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PDF RN5RK301A-TR Data sheet ( Hoja de datos )
| Número de pieza | RN5RK301A-TR | |
| Descripción | SOT-23-5 VFM STEP-UP DC/DC CONVERTER | |
| Fabricantes | RICOH electronics devices division | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RN5RK301A-TR (archivo pdf) en la parte inferior de esta página. Total 23 Páginas | ||
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RN5RK SERIES
VFM STEP-UP DC/DC CONVERTER
NO.EA-045-111124
OUTLINE
The RN5RKxx1A/xx1B/xx2A Series are CMOS-based VFM (Chopper) Step-up DC/DC converter ICs with ultra
low supply current and high output voltage accuracy.
Each of the RN5RKxx1A/xx1B consists of an oscillator, a VFM control circuit, a driver transistor to have low
ON resistance (Lx switch), a reference voltage unit, a high speed comparator, resistors for voltage detection, an
Lx switch protection circuit and an internal chip enable circuit. A low ripple, high efficiency step-up DC/DC
converter can be composed of this RN5RKxx1A/xx1B with only three external components: an inductor, a diode
and a capacitor.
The RN5RKxx2A uses the same chip as what is employed in the RN5RKxx1A/1B IC and has a drive pin (EXT)
for an external transistor instead of an Lx pin. As it is possible to load a large output current with a power
transistor which has a low saturation voltage, RN5RKxx2A IC is recommendable to users who need an output
current as large as between several tens mA and several hundreds mA.
Using the chip enable function, it is possible to make the supply current on standby minimized.
Since the package for these ICs is SOT-23-5, high density mounting of the ICs on board is possible.
FEATURES
• Small Number of External Components .............................. Only an inductor, a diode and a capacitor
(RN5RKxx1A/xx1B)
• Standby Current ................................................................... Typ. 0μA
• Low Temperature-Drift Coefficient of Output Voltage........... Typ. ±100ppm/°C
• Output Voltage Range.......................................................... 2.0V to 5.5V
• Two Kinds of Duty Ratio....................................................... 77% (xx1A, xx2A)/ 55% (xx1B)
• High Output Voltage Accuracy ............................................. ±2.5%
• Small Packages ................................................................. SOT-23-5
• High Efficiency ..................................................................... Typ. 85% (RN5RK301B, VIN=2V, IOUT=10mA)
• Low Ripple and Low Noise
• Including a Driver Transistor with Low ON Resistance........ Only RN5RKxx1A/xx1B
• Low Start-up Voltage............................................................ Max.0.9V
APPLICATIONS
• Power source for battery-powered equipment.
• Power source for cameras, camcorders, VCRs, and hand-held communication equipment.
• Power source for those appliances which require higher cell voltage than that of batteries.
1
1 page  
RN5RK
ELECTRICAL CHARACTERISTICS
• RN5RKxx1A/xx1B
Symbol
VOUT
VIN
ΔVOUT/
ΔTopt
Vstart
ΔVstart/
ΔTopt
Vhold
Vhold
IDD2
Istandby
ILXleak
fosc
Δfosc/
ΔTopt
Maxduty
VLXlim
VCEH
VCEL
ICEH
ICEL
IDD1
Item
Conditions
Output Voltage
VIN=Set VOUT×0.6, IOUT=1mA
Input Voltage
Output Voltage
Temperature Coefficient
Start-Up Voltage
Start-Up Voltage
Temperature Coefficient
Hold-on Voltage (xx1A)
Hold-on Voltage (xx1B)
−40°C <= Topt <= 85°C
VIN=0V→2V*1
-40°C <= Topt <= 85°C
VIN=0V→2V*1
VIN=2V→0V*1
VIN=2V→0V*1
Supply Current2
VOUT=VCE=Set VOUT+0.5V
Standby Current
VOUT=6V, VCE=0V
Lx Leakage Current
VOUT=VLX=8V
Maximum Oscillator
Frequency
VOUT=VCE=Set VOUT×0.96
Frequency Temperature
Coefficient
-40°C <= Topt <= 85°C
Oscillator Duty Cycle (xx1A) VOUT=VCE=Set VOUT×0.96,
Oscillator Duty Cycle (xx1B) ON (VLX "L" side)
VLX Voltage Limit
VOUT=VCE=1.95V, Lx Switch ON
CE "H" Input Voltage
CE "L" Input Voltage
VOUT=VCE=Set VOUT×0.96,
Judgment is made by the Lx
waveform
CE "H" Input Current
VOUT=6.0V, VCE=6.0V
CE "L" Input Current
VOUT=6.0V, VCE=0V
2.0V <= Set VOUT <= 2.4V
2.5V <= Set VOUT <= 2.9V
Supply Current1 *2
3.0V <= Set VOUT <= 3.4V
3.5V <= Set VOUT <= 3.9V
4.0V <= Set VOUT <= 4.4V
4.5V <= Set VOUT <= 4.9V
5.0V <= Set VOUT <= 5.5V
Topt=25°C
Min. Typ.
×0.975
±100
0.75
-1.6
0.7
0.9
2
Max.
×1.025
8.0
0.90
5
0.5
1
Unit
V
V
ppm
/°C
V
mV/
°C
V
V
μA
μA
μA
80 100 120 kHz
0.41
kHz/
°C
70 77 85 %
47 55 63 %
0.4 0.6 0.8
V
0.9 V
0.3 V
-0.5 0
0.5 μA
-0.5 0
0.5 μA
25 50 μA
30 55
35 60
40 65 μA
45 75
50 80
55 90
5
5 Page 
TYPICAL CHARACTERISTICS
• RN5RKxx1A/B
1) Output Voltage vs. Output Current (Topt=25°C)
RN5RK301A
L=100μH
3.5
3.0
2.0V
2.5
1.0V 1.3V
2.0
1.5 VIN=0.9V
1.0
1.5V
0.5
0.0
0
20 40 60 80 100 120 140 160
Output Current IOUT(mA)
RN5RK301B
L=100μH
3.5
3.0
2.5
1.3V
2.0
VIN=1.0V
1.5
1.5V
2.0V
1.0
0.5
0.0
0
10 20 30 40
Output Current IOUT(mA)
50
RN5RK501A
6
5
2.0V
4 1.5V
VIN=0.9V
3
L=100μH
4.0V
3.0V
2
1
0
0 50 100 150 200
Output Current IOUT(mA)
RN5RK
RN5RK301A
L=220μH
3.5
3.0
2.5
1.0V
2.0
VIN=0.9V
1.5
1.5V
1.3V
2.0V
1.0
0.5
0.0
0
20 40 60 80 100 120 140 160
Output Current IOUT(mA)
RN5RK301B
L=220μH
3.5
3.0
1.3V
2.5
1.5V
2.0V
2.0 VIN=1.0V
1.5
1.0
0.5
0.0
0
10 20 30 40
Output Current IOUT(mA)
50
RN5RK501A
L=220μH
6
4.0V
5
4 1.5V
VIN=0.9V
3
2.0V
3.0V
2
1
0
0 50 100 150 200
Output Current IOUT(mA)
11
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet RN5RK301A-TR.PDF ] | |
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