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PDF SC1531 Datasheet ( Hoja de datos )

Número de pieza SC1531
Descripción 200mA & 250mA SmartLDOs
Fabricantes Semtech Corporation 
Logotipo Semtech Corporation Logotipo



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SC1531 Hoja de datos, Descripción, Manual
SC1531(A)
200mA & 250mA SmartLDOsTM
POWER MANAGEMENT
Description
Features
The SC1531(A) is designed to maintain a glitch-free 3.3V
output when at least one of two inputs, 5V (VIN) and
3.3V (VAUX), is present.
Whenever VIN exceeds a predetermined threshold value,
the internal 3.3V linear regulator is enabled, and DR is
pulled high.
When VIN falls below a lower threshold value, DR is pulled
low and the internal linear regulator is turned off. DR has
been designed to drive the gate of an external low
threshold P-channel MOSFET, which can be used to
connect the 3.3V supply directly to the regulator output.
This ensures an uninterrupted 3.3V output even if VIN
falls out of specification. A typical RDS(ON) of 400mW is
recommended (320mW for SC1531A).
u Glitch-free transition between input sources
u Internal logic selects input source
u Gate drive for external PMOS bypass switch
u 5V detection with hysteresis
u 1% regulated output voltage accuracy
u 200mA load current capability (250mA for SC1531A)
u Remote sense
u SO-8 package
Applications
u Desktop Computers
u Network Interface Cards (NICs)
u PCMCIA/PCI Interface Cards
u CardbusTM Technology
u Power supplies with multiple input sources
When both supplies are simultaneously available, the
drive pin (DR) will be pulled High, turning off the external
PMOS switch.
The internal 5V detector has its upper threshold (for VIN
rising) set to 4.18V (typical) while the lower threshold (for
VIN falling) is at 4.05V (typical) giving a hysteresis of
approximately 130mV.
The SENSE pin, which is connected to the load, connects
internally to the inverting input of the LDO error
amplifier. It enables tight regulation of the load voltage
(while the 5V supply is present) despite variations in load
current.
The SC1531(A) is available in the popular SO-8 surface
mount package.
Typical Application Circuit
Notes for Typical Application Circuit:
(1) External switch (Q1): use Motorola MGSF1P02ELT1
or equivalent (PMOS, typical Gate Threshold Voltage =
1V, typical RDS(ON) = 0.4W at VGS = 2.5V) for SC1531. Use
Vishay Si2301DS or equivalent for SC1531A.
(2) Connection of VAUX (pin 3) is optional.
Q1
5V
3.3V
C1
0.1uF
C2
4.7uF
C3
0.1uF
U1
18
2
3
4
VIN DR
NC VO
VAUX SENSE
GND
NC
7
6
5
SC1531
Revision 1, December 2000
1
C4
4.7uF
3.3V OUT
C5
0.1uF
www.semtech.com

1 page

SC1531 pdf
POWER MANAGEMENT
Pin Configuration
(TOP VIEW)
(SOIC-8)
Block Diagram
SC1531(A)
Ordering Information
Part Number(1) Output Current
Package
SC1531CS.TR
200mA
SO-8
SC1531ACS.TR
250mA
SO-8
Note:
(1) Only available in tape and reel packaging. A reel
contains 2500 devices.
Pin Descriptions
Pin Pin Name Pin Function
1 VIN This is the main input supply for the IC, nominally 5V.
2 NC No connection.
3 VAUX This is the auxiliary input supply, nominally 3.3V. Connection of this pin is optional, and will slightly
improve the turn-on time of the external MOSFET. Leave floating if not used.
4 GND Logic and power ground.
5 NC No connection.
6 SENSE Sense pin for VO. Connect to VO at the load to minimize voltage drop across PCB traces. If
remote sense function is not required, connect directly to pin 7.
7 VO LDO 3.3V output.
8 DR Driver output for external P-channel MOSFET pass element.
ã 2000 Semtech Corp.
5
www.semtech.com

5 Page

SC1531 arduino
POWER MANAGEMENT
Outline Drawing - SO-8
SC1531(A)
JEDEC REF: MS-012AA
Land Pattern - SO-8
Contact Information
Semtech Corporation
Power Management Products Division
652 Mitchell Rd., Newbury Park, CA 91320
Phone: (805)498-2111 FAX (805)498-3804
ã 2000 Semtech Corp.
11
www.semtech.com

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