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參數(shù)資料
| 型號(hào)： | MC33264D-5.0 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | LOW DROPOUT MICROPOWER VOLTAGE REGULATORS WITH ON/OFF CONTROL |
| 中文描述： | 5 V FIXED POSITIVE LDO REGULATOR, 0.23 V DROPOUT, PDSO8 |
| 封裝： | PLASTIC, SO-8 |
| 文件頁(yè)數(shù)： | 5/8頁(yè) |
| 文件大?。?/td> | 173K |
| 代理商： | MC33264D-5.0 |
MC33264
5
MOTOROLA ANALOG IC DEVICE DATA
Figure 7. Regulator Output Voltage Trim
Vin
Vout
3.0, 3.3 or 5.0 V
3.3
μ
F
0.01
N/C
N/C
R2
R1
2
3
Gnd
Adj
6
5
4
Base
7
Vout
Vin
1
8
On/Off
Control Input
3.3
μ
F
On/Off
The complete equation for the output voltage is:
Vout
Vref
1
R1
R2
IFBR1
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
μ
A forces an
upper limit of 1.2 M
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
μ
A.
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
2
π
R1 x 200 Hz
or about 0.01
μ
F. When doing this, the output capacitor must
be increased to 3.3
μ
F to maintain stability. These changes
reduce the output noise from 430
μ
V 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.
TYPICAL APPLICATIONS
Figure 8. Lithium Ion Battery Cell Charger
Unregulated Input
6.0 to 10 Vdc
2
3
6
4
7
1
8
5
Gnd
On/Off
Vin
Vout
Base
Adj
MC33264D–5.0
Ground
1N4001
0.22
200 k
1%
100 k
1%
50 k
Control
N/C
N/C
0.1
Lithium Ion
Rechargeable Cell
4.2 V
±
0.15 V
On/Off
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| MC33264DM-3.0 | LOW DROPOUT MICROPOWER VOLTAGE REGULATORS WITH ON/OFF CONTROL |
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| MC33264DM-3.8 | LOW DROPOUT MICROPOWER VOLTAGE REGULATORS WITH ON/OFF CONTROL |
| MC33264DM-4.0 | LOW DROPOUT MICROPOWER VOLTAGE REGULATORS WITH ON/OFF CONTROL |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
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| MC33266 | 制造商:SPC Multicomp 功能描述:HEATSINK TO220/218 3.6/W NOTCHED 制造商:SPC Multicomp 功能描述:HEATSINK TO220/218 3.6C/W NOTCHED 制造商:SPC Multicomp 功能描述:HEAT SINK; Packages Cooled:TO-218 / TO-220; Thermal Resistance:3.6C/W; External Height - Imperial:2"; External Height - Metric:50.8mm; External Width - Imperial:1.638"; External Width - Metric:41.6mm; External Length - Metric:25mm ;RoHS Compliant: Yes |
| MC33267 | 制造商:SPC Multicomp 功能描述:HEATSINK TO220/218 3.1/W NOTCHED 制造商:SPC Multicomp 功能描述:HEATSINK TO220/218 3.1C/W NOTCHED 制造商:PRIVATE LABEL 功能描述:HEATSINK TO220/218 3.1C/W NOTCHED, Packages Cooled:TO-218, TO-220, Thermal Resi 制造商:SPC Multicomp 功能描述:HEAT SINK, Packages Cooled:TO-218 / TO-220, Thermal Resistance:3.1C/W, External Height - Imperial:2.5", External Height - Metric:63.5mm, External Width - Imperial:1.638", External Width - Metric:41.6mm, External Length - Metric:25mm, RoHS Compliant: Yes |
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| MC33267D2TR4 | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
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