MC33264D-2.8 查看數據表（PDF） - ON Semiconductor
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MC33264D-2.8 Datasheet PDF : 10 Pages
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MC33264
1000
800
600
No Load
400
TA = 25°C
MC33264D−5.0
200
0
0
2.0
4.0
6.0
8.0
10
12
Vin, INPUT VOLTAGE (V)
Figure 3. Input Current versus Input Voltage
5.04
5.03
5.02
IO = 10 mA
5.01
TA = 25°C
MC33264D−5.0
5.00
4.99
4.98
4.97
4.96
−55
−25
0
25
50
75 100 125
TA, AMBIENT TEMPERATURE (°C)
Figure 4. Output Voltage versus Temperature
240
RL = 40 to 50 k
200
CL = 1.0 μF
TA = 25°C
MC33264D−5.0
160
120
80
40
300
RL = 5.0 k
TA = 25°C
250 MC33264D−5.0
200
150
100
55
RL = 100
50
45
RL = 5.0 k
40
RL = 500
35
0
0.3
1.0
10
100
400
IO, OUTPUT CURRENT (mA)
Figure 5. Dropout Voltage versus Output Current
50
30
−50
0
50
100
150
TA, TEMPERATURE (°C)
Figure 6. Dropout Voltage versus Temperature
APPLICATION INFORMATION
Introduction
The MC33264 regulators are designed with internal
current limiting and thermal shutdown making them
user−friendly. These regulators require only 0.33 μF (or
greater) capacitance between the output terminal and
ground for stability for 2.8 V, 3.0 V, 3.3 V and 3.8 V output
voltage options. Output voltage options of 4.0 V, 4.75 V and
5.0 V require only 0.22 μF for stability. The output capacitor
must be mounted as close to the MC33264 as possible. If the
output capacitor must be mounted further than two
centimeters away from the MC33264, then a larger value of
output capacitor may be required for stability. A value of
0.68 μF or larger is recommended. Most types of aluminum,
tantalum or multilayer ceramic will perform adequately.
Solid tantalums or appropriate multilayer ceramic
capacitors are recommended for operation below 25°C.
A bypass capacitor is recommended across the MC33264
input to ground if more than 4.0 inches of wire connects the
input to either a battery or power supply filter capacitor.
On/Off Control
On/Off control of the regulator may be accomplished in
either of two ways. Pin 3 may be tied to circuit ground and
a positive logic control applied to Pin 2. The regulator will
be turned on by a positive (>2.4 V) level, typically 5.0 V
with respect to ground, sourcing a typical current of 6.0 μA.
The regulator will turn off if the control input is a logic “0”
(<0.5 V). Alternatively, Pin 2 may be tied to the regulator
input voltage and a negative logic control applied to Pin 3.
The regulator will be turned on when the control voltage is
less than Vin − 2.4 V, sinking a typical current of 18 μA
when Vin = 6.0 V. The regulator is off when the control
input is open or greater than Vin − 0.2 V.
Programming The Output Voltage
The MC33264 output voltage is automatically set using its
internal voltage divider. Alternatively, it may be
programmed within a typical ±15% range of its preset output
voltage. An external pair of resistors is required, as shown
in Figure 7.
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