LM340, A Series MOTOROLA ANALOG IC DEVICE DATA 3 LM340–5.0 ELECTRICAL CHARACTERISTICS (Vin = 10 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.) Characteristics

SEMICONDUCTORTECHNICAL DATA

THREE–TERMINALPOSITIVE FIXED

VOLTAGE REGULATORS

Order this document by LM340/D

Pin 1. Input2. Ground3. Output

T SUFFIXPLASTIC PACKAGE

CASE 221A

Heatsink surface is connected to Pin 2.

3

12

Simplified Application

A common ground is required between the input andthe output voltages. The input voltage must remaintypically 1.7 V above the output voltage even duringthe 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 doesimprove transient response. If needed, use a0.1 µF ceramic disc.

LM340–XXInput

Cin*0.33µF CO**

Output

1MOTOROLA ANALOG IC DEVICE DATA

This family of fixed voltage regulators are monolithic integrated circuitscapable of driving loads in excess of 1.0 A. These three–terminal regulatorsemploy internal current limiting, thermal shutdown, and safe–areacompensation. Devices are available with improved specifications, includinga 2% output voltage tolerance, on A–suffix 5.0, 12 and 15 V device types.

Although designed primarily as a fixed voltage regulator, these devicescan be used with external components to obtain adjustable voltages andcurrents. This series of devices can be used with a series–pass transistor toboost 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 Safe–Area Compensation

ORDERING INFORMATION

DeviceOutput Voltageand Tolerance

OperatingTemperature Range Package

LM340T–5.0 5.0 V ± 4%

T 0 12 C Pl i P

LM340AT–5.0 5.0 V ± 2%

T 0 12 C Pl i P

LM340T–6.0 6.0 V ± 4%

T 0 12 C Pl i P

LM340T–8.0 8.0 V ± 4%

T 0 12 C Pl i PLM340T–12 12 V ± 4%

TJ = 0° to +125°C Plastic PowerLM340AT–12 12 V ± 2%

TJ = 0° to +125°C Plastic Power

LM340T–15 15 V ± 4%

LM340AT–15 15 V ± 2%

LM340T–18 18 V ± 4%

LM340T–24 24 V ± 4%

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

Motorola, Inc. 1996 Rev 1

LM340, A Series

2 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 3540

Vdc

Power Dissipation and Thermal CharacteristicsPlastic Package

TA = +25°CDerate above TA = +25°CThermal Resistance, Junction–to–Air

TC= +25°CDerate above TC = +75°C (See Figure 1)Thermal Resistance, Junction–to–Case

PD1/θJAθJA

PD1/θJAθJC

Internally Limited15.465

Internally Limited2005.0

WmW/°C°C/W

WmW/°C°C/W

Storage Temperature Range Tstg –65 to +150 °C

Operating Junction Temperature Range TJ 0 to +150 °C

Representative Schematic Diagram

1.0k210

Input

16k

6.7V

3001.0k

100

200

3.6k

6.4k

520

3.0k

5.6k10pF

30013 0.12

Output

200

50

2.6k6.0k

40pF

Gnd2.8k

3.9k2.0k

6.0k

1.0k

LM340, A Series


LM340–5.0ELECTRICAL 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°C)IO = 5.0 mA to 1.0 A

VO 4.8 5.0 5.2 Vdc

Line Regulation (Note 2)8.0 Vdc to 20 Vdc7.0 Vdc to 25 Vdc (TJ = +25°C)8.0 Vdc to 12 Vdc, IO = 1.0 A7.3 Vdc to 20 Vdc, IO = 1.0 A (TJ = +25°C)

Regline––––

––––

50502550

mV

Load Regulation (Note 2)5.0 mA ≤ IO ≤ 1.0 A5.0 mA ≤ IO ≤ 1.5 A (TJ = +25°C)250 mA ≤ IO ≤ 750 mA (TJ = +25°C)

Regload–––

–––

505025

mV

Output Voltage7.0 ≤ Vin ≤ 20 Vdc, 5.0 mA ≤ IO ≤ 1.0 A, PD ≤ 15 W

VO 4.75 – 5.25 Vdc

Quiescent CurrentIO = 1.0 ATJ = +25°C

IB––

–4.0

8.58.0

mA

Quiescent Current Change7.0 ≤ Vin ≤ 25 Vdc, IO = 500 mA5.0 mA ≤ IO ≤ 1.0 A, Vin = 10 V7.5 ≤ Vin ≤ 20 Vdc, IO = 1.0 A

∆IB–––

–––

1.00.51.0

mA

Ripple RejectionIO = 1.0 A (TJ = +25°C)

RR 62 80 – dB

Dropout Voltage VI – VO – 1.7 – Vdc

Output Resistance (f = 1.0 kHz) rO – 2.0 – mΩ

Short Circuit Current Limit (TJ = +25°C) ISC – 2.0 – A

Output Noise Voltage (TA = +25°C)10 Hz ≤ f ≤ 100 kHz

Vn – 40 – µV

Average Temperature Coefficient of Output VoltageIO = 5.0 mA

TCVO – ±0.6 – mV/°C

Peak Output Current (TJ = +25°C) IO – 2.4 – A

Input Voltage to Maintain Line Regulation (TJ = +25°C)IO = 1.0 A

7.3 – – Vdc

NOTES: 1. Tlow to Thigh = 0° to +125°C2. 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 achange in the input voltage. The measurement is made under conditions of low dissipation or by using pulsetechniques such that the average chip temperature is notsignificantly affected.

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

Maximum Power Dissipation – The maximum total devicedissipation for which the regulator will operate withinspecifications.

Quiescent Current – That part of the input current that is notdelivered to the load.

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

LM340, A Series


LM340A–5.0ELECTRICAL CHARACTERISTICS (Vin = 10 V, IO = 1.0 A, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)



VO 4.9 5.0 5.1 Vdc

Line Regulation 7.5 Vdc to 20 Vdc, IO = 500 mA7.3 Vdc to 25 Vdc (TJ = +25°C)8.0 Vdc to 12 Vdc8.0 Vdc to 12 Vdc (TJ = +25°C)

Regline––––

–3.0––

1010124.0

mV

Load Regulation 5.0 mA ≤ IO ≤ 1.0 A5.0 mA ≤ IO ≤ 1.5 A (TJ = +25°C)250 mA ≤ IO ≤ 750 mA (TJ = +25°C)

Regload–––

–––

252515

mV


VO 4.8 – 5.2 Vdc

Quiescent CurrentTJ = +25°C

IB ––

–3.5

6.56.0

mA

Quiescent Current Change5.0 mA ≤ IO ≤ 1.0 A, Vin = 10 V8.0 ≤ Vin ≤ 25 Vdc, IO = 500 mA7.5 ≤ Vin ≤ 20 Vdc, IO = 1.0 A (TJ = +25°C)

∆IB–––

–––

0.50.80.8

mA

Ripple Rejection8.0 ≤ Vin ≤ 18 Vdc, f = 120 Hz

IO = 500 mAIO = 1.0 A (TJ = +25°C)

RR

6868

–80

––

dB





Vn – 40 – µV


TCVO – ±0.6 – mV/°C



7.3 – – Vdc

NOTE: 1. Tlow to Thigh = 0° to +125°C

LM340, A Series





VO 5.75 6.0 6.25 Vdc

Line Regulation 9.0 Vdc to 21 Vdc8.0 Vdc to 25 Vdc (TJ = +25°C)9.0 Vdc to 13 Vdc, IO = 1.0 A8.3 Vdc to 21 Vdc, IO = 1.0 A (TJ = +25°C)

Regline––––

––––

60603060

mV


Regload–––

–––

606030

mV


VO 5.7 – 6.3 Vdc


IB––

–4.0

8.58.0

mA


∆IB–––

–––

1.00.51.0

mA


RR 59 78 – dB





Vn – 45 – µV


TCVO – ±0.7 – mV/°C



8.3 – – Vdc


LM340, A Series





VO 7.7 8.0 8.3 Vdc

Line Regulation 11 Vdc to 23 Vdc10.5 Vdc to 25 Vdc (TJ = +25°C)11 Vdc to 17 Vdc, IO = 1.0 A10.5 Vdc to 23 Vdc, IO = 1.0 A (TJ = +25°C)

Regline––––

––––

80804080

mV


Regload–––

–––

808040

mV


VO 7.6 – 8.4 Vdc


IB––

–4.0

8.58.0

mA


∆IB–––

–––

1.00.51.0

mA


RR 56 76 – dB





Vn – 52 – µV


TCVO – ±1.0 – mV/°C



10.5 – – Vdc


LM340, A Series


LM340–12ELECTRICAL CHARACTERISTICS (Vin = 19 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)



VO 11.5 12 12.5 Vdc

Line Regulation (Note 2)15 Vdc to 27 Vdc14.6 Vdc to 30 Vdc (TJ = +25°C)16 Vdc to 22 Vdc, IO = 1.0 A14.6 Vdc to 27 Vdc, IO = 1.0 A (TJ = +25°C)

Regline––––

––––

12012060120

mV


Regload–––

–––

12012060

mV


VO 11.4 – 12.6 Vdc


IB––

–4.0

8.58.0

mA


∆IB–––

–––

1.00.51.0

mA


RR 55 72 – dB





Vn – 75 – µV


TCVO – ±1.5 – mV/°C



14.6 – – Vdc



LM340, A Series


LM340A–12ELECTRICAL CHARACTERISTICS (Vin = 19 V, IO = 1.0 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)



VO 11.75 12 12.25 Vdc

Line Regulation 14.8 Vdc to 27 Vdc, IO = 500 mA14.5 Vdc to 30 Vdc (TJ = +25°C)16 Vdc to 22 Vdc16 Vdc to 22 Vdc (TJ = +25°C)

Regline––––

–4.0––

1818309.0

mV


Regload–––

–––

603219

mV


VO 11.5 – 12.5 Vdc


IB ––

–3.5

6.56.0

mA

Quiescent Current Change5.0 mA ≤ IO ≤ 1.0 A, Vin = 19 V15 ≤ Vin ≤ 30 Vdc, IO = 500 mA14.8 ≤ Vin ≤ 27 Vdc, IO = 1.0 A(TJ = +25°C)

∆IB–––

–––

0.50.80.8

mA

Ripple Rejection15 ≤ Vin ≤ 25 Vdc, f = 120 Hz

IO = 500 mAIO = 1.0 A (TJ = +25°C)

RR

6161

–72

––

dB





Vn – 75 – µV


TCVO – ±1.5 – mV/°C


Input Voltage to Maintain Line Regulation (TJ = +25°C) 14.5 – – Vdc


LM340, A Series





VO 14.4 15 15.6 Vdc

Line Regulation (Note 2)18.5 Vdc to 30 Vdc17.5 Vdc to 30 Vdc (TJ = +25°C)20 Vdc to 26 Vdc, IO = 1.0 A17.7 Vdc to 30 Vdc, IO = 1.0 A (TJ = +25°C)

Regline––––

––––

15015075150

mV


Regload–––

–––

15015075

mV


VO 14.25 – 15.75 Vdc


IB––

–4.0

8.58.0

mA


∆IB–––

–––

1.00.51.0

mA

Ripple RejectionIO = 1.0 mA (TJ = +25°C)

RR 54 70 – dB



Short Circuit Current Limit (TJ = +25°C) ISC – 800 – A


Vn – 90 – µV


TCVO – ±1.8 – mV/°C



17.7 – – Vdc



LM340, A Series


LM340A–15ELECTRICAL CHARACTERISTICS (Vin = 23 V, IO = 1.0 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)



VO 14.7 15 15.3 Vdc

Line Regulation 17.9 Vdc to 30 Vdc, IO = 500 mA17.5 Vdc to 30 Vdc (TJ = +25°C)20 Vdc to 26 Vdc, IO = 1.0 A20 Vdc to 26 Vdc, IO = 1.0 A (TJ = +25°C)

Regline––––

–4.0––

22223010

mV


Regload–––

–12–

753521

mV


VO 14.4 – 15.6 Vdc


IB ––

–3.5

6.56.0

mA

Quiescent Current Change5.0 mA ≤ IO ≤ 1.0 A, Vin = 23 V17.9 ≤ Vin ≤ 30 Vdc, IO = 500 mA17.9 ≤ Vin ≤ 30 Vdc, IO = 1.0 A (TJ = +25°C)

∆IB–––

–––

0.50.80.8

mA

Ripple Rejection18.5 ≤ Vin ≤ 28.5 Vdc, f = 120 Hz

IO = 500 mAIO = 1.0 A (TJ = +25°C)

RR

6060

–70

––

dB





Vn – 90 – µV


TCVO – ±1.8 – mV/°C


Input Voltage to Maintain Line Regulation (TJ = +25°C) 17.5 – – Vdc


LM340, A Series





VO 17.3 18 18.7 Vdc

Line Regulation 21.5 Vdc to 33 Vdc21 Vdc to 33 Vdc (TJ = +25°C)24 Vdc to 30 Vdc, IO = 1.0 A21 Vdc to 33 Vdc, IO = 1.0 A (TJ = +25°C)

Regline––––

––––

18018090180

mV


Regload–––

–––

18018090

mV

Output Voltage21 ≤ Vin ≤ 33 Vdc, 5.0 mA ≤ IO ≤ 1.0 A, PD ≤ 15 W

VO 17.1 – 18.9 Vdc


IB––

–4.0

8.58.0

mA

Quiescent Current Change21 ≤ Vin ≤ 33 Vdc, IO = 500 mA5.0 mA ≤ IO ≤ 1.0 A, Vin = 27 V21 ≤ Vin ≤ 33 Vdc, IO = 1.0 A

∆IB–––

–––

1.00.51.0

mA


RR 53 69 – dB





Vn – 110 – µV


TCVO – ±2.3 – mV/°C



21 – – Vdc


LM340, A Series





VO 23 24 25 Vdc

Line Regulation 28 Vdc to 38 Vdc27 Vdc to 38 Vdc (TJ = +25°C)30 Vdc to 36 Vdc, IO = 1.0 A27.1 Vdc to 38 Vdc, IO = 1.0 A (TJ = +25°C)

Regline––––

––––

240240120240

mV


Regload–––

–––

240240120

mV

Output Voltage27 ≤ Vin ≤ 38 Vdc, 5.0 mA ≤ IO ≤ 1.0 A, PD ≤ 15 W

VO 22.8 – 25.2 Vdc


IB––

–4.0

8.58.0

mA

Quiescent Current Change27 ≤ Vin ≤ 38 Vdc, IO = 500 mA5.0 mA ≤ IO ≤ 1.0 A, Vin = 33 V27.3 ≤ Vin ≤ 38 Vdc, IO = 1.0 A

∆IB–––

–––

1.00.51.0

mA


RR 50 66 – dB





Vn – 170 – µV


TCVO – ±3.0 – mV/°C



27.1 – – Vdc


LM340, A Series


VOLTAGE REGULATOR PERFORMANCE

The performance of a voltage regulator is specified by itsimmunity to changes in load, input voltage, power dissipation,and temperature. Line and load regulation are tested with apulse of short duration (< 100 µs) and are strictly a function ofelectrical gain. However, pulse widths of longer duration(> 1.0 ms) are sufficient to affect temperature gradientsacross the die. These temperature gradients can cause achange in the output voltage, in addition to changes causedby line and load regulation. Longer pulse widths and thermalgradients make it desirable to specify thermal regulation.

Thermal regulation is defined as the change in outputvoltage caused by a change in dissipated power for aspecified time, and is expressed as a percentage outputvoltage change per watt. The change in dissipated power can

be caused by a change in either input voltage or the loadcurrent. Thermal regulation is a function of IC layout and dieattach techniques, and usually occurs within 10 ms of achange in power dissipation. After 10 ms, additional changesin the output voltage are due to the temperature coefficient ofthe device.

Figure 1 shows the line and thermal regulation response ofa typical LM340AT–5.0 to a 10 W input pulse. The variation ofthe output voltage due to line regulation is labeled À and thethermal regulation component is labeled Á. Figure 2 showsthe load and thermal regulation response of a typicalLM340AT–5.0 to a 15 W load pulse. The output voltagevariation due to load regulation is labeled À and the thermalregulation component is labeled Á.

2

1

2

1V o

ut, O

UTP

UT

∆I o

ut, O

UTP

UT

V out

, OU

TPU

T∆

V in,

INPU

T

Vout = 5.0 VVin = 7.5 VIout = 1.0 ACO = 0TJ = 25°C

Vin – Vout = 5.0 VIout = 100 mA

Figure 1. Line and Thermal Regulation Figure 2. Load and Thermal Regulation

LM340AT–5.0Vout = 5.0 VVin = 15 VIout = 0 A → 1.5 A → 0 A

= Regline = 4.4 mV

t, TIME (2.0 ms/DIV)

CU

RR

ENT

(A)

VOLT

AGE

DEV

IATI

ON

(V)

(2.0

mV/

DIV

)

1

2

2.0

0

LM340AT–5.0Vout = 5.0 VVin = 8.0 V → 18 V → 8.0 VIout = 1.0 A

= Regline = 2.4 mV

t, TIME (2.0 ms/DIV)

VOLT

AGE

(V)

VOLT

AGE

DEV

IATI

ON

(V)

(2.0

mV/

DIV

)

1

2

18 V

8.0 V

2

2

Figure 3. Temperature Stability Figure 4. Output Impedance1.02

1.00

0.98–90 –50 –10 30 70 110 150 190

TJ, JUNCTION TEMPERATURE (°C)

NO

RM

ALIZ

ED O

UTP

UT

VOLT

AGE

100

10–1

10–2

10–3

10–4

1.0 10 100 1.0 k 10 k 100 k 1.0 M 10 M 100 Mf, FREQUENCY (Hz)

1.01

0.99

= Regtherm = 0.0030% VO/W = Regtherm = 0.0020% VO/W

ZO

Ω, O

UTP

UT

IMPE

DAN

CE

()

LM340, A Series


I out

, OU

TPU

T C

UR

REN

T (A

)

Vin

–Vou

t, IN

PUT–

OU

TPU

T VO

LTAG

ED

IFFE

REN

TIAL

(V)

I B, Q

UIE

SCEN

T C

UR

REN

T (m

A)

I B, Q

UIE

SCEN

T C

UR

REN

T (m

A)

Vout = 5.0 VVin = 10 VVin = 10 VCO = 0f = 120 HzTJ = 25°C

Iout = 1.5 AVout = 5.0 VVin = 10 VCO = 0TJ = 25°C

Figure 5. Ripple Rejection versus Frequency Figure 6. Ripple Rejection versus Output Current

Figure 7. Quiescent Current versusInput Voltage

Figure 8. Quiescent Current versusOutput Current

Figure 9. Dropout Voltage Figure 10. Peak Output Current

100

80

60

40

201.0 10 100 1.0 k 10 k 100 k 1.0 M 10 M 100 M

f, FREQUENCY (Hz)

RR

, RIP

PLE

REJ

ECTI

ON

(dB)

Iout = 50 mA

4.0

3.0

2.0

1.0

00 10 20 30 40

Vin, INPUT VOLTAGE (Vdc)

5.0

4.0

3.0

2.0

1.0

00.01 0.1 1.0 10

Iout, OUTPUT CURRENT (A)

100

80

60

40

300.01 0.1 1.0 10

Iout, OUTPUT CURRENT (A)

RR

, RIP

PLE

REJ

ECTI

ON

(dB)

TJ = 25°CVout = 5.0 VIout = 1.0 A

TJ = 25°CVin – Vout = 5.0 V

2.5

2.0

1.5

1.0

0.5

0–75 –50 –25 0 25 50 75 100 125

TA, AMBIENT TEMPERATURE (°C)

∆Vout = 100 mV

IO = 1.0 A

IO = 500 mA

IO = 10 mA

4.0

3.0

2.0

1.0

00 10 20 30 40

Vin–Vout, INPUT–OUTPUT VOLTAGE DIFFERENTIAL (V)

TJ = 25°C

LM340, A Series


V out

, OU

TPU

T VO

LTAG

E∆

DEV

IATI

ON

(V)

I out

, OU

TPU

T

V out

, OU

TPU

T VO

LTAG

E∆

DEV

IATI

ON

(V)

V in,

INPU

T VO

LTAG

E∆

CH

ANG

E (V

)

–0.1

Figure 11. Line Transient Response Figure 12. Load Transient Response

Figure 13. Worst Case Power Dissipationversus Ambient Temperature (Case 221A)

0 10 20 30 40

0.8

0.6

0.4

0.2

0

–0.2–0.4–0.6

1.0

0.5

0

t, TIME (µs)

Vout = 5.0 VIout = 150 mACO = 0TJ = 25°C

1.0

CU

RR

ENT

(A)

0 10 20 30 40

t, TIME (µs)

Vout = 5.0 VVin = 10 VCO = 0TJ = 25°C

0.3

0.2

0.1

0

–0.2–0.3

1.5

0.5

0

20

16

12

8.0

4.0

0–50 –25 0 25 50 75 100 125 150

TA, AMBIENT TEMPERATURE (°C)

, PO

WER

DIS

SIPA

TIO

N (W

)DP

θJC = 5°C/WθJA = 65°C/WTJ(max) = 150°C

θHS = 0°C/W

θHS = 5°C/W

θHS = 15°C/W

No Heatsink

LM340, A Series


APPLICATIONS INFORMATION

Design ConsiderationsThe LM340, A series of fixed voltage regulators are

designed with Thermal Overload Protection that shuts downthe circuit when subjected to an excessive power overloadcondition, Internal Short Circuit Protection that limits themaximum current the circuit will pass, and Output TransistorSafe–Area Compensation that reduces the output shortcircuit current as the voltage across the pass transistor isincreased.

In many low current applications, compensationcapacitors are not required. However, it is recommended thatthe regulator input be bypassed with a capacitor if the

regulator is connected to the power supply filter with long wirelengths, or if the output load capacitance is large. An inputbypass capacitor should be selected to provide goodhigh–frequency characteristics to insure stable operationunder all load conditions. A 0.33 µF or larger tantalum, mylar,or other capacitor having low internal impedance at highfrequencies should be chosen. The bypass capacitor shouldbe mounted with the shortest possible leads directly acrossthe regulators input terminals. Normally good constructiontechniques should be used to minimize ground loops andlead resistance drops since the regulator has no externalsense lead.

Figure 14. Current Regulator Figure 15. Adjustable Output Regulator

Figure 16. Current Boost Regulator Figure 17. Short Circuit Protection

5.0 VR

Input

0.33µF

LM340–5.0

R

IO

These regulators can also be used as a current source whenconnected as above. In order to minimize dissipation the LM340–5.0is chosen in this application. Resistor R determines the current asfollows:

IO = + IQ

IQ 1.5 mA over line and load changes

For example, a 1 A current source would require R to be a 5 Ω,10 W resistor and the output voltage compliance would be the inputvoltage less 7.0 V.

ConstantCurrent to

Grounded Load

Input

Output

1k 4

6

7 2

3

–

+

0.1µF

10k

MC1741G

Vout, 7.0 V to 20 VVin – VO ≥ 2.0 V

The addition of an operational amplifier allows adjustment to higher orintermediate values while retaining regulation characteristics. Theminimum voltage obtainable with this arrangement is 2.0 V greaterthan the regulator voltage.

0.33µF

R

0.1µF

Output

1.0µF

The LM340, A series can be current boosted with a PNP transistor. TheMJ2955 provides current to 5.0 A. Resistor R in conjuction with the VBEof the PNP determines when the pass transistor begins conducting; thiscircuit is not short circuit proof. Input–output differential voltageminimum is increased by VBE of the pass transistor.

MJ2955 or Equiv

LM340

LM340

Input RSC

MJ2955or Equiv.

Output

R

2N6049or Equiv.

1.0µF

The circuit of Figure 17 can be modified to provide supply protectionagainst short circuits by adding a short circuit sense resistor, RSC, andan additional PNP transistor. The current sensing PNP must be able tohandle the short circuit current of the three–terminal regulator.Therefore, 4.0 A plastic power transistor is specified.

LM340–5.0

Input

LM340, A Series


OUTLINE DIMENSIONS

T SUFFIXPLASTIC PACKAGE

CASE 221A–06ISSUE Y NOTES:

1. DIMENSIONING AND TOLERANCING PER ANSIY14.5M, 1982.

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

BODY AND LEAD IRREGULARITIES AREALLOWED.

DIM MIN MAX MIN MAXMILLIMETERSINCHES

A 0.570 0.620 14.48 15.75B 0.380 0.405 9.66 10.28C 0.160 0.190 4.07 4.82D 0.025 0.035 0.64 0.88F 0.142 0.147 3.61 3.73G 0.095 0.105 2.42 2.66H 0.110 0.155 2.80 3.93J 0.018 0.025 0.46 0.64K 0.500 0.562 12.70 14.27L 0.045 0.060 1.15 1.52N 0.190 0.210 4.83 5.33Q 0.100 0.120 2.54 3.04R 0.080 0.110 2.04 2.79S 0.045 0.055 1.15 1.39T 0.235 0.255 5.97 6.47U 0.000 0.050 0.00 1.27V 0.045 ––– 1.15 –––Z ––– 0.080 ––– 2.04

B

Q

H

Z

L

V

G

N

A

K

F

1 2 3

4

D

SEATINGPLANE–T–

CST

U

R

J

LM340, A Series


NOTES

LM340, A Series


NOTES

LM340, A Series


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LM340/D

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Documents

LM340, A Series MOTOROLA ANALOG IC DEVICE DATA 3 LM340–5.0 ELECTRICAL CHARACTERISTICS (Vin = 10 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.) Characteristics