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MC78T12CT Datasheet(PDF) 2 Page - Fairchild Semiconductor

Part # MC78T12CT
Description  3-Terminal 3A Positive Voltage Regulator
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

MC78T12CT Datasheet(HTML) 2 Page - Fairchild Semiconductor

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MC78TXX
2
Absolute Maximum Ratings
Note:
1. Thermal resistance test board
Size: 76.2mm * 114.3mm * 1.6mm(1S0P)
JEDEC standard: JESD51-3, JESD51-7
2. Assume no ambient airflow.
Electrical Characteristics(MC78T05)
(VI = 10V, IO = 3.0 A, 0
°C ≤ TJ ≤ +125°C, Po ≤ PMAX (Note3), unless otherwise specified. )
Note:
3. Although power dissipation is internally limited, specifications apply only for PO
≤ Pmax, Pmax = 25W
4. Load and line regulation are specified at constant junction temperature. Change in Vo due heating effects must be taken into
account separately. Pulse testing with low duty is used.
Parameter
Symbol
Value
Unit
Input Voltage (for VO = 5V to 12V)
(for VO = 15V)
VI
35
40
V
V
Power Dissipation
PD
Internally limited
Thermal Resistance, Junction to Air (Note1, 2)
Ta = +25
°C
R
θJA
65
°C/W
Thermal Resistance, Junction to Case (Note1)
Tc = +25
°C
R
θJC
2.5
°C/W
Operating Junction Temperature Range
TJ
0 ~ +125
°C
Storage Temperature Range
TSTG
-65 ~ +150
°C
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Output Voltage
Vo
5mA
≤≤≤≤ Io ≤≤≤≤ 3.0A , TJ = +25°C
7.3V
≤≤≤≤ VI ≤≤≤≤ 20V, 5mA ≤≤≤≤ Io ≤≤≤≤ 2.0A
4.8
4.75
5.0
5.0
5.2
5.25
V
Line Regulation (Note4)
∆VO
7.2V
≤≤≤≤ VI ≤≤≤≤ 35V , Io=5mA, TJ =+25°C
7.2V
≤≤≤≤ VI ≤≤≤≤ 35V , Io=1.0A, TJ = +25°C
7.5V
≤≤≤≤ VI ≤≤≤≤ 20V, Io =2.0A, TJ = +25°C
8.0V
≤≤≤≤ VI ≤≤≤≤ 12V, Io =3.0A, TJ = +25°C
-3.0
25
mV
Load Regulation (Note4)
∆VO
5mA
≤ Io ≤ 3.0A , TJ = +25°C
5mA
≤ Io ≤ 3.0A
-
10
15
30
80
mV
mV
Thermal Regulation
REGT
Pulse =10ms, P = 20W
TA = +25
°C
-
0.002
0.03
%Vo/W
Quiescent Current
IQ
5mA
≤ Io ≤ 3.0A , TJ = +25°C
5mA
≤ Io ≤ 3.0A
-
3.5
4.0
5.0
6.0
mA
mA
Quiescent Current Change
∆IQ
7.2V
≤ VI ≤ 35V, Io = 5mA
TJ = +25
°C ;
7.5V
≤ VI ≤ 20V, Io =2.0A ;
5mA
≤ Io ≤ 3.0A, TJ = +25°C
-0.1
0.8
mA
Ripple Rejection
RR
f = 120Hz, 8V
≤ VI ≤ 18V, Io = 2.0A
TJ = +25
°C
-75
-
dB
Dropout Voltage
VD
Io = 3A ,TJ = +25
°C-
2.2
2.5
V
Output Noise Voltage
VN
TA = +25
°C, 10Hz ≤ f ≤ 100kHz
-
10
-
µV/Vo
Peak Output Current
IPK
TA = +25
°C-
5.0
-
A
Output Resistance
Ro
f = 1.0kHz
-
2.0
-
m
Short Circuit Current Limit
Isc
VI = 35V, TJ =+25
°C-
1.5
2.5
A
Average Temperature
Coefficient of Output Voltage
∆VO/∆T Io = 5.0mA
-
0.2
-
mV/
°C


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