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參數資料
| 型號： | SC1531CSTR |
| 廠商： | Semtech Corporation |
| 英文描述： | 200mA & 250mA SmartLDOs |
| 中文描述： | 200毫安 |
| 文件頁數： | 1/11頁 |
| 文件大?。?/td> | 264K |
| 代理商： | SC1531CSTR |
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www.semtech.com
SC1531(A)
200mA & 250mA SmartLDOsTM
POWER MANAGEMENT
Revision 1, December 2000
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 R
DS(ON) of 400mW is
recommended (320mW for SC1531A).
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.
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
u Desktop Computers
u Network Interface Cards (NICs)
u PCMCIA/PCI Interface Cards
u CardbusTM Technology
u Power supplies with multiple input sources
5V
3.3V
3.3V OUT
Q1
C4
4.7uF
C5
0.1uF
C3
0.1uF
C2
4.7uF
C1
0.1uF
U1
SC1531
1
2
3
4
5
6
7
8
VIN
NC
VAUX
GND
NC
SENSE
VO
DR
Notes for Typical Application Circuit:
(1) External switch (Q1): use Motorola MGSF1P02ELT1
or equivalent (PMOS, typical Gate Threshold Voltage =
1V, typical R
DS(ON) = 0.4W at VGS = 2.5V) for SC1531. Use
Vishay Si2301DS or equivalent for SC1531A.
(2) Connection of VAUX (pin 3) is optional.
Description
Features
Applications
Typical Application Circuit
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相關代理商/技術參數 |
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|---|---|
| SC1532 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:400mA SmartLDOTM with Internal Pass MOSFET |
| SC1532CS | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:400mA SmartLDOTM with Internal Pass MOSFET |
| SC1532CS.TR | 制造商:Semtech Corporation 功能描述:3.3 V FIXED POSITIVE LDO REGULATOR, 8 Pin Plastic SOP |
| SC1534 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:400mA SmartLDOTM |
| SC1534CMTR | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:400mA SmartLDOTM |
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