SC1534 PDF даташит
Спецификация SC1534 изготовлена «Semtech Corporation» и имеет функцию, называемую «400mA SmartLDOTM». |
|
Детали детали
Номер произв | SC1534 |
Описание | 400mA SmartLDOTM |
Производители | Semtech Corporation |
логотип |
7 Pages
No Preview Available ! |
400mA SmartLDOTM
SC1534
PRELIMINARY - July 26, 2000
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
FEATURES
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 RDS(ON) of
200mΩ 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.
BLOCK DIAGRAM
PIN CONFIGURATION
Top View
SO-8
TO-263-5L
•= 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
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
SC1534CM.TR
TO-263-5L
SC1534CS.TR
SO-8
Note:
(1) Only available in tape and reel packaging.
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
Operating Ambient
Temperature Range
IO 10 to 400 mA
TA -5 to +70 °C
Operating Junction
Temperature Range
TJ -5 to +125 °C
Storage Temperature
Range
TSTG -65 to +150 °C
Lead Temperature
(Soldering) 10 Sec
TLEAD
300
°C
Thermal Impedance
Junction to Ambient
SO-8(1)
θJA
65 °C/W
TO-263
60
Thermal Impedance
Junction to Case
SO-8
θJ C
39 °C/W
TO-263
3
ESD Rating
ESD 2 kV
Note:
(1) 1 inch square of 1/16” FR-4, double sided, 1 oz. mini-
mum copper weight.
1
© 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
No Preview Available ! |
400mA SmartLDOTM
SC1534
PRELIMINARY - July 26, 2000
PIN DESCRIPTION
Pin Name
DR
GND
VAUX
VIN
VO
SO-8 Pin #
4
5,6,7,8
1
2
3
TO-263-5L Pin # Pin Function
5 Driver output for external P-channel MOSFET pass element.
3/TAB
Logic and power ground.
1 This is the auxiliary input supply, nominally 3.3V.
2 This is the main input supply for the IC, nominally 5V.
4 LDO 3.3V output.
APPLICATION CIRCUIT
Q1
3.3VAUX
5V
C1
0.1uF
C2
4.7uF
C3
0.1uF
U1 SC1534CS
1
2
VAUX GND
8
7
3
4
VIN
VO
DR
GND
GND
GND
6
5
3.3V OUT
C4
10uF
C5
0.1uF
Q1
5V
3.3VAUX
C1
0.1uF
C2
4.7uF
C3
0.1uF
U1 SC1534CM
2 VIN TAB DR 5
1
VAUX GND VO
4
3
C4
10uF
3.3V OUT
C5
0.1uF
NOTE:
(1) External switch (Q1): use a low threshold P-channel MOSFET such as Fairchild FDN338P or International
Rectifier IRF7604, or equivalent. (PMOS, typical gate threshold voltage ~ 1V, RDS(ON) < 200mΩ at VGS = 2.7V).
© 2000 SEMTECH CORP.
2
652 MITCHELL ROAD NEWBURY PARK CA 91320
No Preview Available ! |
400mA SmartLDOTM
SC1534
PRELIMINARY - July 26, 2000
ELECTRICAL CHARACTERISTICS
Unless specified, TA = 25°C, VIN = 5V, VAUX = 3.3V, IO = 400mA, CO = 10µF. Values in bold apply over full operating temperature range.
Parameter
Symbol
Test Conditions
MIN TYP MAX Units
VIN
Supply Voltage
VIN
VAUX = 0V
4.35 5.00 5.50 V
Quiescent Current
IQ VIN = 5V, VAUX = 0V, IO = 0mA
8.0 11.0 mA
13.0
VIN = 5V, VAUX = 3.3V, IO = 0mA
10.0 14.0 mA
15.0
Reverse Leakage From VAUX
IVIN
VAUX = 3.6V, VIN = 0V, IO = 0mA
-1.5 -3.0 mA
-4.0
VAUX
Supply Voltage
VAUX
3.0 3.3 3.6 V
Quiescent Current
IQ(AUX)
VAUX = 3.3V, VIN = 0V, IO = 0mA
8.0 11.0 mA
13.0
VAUX = 3.3V, VIN = 5V, IO = 0mA
1.5 2.5 mA
3.0
Reverse Leakage From VIN
5V Detect(1)(2)(3)
IVAUX
VIN = 5.5V, VAUX = 0V, IO = 0mA
-5.0 -50.0 µA
-100.0
Low Threshold Voltage
VTH(LO)
VIN Falling, IO = 20mA
3.92 4.05 4.18
3.90 4.20
V
Hysteresis
VHYST
90 170
80
mV
High Threshold Voltage
VO
VTH(HI)
VIN Rising, IO = 20mA
4.35 V
LDO Output Voltage
Output Current
Line Regulation
VO
IO
REG(LINE)
IO = 20mA
4.35V ≤ VIN ≤ 5.5V, 0mA ≤ IO ≤ 400mA
VIN = 4.35V to 5.5V
3.267 3.300 3.333
3.234
3.366
400
0.20 0.60
0.80
V
mA
%
Load Regulation
REG(LOAD)
IO = 20mA to 400mA
0.20 0.80
1.00
%
© 2000 SEMTECH CORP.
3
652 MITCHELL ROAD NEWBURY PARK CA 91320
Скачать PDF:
[ SC1534.PDF Даташит ]
Номер в каталоге | Описание | Производители |
SC1531 | 200mA & 250mA SmartLDOs | Semtech Corporation |
SC1531A | 200mA & 250mA SmartLDOs | Semtech Corporation |
SC1531ACSTR | 200mA & 250mA SmartLDOs | Semtech Corporation |
SC1531CSTR | 200mA & 250mA SmartLDOs | Semtech Corporation |
Номер в каталоге | Описание | Производители |
TL431 | 100 мА, регулируемый прецизионный шунтирующий регулятор |
Unisonic Technologies |
IRF840 | 8 А, 500 В, N-канальный МОП-транзистор |
Vishay |
LM317 | Линейный стабилизатор напряжения, 1,5 А |
STMicroelectronics |
DataSheet26.com | 2020 | Контакты | Поиск |