DataSheet.es    

PDF SC1532CS Datasheet ( Hoja de datos )

Número de pieza SC1532CS
Descripción 400mA SmartLDOTM with Internal Pass MOSFET
Fabricantes Semtech Corporation 
Logotipo Semtech Corporation Logotipo



Total 9 Páginas
		
SC1532CS Hoja de datos, Descripción, Manual
400mA SmartLDOTM with Internal Pass
MOSFET
SC1532
January 3, 2000
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
Intended for applications such as Power Managed PCI,
the SC1532 is designed to maintain a glitch-free 3.3V
output when at least one of two inputs, 5V (VIN1) and
3.3V (VIN2), is present.
The SC1532 combines a 5V to 3.3V linear regulator
with an integral 3.3V bypass switch, along with logic
and detection circuitry to control which supply provides
the power for the output.
Whenever VIN1 exceeds a predetermined threshold
value, the internal 3.3V PMOS linear regulator is en-
abled, and the internal pass NMOS is turned off.
When VIN1 falls below a lower threshold value, the
NMOS pass device is turned on and the PMOS linear
regulator is turned off. This ensures an uninterrupted
3.3V output even if VIN1 falls out of specification.
When both supplies are simultaneously available, the
PMOS linear regulator will be turned on, and the
NMOS pass will be turned off, thus preferentially sup-
plying the output from the 5V supply.
FEATURES
Glitch-free transition between input sources
Internal logic selects input source
5V detector with hysteresis
1% regulated output voltage accuracy
400mA load current capability
APPLICATIONS
Desktop Computers
Network Interface Cards (NICs)
PCMCIA/PCI Interface Cards
Peripheral Cards
ORDERING INFORMATION
Part Number(1)
Package
SC1532CS
SO-8
Note:
(1) Add suffix ‘TR’ for tape and reel packaging.
The internal 5V detector has its upper threshold (for
VIN1 rising) set to 4.18V (typical) while the lower
threshold (for VIN falling) is at 4.1V (typical) giving a
hysteresis of approximately 80mV.
The SC1532 is available in the popular SO-8 surface
mount package.
TYPICAL APPLICATION CIRCUIT
3.3VAUX IN
5V IN
3.3V OUT
C1
4.7uF
C2
4.7uF
C3
4.7uF
U1
1
2
3
4
VIN2 GND
VIN1 GND
VO GND
CP GND
8
7
6
5
SC1532
C4
1nF
NOTES:
(1) Ceramic capacitors are recommended - see Applications Information for further details.
(2) Output capacitor C3 needs to be 1.0uF or greater for stability. Additional capacitance (tantalum or ceramic) will
improve overall performance.
© 2000 SEMTECH CORP.
1
652 MITCHELL ROAD NEWBURY PARK CA 91320

1 page

SC1532CS pdf
400mA SmartLDOTM with Internal Pass
MOSFET
SC1532
January 3, 2000
TYPICAL CHARACTERISTICS
Quiescent Current (IQ1) vs.
Junction Temperature vs. VIN2
2.0
VIN2 = 3.6V
1.8
1.6
1.4
1.2
VIN2 = 0V
1.0
0.8
0.6
0.4
VIN1 = 5V
0.2 IO = 0mA
0.0
-25 0
25 50 75
TJ (°C)
100 125
LDO Output Voltage vs. Junction
Temperature vs. Output Current
3.310
VIN1 = 5V
3.305 VIN2 = 3.3V
3.300
IO = 0mA
3.295
IO = 200mA
3.290
3.285
IO = 400mA
3.280
3.275
3.270
-25 0 25 50 75 100 125
TJ (°C)
LDO Load Regulation vs.
Junction Temperature
0.40
0.35
0.30
VIN1 = 5V
VIN2 = 3.3V
IO = 20mA to 400mA
0.25
0.20
0.15
0.10
0.05
0.00
-25 0 25 50 75 100
TJ (°C)
125
Quiescent Current (IQ2) vs.
Junction Temperature vs. VIN1
800
VIN1 = 0V
700
600
VIN1 = 5.5V
500
400
300
200
100 VIN2 = 3.3V
IO = 0mA
0
-25 0
25 50 75
TJ (°C)
100 125
LDO Line Regulation vs.
Junction Temperature
0.40
VIN1 = 4.3V to 5.5V
0.35 IO = 400mA
0.30
0.25
0.20
0.15
0.10
0.05
0.00
-25
0
25 50 75 100 125
TJ (°C)
LDO Current Limit vs.
Junction Temperature
1200
1000
VIN1 = 5V
VIN2 = 0V
VO = 0V
800
600
400
200
0
-25 0 25 50 75 100 125
TJ (°C)
© 2000 SEMTECH CORP.
5
652 MITCHELL ROAD NEWBURY PARK CA 91320

5 Page



PáginasTotal 9 Páginas
PDF Descargar[ SC1532CS.PDF ]

Enlace url


Hoja de datos destacado

Número de piezaDescripciónFabricantes
SC1532CS400mA SmartLDOTM with Internal Pass MOSFETSemtech Corporation
Semtech Corporation

Número de piezaDescripciónFabricantes
SLA6805M

High Voltage 3 phase Motor Driver IC.

Sanken
Sanken
SDC1742

12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters.

Analog Devices
Analog Devices


DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares,
permitiéndote verlos en linea o descargarlos en PDF.


www.DataSheet.es    |   2019   |  Privacy Policy  |  Contacto  |  Buscar