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MIC29710-5.0BT Datasheet(PDF) 9 Page - Micrel Semiconductor

Part # MIC29710-5.0BT
Description  7.5A Fast-Response LDO Regulator
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC29710-5.0BT Datasheet(HTML) 9 Page - Micrel Semiconductor

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Micrel, Inc.
MIC29710/29712
October 2006
9
M9999-101906
Adjustable Regulator Design
The adjustable regulator version, MIC29712, allows pro-
gramming the output voltage anywhere between 1.25V
and the 16V maximum operating rating of the family.
Two resistors are used. Resistors can be quite large, up
to 100kΩ, because of the very high input impedance and
low bias current of the sense comparator. The resistor
values are calculated by:
⎟⎟
⎜⎜
×
=
1
1.240
V
R2
R1
OUT
Where VO is the desired output voltage. Figure 4 shows
component definition.
R1
100k
R2
56.2k
VOUT = 1.240V× [1 + (R1 / R2)]
VIN
4.75 to 5.25
VOUT
3.45V
MIC29712BT
33µF
10µF
Figure 4. Adjustable Regulator with Resistors
Enable Input
The MIC29712 versions features an enable (EN) input
that allows ON/OFF control of the device. Special design
allows “zero” current drain when the device is disabled—
only micro-amperes of leakage current flows. The EN
input has TTL/CMOS compatible thresholds for simple
interfacing with logic, or may be directly tied to VIN.
Enabling the regulator requires approximately 20µA of
current into the EN pin.
Minimum Load Current
The MIC29710/12 regulators are specified between finite
loads. If the output current is to small, leakage currents
dominate and the output voltage rises. A 10mA minimum
load current is necessary for proper regulation.
Standard (Ω)
Voltage
R1
R2
2.85
100k
76.8k
2.9
100k
75.0k
3.0
100k
69.8k
3.1
100k
66.5k
3.15
100k
64.9k
3.3
100k
60.4k
3.45
100k
56.2k
3.525
93.1k
51.1k
3.6
100k
52.3k
3.8
100k
48.7k
4.0
100k
45.3k
4.1
100k
43.2k
Figure 5. MIC29712 Resistor Table


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