SEMICONDUCT
OR
TECHNICAL DATA
Order
this document by MC7800/D
D2T SUFFIX
PLASTIC PACKAGE
CASE 936
(D2PAK)
THREE–TERMINAL
POSITIVE FIXED
VOLTAGE REGULATORS
STANDARD APPLICATION
A common ground is required between the input
and the output voltages. The input voltage must
remain typically 2.0 V above the output voltage
even during the low point on the input ripple
voltage.
XX, these two digits of the type number
indicate nominal 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. Values
of less than 0.1 µF could cause instability.
MC78XX
Input
Cin*
0.33
µ
FCO**
Output
Pin 1. Input
2. Ground
3. Output
T SUFFIX
PLASTIC PACKAGE
CASE 221A
Heatsink surface
connected to Pin 2.
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
3
12
3
12
1
MOTOROLA ANALOG IC DEVICE DATA
These voltage regulators are monolithic integrated circuits designed as
fixed–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 heatsinking
they can deliver output currents in excess of 1.0 A. Although designed
primarily as a fixed voltage regulator, these devices can be used with
external 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 Transistor
Packages
DEVICE TYPE/NOMINAL OUTPUT VOLTAGE
MC7805
MC7806
MC7808
MC7809
5.0 V
6.0 V
8.0 V
9.0 V
MC7812
MC7815
MC7818
MC7824
12 V
15 V
18 V
24 V
ORDERING INFORMATION
Device Output Voltage
Tolerance Tested Operating
Temperature Range Package
MC78XXACT
2%
TJ = 0° to +125°C
Insertion Mount
MC78XXACD2T
2%
TJ = 0° to +125°C
Surface Mount
MC78XXCT
4%
TJ = 0° to +125°C
Insertion Mount
MC78XXCD2T
4%
Surface Mount
MC78XXBT
4%
TJ = – 40° to +125°C
Insertion Mount
MC78XXBD2T
TJ = – 40° to +125°C
Surface Mount
XX indicates nominal voltage.
Motorola, Inc. 1995
Rev 4
MC7800 Series
2MOTOROLA ANALOG IC DEVICE DATA
MAXIMUM RATINGS (TA = 25°C unless otherwise noted.)
Rating Symbol Value Unit
Input Voltage (5.0 – 18 V)
(24 V) VI35
40 Vdc
Power Dissipation
Case 221A
TA = 25°C PDInternally Limited W
Thermal Resistance, Junction–to–Ambient RθJA 65 °C/W
Thermal Resistance, Junction–to–Case RθJC 5.0 °C/W
Case 936 (D2PAK)
TA = 25°C PDInternally Limited W
Thermal Resistance, Junction–to–Ambient RθJA See Figure 13 °C/W
Thermal Resistance, Junction–to–Case RθJA 5.0 °C/W
Storage Junction Temperature Range Tstg –65 to +150 °C
Operating Junction Temperature TJ+150 °C
R15
680
R18
100 k
D1
Zener R1
10.66 k
R2
1.56 k
R17
9.0 k
Q7
QNPN
LAT
Q17
Q9
QNPN 2
Q8
QNPN
Q14
QNPN
Q6
QNPN
Q5
QNPN 2
LAT 3A
Q18
R5
4.5 k
R6
1.0 k
Q13
QNPN Q2
QNPN 4
SUB
Q11 2
R11
15 k
QNPN 6
Q1
R7
14 k R3
1.8 k R8
5.0 k
Diode
Q16
Q4
QNPN
N+ C1
30P
C2
3.0P
R9
3.0 k
R16
600
R20
17500
Q15
QNPN
Q10
QNPN
R22
100
Q12
QNPN
R24
50
1.0P
R21
600 R23
0.2
R19
27.5 k
D2
Zener
Q19
QNPN
R14
1.0 k
Q20
QNPN
R28
9.0 k
R27
9.0 k
R29
9.0 k
R25
6.0 k
R26
3.0 k
R12
3.0 k
R10
3340–(3316ACT)
R30
18 k Sense
Vout
5.01
Vin
R13
11660
Q3
QNPN
MC7800
C3
Representative Schematic Diagram
This device contains 22 active transistors.
MC7800 Series
3
MOTOROLA ANALOG IC DEVICE DATA
ELECTRICAL CHARACTERISTICS (Vin = 10 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
MC7805B MC7805C
Characteristic Symbol Min Typ Max Min Typ Max Unit
Output Voltage (TJ = 25°C) VO4.8 5.0 5.2 4.8 5.0 5.2 Vdc
Output Voltage
(5.0 mA ≤ IO ≤ 1.0 A, PD ≤15 W)
7.0 Vdc ≤ Vin ≤ 20 Vdc
8.0 Vdc ≤ Vin ≤ 20 Vdc
VO
–
4.75 –
5.0 –
5.25 4.75
–5.0
–5.25
–
Vdc
Line Regulation, TJ = 25°C (Note 2)
7.0 Vdc ≤ Vin ≤ 25 Vdc
8.0 Vdc ≤ Vin ≤ 12 Vdc
Regline –
–5.0
1.3 100
50 –
–5.0
1.3 100
50
mV
Load Regulation, TJ = 25°C (Note 2)
5.0 mA ≤ IO ≤ 1.5 A
250 mA ≤ IO ≤ 750 mA
Regload –
–1.3
0.15 100
50 –
–1.3
0.15 100
50
mV
Quiescent Current (TJ = 25°C) IB– 3.2 8.0 – 3.2 8.0 mA
Quiescent Current Change
7.0 Vdc ≤ Vin ≤ 25 Vdc
8.0 Vdc ≤ Vin ≤ 25 Vdc
5.0 mA ≤ IO ≤ 1.0 A
∆IB–
–
–
–
–
–
–
1.3
0.5
–
–
–
–
–
–
1.3
–
0.5
mA
Ripple Rejection
8.0 Vdc ≤ Vin ≤ 18 Vdc, f = 120 Hz RR – 68 – – 68 – dB
Dropout Voltage (IO = 1.0 A, TJ = 25°C) VI – VO– 2.0 – – 2.0 – Vdc
Output Noise Voltage (TA = 25°C)
10 Hz ≤ f ≤ 100 kHz Vn– 10 – – 10 – µV/VO
Output Resistance f = 1.0 kHz rO– 0.9 – – 0.9 – mΩ
Short Circuit Current Limit (TA = 25°C)
Vin = 35 Vdc ISC – 0.2 – – 0.2 – A
Peak Output Current (TJ = 25°C) Imax – 2.2 – – 2.2 – A
Average Temperature Coefficient of Output Voltage TCVO– –0.3 – – –0.3 – mV/°C
ELECTRICAL CHARACTERISTICS (Vin = 10 V, IO = 1.0 A, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
MC7805AC
Characteristic Symbol Min Typ Max Unit
Output Voltage (TJ = 25°C) VO4.9 5.0 5.1 Vdc
Output Voltage
(5.0 mA ≤ IO ≤ 1.0 A, PD ≤15 W)
7.5 Vdc ≤ Vin ≤ 20 Vdc
VO4.8 5.0 5.2 Vdc
Line Regulation (Note 2)
7.5 Vdc ≤ Vin ≤ 25 Vdc, IO = 500 mA
8.0 Vdc ≤ Vin ≤ 12 Vdc
8.0 Vdc ≤ Vin ≤ 12 Vdc, TJ = 25°C
7.3 Vdc ≤ Vin ≤ 20 Vdc, TJ = 25°C
Regline –
–
–
–
5.0
1.3
1.3
4.5
50
50
25
50
mV
Load Regulation (Note 2)
5.0 mA ≤ IO ≤ 1.5 A, TJ = 25°C
5.0 mA ≤ IO ≤ 1.0 A
250 mA ≤ IO ≤ 750 mA
Regload –
–
–
1.3
0.8
0.15
100
100
50
mV
Quiescent Current
(TJ = 25°C) IB–
––
3.2 6.0
6.0 mA
Quiescent Current Change
8.0 Vdc ≤ Vin ≤ 25 Vdc, IO = 500 mA
7.5 Vdc ≤ Vin ≤ 20 Vdc, TJ = 25°C
5.0 mA ≤ IO ≤ 1.0 A
∆IB–
–
–
–
–
–
0.8
0.8
0.5
mA
NOTES: 1. Tlow = 0°C for MC78XXAC, C Thigh = +125°C for MC78XXAC, C, B
= –40°C for MC78XXB
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.
MC7800 Series
4MOTOROLA ANALOG IC DEVICE DATA
ELECTRICAL CHARACTERISTICS (continued) (Vin = 10 V, IO = 1.0 A, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
MC7805AC
Characteristic Symbol Min Typ Max Unit
Ripple Rejection
8.0 Vdc ≤ Vin ≤ 18 Vdc, f = 120 Hz, IO = 500 mA RR – 68 – dB
Dropout Voltage (IO = 1.0 A, TJ = 25°C) VI – VO– 2.0 – Vdc
Output Noise Voltage (TA = 25°C)
10 Hz ≤ f ≤ 100 kHz Vn– 10 – µV/VO
Output Resistance (f = 1.0 kHz) rO– 0.9 – mΩ
Short Circuit Current Limit (TA = 25°C)
Vin = 35 Vdc ISC – 0.2 – A
Peak Output Current (TJ = 25°C) Imax – 2.2 – A
Average Temperature Coefficient of Output Voltage TCVO– –0.3 – mV/°C
ELECTRICAL CHARACTERISTICS (Vin = 11 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
MC7806B MC7806C
Characteristic Symbol Min Typ Max Min Typ Max Unit
Output Voltage (TJ = 25°C) VO5.75 6.0 6.25 5.75 6.0 6.25 Vdc
Output Voltage
(5.0 mA ≤ IO ≤ 1.0 A, PD ≤15 W)
8.0 Vdc ≤ Vin ≤ 21 Vdc
9.0 Vdc ≤ Vin ≤ 21 Vdc
VO
–
5.7 –
6.0 –
6.3 5.7
–6.0
–6.3
–
Vdc
Line Regulation, TJ = 25°C (Note 2)
8.0 Vdc ≤ Vin ≤ 25 Vdc
9.0 Vdc ≤ Vin ≤ 13 Vdc
Regline –
–5.5
1.4 120
60 –
–5.5
1.4 120
60
mV
Load Regulation, TJ = 25°C (Note 2)
5.0 mA ≤ IO ≤ 1.5 A
250 mA ≤ IO ≤ 750 mA
Regload –
–1.3
0.2 120
60 –
–1.3
0.2 120
60
mV
Quiescent Current (TJ = 25°C) IB– 3.3 8.0 – 3.3 8.0 mA
Quiescent Current Change
8.0 Vdc ≤ Vin ≤ 25 Vdc
9.0 Vdc ≤ Vin ≤ 25 Vdc
5.0 mA ≤ IO ≤ 1.0 A
∆IB–
–
–
–
–
–
–
1.3
0.5
–
–
–
–
–
–
1.3
–
0.5
mA
Ripple Rejection
9.0 Vdc ≤ Vin ≤ 19 Vdc, f = 120 Hz RR – 65 – – 65 – dB
Dropout Voltage (IO = 1.0 A, TJ = 25°C) VI – VO– 2.0 – – 2.0 – Vdc
Output Noise Voltage (TA = 25°C)
10 Hz ≤ f ≤ 100 kHz Vn– 10 – – 10 – µV/VO
Output Resistance f = 1.0 kHz rO– 0.9 – – 0.9 – mΩ
Short Circuit Current Limit (TA = 25°C)
Vin = 35 Vdc ISC – 0.2 – – 0.2 – A
Peak Output Current (TJ = 25°C) Imax – 2.2 – – 2.2 – A
Average Temperature Coefficient of Output Voltage TCVO– –0.3 – – –0.3 – mV/°C
NOTES: 1. Tlow = 0°C for MC78XXAC, C Thigh = +125°C for MC78XXAC, C, B
= –40°C for MC78XXB
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.
MC7800 Series
5
MOTOROLA ANALOG IC DEVICE DATA
ELECTRICAL CHARACTERISTICS (Vin = 11 V, IO = 1.0 A, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
MC7806AC
Characteristic Symbol Min Typ Max Unit
Output Voltage (TJ = 25°C) VO5.88 6.0 6.12 Vdc
Output Voltage
(5.0 mA ≤ IO ≤ 1.0 A, PD ≤15 W)
8.6 Vdc ≤ Vin ≤ 21 Vdc
VO5.76 6.0 6.24 Vdc
Line Regulation (Note 2)
8.6 Vdc ≤ Vin ≤ 25 Vdc, IO = 500 mA
9.0 Vdc ≤ Vin ≤ 13 Vdc
9.0 Vdc ≤ Vin ≤ 13 Vdc, TJ = 25°C
8.3 Vdc ≤ Vin ≤ 21 Vdc, TJ = 25°C
Regline –
–
–
–
5.0
1.4
1.4
4.5
60
60
30
60
mV
Load Regulation (Note 2)
5.0 mA ≤ IO ≤ 1.5 A, TJ = 25°C
5.0 mA ≤ IO ≤ 1.0 A
250 mA ≤ IO ≤ 750 mA
Regload –
–
–
1.3
0.9
0.2
100
100
50
mV
Quiescent Current
TJ = 25°CIB–
––
3.3 6.0
6.0 mA
Quiescent Current Change
9.0 Vdc ≤ Vin ≤ 25 Vdc, IO = 500 mA
8.6 Vdc ≤ Vin ≤ 21 Vdc, TJ = 25°C
5.0 mA ≤ IO ≤ 1.0 A
∆IB–
–
–
–
–
–
0.8
0.8
0.5
mA
Ripple Rejection
9.0 Vdc ≤ Vin ≤ 19 Vdc, f = 120 Hz, IO = 500 mA RR – 65 – dB
Dropout Voltage (IO = 1.0 A, TJ = 25°C) VI – VO– 2.0 – Vdc
Output Noise Voltage (TA = 25°C)
10 Hz ≤ f ≤ 100 kHz Vn– 10 – µV/VO
Output Resistance (f = 1.0 kHz) rO– 0.9 – mΩ
Short Circuit Current Limit (TA = 25°C)
Vin = 35 Vdc ISC – 0.2 – A
Peak Output Current (TJ = 25°C) Imax – 2.2 – A
Average Temperature Coefficient of Output Voltage TCVO– –0.3 – mV/°C
ELECTRICAL CHARACTERISTICS (Vin = 14 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
MC7808B MC7808C
Characteristic Symbol Min Typ Max Min Typ Max Unit
Output Voltage (TJ = 25°C) VO7.7 8.0 8.3 7.7 8.0 8.3 Vdc
Output Voltage
(5.0 mA ≤ IO ≤ 1.0 A, PD ≤15 W)
10.5 Vdc ≤ Vin ≤ 23 Vdc
11.5 Vdc ≤ Vin ≤ 23 Vdc
VO
–
7.6 –
8.0 –
8.4 7.6
–8.0
–8.4
–
Vdc
Line Regulation, TJ = 25°C, (Note 2)
10.5 Vdc ≤ Vin ≤ 25 Vdc
11 Vdc ≤ Vin ≤ 17 Vdc
Regline –
–6.0
1.7 160
80 –
–6.0
1.7 160
80
mV
Load Regulation, TJ = 25°C (Note 2)
5.0 mA ≤ IO ≤ 1.5 A
250 mA ≤ IO ≤ 750 mA
Regload –
–1.4
.22 160
80 –
–1.4
.22 160
80
mV
Quiescent Current (TJ = 25°C) IB– 3.3 8.0 – 3.3 8.0 mA
NOTES: 1. Tlow = 0°C for MC78XXAC, C Thigh = +125°C for MC78XXAC, C, B
= –40°C for MC78XXB
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.
MC7800 Series
6MOTOROLA ANALOG IC DEVICE DATA
ELECTRICAL CHARACTERISTICS (continued) (Vin = 14 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
MC7808B MC7808C
Characteristic Symbol Min Typ Max Min Typ Max Unit
Quiescent Current Change
10.5 Vdc ≤ Vin ≤ 25 Vdc
11.5 Vdc ≤ Vin ≤ 25 Vdc
5.0 mA ≤ IO ≤ 1.0 A
∆IB–
–
–
–
–
–
–
1.0
0.5
–
–
–
–
–
–
1.0
–
0.5
mA
Ripple Rejection
11.5 Vdc ≤ Vin ≤ 18 Vdc, f = 120 Hz RR – 62 – – 62 – dB
Dropout Voltage (IO = 1.0 A, TJ = 25°C) VI – VO– 2.0 – – 2.0 – Vdc
Output Noise Voltage (TA = 25°C)
10 Hz ≤ f ≤ 100 kHz Vn– 10 – – 10 – µV/VO
Output Resistance f = 1.0 kHz rO– 0.9 – – 0.9 – mΩ
Short Circuit Current Limit (TA = 25°C)
Vin = 35 Vdc ISC – 0.2 – – 0.2 – A
Peak Output Current (TJ = 25°C) Imax – 2.2 – – 2.2 – A
Average Temperature Coefficient of Output Voltage TCVO– –0.4 – – –0.4 – mV/°C
ELECTRICAL CHARACTERISTICS (Vin = 14 V, IO = 1.0 A, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
MC7808AC
Characteristic Symbol Min Typ Max Unit
Output Voltage (TJ = 25°C) VO7.84 8.0 8.16 Vdc
Output Voltage
(5.0 mA ≤ IO ≤ 1.0 A, PD ≤15 W)
10.6 Vdc ≤ Vin ≤ 23 Vdc
VO7.7 8.0 8.3 Vdc
Line Regulation (Note 2)
10.6 Vdc ≤ Vin ≤ 25 Vdc, IO = 500 mA
11 Vdc ≤ Vin ≤ 17 Vdc
11 Vdc ≤ Vin ≤ 17 Vdc, TJ = 25°C
10.4 Vdc ≤ Vin ≤ 23 Vdc, TJ = 25°C
Regline –
–
–
–
6.0
1.7
1.7
5.0
80
80
40
80
mV
Load Regulation (Note 2)
5.0 mA ≤ IO ≤ 1.5 A, TJ = 25°C
5.0 mA ≤ IO ≤ 1.0 A
250 mA ≤ IO ≤ 750 mA
Regload –
–
–
1.4
1.0
.22
100
100
50
mV
Quiescent Current
TJ = 25°CIB–
––
3.3 6.0
6.0 mA
Quiescent Current Change
11 Vdc ≤ Vin ≤ 25 Vdc, IO = 500 mA
10.6 Vdc ≤ Vin ≤ 20 Vdc, TJ = 25°C
5.0 mA ≤ IO ≤ 1.0 A
∆IB–
–
–
–
–
–
0.8
0.8
0.5
mA
Ripple Rejection
11.5 Vdc ≤ Vin ≤ 21.5 Vdc, f = 120 Hz, IO = 500 mA RR – 62 – dB
Dropout Voltage (IO = 1.0 A, TJ = 25°C) VI – VO– 2.0 – Vdc
Output Noise Voltage (TA = 25°C)
10 Hz ≤ f ≤ 100 kHz Vn– 10 – µV/VO
Output Resistance f = 1.0 kHz rO– 0.9 – mΩ
Short Circuit Current Limit (TA = 25°C)
Vin = 35 Vdc ISC – 0.2 – A
Peak Output Current (TJ = 25°C) Imax – 2.2 – A
Average Temperature Coefficient of Output Voltage TCVO– –0.4 – mV/°C
NOTES: 1. Tlow = 0°C for MC78XXAC, C Thigh = +125°C for MC78XXAC, C, B
= –40°C for MC78XXB
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.
MC7800 Series
7
MOTOROLA ANALOG IC DEVICE DATA
ELECTRICAL CHARACTERISTICS (Vin = 15 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
MC7809CT
Characteristic Symbol Min Typ Max Unit
Output Voltage (TJ = 25°C) VO8.65 9.0 9.35 Vdc
Output Voltage
(5.0 mA ≤ IO ≤ 1.0 A, PD ≤15 W)
11.5 Vdc ≤ Vin ≤ 24 Vdc
VO8.55 9.0 9.45 Vdc
Line Regulation, TJ = 25°C (Note 2)
11.5 Vdc ≤ Vin ≤ 26 Vdc
11.5 Vdc ≤ Vin ≤ 17 Vdc
Regline –
–6.2
1.8 50
25
mV
Load Regulation, TJ = 25°C (Note 2)
5.0 mA ≤ IO ≤ 1.5 A
250 mA ≤ IO ≤ 750 mA
Regload –
–1.5
0.3 50
25
mV
Quiescent Current (TJ = 25°C) IB– 3.4 8.0 mA
Quiescent Current Change
11.5 Vdc ≤ Vin ≤ 26 Vdc
5.0 mA ≤ IO ≤ 1.0 A
∆IB–
––
–1.0
0.5
mA
Ripple Rejection
11.5 Vdc ≤ Vin ≤ 21.5 Vdc, f = 120 Hz RR – 61 – dB
Dropout Voltage (IO = 1.0 A, TJ = 25°C) VI – VO– 2.0 – Vdc
Output Noise Voltage (TA = 25°C)
10 Hz ≤ f ≤ 100 kHz Vn– 10 – µV/VO
Output Resistance f = 1.0 kHz rO– 1.0 – mΩ
Short Circuit Current Limit (TA = 25°C)
Vin = 35 Vdc ISC – 0.2 – A
Peak Output Current (TJ = 25°C) Imax – 2.2 – A
Average Temperature Coefficient of Output Voltage TCVO– –0.5 – mV/°C
ELECTRICAL CHARACTERISTICS (Vin = 19 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
MC7812B MC7812C
Characteristic Symbol Min Typ Max Min Typ Max Unit
Output Voltage (TJ = 25°C) VO11.5 12 12.5 11.5 12 12.5 Vdc
Output Voltage
(5.0 mA ≤ IO ≤ 1.0 A, PD ≤15 W)
14.5 Vdc ≤ Vin ≤ 27 Vdc
15.5 Vdc ≤ Vin ≤ 27 Vdc
VO
–
11.4 –
12 –
12.6 11.4
–12
–12.6
–
Vdc
Line Regulation, TJ = 25°C (Note 2)
14.5 Vdc ≤ Vin ≤ 30 Vdc
16 Vdc ≤ Vin ≤ 22 Vdc
Regline –
–7.5
2.2 240
120 –
–7.5
2.2 240
120
mV
Load Regulation, TJ = 25°C (Note 2)
5.0 mA ≤ IO ≤ 1.5 A
250 mA ≤ IO ≤ 750 mA
Regload –
–1.6
1.0 240
120 –
–1.6
1.0 240
120
mV
Quiescent Current (TJ = 25°C) IB– 3.4 8.0 – 3.4 8.0 mA
Quiescent Current Change
14.5 Vdc ≤ Vin ≤ 30 Vdc
15 Vdc ≤ Vin ≤ 30 Vdc
5.0 mA ≤ IO ≤ 1.0 A
∆IB–
–
–
–
–
–
–
1.0
0.5
–
–
–
–
–
–
1.0
–
0.5
mA
Ripple Rejection
15 Vdc ≤ Vin ≤ 25 Vdc, f = 120 Hz RR – 60 – – 60 – dB
Dropout Voltage (IO = 1.0 A, TJ = 25°C) VI – VO– 2.0 – – 2.0 – Vdc
NOTES: 1. Tlow = 0°C for MC78XXAC, C Thigh = +125°C for MC78XXAC, C, B
= –40°C for MC78XXB
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.
MC7800 Series
8MOTOROLA ANALOG IC DEVICE DATA
ELECTRICAL CHARACTERISTICS (continued) (Vin = 19 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
MC7812B MC7812C
Characteristic Symbol Min Typ Max Min Typ Max Unit
Output Noise Voltage (TA = 25°C)
10 Hz ≤ f ≤ 100 kHz Vn– 10 – – 10 – µV/VO
Output Resistance f = 1.0 kHz rO– 1.1 – – 1.1 – mΩ
Short Circuit Current Limit (TA = 25°C)
Vin = 35 Vdc ISC – 0.2 – – 0.2 – A
Peak Output Current (TJ = 25°C) Imax – 2.2 – – 2.2 – A
Average Temperature Coefficient of Output Voltage TCVO– –0.8 – – –0.8 – mV/°C
ELECTRICAL CHARACTERISTICS (Vin = 19 V, IO = 10 A, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
MC7812AC
Characteristic Symbol Min Typ Max Unit
Output Voltage (TJ = 25°C) VO11.75 12 12.25 Vdc
Output Voltage
(5.0 mA ≤ IO ≤ 1.0 A, PD ≤15 W)
14.8 Vdc ≤ Vin ≤ 27 Vdc
VO11.5 12 12.5 Vdc
Line Regulation (Note 2)
14.8 Vdc ≤ Vin ≤ 30 Vdc, IO = 500 mA
16 Vdc ≤ Vin ≤ 22 Vdc
16 Vdc ≤ Vin ≤ 22 Vdc, TJ = 25°C
14.5 Vdc ≤ Vin ≤ 27 Vdc, TJ = 25°C
Regline –
–
–
–
7.5
2.2
2.2
6.0
120
120
60
120
mV
Load Regulation (Note 2)
5.0 mA ≤ IO ≤ 1.5 A, TJ = 25°C
5.0 mA ≤ IO ≤ 1.0 A
250 mA ≤ IO ≤ 750 mA
Regload –
–
–
1.6
1.2
1.0
100
100
50
mV
Quiescent Current
TJ = 25°CIB–
––
3.4 6.0
6.0 mA
Quiescent Current Change
15 Vdc ≤ Vin ≤ 30 Vdc, IO = 500 mA
14.8 Vdc ≤ Vin ≤ 27 Vdc, TJ = 25°C
5.0 mA ≤ IO ≤ 1.0 A
∆IB–
–
–
–
–
–
0.8
0.8
0.5
mA
Ripple Rejection
15 Vdc ≤ Vin ≤ 25 Vdc, f = 120 Hz, IO = 500 mA RR – 60 – dB
Dropout Voltage (IO = 1.0 A, TJ = 25°C) VI – VO– 2.0 – Vdc
Output Noise Voltage (TA = 25°C)
10 Hz ≤ f ≤ 100 kHz Vn– 10 – µV/VO
Output Resistance (f = 1.0 kHz) rO– 1.1 – mΩ
Short Circuit Current Limit (TA = 25°C)
Vin = 35 Vdc ISC – 0.2 – A
Peak Output Current (TJ = 25°C) Imax – 2.2 – A
Average Temperature Coefficient of Output Voltage TCVO– –0.8 – mV/°C
NOTES: 1. Tlow = 0°C for MC78XXAC, C Thigh = +125°C for MC78XXAC, C, B
= –40°C for MC78XXB
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.
MC7800 Series
9
MOTOROLA ANALOG IC DEVICE DATA
ELECTRICAL CHARACTERISTICS (Vin = 23 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
MC7815B MC7815C
Characteristic Symbol Min Typ Max Min Typ Max Unit
Output Voltage (TJ = 25°C) VO14.4 15 15.6 14.4 15 15.6 Vdc
Output Voltage
(5.0 mA ≤ IO ≤ 1.0 A, PD ≤15 W)
17.5 Vdc ≤ Vin ≤ 30 Vdc
18.5 Vdc ≤ Vin ≤ 30 Vdc
VO
–
14.25 –
15 –
15.75 14.25
–15
–15.75
–
Vdc
Line Regulation, TJ = 25°C (Note 2)
17.5 Vdc ≤ Vin ≤ 30 Vdc
20 Vdc ≤ Vin ≤ 26 Vdc
Regline –
–8.5
3.0 300
150 –
–8.5
3.0 300
150
mV
Load Regulation, TJ = 25°C (Note 2)
5.0 mA ≤ IO ≤ 1.5 A
250 mA ≤ IO ≤ 750 mA
Regload –
–1.8
1.2 300
150 –
–1.8
1.2 300
150
mV
Quiescent Current (TJ = 25°C) IB– 3.5 8.0 – 3.5 8.0 mA
Quiescent Current Change
17.5 Vdc ≤ Vin ≤ 30 Vdc
18.5 Vdc ≤ Vin ≤ 30 Vdc
5.0 mA ≤ IO ≤ 1.0 A
∆IB–
–
–
–
–
–
–
1.0
0.5
–
–
–
–
–
–
1.0
–
0.5
mA
Ripple Rejection
18.5 Vdc ≤ Vin ≤ 28.5 Vdc, f = 120 Hz RR – 58 – – 58 – dB
Dropout Voltage (IO = 1.0 A, TJ = 25°C) VI – VO– 2.0 – – 2.0 – Vdc
Output Noise Voltage (TA = 25°C)
10 Hz ≤ f ≤ 100 kHz Vn– 10 – – 10 – µV/VO
Output Resistance f = 1.0 kHz rO– 1.2 – – 1.2 – mΩ
Short Circuit Current Limit (TA = 25°C)
Vin = 35 Vdc ISC – 0.2 – – 0.2 – A
Peak Output Current (TJ = 25°C) Imax – 2.2 – – 2.2 – A
Average Temperature Coefficient of Output Voltage TCVO– –1.0 – – –1.0 – mV/°C
ELECTRICAL CHARACTERISTICS (Vin = 23 V, IO = 1.0 A, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
MC7815AC
Characteristic Symbol Min Typ Max Unit
Output Voltage (TJ = 25°C) VO14.7 15 15.3 Vdc
Output Voltage
(5.0 mA ≤ IO ≤ 1.0 A, PD ≤15 W)
17.9 Vdc ≤ Vin ≤ 30 Vdc
VO14.4 15 15.6 Vdc
Line Regulation (Note 2)
17.9 Vdc ≤ Vin ≤ 30 Vdc, IO = 500 mA
20 Vdc ≤ Vin ≤ 26 Vdc
20 Vdc ≤ Vin ≤ 26 Vdc, TJ = 25°C
17.5 Vdc ≤ Vin ≤ 30 Vdc, TJ = 25°C
Regline –
–
–
–
8.5
3.0
3.0
7.0
150
150
75
150
mV
Load Regulation (Note 2)
5.0 mA ≤ IO ≤ 1.5 A, TJ = 25°C
5.0 mA ≤ IO ≤ 1.0 A
250 mA ≤ IO ≤ 750 mA
Regload –
–
–
1.8
1.5
1.2
100
100
50
mV
Quiescent Current
TJ = 25°CIB–
––
3.5 6.0
6.0 mA
Quiescent Current Change
17.5 Vdc ≤ Vin ≤ 30 Vdc, IO = 500 mA
17.5 Vdc ≤ Vin ≤ 30 Vdc, TJ = 25°C
5.0 mA ≤ IO ≤ 1.0 A
∆IB–
–
–
–
–
–
0.8
0.8
0.5
mA
NOTES: 1. Tlow = 0°C for MC78XXAC, C Thigh = +125°C for MC78XXAC, C, B
= –40°C for MC78XXB
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.
MC7800 Series
10 MOTOROLA ANALOG IC DEVICE DATA
ELECTRICAL CHARACTERISTICS (continued) (Vin = 23 V, IO = 1.0 A, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
MC7815AC
Characteristic Symbol Min Typ Max Unit
Ripple Rejection
18.5 Vdc ≤ Vin ≤ 28.5 Vdc, f = 120 Hz, IO = 500 mA RR – 58 – dB
Dropout Voltage (IO = 1.0 A, TJ = 25°C) VI – VO– 2.0 – Vdc
Output Noise Voltage (TA = 25°C)
10 Hz ≤ f ≤ 100 kHz Vn– 10 – µV/VO
Output Resistance f = 1.0 kHz rO– 1.2 – mΩ
Short Circuit Current Limit (TA = 25°C)
Vin = 35 Vdc ISC – 0.2 – A
Peak Output Current (TJ = 25°C) Imax – 2.2 – A
Average Temperature Coefficient of Output Voltage TCVO– –1.0 – mV/°C
ELECTRICAL CHARACTERISTICS (Vin = 27 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
MC7818B MC7818C
Characteristic Symbol Min Typ Max Min Typ Max Unit
Output Voltage (TJ = 25°C) VO17.3 18 18.7 17.3 18 18.7 Vdc
Output Voltage
(5.0 mA ≤ IO ≤ 1.0 A, PD ≤15 W)
21 Vdc ≤ Vin ≤ 33 Vdc
22 Vdc ≤ Vin ≤ 33 Vdc
VO
–
17.1 –
18 –
18.9 17.1
–18
–18.9
–
Vdc
Line Regulation, TJ = 25°C (Note 2)
21 Vdc ≤ Vin ≤ 33 Vdc
24 Vdc ≤ Vin ≤ 30 Vdc
Regline –
–9.5
3.2 360
180 –
–9.5
3.2 360
180
mV
Load Regulation, TJ = 25°C (Note 2)
5.0 mA ≤ IO ≤ 1.5 A
250 mA ≤ IO ≤ 750 mA
Regload –
–2.0
1.5 360
180 –
–2.0
1.5 360
180
mV
Quiescent Current (TJ = 25°C) IB– 3.5 8.0 – 3.5 8.0 mA
Quiescent Current Change
21 Vdc ≤ Vin ≤ 33 Vdc
22 Vdc ≤ Vin ≤ 33 Vdc
5.0 mA ≤ IO ≤ 1.0 A
∆IB–
–
–
–
–
–
–
1.0
0.5
–
–
–
–
–
–
1.0
–
0.5
mA
Ripple Rejection
22 Vdc ≤ Vin ≤ 33 Vdc, f = 120 Hz RR – 57 – – 57 – dB
Dropout Voltage (IO = 1.0 A, TJ = 25°C) ViI – VO– 2.0 – – 2.0 – Vdc
Output Noise Voltage (TA = 25°C)
10 Hz ≤ f ≤ 100 kHz Vn– 10 – – 10 – µV/VO
Output Resistance f = 1.0 kHz rO– 1.3 – – 1.3 – mΩ
Short Circuit Current Limit (TA = 25°C)
Vin = 35 Vdc ISC – 0.2 – – 0.2 – A
Peak Output Current (TJ = 25°C) Imax – 2.2 – – 2.2 – A
Average Temperature Coefficient of Output Voltage TCVO– –1.5 – – –1.5 – mV/°C
NOTES: 1. Tlow = 0°C for MC78XXAC, C Thigh = +125°C for MC78XXAC, C, B
= –40°C for MC78XXB
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.
MC7800 Series
11
MOTOROLA ANALOG IC DEVICE DATA
ELECTRICAL CHARACTERISTICS (Vin = 27 V, IO = 10 A, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
MC7818AC
Characteristic Symbol Min Typ Max Unit
Output Voltage (TJ = 25°C) VO17.64 18 18.36 Vdc
Output Voltage
(5.0 mA ≤ IO ≤ 1.0 A, PD ≤15 W)
21 Vdc ≤ Vin ≤ 33 Vdc
VO17.3 18 18.7 Vdc
Line Regulation (Note 2)
21 Vdc ≤ Vin ≤ 33 Vdc, IO = 500 mA
24 Vdc ≤ Vin ≤ 30 Vdc
24 Vdc ≤ Vin ≤ 30 Vdc, TJ = 25°C
20.6 Vdc ≤ Vin ≤ 33 Vdc, TJ = 25°C
Regline –
–
–
–
9.5
3.2
3.2
8.0
180
180
90
180
mV
Load Regulation (Note 2)
5.0 mA ≤ IO ≤ 1.5 A, TJ = 25°C
5.0 mA ≤ IO ≤ 1.0 A
250 mA ≤ IO ≤ 750 mA
Regload –
–
–
2.0
1.8
1.5
100
100
50
mV
Quiescent Current
TJ = 25°CIB–
––
3.5 6.0
6.0 mA
Quiescent Current Change
21 Vdc ≤ Vin ≤ 33 Vdc, IO = 500 mA
21 Vdc ≤ Vin ≤ 33 Vdc, TJ = 25°C
5.0 mA ≤ IO ≤ 1.0 A
∆IB–
–
–
–
–
–
0.8
0.8
0.5
mA
Ripple Rejection
22 Vdc ≤ Vin ≤ 32 Vdc, f = 120 Hz, IO = 500 mA RR – 57 – dB
Dropout Voltage (IO = 1.0 A, TJ = 25°C) VI – VO– 2.0 – Vdc
Output Noise Voltage (TA = 25°C)
10 Hz ≤ f ≤ 100 kHz Vn– 10 – µV/VO
Output Resistance f = 1.0 kHz rO– 1.3 – mΩ
Short Circuit Current Limit (TA = 25°C)
Vin = 35 Vdc ISC – 0.2 – A
Peak Output Current (TJ = 25°C) Imax – 2.2 – A
Average Temperature Coefficient of Output Voltage TCVO– –1.5 – mV/°C
ELECTRICAL CHARACTERISTICS (Vin = 33 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
MC7824B MC7824C
Characteristic Symbol Min Typ Max Min Typ Max Unit
Output Voltage (TJ = 25°C) VO23 24 25 23 24 25 Vdc
Output Voltage
(5.0 mA ≤ IO ≤ 1.0 A, PD ≤15 W)
27 Vdc ≤ Vin ≤ 38 Vdc
28 Vdc ≤ Vin ≤ 38 Vdc
VO
–
22.8 –
24 –
25.2 22.8
–24
–25.2
–
Vdc
Line Regulation, TJ = 25°C (Note 2)
27 Vdc ≤ Vin ≤ 38 Vdc
30 Vdc ≤ Vin ≤ 36 Vdc
Regline –
–11.5
3.8 480
240 –
–11.5
3.8 480
240
mV
Load Regulation, TJ = 25°C (Note 2)
5.0 mA ≤ IO ≤ 1.5 A
250 mA ≤ IO ≤ 750 mA
Regload –
–2.1
1.8 480
240 –
–2.1
1.8 480
240
mV
Quiescent Current (TJ = 25°C) IB– 3.6 8.0 – 3.6 8.0 mA
NOTES: 1. Tlow = 0°C for MC78XXAC, C Thigh = +125°C for MC78XXAC, C, B
= –40°C for MC78XXB
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.
MC7800 Series
12 MOTOROLA ANALOG IC DEVICE DATA
ELECTRICAL CHARACTERISTICS (continued) (Vin = 33 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
MC7824B MC7824C
Characteristic Symbol Min Typ Max Min Typ Max Unit
Quiescent Current Change
27 Vdc ≤ Vin ≤ 38 Vdc
28 Vdc ≤ Vin ≤ 38 Vdc
5.0 mA ≤ IO ≤ 1.0 A
∆IB–
–
–
–
–
–
–
1.0
0.5
–
–
–
–
–
–
1.0
–
0.5
mA
Ripple Rejection
28 Vdc ≤ Vin ≤ 38 Vdc, f = 120 Hz RR – 54 – – 54 – dB
Dropout Voltage (IO = 1.0 A, TJ = 25°C) VI – VO– 2.0 – – 2.0 – Vdc
Output Noise Voltage (TA = 25°C)
10 Hz ≤ f ≤ 100 kHz Vn– 10 – – 10 – µV/VO
Output Resistance f = 1.0 kHz rO– 1.4 – – 1.4 – mΩ
Short Circuit Current Limit (TA = 25°C)
Vin = 35 Vdc ISC – 0.2 – – 0.2 – A
Peak Output Current (TJ = 25°C) Imax – 2.2 – – 2.2 – A
Average Temperature Coefficient of Output Voltage TCVO– –2.0 – – –2.0 – mV/°C
ELECTRICAL CHARACTERISTICS (Vin = 33 V, IO = 1.0 A, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
MC7824AC
Characteristic Symbol Min Typ Max Unit
Output Voltage (TJ = 25°C) VO23.5 24 24.5 Vdc
Output Voltage
(5.0 mA ≤ IO ≤ 1.0 A, PD ≤15 W)
27.3 Vdc ≤ Vin ≤ 38 Vdc
VO23 24 25 Vdc
Line Regulation (Note 2)
27 Vdc ≤ Vin ≤ 38 Vdc, IO = 500 mA
30 Vdc ≤ Vin ≤ 36 Vdc
30 Vdc ≤ Vin ≤ 36 Vdc, TJ = 25°C
26.7 Vdc ≤ Vin ≤ 38 Vdc, TJ = 25°C
Regline –
–
–
–
11.5
3.8
3.8
10
240
240
120
240
mV
Load Regulation (Note 2)
5.0 mA ≤ IO ≤ 1.5 A, TJ = 25°C
5.0 mA ≤ IO ≤ 1.0 A
250 mA ≤ IO ≤ 750 mA
Regload –
–
–
2.1
2.0
1.8
100
100
50
mV
Quiescent Current
TJ = 25°CIB–
––
3.6 6.0
6.0 mA
Quiescent Current Change
27.3 Vdc ≤ Vin ≤ 38 Vdc, IO = 500 mA
27.3 Vdc ≤ Vin ≤ 38 Vdc, TJ = 25°C
5.0 mA ≤ IO ≤ 1.0 A
∆IB–
–
–
–
–
–
0.8
0.8
0.5
mA
Ripple Rejection
28 Vdc ≤ Vin ≤ 38 Vdc, f = 120 Hz, IO = 500 mA RR – 54 – dB
Dropout Voltage (IO = 1.0 A, TJ = 25°C) VI – VO– 2.0 – Vdc
Output Noise Voltage (TA = 25°C)
10 Hz ≤ f ≤ 100 kHz Vn– 10 – µV/VO
Output Resistance (f = 1.0 kHz) rO– 1.4 – mΩ
Short Circuit Current Limit (TA = 25°C)
Vin = 35 Vdc ISC – 0.2 – A
Peak Output Current (TJ = 25°C) Imax – 2.2 – A
Average Temperature Coefficient of Output Voltage TCVO– –2.0 – mV/°C
NOTES: 1. Tlow = 0°C for MC78XXAC, C Thigh = +125°C for MC78XXAC, C, B
= –40°C for MC78XXB
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.
MC7800 Series
13
MOTOROLA ANALOG IC DEVICE DATA
Figure 1. Peak Output Current as a Function of
Input/Output Differential Voltage (MC78XXC, AC, B) Figure 2. Ripple Rejection as a Function of
Output Voltages (MC78XXC, AC)
Figure 3. Ripple Rejection as a Function of
Frequency (MC78XXC, AC) Figure 4. Output Voltage as a Function of
Junction Temperature (MC7805C, AC, B)
Figure 5. Output Impedance as a Function of
Output Voltage (MC78XXC, AC) Figure 6. Quiescent Current as a Function of
Temperature (MC78XXC, AC, B)
IO
Vin–Vout, INPUT/OUPUT VOLTAGE DIFFERENTIAL (V)
3.0
2.0
1.5
1.0
04.0 8.0 12 20 30 40
, OUTPUT CURRENT (A)
80
70
60
50
40
4.0 6.0 8.0 10 12 14 16 18 20 22 24
VO, OUTPUT VOLTAGE (V)
RR, RIPPLE REJECTION (dB)
PART # Vin
MC7805C = 10 V
MC7806C = 11 V
MC7808C = 14 V
MC7812C = 19 V
MC7815C = 23 V
MC7818C = 27 V
MC7824C = 33 V
80
50
RR, RIPPLE REJECTION (dB)
0.1 10
f, FREQUENCY (kHz)
0.01
, OUTPUT VOLTAGE (V)
O
5.0
4.9
– 60 – 20 20 60 100 140 180
TJ, JUNCTION TEMPERATURE (
°
C)
V
Vin = 20 V
IO = 5.0 mA
f = 120 Hz
IO = 500 mA
CL = 0
µ
F
, OUTPUT IMPEDANCE (m )
O
Ω
10
5.0
3.0
2.0
1.0
0.5
0.3
0.2
0.1
4.0 8.0 12 16 20 24
VO, OUTPUT VOLTAGE (V)
Z
, QUIESCENT CURRENT (mA)
B
6.0
4.0
3.0
2.0
1.0
0
–75 –50 TJ, JUNCTION TEMPERATURE (
°
C)
–25 0 25 50 75 100 125
I
2.5
0.5
70
40
30
60
4.8
6.0 10 15 25 35
MC78XXB, C, AC
TJ = 85
°C
TJ = 25
°C
1.0
Vin = 8.0 V to 18 V
IO = 500 mA
f = 120 Hz
TA = 25
°
C
f = 120 Hz
IO = 20 mA
∆
Vin = 1.0 V(RMS)
TJ = – 40
°C
Vin = 10 V
VO = 5.0 V
IL = 20 mA
TJ = 125
°C
TJ = 0
°C
MC7800 Series
14 MOTOROLA ANALOG IC DEVICE DATA
APPLICATIONS INFORMATION
Design Considerations
The MC7800 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
Safe–Area 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
high–frequency characteristics to insure stable operation
under all load conditions. A 0.33 µF 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 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 when
connected as above. In order to minimize dissipation the MC7805C is
chosen 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 input
voltage less 7.0 V.
IO = 5.0 V
R+ IB
IB
^
3.2 mA over line and load changes.
Input
0.33
µ
FR
IO
MC7805
Constant
Current to
Grounded
Load
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.
Input MC7805 Output
0.33
µ
F
10 k
MC1741G
7
6
4
1.0 k
VO = 7.0 V to 20 V
VIN = VO
≥
2.0 V
0.1
µ
F
3
2
The MC7800 series can be current boosted with a PNP transistor. The
MJ2955 provides current to 5.0 A. Resistor R in conjunction with the V BE
of the PNP determines when the pass transistor begins conducting; this
circuit is not short circuit proof. Input/output differential voltage minimum is
increased by VBE of the pass transistor.
XX = 2 digits of type number indicating voltage.
MC78XX
Input
Output
R
1.0
µ
F
MJ2955 or Equiv.
1.0
µ
F
The circuit of Figure 9 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 three–terminal regulator. Therefore, a four–ampere
plastic power transistor is specified.
XX = 2 digits of type number indicating voltage.
1.0
µ
F
MC78XX
MJ2955
or Equiv.
Output
RSC
R
2N6049
or Equiv.
≥
10
µ
F
RSource
0.33
µ
FInput
RSource
0.33
µ
F
≥
10
µ
F
MC7800 Series
15
MOTOROLA ANALOG IC DEVICE DATA
Figure 11. Worst Case Power Dissipation versus
Ambient Temperature (Case 221A) Figure 12. Input Output Differential as a Function
of Junction Temperature (MC78XXC, AC, B)
, POWER DISSIPATION (W)
D
20
16
12
8.0
4.0
0
–50 –25 0 25 50 75 100 125 150
TA, AMBIENT TEMPERATURE (
°
C)
P
θ
HS = 0
°
C/W
DIFFERENTIAL (V)
in out, INPUT–OUTPUT VOLTAGE
2.5
2.0
1.5
1.0
0.5
0–75 –50 –25 0 25 50 75 100 125
TJ, JUNCTION TEMPERATURE (
°
C)
– VV
IO = 0 mA
IO = 20 mA
IO = 1.0 A
IO = 500 mA
IO = 200 mA
∆
VO = 2% of VO
– – – Extended Curve for MC78XXB
θ
JC = 5
°
C/W
θ
JA = 65
°
C/W
TJ(max) = 150
°
C
θ
HS = 5
°
C/W
θ
HS = 15
°
C/W
No Heatsink
Figure 13. D2PAK Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
R , THERMAL RESISTANCE
JA
θ
JUNCTION-TO-AIR ( 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
Minimum
Size Pad
2.0 oz. Copper
L
L
ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
ÎÎÎÎ
Free Air
Mounted
Vertically
PD, MAXIMUM POWER DISSIPATION (W)
R
θ
JA
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.
Long Term Stability – Output voltage stability under
accelerated life test conditions with the maximum rated
voltage listed in the devices’ electrical characteristics and
maximum power dissipation.
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 can and do vary in different
applications. 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 .
MC7800 Series
16 MOTOROLA ANALOG IC DEVICE DATA
T SUFFIX
PLASTIC PACKAGE
CASE 221A–06
ISSUE Y
OUTLINE DIMENSIONS
MIN MINMAX MAX
INCHES MILLIMETERS
DIM
A
B
C
D
F
G
H
J
K
L
N
Q
R
S
T
U
V
Z
14.48
9.66
4.07
0.64
3.61
2.42
2.80
0.46
12.70
1.15
4.83
2.54
2.04
1.15
5.97
0.00
1.15
–
15.75
10.28
4.82
0.88
3.73
2.66
3.93
0.64
14.27
1.52
5.33
3.04
2.79
1.39
6.47
1.27
–
2.04
0.570
0.380
0.160
0.025
0.142
0.095
0.110
0.018
0.500
0.045
0.190
0.100
0.080
0.045
0.235
0.000
0.045
–
0.620
0.405
0.190
0.035
0.147
0.105
0.155
0.025
0.562
0.060
0.210
0.120
0.110
0.055
0.255
0.050
–
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–
SEATING
PLANE
CS
T
U
J
R
F
B
Q
H
Z
L
V
G
ND
K
A
4
1 2 3
D2T SUFFIX
PLASTIC PACKAGE
CASE 936–03
(D2PAK)
ISSUE B
5 REF5 REF
A
1 2 3
K
F
B
J
S
H
0.010 (0.254) T
M
D
G
C
E
–T–
MLP
NR
V
U
TERMINAL 4
NOTES:
1 DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 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 FLASH
AND GATE PROTRUSIONS NOT TO EXCEED
0.025 (0.635) MAXIMUM.
DIM
AMIN MAX MIN MAX
MILLIMETERS
0.386 0.403 9.804 10.236
INCHES
B0.356 0.368 9.042 9.347
C0.170 0.180 4.318 4.572
D0.026 0.036 0.660 0.914
E0.045 0.055 1.143 1.397
F0.051 REF 1.295 REF
G0.100 BSC 2.540 BSC
H0.539 0.579 13.691 14.707
J0.125 MAX 3.175 MAX
K0.050 REF 1.270 REF
L0.000 0.010 0.000 0.254
M0.088 0.102 2.235 2.591
N0.018 0.026 0.457 0.660
P0.058 0.078 1.473 1.981
R
S0.116 REF 2.946 REF
U0.200 MIN 5.080 MIN
V0.250 MIN 6.350 MIN
_ _
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