LM340, A

Series

SEMICONDUCTOR

TECHNICAL DATA

THREETERMINAL

POSITIVE FIXED

VOLTAGE REGULATORS

Order this document by LM340/D

Pin 1. Input

2. Ground
3. Output

T SUFFIX

PLASTIC PACKAGE

CASE 221A

Heatsink surface is connected to Pin 2.

Simplified Application

A common ground is required between the input and
the output voltages. The input voltage must remain
typically 1.7 V above the output voltage even during
the low point on the input ripple voltage.

XX these two digits of the type number indicate

voltage.

* Cin is required if regulator is located an

appreciable distance from power supply filter.

** CO is not needed for stability; however, it does

improve transient response. If needed, use a
0.1

F ceramic disc.

LM340XX

Input

Cin*

0.33

CO**

Output

MOTOROLA ANALOG IC DEVICE DATA

Three-Terminal Positive

Fixed Voltage Regulators

This family of fixed voltage regulators are monolithic integrated circuits

capable of driving loads in excess of 1.0 A. These threeterminal regulators
employ internal current limiting, thermal shutdown, and safearea
compensation. Devices are available with improved specifications, including
a 2% output voltage tolerance, on Asuffix 5.0, 12 and 15 V device types.

Although designed primarily as a fixed voltage regulator, these devices

can be used with external components to obtain adjustable voltages and
currents. This series of devices can be used with a seriespass transistor to
boost output current capability at the nominal output voltage.

Output Current in Excess of 1.0 A

No External Components Required

Output Voltage Offered in 2% and 4% Tolerance*

Internal Thermal Overload Protection

Internal Short Circuit Current Limiting

Output Transistor SafeArea Compensation

ORDERING INFORMATION

Device

Output Voltage

and Tolerance

Operating

Temperature Range

Package

LM340T5.0

5.0 V

i P

LM340AT5.0

5.0 V

i P

LM340T6.0

6.0 V

i P

LM340T8.0

8.0 V

i P

LM340T12

12 V

TJ = 0

to +125

Plastic Power

LM340AT12

12 V

TJ = 0

to +125

Plastic Power

LM340T15

15 V

LM340AT15

15 V

LM340T18

18 V

LM340T24

24 V

* 2% regulators are available in 5, 12 and 15 V devices.

Motorola, Inc. 1996

Rev 1

LM340, A Series

MOTOROLA ANALOG IC DEVICE DATA

MAXIMUM RATINGS

(TA = +25

C unless otherwise noted.)

Rating

Symbol

Value

Unit

Input Voltage (5.0 V 18 V)

Input Voltage

(24 V)

Vin

35
40

Vdc

Power Dissipation and Thermal Characteristics

Plastic Package

TA = +25

Derate above TA = +25

Thermal Resistance, JunctiontoAir

TC= +25

Derate above TC = +75

C (See Figure 1)

Thermal Resistance, JunctiontoCase

Internally Limited

15.4

Internally Limited

200

5.0

mW/

C/W

mW/

C/W

Storage Temperature Range

Tstg

65 to +150

Operating Junction Temperature Range

0 to +150

Representative Schematic Diagram

1.0k

210

Input

16k

6.7V

300

1.0k

100

200

3.6k

6.4k

520

3.0k

5.6k

10pF

300

0.12

Output

200

2.6k

6.0k

40
pF

Gnd

2.8k

3.9k

2.0k

6.0k

1.0k

LM340, A Series

MOTOROLA ANALOG IC DEVICE DATA

LM3405.0
ELECTRICAL CHARACTERISTICS

(Vin = 10 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)

Characteristics

Symbol

Min

Typ

Max

Unit

Output Voltage (TJ = +25

IO = 5.0 mA to 1.0 A

4.8

5.0

5.2

Vdc

Line Regulation (Note 2)

8.0 Vdc to 20 Vdc
7.0 Vdc to 25 Vdc (TJ = +25

8.0 Vdc to 12 Vdc, IO = 1.0 A
7.3 Vdc to 20 Vdc, IO = 1.0 A (TJ = +25

Regline

50
50
25
50

Load Regulation (Note 2)

5.0 mA

1.0 A

5.0 mA

1.5 A (TJ = +25

250 mA

750 mA (TJ = +25

Regload

50
50
25

Output Voltage

7.0

Vin

20 Vdc, 5.0 mA

1.0 A, PD

15 W

4.75

5.25

Vdc

Quiescent Current

IO = 1.0 A
TJ = +25

4.0

8.5
8.0

Quiescent Current Change

7.0

Vin

25 Vdc, IO = 500 mA

5.0 mA

1.0 A, Vin = 10 V

7.5

Vin

20 Vdc, IO = 1.0 A

1.0
0.5
1.0

Ripple Rejection

IO = 1.0 A (TJ = +25

Dropout Voltage

VI VO

1.7

Vdc

Output Resistance (f = 1.0 kHz)

2.0

Short Circuit Current Limit (TJ = +25

ISC

2.0

Output Noise Voltage (TA = +25

10 Hz

100 kHz

Average Temperature Coefficient of Output Voltage

IO = 5.0 mA

TCVO

0.6

mV/

Peak Output Current (TJ = +25

2.4

Input Voltage to Maintain Line Regulation (TJ = +25

IO = 1.0 A

7.3

Vdc

NOTES: 1. Tlow to Thigh = 0

to +125

2. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately.

Pulse testing with low duty cycle is used.

DEFINITIONS

Line Regulation The change in output voltage for a
change in the input voltage. The measurement is made
under conditions of low dissipation or by using pulse
techniques such that the average chip temperature is not
significantly affected.

Load Regulation The change in output voltage for a
change in load current at constant chip temperature.

Maximum Power Dissipation The maximum total device
dissipation for which the regulator will operate within
specifications.

Quiescent Current That part of the input current that is not
delivered to the load.

Output Noise Voltage The rms AC voltage at the output,
with constant load and no input ripple, measured over a
specified frequency range.

LM340, A Series

MOTOROLA ANALOG IC DEVICE DATA

LM340A5.0
ELECTRICAL CHARACTERISTICS

(Vin = 10 V, IO = 1.0 A, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)

Characteristics

Symbol

Min

Typ

Max

Unit

Output Voltage (TJ = +25

IO = 5.0 mA to 1.0 A

4.9

5.0

5.1

Vdc

Line Regulation

7.5 Vdc to 20 Vdc, IO = 500 mA
7.3 Vdc to 25 Vdc (TJ = +25

8.0 Vdc to 12 Vdc
8.0 Vdc to 12 Vdc (TJ = +25

Regline

3.0

10
10
12

4.0

Load Regulation

5.0 mA

1.0 A

5.0 mA

1.5 A (TJ = +25

250 mA

750 mA (TJ = +25

Regload

25
25
15

Output Voltage

7.5

Vin

20 Vdc, 5.0 mA

1.0 A, PD

15 W

4.8

5.2

Vdc

Quiescent Current

TJ = +25

3.5

6.5
6.0

Quiescent Current Change

5.0 mA

1.0 A, Vin = 10 V

8.0

Vin

25 Vdc, IO = 500 mA

7.5

Vin

20 Vdc, IO = 1.0 A (TJ = +25

0.5
0.8
0.8

Ripple Rejection

8.0

Vin

18 Vdc, f = 120 Hz

IO = 500 mA
IO = 1.0 A (TJ = +25

68
68

Dropout Voltage

VI VO

1.7

Vdc

Output Resistance (f = 1.0 kHz)

2.0

Short Circuit Current Limit (TJ = +25

ISC

2.0

Output Noise Voltage (TA = +25

10 Hz

100 kHz

Average Temperature Coefficient of Output Voltage

IO = 5.0 mA

TCVO

0.6

mV/

Peak Output Current (TJ = +25

2.4

Input Voltage to Maintain Line Regulation (TJ = +25

IO = 1.0 A

7.3

Vdc

NOTE: 1. Tlow to Thigh = 0

to +125

LM340, A Series

MOTOROLA ANALOG IC DEVICE DATA

LM3406.0
ELECTRICAL CHARACTERISTICS

(Vin = 11 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)

Characteristics

Symbol

Min

Typ

Max

Unit

Output Voltage (TJ = +25

IO = 5.0 mA to 1.0 A

5.75

6.0

6.25

Vdc

Line Regulation

9.0 Vdc to 21 Vdc
8.0 Vdc to 25 Vdc (TJ = +25

9.0 Vdc to 13 Vdc, IO = 1.0 A
8.3 Vdc to 21 Vdc, IO = 1.0 A (TJ = +25

Regline

60
60
30
60

Load Regulation

5.0 mA

1.0 A

5.0 mA

1.5 A (TJ = +25

250 mA

750 mA (TJ = +25

Regload

60
60
30

Output Voltage

8.0

Vin

21 Vdc, 6.0 mA

1.0 A, PD

15 W

5.7

6.3

Vdc

Quiescent Current

IO = 1.0 A
TJ = +25

4.0

8.5
8.0

Quiescent Current Change

8.0

Vin

25 Vdc, IO = 500 mA

5.0 mA

1.0 A, Vin = 11 V

8.6

Vin

21 Vdc, IO = 1.0 A

1.0
0.5
1.0

Ripple Rejection

IO = 1.0 A (TJ = +25

Dropout Voltage

VI VO

1.7

Vdc

Output Resistance (f = 1.0 kHz)

2.0

Short Circuit Current Limit (TJ = +25

ISC

1.9

Output Noise Voltage (TA = +25

10 Hz

100 kHz

Average Temperature Coefficient of Output Voltage

IO = 5.0 mA

TCVO

0.7

mV/

Peak Output Current (TJ = +25

2.4

Input Voltage to Maintain Line Regulation (TJ = +25

IO = 1.0 A

8.3

Vdc

NOTE: 1. Tlow to Thigh = 0

to +125

LM340, A Series

MOTOROLA ANALOG IC DEVICE DATA

LM3408.0
ELECTRICAL CHARACTERISTICS

(Vin = 14 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)

Characteristics

Symbol

Min

Typ

Max

Unit

Output Voltage (TJ = +25

IO = 5.0 mA to 1.0 A

7.7

8.0

8.3

Vdc

Line Regulation

11 Vdc to 23 Vdc
10.5 Vdc to 25 Vdc (TJ = +25

11 Vdc to 17 Vdc, IO = 1.0 A
10.5 Vdc to 23 Vdc, IO = 1.0 A (TJ = +25

Regline

80
80
40
80

Load Regulation

5.0 mA

1.0 A

5.0 mA

1.5 A (TJ = +25

250 mA

750 mA (TJ = +25

Regload

80
80
40

Output Voltage

10.5

Vin

23 Vdc, 5.0 mA

1.0 A, PD

15 W

7.6

8.4

Vdc

Quiescent Current

IO = 1.0 A
TJ = +25

4.0

8.5
8.0

Quiescent Current Change

10.5

Vin

25 Vdc, IO = 500 mA

5.0 mA

1.0 A, Vin = 14 V

10.6

Vin

23 Vdc, IO = 1.0 A

1.0
0.5
1.0

Ripple Rejection

IO = 1.0 A (TJ = +25

Dropout Voltage

VI VO

1.7

Vdc

Output Resistance (f = 1.0 kHz)

2.0

Short Circuit Current Limit (TJ = +25

ISC

1.5

Output Noise Voltage (TA = +25

10 Hz

100 kHz

Average Temperature Coefficient of Output Voltage

IO = 5.0 mA

TCVO

1.0

mV/

Peak Output Current (TJ = +25

2.4

Input Voltage to Maintain Line Regulation (TJ = +25

IO = 1.0 A

10.5

Vdc

NOTE: 1. Tlow to Thigh = 0

to +125

LM340, A Series

MOTOROLA ANALOG IC DEVICE DATA

LM34012
ELECTRICAL CHARACTERISTICS

(Vin = 19 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)

Characteristics

Symbol

Min

Typ

Max

Unit

Output Voltage (TJ = +25

IO = 5.0 mA to 1.0 A

11.5

12.5

Vdc

Line Regulation (Note 2)

15 Vdc to 27 Vdc
14.6 Vdc to 30 Vdc (TJ = +25

16 Vdc to 22 Vdc, IO = 1.0 A
14.6 Vdc to 27 Vdc, IO = 1.0 A (TJ = +25

Regline

120
120

120

Load Regulation (Note 2)

5.0 mA

1.0 A

5.0 mA

1.5 A (TJ = +25

250 mA

750 mA (TJ = +25

Regload

120
120

Output Voltage

14.5

Vin

27 Vdc, 5.0 mA

1.0 A, PD

15 W

11.4

12.6

Vdc

Quiescent Current

IO = 1.0 A
TJ = +25

4.0

8.5
8.0

Quiescent Current Change

14.5

Vin

30 Vdc, IO = 500 mA

5.0 mA

1.0 A, Vin = 19 V

14.8

Vin

27 Vdc, IO = 1.0 A

1.0
0.5
1.0

Ripple Rejection

IO = 1.0 A (TJ = +25

Dropout Voltage

VI VO

1.7

Vdc

Output Resistance (f = 1.0 kHz)

2.0

Short Circuit Current Limit (TJ = +25

ISC

1.1

Output Noise Voltage (TA = +25

10 Hz

100 kHz

Average Temperature Coefficient of Output Voltage

IO = 5.0 mA

TCVO

1.5

mV/

Peak Output Current (TJ = +25

2.4

Input Voltage to Maintain Line Regulation (TJ = +25

IO = 1.0 A

14.6

Vdc

NOTES: 1. Tlow to Thigh = 0

to +125

2. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately.

Pulse testing with low duty cycle is used.

LM340, A Series

MOTOROLA ANALOG IC DEVICE DATA

LM340A12
ELECTRICAL CHARACTERISTICS

(Vin = 19 V, IO = 1.0 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)

Characteristics

Symbol

Min

Typ

Max

Unit

Output Voltage (TJ = +25

IO = 5.0 mA to 1.0 A

11.75

12.25

Vdc

Line Regulation

14.8 Vdc to 27 Vdc, IO = 500 mA
14.5 Vdc to 30 Vdc (TJ = +25

16 Vdc to 22 Vdc
16 Vdc to 22 Vdc (TJ = +25

Regline

4.0

18
18
30

9.0

Load Regulation

5.0 mA

1.0 A

5.0 mA

1.5 A (TJ = +25

250 mA

750 mA (TJ = +25

Regload

60
32
19

Output Voltage

14.8

Vin

27 Vdc, 5.0 mA

1.0 A, PD

15 W

11.5

12.5

Vdc

Quiescent Current

TJ = +25

3.5

6.5
6.0

Quiescent Current Change

5.0 mA

1.0 A, Vin = 19 V

Vin

30 Vdc, IO = 500 mA

14.8

Vin

27 Vdc, IO = 1.0 A(TJ = +25

0.5
0.8
0.8

Ripple Rejection

Vin

25 Vdc, f = 120 Hz

IO = 500 mA
IO = 1.0 A (TJ = +25

61
61

Dropout Voltage

VI VO

1.7

Vdc

Output Resistance (f = 1.0 kHz)

2.0

Short Circuit Current Limit (TJ = +25

ISC

1.1

Output Noise Voltage (TA = +25

10 Hz

100 kHz

Average Temperature Coefficient of Output Voltage

IO = 5.0 mA

TCVO

1.5

mV/

Peak Output Current (TJ = +25

2.4

Input Voltage to Maintain Line Regulation (TJ = +25

14.5

Vdc

NOTE: 1. Tlow to Thigh = 0

to +125

LM340, A Series

MOTOROLA ANALOG IC DEVICE DATA

LM34015
ELECTRICAL CHARACTERISTICS

(Vin = 23 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)

Characteristics

Symbol

Min

Typ

Max

Unit

Output Voltage (TJ = +25

IO = 5.0 mA to 1.0 A

14.4

15.6

Vdc

Line Regulation (Note 2)

18.5 Vdc to 30 Vdc
17.5 Vdc to 30 Vdc (TJ = +25

20 Vdc to 26 Vdc, IO = 1.0 A
17.7 Vdc to 30 Vdc, IO = 1.0 A (TJ = +25

Regline

150
150

150

Load Regulation (Note 2)

5.0 mA

1.0 A

5.0 mA

1.5 A (TJ = +25

250 mA

750 mA (TJ = +25

Regload

150
150

Output Voltage

17.5

Vin

30 Vdc, 5.0 mA

1.0 A, PD

15 W

14.25

15.75

Vdc

Quiescent Current

IO = 1.0 A
TJ = +25

4.0

8.5
8.0

Quiescent Current Change

17.5

Vin

30 Vdc, IO = 500 mA

5.0 mA

1.0 A, Vin = 23 V

17.9

Vin

30 Vdc, IO = 1.0 A

1.0
0.5
1.0

Ripple Rejection

IO = 1.0 mA (TJ = +25

Dropout Voltage

VI VO

1.7

Vdc

Output Resistance (f = 1.0 kHz)

2.0

Short Circuit Current Limit (TJ = +25

ISC

800

Output Noise Voltage (TA = +25

10 Hz

100 kHz

Average Temperature Coefficient of Output Voltage

IO = 5.0 mA

TCVO

1.8

mV/

Peak Output Current (TJ = +25

2.4

Input Voltage to Maintain Line Regulation (TJ = +25

IO = 1.0 A

17.7

Vdc

NOTES: 1. Tlow to Thigh = 0

to +125

2. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately.

Pulse testing with low duty cycle is used.

LM340, A Series

MOTOROLA ANALOG IC DEVICE DATA

LM340A15
ELECTRICAL CHARACTERISTICS

(Vin = 23 V, IO = 1.0 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)

Characteristics

Symbol

Min

Typ

Max

Unit

Output Voltage (TJ = +25

IO = 5.0 mA to 1.0 A

14.7

15.3

Vdc

Line Regulation

17.9 Vdc to 30 Vdc, IO = 500 mA
17.5 Vdc to 30 Vdc (TJ = +25

20 Vdc to 26 Vdc, IO = 1.0 A
20 Vdc to 26 Vdc, IO = 1.0 A (TJ = +25

Regline

4.0

22
22
30
10

Load Regulation

5.0 mA

1.0 A

5.0 mA

1.5 A (TJ = +25

250 mA

750 mA (TJ = +25

Regload

75
35
21

Output Voltage

17.9

Vin

30 Vdc, 5.0 mA

1.0 A, PD

15 W

14.4

15.6

Vdc

Quiescent Current

TJ = +25

3.5

6.5
6.0

Quiescent Current Change

5.0 mA

1.0 A, Vin = 23 V

17.9

Vin

30 Vdc, IO = 500 mA

17.9

Vin

30 Vdc, IO = 1.0 A (TJ = +25

0.5
0.8
0.8

Ripple Rejection

18.5

Vin

28.5 Vdc, f = 120 Hz

IO = 500 mA
IO = 1.0 A (TJ = +25

60
60

Dropout Voltage

VI VO

1.7

Vdc

Output Resistance (f = 1.0 kHz)

2.0

Short Circuit Current Limit (TJ = +25

ISC

800

Output Noise Voltage (TA = +25

10 Hz

100 kHz

Average Temperature Coefficient of Output Voltage

IO = 5.0 mA

TCVO

1.8

mV/

Peak Output Current (TJ = +25

2.4

Input Voltage to Maintain Line Regulation (TJ = +25

17.5

Vdc

NOTE: 1. Tlow to Thigh = 0

to +125

LM340, A Series

MOTOROLA ANALOG IC DEVICE DATA

LM34018
ELECTRICAL CHARACTERISTICS

(Vin = 27 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)

Characteristics

Symbol

Min

Typ

Max

Unit

Output Voltage (TJ = +25

IO = 5.0 mA to 1.0 A

17.3

18.7

Vdc

Line Regulation

21.5 Vdc to 33 Vdc
21 Vdc to 33 Vdc (TJ = +25

24 Vdc to 30 Vdc, IO = 1.0 A
21 Vdc to 33 Vdc, IO = 1.0 A (TJ = +25

Regline

180
180

180

Load Regulation

5.0 mA

1.0 A

5.0 mA

1.5 A (TJ = +25

250 mA

750 mA (TJ = +25

Regload

180
180

Output Voltage

Vin

33 Vdc, 5.0 mA

1.0 A, PD

15 W

17.1

18.9

Vdc

Quiescent Current

IO = 1.0 A
TJ = +25

4.0

8.5
8.0

Quiescent Current Change

Vin

33 Vdc, IO = 500 mA

5.0 mA

1.0 A, Vin = 27 V

Vin

33 Vdc, IO = 1.0 A

1.0
0.5
1.0

Ripple Rejection

IO = 1.0 mA (TJ = +25

Dropout Voltage

VI VO

1.7

Vdc

Output Resistance (f = 1.0 kHz)

2.0

Short Circuit Current Limit (TJ = +25

ISC

500

Output Noise Voltage (TA = +25

10 Hz

100 kHz

110

Average Temperature Coefficient of Output Voltage

IO = 5.0 mA

TCVO

2.3

mV/

Peak Output Current (TJ = +25

2.4

Input Voltage to Maintain Line Regulation (TJ = +25

IO = 1.0 A

Vdc

NOTE: 1. Tlow to Thigh = 0

to +125

LM340, A Series

MOTOROLA ANALOG IC DEVICE DATA

LM34024
ELECTRICAL CHARACTERISTICS

(Vin = 33 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)

Characteristics

Symbol

Min

Typ

Max

Unit

Output Voltage (TJ = +25

IO = 5.0 mA to 1.0 A

Vdc

Line Regulation

28 Vdc to 38 Vdc
27 Vdc to 38 Vdc (TJ = +25

30 Vdc to 36 Vdc, IO = 1.0 A
27.1 Vdc to 38 Vdc, IO = 1.0 A (TJ = +25

Regline

240
240
120
240

Load Regulation

5.0 mA

1.0 A

5.0 mA

1.5 A (TJ = +25

250 mA

750 mA (TJ = +25

Regload

240
240
120

Output Voltage

Vin

38 Vdc, 5.0 mA

1.0 A, PD

15 W

22.8

25.2

Vdc

Quiescent Current

IO = 1.0 A
TJ = +25

4.0

8.5
8.0

Quiescent Current Change

Vin

38 Vdc, IO = 500 mA

5.0 mA

1.0 A, Vin = 33 V

27.3

Vin

38 Vdc, IO = 1.0 A

1.0
0.5
1.0

Ripple Rejection

IO = 1.0 mA (TJ = +25

Dropout Voltage

VI VO

1.7

Vdc

Output Resistance (f = 1.0 kHz)

2.0

Short Circuit Current Limit (TJ = +25

ISC

200

Output Noise Voltage (TA = +25

10 Hz

100 kHz

170

Average Temperature Coefficient of Output Voltage

IO = 5.0 mA

TCVO

3.0

mV/

Peak Output Current (TJ = +25

2.4

Input Voltage to Maintain Line Regulation (TJ = +25

IO = 1.0 A

27.1

Vdc

NOTE: 1. Tlow to Thigh = 0

to +125

LM340, A Series

MOTOROLA ANALOG IC DEVICE DATA

VOLTAGE REGULATOR PERFORMANCE

The performance of a voltage regulator is specified by its

immunity to changes in load, input voltage, power dissipation,
and temperature. Line and load regulation are tested with a
pulse of short duration (< 100

s) and are strictly a function of

electrical gain. However, pulse widths of longer duration
(> 1.0 ms) are sufficient to affect temperature gradients
across the die. These temperature gradients can cause a
change in the output voltage, in addition to changes caused
by line and load regulation. Longer pulse widths and thermal
gradients make it desirable to specify thermal regulation.

Thermal regulation is defined as the change in output

voltage caused by a change in dissipated power for a
specified time, and is expressed as a percentage output
voltage change per watt. The change in dissipated power can

be caused by a change in either input voltage or the load
current. Thermal regulation is a function of IC layout and die
attach techniques, and usually occurs within 10 ms of a
change in power dissipation. After 10 ms, additional changes
in the output voltage are due to the temperature coefficient of
the device.

Figure 1 shows the line and thermal regulation response of

a typical LM340AT5.0 to a 10 W input pulse. The variation of
the output voltage due to line regulation is labeled

and the

thermal regulation component is labeled

. Figure 2 shows

the load and thermal regulation response of a typical
LM340AT5.0 to a 15 W load pulse. The output voltage
variation due to load regulation is labeled

and the thermal

regulation component is labeled

out

, OUTPUT

I out

, OUTPUT

out

, OUTPUT

, INPUT

Vout = 5.0 V

Vin = 7.5 V

Iout = 1.0 A

CO = 0

TJ = 25

Vin Vout = 5.0 V

Iout = 100 mA

Figure 1. Line and Thermal Regulation

Figure 2. Load and Thermal Regulation

LM340AT5.0
Vout = 5.0 V

Vin = 15 V

Iout = 0 A

1.5 A

0 A

= Regline = 4.4 mV

t, TIME (2.0 ms/DIV)

CURRENT

(A)

VOL

T
AGE DEVIA

TION (V)

(2.0 mV/DIV)

2.0

LM340AT5.0
Vout = 5.0 V

Vin = 8.0 V

18 V

8.0 V

Iout = 1.0 A

= Regline = 2.4 mV

t, TIME (2.0 ms/DIV)

VOL

T
AGE (V)

VOL

T
AGE DEVIA

TION (V)

(2.0 mV/DIV)

18 V

8.0 V

Figure 3. Temperature Stability

Figure 4. Output Impedance

1.02

1.00

0.98

110

150

190

TJ, JUNCTION TEMPERATURE (

NORMALIZED OUTPUT

VOL

T
AGE

100

101

102

103

104

1.0

100

1.0 k

10 k

100 k

1.0 M

10 M

100 M

f, FREQUENCY (Hz)

1.01

0.99

= Regtherm = 0.0030% VO/W

= Regtherm = 0.0020% VO/W

,
OUTPUT

IMPEDANCE (

)

LM340, A Series

MOTOROLA ANALOG IC DEVICE DATA

I out

, OUTPUT

CURRENT

(A)

out

, INPUTOUTPUT

VOL

T
AGE

DIFFERENTIAL

(V)

I B

, QUIESCENT

CURRENT

(mA)

I B

, QUIESCENT

CURRENT

(mA)

Vout = 5.0 V

Vin = 10 V

CO = 0

f = 120 Hz
TJ = 25

Iout = 1.5 A

Vout = 5.0 V

Vin = 10 V

CO = 0

TJ = 25

Figure 5. Ripple Rejection versus Frequency

Figure 6. Ripple Rejection versus Output Current

Figure 7. Quiescent Current versus

Input Voltage

Figure 8. Quiescent Current versus

Output Current

Figure 9. Dropout Voltage

Figure 10. Peak Output Current

100

1.0

100

1.0 k

10 k

100 k

1.0 M

10 M

100 M

f, FREQUENCY (Hz)

RR, RIPPLE REJECTION (dB)

Iout = 50 mA

4.0

3.0

2.0

1.0

Vin, INPUT VOLTAGE (Vdc)

5.0

4.0

3.0

2.0

1.0

0.01

0.1

1.0

Iout, OUTPUT CURRENT (A)

100

0.01

0.1

1.0

Iout, OUTPUT CURRENT (A)

RR, RIPPLE REJECTION (dB)

TJ = 25

Vout = 5.0 V

Iout = 1.0 A

TJ = 25

Vin Vout = 5.0 V

2.5

2.0

1.5

1.0

0.5

100

125

TA, AMBIENT TEMPERATURE (

Vout = 100 mV

IO = 1.0 A

IO = 500 mA

IO = 10 mA

4.0

3.0

2.0

1.0

VinVout, INPUTOUTPUT VOLTAGE DIFFERENTIAL (V)

TJ = 25

LM340, A Series

MOTOROLA ANALOG IC DEVICE DATA

out

, OUTPUT

VOL

T
AGE

DEVIA

TION (V)

I out

, OUTPUT

out

, OUTPUT

VOL

T
AGE

DEVIA

TION (V)

, INPUT

VOL

T
AGE

CHANGE (V)

0.1

Figure 11. Line Transient Response

Figure 12. Load Transient Response

Figure 13. Worst Case Power Dissipation

versus Ambient Temperature (Case 221A)

0.8

0.6

0.4

0.2

0.4

0.6

1.0

0.5

t, TIME (

Vout = 5.0 V

Iout = 150 mA

CO = 0

TJ = 25

1.0

CURRENT

(A)

t, TIME (

Vout = 5.0 V

Vin = 10 V

CO = 0

TJ = 25

0.3

0.2

0.1

0.2
0.3

1.5

0.5

8.0

4.0

100

125

150

TA, AMBIENT TEMPERATURE (

, POWER DISSIP

TION (W)

JC = 5

C/W

JA = 65

C/W

TJ(max) = 150

HS = 0

C/W

HS = 5

C/W

HS = 15

C/W

No Heatsink

LM340, A Series

MOTOROLA ANALOG IC DEVICE DATA

APPLICATIONS INFORMATION

Design Considerations

The LM340, A series of fixed voltage regulators are

designed with Thermal Overload Protection that shuts down
the circuit when subjected to an excessive power overload
condition, Internal Short Circuit Protection that limits the
maximum current the circuit will pass, and Output Transistor
SafeArea Compensation that reduces the output short
circuit current as the voltage across the pass transistor is
increased.

In many low current applications, compensation

capacitors are not required. However, it is recommended that
the regulator input be bypassed with a capacitor if the

regulator is connected to the power supply filter with long wire
lengths, or if the output load capacitance is large. An input
bypass capacitor should be selected to provide good
highfrequency characteristics to insure stable operation
under all load conditions. A 0.33

F or larger tantalum, mylar,

or other capacitor having low internal impedance at high
frequencies should be chosen. The bypass capacitor should
be mounted with the shortest possible leads directly across
the regulators input terminals. Normally good construction
techniques should be used to minimize ground loops and
lead resistance drops since the regulator has no external
sense lead.

Figure 14. Current Regulator

Figure 15. Adjustable Output Regulator

Figure 16. Current Boost Regulator

Figure 17. Short Circuit Protection

5.0 V

Input

0.33

LM3405.0

These regulators can also be used as a current source when
connected as above. In order to minimize dissipation the LM3405.0
is chosen in this application. Resistor R determines the current as
follows:

IO =

+ IQ

1.5 mA over line and load changes

For example, a 1 A current source would require R to be a 5

10 W resistor and the output voltage compliance would be the input
voltage less 7.0 V.

Constant

Current to

Grounded Load

Input

Output

0.1

10k

MC1741G

Vout, 7.0 V to 20 V

Vin VO

2.0 V

The addition of an operational amplifier allows adjustment to higher or
intermediate values while retaining regulation characteristics. The
minimum voltage obtainable with this arrangement is 2.0 V greater
than the regulator voltage.

0.33

0.1

Output

1.0

The LM340, A series can be current boosted with a PNP transistor. The
MJ2955 provides current to 5.0 A. Resistor R in conjuction with the VBE

of the PNP determines when the pass transistor begins conducting; this
circuit is not short circuit proof. Inputoutput differential voltage
minimum is increased by VBE of the pass transistor.

MJ2955 or Equiv

LM340

Input

RSC

MJ2955

or Equiv.

Output

2N6049

or Equiv.

1.0

The circuit of Figure 17 can be modified to provide supply protection
against short circuits by adding a short circuit sense resistor, RSC, and

an additional PNP transistor. The current sensing PNP must be able to
handle the short circuit current of the threeterminal regulator.
Therefore, 4.0 A plastic power transistor is specified.

LM3405.0

Input

LM340, A Series

MOTOROLA ANALOG IC DEVICE DATA

OUTLINE DIMENSIONS

T SUFFIX

PLASTIC PACKAGE

CASE 221A06

ISSUE Y

NOTES:

1. DIMENSIONING AND TOLERANCING PER ANSI

Y14.5M, 1982.

2. CONTROLLING DIMENSION: INCH.
3. DIMENSION Z DEFINES A ZONE WHERE ALL

BODY AND LEAD IRREGULARITIES ARE
ALLOWED.

DIM

MIN

MAX

MIN

MAX

MILLIMETERS

INCHES

0.570

0.620

14.48

15.75

0.380

0.405

9.66

10.28

0.160

0.190

4.07

4.82

0.025

0.035

0.64

0.88

0.142

0.147

3.61

3.73

0.095

0.105

2.42

2.66

0.110

0.155

2.80

3.93

0.018

0.025

0.46

0.64

0.500

0.562

12.70

14.27

0.045

0.060

1.15

1.52

0.190

0.210

4.83

5.33

0.100

0.120

2.54

3.04

0.080

0.110

2.04

2.79

0.045

0.055

1.15

1.39

0.235

0.255

5.97

6.47

0.000

0.050

0.00

1.27

0.045

1.15

0.080

2.04

2 3

SEATING
PLANE

T

LM340, A Series

MOTOROLA ANALOG IC DEVICE DATA

Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters which may be provided in Motorola
data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals"
must be validated for each customer application by customer's technical experts. Motorola does not convey any license under its patent rights nor the rights of
others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other
applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury
or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola
and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees
arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola
was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal
Opportunity/Affirmative Action Employer.

How to reach us:

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JAPAN: Nippon Motorola Ltd.; TatsumiSPDJLDC, 6F SeibuButsuryuCenter,

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3142 Tatsumi KotoKu, Tokyo 135, Japan. 038135218315

MFAX: RMFAX0@email.sps.mot.com TOUCHTONE 6022446609

ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park,

INTERNET: http://DesignNET.com

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LM340/D

*LM340/D*

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: LM340T-6.0

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: LM340T-6.0