mc33264dm ON Semiconductor, mc33264dm Datasheet - Page 5

• Manufacturer Part Number: mc33264dm
• Description: Low Dropout Micropower Voltage Regulators With On/off Control
• Manufacturer: ON Semiconductor

Introduction
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.
input to ground if more than 4.0 inches of wire connects the
input to either a battery or power supply filter capacitor.
The MC33264 regulators are designed with internal
A bypass capacitor is recommended across the MC33264
1000
800
600
400
200
240
200
160
120
80
40
0
0
0.3
0
Figure 5. Dropout Voltage versus Output Current
Figure 3. Input Current versus Input Voltage
1.0
2.0
R
C
T
MC33264D−5.0
A
L
L
= 25°C
= 40 to 50 k
= 1.0 μF
I
O
4.0
V
, OUTPUT CURRENT (mA)
in
, INPUT VOLTAGE (V)
6.0
10
No Load
T
MC33264D−5.0
A
= 25°C
8.0
APPLICATION INFORMATION
100
10
http://onsemi.com
400
12
5
300
250
200
150
100
50
−50
On/Off Control
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 V
when V
input is open or greater than V
Programming The Output Voltage
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.
5.04
5.03
5.02
5.01
5.00
4.99
4.98
4.97
4.96
On/Off control of the regulator may be accomplished in
The MC33264 output voltage is automatically set using its
Figure 6. Dropout Voltage versus Temperature
−55
R
T
MC33264D−5.0
A
L
Figure 4. Output Voltage versus Temperature
= 5.0 k
= 25°C
in
= 6.0 V. The regulator is off when the control
−25
in
0
− 2.4 V, sinking a typical current of 18 μA
T
A
T
, AMBIENT TEMPERATURE (°C)
A
0
, TEMPERATURE (°C)
25
50
I
T
MC33264D−5.0
O
A
= 10 mA
= 25°C
in
50
− 0.2 V.
R
R
R
L
L
L
= 100
= 5.0 k
= 500
100
75
100
150
55
50
45
40
35
30
125