Rev.1.1
_00
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT
CMOS VOLTAGE REGULATOR
S-1155 Series
The S-1155 Series, developed based on CMOS technology, is a positive
voltage regulator with a super low dropout voltage, high output voltage
accuracy, and low current consumption.
The S-1155 Series provides the very small dropout voltage and the large
output current due to the built-in transistor with low on-resistance. The
overcurrent protector prevents the load current from exceeding the
capacitance of output transistor. The thermal shutdown circuit prevents
damage caused by heat, the rush current control circuit limits the
excessive rush current during start-up.
The ON/OFF circuit ensures longer battery life. Various capacitors, also
small ceramic capacitors, can be used for this IC more than for the
conventional regulator ICs which have CMOS technology.
The small package SOT-89-5 enables high-density mounting.
Features
•
Output voltage :
•
Low equivalent series resistance capacitor :
•
Input voltage :
•
High-accuracy output voltage :
•
Low dropout voltage :
•
Low current consumption :
1.0 to 5.0 V, selectable in 0.05 V step.
Ceramic capacitor of 4.7
µF
or more can be used as the
I/O capacitor.
1.5 to 5.5 V
±1.0%
(1.0 to 1.45 V output product :
±15
mV)
70 mV typ. (3.0 V output product, at I
OUT
= 200 mA)
During operation : 70
µA
typ., 90
µA
max. (3.0 V output
product)
During shutdown : 0.1
µA
typ., 1.0
µA
max.
500 mA (3.0 V output product, at V
IN
≥
V
OUT(S)
+
1.0 V)
*1
70 dB typ. (at 1.0 kHz, V
OUT
= 1.0 V)
limits overcurrent of output transistor
prevents damage caused by heat
limits excessive rush current during start-up
Longer battery life
SOT-89-5
•
Output current :
•
High ripple rejection :
•
Built-in overcurrent protection circuit :
•
Built-in thermal shutdown circuit :
•
Built-in rush current control circuit :
•
Built-in power on/off circuit :
•
Small package :
•
Lead-free product
*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 TV, notebook PCs and home electric appliances
•
Constant-voltage power supply for portable equipment
Packages
Package Name
SOT-89-5
Package
UP005-A
Drawing Code
Tape
UP005-A
Reel
UP005-A
Seiko Instruments Inc.
1
Rev.1.1
_00
HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1155 Series
Product Name Structure
Users can select the product type, output voltage, and package type for the S-1155 Series. Refer to “1.
Product
Name”
regarding the contents of product name, “2.
Product Name List”
regarding details of product name.
1.
Product Name
S-1155
x
xx
-
U5T1
G
Package name (abbreviation) and packing specifications
U5T1 : SOT-89-5, Tape
Value of output voltage
10 to 50
(e.g., when the output voltage is 1.0 V, it is expressed as 10.)
Product type
*3
*2
*1
A : ON/OFF pin negative logic
B : ON/OFF pin positive logic
*1.
*2.
*3.
Refer to the taping specifications.
If you request the product which has 0.05 step, contact our sales office.
Refer to “3.
Shutdown pin (ON/OFF pin)”
in “
Operation”.
Seiko Instruments Inc.
3
PCB Design
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