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參數(shù)資料
| 型號： | RH5RI502B |
| 廠商： | Ricoh Co., Ltd. |
| 英文描述： | VFM STEP-UP DC/DC CONVERTER |
| 中文描述： | 衡工量值式升壓型DC / DC變換器 |
| 文件頁數(shù)： | 2/24頁 |
| 文件大?。?/td> | 179K |
| 代理商： | RH5RI502B |
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 |
PDF描述 |
|---|---|
| RH5RI502B-T1 | VFM STEP-UP DC/DC CONVERTER |
| RH5RI502B-T2 | VFM STEP-UP DC/DC CONVERTER |
| RH5RI503B | VFM STEP-UP DC/DC CONVERTER |
| RH5RI503B-T2 | VFM STEP-UP DC/DC CONVERTER |
| RH5RI301B-T1 | VFM STEP-UP DC/DC CONVERTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| RH5RI502B-T1 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:VFM STEP-UP DC/DC CONVERTER |
| RH5RI502B-T2 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:VFM STEP-UP DC/DC CONVERTER |
| RH5RI503B | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:VFM STEP-UP DC/DC CONVERTER |
| RH5RI503B-T1 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:VFM STEP-UP DC/DC CONVERTER |
| RH5RI503B-T2 | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:VFM STEP-UP DC/DC CONVERTER |
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