RE5RE20AA Ricoh Corporation, RE5RE20AA Datasheet - Page 19

• Manufacturer Part Number: RE5RE20AA
• Description: Voltage Regulator For Middle Output Current
• Manufacturer: Ricoh Corporation

18
R 5RE
APPLICATION CIRCUITS
• VOLTAGE BOOST CIRCUIT
• DUAL POWER SUPPLY CIRCUIT
TYPICAL APPLICATION
GND
V
IN
GND
V
V
IN
IN
C1
C1
C2
V
+
+
V
V
+
V
IN
IN
IN
IN
IC1
R 5RE20A
IC2
R 5RE30A
SERIES
SERIES
R 5RE
R 5RE
GND
GND
GND
GND
I
SS
V
V
V
C3
V
C1
OUT
OUT
OUT
OUT
+
+
+
+
C2
C2
I
SS
R1
R2
GND
D
R
GND
V
OUT
GND
V
V
OUT
OUT
5V
3V
V
1
2
OUT
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 R 5RE
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 R 5RE 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 R 5RE Series is so
Furthermore, since R 5RE 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 R 5RE 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