Epson Power Supply IC S1F70000 Technical Manual page 177

S1F76300 Series
Other Applications
Voltage booster
Combining an S1F76330M1B0 switching regulator
with an S1F76610C/M DC/DC converter and voltage
L
V
I1
GND
Potential levels are shown in the following figure.
S1F76330M1B0
V (5 V)
O
V (1.5 V)
I
GND (0 V)
4–32
D
V
SW
V
O
S1F76330M
PS
R
D
C C
G D
S1F76610C/M
V (5 V)
DD
V (0 V)
DD
V (–10 V)
O
regulator creates the voltage booster circuit shown in
the following figure.
1
+
C1
10 F
2
3
+
C2
10 F
4 S1F76610C/M
5
C
6
7
V = –5 V
I
Although the circuit appears to have two ON/OFF con-
trol points, PS on the S1F76330M1B0 and P
S 1 F 7 6 6 1 0 C / M , P S o n l y s h u t s d o w n t h e
S1F76330M1B0. The input voltage still reaches the
S1F76610C/M through L and D.
V = 1.5 V
I
PS
GND = 0 V
V
P
OFF
GND = 0 V
EPSON
14
13
R
OSC
1 M
12
11
10
9
8
C3
10 F
Boost Boost
ON
= 5V
I
Boost Boost
ON
P
OFF
V = –15 V
O
on the
OFF
OFF
OFF
S1F70000 Series
Technical Manual