DS009063-1

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.

DS009063-54

August 1999

© 1999 National Semiconductor Corporation

DS009063

www.national.com

19

CONNECTION DIAGRAM AND ORDERING NUMBERS (top view)

2

2

R

thj- ca se

R

thj- amb

Thermal Resistance Junction-case

Max

Thermal Resistance Junction-ambient

Max

3

62. 5

3

50

5

60

4

35

o

C/W

o

C/W

2

L7805
L7805C
L7852C
L7806
L7806C
L7808
L7808C
L7885C
L7809C
L7812
L7812C
L7815
L7815C
L7818
L7818C
L7820
L7820C
L7824
L7824C

L7805CV
L7852CV

L7806CV

L7808CV
L7885CV
L7809CV

L7812CV

L7815CV

L7818CV

L7820CV

L7824CV

L7805CD2T
L7852CD2T

L7806CD2T

L7808CD2T
L7885CD2T
L7809CD2T

L7812CD2T

L7815CD2T

L7818CD2T

L7820CD2T

L7824CD2T

L7805CP
L7852CP

L7806CP

L7808CP
L7885CP
L7809CP

L7812CP

L7815CP

L7818CP

L7820CP

L7824CP

L7805T
L7805CT
L7852CT
L7806T
L7806CT
L7808T
L7808CT
L7885CT
L7809CT
L7812T
L7812CT
L7815T
L7815CT
L7818T
L7818CT
L7820T
L7820CT
L7824T
L7824CT

5V
5V

5. 2V

6V
6V
8V
8V

8. 5V

9V

12V
12V
15V
15V
18V
18V
20V
20V
24V
24V

(*) AVAILABLE IN TAPE AND REEL WITH ”-TR” SUFFIX

V

i

DC Input Voltage (for V

O

= 5 to 18V)

(for V

O

= 20, 24V)

35
40

V
V

I

o

Output Current

I nternally limited

P

tot

Power Dissipation

I nternally limited

T

op

Operating Junction Temperature Range (for L7800)

(for L7800C)

-55 t o 150

0 to 150

o

C

o

C

T

st g

Storage Temperature Range

-65 t o 150

o

C

2/25

20

Advanced Monolithic Systems, Inc.    6680B Sierra Lane, Dublin, CA  94568   Phone (925) 556-9090   Fax (925) 556-9140

•• Three Terminal Adjustable or Fixed Voltages

•• High Efficiency Linear Regulators

•• Post Regulators for Switching Supplies

•• Output Current of  3A

•• Microprocessor Supply

•• Operates Down to 1V Dropout

•• Battery Chargers

•• Load Regulation: 0.1%

•• Constant Current Regulators

•• Line Regulation: 0.015%

•• Notebook/Personal Computer Supplies

•• TO-220, TO-263 and TO-252 packages available

•• Portable Instrumentation

 The  AMS1085  series of adjustable and fixed voltage regulators are designed to provide 3A output current and to operate
down to 1V input-to-output differential. The dropout voltage of the device is guaranteed maximum 1.5V at maximum output
current, decreasing at lower load currents.
 On-chip trimming adjusts the reference voltage to 1%. Current limit is also trimmed, minimizing the stress under overload
conditions on both the regulator and power source circuitry.
The AMS1085 devices are pin compatible with older three-terminal regulators and are offered in 3 lead TO-220 package, 3
and 2 lead TO-263 (Plastic DD) and TO-252 (D PAK) package.

3 LEAD TO-220

2&3 LEAD TO-263

TO-252

 AMS1085CT

 AMS1085CM

 AMS1085CD

0 to 125

° C

 AMS1085CT-1.5

 AMS1085CM-1.5

 AMS1085CD-1.5

0 to 125

° C

 AMS1085CT-2.5

 AMS1085CM-2.5

 AMS1085CD-2.5

0 to 125

° C

 AMS1085CT-2.85

 AMS1085CM-2.85  AMS1085CD-2.85

0 to 125

° C

 AMS1085CT-3.0

 AMS1085CM-3.0

 AMS1085CD-3.0

0 to 125

° C

 AMS1085CT-3.3

 AMS1085CM-3.3

 AMS1085CD-3.3

0 to 125

° C

 AMS1085CT-3.5

 AMS1085CM-3.5

 AMS1085CD-3.5

0 to 125

° C

 AMS1085CT-5.0

 AMS1085CM-5.0

 AMS1085CD-5.0

0 to 125

° C

FIXED VERSION

ADJUSTABLE VERSION

1- Ground
2- V

OUT

3- V

IN

1- Adjust
2- V

OUT

3- V

IN

TAB IS

OUTPUT

TO-252 FRONT VIEW

1

2

3

1

2

3

TAB IS

OUTPUT

2L TO-263 FRONT VIEW

1

2

3

TAB IS

 OUTPUT

TO-220 FRONT VIEW

1

2

3

TAB IS

OUTPUT

3L TO-263 FRONT VIEW

21

REV. C

Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.

a

␮s Slew Rate

√Hz

√Hz

ⴞ5 V to ⴞ15 V

PRODUCT DESCRIPTION
The AD825 is a superbly optimized operational amplifier for
high speed, low cost and dc parameters, making it ideally suited
for a broad range of signal conditioning and data acquisition
applications. The ac performance, gain, bandwidth, slew rate
and drive capability are all very stable over temperature. The
AD825 also maintains stable gain under varying load conditions.

The unique input stage has ultralow input bias current and
ultralow input current noise. Signals that go to either rail on this
high performance input do not cause phase reversals at the output.
These features make the AD825 a good choice as a buffer for
MUX outputs, creating minimal offset and gain errors.

The AD825 is fully specified for operation with dual 

±5 V and

±15 V supplies. This power supply flexibility, and the low sup-
ply current of 6.5 mA with excellent ac characteristics under all
supply conditions, makes the AD825 well suited for many
demanding applications.

Figure 1. Performance with Rail-to-Rail Input Signals

22