S1F78101Y Epson Electronics America, Inc., S1F78101Y Datasheet - Page 7

• Manufacturer Part Number: S1F78101Y
• Description: Positive Voltage Regulator
• Manufacturer: Epson Electronics America, Inc.

5. FUNCTIONAL DESCRIPTION
transistor between input and output pins, as shown below. It is designed to output stable voltage (V
independent of input voltage by feeding the voltage (V
connected between the output (V
reference voltage (V
internally fixed, which is obtained from the formula below.
from flowing due to causes such as the load capacity connected to the output pin at power-on.
S1F78101Y Series Technical Manual (Rev.1.4)
The S1F78101Y3 series is a fixed-level, positive output voltage series regulator using an output control MOS
This product has an internal inrush current limiter as a protective function.
The inrush current limiter function is designed to control power current to prevent excessive power current
(2pin)
(1pin)
V
V
DD
SS
REF
) to control the gate voltage of the output control transistor. The output voltage is
(Output control transistor)
OUT
) and V
(Operational amplifier)
V
SS
OUT
pins back to the operational amplifier and comparing it with the
=
R1
EPSON
R1
+
R2
REG
・V
) divided by internal resistances (R1 and R2)
REF
V
V
REG
REF
5. FUNCTIONAL DESCRIPTION
R2
R1
(3pin)
V
OUT
O
)
3