lm7812 positive voltage regulator

SEMICONDUCTORTECHNICAL DATA

Order this document by MC7800/D

D2T SUFFIXPLASTIC PACKAGE

CASE 936(D2PAK)

THREE–TERMINALPOSITIVE FIXED

VOLTAGE REGULATORS

STANDARD APPLICATION

A common ground is required between theinput and the output voltages. The input voltagemust remain typically 2.0 V above the outputvoltage even during the low point on the inputripple voltage.

XX,

MC78XXInput

Cin*0.33 µF

CO**

Output

Pin 1. Input2. Ground3. Output

T SUFFIXPLASTIC PACKAGE

CASE 221A

Heatsink surfaceconnected to Pin 2.

Heatsink surface (shown as terminal 4 incase outline drawing) is connected to Pin 2.

3

12

3

1 2

These two digits of the type number indicate nominal voltage.

Cin is required if regulator is located anappreciable distance from power supplyfilter.

CO is not needed for stability; however,it does improve transient response. Values of less than 0.1 µF could cause instability.

*

**

1MOTOROLA ANALOG IC DEVICE DATA

These voltage regulators are monolithic integrated circuits designed asfixed–voltage regulators for a wide variety of applications including local,on–card regulation. These regulators employ internal current limiting,thermal shutdown, and safe–area compensation. With adequate heatsinkingthey can deliver output currents in excess of 1.0 A. Although designedprimarily as a fixed voltage regulator, these devices can be used withexternal components to obtain adjustable voltages and currents.

• Output Current in Excess of 1.0 A

• No External Components Required

• Internal Thermal Overload Protection

• Internal Short Circuit Current Limiting

• Output Transistor Safe–Area Compensation

• Output Voltage Offered in 2% and 4% Tolerance

• Available in Surface Mount D2PAK and Standard 3–Lead TransistorPackages

• Previous Commercial Temperature Range has been Extended to aJunction Temperature Range of –40°C to +125°C

DEVICE TYPE/NOMINAL OUTPUT VOLTAGE

MC7805AC

5 0 V

MC7812C12 V

LM340AT–55 0 V

LM340T–1212 V

MC7805C5.0 V

MC7815AC

15 VLM340T–5 LM340AT–15

15 VMC7806AC

6 0 VMC7815C

15 V

MC7806C6.0 V

LM340T–15

MC7808AC8 0 V

MC7818AC18 V

MC7808C8.0 V

MC7818C18 V

MC7809C 9.0 V MC7824AC24 V

MC7812AC12 V

MC7824C24 V

LM340AT–1212 V

ORDERING INFORMATION

DeviceOutput Voltage

ToleranceOperating

Temperature Range Package

MC78XXACT

2%

T 40° 125°C

Insertion MountLM340AT–XX 2%

T 40° 125°C

Insertion Mount

MC78XXACD2TTJ = –40° to +125°C

Surface Mount

MC78XXCT

4%

TJ = –40° to +125°C

Insertion MountLM340T–XX 4%

Insertion Mount

MC78XXCD2T Surface Mount

XX indicates nominal voltage.

Motorola, Inc. 1997 Rev 5

MC7800, MC7800A, LM340, LM340A Series

2 MOTOROLA ANALOG IC DEVICE DATA

MAXIMUM RATINGS (TA = 25°C, unless otherwise noted.)

Rating Symbol Value Unit

Input Voltage (5.0 – 18 V) VI 35 VdcInput Voltage (24 V) 40

Power DissipationCase 221A

TA = 25°C PD Internally Limited WThermal Resistance, Junction–to–Ambient RθJA 65 °C/WThermal Resistance, Junction–to–Case RθJC 5.0 °C/W

Case 936 (D2PAK)TA = 25°C PD Internally Limited WThermal Resistance, Junction–to–Ambient RθJA See Figure 13 °C/WThermal Resistance, Junction–to–Case RθJA 5.0 °C/W

Storage Junction Temperature Range Tstg –65 to +150 °C

Operating Junction Temperature TJ +150 °C

NOTE: ESD data available upon request.

R15680R18

100 k

D1Zener

R110.66 k

R21.56 k

R179.0 k

Q7QNPN

LATQ17

Q9QNPN 2

Q8QNPN

Q14QNPN

Q6QNPN

Q5QNPN 2

LAT 3 AQ18

R54.5 k

R61.0 k

Q13QNPN

Q2QNPN 4

SUBQ11 2

R1115 k

QNPN 6

Q1

R714 k

R31.8 k

R85.0 k

Diode

Q16

Q4QNPN

N+C130 PC2

3.0 P

R93.0 k

R16600

R2017500

Q15QNPN

Q10QNPN

R22100

Q12QNPN

R2450

1.0 P

R21600

R230.2

R1927.5 k

D2Zener

Q19QNPN

R141.0 k

Q20QNPN

R289.0 k

R279.0 k

R299.0 k

R256.0 k

R263.0 k

R123.0 k

R103340–(3316ACT)

R3018 k

Sense

Vout5.01

Vin

R1311660

Q3QNPN

MC7800

C3

Representative Schematic Diagram

This device contains 22 active transistors.



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

MC7805C/LM340T–5

Characteristic Symbol Min Typ Max Unit

Output Voltage (TJ = 25°C) VO 4.8 5.0 5.2 Vdc

Output Voltage (5.0 mA ≤ IO ≤ 1.0 A, PD ≤ 15 W) VO Vdc7.0 Vdc ≤ Vin ≤ 20 Vdc 4.75 5.0 5.258.0 Vdc ≤ Vin ≤ 20 Vdc – – –

Line Regulation (Note 2) Regline mV7.5 Vdc ≤ Vin ≤ 20 Vdc, 1.0 A – 0.5 208.0 Vdc ≤ Vin ≤ 12 Vdc – 0.8 10

Load Regulation (Note 2) Regload mV5.0 mA ≤ IO ≤ 1.0 A – 1.3 255.0 mA ≤ IO ≤ 1.5 A (TA = 25°C) - 1.3 25

Quiescent Current IB – 3.2 6.5 mA

Quiescent Current Change ∆IB mA7.0 Vdc ≤ Vin ≤ 25 Vdc – 0.3 1.05.0 mA ≤ IO ≤ 1.0 A (TA = 25°C) – 0.08 0.8

Ripple Rejection RR 62 83 – dB8.0 Vdc ≤ Vin ≤ 18 Vdc, f = 120 Hz

Dropout Voltage (IO = 1.0 A, TJ = 25°C) VI – VO – 2.0 – Vdc

Output Noise Voltage (TA = 25°C) Vn – 10 – µV/VO10 Hz ≤ f ≤ 100 kHz

Output Resistance f = 1.0 kHz rO – 0.9 – mΩ

Short Circuit Current Limit (TA = 25°C) ISC – 0.6 – AVin = 35 Vdc

Peak Output Current (TJ = 25°C) Imax – 2.2 – A

Average Temperature Coefficient of Output Voltage TCVO – –0.3 – mV/°C

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

MC7805AC/LM340AT–5



Output Voltage (5.0 mA ≤ IO ≤ 1.0 A, PD ≤ 15 W) VO 4.8 5.0 5.2 Vdc7.5 Vdc ≤ Vin ≤ 20 Vdc

Line Regulation (Note 2) Regline mV7.5 Vdc ≤ Vin ≤ 25 Vdc, IO = 500 mA – 0.5 108.0 Vdc ≤ Vin ≤ 12 Vdc, IO = 1.0 A – 0.8 128.0 Vdc ≤ Vin ≤ 12 Vdc, IO = 1.0 A, TJ = 25°C – 1.3 4.07.3 Vdc ≤ Vin ≤ 20 Vdc, IO = 1.0 A, TJ = 25°C – 4.5 10

Load Regulation (Note 2) Regload mV5.0 mA ≤ IO ≤ 1.5 A, TJ = 25°C – 1.3 255.0 mA ≤ IO ≤ 1.0 A – 0.8 25250 mA ≤ IO ≤ 750 mA – 0.53 15


Quiescent Current Change ∆IB mA8.0 Vdc ≤ Vin ≤ 25 Vdc, IO = 500 mA – 0.3 0.87.5 Vdc ≤ Vin ≤ 20 Vdc, TJ = 25°C – – 0.85.0 mA ≤ IO ≤ 1.0 A – 0.08 0.5

Ripple Rejection RR 68 83 – dB8.0 Vdc ≤ Vin ≤ 18 Vdc, f = 120 Hz, IO = 500 mA


NOTES: 1. Tlow = –40°C for MC78XXAC, C, LM340AT–XX, LM340T–XX Thigh = +125°C for MC78XXAC, C, LM340AT–XX, LM340T–XX

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.



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




Output Resistance (f = 1.0 kHz) rO – 0.9 – mΩ





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.


MC7806C



Output Voltage (5.0 mA ≤ IO ≤ 1.0 A, PD ≤ 15 W) VO Vdc8.0 Vdc ≤ Vin ≤ 21 Vdc 5.7 6.0 6.39.0 Vdc ≤ Vin ≤ 21 Vdc – – –

Line Regulation, TJ = 25°C (Note 2) Regline mV8.0 Vdc ≤ Vin ≤ 25 Vdc – 0.5 249.0 Vdc ≤ Vin ≤ 13 Vdc – 0.8 12

Load Regulation, TJ = 25°C (Note 2) Regload – 1.3 30 mV5.0 mA ≤ IO ≤ 1.5 A

Quiescent Current (TJ = 25°C) IB – 3.3 8.0 mA

Quiescent Current Change ∆IB mA8.0 Vdc ≤ Vin ≤ 25 Vdc – 0.3 1.35.0 mA ≤ IO ≤ 1.0 A – 0.08 0.5








NOTES: 1. Tlow = –40°C for MC78XXAC, C Thigh = +125°C for MC78XXAC, C

2. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into accountseparately. Pulse testing with low duty cycle is used.




MC7806AC




Line Regulation (Note 2) Regline mV8.6 Vdc ≤ Vin ≤ 25 Vdc, IO = 500 mA – 5.0 129.0 Vdc ≤ Vin ≤ 13 Vdc, IO = 1.0 A – 1.4 15



Quiescent Current Change ∆IB mA9.0 Vdc ≤ Vin ≤ 25 Vdc, IO = 500 mA – – 0.89.0 Vdc ≤ Vin ≤ 21 Vdc, IO = 1.0 A, TJ = 25°C – – 0.85.0 mA ≤ IO ≤ 1.0 A – – 0.5

Ripple Rejection RR 58 65 – dB9.0 Vdc ≤ Vin ≤ 19 Vdc, f = 120 Hz, IO = 500 mA








MC7808C




Line Regulation, TJ = 25°C, (Note 2) Regline mV10.5 Vdc ≤ Vin ≤ 25 Vdc – 6.0 3211 Vdc ≤ Vin ≤ 17 Vdc – 1.7 16



Quiescent Current Change ∆IB mA10.5 Vdc ≤ Vin ≤ 25 Vdc – – 1.05.0 mA ≤ IO ≤ 1.0 A – – 0.5








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

MC7808C







MC7808AC




Line Regulation (Note 2) Regline mV10.6 Vdc ≤ Vin ≤ 25 Vdc, IO = 500 mA – 6.0 1511 Vdc ≤ Vin ≤ 17 Vdc, IO = 1.0 A – 1.7 1810.4 Vdc ≤ Vin ≤ 23 Vdc, TJ = 25°C – 5.0 15



Quiescent Current Change ∆IB mA11 Vdc ≤ Vin ≤ 25 Vdc, IO = 500 mA – – 0.810.6 Vdc ≤ Vin ≤ 23 Vdc, IO = 1.0 A, TJ = 25°C – – 0.85.0 mA ≤ IO ≤ 1.0 A – – 0.5

Ripple Rejection RR 56 62 – dB11.5 Vdc ≤ Vin ≤ 21.5 Vdc, f = 120 Hz, IO = 500 mA












MC7809CT




Line Regulation, TJ = 25°C (Note 2) Regline mV11 Vdc ≤ Vin ≤ 26 Vdc – 6.2 3211.5 Vdc ≤ Vin ≤ 17 Vdc – 1.8 16



Quiescent Current Change ∆IB mA11.5 Vdc ≤ Vin ≤ 26 Vdc – – 1.05.0 mA ≤ IO ≤ 1.0 A – – 0.5

Ripple Rejection RR 56 61 – dB11.5 Vdc ≤ Vin ≤ 21.5 Vdc, f = 120 Hz








MC7812C/LM340T–12


Output Voltage (TJ = 25°C) VO 11.5 12 12.5 Vdc

Output Voltage (5.0 mA ≤ IO ≤ 1.0 A, PD ≤ 15 W) VO 11.4 12 12.6 Vdc14.5 Vdc ≤ Vin ≤ 27 Vdc

Line Regulation, TJ = 25°C (Note 2) Regline mV14.5 Vdc ≤ Vin ≤ 30 Vdc – 3.8 2416 Vdc ≤ Vin ≤ 22 Vdc – 0.3 2414.8 Vdc ≤ Vin ≤ 27 Vdc, IO = 1.0 A – – 48



Quiescent Current Change ∆IB mA14.5 Vdc ≤ Vin ≤ 30 Vdc, IO = 1.0 A, TJ = 25°C – – 0.715 Vdc ≤ Vin ≤ 30 Vdc – – 0.85.0 mA ≤ IO ≤ 1.0 A – – 0.5

Ripple Rejection RR 55 60 – dB15 Vdc ≤ Vin ≤ 25 Vdc, f = 120 Hz







MC7812C/LM340T–12












Line Regulation (Note 2) Regline mV14.8 Vdc ≤ Vin ≤ 30 Vdc, IO = 500 mA – 3.8 1816 Vdc ≤ Vin ≤ 22 Vdc, IO = 1.0 A – 2.2 2014.5 Vdc ≤ Vin ≤ 27 Vdc, TJ = 25°C – 6.0 120

Load Regulation (Note 2) Regload mV5.0 mA ≤ IO ≤ 1.5 A, TJ = 25°C – – 255.0 mA ≤ IO ≤ 1.0 A – – 25


Quiescent Current Change ∆IB mA15 Vdc ≤ Vin ≤ 30 Vdc, IO = 500 mA – – 0.814.8 Vdc ≤ Vin ≤ 27 Vdc, TJ = 25°C – – 0.85.0 mA ≤ IO ≤ 1.0 A, TJ = 25°C – – 0.5

Ripple Rejection RR 55 60 – dB15 Vdc ≤ Vin ≤ 25 Vdc, f = 120 Hz, IO = 500 mA












MC7815C/LM340T–15




Line Regulation, TJ = 25°C (Note 2) Regline mV17.9 Vdc ≤ Vin ≤ 30 Vdc – 8.5 3020 Vdc ≤ Vin ≤ 26 Vdc – 3.0 28



Quiescent Current Change ∆IB mA17.5 Vdc ≤ Vin ≤ 30 Vdc – – 0.817.5 Vdc ≤ Vin ≤ 30 Vdc, IO = 1.0 A, TJ = 25°C – – 0.75.0 mA ≤ IO ≤ 1.0 A – – 0.5

Ripple Rejection RR 54 58 – dB18.5 Vdc ≤ Vin ≤ 28.5 Vdc, f = 120 Hz












Line Regulation (Note 2) Regline mV17.9 Vdc ≤ Vin ≤ 30 Vdc, IO = 500 mA – 8.5 2020 Vdc ≤ Vin ≤ 26 Vdc – 3.0 2217.5 Vdc ≤ Vin ≤ 30 Vdc, IO = 1.0 A, TJ = 25°C – 7.0 20



Quiescent Current Change ∆IB mA17.5 Vdc ≤ Vin ≤ 30 Vdc, IO = 500 mA – – 0.817.5 Vdc ≤ Vin ≤ 30 Vdc, IO = 1.0 A, TJ = 25°C – – 0.85.0 mA ≤ IO ≤ 1.0 A – – 0.5





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



Ripple Rejection RR 60 80 – dB18.5 Vdc ≤ Vin ≤ 28.5 Vdc, f = 120 Hz, IO = 500 mA








MC7818C



Output Voltage (5.0 mA ≤ IO ≤ 1.0 A, PD ≤ 15 W) VO 17.1 18 18.9 Vdc21 Vdc ≤ Vin ≤ 33 Vdc

Line Regulation, (Note 2) Regline mV21 Vdc ≤ Vin ≤ 33 Vdc – 9.5 5024 Vdc ≤ Vin ≤ 30 Vdc – 3.2 25

Load Regulation, (Note 2) Regload – 2.0 55 mV5.0 mA ≤ IO ≤ 1.5 A


Quiescent Current Change ∆IB mA21 Vdc ≤ Vin ≤ 33 Vdc – – 1.05.0 mA ≤ IO ≤ 1.0 A – – 0.5


Dropout Voltage (IO = 1.0 A, TJ = 25°C) ViI – VO – 2.0 – Vdc











MC7818AC




Line Regulation (Note 2) Regline mV21 Vdc ≤ Vin ≤ 33 Vdc, IO = 500 mA – 9.5 2224 Vdc ≤ Vin ≤ 30 Vdc, IO = 1.0 A – 3.2 2524 Vdc ≤ Vin ≤ 30 Vdc, IO = 1.0 A, TJ = 25°C – 3.2 10.520.6 Vdc ≤ Vin ≤ 33 Vdc, IO = 1.0 A, TJ = 25°C – 8.0 22



Quiescent Current Change ∆IB mA21 Vdc ≤ Vin ≤ 33 Vdc, IO = 500 mA – – 0.821.5 Vdc ≤ Vin ≤ 30 Vdc, TJ = 25°C – – 0.85.0 mA ≤ IO ≤ 1.0 A – – 0.5









MC7824C


Output Voltage (TJ = 25°C) VO 23 24 25 Vdc


Line Regulation, (Note 2) Regline mV27 Vdc ≤ Vin ≤ 38 Vdc – 2.7 6030 Vdc ≤ Vin ≤ 36 Vdc – 2.7 48

Load Regulation, (Note 2) Regload – 4.4 65 mV5.0 mA ≤ IO ≤ 1.5 A


Quiescent Current Change ∆IB mA27 Vdc ≤ Vin ≤ 38 Vdc – – 1.05.0 mA ≤ IO ≤ 1.0 A – – 0.5






MC7824C










MC7824AC




Line Regulation (Note 2) Regline mV27 Vdc ≤ Vin ≤ 38 Vdc, IO = 500 mA – 11.5 2530 Vdc ≤ Vin ≤ 36 Vdc, IO = 1.0 A – 3.8 2830 Vdc ≤ Vin ≤ 36 Vdc, TJ = 25°C – 3.8 1226.7 Vdc ≤ Vin ≤ 38 Vdc, IO = 1.0 A, TJ = 25°C – 10 25



Quiescent Current Change ∆IB mA27.3 Vdc ≤ Vin ≤ 38 Vdc, IO = 500 mA – – 0.827 Vdc ≤ Vin ≤ 38 Vdc, TJ = 25°C – – 0.85.0 mA ≤ IO ≤ 1.0 A – – 0.5












Figure 1. Peak Output Current as a Function ofInput/Output Differential Voltage (MC78XXC, AC)

Figure 2. Ripple Rejection as a Function ofOutput Voltages (MC78XXC, AC)

Figure 3. Ripple Rejection as a Function ofFrequency (MC78XXC, AC)

Figure 4. Output Voltage as a Function ofJunction Temperature (MC7805C, AC)

Figure 5. Output Impedance as a Function ofOutput Voltage (MC78XXC, AC)

Figure 6. Quiescent Current as a Function ofTemperature (MC78XXC, AC)

I O

Vin–Vout, INPUT/OUPUT VOLTAGE DIFFERENTIAL (V)

3.0

2.0

1.5

1.0

04.0 8.0 12 20 30 40

, OU

TPU

T C

UR

REN

T (A

)

80

70

60

50

404.0 6.0 8.0 10 12 14 16 18 20 22 24

VO, OUTPUT VOLTAGE (V)

RR

, RIP

PLE

REJ

ECTI

ON

(dB)

PART # VinMC7805C = 10 VMC7806C = 11 VMC7808C = 14 VMC7812C = 19 VMC7815C = 23 VMC7818C = 27 VMC7824C = 33 V

80

50

RR

, RIP

PLE

REJ

ECTI

ON

(dB)

0.1 10

f, FREQUENCY (kHz)

0.01

, OU

TPU

T VO

LTAG

E (V

)O

5.0

4.9

–60 –20 20 60 100 140 180

TJ, JUNCTION TEMPERATURE (°C)

V

, OU

TPU

T IM

PED

ANC

E (m

)O

Ω

10

5.0

3.02.0

1.0

0.5

0.30.2

0.14.0 8.0 12 16 20 24

VO, OUTPUT VOLTAGE (V)

Z

, QU

IESC

ENT

CU

RR

ENT

(mA)

B

6.0

4.0

3.0

2.0

1.0

0–75 –50


–25 0 25 50 75 100 125

I

2.5

0.5

70

40

30

60

4.8

6.0 10 15 25 35

TJ = 85°C

TJ = 25°C

1.0

f = 120 HzIO = 20 mA∆Vin = 1.0 V(RMS)

TJ = 125°C

TJ = 0°C

f = 120 HzIO = 500 mACL = 0 µF

Vin = 10 VVO = 5.0 VIL = 20 mA

Vin = 20 VIO = 5.0 mA

MC78XXB, C, AC

Vin = 8.0 V to 18 VIO = 500 mAf = 120 HzTA = 25°C

TJ = –40°C



APPLICATIONS INFORMATION

Design ConsiderationsThe MC7800 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 recommendedthat the regulator input be bypassed with a capacitor if theregulator is connected to the power supply filter with long

wire lengths, or if the output load capacitance is large. Aninput bypass 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 athigh frequencies should be chosen. The bypass capacitorshould be mounted with the shortest possible leads directlyacross the regulators input terminals. Normally goodconstruction techniques should be used to minimize groundloops and lead resistance drops since the regulator has noexternal sense lead.

IO5.0 V

R IB

Figure 7. Current Regulator Figure 8. Adjustable Output Regulator

Figure 9. Current Boost Regulator Figure 10. Short Circuit Protection

The MC7800 regulators can also be used as a current source whenconnected as above. In order to minimize dissipation the MC7805C ischosen in this application. Resistor R determines the current as follows:

For example, a 1.0 A current source would require R to be a 5.0 Ω,10 W resistor and the output voltage compliance would be the inputvoltage less 7.0 V.

IB 3.2 mA over line and load changes.

Input

0.33 µF R

IO

MC7805

ConstantCurrent toGroundedLoad

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 greater than theregulator voltage.

InputMC7805

Output

0.33 µF

10 k

MC1741G

7

6

41.0 k

VO = 7.0 V to 20 VVIN = VO ≥ 2.0 V

0.1 µF

3

2

The MC7800 series can be current boosted with a PNP transistor. TheMJ2955 provides current to 5.0 A. Resistor R in conjunction with the VBEof the PNP determines when the pass transistor begins conducting; thiscircuit is not short circuit proof. Input/output differential voltage minimum isincreased by VBE of the pass transistor.

XX = 2 digits of type number indicating voltage.

MC78XX

Input

OutputR

1.0 µF

MJ2955 or Equiv.

1.0 µF

The circuit of Figure 9 can be modified to provide supply protection againstshort circuits by adding a short circuit sense resistor, RSC, and anadditional PNP transistor. The current sensing PNP must be able to handlethe short circuit current of the three–terminal regulator. Therefore, afour–ampere plastic power transistor is specified.

XX = 2 digits of type number indicating voltage.

1.0 µF

MC78XX

MJ2955or Equiv.

Output

RSC

R

2N6049or Equiv.

≥ 10 µF

RSource

0.33 µFInput

RSource

0.33 µF

≥ 10 µF



Figure 11. Worst Case Power Dissipation versusAmbient Temperature (Case 221A)

Figure 12. Input Output Differential as a Functionof Junction Temperature (MC78XXC, AC)

, PO

WER

DIS

SIPA

TIO

N (W

)D

20

16

12

8.0

4.0

0–50 –25 0 25 50 75 100 125 150

TA, AMBIENT TEMPERATURE (°C)

P

θHS = 0°C/W

DIF

FER

ENTI

AL (V

)in

out,

INPU

T–O

UTP

UT

VOLT

AGE

0.5

0–75 –50 –25 0 25 50 75 100 125


– V

V

IO = 0 mA

IO = 20 mA

IO = 1.0 A

IO = 500 mA

IO = 200 mA

∆VO = 2% of VO– – – Extended Curve for MC78XXB

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

θHS = 5°C/W

θHS = 15°C/W

No Heatsink

2.0

1.5

1.0

2.5

Figure 13. D 2PAK Thermal Resistance and MaximumPower Dissipation versus P.C.B. Copper Length

R, T

HER

MAL

RES

ISTA

NC

EJA θ JU

NC

TIO

N-T

O-A

IR (

C/W

)°

30

40

50

60

70

80

1.0

1.5

2.0

2.5

3.0

3.5

0 10 20 3025155.0

L, LENGTH OF COPPER (mm)

PD(max) for TA = 50°C

MinimumSize Pad

2.0 oz. CopperL

L

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ

Free AirMountedVertically

P D, M

AXIM

UM

PO

WER

DIS

SIPA

TIO

N (W

)

RθJA

DEFINITIONS

Line Regulation – The change in output voltage for achange in the input voltage. The measurement is made underconditions of low dissipation or by using pulse techniques suchthat the average chip temperature is not significantly affected.

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

Maximum Power Dissipation – The maximum totaldevice dissipation for which the regulator will operate withinspecifications.

Quiescent Current – That part of the input current that isnot delivered 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.

Long Term Stability – Output voltage stability underaccelerated life test conditions with the maximum ratedvoltage listed in the devices’ electrical characteristics andmaximum power dissipation.

Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regardingthe 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, andspecifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motoroladata 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 ofothers. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or otherapplications 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 injuryor death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorolaand its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney feesarising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges thatMotorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an EqualOpportunity/Affirmative Action Employer.



T SUFFIXPLASTIC PACKAGE

CASE 221A–06ISSUE Y

OUTLINE DIMENSIONS

MIN MINMAX MAXINCHES MILLIMETERS

DIMABCDFGHJKLNQRSTUVZ

14.489.664.070.643.612.422.800.46

12.701.154.832.542.041.155.970.001.15

–

15.7510.28

4.820.883.732.663.930.64

14.271.525.333.042.791.396.471.27

– 2.04

0.5700.3800.1600.0250.1420.0950.1100.0180.5000.0450.1900.1000.0800.0450.2350.0000.045

–

0.6200.4050.1900.0350.1470.1050.1550.0250.5620.0600.2100.1200.1100.0550.2550.050

– 0.080

NOTES:1. DIMENSIONING AND TOLERANCING PER ANSI

Y14.5M, 1982.2. CONTROLLING DIMENSION: INCH.3. DIM Z DEFINES A ZONE WHERE ALL BODY AND

LEAD IRREGULARITIES ARE ALLOWED.

–T– SEATINGPLANE

CST

U

J

R

FB

Q

H

Z

L

V

G

ND

K

A4

1 2 3

D2T SUFFIXPLASTIC PACKAGE

CASE 936–03(D2PAK)ISSUE B

5 REF5 REF

A

1 2 3

K

F

B

J

S

H

0.010 (0.254) TM

D

G

C

E

–T–

ML

P

NR

V

U

TERMINAL 4

NOTES:

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

2 CONTROLLING DIMENSION: INCH.3 TAB CONTOUR OPTIONAL WITHIN DIMENSIONS

A AND K.4 DIMENSIONS U AND V ESTABLISH A MINIMUM

MOUNTING SURFACE FOR TERMINAL 4.5 DIMENSIONS A AND B DO NOT INCLUDE MOLD

FLASH OR GATE PROTRUSIONS. MOLD FLASHAND GATE PROTRUSIONS NOT TO EXCEED0.025 (0.635) MAXIMUM.

DIMA

MIN MAX MIN MAXMILLIMETERS

0.386 0.403 9.804 10.236

INCHES

B 0.356 0.368 9.042 9.347C 0.170 0.180 4.318 4.572D 0.026 0.036 0.660 0.914E 0.045 0.055 1.143 1.397F 0.051 REF 1.295 REFG 0.100 BSC 2.540 BSCH 0.539 0.579 13.691 14.707J 0.125 MAX 3.175 MAXK 0.050 REF 1.270 REFL 0.000 0.010 0.000 0.254M 0.088 0.102 2.235 2.591N 0.018 0.026 0.457 0.660P 0.058 0.078 1.473 1.981RS 0.116 REF 2.946 REFU 0.200 MIN 5.080 MINV 0.250 MIN 6.350 MIN

Mfax is a trademark of Motorola, Inc.How to reach us:USA/EUROPE/Locations Not Listed : Motorola Literature Distribution; JAPAN : Nippon Motorola Ltd.: SPD, Strategic Planning Office, 4–32–1,P.O. Box 5405, Denver, Colorado 80217. 1–303–675–2140 or 1–800–441–2447 Nishi–Gotanda, Shinagawa–ku, Tokyo 141, Japan. 81–3–5487–8488

Customer Focus Center: 1–800–521–6274

Mfax : [email protected] – TOUCHTONE 1–602–244–6609 ASIA/PACIFIC : Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park,Motorola Fax Back System – US & Canada ONLY 1–800–774–1848 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852–26629298

– http://sps.motorola.com/mfax/HOME PAGE: http://motorola.com/sps/

MC7800/D◊

This datasheet has been download from:

www.datasheetcatalog.com

Datasheets for electronics components.

http://www.datasheetcatalog.com



lm7812 positive voltage regulator

Documents