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PDF MC33264 Data sheet ( Hoja de datos )
| Número de pieza | MC33264 | |
| Descripción | LOW DROPOUT MICROPOWER VOLTAGE REGULATORS WITH ON/OFF CONTROL | |
| Fabricantes | Motorola Semiconductors | |
| Logotipo |  |
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Order this document by MC33264/D
™Micropower smallCAP
MC33264
Voltage Regulators with
On/Off Control
The MC33264 series are micropower low dropout voltage regulators
available in SO–8 and Micro–8 surface mount packages and a wide range of
output voltages. These devices feature a very low quiescent current (100 µA
in the ON mode; 0.1 µA in the OFF mode), and are capable of supplying
output currents up to 100 mA. Internal current and thermal limiting protection
is provided. They require only a small output capacitance for stability.
Additionally, the MC33264 has either active HIGH or active LOW control
(Pins 2 and 3) that allows a logic level signal to turn–off or turn–on the
regulator output.
Due to the low input–to–output voltage differential and bias current
specifications, these devices are ideally suited for battery powered
computer, consumer, and industrial equipment where an extension of useful
battery life is desirable.
MC33264 Features:
• Low Quiescent Current (0.3 µA in OFF Mode; 95 µA in ON Mode)
• Low Input–to–Output Voltage Differential of 47 mV at 10 mA, and
131 mV at 50 mA
• Multiple Output Voltages Available
• Extremely Tight Line and Load Regulation
• Stable with Output Capacitance of Only
0.22 µF for 4.0 V, 4.75 V and 5.0 V Output Voltages
0.33 µF for 2.8 V, 3.0 V, 3.3 V and 3.8 V Output Voltages
• Internal Current and Thermal Limiting
• Logic Level ON/OFF Control
• Functionally Equivalent to TK115XXMC and LP2980
LOW DROPOUT
MICROPOWER VOLTAGE
REGULATORS WITH
ON/OFF CONTROL
SEMICONDUCTOR
TECHNICAL DATA
8
1
8
1
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SO–8)
DM SUFFIX
PLASTIC PACKAGE
CASE 846A
(Micro–8)
PIN CONNECTIONS
1
Vin
2
On/Off
Representative Block Diagram
Thermal and
Anti–Sat
Protection
Rint
8
Vout
7
Base
3
On/Off
1.23 V
Vref
MC33264
52.5 k
This device contains 37 active transistors.
5
Adj
6
Gnd
MOTOROLA ANALOG IC DEVICE DATA
Input
On/Off
On/Off
N/C
1
2
3
4
8 Output
7 Base
6 Gnd
5 Adjust
(Top View)
ORDERING INFORMATION
Device
Operating
Temperature Range Package
MC33264D–2.8
MC33264D–3.0
MC33264D–3.3
MC33264D–3.8
MC33264D–4.0
MC33264D–4.75
MC33264D–5.0
TA = – 40° to +85°C
MC33264DM–2.8
MC33264DM–3.0
MC33264DM–3.3
MC33264DM–3.8
MC33264DM–4.0
MC33264DM–4.75
MC33264DM–5.0
SO–8
Micro–8
© Motorola, Inc. 1998
Rev 3
1
1 page  
MC33264
Figure 7. Regulator Output Voltage Trim
Vin
3.3 µF
2
Control Input On/Off
1
Vin
8
Vout
7
Base N/C
3 On/Off
Gnd
6
4
N/C
Adj
5
R1
0.01
Vout
3.0, 3.3 or 5.0 V
3.3 µF
R2
+ ǒ ) Ǔ )The complete equation for the output voltage is:
Vout Vref 1
R1
R2
IFB R1
where Vref is the nominal 1.235 V reference voltage and IFB is
the feedback pin bias current, nominally –20 nA. The
minimum recommended load current of 1.0 µA forces an
upper limit of 1.2 MΩ on the value of R2, if the regulator must
work with no load. IFB will produce a 2% typical error in Vout
which may be eliminated at room temperature by adjusting
R1. For better accuracy, choosing R2 = 100 K reduces this
error to 0.17% while increasing the resistor program current
to 12 µA.
Output Noise
In many applications it is desirable to reduce the noise
present at the output. Reducing the regulator bandwidth by
increasing the size of the output capacitor is the only method
for reducing noise.
Noise can be reduced fourfold by a bypass capacitor
across R1, since it reduces the high frequency gain from 4 to
unity for the MC33264D–5.0. Pick
+CBYPASS
1
2π R1 x 200 Hz
or about 0.01 µF. When doing this, the output capacitor must
be increased to 3.3 µF to maintain stability. These changes
reduce the output noise from 430 µV to 100 Vrms for a
100 kHz bandwidth for the 5.0 V output device. With the
bypass capacitor added, noise no longer scales with output
voltage so that improvements are more dramatic at higher
output voltages.
Unregulated Input
6.0 to 10 Vdc
0.1
Ground
TYPICAL APPLICATIONS
Figure 8. Lithium Ion Battery Cell Charger
1
2 Vin
Control On/Off
8
Vout
7
Base N/C
MC33264D–5.0
3
On/Off
4
N/C
Gnd Adj
65
1N4001
200 k
1%
100 k
1%
0.22
50 k
4.2 V ± 0.15 V
Lithium Ion
Rechargeable Cell
MOTOROLA ANALOG IC DEVICE DATA
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MC33264.PDF ] | |
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