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參數資料
| 型號： | SC1537CMTR |
| 廠商： | Semtech Corporation |
| 英文描述： | 700mA SmartLDOTM |
| 中文描述： | 700mA電流SmartLDOTM |
| 文件頁數： | 1/7頁 |
| 文件大小： | 95K |
| 代理商： | SC1537CMTR |
2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
700mA SmartLDO
TM
SC1537
PRELIMINARY - July 25, 2000
1
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
FEATURES
= 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
APPLICATIONS
= Desktop Computers
= Network Interface Cards (NICs)
= PCMCIA/PCI Interface Cards
= CardbusTM Technology
= Power supplies with multiple input sources
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.
DESCRIPTION
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.
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 R
DS(ON) of
100m
is recommended.
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.
APPLICATION CIRCUIT
NOTE:
(1) External switch (Q1): use a low threshold P-channel MOSFET such as Vishay Si2305DS (R
DS(ON) < 71m at
V
GS = 2.5V) or International Rectifier IRLML6401 (RDS(ON) < 85m at VGS = 2.5V), or equivalent.
3.3V OUT
3.3V
5V
3.3V
3.3V OUT
C3
0.1uF
C4
10uF
C2
10uF
C5
0.1uF
Q1
C1
0.1uF
U1
SC1537CM
1
2
3
4
5
VIN
VAUX GND
VO
DR
TAB
U1 SC1537CS
1
2
3
4
5
6
7
8
VAUX
VIN
VO
DR
GND
C2
10uF
Q1
C4
10uF
C1
0.1uF
C3
0.1uF
C5
0.1uF
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相關代理商/技術參數 |
參數描述 |
|---|---|
| SC1537CSTR | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:700mA SmartLDOTM |
| SC1538 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:DUAL LINEAR CONTROLLER |
| SC1538CS12/23TR | 制造商:Semtech Corporation 功能描述:DC DC Cntrlr Dual-OUT 12V Input 8-Pin SOIC T/R |
| SC1538CS15 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:DUAL LINEAR CONTROLLER |
| SC1538CS15/18 TR | 制造商:Semtech Corporation 功能描述:DC DC Cntrlr Dual-OUT 12V Input 8-Pin SOIC T/R |
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