SC4431CSK-X [SEMTECH]
Shunt Regulator With Open Collector Output; 并联稳压器采用集电极开路输出
| 型号： | SC4431CSK-X |
| 厂家： | 
SEMTECH CORPORATION |
| 描述： | Shunt Regulator With Open Collector Output |
| 文件： | 总8页 (文件大小：285K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SC4431
Shunt Regulator With
Open Collector Output
POWER MANAGEMENT
Features
Description
The SC4431 is a four terminal device for regulating an
isolated power supply with output voltages down to 1.5V.
Open Collector output drives Optoisolator with
as little as 1.5V input voltage
Trimmed bandgap design - initial accuracies
to + 0.5%
40mA drive capability
Regulates output as low as 50mV
Wide supply voltage range - 1.5V to 15V
Low supply current - typically 110µA
Full industrial temperature range
SOT-23 5 lead package
It is intended to be used as a replacement for three
terminal shunt regulators such as SC431L where the
output voltage is too low for the device to function in
conjunction with an opto-isolator. SC4431 achieves this
by having seperate supply and output pins, allowing the
output to sink current at voltages as low as 0.1V, while
the supply pin still has sufficient voltage for the device to
function. In this way, allowing for a 1.4V drop through an
opto-isolator diode, regulation down to 1.5V out can be
achieved.
Applications
Telecom Power Supplies
Opto driver for very low output voltage (1.5V)
isolated power supplies
The SC4431 shunt regulator is available with three
initial 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
Battery operated applications
opportunity to select the proper cost/tolerance for their Point of use power supplies
application.
Typical Application Circuit
2V Output Isolated Power Supply
2V OUT
T1
Primary Side
Controller
Secondary Side
Rectification
VIN
and Filtering
R1
R2
C1
5.1k
U1
C3
33nF
R3
SC4431
VCC
6.34k
1
2
5
OUT
4
REF
4N25
C2
R4
22nF
10k
3
NC
GND
1
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Revision September 9 ,2003
SC4431
Shunt Regulator With
Open Collector Output
POWER MANAGEMENT
Absolute Maximum Rating
Parameter
Input Supply Voltage
Vcc pin current
Symbol
VCC
ICC
VOUT
VREF
IOUT
IREF
TA
TJ
TSTG
θJA
Maximum
-0.5 to +16
Units
V
mA
V
8
Output Voltage
-0.5 to VCC
-0.5 to +4
Reference Voltage (1)
V
Continuous Output Current
Reference Input Current
40
mA
mA
°C
°C
°C
°C/W
°C/W
mW
°C
5
-40 to +85
-40 to +150
-65 to +150
256
Operating Ambient Temperature Range
Operating Junction Temperature Range
Storage Temperature Range
Thermal Impedance Junction to Ambient
Thermal Impedance Junction to Case
Power Dissipation at TA = 25°C
Lead Temperature (Soldering) 10 seconds
ESD Rating (Human Body Model)
81
475
300
2
θJC
PD
TLEAD
ESD
kV
(1) If Vref will be forced above 1.224V, a resistor must be placed in series with the Vcc to limit the Icc current
below 5mA.
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
ICC(OFF)
1.5
15
V
µA
µA
VREF = VOUT
VREF = 1.187V, VOUT = 2V
110
65
200
100
150
REF
Reference Voltage
VREF
SC4431-.5, VREF = VOUT
SC4431-1, VREF = VOUT
SC4431-2, VREF = VOUT
VCC = 1.5V to 15V
1.219
1.207
1.212
1.200
1.200
1.187
1.224
1.224
1.224
8
1.231
1.243
1.236
1.250
1.250
1.261
15
V
V
V
Change in VREF due to change in
Vcc
Change in VREF due to change in
dVREF/dVCC
dVREF/dIOUT
mV
mV
20
IOUT = 0.1mA to 40mA
8
28
IOUT
36
Reference Input Current
IREF
0.1mA ≤ IOUT ≤ 10mA
0.3
0.5
µA
1.0
OUT
Saturation Voltage
VOUT(SAT)
IOUT = 5mA, ICC = 500µA
VREF = 1.261V, IOUT = 40mA
VREF = 1.187V, VOUT = 2V
50
75
100
300
400
1
mV
mV
µA
275
0.50
Off State Output Current
IOUT(OFF)
10
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2003 Semtech Corp.
2
SC4431
Shunt Regulator With
Open Collector Output
POWER MANAGEMENT
Pin Configurations
Ordering Information
Part Number(1)(2)
SC4431CSK-X
Package
SOT-23-5
(TOP VIEW)
Notes: (1) Only available in tape and reel packaging.
(Suffix ‘.TR’ e.g. SC4431CSK-X.TR).
(2) Where “-X” denotes initial reference voltage toler-
ance. Available options are ±0.5% (-.5), ±1% (-1) and
±2% (-2).
(SOT-23-5 Lead)
Pin Descriptions
Pin#
Pin Name Pin Function
1
VCC
This is the input supply pin for the SC4431. A low ESR capacitor should be used to bypass this
pin to GND right at the IC.
2
3
4
5
GND
NC
REF
OUT
Logic and power ground.
No connection.
This is connected to the non-inverting input of the error amplifier.
This is the output pin of the device, essentially an open collector.
Note: A 22nF low ESR (ceramic) capacitor is required from
this pin to GND for stable operation.
Marking Information
Block Diagram
Top Mark
4431
Bottom Mark
yyww
yyww = Datecode(Example:9908)
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2003 Semtech Corp.
3
SC4431
Shunt Regulator With
Open Collector Output
POWER MANAGEMENT
Typical Characteristics
Vrefvs Ta Vcc = 2V
Vrefvs Ta Iout= 2m A
1 .23 6
1 .23 4
1 .23 2
1 .23 0
1 .22 8
1 .22 6
1 .22 4
1 .22 2
1 .22 8
1 .22 7
1 .22 6
1 .22 5
1 .22 4
1 .22 3
1 .22 2
1 .22 1
1 .22 0
1 .21 9
1 .21 8
V
V
V
V
cc= 1 .5 V
cc= 2 V
Iout= 40m
a
cc= 5 V
Iout= 2m
A
cc= 1 5V
Iout= 100 uA
-4 0 -3 0 -2 0 -1 0
0
1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0
-4 0 -3 0 -2 0 -1 0
0
1 0 2 0 3 0 4 0
5 0 6 0 7 0 8 0
Ta(Deg.C.)
Ta(Deg.C.)
Typical Vref vs Ta Vcc = 2V
Typical Vref vs Ta Io = 2mA
Icc O ffvs Ta Vout= 2V
Irefvs Ta Vout= 2V
7 0E -6
6 5E -6
6 0E -6
5 5E -6
5 0E -6
1 3E -9
Icc_O ff
Ire f
1 2E -9
1 1E -9
1 0E -9
9 E -9
8 E -9
7 E -9
6 E -9
5 E -9
4 E -9
-4 0 -3 0 -2 0 -1 0
0
1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0
-4 0 -3 0 -2 0 -1 0
0
1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0
Ta(Deg.C.)
Ta(Deg.C.)
Typical Iout vs Ta Vo = 2V
Typical Icc Off vs Ta Vo = 2V
Irefvs Ta Vcc = 2V
Vsatvs Ta Vcc = 2V
4 5 E -9
Iout= 100 uA
3 50
3 00
2 50
2 00
1 50
1 00
5 0
Iout= 40m
Iout= 5m
a
Iout= 1m
A
A
A
A
Iout= 2m
Iout= 5m
4 0 E -9
3 5 E -9
3 0 E -9
2 5 E -9
2 0 E -9
Iout= 10m
Iout= 15m
A
A
0
-4 0 -3 0 -2 0 -1 0
0
1 0 2 0 3 0 4 0
5 0
6 0 7 0
8 0
-4 0 -3 0 -2 0 -1 0
0
1 0 2 0 3 0 4 0
5 0
6 0 7 0
8 0
Ta(Deg.C.)
Ta(Deg.C.)
Typical Vsat vs Ta Vcc = 2V
Typical Iref vs Ta Vcc = 2V
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2003 Semtech Corp.
4
SC4431
Shunt Regulator With
Open Collector Output
POWER MANAGEMENT
Typical Characteristics
3.5000
3.0000
2.5000
2.0000
1.5000
1.0000
0.5000
0.0000
-0.5000
3.5000
3.0000
2.5000
2.0000
1.5000
1.0000
0.5000
0.0000
-0.5000
1.2243
1.2700
1.3009
1.7073
3.0073
1.2248
1.2703
1.3048
1.7030
3.0182
Vref(v)
Vref(v)
Vcc=2V,Io=1.3mA
Vcc=5V,Io=1.3mA
Vcc=15V,Io=1.3mA
Vcc=2V,Io=2mA
Vcc=5V,Io=2mA
Vcc=15V,Io=2mA
Typical Icc vs Vref, Io = 1.3mA, Ta = 25 Deg.C.
Typical Icc vs Vref, Io = 2mA, Ta = 25 Deg.C.
+VCC
J1
+V adj
C1
1
+Vref_Adjust
10uF
2
R1
4k
C3
R2
Io
J2
3.9k
1
U1
2
R4
1k
C2
1
10uF
5
Vref
Vo
J3
C4
10uF
4
C5
1
22nF
2
R5
1k
Vref
SC4431
2
Icc vs Vref Test Circuit
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2003 Semtech Corp.
5
SC4431
Shunt Regulator With
Open Collector Output
POWER MANAGEMENT
Typical Gain Phase
SC4431 Gain / Phase Vin = 2V, Iout = 2mA, Vout = 1.6V
70
200
150
100
50
60
50
40
30
20
10
0
Gain
Phase
0
-50
-100
-10
-20
-150
10
100
1000
10000
100000
1000000
Freq (Hz)
SC4431 Gain / Phase Vin = 4V, Iout = 2mA, Vout = 2V
80
70
60
50
40
30
20
10
0
200
150
100
50
Gain
Phase
0
-50
-10
-20
-100
1000000
10
100
1000
10000
100000
Freq (Hz)
R1
J1
A
J2
R
1
2
3
4
5
1 2 3 4 5
1k for 2mA
U1
J3
2V OUT
1
5
4
1
VCC
OUT
REF
2
GND
4V IN
3
R2
NC
3.16k
SC4431
R3
C3
C1
10u
C2
0.1u
C4
C5
22u
C6
22u
22u
5.1k
33n
R4
C7
4.99k
22n
J4
1
J5
GND
1
2
3
4
5
Signal In
Gain Phase Test Circuit
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2003 Semtech Corp.
6
SC4431
Shunt Regulator With
Open Collector Output
POWER MANAGEMENT
Typical Applications
+V Monitor
+Vcc
Power Good
R2
R3
C1
R1
R4
R5
U1
1
5
Q1
4
C3
C2
22nF
C4
Vref
SC4431
2
Power good Circuit
+Vcc
+Vout Secondary
C1
R1
R2
+Vprimary
R3
1
R4
5
4
U2
C3
C2
22n
U1
SC4431
C4
PWM disable
R5
Vref
2
Isolated OVP Circuit
+Vin
+Vout
Q1
C1
R1
R2
U1
R3
1
5
4
C2
C3
R4
22nF
Vref
SC4431
2
Linear Regulator Circuit
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2003 Semtech Corp.
7
SC4431
Shunt Regulator With
Open Collector Output
POWER MANAGEMENT
Outline Drawing
SOT-23- 5L
ECN00 - 881
Land Pattern
SOT- 23- 5L
ECN00 - 881
Contact Information
Semtech Corporation
Power Management Products Division
200 Flynn Road, Camarillo, CA 93012
Phone: (805)498-2111 FAX (805)498-3804
www.semtech.com
2003 Semtech Corp.
8
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