S1F78100Y2A Epson Electronics America, Inc., S1F78100Y2A Datasheet - Page 158

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

Timing diagram
PACKAGE MARKINGS
S1F76310, S1F76380 series device packages use the
following markings.
FUNCTIONAL DESCRIPTIONS
Basic Voltage Booster Operation
Tr1 switches ON and OFF at half the frequency of the
clock pulses from the built-in RC oscillator. When the
transistor is ON, the circuit stores energy in L. When it
is off, this energy flows through D to change C.
S1F70000 Series
Technical Manual
PWCR
GND
RST
V
V
I1
I1
7 6 3 1
L
Series number
First subcode character
Second subcode character
Code number
Tr1
D
C
t
pd
V
GND
O
EPSON
Measurement circuit
Internal Circuits
CR oscillator
The S1F76310, S1F76380 series use a built-in CR os-
cillator to drive the voltage booster circuit. The circuit
is supplied by V
and thus the drive frequency is set internally. To ensure
50% duty, this frequency is twice that used by the volt-
age booster circuit.
When PS is Low, the oscillator is disabled and the chip
is in standby mode.
PS
R
C
V
O
R
PWCR
I1
. All circuit components are on-chip
100 k
C
V
S1F76300 Series
O
RST
4–13