Order this document by MCT7800/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 fixed voltage regulators, these devices can be used with
external components to obtain adjustable voltages and currents.
•
Output Current in Excess of 1.0 A
MCT7800
Series
THREE-TERMINAL
POSITIVE FIXED
VOLTAGE REGULATORS
•
•
•
•
•
•
No External Components Required
Internal Thermal Overload Protection
Internal Short Circuit Current Limiting
Output Transistor Safe-Area Compensation
Output Voltage Offered with a 4% Tolerance
Available in Surface Mount D2PAK and Standard 3-Lead Transistor
Packages
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)
1
2
3
This MCT-prefixed device is intended to be a possible replacement for the similar
device with the MC-prefix. Because the MCT device originates from different source
material, there may be subtle differences in typical parameter values or
characteristic curves. Due to the diversity of potential applications, Motorola can not
assure identical performance in all circuits. Motorola recommends that the
customer qualify the MCT-prefixed device in each potential application.
Input
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
STANDARD APPLICATION
MCT78XX
CO**
Output
DEVICE TYPE/NOMINAL OUTPUT VOLTAGE
MCT7805
MCT7806
MCT7808
MCT7809
5.0 V
6.0 V
8.0 V
9.0 V
MCT7812
MCT7815
MCT7818
MCT7824
12 V
15 V
18 V
24 V
Cin*
0.33
µF
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.
** Some CO is recommended for stability; it does
improve transient response. Values less than
0.1
µF
could cause instability.
©
Motorola, Inc. 1994
Rev 3
ORDERING INFORMATION
Device
MCT78XXBD2T
MCT78XXBT
4%
MCT78XXCD2T
MCT78XXCT
XX indicates nominal voltage.
TJ = 0° to +125°C
Surface Mount
Insertion Mount
TJ = – 40° to +125°C
Output Voltage
Tolerance
Tested Operating
Temperature Range
Package
Surface Mount
Insertion Mount
MOTOROLA
MCT7800
1
MCT7800
MAXIMUM RATINGS
(TA = +25°C, unless otherwise noted.)
Rating
Input Voltage
Power Dissipation
Case 221A
TA = +25°C
Thermal Resistance, Junction-to-Ambient
Thermal Resistance, Junction-to-Case
Case 936 (D2PAK)
TA = +25°C
Thermal Resistance, Junction-to-Ambient
Thermal Resistance, Junction-to-Case
Storage Junction Temperature Range
Operating Junction Temperature
Symbol
VI
Value
35
Unit
Vdc
PD
θ
JA
θ
JC
PD
θ
JA
θ
JC
Tstg
TJ
Internally Limited
65
5.0
Internally Limited
70
5.0
– 65 to +150
+150
W
°C/W
°C/W
W
°C/W
°C/W
°C
°C
Representative Schematic Diagram
Input
100
100
500
100
10 k
240
200
3.3 k
0.3
Output
6.0 k
2.0 k
0.25 k
2.7 k
1.4 k
28 k
30 pF
5.0 k
500
6.0 k
1.0 k
5.0 k
Gnd
This device contains 19 active transistors.
MCT7800
2
MOTOROLA
MCT7800
ELECTRICAL CHARACTERISTICS
(Vin = 10 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
MCT7805B
Characteristics
Output Voltage (TJ = +25°C)
Output Voltage (5.0 mA
≤
IO
≤
1.0 A, PO
≤15
W)
7.0 Vdc
≤
Vin
≤
20 Vdc
8.0 Vdc
≤
Vin
≤
20 Vdc
Line Regulation, TJ = +25°C (Note 2)
7.0 Vdc
≤
Vin
≤
25 Vdc
8.0 Vdc
≤
Vin
≤
12 Vdc
Load Regulation, TJ = +25°C (Note 2)
5.0 mA
≤
Vin
≤
1.5 A
250 mA
≤
Vin
≤
750 mA
Quiescent Current (TJ = +25°C)
Quiescent Current Change
7.0 Vdc
≤
Vin
≤
25 Vdc
8.0 Vdc
≤
Vin
≤
25 Vdc
5.0 mA
≤
IO
≤
1.0 A
Ripple Rejection
8.0 Vdc
≤
Vin
≤
18 Vdc, f = 120 Hz
Dropout Voltage (IO = 1.0 A, TJ = +25°C)
Output Noise Voltage (TA = +25°C)
10 Hz
≤
f
≤
100 kHz
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
Symbol
VO
VO
—
4.75
Regline
—
—
Regload
—
—
IB
∆I
B
—
—
—
RR
—
VI – VO
Vn
—
rO
ISC
—
Imax
TCVO
—
—
0.2
2.2
0.5
—
—
—
—
—
—
0.2
2.2
0.5
—
—
—
A
mV/°C
—
10
1.3
—
—
—
—
10
1.3
—
—
mΩ
A
—
65
2.0
—
—
—
—
65
2.0
—
—
Vdc
µV/V
O
—
—
—
—
1.3
0.5
—
—
—
—
—
—
1.3
—
0.5
dB
—
2.0
1.5
5.5
100
50
8.0
—
—
—
2.0
1.5
5.5
100
50
8.0
mA
mA
7.0
2.0
100
50
—
—
7.0
2.0
100
50
mV
—
5.0
—
5.25
4.75
—
5.0
—
5.25
—
mV
Min
4.8
Typ
5.0
Max
5.2
Min
4.8
MCT7805C
Typ
5.0
Max
5.2
Unit
Vdc
Vdc
ELECTRICAL CHARACTERISTICS
(Vin = 11 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
MCT7806B
Characteristics
Output Voltage (TJ = +25°C)
Output Voltage (5.0 mA
≤
IO
≤
1.0 A, PO
≤15
W)
8.0 Vdc
≤
Vin
≤
21 Vdc
9.0 Vdc
≤
Vin
≤
21 Vdc
Line Regulation, TJ = +25°C (Note 2)
8.0 Vdc
≤
Vin
≤
25 Vdc
9.0 Vdc
≤
Vin
≤
13 Vdc
Load Regulation, TJ = +25°C (Note 2)
5.0 mA
≤
Vin
≤
1.5 A
250 mA
≤
Vin
≤
750 mA
Quiescent Current (TJ = +25°C)
Quiescent Current Change
8.0 Vdc
≤
Vin
≤
25 Vdc
9.0 Vdc
≤
Vin
≤
25 Vdc
5.0 mA
≤
IO
≤
1.0 A
Ripple Rejection
9.0 Vdc
≤
Vin
≤
19 Vdc, f = 120 Hz
NOTES:
1. Tlow = 0°C for MCT78XXC
= – 40°C for MCT78XXB
MCT7806C
Max
6.25
—
6.3
120
60
120
60
8.0
—
1.3
0.5
—
Min
5.75
5.7
—
—
—
—
—
—
—
—
—
—
Typ
6.0
6.0
—
7.0
2.0
2.0
1.5
5.5
—
—
—
65
Max
6.25
6.3
—
mV
120
60
mV
120
60
8.0
1.3
—
0.5
dB
—
mA
mA
Unit
Vdc
Vdc
Symbol
VO
VO
Min
5.75
—
5.7
Typ
6.0
—
6.0
7.0
2.0
2.0
1.5
5.5
—
—
—
65
Regline
—
—
Regload
—
—
IB
∆I
B
—
—
—
RR
—
—
Thigh = +125°C for MCT78XXB, C. When the junction temperature exceeds +125°C, internal current limiting
will reduce the output current to less than 1.0 A at a VI–VO of 15 V or
greater. The MC7800 die will supply more current under the same conditions.
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.
MOTOROLA
MCT7800
3
MCT7800
ELECTRICAL CHARACTERISTICS (continued)
(Vin = 11 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
MCT7806B
Characteristics
Dropout Voltage (IO = 1.0 A, TJ = +25°C)
Output Noise Voltage (TA = +25°C)
10 Hz
≤
f
≤
100 kHz
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
Symbol
VI – VO
Vn
—
rO
ISC
—
Imax
TCVO
—
—
0.2
2.2
– 0.8
—
—
—
—
—
—
0.2
2.2
– 0.8
—
—
—
A
mV/°C
—
10
1.3
—
—
—
—
10
1.3
—
—
mΩ
A
Min
—
Typ
2.0
Max
—
Min
—
MCT7806C
Typ
2.0
Max
—
Unit
Vdc
µV/V
O
ELECTRICAL CHARACTERISTICS
(Vin = 14 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
MCT7808B
Characteristics
Output Voltage (TJ = +25°C)
Output Voltage (5.0 mA
≤
IO
≤
1.0 A, PO
≤15
W)
10.5 Vdc
≤
Vin
≤
23 Vdc
11.5 Vdc
≤
Vin
≤
23 Vdc
Line Regulation, TJ = +25°C (Note 2)
10.5 Vdc
≤
Vin
≤
25 Vdc
11 Vdc
≤
Vin
≤
17 Vdc
Load Regulation, TJ = +25°C (Note 2)
5.0 mA
≤
IO
≤
1.5 A
250 mA
≤
IO
≤
750 mA
Quiescent Current (TJ = +25°C)
Quiescent Current Change
10.5 Vdc
≤
Vin
≤
25 Vdc
11.5 Vdc
≤
Vin
≤
25 Vdc
5.0 mA
≤
IO
≤
1.0 A
Ripple Rejection
11.5 Vdc
≤
Vin
≤
21.5 Vdc, f = 120 Hz
Dropout Voltage (IO = 1.0 A, TJ = +25°C)
Output Noise Voltage (TA = +25°C)
10 Hz
≤
f
≤
100 kHz
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
NOTES:
1. Tlow = 0°C for MCT78XXC
= – 40°C for MCT78XXB
MCT7808C
Max
8.3
—
8.4
160
80
160
80
8.0
—
1.0
0.5
—
—
—
—
—
—
—
Min
7.7
7.6
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
Typ
8.0
8.0
—
7.0
2.0
2.0
1.5
5.5
—
—
—
63
2.0
10
18
0.2
2.2
– 0.8
Max
8.3
8.4
—
mV
160
80
mV
160
80
8.0
1.0
—
0.5
dB
—
—
—
—
—
—
—
A
mV/°C
mΩ
A
Vdc
µV/V
O
mA
mA
Unit
Vdc
Vdc
Symbol
VO
VO
Min
7.7
—
7.6
Typ
8.0
—
8.0
7.0
2.0
2.0
1.5
5.5
—
—
—
63
2.0
10
18
0.2
2.2
– 0.8
Regline
—
—
Regload
—
—
IB
∆I
B
—
—
—
RR
—
VI – VO
Vn
—
rO
ISC
—
Imax
TCVO
—
—
—
—
—
Thigh = +125°C for MCT78XXB, C. When the junction temperature exceeds +125°C, internal current limiting
will reduce the output current to less than 1.0 A at a VI–VO of 15 V or
greater. The MC7800 die will supply more current under the same conditions.
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.
MCT7800
4
MOTOROLA
MCT7800
ELECTRICAL CHARACTERISTICS
(Vin = 15 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
MCT7809B
Characteristics
Output Voltage (TJ = +25°C)
Output Voltage (5.0 mA
≤
IO
≤
1.0 A, PO
≤15
W)
11.5 Vdc
≤
Vin
≤
24 Vdc
12.5 Vdc
≤
Vin
≤
24 Vdc
Line Regulation, TJ = +25°C (Note 2)
11.5 Vdc
≤
Vin
≤
26 Vdc
11.5 Vdc
≤
Vin
≤
17 Vdc
Load Regulation, TJ = +25°C (Note 2)
5.0 mA
≤
IO
≤
1.5 A
250 mA
≤
IO
≤
750 mA
Quiescent Current (TJ = +25°C)
Quiescent Current Change
11.5 Vdc
≤
Vin
≤
26 Vdc
12.5 Vdc
≤
Vin
≤
26 Vdc
5.0 mA
≤
IO
≤
1.0 A
Ripple Rejection
11.5 Vdc
≤
Vin
≤
21.5 Vdc, f = 120 Hz
Dropout Voltage (IO = 1.0 A, TJ = +25°C)
Output Noise Voltage (TA = +25°C)
10 Hz
≤
f
≤
100 kHz
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
Symbol
VO
VO
Min
8.65
—
8.55
Regline
—
—
Regload
—
—
IB
∆I
B
—
—
—
—
RR
—
VI – VO
Vn
rO
ISC
—
Imax
TCVO
—
—
0.2
2.2
–1.0
—
—
—
—
—
—
0.2
2.2
–1.0
—
—
—
A
mV/°C
—
—
—
62
2.0
10
18
—
—
—
—
—
—
—
—
62
2.0
10
18
—
—
—
—
mΩ
A
Vdc
µV/V
O
3.0
2.0
5.5
—
—
—
50
25
8.0
—
1.0
0.5
—
—
—
—
—
—
3.0
2.0
5.5
—
—
—
50
25
8.0
1.0
—
0.5
dB
mA
mA
8.0
4.0
50
25
—
—
8.0
4.0
50
25
mV
Typ
9.0
—
9.0
Max
9.35
—
9.45
Min
8.65
8.55
—
MCT7809C
Typ
9.0
9.0
—
Max
9.35
9.45
—
mV
Unit
Vdc
Vdc
ELECTRICAL CHARACTERISTICS
(Vin = 19 V, IO = 500 mA, TJ = Tlow to Thigh [Note 1], unless otherwise noted.)
MCT7812B
Characteristics
Output Voltage (TJ = +25°C)
Output Voltage (5.0 mA
≤
IO
≤
1.0 A, PO
≤15
W)
14.5 Vdc
≤
Vin
≤
27 Vdc
15.5 Vdc
≤
Vin
≤
27 Vdc
Line Regulation, TJ = +25°C (Note 2)
14.5 Vdc
≤
Vin
≤
30 Vdc
16 Vdc
≤
Vin
≤
22 Vdc
Load Regulation, TJ = +25°C (Note 2)
5.0 mA
≤
IO
≤
1.5 A
250 mA
≤
IO
≤
750 mA
Quiescent Current (TJ = +25°C)
Quiescent Current Change
14.5 Vdc
≤
Vin
≤
30 Vdc
15 Vdc
≤
Vin
≤
30 Vdc
5.0 mA
≤
IO
≤
1.0 A
NOTES:
1. Tlow = 0°C for MCT78XXC
= – 40°C for MCT78XXB
MCT7812C
Max
12.5
—
12.6
240
120
240
120
8.0
—
1.0
0.5
Min
11.5
11.4
—
—
—
—
—
—
—
—
—
Typ
12
12
—
10
5.0
3.0
2.0
5.5
—
—
—
Max
12.5
12.6
—
mV
240
120
mV
240
120
8.0
1.0
—
0.5
mA
mA
Unit
Vdc
Vdc
Symbol
VO
VO
Min
11.5
—
11.4
Typ
12
—
12
10
5.0
3.0
2.0
5.5
—
—
—
Regline
—
—
Regload
—
—
IB
∆I
B
—
—
—
—
Thigh = +125°C for MCT78XXB, C. When the junction temperature exceeds +125°C, internal current limiting
will reduce the output current to less than 1.0 A at a VI–VO of 15 V or
greater. The MC7800 die will supply more current under the same conditions.
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.
MOTOROLA
MCT7800
5
