S1F78100Y2A Epson Electronics America, Inc., S1F78100Y2A Datasheet - Page 142

• Manufacturer Part Number: S1F78100Y2A
• Description: High Precision Voltage Regulators
• Manufacturer: Epson Electronics America, Inc.

PACKAGE MARKINGS
The markings on S1F79100Y series device packages
use the following abbreviations.
Note
The reflow furnace temperature profile requirements
must be satisfied during package reflow. Avoid solder-
ing on surface mount package (including SOT89) as it
causes a quick temperature change of package and a
device damage.
FUNCTIONAL DESCRIPTIONS
Basic Operation
The S1F79100Y series uses a 3-pin series regulator
feedback loop. An operational amplifier compares
V
with V
transistor gate bias to equalize the voltages and com-
pensate for fluctuations in V
The following equation shows the relationship between
V
V
S1F70000 Series
Technical Manual
Output voltage code
Voltage regulator code
REG
O
O
and V
= — — — — — V
V
I
R
from the voltage divider formed by R
REF
1
Parameter
R
+ R
REF
1
. The amplifier output adjusts the output
.
2
V
REF
REF
–
+
I
.
Code Description
B
D
P
N
R
V
R
REG
1
2
Negative
Positive
5 V
3 V
1
GND
V
and R
O
EPSON
2
,
Marking locations
Internal Circuits
Reference voltage generator
The offset structure used in all three transistors results
in a high breakdown voltage that ensures a stable refer-
ence voltage output over a wide range of input voltages.
V
SS
Voltage regulator
code
V
1
Enhancement
Depletion
Depletion
S1F79100Y Series
mode
mode
mode
V
REF
Output voltage
code
3–35