S1F76540MOC Epson Electronics America, Inc., S1F76540MOC Datasheet - Page 7

• Manufacturer Part Number: S1F76540MOC
• Description: Charge Pump Type Dc/dc Converter
• Manufacturer: Epson Electronics America, Inc.

5. FUNCTIONAL DESCRIPTION
5. FUNCTIONAL DESCRIPTION
5.1 Clock Generator
output mode or high output mode. This results in you being able to select the clock frequency based on the load
current and value of the capacitor to be used because the boosting output impedance varies depending on the
clock frequency and the values of the external capacitors for boosting.
4
S1F76540, which contains a clock generator for boosting control, requires no external parts.
The clock frequency varies depending on the FC pin level (see Table 5.1), and you can select either the low
FC pin
H(V
(Note 1) For the consumption current value, see 7.1 DC Characteristics Table.
(Note 2) For information about how to define and roughly estimate the output ripple value, see 9.4.
L(VI)
DD
)
High output
Low output
Fig.5.1 Capacitor capacity value - output impedance characteristics diagram
Mode
name
550
500
450
400
350
300
250
200
150
frequency
（Typ.）
（Typ.）
16.0kHz
4.0kHz
Clock
1
Quadruple boosting Ta=25°C Io=10mA
Table 5.1 FC pin settings
VI=-3V FC=Low
Consumption
IOP (Note 1)
IOP (Note 1)
VI=-5V FC=Low
current
(Tantalum capacitor)
C
EPSON
VI=-3V FC=High
I
=C
C[µF]
1
=C
10
2
=C
VI=-5V FC=High
Selection judgment characteristics
3
=C
Output ripple
VRP (Note 2)
VRP (Note 2)
O
S1F76540M0C Series Technical Manual (Rev.1.0)
100
impedance
See Fig.5.1
See Fig.5.1
Output
See Fig.5.1
See Fig.5.1
Capacitor
capacity