MC33264DM-3.8 查看數據表（PDF） - Motorola => Freescale
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MC33264DM-3.8 Datasheet PDF : 8 Pages
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MC33264
Figure 3. Input Current versus Input Voltage
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 4. Output Voltage versus Temperature
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 5. Dropout Voltage versus Output Current
240
RL = 40 to 50 k
200
CL = 1.0 µF
TA = 25°C
MC33264D–5.0
160
120
80
40
0
0.3
1.0
10
100
400
IO, OUTPUT CURRENT (mA)
Figure 6. Dropout Voltage versus Temperature
300
RL = 5.0 k
TA = 25°C
250 MC33264D–5.0
55
RL = 100
50
200
45
RL = 5.0 k
150
40
100
50
–50
RL = 500
35
30
0
50
100
150
TA, TEMPERATURE (°C)
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.
4
MOTOROLA ANALOG IC DEVICE DATA
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