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S1F76540 Series
V
=
RP
where,
I
: Load current (A)
O
f
: Clock frequency (Hz)
CL
R
: Serial equivalent resistance ( ) of output capacitor C
COUT
Application in other setup conditions
1 When used in the High Output mode
Connect the FC pin to the V
Parallel Connection (for Increased Boosting)
The parallel connection is useful for reduction of
booster output impedance or reduction of ripple volt-
age. In the parallel connection of "n" lines, the booster
output impedance can be reduced to approximately "1/
n". Only the smoothing capacitor (C
put can be used commonly in the parallel connection.
When using the regulator, use only one of "n"
+
C
O
V
DD
+
C
I
V
I
2–32
I
O
+ I
• R
O
COUT
2 • f
• C
CL
O
Figure 2.10 Ripple waveforms
pin.
I
) for booster out-
O
1
16
V
C2P
O
2
15
V
C2N
RI
3
14
V
C3N
REG
C1
4
13
RV
C1N
5
12
V
C1P
DD
6
11
FC
V
I
7
10
TC1
P
OFF1
8
9
TC2
P
OFF2
Figure 2.11 Parallel connection example
O
S1F76540 chips which are in parallel connection. (If
multiple regulators are operated in parallel mode, the
reactive current consumption occurs.) Figure 2.11
gives a wiring example of 4-time booster and regulator
where two S1F76540s are parallelly connected.
+
C
REG
+
C2
R1
R2
C3
+
+
EPSON
V
RP
• • • • Equation (4)
V
REG
1
16
V
C2P
O
2
15
V
C2N
RI
3
14
V
C3N
REG
C1
4
13
RV
C1N
5
12
V
C1P
DD
6
11
FC
V
I
7
10
TC1
P
OFF1
8
9
TC2
P
OFF2
S1F70000 Series
Technical Manual
+
C2
C3
+
+
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