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MC7808C Schematic ( PDF Datasheet ) - Motorola Semiconductors

Teilenummer MC7808C
Beschreibung THREE TERMINAL POSITIVE FIXED VOLTAGE REGULATORS
Hersteller Motorola Semiconductors
Logo Motorola Semiconductors Logo 




Gesamt 16 Seiten
MC7808C Datasheet, Funktion
Order this document by MC7800/D
Three-Terminal Positive
Voltage Regulators
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
Previous Commercial Temperature Range has been Extended to a
Junction Temperature Range of –40°C to +125°C
DEVICE TYPE/NOMINAL OUTPUT VOLTAGE
MC7805AC
LM340AT–5
MC7805C
5.0 V
MC7812C
LM340T–12
MC7815AC
12 V
LM340T–5
MC7806AC
MC7806C
6.0 V
LM340AT–15
MC7815C
LM340T–15
15 V
MC7808AC
MC7808C
8.0 V
MC7818AC
MC7818C
18 V
MC7809C
MC7812AC
LM340AT–12
9.0 V
12 V
MC7824AC
MC7824C
24 V
MC7800,
MC7800A, LM340,
LM340A Series
THREE–TERMINAL
POSITIVE FIXED
VOLTAGE REGULATORS
SEMICONDUCTOR
TECHNICAL DATA
T SUFFIX
PLASTIC PACKAGE
CASE 221A
Heatsink surface
connected to Pin 2.
1
2
3
Pin 1. Input
2. Ground
3. Output
D2T SUFFIX
PLASTIC PACKAGE
CASE 936
(D2PAK)
12
3
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
STANDARD APPLICATION
Input
Cin*
0.33 µF
MC78XX
Output
CO**
ORDERING INFORMATION
Device
Output Voltage
Operating
Tolerance
Temperature Range
Package
MC78XXACT
LM340AT–XX
2%
Insertion Mount
MC78XXACD2T
Surface Mount
MC78XXCT
TJ = –40° to +125°C
Insertion Mount
LM340T–XX
4%
MC78XXCD2T
Surface Mount
XX indicates nominal voltage.
MOTOROLA ANALOG IC DEVICE DATA
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.
© Motorola, Inc. 1997
Rev 5
1






MC7808C Datasheet, Funktion
MC7800, MC7800A, LM340, LM340A Series
ELECTRICAL CHARACTERISTICS (continued) (Vin = 14 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
MC7808C
Characteristic
Symbol Min Typ Max Unit
Output Resistance f = 1.0 kHz
Short Circuit Current Limit (TA = 25°C)
Vin = 35 Vdc
Peak Output Current (TJ = 25°C)
Average Temperature Coefficient of Output Voltage
rO
ISC
Imax
TCVO
– 0.9 – m
– 0.2 – A
– 2.2 – A
– –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)
VO 7.84 8.0 8.16
Output Voltage (5.0 mA IO 1.0 A, PD 15 W)
10.6 Vdc Vin 23 Vdc
Line Regulation (Note 2)
10.6 Vdc Vin 25 Vdc, IO = 500 mA
11 Vdc Vin 17 Vdc, IO = 1.0 A
10.4 Vdc Vin 23 Vdc, TJ = 25°C
VO 7.7 8.0 8.3
Regline
– 6.0 15
– 1.7 18
– 5.0 15
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
Quiescent Current
Regload
1.4 25
– 1.0 25
– 0.22 15
IB – 3.3 6.0
Quiescent Current Change
11 Vdc Vin 25 Vdc, IO = 500 mA
10.6 Vdc Vin 23 Vdc, IO = 1.0 A, TJ = 25°C
5.0 mA IO 1.0 A
Ripple Rejection
11.5 Vdc Vin 21.5 Vdc, f = 120 Hz, IO = 500 mA
Dropout Voltage (IO = 1.0 A, TJ = 25°C)
IB
– – 0.8
– – 0.8
– – 0.5
RR
56 62
VI – VO
2.0
Output Noise Voltage (TA = 25°C)
10 Hz f 100 kHz
Vn – 10 –
Output Resistance f = 1.0 kHz
rO – 0.9 –
Short Circuit Current Limit (TA = 25°C)
Vin = 35 Vdc
Peak Output Current (TJ = 25°C)
ISC
Imax
– 0.2 –
– 2.2 –
Average Temperature Coefficient of Output Voltage
TCVO
– –0.4 –
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 account
separately. Pulse testing with low duty cycle is used.
Vdc
Vdc
mV
mV
mA
mA
dB
Vdc
µV/VO
m
A
A
mV/°C
6 MOTOROLA ANALOG IC DEVICE DATA

6 Page









MC7808C pdf, datenblatt
MC7800, MC7800A, LM340, LM340A Series
ELECTRICAL CHARACTERISTICS (continued) (Vin = 33 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
MC7824C
Characteristic
Symbol Min Typ Max Unit
Ripple Rejection
28 Vdc Vin 38 Vdc, f = 120 Hz
Dropout Voltage (IO = 1.0 A, TJ = 25°C)
Output Noise Voltage (TA = 25°C)
10 Hz f 100 kHz
RR
VI – VO
Vn
50
54
2.0
10
– dB
– Vdc
µV/VO
Output Resistance f = 1.0 kHz
Short Circuit Current Limit (TA = 25°C)
Vin = 35 Vdc
Peak Output Current (TJ = 25°C)
Average Temperature Coefficient of Output Voltage
rO
ISC
Imax
TCVO
– 1.4 – m
– 0.2 – A
– 2.2 – A
– –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)
Output Voltage (5.0 mA IO 1.0 A, PD 15 W)
27.3 Vdc Vin 38 Vdc
Line Regulation (Note 2)
27 Vdc Vin 38 Vdc, IO = 500 mA
30 Vdc Vin 36 Vdc, IO = 1.0 A
30 Vdc Vin 36 Vdc, TJ = 25°C
26.7 Vdc Vin 38 Vdc, IO = 1.0 A, TJ = 25°C
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
Quiescent Current
Quiescent Current Change
27.3 Vdc Vin 38 Vdc, IO = 500 mA
27 Vdc Vin 38 Vdc, TJ = 25°C
5.0 mA IO 1.0 A
Ripple Rejection
28 Vdc Vin 38 Vdc, f = 120 Hz, IO = 500 mA
Dropout Voltage (IO = 1.0 A, TJ = 25°C)
Output Noise Voltage (TA = 25°C)
10 Hz f 100 kHz
VO 23.5 24 24.5 Vdc
VO 23.2 24 25.8 Vdc
Regline
mV
– 11.5 25
– 3.8 28
– 3.8 12
– 10 25
Regload
mV
2.1 15
2.0 25
1.8 15
IB – 3.6 6.0 mA
IB mA
– – 0.8
– – 0.8
– – 0.5
RR
45 54
– dB
VI – VO
2.0
– Vdc
Vn – 10 – µV/VO
Output Resistance (f = 1.0 kHz)
Short Circuit Current Limit (TA = 25°C)
Vin = 35 Vdc
Peak Output Current (TJ = 25°C)
Average Temperature Coefficient of Output Voltage
rO
ISC
Imax
TCVO
– 1.4 – m
– 0.2 – A
– 2.2 – A
– –2.0 – mV/°C
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 account
separately. Pulse testing with low duty cycle is used.
12 MOTOROLA ANALOG IC DEVICE DATA

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