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SC1531CSTR PDF даташит

Спецификация SC1531CSTR изготовлена ​​​​«Semtech Corporation» и имеет функцию, называемую «200mA & 250mA SmartLDOs».

Детали детали

Номер произв SC1531CSTR
Описание 200mA & 250mA SmartLDOs
Производители Semtech Corporation
логотип Semtech Corporation логотип 

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SC1531CSTR Даташит, Описание, Даташиты
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









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SC1531CSTR Даташит, Описание, Даташиты
SC1531(A)
POWER MANAGEMENT
Absolute Maximum Rating
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 (SC1531)
LDO Output Current (SC1531A)
Thermal Impedance Junction to Ambient
Thermal Impedance Junction to Case
Operating Ambient TemperatureRange
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering) 10 Sec.
ESD Rating
IO
IO
qJA
qJC
TA
TJ
TSTG
TLEAD
VESD
200
250
130
47
-5 to +70
-5 to +125
-65 to +150
300
2
mA
mA
°C/W
°C/W
°C
°C
°C
°C
kV
Electrical Characteristics
Unless specified: TA = 25°C, VIN = 5V, VAUX = 3.3V, IO = max. rated, CO = 4.7µF. Values in bold apply over full operating temperature range.
Parameter
Symbol
Test Conditions
Min Typ Max Units
VIN
Supply Voltage
VIN
VAUX = 0V
4.3 5.0 5.5
V
Quiescent Current
IQ VIN = 5V, VAUX = 0V, IO = 0mA
7.0 10.0 mA
11.0
VIN = 5V, VAUX = 3.3V, IO = 0mA
7.5 10.0 mA
12.0
Reverse Leakage From VAUX
IVIN
VAUX = 3.6V, VIN = 0V, IO = 0mA
1.0 10
20
µA
VAUX
Supply Voltage
VAUX
3.0 3.3 3.6
V
Quiescent Current
IQ(AUX)
VAUX = 3.3V, VIN = 0V, IO = 0mA
0.8 1.5 mA
2.0
VAUX = 3.3V, VIN = 5V, IO = 0mA
0.6 1.0 mA
2.0
Reverse Leakage From VIN
IVAUX VIN = 5.5V, VAUX = 0V, IO = 0mA
7 50 µA
100
ã 2000 Semtech Corp.
2
www.semtech.com









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SC1531CSTR Даташит, Описание, Даташиты
SC1531(A)
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless specified: TA = 25°C, VIN = 5V, VAUX = 3.3V, IO = max. rated, CO = 4.7µF. Values in bold apply over full operating temperature range.
Parameter
Symbol
Test Conditions
Min Typ Max Units
5V Detect(1)(2)(3)
Low Threshold Voltage
Hysteresis
VTH(LO)
VHYST
VIN Falling
3.90 4.05 4.20 V
90 200
mV
80
High Threshold Voltage
VO
VTH(HI)
VIN Rising
4.30 V
LDO Output Voltage
Line Regulation
VO
REG(LINE)
IO = 20mA
4.3V £ VIN £ 5.5V, 0mA £ IO £ IO(MAX)
3.9V £ VIN £ 4.3V, VAUX = 3.3V,
0mA
£
IO
£
I (4)
O(MAX)
VIN = 4.3V to 5.5V
3.267
3.234
3.000
3.300
3.333
3.366
V
0.12
0.40
0.60
%
Load Regulation
REG(LOAD)
IO = 20mA to IO(MAX)
0.12 0.40
0.60
%
SENSE
SENSE Pin Impedance
DR
RSENSE
6.0 8.5
kW
Drive Voltage
VDR
4.3V £ VIN £ 5.5V, IDR = 200µA
3.4 VIN - 0.8
3.3
V
VIN < VTH(LO), IDR = -200µA
35 150 mV
200
Peak Drive Current
Drive High Delay(1)(5)
Drive Low Delay(1)(5)
See next page for Notes.
IDR(PK)
tDH
tDL
Sinking: VIN = 3.9V, VDR = 1V;
Sourcing: VIN = 4.3V, (VIN - VDR) = 2V
CDR = 1.2nF, VIN ramping up, measured
from VIN = VTH(HI) to VDR = 2V
CDR = 1.2nF, VIN ramping down, measured
from VIN = VTH(LO) to VDR = 2V
7
6
mA
0.5 1.0 µs
2.0
0.5 1.0 µs
2.0
ã 2000 Semtech Corp.
3
www.semtech.com










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Номер в каталогеОписаниеПроизводители
SC1531CSTR200mA & 250mA SmartLDOsSemtech Corporation
Semtech Corporation

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