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SC1543 PDF даташит

Спецификация SC1543 изготовлена ​​​​«Semtech Corporation» и имеет функцию, называемую «400mA/200mA Dual 3.3V Smart Power Switch».

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Номер произв SC1543
Описание 400mA/200mA Dual 3.3V Smart Power Switch
Производители Semtech Corporation
логотип Semtech Corporation логотип 

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SC1543 Даташит, Описание, Даташиты
400mA/200mA Dual 3.3V Smart
Power Switch
SC1543
PRELIMINARY - October 9, 2000
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
FEATURES
The SC1543 provides a glitch free 3.3V output when
one of two 3.3V input sources is present. It does not
require external logic to sequence from one input
source to the other. Whenever VIN1 exceeds a
predetermined threshold value the internal MOSFET
connects it’s source voltage to the output. If the input at
VIN1 is below the threshold another internal MOSFET
connects VIN2 to the output. If both inputs are at 3.3V
then VIN1 will be connected to the output.
The SC1543 is designed to provide 400mA from the
main input (VIN1) and 200mA from the secondary input
(VIN2). A very low quiescent current of 10µA in
shutdown mode reduces power dissipation.
The internal logic and control circuit detects the voltage
levels of VIN1 and VIN2, and compares them to an
input reference voltage of 2.9V. An internally controlled
period of switch overlap ensures that the transition
between supplies is as glitch-free as possible.
The SC1543 is available in an MSOP-8 surface mount
package.
= Glitch free transitions between inputs
= Internal logic selects appropriate input
= 400mA load current capability from main input
= Low power shutdown mode
= Industrial temperature range
APPLICATIONS
= Mini PCI cards
= Peripheral cards
= Instantly available personal computers (IAPCs)
ORDERING INFORMATION
Part Number(1)
Package
SC1543IMSTR
MSOP-8
Note:
(1) Only available in tape and reel packaging. A reel
contains 2500 devices.
APPLICATION CIRCUIT
SHUTDOWN
3.3V IN
3.3VAUX IN
CIN1
1uF
CIN2
1uF
U1
1 VIN1 SHDN 8
2 VIN1 VOUT 7
3 VIN2 VOUT 6
45
VIN2 GND
SC1543
3.3V OUT
COUT
10uF
© 2000 SEMTECH CORP.
1
652 MITCHELL ROAD NEWBURY PARK CA 91320









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SC1543 Даташит, Описание, Даташиты
400mA/200mA Dual 3.3V Smart
Power Switch
PRELIMINARY - October 9, 2000
ABSOLUTE MAXIMUM RATINGS
Parameter
Input Supply Voltage
Output Current From:
VIN1
VIN2
Operating Ambient Temperature Range
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering, 10 Sec.)
Thermal Impedance Junction to Ambient
Symbol
VIN1,2
IO
TA
TJ
TSTG
TLEAD
θJA
Maximum
-0.5 to +6
400
200
-40 to +85
-40 to +125
-65 to +150
300
206
SC1543
Units
V
mA
°C
°C
°C
°C
°C/W
ELECTRICAL CHARACTERISTICS(1)
Unless specified, TA = 25°C, SHDN = 0V, CO = 10µF, IO = 400mA (when power is being supplied from VIN1, 200mA when power is being sup-
plied from VIN2). Values in bold apply over full operating temperature range.
Parameter
Symbol
Conditions
Min Typ Max Units
VIN1
Supply Voltage
VIN1
3.0 3.3 3.6 V
Quiescent Current
IQ1 VIN1 > VIN2, IO = 0mA
VIN1 < VIN2
150 300 µA
15 50
Reverse Leakage From VIN2(2)
VIN2
IVIN1
VIN1 = SHDN = 3.3V
VIN1 = 0V, VIN2 = 3.6V, IO = 0mA
1 10
0.25 1.00 µA
Supply Voltage
VIN2
3.0 3.3 3.6 V
Quiescent Current
IQ2 VIN2 > VIN1, IO = 0mA
VIN2 < VIN1
150 300 µA
1 10
Reverse Leakage From VIN1(2)
VIN1 Threshold Voltage
IVIN2
VIN2 = SHDN = 3.3V
VIN1 = 3.6V, VIN2 = 0V, IO = 0mA
1 10
0.25 1.00 µA
Threshold Voltage
Hysteresis
Power Switches
VIN1
Pass
Device
R (2)
DS(ON)
VIN2
Pass
Device
R (2)
DS(ON)
VTH
VHYST
RDS(ON)1
RDS(ON)2
VIN1 = 3.3V, VIN2 = 0V
VIN1 = 0V, VIN2 = 3.3V
2.80 2.90 3.00 V
130 mV
100 250 m
150 400 m
© 2000 SEMTECH CORP.
2
652 MITCHELL ROAD NEWBURY PARK CA 91320









No Preview Available !

SC1543 Даташит, Описание, Даташиты
400mA/200mA Dual 3.3V Smart
Power Switch
SC1543
PRELIMINARY - October 9, 2000
ELECTRICAL CHARACTERISTICS(1) (Cont.)
Unless specified, TA = 25°C, SHDN = 0V, CO = 10µF, IO = 400mA (when power is being supplied from VIN1, 200mA when power is being sup-
plied from VIN2). Values in bold apply over full operating temperature range.
Parameter
Symbol
Conditions
Min Typ Max Units
SHDN
Input High Voltage
Input Low Voltage
Over Temperature Protection
High Trip Level
Hysteresis
VIH
VIL
THI
THYS
1.8 V
0.4 V
165 °C
20 °C
NOTES:
(1) This device is ESD sensitive. Use of standard ESD handling precautions is required.
(2) Guaranteed by design.
OUTPUT TRUTH TABLE
Input Conditions(1)
VOUT
VIN1 > VTH
VIN1 < VTH
Connected to VIN1
Connected to greater of VIN1 and VIN2
NOTES:
(1) See Electrical Characteristics for definition for VTH.
© 2000 SEMTECH CORP.
3
652 MITCHELL ROAD NEWBURY PARK CA 91320










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