參數(shù)資料
型號(hào)： RH5RI302B-T2
廠商： RICOH COMPANY LTD
元件分類(lèi)： 穩(wěn)壓器
英文描述： VFM STEP-UP DC/DC CONVERTER
中文描述： 0.05 A SWITCHING CONTROLLER, 120 kHz SWITCHING FREQ-MAX, PSSO3
封裝： SOT-89, 3 PIN
文件頁(yè)數(shù)： 2/24頁(yè)
文件大?。?/td> 179K
代理商： RH5RI302B-T2
VFM STEP-UP DC/DC CONVERTER
1
RH5RI
××
1B/
××
2B/
××
3B SERIES
OUTLINE
The RH5RI
××
1B/
××
2B/
××
3B Series are VFM (Chopper) Step-up DC/DC converter ICs with ultra low supply
current by CMOS process.
The RH5RI
××
1B IC consists of an oscillator, a VFM control circuit, a driver transistor (Lx switch), a reference
voltage unit, an error amplifier, resistors for voltage detection, and an Lx switch protection circuit. A low ripple,
high efficiency step-up DC/DC converter can be constructed of this RH5RI
××
1B IC with only three external com-
ponents, that is, an inductor, a diode and a capacitor.
The RH5RI
××
2B IC uses the same chip as that employed in the RH5RI
××
1B IC and is provided with a drive
pin (EXT) for an external transistor instead of an Lx pin, so that a power transistor with a low saturation voltage
can be externally provided, whereby a large current can be caused to flow through the inductor and accordingly a
large current can be obtained. Therefore, the RH5RI
××
2B IC is recommendable to the user who need a current
as large as several tens mA toseveral hundreds mA.
The RH5RI
××
3B IC also includes an internal chip enable circuit so that it is possible to set the standby sup-
ply current at MAX. 0.5μA.
These RH5RI
××
1B/
××
2B/
××
3B ICs are suitable for use with battery-powered instruments with low noise
and ultra low supply current.
Small Number of External Components..........Only an inductor, a diode and a capacitor (RH5RI
××
1B)
Ultra Low Input Current...................................TYP. 4μA (RH5RI301B/303B at no load,with 1.5V input)
High Output Voltage Accuracy.........................±2.5%
Low Ripple and Low Noise
Low Start-up Voltage (When the output current is 1mA)......................MAX. 0.9V
High Efficiency...................................................TYP.80%
Low Temperature-Drift Coefficient of Output Voltage..........................TYP. ±50 ppm/C
Small Packages...................................................SOT-89 (RH5RI
××
1B, RH5RI
××
2B)
SOT-89-5 (RH5RI
××
3B)
FEATURES
APPLICATIONS
Power source for battery-powered equipment.
Power source for cameras, camcorders, VCRs, PDAs, electronic data banks,and hand-held communication
equipment.
Power source for appliances which require higher cell voltage than that of batteries used in the appliances.
相關(guān)PDF資料
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
RH5RI303B 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:VFM STEP-UP DC/DC CONVERTER
RH5RI303B-T1 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:VFM STEP-UP DC/DC CONVERTER
RH5RI303B-T2 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:VFM STEP-UP DC/DC CONVERTER
RH5RI311A 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC
RH5RI312B 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC
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