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R1221N25AC-TR中文资料PDF规格书
R1221N25AC-TR规格书详情
OUTLINE
The R1221N Series are PWM step-down DC/DC Converter controllers embedded with a voltage detector, with low supply current by CMOS process.
Each step-down DC/DC converter in these ICs consists of an oscillator, a PWM control circuit, a reference voltage unit, an error amplifier, a soft-start circuit, a protection circuit, a PWM/VFM alternative circuit, a chip enable circuit, and resistors for voltage detection. A low ripple, high efficiency step-down DC/DC converter can be composed of this IC with only four external components, or a power-transistor, an inductor, a diode and a capacitor.
The output voltage of DC/DC converter can be supervised by the built-in voltage detector.
With a PWM/VFM alternative circuit, when the load current is small, the operation turns into the VFM oscillator from PWM oscillator automatically, therefore the efficiency at small load current is improved.
FEATURES
● Wide Range of Input Voltage · · · · · · · · · · · · · 2.3V to 13.2V
● Built-in Soft-start Function and two choices of Protection Function(Latch-type or Reset-type)
● Two choices of Oscillator Frequency · · · · · · · · · · 300kHz, 500kHz
● High Efficiency · · · · · · · · · · · · · · · · · · · · · · TYP. 90
● Standby Current · · · · · · · · · · · · · · · · · · · · · TYP. 0µA
● Setting Output Voltage · · · · · · · · · · · · · · · · · Stepwise setting with a step of 0.1V in the range of 1.5V to 5.0V
● High Accuracy Output Voltage · · · · · · · · · · · · · · ±2.0
● Setting Detector Threshold Voltage · · · · · · · · · · · Stepwise setting with a step of 0.1V in the range of 1.2V to 4.5V
● High Accuracy Detector Threshold Voltage· · · · · · · ±2.0
● Low Temperature-Drift Coefficient of Output Voltage · TYP. ±100ppm/°C
APPLICATIONS
● Power source for hand-held communication equipment, cameras, video instruments such as VCRs, camcorders.
● Power source for battery-powered equipment.
● Power source for household electrical appliances.
供应商 | 型号 | 品牌 | 批号 | 封装 | 库存 | 备注 | 价格 |
---|---|---|---|---|---|---|---|
RICOH/理光 |
20+ |
SOT23-6 |
5000 |
原装正品 |
询价 | ||
Ricoh Electronic Devices Compa |
20+21+ |
Reel |
8880 |
十年老店,原装正品 |
询价 | ||
RICOH |
22+23+ |
New |
34323 |
绝对原装正品现货,全新深圳原装进口现货 |
询价 | ||
RICOH |
21+ |
SOT23-6 |
12588 |
原装正品,自己库存 假一罚十 |
询价 | ||
RICOH/理光 |
SOT23-6 |
11200 |
原厂授权一级代理、全球订货优势渠道、可提供一站式BO |
询价 | |||
23+ |
N/A |
58600 |
一级代理放心采购 |
询价 | |||
RICOH(理光) |
23+ |
SOT235 |
7350 |
现货供应,当天可交货!免费送样,原厂技术支持!!! |
询价 | ||
ROH/理光 |
23+ |
NA/ |
3000 |
优势代理渠道,原装正品,可全系列订货开增值税票 |
询价 | ||
RICOH |
1923+ |
SOT-153 |
35689 |
绝对进口原装现货库存特价销售 |
询价 | ||
RICOH/理光 |
23+ |
SOT-23-6 |
50000 |
全新原装正品现货,支持订货 |
询价 |