S1F78100Y2A Epson Electronics America, Inc., S1F78100Y2A Datasheet - Page 65

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

S1F76540 Series
Table 2.4 AC characteristics
FUNCTIONAL DESCRIPTIONS
Clock Generator Circuit
As the S1F76540 has a built-in clock generator circuit,
no more parts are required for voltage boost control.
The clock frequency changes according to the FC pin
voltage level as defined on Table 2.5. Low Output mode
or High Output mode is selectable. This allows fre-
quency selection according to the used capacitance and
Table 2.5 FC pin setup
*1 See the DC characteristics table for current consumption.
*2 See Section Page 2-32 for the output ripple definition and calculation.
2–22
Internal clock frequency 1
Internal clock frequency 2
High (V
Low (V
FC pin
Parameter
DD
I
)
)
High Output 16.0 kHz (Typ.) I
Low Output
Mode
Clock frequency
Symbol
4.0 kHz (Typ.)
f
f
CL1
CL2
FC = V
P
P
Pin used: C1P
FC = V
P
P
Pin used: C1P
OFF1
OFF2
OFF1
OFF2
= V
= V
= V
= V
consumption
DD
I
OP
EPSON
,
,
Current
I
I
DD
I
DD
OP
Conditions
Approx. 4 V
(*1)
load current as the boost output impedance changes de-
pending on the clock frequency and external booster ca-
pacitance. However, the High Output mode has the
current consumption approximately four times larger
than the Low Output mode.
Output ripple
Ta = 25 C
Ta = –30 C
to +85 C
Ta = 25 C
Ta = –30 C
to +85 C
RI
V
RR
Approx. 1/4 See Figure A1. See Figure A1.
Characteristics
(*2)
See Figure A1. See Figure A1.
impedance
Min.
12.0
3.0
2.0
8.0
Output
V
DD
unless otherwise noted
= 0 V and V
Typ. Max. Unit
16.0
16.0
4.0
4.0
Capacitance
Technical Manual
S1F70000 Series
24.0
28.0
6.0
7.0
I
= –5.0 V
kHz
kHz
kHz
kHz