S-1155 Series
www.sii-ic.com
© Seiko Instruments Inc., 2007-2014
HIGH RIPPLE-REJECTION LOW DROPOUT
HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
Rev.2.1
_00
The S-1155 Series, developed by using CMOS technology, is a positive voltage regulator with a super low dropout voltage,
high-accuracy output voltage and low current consumption.
The S-1155 Series provides the very low dropout voltage and the large output current due to the built-in transistor with low
on-resistance. The S-1155 Series includes an overcurrent protection circuit that prevents the load current from exceeding
the current capacitance of the output transistor, a thermal shutdown circuit that prevents damage due to overheating, and
an inrush current limit circuit to limit the excessive inrush current generated at power-on.
The ON/OFF circuit ensures longer battery life. Compared with the voltage regulators using the conventional CMOS
technology, a large variety of capacitors are available, including small ceramic capacitors
The small package SOT-89-5 realizes high-density mounting.
Features
•
Output voltage:
•
Input voltage:
•
Output voltage accuracy:
•
Dropout voltage:
•
Current consumption:
•
Output current:
•
Input and output capacitors:
•
Ripple rejection:
•
Built-in overcurrent protection circuit:
•
Built-in thermal shutdown circuit:
•
Built-in inrush current limit circuit:
•
Built-in ON/OFF circuit:
•
Operation temperature range:
•
Lead-free, Sn 100%, halogen-free
*2
1.0 V to 5.0 V, selectable in 0.05 V step
1.5 V to 5.5 V
±1.0%
(1.0 V to 1.45 V output product:
±15
mV)
70 mV typ. (3.0 V output product, I
OUT
= 200 mA)
During operation: 70
μA
typ., 90
μA
max. (3.0 V output product)
During power-off: 0.1
μA
typ., 1.0
μA
max.
Possible to output 500 mA (3.0 V output product, V
IN
≥
V
OUT(S)
+
1.0 V)
*1
A ceramic capacitor of 4.7
μF
or more can be used.
70 dB typ. (1.0 V output product, f = 1.0 kHz)
Limits overcurrent of output transistor.
Prevents damage caused by heat.
Limits excessive inrush current at power-on.
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 TV, notebook PC and home electric appliance
•
Constant-voltage power supply for portable equipment
Package
•
SOT-89-5
Seiko Instruments Inc.
1
Rev.2.1
_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.
name”
regarding the contents of product name, “2.
Package”
regarding the package drawings and “3.
name list”
regarding details of product name.
Product
Product
1.
Product name
S-1155
x
xx
-
U5T1
x
Environmental code
U: Lead-free (Sn 100%), halogen-free
G: Lead-free (for details, please contact our sales office)
Package abbreviation and packing specifications
U5T1: SOT-89-5, Tape
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 tape drawing.
If you request the product which has 0.05 step, contact our sales office.
Refer to “3.
ON/OFF pin”
in “
Operation”.
2.
Package
Drawing Code
Tape
UP005-A-C-SD
Package Name
SOT-89-5
Package
UP005-A-P-SD
Reel
UP005-A-R-SD
Seiko Instruments Inc.
3
Power technology
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