VFM STEP-UP DC/DC
CONVERTER CONTROLLER
RN5RY
××
1 SERIES
APPLICATION MANUAL
NO.EA-030-0006
VFM STEP-UP DC/DC
CONVERTER CONTROLLER
RN5RY
××
1 SERIES
OUTLINE
The RN5RY
××
1 Series are VFM Control ICs for step-up DC/DC converter with an external driver transistor
featuring high output voltage accuracy and low supply current by CMOS process. Each of the RN5RY
××
1 Series
ICs consists of a voltage reference unit, an error amplifier, an oscillator, a VFM control circuit and feed back resis-
tors. A low ripple, high efficiency step-up DC/DC converter can be composed of the RN5RY
××
1 Series with only
an inductor, a diode, a capacitor, and a drive transistor.
Since the package for these ICs are SOT-23-5( Mini-mold)package, high density mounting of the ICs on boards
is possible.
FEATURES
•
Low Supply Current ..................................................................................TYP. 3µA
•
Low Standby Current ..................................................................................TYP. 0.6µA
•
Low Temperature-Drift Coefficient of Output Voltage ...........................TYP. ±50ppm / ˚C
•
High Accuracy Output Voltage ...................................................................±2.5%
•
Low Oscillation Start-up Voltage ...............................................................MAX. 0.8V
•
Small Package ............................................................................................. SOT-23-5(Mini-Mold)
APPLICATIONS
•
Power source for battery-powered instruments.
•
Power source for cameras, VCRs, camcorders, pagers, and other hand-held communication instruments.
BLOCK DIAGRAM
CE
5
OSC
V
OUT
2
EXT
3
Output
Buffer
–
+
Vref
1
GND
1
RN5RY
× ×
1
SELECTION GUIDE
In the RN5RY
××
1 Series, the output voltage, the version and the taping type for the ICs can be selected at
the user's request. The selection can be made by designating the part number as shown below :
RN5RY
××××
–
××
←
Part Number
}
}
↑
d
↑ ↑↑
a bc
Code
Contents
a
Designation of Output Voltage (V
OUT
)
V
OUT
can be designated within the range of 2.0 to 6.0V
1
b
Designation of Packing Type:
c
A: Taping
C: Antistatic bag for samples
Designation of Taping Type:
Ex. SOT-23-5: TR, TL
(refer to Taping Specification)
“TR” is prescribed as a standard
d
For example, the product with Output Voltage 2.0V, Taping Type TR, is designated by Part Number
RN5RY201A–TR.
2
RN5RY
× ×
1
PIN CONFIGURATION
•
SOT-23-5
5
4
(mark side)
1
2
3
PIN DESCRIPTION
Pin No.
1
2
3
4
5
Symbol
Description
GND
V
OUT
EXT
NC
CE
Ground Pin
Output Pin
External Transistor Drive Pin (CMOS Output)
No Connection
Chip Enable Pin
3
RN5RY
× ×
1
ABSOLUTE MAXIMUM RATINGS
Symbol
Item
Ratings
Unit
V
IN
V
CE
V
EXT
I
EXT
P
D
Topt
Tstg
Tsolder
Input Voltage
CE Pin Input Voltage
EXT Pin Output Voltage
EXT Pin Output Current
Power Dissipation
Operating Temperature
Storage temperature
Lead Temperature (Soldering)
+12
–0.3 to V
OUT
+0.3
–0.3 to V
OUT
+0.3
±50
150
– 30 to +85
– 55 to +125
260˚C, 10s
V
V
V
mA
mW
˚C
˚C
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum ratings are threshold limit values that must not be exceeded even for an instant under any
conditions. Moreover, such values for any two items must not be reached simultaneously. Operation above
these absolute maximum ratings may cause degradation or permanent damage to the device. These are stress
ratings only and do not necessarily imply functional operation below these limits.
4
