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PDF SC1537CSTR Data sheet ( Hoja de datos )

Número de pieza SC1537CSTR
Descripción 700mA SmartLDOTM
Fabricantes Semtech Corporation 
Logotipo Semtech Corporation Logotipo



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No Preview Available ! SC1537CSTR Hoja de datos, Descripción, Manual

700mA SmartLDOTM
SC1537
PRELIMINARY - July 25, 2000
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
FEATURES
The SC1537 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.
= Glitch-free transition between input sources
= Internal logic selects input source
= Gate drive for external PMOS bypass switch
= 5V detector with hysteresis
= 1% regulated output voltage accuracy
= 700mA load current capability
= SO-8 and TO-263 packages
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 maximum RDS(ON) of
100mis recommended.
APPLICATIONS
= Desktop Computers
= Network Interface Cards (NICs)
= PCMCIA/PCI Interface Cards
= CardbusTM Technology
= Power supplies with multiple input sources
When both supplies are simultaneously available, the
drive pin (DR) will be pulled High, turning off the exter-
nal PMOS switch.
The internal 5V detector has its upper threshold (for
VIN rising) set to 4.22V (typical) while the lower thresh-
old (for VIN falling) is at 4.05V (typical) giving a hystere-
sis of approximately 170mV.
The SC1537 is available in the popular SO-8 and
5-lead TO-263 surface mount packages.
Q1
ORDERING INFORMATION
Part Number(1)
Package
SC1537CSTR
SO-8
SC1537CMTR
TO-263-5L
Note:
(1) Only available in tape and reel packaging. A reel con-
tains 2500 devices for SO-8 and 800 devices for TO-263.
APPLICATION CIRCUIT
3.3V
5V
C1
0.1uF
C2
10uF
C3
0.1uF
U1 SC1537CS
1
2
3
4
VAUX GND
VIN GND
VO GND
DR GND
8
7
6
5
3.3V OUT
C4
10uF
C5
0.1uF
Q1
5V
3.3V
C1
0.1uF
C2
10uF
C3
0.1uF
U1 SC1537CM
2 VIN TAB DR 5
14
VAUX GND VO
3
C4
10uF
3.3V OUT
C5
0.1uF
NOTE:
(1) External switch (Q1): use a low threshold P-channel MOSFET such as Vishay Si2305DS (RDS(ON) < 71mat
VGS = 2.5V) or International Rectifier IRLML6401 (RDS(ON) < 85mat VGS = 2.5V), or equivalent.
© 2000 SEMTECH CORP.
1
652 MITCHELL ROAD NEWBURY PARK CA 91320

1 page




SC1537CSTR pdf
PRELIMINARY - July 25, 2000
5V DETECT THRESHOLDS
700mA SmartLDOTM
SC1537
NOTE:
(1) VIN rise and fall times (10% to 90%) to be =100µs.
TIMING DIAGRAM
NOTE:
(1) VIN rise and fall times (10% to 90%) to be =100ns.
© 2000 SEMTECH CORP.
5
652 MITCHELL ROAD NEWBURY PARK CA 91320

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