MC34268 ON Semiconductor, MC34268 Datasheet - Page 2

• Manufacturer Part Number: MC34268
• Description: SCSI-2 Active Terminator Regulator
• Manufacturer: ON Semiconductor

MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V in = 4.25 V, C O = 10 F, for typical values T J = 25 C, for min/max values T J = 0 C to +125 C, unless otherwise noted.)
Power Supply Input Voltage
Power Dissipation and Thermal Characteristics
Operating Junction Temperature Range
Storage Temperature
Output Voltage (T J = 25 C, I O = 0 mA)
Line Regulation (V in = 4.25 V to 15 V, I O = 0 mA, T J = 25 C)
Load Regulation (I O = 0 mA to 800 mA, T J = 25 C)
Dropout Voltage (I O = 490 mA)
Ripple Rejection (f = 120 Hz)
Maximum Output Current (V in = 5.0 V)
Bias Current (V in = 4.25 V, I O = 0 mA)
Minimum Load Current to maintain Regulation (V in = 15 V)
1.5
1.3
1.1
0.9
0.7
0.5
DT Suffix, Plastic Package, Case 369A
D Suffix, Plastic Package, Case 751
ST Suffix, Plastic Package, Case 318E
Output Voltage, over Line, Load, and Temperature (V in = 3.9 V to 15 V,
I O = 0 mA to 490 mA)
T A = 25 C, Derate Above T A = 25 C
Thermal Resistance, Junction–to–Case
Thermal Resistance, Junction–to–Air
T A = 25 C, Derate Above T A = 25 C
Thermal Resistance, Junction–to–Case
Thermal Resistance, Junction–to–Air
T A = 25 C, Derate Above T A = 25 C
Thermal Resistance, Junction–to–Case
Thermal Resistance, Junction–to–Air
0
Figure 1. Dropout Voltage versus
200
I O , OUTPUT LOAD CURRENT (mA)
Output Load Current
Rating
400
Characteristic
600
800
T J = 25 C
http://onsemi.com
Symbol
R JC
R JA
R JC
R JA
R JC
R JA
1000
T stg
MC34268
V in
P D
P D
P D
T J
2
Internally Limited
Internally Limited
Internally Limted
– 55 to +150
0 to +150
Value
140
245
5.0
15
87
22
15
Figure 2. Transient Load Regulation
V in – V O
Reg load
Symbol
Reg line
I L(min)
I (max)
V O
RR
I B
Unit
C/W
C/W
C/W
C/W
C/W
C/W
W
W
W
V
C
C
2.81
2.76
Min
800
—
—
—
55
—
—
20 ms/DIV
5.0 to 3.0
2.85
2.85
0.95
Typ
—
—
—
—
—
V in = 5.0 V
C O = 10 F
T A = 25 C
Max
2.89
2.93
0.3
0.5
1.1
8.0
—
—
0
Unit
mA
mA
mA
dB
%
%
V
V