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SC1537CMTR PDF даташит

Спецификация SC1537CMTR изготовлена ​​​​«Semtech Corporation» и имеет функцию, называемую «700mA SmartLDOTM».

Детали детали

Номер произв SC1537CMTR
Описание 700mA SmartLDOTM
Производители Semtech Corporation
логотип Semtech Corporation логотип 

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SC1537CMTR Даташит, Описание, Даташиты
700mA SmartLDOTM
SC1537
PRELIMINARY - July 25, 2000
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
FEATURES
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.
= 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
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 RDS(ON) of
100mis recommended.
APPLICATIONS
= Desktop Computers
= Network Interface Cards (NICs)
= PCMCIA/PCI Interface Cards
= CardbusTM Technology
= Power supplies with multiple input sources
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.
Q1
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.
APPLICATION CIRCUIT
3.3V
5V
C1
0.1uF
C2
10uF
C3
0.1uF
U1 SC1537CS
1
2
3
4
VAUX GND
VIN GND
VO GND
DR GND
8
7
6
5
3.3V OUT
C4
10uF
C5
0.1uF
Q1
5V
3.3V
C1
0.1uF
C2
10uF
C3
0.1uF
U1 SC1537CM
2 VIN TAB DR 5
14
VAUX GND VO
3
C4
10uF
3.3V OUT
C5
0.1uF
NOTE:
(1) External switch (Q1): use a low threshold P-channel MOSFET such as Vishay Si2305DS (RDS(ON) < 71mat
VGS = 2.5V) or International Rectifier IRLML6401 (RDS(ON) < 85mat VGS = 2.5V), or equivalent.
© 2000 SEMTECH CORP.
1
652 MITCHELL ROAD NEWBURY PARK CA 91320









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SC1537CMTR Даташит, Описание, Даташиты
700mA SmartLDOTM
SC1537
PRELIMINARY - July 25, 2000
ABSOLUTE MAXIMUM RATINGS
Parameter
Input Supply Voltage
Auxiliary Supply Voltage
LDO Output Current
Operating Ambient Temperature Range
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering) 10 Sec
Thermal Impedance Junction to Ambient
SO-8(1)
TO-263
Thermal Impedance
Junction to Case
SO-8
TO-263
ESD Rating (Human Body Model)
Symbol
VIN
VAUX
IO
TA
TJ
TSTG
TLEAD
θJA
θJ C
ESD
Note:
(1) 1 inch square of 1/16” FR-4, double sided, 1 oz. minimum copper weight.
Maximum
-0.5 to +7
-0.5 to +7
10 to 700
0 to +70
0 to +125
-65 to +150
300
65
60
39
3
2
Units
V
V
mA
°C
°C
°C
°C
°C/W
°C/W
kV
ELECTRICAL CHARACTERISTICS
Unless specified, TA = 25°C, VIN = 5V, VAUX = 3.3V, IO = 700mA, 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
4.75 5.00 5.25 V
Quiescent Current
IQ VIN = 5V, VAUX = 0V, IO = 0mA
9.0 14.0 mA
16.0
VIN = 5V, VAUX = 3.3V, IO = 0mA
13.0 17.0 mA
18.0
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
© 2000 SEMTECH CORP.
2
652 MITCHELL ROAD NEWBURY PARK CA 91320









No Preview Available !

SC1537CMTR Даташит, Описание, Даташиты
700mA SmartLDOTM
SC1537
PRELIMINARY - July 25, 2000
ELECTRICAL CHARACTERISTICS
Unless specified, TA = 25°C, VIN = 5V, VAUX = 3.3V, IO = 700mA, CO = 10µF. Values in bold apply over full operating temperature range.
Parameter
Symbol
Test Conditions
MIN TYP MAX Unit
VAUX (Cont.)
Reverse Leakage From VIN IVAUX
5V Detect(1)(2)(3)
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 V
3.90 4.20
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
3.267
4.75V VIN 5.25V, 0mA IO 700mA 3.234
VIN = 4.75V to 5.25V
3.300
0.20
3.333 V
3.366
400 mA
0.60 %
0.80
Load Regulation
REG(LOAD)
IO = 10mA to 700mA
0.6 1.0 %
1.2
Drive Output
Drive Voltage
VDR
4.75V VIN 5.25V, IDR = 200µA
3.4 VIN - 0.8
3.3
V
VIN < VTH(LO), IDR = -200µA
35 150 mV
250
Peak Drive Current
Drive High Delay(1)(4)
Drive Low Delay(1)(4)
IDR(PK)
tDH
tDL
Sinking: VIN = 3.9V, VDR = 1V;
Sourcing: VIN = 4.35V, VIN - VDR = 2.5V
CDR = 1.2nF, VIN ramping up, measured
from VIN = VTH(HI) to VDR = 2V
CDR = 1.2nF, VIN ramping down,
measured
7
6
mA
0.5 1.0 µs
2.0
0.5 1.0 µs
from VIN = VTH(LO) to VDR = 2V
2.0
NOTES:
(1) Guaranteed by design.
(2) See 5V Detect Thresholds on page 5.
(3) Recommended source impedance for 5V supply: 0.07. This will ensure that IO x RSOURCE < VHYST, thus
avoiding DR toggling during 5V detect threshold transitions.
(4) See Timing Diagram on page 5.
3
© 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320










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Номер в каталогеОписаниеПроизводители
SC1537CMTR700mA SmartLDOTMSemtech Corporation
Semtech Corporation

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