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参数资料
| 型号： | RH5RI332B-T1 |
| 厂商： | RICOH COMPANY LTD |
| 元件分类： | 稳压器 |
| 英文描述： | 0.05 A SWITCHING CONTROLLER, 100 kHz SWITCHING FREQ-MAX, PSSO3 |
| 封装： | SOT-89, 3 PIN |
| 文件页数： | 12/24页 |
| 文件大小： | 179K |
| 代理商： | RH5RI332B-T1 |
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. 0.5A.
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. 4A (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.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| RH5RI333B | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| RH5RI341A | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| RH5RI342B | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| RH5RI343B | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
| RH5RI351A | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
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