9. REFERENCE: EXTERNAL CONNECTION EXAMPLES
22
EPSON
S1F76540M0C Series Technical Manual
(Rev.1.1)
9.4 Quadruple Boosting
Run only the booster, perform quadruple boosting in the negative direction for input voltage VI, and generate
the voltage in the VO pin.
In this case, the regulator is not used, so the voltage containing ripple components is generated in the VO pin.
Figure 9.4 shows a connection example.
Figure 9.4 Quadruple boosting connection example
Figure 9.4 Setting conditions
Internal clock
: ON (Low output mode)
Booster
: ON
Regulator
: OFF
Power-off method
Set the POFF2X pin to level LOW (VI); all circuits will be turned off.
About ripple voltage
The output voltage to be generated in the VO pin is not stabilized; therefore, it contains the ripple
components shown in Figure 9.5. The ripple voltage VRP increases depending on the load current, and the
approximate value can be obtained in expression (9.1).
VO waveform
Figure 9.5 Ripple waveform chart
IO
:
Load current (A)
fCL
:
Clock frequency (Hz)
RCO
:
Serial equivalent resistance (
Ω
) of output capacitor CO
Other setting conditions
(1) When using the high output mode
Connect the FC pin to VI.
VRP
2
・
fCL
・
CO
VRP
＝
IO
+ IO
×
RCO
Expression (9.1)
CO
+
V
DD
VO
1
VRI
V
REG
RV
V
DD
FC
TC1
TC2
C2P
C2N
C3N
C1N
C1P
VI
POFF1X
POFF2X
2
3
4
5
6
7
8
10
9
11
12
13
14
15
16
1
C2
+
C3
+
C1
+
CI
+
VI
VO
