Seiko Instruments Electronic Components Datasheet


S-1111

(S-1111 / S-1121) HIGH RIPPLE-REJECTION LOW DROPOUT


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Rev.4.1_00
HIGH RIPPLE-REJECTION LOW DROPOUT
CMOS VOLTAGE REGULATOR
S-1111/1121 Series
www.datasheet4u.com
The S-1111/1121 Series is a positive voltage
regulator with a low dropout voltage, high output
voltage accuracy, 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 protector prevents the load
current from exceeding the current capacitance of
the output transistor. An ON/OFF circuit ensures a
long battery life, and a small SOT-23-5 package
realize high-density mounting. The lineup includes
the S-1111 and S-1121 Series, which differ in pin
configuration.
„ Features
Output voltage:
High-accuracy output voltage:
Low dropout voltage:
Low current consumption:
High peak current capability:
Built-in ON/OFF circuit:
High ripple rejection:
Built-in overcurrent protector:
Small package:
Lead-free products
1.5 V to 5.5 V, selectable in 0.1 V steps.
±1.0%
200 mV typ. (3.0 V output product, IOUT = 100 mA)
During operation: 35 μA typ., 65 μA max.
During shutdown: 0.1 μA typ., 1.0 μA max.
150 mA output is possible (at VIN VOUT(S) + 1.0 V)*1
Ensures long battery life.
70 dB typ. (at 1.0 kHz)
Overcurrent of output transistor can be restricted.
SOT-23-5
*1. Attention should be paid to the power dissipation of the package when the output current is large.
„ Applications
Power supply for battery-powered devices
Power supply for personal communication devices
Power supply for home electric/electronic appliances
Power supply for cellular phones
„ Package
Package Name
SOT-23-5
Package
MP005-A
Drawing Code
Tape
MP005-A
Reel
MP005-A
Seiko Instruments Inc.
1


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HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1111/1121 Series
Rev.4.1_00
„ Block Diagram
www.datasheet4u.cVomIN
*1
VOUT
Overcurrent
protector
ON/OFF
ON/OFF
circuit
+
Reference
voltage circuit
VSS
*1. Parasitic diode
Figure 1
2 Seiko Instruments Inc.


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HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.4.1_00
S-1111/1121 Series
„ Product Name Structure
The product types and output voltage for the S-1111/1121 Series can be selected at the user’s request.
Refer to the “Product name” for the meanings of the characters in the product name and “Product name
www.datasheelits4tu.cfomr the full product names.
1. Product name (S-1111 Series)
S-1111 x
xx MC – xxx
TF G
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 taping specifications at the end of this book.
*2. Refer to the “Product name list”.
*3. Refer to 3. Shutdown (ON/OFF pin) in the “Operation”.
Seiko Instruments Inc.
3


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HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1111/1121 Series
Rev.4.1_00
2. Product name list (S-1111 Series)
www.datasheet4u.com
Table 1
Output Voltage
SOT-23-5
1.5V±1.0%
1.6V±1.0%
1.7V±1.0%
1.8V±1.0%
1.9V±1.0%
2.0V±1.0%
2.1V±1.0%
2.2V±1.0%
2.3V±1.0%
2.4V±1.0%
2.5V±1.0%
2.6V±1.0%
2.7V±1.0%
2.8V±1.0%
2.9V±1.0%
3.0V±1.0%
3.1V±1.0%
3.2V±1.0%
3.3V±1.0%
3.4V±1.0%
3.5V±1.0%
3.6V±1.0%
3.7V±1.0%
3.8V±1.0%
3.9V±1.0%
4.0V±1.0%
4.1V±1.0%
4.2V±1.0%
4.3V±1.0%
4.4V±1.0%
4.5V±1.0%
4.6V±1.0%
4.7V±1.0%
4.75V±1.0%
S-1111B15MC-NYATFG
S-1111B16MC-NYBTFG
S-1111B17MC-NYCTFG
S-1111B18MC-NYDTFG
S-1111B19MC-NYETFG
S-1111B20MC-NYFTFG
S-1111B21MC-NYGTFG
S-1111B22MC-NYHTFG
S-1111B23MC-NYITFG
S-1111B24MC-NYJTFG
S-1111B25MC-NYKTFG
S-1111B26MC-NYLTFG
S-1111B27MC-NYMTFG
S-1111B28MC-NYNTFG
S-1111B29MC-NYOTFG
S-1111B30MC-NYPTFG
S-1111B31MC-NYQTFG
S-1111B32MC-NYRTFG
S-1111B33MC-NYSTFG
S-1111B34MC-NYTTFG
S-1111B35MC-NYUTFG
S-1111B36MC-NYVTFG
S-1111B37MC-NYWTFG
S-1111B38MC-NYXTFG
S-1111B39MC-NYYTFG
S-1111B40MC-NYZTFG
S-1111B41MC-NZATFG
S-1111B42MC-NZBTFG
S-1111B43MC-NZCTFG
S-1111B44MC-NZDTFG
S-1111B45MC-NZETFG
S-1111B46MC-NZFTFG
S-1111B47MC-NZGTFG
4.8V±1.0%
4.9V±1.0%
5.0V±1.0%
5.1V±1.0%
5.2V±1.0%
5.3V±1.0%
5.4V±1.0%
5.5V±1.0%
S-1111B48MC-NZHTFG
S-1111B49MC-NZITFG
S-1111B50MC-NZJTFG
S-1111B51MC-NZKTFG
S-1111B52MC-NZLTFG
S-1111B53MC-NZMTFG
S-1111B54MC-NZNTFG
S-1111B55MC-NZOTFG
Remark Please contact our sales office for type A products.
4 Seiko Instruments Inc.


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HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.4.1_00
S-1111/1121 Series
3. Product name (S-1121 Series)
S-1121
www.datasheet4u.com
x
xx MC – xxx
TF G
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 taping specifications at the end of this book.
*2. Refer to the “Product name list”.
*3. Refer to 3. Shutdown pin (ON/OFF pin) in the “Operation”.
Seiko Instruments Inc.
5


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HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1111/1121 Series
Rev.4.1_00
4. Product name list (S-1121 Series)
www.datasheet4u.com
Table 2
Output Voltage
SOT-23-5
1.5V±1.0%
S-1121B15MC-N2ATFG
1.6V±1.0%
S-1121B16MC-N2BTFG
1.7V±1.0%
S-1121B17MC-N2CTFG
1.8V±1.0%
S-1121B18MC-N2DTFG
1.9V±1.0%
S-1121B19MC-N2ETFG
2.0V±1.0%
S-1121B20MC-N2FTFG
2.1V±1.0%
S-1121B21MC-N2GTFG
2.2V±1.0%
S-1121B22MC-N2HTFG
2.3V±1.0%
S-1121B23MC-N2ITFG
2.4V±1.0%
S-1121B24MC-N2JTFG
2.5V±1.0%
S-1121B25MC-N2KTFG
2.6V±1.0%
S-1121B26MC-N2LTFG
2.7V±1.0%
S-1121B27MC-N2MTFG
2.8V±1.0%
S-1121B28MC-N2NTFG
2.9V±1.0%
S-1121B29MC-N2OTFG
3.0V±1.0%
S-1121B30MC-N2PTFG
3.1V±1.0%
S-1121B31MC-N2QTFG
3.2V±1.0%
S-1121B32MC-N2RTFG
3.3V±1.0%
S-1121B33MC-N2STFG
3.4V±1.0%
S-1121B34MC-N2TTFG
3.5V±1.0%
S-1121B35MC-N2UTFG
3.6V±1.0%
S-1121B36MC-N2VTFG
3.7V±1.0%
S-1121B37MC-N2WTFG
3.8V±1.0%
S-1121B38MC-N2XTFG
3.9V±1.0%
S-1121B39MC-N2YTFG
4.0V±1.0%
S-1121B40MC-N2ZTFG
4.1V±1.0%
S-1121B41MC-N3ATFG
4.2V±1.0%
S-1121B42MC-N3BTFG
4.3V±1.0%
S-1121B43MC-N3CTFG
4.4V±1.0%
S-1121B44MC-N3DTFG
4.5V±1.0%
S-1121B45MC-N3ETFG
4.6V±1.0%
S-1121B46MC-N3FTFG
4.7V±1.0%
S-1121B47MC-N3GTFG
4.75V±1.0%
S-1121B4HMC-N3PTFG
4.8V±1.0%
S-1121B48MC-N3HTFG
4.9V±1.0%
S-1121B49MC-N3ITFG
5.0V±1.0%
S-1121B50MC-N3JTFG
5.1V±1.0%
S-1121B51MC-N3KTFG
5.2V±1.0%
S-1121B52MC-N3LTFG
5.3V±1.0%
S-1121B53MC-N3MTFG
5.4V±1.0%
S-1121B54MC-N3NTFG
5.5V±1.0%
S-1121B55MC-N3OTFG
Remark Please contact our sales office for type A products.
6 Seiko Instruments Inc.


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HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.4.1_00
S-1111/1121 Series
„ Pin Configuration
SOT-23-5
w w w . d Taoptvieaw s h e e t 4 u .Pinc Noo. m
54
1
Table 3
Symbol
VIN
(S-1111 Series)
Description
Input voltage pin
2 VSS
GND pin
3 ON/OFF
4 NC*1
Shutdown pin
No connection
5
VOUT
Output voltage pin
*1. The NC pin is electrically open.
The NC pin can be connected to VIN or VSS.
123
Figure 2
Table 4
(S-1121 Series)
Pin No.
Symbol
Description
1
VOUT
Output voltage pin
2 VSS
GND pin
3 VIN
Input voltage pin
4 ON/OFF
5 NC*1
Shutdown pin
No connection
*1. The NC pin is electrically open.
The NC pin can be connected to VIN or VSS.
Seiko Instruments Inc.
7


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HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1111/1121 Series
Rev.4.1_00
„ Absolute Maximum Ratings
Table 5
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Item
Symbol
(Ta = 25 °C unless otherwise specified)
Absolute Maximum Rating
Unit
Input voltage
Output voltage
Power dissipation
VIN
VON/OFF
VOUT
PD
VSS 0.3 to VSS + 7
VSS 0.3 to VIN + 0.3
VSS 0.3 to VIN + 0.3
300 (When not mounted on board)
600*1
V
V
V
mW
mW
Operating ambient temperature
Storage temperature
Topr
Tstg
40 to +85
40 to +125
°C
°C
*1. When mounted on board
[Mounted on board]
(1) Board size : 114.3 mm × 76.2 mm × t1.6 mm
(2) Board name : JEDEC STANDARD51-7
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
400
300
200
100
0
0 50 100 150
Ambient temperature (Ta) [°C]
Figure 3 Power Dissipation of Package (When Mounted on Board)
8 Seiko Instruments Inc.


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HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.4.1_00
S-1111/1121 Series
„ Electrical Characteristics
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Item
Symbol
Table 6
Conditions
(Ta = 25 °C unless otherwise specified)
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
Vdrop
ΔVOUT1
ΔVINVOUT
ΔVOUT2
ΔVOUT
ΔTa VOUT
VIN VOUT(S) + 1.0 V
IOUT = 100 mA
1.5 V VOUT(S) 1.9 V
2.0 V VOUT(S) 2.4 V
2.5 V VOUT(S) 2.7 V
2.8 V VOUT(S) 3.3 V
3.4 V VOUT(S) 5.5 V
VOUT(S) + 0.5 V VIN 6.5 V,
IOUT = 30 mA
VIN = VOUT(S) + 1.0 V,
1.0 mA IOUT 80 mA
VIN = VOUT(S) + 1.0 V, IOUT = 10 mA,
40°C Ta 85°C
VOUT(S)
× 0.99
150*5
VOUT(S)
0.60
0.35
0.24
0.20
0.17
VOUT(S)
× 1.01
1.40
0.70
0.35
0.30
0.26
V
mA
V
V
V
V
V
1
3
1
1
1
1
1
0.05 0.2 % / V 1
20 40 mV 1
±100
ppm
/ °C
1
Current consumption
during operation
ISS1
VIN = VOUT(S) + 1.0 V, ON/OFF pin = ON,
no load
35 65 μA 2
Current consumption
during shutdown
ISS2
VIN = VOUT(S) + 1.0 V, ON/OFF pin = OFF,
no load
0.1 1.0 1 2
Input voltage
VIN
Shutdown pin
input voltage “H”
VSH
VIN = VOUT(S) + 1.0 V, RL = 1.0 kΩ
2.0 6.5 V
1.5
V4
Shutdown pin
input voltage “L”
VSL
VIN = VOUT(S) + 1.0 V, RL = 1.0 kΩ
⎯ ⎯ 0.3 V 4
Shutdown pin
input current “H”
ISH
VIN = 6.5 V, VON/OFF = 6.5 V
0.1
0.1 μA 4
Shutdown 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
70 dB 5
Short-circuit current
Ishort
VIN = VOUT(S) + 1.0 V, ON/OFF pin = ON,
VOUT = 0 V
250 mA 3
*1. VOUT(S): Specified output voltage
VOUT(E): Actual output voltage at the fixed load
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) + 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. The change in temperature [mV/°C] is calculated using the following equation.
[ ] [ ] [ ]ΔVOUT
mV/°C
= V*1
OUT(S)
V
*2 ×
ΔVOUT
ppm/°C *3 ÷ 1000
ΔTa
ΔTa VOUT
*1. The change in temperature of the output voltage
*2. Specified 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.
Seiko Instruments Inc.
9


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HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1111/1121 Series
Rev.4.1_00
„ Test Circuits
1.
www.datasheet4u.com
VIN VOUT
ON/OFF VSS
Set to
power ON
+A
+
V
Figure 4
2. +
A VIN
VOUT
ON/OFF
VSS
Set to
VIN or GND
Figure 5
3.
VIN VOUT
+
A
ON/OFF VSS
Set to
power ON
+
V
Figure 6
4.
VIN VOUT
+
A ON/OFF
VSS
+
V RL
Figure 7
5.
VIN VOUT
ON/OFF
VSS
+
V RL
Set to
Power ON
Figure 8
10 Seiko Instruments Inc.


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HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.4.1_00
S-1111/1121 Series
„ Standard Circuit
www.datasheet4u.com
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 tantalum capacitor (2.2 μF or more) can be used.
Figure 9
Caution The above connection diagram and constant will not guarantee successful operation.
Perform thorough evaluation using the actual application to set the constant.
„ Application Conditions
Input capacitor (CIN): 1.0 μF or more
Output capacitor (CL): 2.2 μF or more (tantalum capacitor)
Caution A general series regulator may oscillate, depending on the external components selected.
Check that no oscillation occurs with the application using the above capacitor.
Seiko Instruments Inc.
11


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HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1111/1121 Series
Rev.4.1_00
„ Explanation of Terms
1. Low dropout voltage regulator
www.datasheetT4hu.ecolmow dropout voltage regulator is a voltage regulator whose dropout voltage is low due to its built-in
low on-resistance transistor.
2. 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. Please see the electrical characteristics and
attached characteristics data for details.
3.
Line
regulation
⎜⎜⎝⎛
ΔV OUT1
ΔV IN VOUT
⎟⎟⎠⎞
Indicates the dependency of the output voltage on the input voltage. That is, the value shows how much
the output voltage changes due to a change in the input voltage with the output current remaining
unchanged.
4. Load regulation (ΔVOUT2)
Indicates the dependency of the output voltage on the output current. That is, the value shows how
much the output voltage changes due to a change in the output current with the input voltage remaining
unchanged.
5. Dropout voltage (Vdrop)
Indicates the difference between the input voltage VIN1, which is the input voltage (VIN) at the point where
the output voltage has fallen to 98% of the output voltage value VOUT3 after VIN was gradually decreased
from VIN = VOUT(S) + 1.0 V, and the output voltage at that point (VOUT3 × 0.98).
Vdrop = VIN1 (VOUT3 × 0.98)
12 Seiko Instruments Inc.


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HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.4.1_00
S-1111/1121 Series
6.
Temperatur
e
coefficien
t
of
output
voltage
⎜⎜⎝⎛
Δ V OUT
ΔTa VOUT
⎟⎟⎠⎞
The shadowed area in Figure 10 is the range where VOUT varies in the operating temperature range
www.datasheetw4uh.econmthe temperature coefficient of the output voltage is ±100 ppm/°C.
Ex. S-1111/1121B28 Typ.
VOUT
[V]
+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 25°C.
Figure 10
A change in the temperature of the output voltage [mV/°C] is calculated using the following equation.
[ ] [ ] [ ]ΔVOUT mV/°C *1 = VOUT(S) V *2 × ΔVOUT ppm/°C *3 ÷ 1000
ΔTa
ΔTa VOUT
*1. Change in temperature of output voltage
*2. Specified output voltage
*3. Output voltage temperature coefficient
Seiko Instruments Inc.
13


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HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1111/1121 Series
Rev.4.1_00
„ Operation
1. Basic operation
www.datasheetF4iug.cuorme 11 shows the block diagram of the S-1111/1121 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 the output transistor with the gate voltage necessary
to ensure a certain output voltage free of any fluctuations of input voltage and temperature.
VIN
Current
supply
Vref
Error
amplifier
+
Reference voltage
circuit
*1
Rf
Vfb
Rs
VOUT
VSS
*1. Parasitic diode
Figure 11
2. Output transistor
The S-1111/1121 Series uses a low on-resistance P-channel MOS FET 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 flowing from VOUT pin through a parasitic diode to VIN pin.
14 Seiko Instruments Inc.


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HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.4.1_00
S-1111/1121 Series
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 operation of all internal circuits stops, and the built-
www.datasheinet4Pu-.ccohmannel MOS FET output transistor between the VIN pin and VOUT pin is turned off to substantially
reduce the current consumption. The VOUT pin becomes the VSS level due to the internally divided
resistance of several hundreds kΩ between the VOUT pin and VSS pin.
The structure of the ON/OFF pin is 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. 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 the ON/OFF pin is not
used, connect it to the VSS pin if the logic type is “A” and to the VIN pin if it is “B”.
Table 7
Logic Type
A
A
B
B
ON/OFF Pin
“L”: Power on
“H”: Power off
“L”: Power off
“H”: Power on
Internal Circuits
Operating
Stopped
Stopped
Operating
VOUT Pin Voltage
Set value
VSS level
VSS level
Set value
Current Consumption
ISS1
ISS2
ISS2
ISS1
VIN
ON/OFF
VSS
Figure 12
„ Selection of Output Capacitor (CL)
The S-1111/1121 Series performs phase compensation using the internal phase compensator in the IC and the
ESR (Equivalent Series Resistance) of the output capacitor to enable stable operation independent of changes
in the output load. Therefore, always place a capacitor (CL) of 2.2 μF or more between VOUT and VSS pins.
For stable operation of the S-1111/1121 Series, it is essential to employ a capacitor whose ESR is within an
optimum range. Using a capacitor whose ESR is outside the optimum range (approximately 0.5 to 5 Ω),
whether larger or smaller, may cause an unstable output, resulting in oscillation. For this reason, a tantalum
electrolytic capacitor is recommended.
When a ceramic capacitor or an OS capacitor with a low ESR is used, it is necessary to connect an additional
resistor that serves as the ESR in series with the output capacitor. The required resistance value is
approximately 0.5 to 5 Ω, which varies depending on the usage conditions, so perform sufficient evaluation for
selection. Ordinarily, around 1.0 Ω is recommended.
Note that an aluminum electrolytic capacitor may increase the ESR at a low temperature, causing oscillation.
When using this kind of capacitor, perform thorough evaluation, including evaluation of temperature
characteristics.
Seiko Instruments Inc.
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HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1111/1121 Series
Rev.4.1_00
„ 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
www.datasheett4hue.coinmput between 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 increase when a series regulator is used at low load current (1.0 mA or
less).
This IC performs phase compensation by using an internal phase compensator and the ESR of an
output capacitor. Therefore, always place a capacitor of 2.2 μF or more between VOUT and VSS pins.
A tantalum type capacitor is recommended. Moreover, to secure stable operation of the S-1111/1121
Series, it is necessary to employ a capacitor with an ESR within an optimum range (0.5 to 5 Ω). Using a
capacitor whose ESR is outside the optimum range (approximately 0.5 to 5 Ω), whether larger or
smaller, may cause an unstable output, resulting in oscillation. Perform sufficient evaluation under the
actual usage conditions for selection, including evaluation of temperature characteristics.
The voltage regulator may oscillate when the impedance of the power supply is high and the input
capacitor is small or an input capacitor is not connected.
The application conditions for the input voltage, output voltage, and 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
6 in the 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 LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.4.1_00
S-1111/1121 Series
„ Characteristics (Typical Data)
Remark The following, which describes the S-1111 Series as the typical product, shows typical data
w w w . d a t a scohmemeont t4o tuhe. Sc -o11m21 Series.
(1) Output Voltage vs. Output current (when load current increases)
S-1111B15 (Ta = 25 °C)
S-1111B30 (Ta = 25 °C)
2.5
2
1.5
1
0.5
0
0
2.0 V
VIN = 1.8 V
6.5 V
100 200 300
2.5 V
400 500
600
4
3.5
3
2.5
2
1.5
1
0.5
0
0
4.0 V
6.5 V
3.5 V
VIN = 3.3 V
100 200 300 400 500 600
IOUT [mA]
IOUT [mA]
S-1111B50 (Ta = 25 °C)
6
5
4
6.0 V
6.5 V
3
2 5.5 V
1 VIN = 5.3 V
0
0 100 200 300 400 500 600
IOUT [mA]
(2) Output voltage vs. Input voltage
S-1111B15 (Ta = 25 °C)
1.6
50 mA
1.55
30 mA
1.5
IOUT = 1 mA
1.45 80 mA
1.4
1
1.5 2 2.5 3 3.5
VIN [V]
Remark In determining the output current,attention
should be paid to the following.
1) The minimum output current value
and footnote *5 in the electrical
characteristics
2) The package power dissipation
S-1111B30 (Ta = 25 °C)
3.05
50 mA
IOUT = 1 mA
3
30 mA
2.95
80 mA
2.9
2.85
2.8
2.5 3 3.5 4 4.5
VIN [V]
5
S-1111B50 (Ta = 25 °C)
5.1
5.08
5.06
5.04
5.02
5 30 mA
4.98
4.96
4.94
4.92
4.9
IOUT = 1 mA
50 mA
80 mA
4.5 5 5.5 6
VIN [V]
6.5
7
Seiko Instruments Inc.
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HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1111/1121 Series
Rev.4.1_00
(3) Dropout voltage vs. Output current
S-1111B15
S-1111B30
w w 0.w45 . d a t a s h e 0e.3 t 4 u . c o m
0.4
0.35
0.3
85°C
25°C
0.25
0.2
85°C
25°C
0.25
0.2
0.15
-40°C
0.15
0.1
-40°C
0.1
0.05
0.05
00
0 50 100 150 200
0 50 100 150 200
IOUT [mA]
IOUT [mA]
S-1111B50
0.25
0.2
0.15
0.1
0.05
0
0
85°C
25°C
40°C
50 100
IOUT [mA]
150
200
(4) Dropout voltage vs. Set output voltage
0.4
0.35 150 mA
0.3
0.25 100 mA
0.2
0.15
0.1
0.05
0
50 mA
30 mA
10 mA
0123456
VOTA [V]
7
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HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.4.1_00
S-1111/1121 Series
(5) Output voltage vs. Ambient temperature
S-1111B15
www.datasheet41u..6com
1.55
1.5
1.45
1.4
-40 -20 0 20 40 60 80 100
Ta [°C]
S-1111B50
5.1
5.08
5.06
5.04
5.02
5
4.98
4.96
4.94
4.92
4.9
-40 -20 0 20 40 60 80 100
Ta [°C]
(6) Current consumption vs. Input voltage
S-1111B15
45
40
35 25°C
30 85°C
25 40°C
20
15
10
5
0
0 24 6
VIN [V]
8
S-1111B50
45
40
35
30
25
20
15
10
5
0
0
85°C
40°C
24
VIN [V]
25°C
68
S-1111B30
3.1
3.05
3
2.95
2.9
-40 -20 0 20 40 60 80 100
Ta [°C]
S-1111B30
45
40
35 25°C
30
25
20
85°C
40°C
15
10
5
0
0 24 6
VIN [V]
8
Seiko Instruments Inc.
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HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-1111/1121 Series
Rev.4.1_00
(7) Ripple rejection
S-1111B15 (Ta = 25 °C)
www.daVtaINsh=e2e.t54uV.,cComOUT = 2.2 μF
100
80
60
IOUT = 1 mA
40
20
0
10
30 mA
50 mA
100 1 k 10 k 100 k
Frequency [Hz]
1M
S-1111B50 (Ta = 25 °C)
VIN = 6.0 V, COUT = 2.2 μF
100
80
60
IOUT = 1 mA
40
20
0
10
30 mA
50 mA
100 1 k 10 k
Frequency [Hz]
100 k
1M
S-1111B30 (Ta = 25 °C)
VIN = 4.0 V, COUT = 2.2 μF
100
80
60
IOUT = 1 mA
40
20
0
10
30 mA
50 mA
100 1 k 10 k 100 k
Frequency [Hz]
1M
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HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.4.1_00
S-1111/1121 Series
„ Reference Data
(1) Input transient response characteristics
www.daItOaUsTh=ee3t04um.cAo,mtr = tf = 5.0 μs, COUT = 2.2 μF, CIN = 0 μF
3.025
6
3.02 5
3.015
3.01
3.005
4
V IN
V OUT
3
2
31
2.995
0
-20 0 20 40 60 80 100 120 140 160 180
t [μs]
(2) Load transient response characteristics
VIN = 4.0 V, COUT = 2.2 μF, CIN = 1.0 μF,
IOUT = 50100 mA
3.2 150
3.15 100
3.1 50
3.05
IOUT
0
3 -50
2.95 -100
VOUT
2.9 -150
-2 0 2 4 6 8 10 12 14 16 18
t [μs]
(3) Shutdown pin transient response characteristics
S-1111B15 (Ta = 25 °C)
VIN = 2.5 V, COUT = 2.2 μF, CIN = 1.0 μF
2.5 3
2 VON/OFF
1.5
2
1
10
VOUT
0.5 -1
0 -2
-0.5 -3
-10 0 10 20 30 40 50 60 70 80 90
t [μs]
S-1111B50 (Ta = 25 °C)
VIN = 6.0 V, COUT = 2.2 μF, CIN = 1.0 μF
78
6
5 VON/OFF
6
4
42
30
2
VOUT
-2
1 -4
0 -6
-1 -8
-10 0 10 20 30 40 50 60 70 80 90
t [μs]
IOUT = 30 mA, tr = tf = 5.0 μs, COUT = 4.7 μF, CIN = 0 μF
3.025
6
3.02 5
3.015
3.01
3.005
4
VIN
VOUT
3
2
31
2.995
0
-20 0 20 40 60 80 100 120 140 160 180
t [μs]
VIN = 4.0 V, COUT = 4.7 μF, CIN = 1.0 μF,
IOUT = 50100 mA
3.2 150
3.15 100
3.1
3.05
IOUT
50
0
3 -50
2.95
VOUT
-100
2.9 -150
-2 0 2 4 6 8 10 12 14 16 18
t [μs]
S-1111B30 (Ta = 25 °C)
VIN = 4.0 V, COUT = 2.2 μF, CIN = 1.0 μF
5
6
4
VON/OFF
3
4
2
20
VOUT
1 -2
0 -4
-1 -6
-10 0 10 20 30 40 50 60 70 80 90
t [μs]
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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
Seiko Instruments Inc.


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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, or any apparatus
installed in airplanes and other vehicles, without prior written permission of Seiko Instruments Inc.
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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