S1F78100Y2A Epson Electronics America, Inc., S1F78100Y2A Datasheet - Page 75

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

S1F76540 Series
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”
2–32
Application in other setup conditions
1 When used in the High Output mode
Connect the FC pin to the V
where,
I
f
R
V
V
O
CL
DD
I
COUT
V
: Load current (A)
: Clock frequency (Hz)
: Serial equivalent resistance ( ) of output capacitor C
C
C
RP
+
I
+
O
=
2 • f
1
2
3
4
5
6
7
8
V
V
V
RV
V
FC
TC1
TC2
CL
I
O
RI
REG
DD
O
• C
Figure 2.11 Parallel connection example
I
pin.
O
O
P
P
) for booster out-
C2N
C3N
C1N
C2P
C1P
OFF1
OFF2
Figure 2.10 Ripple waveforms
+ I
V
I
O
16
15
14
13
12
11
10
9
• R
C1
COUT
C2
+
+
EPSON
C3
+
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.
R1
+
C
R2
REG
O
V
REG
1
2
3
4
5
6
7
8
V
V
V
RV
V
FC
TC1
TC2
• • • • Equation (4)
O
RI
REG
DD
V
RP
P
P
C2N
C3N
C1N
C2P
C1P
OFF1
OFF2
V
I
16
15
14
13
12
11
10
9
Technical Manual
C1
S1F70000 Series
+
C2
+
C3
+