S-1122 Datasheet PDF
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S-1112/1122 Series
www.sii-ic.com
© Seiko Instruments Inc., 2002-2015
HIGH RIPPLE-REJECTION AND LOW DROPOUT
CMOS VOLTAGE REGULATOR
Rev.6.1_00
The S-1112/1122 Series is a positive voltage regulator with a low dropout voltage, high-accuracy output
voltage, and low current consumption developed based on CMOS technology.
A built-in low on-resistance transistor provides a low dropout voltage and large output current, and a built-in
overcurrent protection circuit prevents the load current from exceeding the current capacity of the output
transistor. An ON/OFF circuit ensures a long battery life. Compared with the voltage regulators using the
conventional CMOS technology, a larger variety of capacitors are available, including small ceramic capacitors.
Small SNT-6A(H) (S-1112 Series only) and SOT-23-5 packages realize high-density mounting. In SOT-23-5,
the lineup includes the S-1112 and S-1122 Series, which differ in pin configuration.
Features
Output voltage:
Output voltage accuracy:
Dropout voltage:
Current consumption:
Output current:
Output capacitor:
Ripple rejection:
Built-in overcurrent protection circuit:
Built-in ON/OFF circuit:
Operation temperature range:
Lead-free, Sn 100%, halogen-free*2
1.5 V to 5.5 V, selectable in 0.1 V step
±1.0%
190 mV typ. (3.0 V output product, IOUT = 100 mA)
During operation: 50 μA typ., 90 μA max.
During power-off: 0.1 μA typ., 1.0 μA max.
Possible to output 150 mA (VIN VOUT(S) + 1.0 V)*1
A ceramic capacitor of 0.47 μF or more can be used.
80 dB typ. (f = 1.0 kHz)
Limits overcurrent of output transistor.
Ensures long battery life.
Ta = 40°C to +85°C
*1. Attention should be paid to the power dissipation of the package when the output current is large.
*2. Refer to “Product Name Structure” for details.
Applications
Constant-voltage power supply for battery-powered device
Constant-voltage power supply for personal communication device
Constant-voltage power supply for home electric/electronic appliance
Constant-voltage power supply for cellular phone
Packages
SNT-6A(H)
SOT-23-5
Seiko Instruments Inc.
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HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1112/1122 Series
Rev.6.1_00
Block Diagram
VIN
*1
VOUT
Overcurrent
protection circuit
ON/OFF
ON/OFF
circuit
+
Reference
voltage circuit
VSS
*1. Parasitic diode
Figure 1
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HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.6.1_00
S-1112/1122 Series
Product Name Structure
Users can select the product type, output voltage, and package type for the S-1112/1122 Series. Refer to
1. Product name” regarding the contents of product name, “2. Packages” regarding the package
drawings, “3. Product name lists” regarding details of product name.
1. Product name
(1) SNT-6A(H) for S-1112 Series
S-1112 x xx PI - xxx TF U
Environmental code
U: Lead-free (Sn 100%), halogen-free
IC direction in tape specifications*1
Product name (abbreviation)*2
Package name (abbreviation)
PI : SNT-6A(H)
Output voltage
15 to 55
(E.g., when the output voltage is 1.5 V,
it is expressed as 15.)
Product type*3
A: ON/OFF pin negative logic
B: ON/OFF pin positive logic
(2) SOT-23-5 for S-1112 Series
S-1112 x xx MC - xxx TF x
Environmental code
U: Lead-free (Sn 100%), halogen-free
G: Lead-free (for details, please contact our sales office)
IC direction in tape specifications*1
Product name (abbreviation)*2
Package name (abbreviation)
MC: SOT-23-5
Output voltage
15 to 55
(E.g., when the output voltage is 1.5 V,
it is expressed as 15.)
Product type*3
A: ON/OFF pin negative logic
B: ON/OFF pin positive logic
*1. Refer to the tape drawing.
*2. Refer to the product name lists.
*3. Refer to “3. ON/OFF pin” in “Operation”.
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HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1112/1122 Series
Rev.6.1_00
(3) S-1122 Series
S-1122 x xx MC - xxx TF x
Environmental code
U: Lead-free (Sn 100%), halogen-free
G: Lead-free (for details, please contact our sales office)
IC direction in tape specifications*1
Product name (abbreviation)*2
Package name (abbreviation)
MC: SOT-23-5
Output voltage
15 to 55
(E.g., when the output voltage is 1.5 V,
it is expressed as 15.)
Product type*3
A: ON/OFF pin negative logic
B: ON/OFF pin positive logic
*1. Refer to the tape drawing.
*2. Refer to the product name lists.
*3. Refer to “3. ON/OFF pin” in “Operation”.
2. Packages
Package name
SNT-6A(H)
SOT-23-5
Package
PI006-A-P-SD
MP005-A-P-SD
Drawing code
Tape
Reel
PI006-A-C-SD
PI006-A-R-SD
MP005-A-C-SD MP005-A-R-SD
Land
PI006-A-L-SD
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HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.6.1_00
S-1112/1122 Series
3. Product name lists
(1) S-1112 Series
Table 1
Output Voltage
SNT-6A(H)
SOT-23-5
1.5 V ±1.0%
S-1112B15PI-L6ATFU S-1112B15MC-L6ATFx
1.6 V ±1.0%
S-1112B16PI-L6BTFU S-1112B16MC-L6BTFx
1.7 V ±1.0%
S-1112B17PI-L6CTFU S-1112B17MC-L6CTFx
1.8 V ±1.0%
S-1112B18PI-L6DTFU S-1112B18MC-L6DTFx
1.9 V ±1.0%
S-1112B19PI-L6ETFU S-1112B19MC-L6ETFx
2.0 V ±1.0%
S-1112B20PI-L6FTFU S-1112B20MC-L6FTFx
2.1 V ±1.0%
S-1112B21PI-L6GTFU S-1112B21MC-L6GTFx
2.2 V ±1.0%
S-1112B22PI-L6HTFU S-1112B22MC-L6HTFx
2.3 V ±1.0%
S-1112B23PI-L6ITFU
S-1112B23MC-L6ITFx
2.4 V ±1.0%
S-1112B24PI-L6JTFU S-1112B24MC-L6JTFx
2.5 V ±1.0%
S-1112B25PI-L6KTFU S-1112B25MC-L6KTFx
2.6 V ±1.0%
S-1112B26PI-L6LTFU S-1112B26MC-L6LTFx
2.7 V ±1.0%
S-1112B27PI-L6MTFU S-1112B27MC-L6MTFx
2.8 V ±1.0%
S-1112B28PI-L6NTFU S-1112B28MC-L6NTFx
2.85 V ±1.0%
S-1112B2JPI-L7PTFU S-1112B2JMC-L7PTFx
2.9 V ±1.0%
S-1112B29PI-L6OTFU S-1112B29MC-L6OTFx
3.0 V ±1.0%
S-1112B30PI-L6PTFU S-1112B30MC-L6PTFx
3.1 V ±1.0%
S-1112B31PI-L6QTFU S-1112B31MC-L6QTFx
3.2 V ±1.0%
S-1112B32PI-L6RTFU S-1112B32MC-L6RTFx
3.3 V ±1.0%
S-1112B33PI-L6STFU S-1112B33MC-L6STFx
3.4 V ±1.0%
S-1112B34PI-L6TTFU S-1112B34MC-L6TTFx
3.5 V ±1.0%
S-1112B35PI-L6UTFU S-1112B35MC-L6UTFx
3.6 V ±1.0%
S-1112B36PI-L6VTFU S-1112B36MC-L6VTFx
3.7 V ±1.0%
S-1112B37PI-L6WTFU S-1112B37MC-L6WTFx
3.8 V ±1.0%
S-1112B38PI-L6XTFU S-1112B38MC-L6XTFx
3.9 V ±1.0%
S-1112B39PI-L6YTFU S-1112B39MC-L6YTFx
4.0 V ±1.0%
S-1112B40PI-L6ZTFU S-1112B40MC-L6ZTFx
4.1 V ±1.0%
S-1112B41PI-L7ATFU S-1112B41MC-L7ATFx
4.2 V ±1.0%
S-1112B42PI-L7BTFU S-1112B42MC-L7BTFx
4.3 V ±1.0%
S-1112B43PI-L7CTFU S-1112B43MC-L7CTFx
4.4 V ±1.0%
S-1112B44PI-L7DTFU S-1112B44MC-L7DTFx
4.5 V ±1.0%
S-1112B45PI-L7ETFU S-1112B45MC-L7ETFx
4.6 V ±1.0%
S-1112B46PI-L7FTFU S-1112B46MC-L7FTFx
4.7 V ±1.0%
S-1112B47PI-L7GTFU S-1112B47MC-L7GTFx
4.8 V ±1.0%
S-1112B48PI-L7HTFU S-1112B48MC-L7HTFx
4.9 V ±1.0%
S-1112B49PI-L7ITFU
S-1112B49MC-L7ITFx
5.0 V ±1.0%
S-1112B50PI-L7JTFU S-1112B50MC-L7JTFx
5.1 V ±1.0%
S-1112B51PI-L7KTFU S-1112B51MC-L7KTFx
5.2 V ±1.0%
S-1112B52PI-L7LTFU S-1112B52MC-L7LTFx
5.3 V ±1.0%
S-1112B53PI-L7MTFU S-1112B53MC-L7MTFx
5.4 V ±1.0%
S-1112B54PI-L7NTFU S-1112B54MC-L7NTFx
5.5 V ±1.0%
S-1112B55PI-L7OTFU S-1112B55MC-L7OTFx
Remark 1. Please contact our sales office for type A products.
2. x: G or U
3. Please select products of environmental code = U for Sn 100%, halogen-free products.
Seiko Instruments Inc.
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HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1112/1122 Series
Rev.6.1_00
(2) S-1122 Series
Table 2
Output Voltage
SOT-23-5
1.5 V ±1.0%
S-1122B15MC-L8ATFx
1.6 V ±1.0%
S-1122B16MC-L8BTFx
1.7 V ±1.0%
S-1122B17MC-L8CTFx
1.8 V ±1.0%
S-1122B18MC-L8DTFx
1.9 V ±1.0%
S-1122B19MC-L8ETFx
2.0 V ±1.0%
S-1122B20MC-L8FTFx
2.1 V ±1.0%
S-1122B21MC-L8GTFx
2.2 V ±1.0%
S-1122B22MC-L8HTFx
2.3 V ±1.0%
S-1122B23MC-L8ITFx
2.4 V ±1.0%
S-1122B24MC-L8JTFx
2.5 V ±1.0%
S-1122B25MC-L8KTFx
2.6 V ±1.0%
S-1122B26MC-L8LTFx
2.7 V ±1.0%
S-1122B27MC-L8MTFx
2.8 V ±1.0%
S-1122B28MC-L8NTFx
2.9 V ±1.0%
S-1122B29MC-L8OTFx
3.0 V ±1.0%
S-1122B30MC-L8PTFx
3.1 V ±1.0%
S-1122B31MC-L8QTFx
3.2 V ±1.0%
S-1122B32MC-L8RTFx
3.3 V ±1.0%
S-1122B33MC-L8STFx
3.4 V ±1.0%
S-1122B34MC-L8TTFx
3.5 V ±1.0%
S-1122B35MC-L8UTFx
3.6 V ±1.0%
S-1122B36MC-L8VTFx
3.7 V ±1.0%
S-1122B37MC-L8WTFx
3.8 V ±1.0%
S-1122B38MC-L8XTFx
3.9 V ±1.0%
S-1122B39MC-L8YTFx
4.0 V ±1.0%
S-1122B40MC-L8ZTFx
4.1 V ±1.0%
S-1122B41MC-L9ATFx
4.2 V ±1.0%
S-1122B42MC-L9BTFx
4.3 V ±1.0%
S-1122B43MC-L9CTFx
4.4 V ±1.0%
S-1122B44MC-L9DTFx
4.5 V ±1.0%
S-1122B45MC-L9ETFx
4.6 V ±1.0%
S-1122B46MC-L9FTFx
4.7 V ±1.0%
S-1122B47MC-L9GTFx
4.8 V ±1.0%
S-1122B48MC-L9HTFx
4.9 V ±1.0%
S-1122B49MC-L9ITFx
5.0 V ±1.0%
S-1122B50MC-L9JTFx
5.1 V ±1.0%
S-1122B51MC-L9KTFx
5.2 V ±1.0%
S-1122B52MC-L9LTFx
5.3 V ±1.0%
S-1122B53MC-L9MTFx
5.4 V ±1.0%
S-1122B54MC-L9NTFx
5.5 V ±1.0%
S-1122B55MC-L9OTFx
Remark 1. Please contact our sales office for type A products.
2. x: G or U
3. Please select products of environmental code = U for Sn 100%, halogen-free products.
6 Seiko Instruments Inc.


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HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.6.1_00
S-1112/1122 Series
Pin Configurations
SNT-6A(H)
Top view
16
25
34
Figure 2
Table 3
(S-1112 Series)
Pin No.
Symbol
Description
1 NC *1 No connection
2 VSS GND pin
3 ON/OFF ON/OFF pin
4 VIN Input voltage pin
5 VSS GND pin
6 VOUT Output voltage pin
*1. The NC pin is electrically open.
The NC pin can be connected to VIN pin or VSS pin.
SOT-23-5
Top view
54
123
Figure 3
Table 4
(S-1112 Series)
Pin No.
Symbol
Description
1 VIN Input voltage pin
2 VSS GND pin
3 ON/OFF ON/OFF pin
4
NC*1
No connection
5 VOUT Output voltage pin
*1. The NC pin is electrically open.
The NC pin can be connected to VIN pin or VSS pin.
Table 5
(S-1122 Series)
Pin No.
Symbol
Description
1 VOUT Output voltage pin
2 VSS GND pin
3 VIN Input voltage pin
4 ON/OFF ON/OFF pin
5
NC*1
No connection
*1. The NC pin is electrically open.
The NC pin can be connected to VIN pin or VSS pin.
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HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1112/1122 Series
Rev.6.1_00
Absolute Maximum Ratings
Table 6
Item
Input voltage
Output voltage
Power dissipation
SNT-6A(H)
SOT-23-5
Symbol
VIN
VON/OFF
VOUT
PD
Operation ambient temperature
Topr
Storage temperature
Tstg
*1. When mounted on board
[Mounted board]
(1) Board size : 114.3 mm × 76.2 mm × t1.6 mm
(2) Board name : JEDEC STANDARD51-7
(Ta = 25°C unless otherwise specified)
Absolute Maximum Rating
Unit
VSS 0.3 to VSS + 7
VSS 0.3 to VIN + 0.3
VSS 0.3 to VIN + 0.3
500*1
V
V
V
mW
300 (When not mounted on board)
600*1
mW
mW
40 to +85
°C
40 to +125
°C
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.
700
600
500 SOT-23-5
400
300
200 SNT-6A(H)
100
Figure 4
0
0
50 100 150
Ambient temperature (Ta) [°C]
Power Dissipation of The Package (When Mounted on Board)
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HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.6.1_00
S-1112/1122 Series
Electrical Characteristics
Table 7
(Ta = 25°C unless otherwise specified)
Item Symbol
Conditions
Min.
Typ.
Max.
Unit
Test
Circuit
Output voltage*1
Output current*2
Dropout voltage*3
Line regulation
Load regulation
Output voltage
temperature coefficient*4
VOUT(E) VIN = VOUT(S) + 1.0 V, IOUT = 30 mA
IOUT
VIN VOUT(S) + 1.0 V
1.5 V VOUT(S) 1.6 V
1.7 V VOUT(S) 1.8 V
Vdrop
IOUT = 100 mA
1.9 V VOUT(S) 2.3 V
2.4 V VOUT(S) 2.7 V
ΔVOUT1
2.8 V VOUT(S) 5.5 V
VOUT(S) + 0.5 V VIN 6.5 V,
ΔVINVOUT IOUT = 30 mA
ΔVOUT2
VIN = VOUT(S) + 1.0 V,
1.0 mA IOUT 80 mA
ΔVOUT VIN = VOUT(S) + 1.0 V, IOUT = 10 mA,
ΔTaVOUT 40°C Ta 85°C
VOUT(S)
× 0.99
150*5
VOUT(S)
0.32
0.28
0.25
0.20
0.19
VOUT(S)
× 1.01
0.55
0.47
0.35
0.29
0.26
V
mA
V
V
V
V
V
0.05 0.2 %/V
1
3
1
1
1
1
1
1
12 40 mV 1
±100
ppm/°
C
1
Current consumption
during operation
ISS1
VIN = VOUT(S) + 1.0 V, ON/OFF pin = ON,
no load
50 90 μA 2
Current consumption
during power-off
ISS2
VIN = VOUT(S) + 1.0 V, ON/OFF pin = OFF,
no load
0.1 1.0 μA 2
Input voltage
ON/OFF pin
input voltage “H”
VIN
VSH VIN = VOUT(S) + 1.0 V, RL = 1.0 kΩ
2.0 6.5 V
1.5
V4
ON/OFF pin
input voltage “L”
VSL VIN = VOUT(S) + 1.0 V, RL = 1.0 kΩ
0.3 V
4
ON/OFF pin
input current “H”
ISH VIN = 6.5 V, VON/OFF = 6.5 V
0.1
0.1 μA 4
ON/OFF pin
input current “L”
ISL VIN = 6.5 V, VON/OFF = 0 V
0.1
0.1 μA 4
Ripple rejection
RR VIN = VOUT(S) + 1.0 V, f = 1.0 kHz,
ΔVrip = 0.5 Vrms, IOUT = 30 mA
80 dB 5
Short-circuit current
Ishort
VIN = VOUT(S) + 1.0 V, ON/OFF pin = ON,
VOUT = 0 V
200 mA 3
*1. VOUT(S): Set output voltage
VOUT(E): Actual output voltage
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) + 1.0 V and IOUT = 100 mA.
VIN1 is the input voltage at which the output voltage becomes 98% of VOUT3 after gradually decreasing the input voltage.
*4. A change in the temperature of the output voltage [mV/°C] is calculated using the following equation.
ΔVOUT
ΔTa
[mV/°C]*1 = VOUT(S) [V]*2 ×
ΔVOUT
ΔTa VOUT
[ppm/°C]*3 ÷ 1000
*1. Change in temperature of output voltage
*2. Set output voltage
*3. Output voltage temperature coefficient
*5. The output current can be at least this value.
Due to restrictions on 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 RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1112/1122 Series
Rev.6.1_00
Test Circuits
1.
VIN VOUT
ON/OFF VSS
Set to ON
+A
+
V
Figure 5
2.
+ A VIN
VOUT
ON/OFF
VSS
Set to
VIN or GND
Figure 6
3.
VIN VOUT
+
A
ON/OFF VSS
Set to ON
+
V
Figure 7
4.
VIN VOUT
+
A ON/OFF
VSS
+
V RL
Figure 8
5.
VIN VOUT
ON/OFF VSS
Set to ON
+
V RL
Figure 9
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HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.6.1_00
S-1112/1122 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. A ceramic capacitor of 0.47 μF or more can be used for CL.
Figure 10
Caution The above connection diagram and constant will not guarantee successful operation.
Perform thorough evaluation using the actual application to set the constant.
Condition of Application
Input capacitor (CIN):
Output capacitor (CL):
ESR of output capacitor:
1.0 μF or more
0.47 μF or more
10 Ω or less
Caution Generally a series regulator may cause oscillation, depending on the selection of external
parts. Check that no oscillation occurs with the application using the above capacitor.
Seiko Instruments Inc.
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HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1112/1122 Series
Rev.6.1_00
Explanation of Terms
1. Low dropout voltage regulator
This voltage regulator has the low dropout voltage due to its built-in low on-resistance transistor.
2. Low ESR
A capacitor whose ESR (Equivalent Series Resistance) is low. The S-1112/1122 Series enables use of a
low ESR capacitor, such as a ceramic capacitor, for the output-side capacitor (CL). A capacitor whose
ESR is 10 Ω or less can be used.
3. Output voltage (VOUT)
The accuracy of the output voltage is ensured at ±1.0% under the specified conditions of fixed input
voltage*1, fixed output current, and fixed temperature.
*1. Differs depending 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.
4. Line regulation
ΔVOUT1
ΔVIN VOUT
Indicates the dependency of the output voltage on the input voltage. That is, the values show how
much the output voltage changes due to a change in the input voltage with the output current remaining
unchanged.
5. Load regulation (ΔVOUT2)
Indicates the dependency of the output voltage on the output current. That is, the values show how
much the output voltage changes due to a change in the output current with the input voltage remaining
unchanged.
6. Dropout voltage (Vdrop)
Indicates the difference between input voltage (VIN1) and the output voltage when; decreasing input
voltage (VIN) gradually until the output voltage has dropped out to the value of 98% of output voltage
(VOUT3), which is at VIN = VOUT(S) + 1.0 V.
Vdrop = VIN1 (VOUT3 × 0.98)
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HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.6.1_00
S-1112/1122 Series
7. Output voltage temperature coefficient
ΔVOUT
ΔTa VOUT
The shaded area in Figure 11 is the range where VOUT varies in the operation temperature range when the
output voltage temperature coefficient is ±100 ppm/°C.
VOUT
[V]
Example of S-1112/1122B28 typ. product
+0.28 mV/°C
VOUT(E)*1
0.28 mV/°C
40 +25 +85 Ta [°C]
*1. VOUT(E) is the value of the output voltage measured at Ta = +25°C.
Figure 11
A change in the temperature of the output voltage [mV/°C] is calculated using the following equation.
ΔVOUT
ΔTa
[mV/°C]*1 = VOUT(S) [V]*2 ×
ΔVOUT
ΔTa VOUT
[ppm/°C]*3 ÷ 1000
*1. Change in temperature of output voltage
*2. Set output voltage
*3. Output voltage temperature coefficient
Seiko Instruments Inc.
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HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1112/1122 Series
Rev.6.1_00
Operation
1. Basic operation
Figure 12 shows the block diagram of the S-1112/1122 Series.
The error amplifier compares the reference voltage (Vref) with feedback voltage (Vfb), which is the output
voltage resistance-divided by feedback resistors (Rs and Rf). It supplies the gate voltage necessary to
maintain the constant output voltage which is not influenced by the input voltage and temperature
change, to the output transistor.
VIN
Current
supply
Vref
Error
amplifier
+
Reference voltage
circuit
*1
Rf
Vfb
Rs
VOUT
VSS
*1. Parasitic diode
Figure 12
2. Output transistor
In the S-1112/1122 Series, a low on-resistance P-channel MOS FET 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 reverse current flowing from the VOUT pin through a parasitic diode to the VIN pin, when the potential
of VOUT became higher than VIN.
14 Seiko Instruments Inc.


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HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.6.1_00
S-1112/1122 Series
3. ON/OFF pin
This pin starts and stops the regulator.
When the ON/OFF pin is set to OFF level, the entire internal circuit stops operating, and the built-in
P-channel MOS FET output transistor between the VIN pin and the VOUT pin is turned off, reducing
current consumption significantly. The VOUT pin becomes the VSS level due to the internally divided
resistance of several MΩ between the VOUT pin and the VSS pin.
The structure of the ON/OFF pin is as shown in Figure 13. Since the ON/OFF pin is neither pulled down
nor pulled up internally, do not use it in the floating status. In addition, note that the current consumption
increases if a voltage of 0.3 V to VIN – 0.3 V is applied to the ON/OFF pin. 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 B type.
Table 8
Product Type
A
A
B
B
ON/OFF Pin
“L”: ON
“H”: OFF
“L”: OFF
“H”: ON
Internal Circuit
Operate
Stop
Stop
Operate
VOUT Pin Voltage
Set value
VSS level
VSS level
Set value
Current Consumption
ISS1
ISS2
ISS2
ISS1
VIN
ON/OFF
VSS
Figure 13
Selection of Output Capacitor (CL)
The S-1112/1122 Series requires an output capacitor between the VOUT pin and the VSS pin for phase
compensation. A ceramic capacitor with a capacitance of 0.47 μF or more can be used. When using an OS
capacitor, a tantalum capacitor, or an aluminum electrolytic capacitor, the capacitance must be 0.47 μF or
more, and the ESR must be 10 Ω or less.
The value of the output overshoot or undershoot transient response varies depending on the value of the
output capacitor.
When selecting the output capacitor, perform sufficient evaluation, including evaluation of temperature
characteristics, on the actual device.
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HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1112/1122 Series
Rev.6.1_00
Precautions
Wiring patterns for the VIN pin, the VOUT pin and GND should be designed so that the impedance is
low. When mounting an output capacitor between the VOUT pin and the VSS pin (CL) and a capacitor
for stabilizing the input between the VIN pin and the VSS pin (CIN), the distance from the capacitors to
these pins should be as short as possible.
Note that generally the output voltage may increase when a series regulator is used at low load current
(1.0 mA or less).
Generally a series regulator may cause oscillation, depending on the selection of external parts. The
following conditions are recommended for the S-1112/1122 Series. However, be sure to perform
sufficient evaluation under the actual usage conditions for selection, including evaluation of temperature
characteristics.
Input capacitor (CIN):
1.0 μF or more
Output capacitor (CL):
0.47 μF or more
Equivalent series resistance (ESR): 10 Ω or less
The voltage regulator may oscillate when the impedance of the power supply is high and the input
capacitance is small or an input capacitor is not connected.
Overshoot may occur in the output voltage momentarily if the voltage is rapidly raised at power-on or
when the power supply fluctuates. Sufficiently evaluate the output voltage at power-on with the actual
device.
The application conditions for the input voltage, the output voltage, and the load current should not
exceed the package power dissipation.
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
7 in “Electrical Characteristics” and footnote *5 of the table.
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.
16 Seiko Instruments Inc.


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HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.6.1_00
S-1112/1122 Series
Characteristics (Typical Data)
Remark The following, which describes the S-1112 Series as the typical product, shows typical data common
to the S-1122 Series.
(1) Output Voltage vs. Output current (when load current increases)
S-1112B15 (Ta = 25°C)
S-1112B30 (Ta = 25°C)
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
VIN = 1.8 V
100 200
6.5 V
300 400
2.5 V
500 600
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
VIN = 3.3 V
100 200
6.5 V
300 400
4.0 V
500 600
IOUT [mA]
S-1112B50 (Ta = 25°C)
6
5
4 VIN = 5.3 V
3
6.0 V
2
1 6.5 V
0
0 100 200 300 400 500 600
IOUT [mA]
(2) Output voltage vs. Input voltage
S-1112B15 (Ta = 25°C)
IOUT [mA]
Remark In determining the output current, attention
should be paid to the following.
1) The minimum output current value and
footnote *5 of Table 7 in the “Electrical
Characteristics
2) The package power dissipation
S-1112B30 (Ta = 25°C)
1.6
1.5
1.4
1.3 IOUT = 1 mA
1.2 30 mA
50 mA
1.1
1.0
1.0
1.5 2.0
2.5 3.0 3.5
VIN [V]
S-1112B50 (Ta = 25°C)
3.1
3.0
2.9
2.8 IOUT = 1 mA
2.7 30 mA
50 mA
2.6
2.5
2.5
3.0 3.5
4.0 4.5 5.0
VIN [V]
5.5
5.0
4.5
4.0 IOUT = 1 mA
3.5 50 mA
3.0 30 mA
2.5
2.0
3.0 4.0
5.0 6.0 7.0
VIN [V]
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HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1112/1122 Series
Rev.6.1_00
(3) Dropout voltage vs. Output current
S-1112B15
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
0
85°C
25°C
–40°C
50 100 150 200
IOUT [mA]
S-1112B50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
0
85°C
25°C
–40°C
50 100
IOUT [mA]
150
200
(4) Dropout voltage vs. Set output voltage
S-1112B30
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
00
85°C
25°C
–40°C
50 100
IOUT [mA]
150
200
0.40
0.35
0.30 150 mA
0.25
0.20 100 mA
0.15
0.10
0.05
0
50 mA
30 mA
10 mA
0 1 2 34 567
VOUT(S) [V]
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HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.6.1_00
S-1112/1122 Series
(5) Output voltage vs. Ambient temperature
S-1112B15
1.60
1.55
1.50
1.45
1.40
–50 –25
0 25 50
Ta [°C]
75 100
S-1112B50
5.3
5.2
5.1
5.0
4.9
4.8
4.7
–50
–25
0
25 50 75 100
S-1112B30
3.20
3.15
3.10
3.05
3.00
2.95
2.90
2.85
2.80
–50
–25
0 25 50
Ta [°C]
75 100
Ta [°C]
(6) Current consumption vs. Input voltage
S-1112B15
120
100
80
60 85°C
40
20
0
0
25°C
–40°C
24
VIN [V]
6
8
S-1112B50
120
100 25°C
80
60 –40°C
40
20
0
02
85°C
4
VIN [V]
6
8
S-1112B30
120
100 25°C
80
60 –40°C
40
20
0
02
85°C
4
VIN [V]
6
8
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HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1112/1122 Series
Rev.6.1_00
(7) Ripple rejection
S-1112B15 (Ta = 25°C)
VIN = 2.5 V, COUT = 0.47 μF
100
50 mA
80
60 30 mA
40
20
0
10 100 1k
IOUT = 1 mA
10k 100k 1M
Frequency [Hz]
S-1112B50 (Ta = 25°C)
VIN = 6.0 V, COUT = 0.47 μF
100
80
50 mA
60
40
20
0
10 100
30 mA
IOUT = 1 mA
1k 10k 100k 1M
Frequency [Hz]
S-1112B30 (Ta = 25°C)
VIN = 4.0 V, COUT = 0.47 μF
100
80
60
40
20
0
10
50 mA
30 mA
IOUT = 1 mA
100 1k 10k
Frequency [Hz]
100k
1M
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HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.6.1_00
S-1112/1122 Series
Reference Data
(1) Input transient response characteristics
S-1112B15 (Ta = 25°C)
IOUT = 30 mA, tr = tf = 5.0 μs, COUT = 0.47 μF, CIN = 0 μF
1.62
1.60
1.58
1.56
VIN
1.54
1.52
1.50
VOUT
1.48
1.46
-40 -20 0
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
20 40 60 80 100 120 140 160
t [μs]
S-1112B50 (Ta = 25°C)
IOUT = 30 mA, tr = tf = 5.0 μs, COUT = 0.47 μF, CIN = 0 μF
5.12
5.10
5.08
VIN
5.06
5.04
5.02
5.00
VOUT
4.98
4.96
-40 -20 0
8
7
6
5
4
3
2
1
0
20 40 60 80 100 120 140 160
t [μs]
(2) Load transient response characteristics
S-1112B15 (Ta = 25°C)
VIN = 2.5 V, COUT = 0.47 μF, CIN = 1.0 μF, IOUT = 50 mA 100 mA
1.70
1.65
1.60 IOUT
1.55
1.50 VOUT
1.45
1.40
-40 -20 0
150
100
50
0
–50
–100
–150
20 40 60 80 100 120 140 160
t [μs]
S-1112B50 (Ta = 25°C)
VIN = 6.0 V, COUT = 0.47 μF, CIN = 1.0 μF, IOUT = 50 mA 100 mA
5.20
5.15
5.10 IOUT
5.05
VOUT
5.00
4.95
4.90
-40 -20 0
150
100
50
0
–50
–100
–150
20 40 60 80 100 120 140 160
t [μs]
S-1112B30 (Ta = 25°C)
IOUT = 30 mA, tr = tf = 5.0 μs, COUT = 0.47 μF, CIN = 0 μF
3.08
6
3.06 VIN
3.04
5
4
3.02
VOUT
3.00
3
2
2.98
1
2.96
0
-40 -20 0 20 40 60 80 100 120 140 160
t [μs]
S-1112B30 (Ta = 25°C)
VIN = 4.0 V, COUT = 0.47 μF, CIN = 1.0 μF, IOUT = 50 mA 100 mA
3.20
3.15 IOUT
3.10
3.05 VOUT
3.00
2.95
2.90-40 -20 0
150
100
50
0
–50
–100
–150
20 40 60 80 100 120 140 160
t [μs]
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HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1112/1122 Series
Rev.6.1_00
(3) ON/OFF pin transient response characteristics
S-1112B15 (Ta = 25°C)
VIN = 2.5 V, COUT = 0.47 μF, CIN = 1.0 μF, IOUT = 100 mA
53
4
3 VON/OFF
2
1
20
1 VOUT
0
–1
–2
–1 –3
-0.4 -0.2 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
t [ms]
S-1112B30 (Ta = 25°C)
VIN = 4.0 V, COUT = 0.47 μF, CIN = 1.0 μF, IOUT = 100 mA
10
8
6
4
2
0 VOUT
–2
-0.4 -0.2 0
6
VON/OFF
4
2
0
–2
–4
–6
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
t [ms]
22 Seiko Instruments Inc.


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1.57±0.03
6 54
12
0.5
3
+0.05
0.08 -0.02
0.48±0.02
0.2±0.05
No. PI006-A-P-SD-2.0
TITLE SNT-6A(H)-A-PKG Dimensions
No.
SCALE
UNIT
PI006-A-P-SD-2.0
mm
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ø1.5
+0.1
-0
2.0±0.05
4.0±0.1
0.25±0.05
1.85±0.05
+0.1
ø0.5 -0
4.0±0.1
0.65±0.05
321
4 56
Feed direction
No. PI006-A-C-SD-1.0
TITLE S N T - 6 A ( H ) - A - C a r r i e r T a p e
No.
SCALE
UNIT
PI006-A-C-SD-1.0
mm
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12.5max.
Enlarged drawing in the central part
ø13±0.2
9.0±0.3
(60°) (60°)
No. PI006-A-R-SD-1.0
TITLE
No.
SCALE
UNIT
SNT-6A(H)-A-Reel
PI006-A-R-SD-1.0
QTY.
5,000
mm
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0.52
2
1.36
0.52
0.2 0.3 1
1.
2.
1.
2.
3.
4.
SNT
(0.25 mm min. / 0.30 mm typ.)
(1.30 mm ~ 1.40 mm)
0.03 mm
1. Pay attention to the land pattern width (0.25 mm min. / 0.30 mm typ.).
2. Do not widen the land pattern to the center of the package (1.30 mm to 1.40 mm).
Caution 1. Do not do silkscreen printing and solder printing under the mold resin of the package.
2. The thickness of the solder resist on the wire pattern under the package should be 0.03 mm
or less from the land pattern surface.
3. Match the mask aperture size and aperture position with the land pattern.
4. Refer to "SNT Package User's Guide" for details.
1. (0.25 mm min. / 0.30 mm typ.)
2. (1.30 mm ~ 1.40 mm)
No. PI006-A-L-SD-4.1
TITLE SNT-6A(H)-A-Land Recommendation
No.
SCALE
UNIT
PI006-A-L-SD-4.1
mm
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2.9±0.2
1.9±0.2
54
123
0.95±0.1
0.4±0.1
0.16
+0.1
-0.06
No. MP005-A-P-SD-1.2
TITLE
No.
SCALE
UNIT
SOT235-A-PKG Dimensions
MP005-A-P-SD-1.2
mm
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+0.1
ø1.5 -0
2.0±0.05
4.0±0.1(10 pitches:40.0±0.2)
0.25±0.1
ø1.0
+0.2
-0
4.0±0.1
3.2±0.2
1.4±0.2
321
45
Feed direction
No. MP005-A-C-SD-2.1
TITLE
No.
SCALE
UNIT
SOT235-A-Carrier Tape
MP005-A-C-SD-2.1
mm
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12.5max.
Enlarged drawing in the central part
ø13±0.2
9.0±0.3
(60°) (60°)
No. MP005-A-R-SD-1.1
TITLE
No.
SCALE
UNIT
SOT235-A-Reel
MP005-A-R-SD-1.1
QTY.
3,000
mm
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www.sii-ic.com
The information described herein is subject to change without notice.
Seiko Instruments Inc. is not responsible for any problems caused by circuits or diagrams described herein
whose related industrial properties, patents, or other rights belong to third parties. The application circuit
examples explain typical applications of the products, and do not guarantee the success of any specific
mass-production design.
When the products described herein are regulated products subject to the Wassenaar Arrangement or other
agreements, they may not be exported without authorization from the appropriate governmental authority.
Use of the information described herein for other purposes and/or reproduction or copying without the
express permission of Seiko Instruments Inc. is strictly prohibited.
The products described herein cannot be used as part of any device or equipment affecting the human
body, such as exercise equipment, medical equipment, security systems, gas equipment, vehicle equipment,
in-vehicle equipment, aviation equipment, aerospace equipment, and nuclear-related equipment, without prior
written permission of Seiko Instruments Inc.
The products described herein are not designed to be radiation-proof.
Although Seiko Instruments Inc. exerts the greatest possible effort to ensure high quality and reliability, the
failure or malfunction of semiconductor products may occur. The user of these products should therefore
give thorough consideration to safety design, including redundancy, fire-prevention measures, and
malfunction prevention, to prevent any accidents, fires, or community damage that may ensue.



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