RN5RY221C [RICOH]
Switching Controller, Voltage-mode, 0.5A, CMOS, PDSO5, MINI, PLASTIC, SOT-23, 5 PIN;型号: | RN5RY221C |
厂家: | RICOH ELECTRONICS DEVICES DIVISION |
描述: | Switching Controller, Voltage-mode, 0.5A, CMOS, PDSO5, MINI, PLASTIC, SOT-23, 5 PIN 开关 光电二极管 |
文件: | 总13页 (文件大小:115K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
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
Low Standby Current
TYP. 3µA
TYP. 0.6µA
Low Temperature-Drift Coefficient of Output Voltage
TYP. ±50ppm / ˚C
±2.5%
...................................................................
High Accuracy Output Voltage
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
VOUT
CE
2
5
3
OSC
EXT
–
+
Output
Buffer
Vref
GND
1
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
↑ ↑ ↑
↑
a b c
d
Code
Contents
OUT
Designation of Output Voltage (V
)
a
b
OUT
V
can be designated within the range of 2.0 to 6.0V
1
Designation of Packing Type:
A: Taping
c
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.
Symbol
GND
VOUT
EXT
NC
Description
1
2
3
4
5
Ground Pin
Output Pin
External Transistor Drive Pin(CMOS Output)
No Connection
CE
Chip Enable Pin
3
RN5RY××1
ABSOLUTE MAXIMUM RATINGS
Unit
V
Symbol
VIN
Item
Ratings
+12
Input Voltage
VCE
CE Pin Input Voltage
EXT Pin Output Voltage
EXT Pin Output Current
Power Dissipation
–0.3 to VOUT+0.3
–0.3 to VOUT+0.3
±50
V
VEXT
IEXT
PD
V
mA
mW
˚C
150
Topt
Tstg
Tsolder
Operating Temperature
Storage temperature
–30 to +85
–55 to +125
260˚C, 10s
˚C
Lead Temperature (Soldering)
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
RN5RY××1
ELECTRICAL CHARACTERISTICS
• RN5RY301
Topt=25˚C
Symbol
VOUT
VIN
Item
Conditions
MIN.
TYP.
MAX.
3.075
10
Unit
V
Output Voltage
VIN=1.5V,IOUT=10mA
2.925
3.000
Input Voltage
V
µA
µA
µA
IDD1
Supply Current 1
EXT No load, VOUT=3.15V, Test circuits1
EXT No load, VOUT=2.85V, Test circuits1
VOUT=1.5V, Test circuits2
3
5
IDD2
Supply Current 2
25
50
Istandby
fosc
Standby Current
0.6
180
75
1.5
Maximum Oscillator Frequency
Oscillator Duty Cycle
Oscillator Start-Up Voltage
VOUT=2.85V, Test circuits3
kHZ
%
Duty
Vstart
VOUT=2.85V,
High side, Test circuits3
60
EXT
EXT No load, Test circuits4
0.7
0.8
V
Output Voltage
Temperature Coefficient
IOUT=10mA
–30˚C≤Topt≤85˚C
∆VOUT
∆Topt
±50
ppm/˚C
IEXTH
IEXTL
VCEH
VCEL
ICEH
ICEL
EXT “H” Output Current
EXT “L” Output Current
CE “H” Input Voltage
CE “L” Input Voltage
CE “H” Input Current
CE “L” Input Current
V
OUT=2.85V, VEXT=GND, Test circuits5
OUT=2.85V, VEXT=2.85V, Test circuits6
VOUT=2.85V, Test circuits4
VOUT=2.85V, Test circuits4
CE=3.0V, Test circuits7
–1.5
mA
mA
V
V
1.5
1.5
0.25
0.1
V
µA
µA
0
0
CE=GND, Test circuits8
–0.1
5
RN5RY××1
• RN5RY401
Topt=25˚C
Symbol
VOUT
VIN
Item
Conditions
MIN.
TYP.
MAX.
4.100
10
Unit
Output Voltage
VIN=2.0V, IOUT=10mA
3.900
4.000
V
Input Voltage
V
µA
µA
µA
IDD1
Supply Current 1
Supply Current 2
Standby Current
EXT No load, VOUT=4.2V, Test circuits1
EXT No load, VOUT=3.8V, Test circuits1
VOUT=2.0V, Test circuits2
3
5
IDD2
50
90
Istandby
fosc
0.6
180
75
1.5
Maximum Oscillator Frequency
Oscillator Duty Cycle
VOUT=3.8V, Test circuits3
kHZ
%
Duty
Vstart
V
OUT=3.8V,
High side, Test circuits3
60
EXT
-
Oscillator Start Up Voltage
EXT No load, Test circuits4
0.7
0.8
V
∆VOUT
∆Topt
Output Voltage
Temperature Coefficient
IOUT=10mA
–30˚C≤Topt≤85˚C
±50
ppm/˚C
IEXTH
IEXTL
VCEH
VCEL
ICEH
ICEL
EXT “H” Output Current
EXT “L” Output Current
CE “H” Input Voltage
CE “L” Input Voltage
CE “H” Input Current
CE “L” Input Current
V
OUT=3.8V, VEXT=GND, Test circuits5
–1.5
mA
mA
V
V
OUT=3.8V, VEXT=3.8V, Test circuits6
VOUT=3.8V, Test circuits4
VOUT=3.8V, Test circuits4
CE=4.0V, Test circuits7
CE=GND, Test circuits8
1.5
1.5
0.25
0.1
V
µA
µA
0
0
–0.1
6
RN5RY××1
• RN5RY501
Symbol
Topt=25˚C
Item
Conditions
MIN.
TYP.
MAX.
5.125
10
Unit
VOUT
VIN
Output Voltage
VIN=2.5V, IOUT=10mA
4.875
5.000
V
Input Voltage
V
µA
µA
µA
IDD1
IDD2
Supply Current 1
EXT No load, VOUT=5.25V, Test circuits1
EXT No load, VOUT=4.75V, Test circuits1
VOUT=2.5V, Test circuits2
3
5
Supply Current 2
90
150
1.5
Istandby
fosc
Standby Current
0.6
180
75
Maximum Oscillator Frequency
Oscillator Duty Cycle
Oscillator Start-Up Voltage
VOUT=4.75V, Test circuits3
kHZ
%
Duty
VOUT=4.75V,
High side, Test circuits3
60
EXT
Vstart
EXT No load, Test circuits4
0.7
0.8
V
∆VOUT
∆Topt
Output Voltage
Temperature Coefficient
IOUT=10mA
–30˚C≤Topt≤85˚C
±50
ppm/˚C
IEXTH
IEXTL
VCEH
VCEL
ICEH
ICEL
EXT “H” Output Current
EXT “L” Output Current
CE “H” Input Voltage
CE “L” Input Voltage
CE “H” Input Current
CE “L” Input Current
V
OUT=4.75V, VEXT=GND, Test circuits5
OUT=4.75V, VEXT=4.75V, Test circuits6
VOUT=4.75V, Test circuits4
VOUT=4.75V, Test circuits4
CE=5.0V, Test circuits7
–1.5
mA
mA
V
V
1.5
1.5
0.25
0.1
V
µA
µA
0
0
CE=GND, Test circuits8
–0.1
7
RN5RY××1
TEST CIRCUIT
A
GND
VOUT
EXT
CE
NC
GND
CE
NC
A
VOUT
EXT
Test Circuit 1
Test Circuit 2
GND
VOUT
EXT
CE
GND
CE
NC
VOUT
EXT
NC
Oscilloscope
Oscilloscope
Test Circuit 3
Test Circuit 4
GND
CE
NC
GND
VOUT
EXT
CE
NC
VOUT
EXT
Oscilloscope
Oscilloscope
Test Circuit 5
Test Circuit 6
A
GND
CE
NC
A
GND
CE
NC
VOUT
EXT
VOUT
EXT
Test Circuit 7
Test Circuit 8
8
RN5RY××1
TYPICAL CHARACTERISTICS
1) Output Voltage vs. Output Current
RN5RY301
L=68µH
RN5RY301
L=27µH
4.00
3.00
2.00
4.00
3.00
VIN=2.0V
VIN=2.0V
1.0V
200
1.5V
300
0.8V
1.0V
1.5V
0.8V
0.9V
0.9V
2.00
5.00
0
100
200
300
400
500
0
100
400
500
Output Current IOUT(mA)
Output Current IOUT(mA)
L=27µH
RN5RY401
L=68µH
RN5RY401
5.00
4.00
3.00
VIN=3.0V
VIN=3.0V
4.00
3.00
2.0V
1.0V
2.0V
1.0V
0.9V
0.8V
0.8V
0.9V
100
0
200
300
400
500
600
0
100
200
300
400
500
600
Output Current IOUT(mA)
Output Current IOUT(mA)
RN5RY501
L=27µH
RN5RY501
L=68µH
6.00
5.00
4.00
6.00
5.00
4.00
VIN=4.0V
VIN=4.0V
3.0V
1.0V
0.9V
1.0V
0.9V
2.0V
3.0V
2.0V
0.8V
0.8V
0
100 200 300 400 500 600 700
Output Current IOUT(mA)
0
100 200 300 400 500 600 700
Output Current IOUT(mA)
9
RN5RY××1
2) Efficiency vs. Output Current
RN5RY301
L=27µH
RN5RY301
L=68µH
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
VIN=2.0V
VIN=2.0V
1.0V
0.9V
1.5V
1.0V
1.5V
0.8V
0.8V 0.9V
0
100
200
300
400
500
0
100
200
300
400
500
Output Current IOUT(mA)
Output Current IOUT(mA)
RN5RY401
L=68µH
RN5RY401
L=27µH
VIN=3.0V
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
VIN=3.0V
2.0V
1.0V
0.9V
2.0V
1.0V
0.9V
0.8V
0.8V
0
100
200
300
400
500
600
0
100
200
300
400
500
600
Output Current IOUT(mA)
Output Current IOUT(mA)
RN5RY501
L=68µH
RN5RY501
L=27µH
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
VIN=4.0V
VIN=4.0V
3.0V
1.0V
0.9V
1.0V
0.9V
3.0V
2.0V
2.0V
0.8V
0.8V
0
100
200
300 400
500 600
700
0
100 200 300 400 500 600 700
Output Current IOUT(mA)
Output Current IOUT(mA)
10
RN5RY××1
3) Ripple Voltage vs. Output Current
RN5RY401
L=27µH
RN5RY301
L=27µH
400
300
200
350
1.5V
300
2.0V
1.0V
VIN=2.0V
250
VIN=3.0V
200
150
100
50
0.9V
0.8V
1.0V
0.9V
0.8V
100
0
0
200
Output Current IOUT(mA)
0
100
300
400
500
600
0
100
200
300
400
500
Output Current IOUT(mA)
RN5RY501
L=27µH
500
400
300
200
100
0
3.0V
2.0V
VIN=4.0V
1.0V
0.9V
0.8V
100 200
Output Current IOUT(mA)
0
300
400
500 600 700
11
RN5RY××1
TYPICAL APPLICATIONS
L1
D1
VIN
RN5RY××1
VOUT
VOUT
Cb
Rb
EXT
CE
GND
+
+
+
C2
C3
C1
Q1
Components : Inductor (L1)
Diode (D1)
: CD105
: D1FS4A (Schottky Type)
: 33µF (Tantalum Type)
: 47µF (Tantalum Type)
: 47µF (Tantalum Type)
: 2SD1628G
Capacitor (C1)
Capacitor (C2)
Capacitor (C3)
Transistor (Q1)
Base Resistor (Rb)
Base Capacitor (Cb)
: 220Ω
: 2200pF
APPLICATION HINTS
• A spike-shaped voltage higher than output voltage may be applied to the driver transistor. Therefore, care should be
paid regarding its absolute maximum ratings (VDS, VCF). We recommend to use a transistor having absolute maxi-
mum ratings of at least twice the set output voltage.
• We also recommend the use of an output capacitor with an allowable voltage which is at least 1.5 times the set out-
put voltage. This is because there may be the case where a spike-shaped voltage higher than the set output voltage
is generated.
Use capacitor with good high frequency characteristics such as tantalum capacitor.
• Choose such an inductor that a sufficiently small d.c. resistance and large allowable current, and hardly reaches
magnetic saturation.
• Use a diode of a Schottky type with high switching speed, and also take care of the rated current.
• Set external components as close as possible to the IC and minimize the current between the components and the
IC. In particular, make minimum connection with the output capacitor.
• Make sufficient grounding. A large current flows through GND Pin by switching. When the impedance of the GND
connection is high, the potential within the IC is varied by the switching current. This may result in unstable opera-
tion of the IC.
12
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