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RN5RKXX1A Schematic ( PDF Datasheet ) - RICOH electronics devices division

Teilenummer RN5RKXX1A
Beschreibung SOT-23-5 VFM STEP-UP DC/DC CONVERTER
Hersteller RICOH electronics devices division
Logo RICOH electronics devices division Logo 




Gesamt 23 Seiten
RN5RKXX1A Datasheet, Funktion
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






RN5RKXX1A Datasheet, Funktion
RN5RK
Symbol
Item
ILX Lx Switching Current
Conditions
2.0V <= Set VOUT <= 2.4V, VLX=0.4V
2.5V <= Set VOUT <= 2.9V, VLX=0.4V
3.0V <= Set VOUT <= 3.4V, VLX=0.4V
3.5V <= Set VOUT <= 3.9V, VLX=0.4V
4.0V <= Set VOUT <= 4.4V, VLX=0.4V
4.5V <= Set VOUT <= 4.9V, VLX=0.4V
5.0V <= Set VOUT <= 5.5V, VLX=0.4V
Min.
80
100
120
140
160
180
200
Typ.
Max.
Unit
mA
*1)Condition: An Output load resistor RL is connected between VOUT and GND.
Note that the resistor RL has a resistance which makes an output current 1mA after step-up operation.
*2)The Supply Current 1 (IDD1) for IC itself is measured when the internal oscillator works continuously.
If the oscillator works intermittently, the supply current becomes smaller than the value which is written on
the above table.
RECOMMENDED OPERATING CONDITIONS (ELECTRICAL CHARACTERISTICS)
All of electronic equipment should be designed that the mounted semiconductor devices operate within the
recommended operating conditions. The semiconductor devices cannot operate normally over the
recommended operating conditions, even if when they are used over such conditions by momentary
electronic noise or surge. And the semiconductor devices may receive serious damage when they continue
to operate over the recommended operating conditions.
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6 Page









RN5RKXX1A pdf, datenblatt
RN5RK
RN5RK501B
6
5
4 2.0V
3
VIN=1.5V
2
2.5V
L=100μH
4.0V
3.0V
1
0
0 50 100 150 200
Output Current IOUT(mA)
2) Efficiency vs. Output Current (Topt=25°C)
RN5RK301A
L=100μH
100
90
80
70
2.0V
60
1.0V
1.5V
50 VIN=0.9V
1.3V
40
0 20 40 60 80 100 120 140 160
Output Current IOUT(mA)
RN5RK301B
L=100μH
100
90
80
1.3V 1.5V
70 VIN=1.0V
2.0V
60
50
40
0 10 20 30 40 50
Output Current IOUT(mA)
RN5RK501B
6
5
4 2.0V
VIN=1.5V
3
2.5V
L=220μH
4.0V
3.0V
2
1
0
0 50 100 150 200
Output Current IOUT(mA)
RN5RK301A
L=220μH
100
90
80
70
60
1.0V
50
1.5V
2.0V
40 VIN=0.9V1.3V
0 20 40 60 80 100 120 140 160
Output Current IOUT(mA)
RN5RK301B
L=220μH
100
90
80
1.3V
70
VIN=1.0V
60
1.5V
2.0V
50
0 10 20 30 40 50
Output Current IOUT(mA)
12

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