MC34268 查看數據表（PDF） - ON Semiconductor
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MC34268 Datasheet PDF : 8 Pages
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MC34268
MAXIMUM RATINGS
Rating
Power Supply Input Voltage
Power Dissipation and Thermal Characteristics
DT Suffix, Plastic Package, Case 369A
TA = 25°C, Derate Above TA = 25°C
Thermal Resistance, Junction–to–Case
Thermal Resistance, Junction–to–Air
D Suffix, Plastic Package, Case 751
TA = 25°C, Derate Above TA = 25°C
Thermal Resistance, Junction–to–Case
Thermal Resistance, Junction–to–Air
ST Suffix, Plastic Package, Case 318E
TA = 25°C, Derate Above TA = 25°C
Thermal Resistance, Junction–to–Case
Thermal Resistance, Junction–to–Air
Operating Junction Temperature Range
Storage Temperature
Symbol
Value
Unit
Vin
15
V
PD
RθJC
RθJA
PD
RθJC
RθJA
PD
RθJC
RθJA
TJ
Tstg
Internally Limted
5.0
87
W
°C/W
°C/W
Internally Limited
22
140
W
°C/W
°C/W
Internally Limited
15
245
0 to +150
– 55 to +150
W
°C/W
°C/W
°C
°C
ELECTRICAL CHARACTERISTICS
(Vin = 4.25 V, CO = 10 µF, for typical values TJ = 25°C, for min/max values TJ = 0°C to +125°C, unless otherwise noted.)
Characteristic
Symbol
Min
Typ
Max Unit
Output Voltage (TJ = 25°C, IO = 0 mA)
Output Voltage, over Line, Load, and Temperature (Vin = 3.9 V to 15 V,
IO = 0 mA to 490 mA)
Line Regulation (Vin = 4.25 V to 15 V, IO = 0 mA, TJ = 25°C)
Load Regulation (IO = 0 mA to 800 mA, TJ = 25°C)
VO
2.81
2.85
2.89
V
2.76
2.85
2.93
Regline
—
—
0.3
%
Regload
—
—
0.5
%
Dropout Voltage (IO = 490 mA)
Ripple Rejection (f = 120 Hz)
Vin – VO
—
0.95
1.1
V
RR
55
—
—
dB
Maximum Output Current (Vin = 5.0 V)
I(max)
800
—
—
mA
Bias Current (Vin = 4.25 V, IO = 0 mA)
Minimum Load Current to maintain Regulation (Vin = 15 V)
IB
IL(min)
— 5.0 to 3.0 8.0
mA
—
—
0
mA
Figure 1. Dropout Voltage versus
Output Load Current
1.5
TJ = 25°C
1.3
Figure 2. Transient Load Regulation
1.1
Vin = 5.0 V
CO = 10 µF
TA = 25°C
0.9
0.7
0.5
0
200
400
600
800
1000
IO, OUTPUT LOAD CURRENT (mA)
20 ms/DIV
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