spx1585at-tr Exar Corporation, spx1585at-tr Datasheet - Page 4

• Manufacturer Part Number: spx1585at-tr
• Description: 5a Low Dropout Voltage Regulator
• Manufacturer: Exar Corporation

Basic Adjustable Regulator
Output Voltage
Consider Figure 2. The resistance R
current flow, normally the specified load current of 10mA. This
current will go through the resistance R
voltage. The current I
its contribution to the overall output voltage is very small and
can generally be ignored .
V
IN
V
IN
V
Fig.2 Basic Adjustable Regulator
OUT
ADJ
Fig.3 Basic Adjustable Regulator
= V
SPX1585
ADJ
REF
50uA
is very small and constant. Therefore
* ( 1 + R
I
ADJ
SPX1585
2
/R
1
) + I
R
ADJ
P
Resistance
Parasitic Line
ADJ
2
to set the overall output
1
generates a constant
* R
R
R
2
V
Case of Regulator
1
2
Connect R
REF
1
to
R
R
1
R
Connect R
V
2
L
OUT
V
OUT
2
to Load
Load Regulation
Parasitic line resistance can degrade load regulation. In order
not to affect the behavior of the regulator, it is best to connect
directly the R
and not to the load. For the same reason, it is best to connect
the resistor R
Output Voltage
The fixed voltage LDO voltage regulators are simple to use
regulators since the V
important, however, to provide the proper output capacitance
for stability and improvement. For most operating conditions a
capacitance of 22uF tantalum or 100uF electrolytic will ensure
stability and prevent oscillation.
V
5V
IN
10uF
C1
2
1
to the Negative side of the load.
resistance from the resistor divider to the case,
Basic Fixed Regulator
OUT
SPX1585
is preset to the specifications. It is
D ate: 05/14/04
SPX1585
10uF
V
3.3V
C2
OUT