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MIC37501 Datasheet(PDF) 9 Page - Micrel Semiconductor

Part No. MIC37501
Description  5A, Low Voltage μCap LDO Regulator
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Maker  MICREL [Micrel Semiconductor]
Homepage  http://www.micrel.com
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MIC37501 Datasheet(HTML) 9 Page - Micrel Semiconductor

 
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Micrel, Inc.
MIC37501/37502
May 2011
9
M9999-050511-B
that is required. Larger values help to improve
performance even further.
Enable Input
The MIC37501/02 also features an enable input for
on/off control of the device. Its shutdown state draws
“zero” current (only microamperes of leakage). The
enable input is TTL/CMOS-compatible for simple logic
interface, but can be connected up to VIN. When
enabled, it draws approximately 15µA.
By virtue of its low dropout voltage, this device does
not saturate into dropout as readily as similar NPN-
based designs. When converting from 3.3V to 2.5V,
2.5V to 1.8V or 1.65V, or 2.5V to 1.5V, the NPN-
based regulators are already operating in dropout,
with typical dropout requirements of 1.2V or greater.
To convert down to 2.5V without operating in dropout,
NPN-based regulators require an input voltage of at
least 3.7V. The MIC37501/02 regulator will provide
excellent performance with an input as low as 3.0V or
2.25V, respectively. This gives the PNP-based
regulators a distinct advantage over older, NPN-based
linear regulators.
Adjustable Regulator Design
IN
R1
VOUT
VIN
COUT
R2
EN
OUT
ADJ
GND
MIC37502
ENABLE
SHUTDOWN
V
1.240V 1
R1
R2
OUT =+
⎝⎜
⎠⎟
Minimum Load Current
The MIC37501/02 regulator is specified between finite
loads. If the output current is too small, leakage
currents dominate and the output voltage rises. A
10mA minimum load current is necessary for proper
operation.
Figure 2. Adjustable Regulator with Resistors
Error Flag
The MIC37502 allows programming the output voltage
anywhere between 1.24V and the 5.5V maximum
operating rating of the family. Two resistors are used.
Resistors can be quite large, up to 1MΩ, because of
the very high input impedance and low bias current of
the sense comparator.
The MIC37501 features an error flag circuit that
monitors the output voltage and signals an error
condition when the voltage drops 5% below the
nominal output voltage. The error flag is an open-
collector output that can sink 10mA during a fault
condition.
The resistor values are calculated by:
Low output voltage can be caused by a number of
problems, including an overcurrent fault (device in
current limit) or low input voltage. The flag is
inoperative during overtemperature shutdown.
⎟⎟
⎜⎜
=
1
1.240
V
R2
R1
OUT
Where VOUT is the desired output voltage. Figure 2
shows component definition. Applications with widely
varying load currents may scale the resistors to draw
the minimum load current required for proper
operation (see above).


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