SPX1580 Ver la hoja de datos (PDF) - Signal Processing Technologies
Número de pieza
componentes Descripción
Fabricante
SPX1580
Signal Processing Technologies
SPX1580 Datasheet PDF : 8 Pages
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PIN DESCRIPTION
Pin Number
1
2
3
4
Pin Name
SENSE
ADJ
VOUT
VCTRL
5
VIN
(4) VCTRL
DESCRIPTION
Allows Kelvin sense of VOUT at load. (Positive side of the reference
voltage of the device)
Negative side of the reference voltage for the device. Adding a
small bypass capacitor from ADJ pin to ground will improve the
transient response.
Power output of the device.
Supply pin for the control circuitry of the device. The current flow
into this pin will be about 1% of the output current. VCTRLmust be
between 0.1V and 1.3V greater than the ouput voltage for the
device to regulate.
Output load current is supplied through this pin. VIN must be
between 0.1V and 0.8V greater than the output voltage for this
device to regulate.
BLOCK DIAGRAM
VIN (5)
S.O.A
CURRENT
LIMIT
AMPLIFIER
LIMIT
SENSE
THERMAL OVERLOAD
VOLTAGE
REGULATION
AMPLIFIER
VREF
VOUT (3)
SENSE (1)
ADJ (2)
The SPX1580 is designed as a high performance
and low cost solution for application requiring a
lower dropout than traditional NPN regulators.
The SPX1580 uses a separate input voltage VCTRL
( VCTRL ≥ VOUT + 1.3V) to minimize the dropout
voltage. This allows the 2.5V power for the load
to come from a 3.3V system supply.
As added benefit this will reduce the heat dissi-
pation*, and lower heatsink and cooling fan cost.
APPLICATION INFORMATION
A typical application would use 3.3V for VIN
and 5.0V for VCTRL from a motherboard power
supply to provide a nominal 2.5V output. Using
the sense pin allows Kelvin measure the output,
reducing resistance-associated errors.
The SPX1580 can power the 2.5V core voltage
for microprocessors such as a PentiumPCTM,
P55CTM, AMD5k86TM and K6TM and the IBM
PowerPCTM 603EV and 604EV processors.
Date: 5/14/04
SPX1580 7A Ultra Dropout Voltage Regulator
3
©Copyright 2004 Sipex Corporation
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