SC4431CSK-2TR [SEMTECH]
SHUNT REGULATOR WITH OPEN COLLECTOR OR OUTPUT; 集电极开路或输出并联稳压器
| 型号： | SC4431CSK-2TR |
| 厂家： | 
SEMTECH CORPORATION |
| 描述： | SHUNT REGULATOR WITH OPEN COLLECTOR OR OUTPUT |
| 文件： | 总5页 (文件大小：54K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SHUNT REGULATOR WITH OPEN
COLLECTOR OR OUTPUT
SC4431
PRELIMINARY - September 11, 2000
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
FEATURES
The SC4431 is a four terminal device for regulating an
isolated power supply with very low output voltage.
•= Trimmed bandgap design - initial accuracies to
+ 0.5%
•= 40mA drive capability
It is intended to be used as a replacement for three ter-
minal shunt regulators such as SC431L where the out-
put voltage is too low for them to function in conjunc-
tion with an opto-isolator. It achieves this by having
seperate supply and output pins, allowing the output to
sink current at voltages as low as 0.2V, while the sup-
ply pin still has sufficient voltage for the device to func-
tion. In this way, allowing for a 1.6V drop through an
opto-isolator diode, regulation down to 1.8V out can be
achieved.
•= Wide supply voltage range - 1.5V to 15V
•= Low supply current - typically 110µA
•= Full industrial temperature range
APPLICATIONS
•= Opto driver for very low output voltage isolated
power supplies
The SC4431 shunt regulator is available with three ini-
tial reference voltage accuracies (0.5%, 1.0% and
2.0%) in the space saving 5-lead SOT-23 package.
The three voltage tolerances allow the designer the
opportunity to select the proper cost/tolerance for their
application.
ORDERING INFORMATION
Part Number(1)(2)
Package
SC4431CSK-X.TR
SOT-23-5
Notes:
(1) Where “-X” denotes initial reference voltage toler-
ance. Available options are ±0.5% (-.5), ±1% (-1) and
±2% (-2).
(2) Only available in tape and reel packaging. A reel
contains 3000 devices.
TYPICAL APPLICATION CIRCUIT
2V OUT
T1
Primary Side
Controller
Secondary Side
Rectification
VIN
and Filtering
R1
R2
C1
U1
5.1k
33nF
R3
6.34k
1
U2
SC4431
VCC
5
4
3
OUT
REF
NC
4N25
R4
C2
22nF
10k
GND
2
2V Output Isolated Power Supply
1
© 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
SHUNT REGULATOR WITH OPEN
COLLECTOR OR OUTPUT
SC4431
PRELIMINARY - September 11, 2000
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
VCC
Maximum
-0.5 to +16
-0.5 to VCC
-0.5 to +4
40
Units
V
Input Supply Voltage
Output Voltage
VOUT
VREF
IOUT
V
Reference Voltage
V
Continuous Output Current
Reference Input Current
Operating Ambient Temperature Range
mA
mA
°C
IREF
5
TA
-40 to +85
Operating Junction Temperature Range
Storage Temperature Range
TJ
TSTG
θJA
-40 to +150
°C
°C
-65 to +150
Thermal Impedance Junction to Ambient
Thermal Impedance Junction to Case
Power Dissipation at TA = 25°C
256
81
°C/W
°C/W
mW
°C
θJC
PD
475
300
2
Lead Temperature (Soldering) 10 seconds
ESD Rating (Human Body Model)
TLEAD
ESD
kV
ELECTRICAL CHARACTERISTICS
Unless specified, TA = 25°C, VCC = 2V, IOUT = 2mA. Values in bold apply over full operating temperature range.
Parameter
Symbol
Test Conditions
MIN TYP MAX Units
VCC
Input Supply Voltage
Input Supply Current
Off State Input Supply Current
VCC
ICC
V
1.5
15
VREF = VOUT
110
65
µA
µA
200
100
150
ICC(OFF)
VREF = 1.187V, VOUT = 2V
REF
Reference Voltage
VREF
SC4431-.5, VREF = VOUT
SC4431-1, VREF = VOUT
SC4431-2, VREF = VOUT
VCC = 1.5V to 15V
1.219 1.224 1.231
1.207 1.243
1.212 1.224 1.236
1.200 1.250
1.200 1.224 1.250
V
V
V
1.187
1.261
15
Change in VREF due to change
dVREF
dVCC
8
8
mV
mV
in VCC
20
Change in VREF due to change
in IOUT
IOUT = 0.1mA to 40mA
28
dVREF
dIOUT
36
2
© 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
SHUNT REGULATOR WITH OPEN
COLLECTOR OR OUTPUT
SC4431
PRELIMINARY - September 11, 2000
ELECTRICAL CHARACTERISTICS (Cont.)
Unless specified, TA = 25°C, VCC = 2V, IOUT = 2mA. Values in bold apply over full operating temperature range.
Parameter
Symbol
Test Conditions
MIN TYP MAX Units
REF (Cont.)
Reference Input Current
IREF
0.3
50
0.5
µA
0.1mA ≤ IOUT ≤ 10mA
1.0
OUT
Saturation Voltage
VOUT(SAT)
IOUT = 5mA, ICC = 500µA
REF = 1.261V, IOUT = 40mA
75
mV
mV
µA
100
V
275 300
400
Off State Output Current
IOUT(OFF)
VREF = 1.187V, VOUT = 2V
0.5
1
10
3
© 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
SHUNT REGULATOR WITH OPEN
COLLECTOR OR OUTPUT
SC4431
PRELIMINARY - September 11, 2000
BLOCK DIAGRAM
PIN CONFIGURATION
SOT-23 -5 Lead (Top View)
PIN DESCRIPTION
Pin Pin Name Pin Function
1
2
3
4
5
VCC
GND
NC
This is the input supply pin for the IC.
Logic and power ground.
No connection.
REF
OUT
This is connected to the non-inverting input of the error amplifier.
This is the output pin of the device, essentially an open collector.
4
© 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
SHUNT REGULATOR WITH OPEN
COLLECTOR OR OUTPUT
SC4431
PRELIMINARY - September 11, 2000
DEVICE OUTLINE - SOT-23-5
LAND PATTERN - SOT-23-5
ECN 00-1315
5
© 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
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