RE5RE Ricoh Corporation, RE5RE Datasheet - Page 18

• Manufacturer Part Number: RE5RE
• Manufacturer: Ricoh Corporation

18
APPLICATION CIRCUITS
• VOLTAGE BOOST CIRCUIT
• DUAL POWER SUPPLY CIRCUIT
Rx5RE
TYPICAL APPLICATION
V
GND
GND
IN
V
V
IN
C1
IN
C2
V
+
IN
C1
V
+
V
IN
IN
+
V
SERIES
Rx5RE
IN
IC1
IC2
Rx5RE20A
Rx5RE30A
GND
I
SS
SERIES
GND
GND
Rx5RE
V
GND
OUT
V
V
C3
C1
OUT
OUT
+
C2
+
V
+
OUT
I
SS
+
R1
R2
C2
GND
D
R
GND
V
V
GND
V
OUT
OUT
5V
3V
V
OUT
OUT
1
2
without using capacitors C1 and C2. However, when the
wire connected to V
noise can be reduced by using capacitor C2.
0.1µF to 2.0µF between input/output pins and GND pin
with minimum wiring.
ing formula :
small that the resistances of R1 and R2 can be set as
large as several hundreds kΩ and therefore the sup-
ply current of “Voltage Boost Circuit” itself can be
reduced.
a constant voltage, the supply current of “Voltage
Boost Circuit” is not substantially affected by the
input voltage.
ply circuit can be constructed by using two Rx5RE
Series.
circuit with an output of 3V and an output of 5V.
When the minimum output current of IC2 is larger
than I
a protection diode for the case where V
becomes larger than V
*
In Rx5RE Series, a constant voltage can be obtained
Insert capacitors C1 and C2 with the capacitance of
The output voltage can be obtained by the follow-
Since the quiescent current of Rx5RE Series is so
Furthermore, since Rx5RE Series are operated by
As shown in the circuit diagram, a dual power sup-
This circuit diagram shows a dual power supply
1) Vreg : Set Output Voltage of Rx5RE Series.
V
SS
OUT
of IC1, resistor R is unnecessary. Diode D is
=Vreg · (1+R2/R1) + I
*
1
IN
is long, use capacitor C1. Output
OUT
1.
SS
· R2
OUT
2