Rev.2.0
_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.
•
High peak current capability:
150 mA output is possible (at V
IN
≥
V
OUT(S)
+
1.0 V)
*1
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. (at 1.0 kHz)
•
High ripple rejection:
Overcurrent of output transistor can be restricted.
•
Built-in overcurrent protector:
SOT-23-5
•
Small package:
•
Lead-free products
*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
Package Name
SOT-23-5
Package
MP005-A
Drawing Code
Tape
MP005-A
Reel
MP005-A
Seiko Instruments Inc.
1
Rev.2.0
_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
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) under the Operation.
Seiko Instruments Inc.
3
Rev.2.0
_00
HIGH RIPPLE-REJECTION LOW DROPOUT CMOS VOLTAGE REGULATOR
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
NC
*1
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.
Seiko Instruments Inc.
5
51单片机
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