S-1142 Datasheet PDF
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Rev.1.0_03
HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION
LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
The S-1142 Series, developed based on high-withstand voltage CMOS
process, is a positive voltage regulator with a high-withstand voltage, low
current consumption, and high output voltage accuracy. The S-1142
Series operates at a high maximum operating voltage of 50 V and a low
current consumption of 4.0 µA (typ.). In addition to a built-in low
on-resistance transistor which provides a very small dropout voltage and
a large output current, this voltage regulator also has a built-in power-off
circuit.
An overcurrent protector prevents the load current from exceeding the
capacitance of the output transistor. A built-in thermal shutdown circuit
prevents damage caused by heat.
A high heat radiation HSOP-6 package enables high-density mounting.
„ Features
Output voltage :
2.0 V to 12.0 V, selectable in 0.1 V step
Low equivalent series resistance capacitor : Ceramic capacitor of 0.1 µF or more can be used as the I/O capacitor.
Input voltage :
3.0 V to 50 V
High-accuracy output voltage :
±1.0% (at Tj = +25°C), ±3.0% (Tj = 40°C to +105°C)
Low current consumption :
During operation: 4.0 µA typ., 9.0 µA max. (Tj = 40°C to +105°C)
Output current :
During shutdown: 0.1 µA typ., 1.0 µA max. (Tj = 40°C to +105°C)
200 mA (at VIN VOUT(S) + 2.0 V)*1
Built-in overcurrent protector :
limits overcurrent of output transistor
Operation temperature range :
40°C to +105°C (S-1142xxxH only)
Built-in thermal shutdown circuit :
prevents damage caused by heat
Built-in power on/off circuit :
longer battery life
Small package :
HSOP-6
Lead-free product
www.Data*S1h.eAett4teUn.ctioomn should be paid to the power dissipation of the package when the output current is large.
„ Applications
Constant-voltage power supply for electrical applications for vehicle interiors (S-1142xxxH only)
Constant-voltage power supplies for home electric appliances
„ Package
Package Name
HSOP-6
Package
FH006-A
Drawing Code
Tape
Reel
FH006-A
FH006-A
Land
FH006-A
Caution Before using this product in medical equipment or automobile equipment including car audio, keyless
entry and engine control unit, contact to SII is indispensable.
Seiko Instruments Inc.
1


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HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
„ Block Diagram
Rev.1.0_03
*1
VIN
Overcurrent
protector
Thermal shutdown circuit
VOUT
ON/OFF
ON/OFF circuit
+
Reference
voltage circuit
VSS
*1. Parasitic diode
Figure 1
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Rev.1.0_03
HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
„ Product Name Structure
Users can select the product type, output voltage, and package type for the S-1142 Series. For the contents of
product name, refer to “1. Product Name”, “2. Product Name List” for details of product names.
1. Product Name
S-1142 x xx x - xxxx U
Package abbreviation and IC packing specifications*1
E6T1 : HSOP-6, Tape (S-1142xxxI only)
E6T2 : HSOP-6, Tape (S-1142xxxH only)
Operating temperature
I : 40°C to +85°C
H : 40°C to +105°C
Value of output voltage
20 to C0
(e.g., when the output voltage is 2.0 V, it is expressed as 20.
when the output voltage is 10 V, it is expressed as A0.
when the output voltage is 11 V, it is expressed as B0.
when the output voltage is 12 V, it is expressed as C0.)
Product type*2
A : ON/OFF pin negative logic
B : ON/OFF pin positive logic
*1. Refer to the tape specifications.
*2. Refer to “3. Power-off pin (ON/OFF pin)” in “„ Operation”.
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HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
Rev.1.0_03
2. Product Name List
Output Voltage
2.0 V ±1.0%
2.5 V ±1.0%
2.7 V ±1.0%
2.8 V ±1.0%
2.85 V ±1.0%
3.0 V ±1.0%
3.2 V ±1.0%
3.3 V ±1.0%
3.5 V ±1.0%
3.7 V ±1.0%
4.0 V ±1.0%
5.0 V ±1.0%
8.0 V ±1.0%
Table 1
HSOP-6 (+85°C supported)
S-1142B20I-E6T1U
S-1142B25I-E6T1U
S-1142B27I-E6T1U
S-1142B28I-E6T1U
S-1142B2JI-E6T1U
S-1142B30I-E6T1U
S-1142B32I-E6T1U
S-1142B33I-E6T1U
S-1142B35I-E6T1U
S-1142B37I-E6T1U
S-1142B40I-E6T1U
S-1142B50I-E6T1U
S-1142B80I-E6T1U
HSOP-6 (+105°C supported)
S-1142B20H-E6T2U
S-1142B25H-E6T2U
S-1142B27H-E6T2U
S-1142B28H-E6T2U
S-1142B2JH-E6T2U
S-1142B30H-E6T2U
S-1142B32H-E6T2U
S-1142B33H-E6T2U
S-1142B35H-E6T2U
S-1142B37H-E6T2U
S-1142B40H-E6T2U
S-1142B50H-E6T2U
S-1142B80H-E6T2U
Remark Please contact our sales office for products with an output voltage other than those listed
above or type A products.
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Rev.1.0_03
HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
„ Pin Configuration
HSOP-6
Top view
65 4
12 3
Figure 2
Table 2
Pin No.
Symbol
Description
1
VOUT
Output voltage pin
2
VSS
GND pin
3 ON/OFF Power-off pin
4
NC*1
No connection
5
VSS
GND pin
6 VIN Input voltage pin
*1. The NC pin is electrically open.
The NC pin can be connected to VIN or VSS.
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HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
Rev.1.0_03
„ Absolute Maximum Ratings
Caution The absolute maximum ratings are rated values exceeding which the product could suffer physical
damage. These values must therefore not be exceeded under any conditions.
Table 3
(Ta = 25°C unless otherwise specified)
Parameter
Symbol
Absolute Maximum Rating
Unit
Input voltage
VIN
VON/OFF
VSS 0.3 to VSS + 60
VSS 0.3 to VIN + 0.3
V
V
Output voltage
Power dissipation
VOUT
PD
VSS 0.3 to VIN + 0.3
1900*1
V
mW
Junction temperature
Tj
40 to +125
°C
Operating ambient S-1142xxxI
temperature
S-1142xxxH
Topr
40 to +85
40 to +105
°C
°C
Storage temperature
Tstg
40 to +125
°C
*1. When mounted on board
[Mounted board]
(1) Board size :
50 mm × 50 mm × t1.6 mm
(2) Board material : Glass epoxy resin (two layers)
(3) Wiring ratio : 50%
(4) Test conditions : When mounted on board (wind speed : 0 m/s)
(5) Land pattern : Refer to the recommended land pattern (drawing code : FH006-A)
2400
2000
1600
1200
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800
S-1142xxxI
400
S-1142xxxH
0
0 50 100 150
Ambient temperature (Ta) [°C]
Figure 3 Power Dissipation of Package (When Mounted on Board)
Condition
HSOP-6 (When mounted on board)
Table 4
Power Dissipation
1900 mW
Thermal Resistance Value (θj a)
53°C/W
6 Seiko Instruments Inc.


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Rev.1.0_03
HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
Power dissipation of HSOP-6 (reference)
Package power dissipation differs depending on the mounting conditions.
The power dissipation characteristics under the following test conditions should be taken as reference values only.
[Mounted board]
(1) Board size :
50 mm × 50 mm × t1.6 mm
(2) Board material : Glass epoxy resin (two layers)
(3) Wiring ratio : 90%
(4) Test conditions : When mounted on board (wind speed : 0 m/s)
(5) Land pattern : Refer to the recommended land pattern (drawing code : FH006-A)
2400
2000
1600
1200
800
S-1142xxxI
400
S-1142xxxH
0
0 50 100 150
Ambient temperature (Ta) [°C]
Figure 4 Power Dissipation of Package (When Mounted on Board)
Condition
HSOP-6 (When mounted on board)
Table 5
Power Dissipation
(Reference)
2000 mW
Thermal Resistance Value
(θj a)
50°C/W
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HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
Rev.1.0_03
„ Electrical Characteristics
1. S-1142xxxI (+85°C supported)
Table 6
(VIN = VOUT(S) +1.0 V, Tj = 40°C to +125°C, Ta = 40°C to +85°C unless otherwise specified)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Test
Circuit
Output voltage*1
VOUT(E)
IOUT = 30 mA, 40°C Tj +105°C
Output current*2
Dropout voltage*3
Line regulation
Load regulation
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Current consumption
during operation
Current consumption
during shutdown
Input voltage
Power-off pin input
voltage “H”
Power-off pin input
voltage “L”
Power-off pin input
current “H”
Power-off pin input
current “L”
Ripple rejection
Short-circuit current
Thermal shutdown
detection temperature
Thermal shutdown
release temperature
IOUT
Vdrop
VOUT1
VIN VOUT
VOUT2
ISS1
ISS2
VIN
VSH
VSL
ISH
ISL
RR
ISHORT
TSD
TSR
VIN VOUT(S) + 2.0 V
IOUT = 100 mA
Ta = +25°C
IOUT = 200 mA
Ta = +25°C
2.0 V VOUT(S) < 2.2 V
2.2 V VOUT(S) < 2.4 V
2.4 V VOUT(S) < 2.6 V
2.6 V VOUT(S) < 3.0 V
3.0 V VOUT(S) < 3.5 V
3.5 V VOUT(S) < 4.0 V
4.0 V VOUT(S) < 5.0 V
5.0 V VOUT(S) < 7.0 V
7.0 V VOUT(S) < 9.0 V
9.0 V VOUT(S) 12.0 V
2.0 V VOUT(S) < 2.2 V
2.2 V VOUT(S) < 2.4 V
2.4 V VOUT(S) < 2.6 V
2.6 V VOUT(S) < 3.0 V
3.0 V VOUT(S) < 3.5 V
3.5 V VOUT(S) < 4.0 V
4.0 V VOUT(S) < 5.0 V
5.0 V VOUT(S) < 7.0 V
7.0 V VOUT(S) < 9.0 V
9.0 V VOUT(S) 12.0 V
VOUT(S) + 1.0 V VIN 30 V, IOUT = 30 mA
VIN = VOUT(S) +1.0 V, 2.0 V VOUT(S) < 5.1 V
0.1 mA IOUT 40 mA
VIN = VOUT(S) +1.0 V, 5.1 V VOUT(S) 12.0 V
0.1 mA IOUT 40 mA
ON/OFF pin = ON, no load
ON/OFF pin = OFF, no load
VIN = VOUT(S) +1.0 V, RL = 1.0 k, determined by
VOUT output level
VIN = VOUT(S) +1.0 V, RL = 1.0 k, determined by
VOUT output level
VIN = VOUT(S) +1.0 V, VON/OFF = VOUT(S) +1.0 V
VIN = VOUT(S) +1.0 V, VON/OFF = 0 V
VIN = VOUT(S) +1.0 V, 2.0 V VOUT(S) < 2.3 V
f = 100 Hz,
2.3 V VOUT(S) < 3.6 V
Vrip = 0.5 Vrms,
3.6 V VOUT(S) < 6.1 V
IOUT = 30 mA,
Ta = +25°C
6.1 V VOUT(S) < 10.1 V
10.1 V VOUT(S) 12.0 V
VIN = VOUT(S) +1.0 V, ON/OFF pin = ON,
VOUT = 0 V, Ta = +25°C
Junction temperature
Junction temperature
VOUT(S)
× 0.97
200*4
3.0
1.5
0.1
0.1
VOUT(S)
1.0
0.8
0.6
0.45
0.35
0.3
0.27
0.23
0.2
0.18
1.12
1.02
0.92
0.82
0.72
0.62
0.55
0.5
0.45
0.4
0.05
20
20
4.0
0.1
50
45
40
35
30
80
150
125
VOUT(S)
× 1.03
0.3
40
60
9.0
1.0
50
0.3
0.1
0.1
V
mA
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
%/V
mV
mV
µA
µA
V
V
V
µA
µA
dB
dB
dB
dB
dB
mA
°C
°C
1
3
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
4
4
4
4
5
5
5
5
5
3
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Rev.1.0_03
HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
*1. VOUT(S) : Specified output voltage
VOUT(E) : Actual output voltage
The output voltage when fixing IOUT (= 30 mA) and inputting VOUT(S) + 1.0 V
*2. The output current at which the output voltage becomes 95% of VOUT(E) after gradually increasing the output current.
*3. Vdrop = VIN1 (VOUT3 × 0.98)
VOUT3 is the output voltage when VIN = VOUT(S) + 2.0 V, and IOUT = 100 mA or 200 mA.
VIN1 is the input voltage at which the output voltage becomes 98% of VOUT3 after gradually decreasing the input
voltage.
*4. The output current can be at least this value.
Due to limitation of the package power dissipation, this value may not be satisfied. Attention should be paid to the
power dissipation of the package when the output current is large.
This specification is guaranteed by design.
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HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
Rev.1.0_03
2. S-1142xxxH (+105°C supported)
Table 7
Parameter
Symbol
(VIN = 13.5 V, Tj = 40°C to +125°C, Ta = 40°C to +105°C unless otherwise specified)
Conditions
Min.
Typ.
Max.
Unit
Test
Circuit
Output voltage*1
Output current*2
Dropout voltage*3
Line regulation
Load regulation
www.DCautarSrehnetecto4nUs.cuommption
during operation
VOUT(E)
IOUT = 30 mA, 40°C Tj +105°C
IOUT
Vdrop
VOUT1
VIN VOUT
VOUT2
VIN VOUT(S) + 2.0 V
IOUT = 100 mA
Ta = +25°C
IOUT = 200 mA
Ta = +25°C
2.0 V VOUT(S) < 2.2 V
2.2 V VOUT(S) < 2.4 V
2.4 V VOUT(S) < 2.6 V
2.6 V VOUT(S) < 3.0 V
3.0 V VOUT(S) < 3.5 V
3.5 V VOUT(S) < 4.0 V
4.0 V VOUT(S) < 5.0 V
5.0 V VOUT(S) < 7.0 V
7.0 V VOUT(S) < 9.0 V
9.0 V VOUT(S) 12.0 V
2.0 V VOUT(S) < 2.2 V
2.2 V VOUT(S) < 2.4 V
2.4 V VOUT(S) < 2.6 V
2.6 V VOUT(S) < 3.0 V
3.0 V VOUT(S) < 3.5 V
3.5 V VOUT(S) < 4.0 V
4.0 V VOUT(S) < 5.0 V
5.0 V VOUT(S) < 7.0 V
7.0 V VOUT(S) < 9.0 V
9.0 V VOUT(S) 12.0 V
VOUT(S) + 1.0 V VIN 30 V, IOUT = 30 mA
VIN = 13.5 V, 2.0 V VOUT(S) < 5.1 V
0.1 mA IOUT 40 mA
VIN = 13.5 V, 5.1 V VOUT(S) 12.0 V
0.1 mA IOUT 40 mA
ISS1 ON/OFF pin = ON, no load
VOUT(S)
× 0.97
200*4
VOUT(S)
1.0
0.8
0.6
0.45
0.35
0.3
0.27
0.23
0.2
0.18
1.12
1.02
0.92
0.82
0.72
0.62
0.55
0.5
0.45
0.4
0.05
20
20
4.0
VOUT(S)
× 1.03
0.3
70
150
9.0
V
mA
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
%/V
mV
mV
µA
1
3
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
Current consumption
during shutdown
Input voltage
Shutdown pin input
voltage “H”
Shutdown pin input
voltage “L”
Shutdown pin input
current “H”
Shutdown pin input
current “L”
ISS2
VIN
VSH
VSL
ISH
ISL
Ripple rejection
RR
Short-circuit current ISHORT
Thermal shutdown
detection temperature
Thermal shutdown
release temperature
TSD
TSR
ON/OFF pin = OFF, no load
VIN = 13.5 V, RL = 1.0 k, determined by VOUT
output level
VIN = 13.5 V, RL = 1.0 k, determined by VOUT
output level
VIN = 13.5 V, VON/OFF = 13.5 V
3.0
1.5
0.1
VIN = 13.5 V, VON/OFF = 0 V
VIN = 13.5 V,
2.0 V VOUT(S) < 2.3 V
f = 100 Hz,
2.3 V VOUT(S) < 3.6 V
Vrip = 0.5 Vrms,
3.6 V VOUT(S) < 6.1 V
IOUT = 30 mA,
Ta = +25°C
6.1 V VOUT(S) < 10.1 V
10.1 V VOUT(S) 12.0 V
VIN = 13.5 V, ON/OFF pin = ON,
VOUT = 0 V, Ta = +25°C
Junction temperature
0.1
Junction temperature
0.1
50
45
40
35
30
80
150
125
2.5 µA 2
50 V
V4
0.3 V 4
0.1 µA 4
0.1 µA 4
dB 5
dB 5
dB 5
dB 5
dB 5
mA 3
− °C
− °C
10 Seiko Instruments Inc.


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Rev.1.0_03
HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
*1. VOUT(S) : Specified output voltage
VOUT(E) : Actual output voltage
The output voltage when fixing IOUT (= 30 mA) and inputting 13.5 V
*2. The output current at which the output voltage becomes 95% of VOUT(E) after gradually increasing the output current.
*3. Vdrop = VIN1 (VOUT3 × 0.98)
VOUT3 is the output voltage when VIN = VOUT(S) + 2.0 V, and IOUT = 100 mA or 200 mA.
VIN1 is the input voltage at which the output voltage becomes 98% of VOUT3 after gradually decreasing the input
voltage.
*4. The output current can be at least this value.
Due to limitation of the package power dissipation, this value may not be satisfied. Attention should be paid to the
power dissipation of the package when the output current is large.
This specification is guaranteed by design.
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HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
„ Test Circuit
1.
VIN VOUT
ON/OFF
VSS
Set to power ON
+
A
+
V
Figure 5
2. +
A VIN
VOUT
ON/OFF
VSS
Set to VIN or GND
Figure 6
3.
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VIN VOUT
ON/OFF
VSS
Set to power ON
Figure 7
+
A
+
V
VIN VOUT
+
A ON/OFF
VSS
+
V
RL
Rev.1.0_03
Figure 8
5.
VIN VOUT
ON/OFF
VSS
+
V RL
Set to power ON
Figure 9
12 Seiko Instruments Inc.


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Rev.1.0_03
HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
„ Standard Circuit
Input
CIN*1
VIN VOUT
ON/OFF
VSS
Output
CL*2
Single GND
GND
*1. CIN is a capacitor for stabilizing the input.
*2. Ceramic capacitor of 0.1 µF or more can be used as CL.
Figure 10
Caution The above connection diagram and constants will not guarantee successful operation. Perform
thorough evaluation using an actual application to set the constants.
„ Application Conditions
Input capacitor (CIN) : 0.1 µF or more
Output capacitor (CL) : 0.1 µF or more (ceramic capacitor)
Caution Generally, series regulator may oscillate depending on the external components. Confirm that no
oscillation occur in the application for which the above capacitors are used.
„ Selection of Input and Output Capacitors (CIN, CL)
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The S-1142 Series requires an output capacitor between the VOUT and VSS pins for phase compensation. Operation
is stabilized by a ceramic capacitor with an output capacitance of 0.1 µF or more over the entire temperature range.
When using an OS capacitor, a tantalum capacitor, or an aluminum electrolytic capacitor, the capacitance must be 0.1
µF or more.
The values of output overshoot and undershoot, which are transient response characteristics, vary depending on the
value of the output capacitor.
The required value of capacitance for the input capacitor differs depending on the application.
Set the value for input capacitor (CIN) and output capacitor (CL) as follows.
CIN 0.1 µF
CL 0.1 µF
Caution Define the capacity values of CIN and CL by sufficient evaluation including the temperature
characteristics under the actual usage conditions.
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HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
Rev.1.0_03
„ Explanation of Terms
1. Low dropout voltage regulator
A voltage regulator which has a low dropout voltage due to its built-in low on-resistance transistor.
2. Output voltage (VOUT)
The accuracy of the output voltage is ensured at ±3.0% under specified conditions of fixed input voltage*1, fixed
output current, and fixed temperature.
*1. Differs depending on the product.
Caution If the above conditions change, the output voltage value may vary and exceed the accuracy range
of the output voltage. Refer to “„ Electrical Characteristics” and “„ Characteristics (Typical Data)”
for details.
3. Line regulation
VOUT1
VIN VOUT

Indicates the dependency of the output voltage against the input voltage. That is, the value shows how much the
output voltage changes due to a change in the input voltage after fixing output current constant.
4. Load regulation (VOUT2)
Indicates the dependency of the output voltage against the output current. That is, the value shows how much the
output voltage changes due to a change in the output current after fixing input voltage constant.
5. Dropout voltage (Vdrop)
Indicates the difference between the output voltage and the input voltage VIN1, which is the input voltage (VIN) when
decreasing input voltage VIN gradually until the output voltage has dropped to the value of 98% of output voltage
www.DataSheVetO4UUT.3c,owmhich is at VIN = VOUT(S) + 2.0 V.
Vdrop = VIN1 (VOUT3 × 0.98)
14 Seiko Instruments Inc.


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Rev.1.0_03
HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
„ Operation
1. Basic operation
Figure 11 shows a block diagram of the S-1142 Series.
The error amplifier compares the reference voltage (Vref) with Vfb, which is the output voltage resistance-divided by
feedback resistors Rs and Rf. It supplies a gate voltage necessary to maintain a constant output voltage which is
not influenced by the input voltage and temperature change to the output transistor.
VIN
Constant
current
supply
Vref
Error amplifier
+
Reference voltage
circuit
*1
Rf
Vfb
Rs
VOUT
VSS
*1. Parasitic diode
Figure 11
2. Output transistor
www.DataSheIent4thUe.coSm-1142 Series, a low on-resistance P-channel MOSFET is used as the output transistor.
Be sure that VOUT does not exceed VIN + 0.3 V, to prevent the voltage regulator from being damaged due to inverse
current which flows, because of a parasitic diode between the VIN and VOUT pins, when the potential of VOUT
becomes higher than VIN.
Seiko Instruments Inc.
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HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
Rev.1.0_03
3. Shutdown pin (ON/OFF pin)
This pin starts and stops the regulator.
When the ON/OFF pin is set to the shutdown level, the entire internal circuit stops operating, and the built-in
P-channel MOS FET output transistor between the VIN and VOUT pins is turned off, in order to reduce the current
consumption significantly. The VOUT pin is set to the VSS level by the internal dividing resistor of several M
between the VOUT and VSS pins.
Note that the current consumption increases when a voltage of 0.3 V to VIN 0.3 V is applied to the ON/OFF pin.
The ON/OFF pin is configured as shown in Figure 12. Since the ON/OFF pin is neither pulled down nor pulled up
internally, do not use it in the floating state. When not using the ON/OFF pin, connect it to the VSS pin in the
product A type, and connect it to the VIN pin in the B type.
Table 8
Logic Type
A
A
B
B
ON/OFF Pin
“L”: Power on
“H”: Power off
“L”: Power off
“H”: Power on
Internal Circuits
Operate
Stop
Stop
Operate
VOUT Pin Voltage
Set value
VSS level
VSS level
Set value
Current Consumption
ISS1
ISS2
ISS2
ISS1
VIN
ON/OFF
www.DataSheet4U.com
VSS
Figure 12
4. Overcurrent protector
The S-1142 Series has an overcurrent protection circuit having the characteristics shown in (1) Output Voltage vs.
Output Current (When load current is increased) (Ta = +25°C) in “„ Characteristics (Typical Data)”, in order to
protect the output transistor against an excessive output current and short circuiting between the VOUT and VSS
pin. The current (ISHORT) when the output pin is short-circuited is internally set at approx. 80 mA (typ.), and the initial
value is restored for the output voltage, if releasing a short circuit once.
Caution
Using the overcurrent protection circuit is to protect the output transistor from accidental
conditions such as short circuited load and the rapid and large current flow in the large capacitor.
The overcurrent protection circuit is not suitable for use under the short circuit status or large
current flowing (200 mA or more) that last long.
16 Seiko Instruments Inc.


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Rev.1.0_03
HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
5. Thermal shutdown circuit
The S-1142 Series has a thermal shutdown circuit to protect the device from damage due to overheat. When the
junction temperature rises to 150°C (Typ.), the thermal shutdown circuit operates to stop regulating. When the
junction temperature drops to 125°C (Typ.), the thermal shutdown circuit is released to restart regulating.
Due to self-heating of the S-1142 Series, if the thermal shutdown circuit starts operating, it stops regulating so that
the output voltage drops. When regulation stops, the S-1142 Series does not itself generate heat and the IC’s
temperature drops. When the temperature drops, the thermal shutdown circuit is released to restart regulating, thus
this IC generates heat again. Repeating this procedure makes the waveform of the output voltage into a pulse-like
form. Stop or restart of regulation continues unless decreasing either both of the input voltage and the output
voltage in order to reduce the internal current consumption, or decreasing the ambient temperature.
Table 9
Thermal Shutdown Circuit
Operate : 150°C (Typ.)*1
Release : 125°C (Typ.)*1
*1. Junction temperature
VOUT Pin Voltage
VSS level
Set value
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HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
Rev.1.0_03
„ Precautions
Wiring patterns for the VIN, VOUT and GND pins should be designed so that the impedance is low. When mounting
an output capacitor between the VOUT and VSS pins (CL) and a capacitor for stabilizing the input between the VIN
and VSS pins (CIN), the distance from the capacitors to these pins should be as short as possible.
Note that the output voltage may generally increase when a series regulator is used at low load current (0.1 mA or
less).
Note that the output voltage may generally increase due to the leakage current from a driver when a series regulator
is used at a high temperature.
Note that the output voltage may increase due to the leakage current from a driver even if the ON/OFF pin is at the
power-off level when a series regulator is used at a high temperature.
Generally series regulators may oscillate, depending on the selection of external parts. The following conditions are
recommended for this IC. However, be sure to perform sufficient evaluation under the actual usage conditions for
selection, including the temperature characteristics. Regarding the equivalent series resistance (RESR) for the output
capacitor, refer to (6) Example of Equivalent Series Resistance vs. Output Current Characteristics (Ta = +25°C)
in “„ Reference Data”.
Input capacitor (CIN) : 0.1 µF or more
Output capacitor (CL) : 0.1 µF or more
The voltage regulator may oscillate when the impedance of the power supply is high and the input capacitance of the
IC is small, or an input capacitor is not connected.
It is important to sufficiently evaluate in an actual device output voltage fluctuations caused by power supply or load
fluctuations.
A momentary overshoot may be output when the power supply suddenly increases, and the output capacitance is
small. It is therefore important to sufficiently evaluate the output voltage at power application in actual device.
The application conditions for the input voltage, output voltage, and load current should not exceed power dissipation
of the package.
Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in electrostatic
protection circuit.
In determining the output current, attention should be paid to the output current value specified in Table 6 and Table
7 in “„ Electrical Characteristics” and footnote *4 of the table.
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SII claims no responsibility for any disputes arising out of or in connection with any infringement by products
including this IC of patents owned by a third party.
18 Seiko Instruments Inc.


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Rev.1.0_03
HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
„ Characteristics (Typical Data)
1. Common to S-1142xxxI and S-1142xxxH
(1) Output Voltage vs. Output Current (when load current is increased) (Ta = +25°C)
S-1142B20
2.5
2.0
13.5 V
1.5
1.0 VIN = 3.0 V
0.5
4.0 V
0
0 100 200 300 400 500 600 700 800
IOUT [mA]
S-1142B50
6
5
4
3
2
1
0
0
VIN = 5.5 V
6.0 V
13.5 V
7.0 V
100 200 300 400 500 600 700 800
IOUT [mA]
S-1142BC0
14
12
10
8
6
4
2
0
0
13.5 V
VIN = 12.5 V
13.0 V
100 200 300 400 500 600 700 800
IOUT [mA]
Remark In determining the output current, attention should
be paid to the following.
1. The minimum value of output current value
and footnote *4 in Table 6 and 7 in the „
Electrical Characteristics”
2. Power dissipation of the package
(2) Output Voltage vs. Input Voltage (Ta = +25°C)
S-1142B20
2.2
2.1
www.DataSheet4U2.c.0om
1.9
1.8
1.7
1.6
1.5
0
IOUT = 1 mA
30 mA
50 mA
5 10 15 20 25 30
VIN [V]
S-1142BC0
12.4
12.2
12.0
11.8
11.6
11.4
11.2
11.0
10
IOUT = 1 mA
30 mA
50 mA
15 20
VIN [V]
25
30
S-1142B50
5.2
5.1
5.0
4.9
4.8
4.7
4.6
4.5
0
IOUT = 1 mA
30 mA
50 mA
5 10 15 20 25 30
VIN [V]
Seiko Instruments Inc.
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HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
Rev.1.0_03
(3) Dropout Voltage vs. Output Current
S-1142B20
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
Tj = 125°C
25°C
40°C
50 100 150 200
IOUT [mA]
S-1142BC0
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
0
Tj = 125°C
25°C
40°C
50 100 150 200
IOUT [mA]
250
250
(4) Dropout Voltage vs. Temperature
S-1142B20
0.9
0.8
0.7
0.6
0.5
0.4
www.DataSheet4U0..c3om
0.2
0.1
0
40 25
0
IOUT = 100 mA
10 mA
25 50 75 100 125
Tj [°C]
S-1142BC0
0.30
0.25
0.20
0.15
0.10
0.05
0
40 25
0
IOUT = 100 mA
10 mA
25 50 75 100 125
Tj [°C]
S-1142B50
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
Tj = 125°C
25°C
40°C
50 100 150 200 250
IOUT [mA]
S-1142B50
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
40 25
0
IOUT = 100 mA
10 mA
25 50 75 100 125
Tj [°C]
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Rev.1.0_03
HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
(5) Dropout Voltage vs. Set Output Voltage (Tj = +25°C)
1.2
1.0
IOUT = 200 mA
100 mA
0.8 30 mA
0.6
10 mA
1 mA
0.4
0.2
0
0 2 4 6 8 10 12 14
VOUT [V]
(6) Current Consumption during Operation vs. Input Voltage (When ON/OFF pin is ON, no load)
S-1142B20
16
14
12
10
8
6
4
2
0
0
Tj = 125°C
25°C
40°C
5 10 15 20 25 30
VIN [V]
S-1142B50
16
14
12
10
8
6
4
2
0
0
Tj = 125°C
25°C
40°C
5 10 15 20 25
VIN [V]
S-1142BC0
16
14
12
10
8
6
www.DataSheet4U.c4om
2
0
0
Tj = 125°C
25°C
40°C
5 10 15 20 25 30
VIN [V]
30
Seiko Instruments Inc.
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HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
Rev.1.0_03
(7) Current Consumption during Operation vs. Output Current (Ta = +25°C)
S-1142B20
160
140
120
100
80
60
40
20
0
0
VIN = 13.5 V
3.0 V
25 50 75 100 125 150
IOUT [mA]
S-1142B50
160
140
120
100
80
60
40
20
0
0
25
S-1142BC0
160
140
120
100
80
60
40
20
0
0
VIN = 20.0 V
13.0 V
25 50 75 100 125 150
IOUT [mA]
VIN = 13.5 V
6.0 V
50 75 100 125 150
IOUT [mA]
(8) Ripple Rejection (Ta = +25°C)
S-1142B20
80
70
60
50
www.DataSheet4U43.c00om
20
10
0
10
S-1142BC0
60
50
40
30
20
10
VIN = 13.5 V, CL = 0.1 µF
IOUT = 1 mA
30 mA
100 mA
100 1k 10k 100k 1M
Frequency [Hz]
VIN = 13.5 V, CL = 0.1 µF
IOUT = 1 mA
30 mA
100 mA
0
10 100 1k 10k 100k 1M
Frequency [Hz]
S-1142B50
70
60
50
40
30
20
10
0
10
VIN = 13.5 V, CL = 0.1 µF
IOUT = 1 mA
30 mA
100 mA
100 1k 10k 100k 1M
Frequency [Hz]
22 Seiko Instruments Inc.


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Rev.1.0_03
HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
2. S-1142xxxI
(1) Output Voltage vs. Temperature
S-1142B20
2.04
VIN = 3.0 V
S-1142B50
5.2
VIN = 6.0 V
2.02
2.00
1.98
1.96
40 25 0
S-1142BC0
12.4
25 50 75 100 125
Tj [°C]
VIN = 13.0 V
5.1
5.0
4.9
4.8
40 25 0
25 50 75 100 125
Tj [°C]
12.2
12.0
11.8
11.6
40 25 0
25 50 75 100 125
Tj [°C]
(2) Current Consumption during Operation vs. Temperature
S-1142B20
6.0
www.DataSheet4U5..c5om
5.0
4.5
4.0
3.5
3.0
2.5
40 25
0
S-1142BC0
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
40 25
0
VIN = 3.0 V
25 50 75 100 125
Tj [°C]
VIN = 13.0 V
25 50 75 100 125
Tj [°C]
S-1142B50
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
40 25
0
VIN = 6.0 V
25 50 75 100 125
Tj [°C]
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HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
Rev.1.0_03
(3) Output Current vs. Input Voltage*1
S-1142B33
250
200
25°C
150
100 Ta = 85°C
50
0
0 10 20 30 40 50
VIN [V]
S-1142B50
250
200
150
100
50
0
0
*1. When mounted on board
[Mounted board]
(1) Board size :
50 mm × 50 mm × t1.6 mm
(2) Board material : Glass epoxy resin (two layers)
(3) Wiring ratio : Surface approx. 75%, reverse side approx. 90%
(4) Hole :
Diameter 0.5 mm × 24 pieces
Ta = 85°C
25°C
10 20 30 40 50
VIN [V]
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Rev.1.0_03
HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
3. S-1142xxxH
(1) Output Voltage vs. Temperature
S-1142B20
2.04
VIN = 13.5 V
S-1142B50
5.2
VIN = 13.5 V
2.02
2.00
1.98
1.96
40 25 0
S-1142BC0
12.4
25 50 75 100 125
Tj [°C]
VIN = 13.5 V
5.1
5.0
4.9
4.8
40 25 0
25 50 75 100 125
Tj [°C]
12.2
12.0
11.8
11.6
40 25 0
25 50 75 100 125
Tj [°C]
(2) Current Consumption during Operation vs. Temperature
S-1142B20
6.0
www.DataSheet4U5..c5om
5.0
4.5
4.0
3.5
3.0
2.5
−40 25
0
S-1142BC0
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
40 25
0
VIN = 13.5 V
25 50 75 100 125
Tj [°C]
VIN = 13.5 V
25 50 75 100 125
Tj [°C]
S-1142B50
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
−40 25
0
VIN = 13.5 V
25 50 75 100 125
Tj [°C]
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HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
Rev.1.0_03
(3) Output Current vs. Input Voltage*1
S-1142B33
250
200
150
100 Ta = 105°C
25°C
50
0
0 5 10 15 20 25 30 35
VIN [V]
S-1142B50
250
200
150
100
50
0
0
Ta = 105°C
25°C
5 10 15 20 25 30 35
VIN [V]
*1. When mounted on board
[Mounted board]
(1) Board size :
50 mm × 50 mm × t1.6 mm
(2) Board material : Glass epoxy resin (two layers)
(3) Wiring ratio : Surface approx. 75%, reverse side approx. 90%
(4) Hole :
Diameter 0.5 mm × 24 pieces
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Rev.1.0_03
HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
„ Reference Data
(1) Characteristics of Input Transient Response (Ta = +25°C)
S-1142B20
IOUT = 30 mA, tr = tf = 5.0 µs, CIN = 0.1 µF
2.5
14
2.4 VIN
2.3
2.2 VOUT
2.1
CL = 10 µF
22 µF
13
12
11
10
2.0 9
1.9 8
200 0 200 400 600 800 1000 1200
t [µs]
S-1142B50
IOUT = 30 mA, tr = tf = 5.0 µs, CIN =0.1 µF
6.0
14
5.8 VIN
5.6
13
12
5.4 VOUT
5.2
CL = 10 µF
22 µF
11
10
5.0 9
4.8 8
200 0 200 400 600 800 1000 1200
t [µs]
S-1142BC0
IOUT = 30 mA, tr = tf = 5.0 µs, CIN = 0.1 µF
13.2
16
13.0 VIN
12.8
15
14
12.6
12.4
12.2
VOUT
CL = 10 µF
22 µF
13
12
11
12.0 10
11.8 9
200 0 200 400 600 800 1000 1200
t [µs]
(2) Characteristics of Load Transient Response (Ta = +25°C)
S-1142B20
VIN = 13.5 V, CIN = 0.1 µF, IOUT = 50 mA 100 mA
2.4 150
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2.3 IOUT
2.2
100
50
2.1
2.0 VOUT
CL = 10 µF
0
50
1.9 22 µF
100
1.8 150
200 0 200 400 600 800 1000 1200
t [µs]
S-1142BC0
VIN = 13.5 V, CIN = 0.1 µF, IOUT = 50 mA 100 mA
14.0 150
13.5 IOUT
13.0
100
50
12.5
12.0 VOUT
CL = 22 µF
0
50
11.5 10 µF
100
11.0 150
200 0 200 400 600 800 1000 1200
t [µs]
S-1142B50
VIN = 13.5 V, CIN = 0.1 µF, IOUT = 50 mA 100 mA
5.8 150
5.6 IOUT
5.4
100
50
5.2
5.0 VOUT
CL = 10 µF
0
50
4.8 22 µF
100
4.6 150
200 0 200 400 600 800 1000 1200
t [µs]
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HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
Rev.1.0_03
(3) Transient Response Characteristics of ON/OFF Pin (Ta = +25°C)
S-1142B33
VIN = 13.5 V, CL = 10 µF, CIN = 0.1 µF, IOUT = 100 mA
15 18
12 12
9 VON/OFF
6
60
3
0 VOUT
6
12
3
500
18
0 500 1000 1500 2000
t [µs]
S-1142B50
VIN = 13.5 V, CL = 10 µF, CIN = 0.1 µF, IOUT = 100 mA
15 18
12 12
9 VON/OFF
6
60
3
0 VOUT
6
12
3
500
18
0 500 1000 1500 2000
t [µs]
(4) Load Transient Response Characteristics Dependent on Capacitance (Ta = +25°C)
S-1142B50
VIN = 13.5 V, CIN = 0.1 µF, IOUT = 50 mA 100 mA
0.5
0.4
0.3
0.2
0.1
0
0 20 40 60 80 100
CL [µF]
VIN = 13.5 V, CIN = 0.1 µF, IOUT = 100 mA 50 mA
0.5
0.4
0.3
0.2
0.1
0
0 20 40 60 80 100
CL [µF]
(5) Input Transient Response Characteristics Dependent on Capacitance (Ta = +25°C)
S-1142B50
www.DaVtaINS=he7etV4U.co1m2 V, tr = 5.0 µs, CIN = 0.1 µF, IOUT = 30 mA
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0 20 40 60 80 100
CL [µF]
VIN = 12 V 7 V, tr = 5.0 µs, CIN = 0.1 µF, IOUT = 30 mA
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0 20 40 60 80 100
CL [µF]
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Rev.1.0_03
HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
(6) Example of Equivalent Series Resistance vs. Output Current Characteristics (Ta = +25°C)
CL : TDK Corporation C3216X8R2A104K (0.1 µF)
CIN = CL = 0.1 µF
100 VIN
0
0.1
Stable
IOUT [mA]
200
CIN
S-1142 Series
ON/OFF
VSS
VOUT
CL
RESR
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HIGH-WITHSTAND VOLTAGE LOW CURRENT CONSUMPTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1142 Series
„ Marking Specifications
HSOP-6
Top view
65 4
(1) (2) (3) (4) (5) (6)
(7) (8) (9) (10) (11) (12)
(13) (14) (15) (16)
(1) to (5) :
(6) :
(7) and (8) :
(9) :
(10) to (16) :
Product name : S1142 (Fixed)
Product type
Value of output voltage
Operating temperature
Lot number
Rev.1.0_03
12 3
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30 Seiko Instruments Inc.



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