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參數(shù)資料
| 型號： | SC1534CSTR |
| 廠商： | Semtech Corporation |
| 英文描述： | 400mA SmartLDOTM |
| 中文描述： | 400mA的SmartLDOTM |
| 文件頁數(shù)： | 1/7頁 |
| 文件大小： | 94K |
| 代理商： | SC1534CSTR |
2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
400mA SmartLDO
TM
SC1534
PRELIMINARY - July 26, 2000
1
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
FEATURES
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APPLICATIONS
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
400mA load current capability
SO-8 and TO-263 packages
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ORDERING INFORMATION
Part Number
(1)
Desktop Computers
Network Interface Cards (NICs)
PCMCIA/PCI Interface Cards
Cardbus
TM
Technology
Power supplies with multiple input sources
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Maximum
Units
Input Supply Voltage
VIN
-0.5 to +7
V
Auxiliary Supply Voltage
VAUX
-0.5 to +7
V
LDO Output Current
I
O
T
A
10 to 400
mA
Operating Ambient
Temperature Range
-5 to +70
°C
Operating Junction
Temperature Range
T
J
-5 to +125
°C
Storage Temperature
Range
T
STG
-65 to +150
°C
Lead Temperature
(Soldering) 10 Sec
T
LEAD
300
°C
Thermal Impedance
Junction to Ambient
SO-8
(1)
TO-263
θ
JA
65
60
°C/W
Thermal Impedance
Junction to Case
SO-8
TO-263
θ
J C
39
3
°C/W
ESD Rating
ESD
2
kV
Package
SC1534CM.TR
TO-263-5L
SC1534CS.TR
SO-8
Note:
(1) Only available in tape and reel packaging.
BLOCK DIAGRAM
DESCRIPTION
The SC1534 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 out-
put. This ensures an uninterrupted 3.3V output even if
VIN falls out of specification. A maximum R
DS(ON)
of
200m
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 hys-
teresis of approximately 170mV.
The SC1534 is available in the popular SO-8 and 5-
lead TO-263 surface mount packages.
Note:
(1) 1 inch square of 1/16” FR-4, double sided, 1 oz. mini-
mum copper weight.
PIN CONFIGURATION
TO-263-5L
SO-8
Top View
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