S1F76540MOC Epson Electronics America, Inc., S1F76540MOC Datasheet - Page 25

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

9. REFERENCE: EXTERNAL CONNECTION EXAMPLES
9.4 Quadruple Boosting
the voltage in the VO pin.
22
Run only the booster, perform quadruple boosting in the negative direction for input voltage VI, and generate
In this case, the regulator is not used, so the voltage containing ripple components is generated in the VO pin.
Fig.9.4 shows a connection example.
components shown in Fig.9.5. The ripple voltage VRP increases depending on the load current, and the
approximate value can be obtained in expression (9.1).
Fig.9.4 Setting conditions
Power-off method
About ripple voltage
Other setting conditions
Set the POFF2X pin to level LOW (VI); all circuits will be turned off.
The output voltage to be generated in the VO pin is not stabilized; therefore, it contains the ripple
When using the high output mode
Connect the FC pin to VI.
Internal clock :
Booster
Regulator
VO
VO waveform
V
DD
IO
fCL
RCO
VI
VRP＝
:
:
Fig.9.4 Quadruple boosting connection example
ON (Low output mode)
ON
OFF
2・fCL・CO
:
:
:
CI
+
+
IO
Load current (A)
Clock frequency (Hz)
Serial equivalent resistance (Ω) of output capacitor CO
Fig.9.5 Ripple waveform chart
CO
+
EPSON
1
2
3
4
5
6
7
8
1
IO × RCO
VO
VRI
V
RV
V
FC
TC1
TC2
REG
DD
S1F76540M0C Series Technical Manual (Rev.1.0)
POFF1X
POFF2X
C2N
C3N
C1N
C2P
C1P
VI
16
15
14
13
12
11
10
Expression (9.1)
9
C2
C1
+
+
VRP
C3
+