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參數(shù)資料
| 型號： | RN5RK521A-TL-FB |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.5 A SWITCHING REGULATOR, 120 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | MINI-MOLD, SC-74A, SOT-23, 5 PIN |
| 文件頁數(shù)： | 1/23頁 |
| 文件大小： | 445K |
| 代理商： | RN5RK521A-TL-FB |
RN5RK SERIES
VFM STEP-UP DC/DC CONVERTER
NO.EA-045-0602
1
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 (Mini-mold), 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. 0A
High Output Voltage Accuracy .............................................±2.5%
Low Ripple and Low Noise
Low Start-up Voltage............................................................ Max.0.9V
High Efficiency ..................................................................... Typ. 80%
Including a Driver Transistor with Low ON Resistance........ Only RN5RKxx1A/xx1B
Two Kinds of Duty Ratio....................................................... 77% (xx1A, xx2A)/ 55% (xx1B)
Output Voltage Range.......................................................... 2.0V to 5.5V
Low Temperature-Drift Coefficient of Output Voltage........... Typ. ±100ppm/°C
Small Packages ................................................................. SOT-23-5 (Mini-Mold)
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.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| RN5RK521A-TR | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:SOT-23-5 VFM STEP-UP DC/DC CONVERTER |
| RN5RK521B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Mode SMPS Controller |
| RN5RK521B-TL | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:SOT-23-5 VFM STEP-UP DC/DC CONVERTER |
| RN5RK521B-TR | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:SOT-23-5 VFM STEP-UP DC/DC CONVERTER |
| RN5RK522A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Mode SMPS Controller |
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