Rev.1.2
_00
HIGH RIPPLE-REJECTION
LOW DROPOUT CMOS VOLTAGE REGULATOR
S-T111 Series
The S-T111 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. Compared with the voltage
regulators using the conventional CMOS process,
a larger variety of capacitors are available,
including small ceramic capacitors. A small SOT-
23-5 package realizes high-density mounting.
Features
1.5 V to 5.5 V, selectable in 0.1 V steps.
±1.0%
190 mV typ. (3.0 V output product, I
OUT
=
100 mA)
During operation: 50
µA
typ., 90
µA
max.
During shutdown: 0.1
µA
typ., 1.0
µA
max.
*1
•
High peak current capability:
150 mA output is possible (@ V
IN
≥
V
OUT(S)
+
1.0 V)
Ensures long battery life.
•
Built-in ON/OFF circuit:
•
Low ESR capacitor can be used: A ceramic capacitor of 0.1
µF
or more can be used for the output
capacitor.
80 dB typ. (@ 1.0 kHz)
•
High ripple rejection:
Overcurrent of output transistor can be restricted.
•
Built-in overcurrent protector:
SOT-23-5
•
Small package:
*1.
Attention should be paid to the power dissipation of the package when the output current is large.
•
Output voltage:
•
High-accuracy output voltage:
•
Low dropout voltage:
•
Low current consumption:
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
•
SOT-23-5
(Package drawing code: MP005-A)
Seiko Instruments Inc.
1
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.1.2
_00
S-T111 Series
Block Diagram
*1
VIN
Overcurrent
protector
VOUT
ON/OFF
ON/OFF
circuit
+
−
Reference
voltage circuit
VSS
*1.
Parasitic diode
Figure 1
2
Seiko Instruments Inc.
Rev.1.2
_00
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-T111 Series
Product Code Structure
•
The product types and output voltage for the S-T111 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 list” for
the full product names.
1. Product name
S-T111
x
xx
xx
–
xxx
–
TF
IC direction in tape specifications
Product name (abbreviation)
*2
*1
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
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) under the Operation.
2. Product name list
Table 1
Output Voltage
Product Name
1.5 V ±1.0%
S-T111B15MC-OGA-TF
1.8 V ±1.0%
S-T111B18MC-OGD-TF
2.5 V ±1.0%
S-T111B25MC-OGK-TF
2.6 V ±1.0%
S-T111B26MC-OGL-TF
2.7 V ±1.0%
S-T111B27MC-OGM-TF
2.8 V ±1.0%
S-T111B28MC-OGN-TF
2.9 V ±1.0%
S-T111B29MC-OGO-TF
3.0 V ±1.0%
S-T111B30MC-OGP-TF
3.1 V ±1.0%
S-T111B31MC-OGQ-TF
3.3 V ±1.0%
S-T111B33MC-OGS-TF
5.0 V ±1.0%
S-T111B50MC-OHJ-TF
Remark
Please contact the SII marketing department for products
with an output voltage other than those specified above or
type A products.
*3
Seiko Instruments Inc.
3
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.1.2
_00
S-T111 Series
Pin Configuration
SOT-23-5
Top view
5
4
Table 2
Pin No.
1
2
3
4
5
Symbol
ON/OFF
VSS
*1
NC
VOUT
VIN
Description
Shutdown pin
GND pin
No connection
Output voltage pin
Input voltage pin
*1.
The NC pin is electrically open.
The NC pin can be connected to VIN or VSS.
1
2
3
Figure 2
Absolute Maximum Ratings
Table 3
Item
Input voltage
Output voltage
Power dissipation
Operating ambient temperature
Storage ambient temperature
Symbol
V
IN
V
ON/OFF
V
OUT
P
D
T
opr
T
stg
(Ta
=
25°C unless otherwise specified)
Absolute Maximum Rating
Unit
V
V
SS
−
0.3 to V
SS
+
7
V
SS
−
0.3 to V
IN
+
0.3
V
SS
−
0.3 to V
IN
+
0.3
300
mW
−40
to
+85
°C
−40
to
+125
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.
4
Seiko Instruments Inc.
Rev.1.2
_00
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
S-T111 Series
Table 4
(Ta
=
25°C unless otherwise specified)
Electrical Characteristics
Test
Circuit
1
3
1
Item
Output voltage
*1
Symbol
V
OUT(E)
I
OUT
V
drop
Conditions
V
IN
=
V
OUT(S)
+
1.0 V, I
OUT
=
30 mA
V
IN
≥
V
OUT(S)
+
1.0 V
I
OUT
=
50 mA
1.5 V
≤
V
OUT(S)
≤
2.7 V
2.8 V
≤
V
OUT(S)
≤
5.5 V
I
OUT
=
100 mA
1.5 V
≤
V
OUT(S)
≤
1.6 V
1.7 V
≤
V
OUT(S)
≤
1.8 V
1.9 V
≤
V
OUT(S)
≤
2.3 V
2.4 V
≤
V
OUT(S)
≤
2.7 V
2.8 V
≤
V
OUT(S)
≤
5.5 V
V
OUT(S)
+
0.5 V
≤
V
IN
≤
6.5 V,
I
OUT
=
30 mA
V
IN
=
V
OUT(S)
+
1.0 V,
1.0 mA
≤
I
OUT
≤
80 mA
V
IN
=
V
OUT(S)
+
1.0 V, I
OUT
=
10 mA,
−40°C ≤
Ta
≤
85°C
V
IN
=
V
OUT(S)
+
1.0 V, ON/OFF pin
=
ON,
no load
V
IN
=
V
OUT(S)
+
1.0 V, ON/OFF pin
=
OFF,
no load
V
IN
=
V
OUT(S)
+
1.0 V, R
L
=
1.0 kΩ
V
IN
=
V
OUT(S)
+
1.0 V, R
L
=
1.0 kΩ
V
IN
=
6.5 V, V
ON/OFF
=
6.5 V
V
IN
=
6.5 V, V
ON/OFF
=
0 V
V
IN
=
V
OUT(S)
+
1.0 V, f
=
1.0 kHz,
∆V
rip
=
0.5 Vrms, I
OUT
=
30 mA
V
IN
=
V
OUT(S)
+
1.0 V, ON/OFF pin
=
ON,
V
OUT
=
0 V
Min.
Typ.
Max.
Unit
V
mA
V
Output current
*3
Dropout voltage
*2
Line regulation
Load regulation
Output voltage
*4
temperature coefficient
Current consumption
during operation
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”
Ripple rejection
Short-circuit current
∆
V
OUT1
∆
V
IN
•
V
OUT
∆V
OUT2
∆
V
OUT
∆
Ta
•
V
OUT
I
SS1
I
SS2
V
IN
V
SH
V
SL
I
SH
I
SL
RR
I
short
V
OUT(S)
V
OUT(S)
V
OUT(S)
×
0.99
×
1.01
*5
150
Not specified
0.08
0.14
0.32
0.55
0.28
0.47
0.25
0.35
0.20
0.29
0.19
0.26
2.0
1.5
−0.1
−0.1
0.05
12
±100
50
0.1
80
200
0.2
40
90
1.0
6.5
0.3
0.1
0.1
%/V
mV
ppm
/
°C
µA
2
V
4
µA
dB
mA
5
3
*1.
V
OUT(S)
: Specified output voltage
V
OUT(E)
: Actual output voltage at the fixed load
The output voltage when fixing I
OUT
(= 30 mA) and inputting V
OUT(S)
+
1.0 V
*2.
The output current at which the output voltage becomes 95% of V
OUT(E)
after gradually increasing the output current.
*3.
V
drop
=
V
IN1
−
(V
OUT3
×
0.98)
V
OUT3
is the output voltage when V
IN
=
V
OUT(S)
+
1.0 V and I
OUT
50 mA or I
OUT
=
100 mA.
V
IN1
is the input voltage at which the output voltage becomes 98% of V
OUT3
after gradually decreasing the input voltage.
*4.
The change in temperature [mV/°C] is calculated using the following equation.
∆
V
OUT
[
mV/
°
C
]
*1
=
V
OUT(S)
[
V
]
*2
× ∆
V
OUT
[
ppm/
°
C
]
*3
÷
1000
∆
Ta
∆
Ta
•
V
OUT
*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.
5
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