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PDF L1581D-2.5 Data sheet ( Hoja de datos )
| Número de pieza | L1581D-2.5 | |
| Descripción | Dual Input Ultra Low Dropout Voltage Regulator (ULDO) | |
| Fabricantes | ETC | |
| Logotipo |  |
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NIKO-SEM
Dual Input Ultra Low Dropout
Voltage Regulator (ULDO)
L1581 Series
TO-252
GENERAL DESCRIPTION
The L1581 is a positive and very low
dropout voltage regulator with 5A output
current capability. When supplying 2.5V or
2.8V on Motherboards or VGA Card where
both 5V and 3.3V supplies are available,
the superior dropout characteristics of the
L1581 result in reduced heat dissipation
compared to regular LDOs, thus allowing
heat sink reduction. The adjustable version
requires only two external resistors to set
the output. The L1581 features a low
dropout of less than 600mV and offers fast
transient response, remote sense, internal
limiting, thermal shutdown and safe
operating area protection of the output
device.
The L1581 is a five terminal adjustable
voltage regulator available in the popular 5
pin TO-252 packages.
FEATURES
z Low dropout voltage 600mV at rated load
current
z Remote sense operation
z Fast transient response
z 0.5% voltage reference initial accuracy
z Standard 5 terminal, Low cost TO-252
packages
APPLICATIONS
z 3.3V to 2.8V or 2.5V for Motherboards or
VGA Card
z Spilt plane microprocessor supplies
z Post regulator for switching supplies
TYPICAL APPLICATION
Adjustable Output Parts(2)
Vin
Vctrl
C1
330uF
C2
10uF
L1581X
5 Vin
4 CTR'L
OUT 3
SENSE 1
Vref
R1
Iadj
C3
0.033uF
R2
Vout
C4
330uF
Vo = Vref (1+R2/R1) + Iadj x R2
1 OCT-11-Y02
1 page  
NIKO-SEM
Dual Input Ultra Low Dropout
Voltage Regulator (ULDO)
L1581 Series
TO-252
PIN FUNCTIONS
NO FUNCTION
DESCRIPTION
1
Sense
This pin is the positive side of the reference voltage for the device. With
this pin it is possible to Kelvin sense the output voltage at the load.
This pin is the negative side of the reference voltage for the device.
2 Adjust Transient response can be improved by adding a small bypass capacitor
from the adjust pin to ground.
3
Output
This is the power output of the device, and is electrically connected to
the TAB.
This pin is the supply pin for the control circuitry for the device. The
4
Control
current flow into this pin will be approximately 1% of the output. For the
device to regulate, the voltage at this pin must be between 1.0V and
1.3V greater than the output voltage (see dropout specifications).
This is the collector input to the power device of the L1581. The output
load current is supplied through this pin. For the device to regulate, the
5 Input voltage on this pin must be between 0.1V and 0.7V greater than the
output, depending upon load current (see dropout specifications).
5 OCT-11-Y02
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet L1581D-2.5.PDF ] | |
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