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R1234D281B中文资料PDF规格书
R1234D281B规格书详情
OUTLINE
The R1234D Series are CMOS-based PWM step-down DC/DC Converters with synchronous rectifier, low supply current.
Each of these ICs consists of an oscillator, a PWM control circuit, a reference voltage unit, an error amplifier, a soft-start circuit, protection circuits, a protection against miss operation under low voltage (UVLO), PWM/VFM alternative circuit, a chip enable circuit, and a driver transistor. A low ripple, high efficiency step-down DC/DC converter can be easily composed of this IC with only a few kinds of external components, or an inductor and capacitors. (As for R1234D001C/D types, divider resistors are also necessary.) In terms of Output Voltage, it is fixed internally in the R1234Dxx1A/B types. While in the R1234D001C/D types, Output Voltage is adjustable with external divider resistors.
FEATURES
• Supply Current ..................................................Typ. 230µA (R1234Dxx1A/C)
Typ. 250µA (R1234Dxx1B/D)
• Standby Current ................................................Typ. 0µA
• Input Voltage Range ........................................ 2.4V to 5.5V (ABSOLUTE MAXIMUM : 6.5V)
• Output Voltage Range.......................................2.2V to 3.3V (R1234Dxx1A/B)
0.8V to VIN (R1234Dxx1C/D)
• Output Voltage Accuracy...................................±2.0 (R1234DxxA/B)
• Oscillator Frequency.........................................Typ. 500kHz (R1234Dxx1A/C)
Typ. 800kHz (R1234Dxx1B/D)
• Built-in Driver ON Resistance ...........................Pch 0.4Ω ,Nch 0.6Ω (VIN=3V)
• Control mode switch .........................................MODE pin=”L”: PWN
MODE pin=”H”: VFM
• Efficiency...........................................................Typ. 90
• Package ............................................................SON-8
• Built-in Soft-start Function.................................Typ. 1.5ms
• Latch-type Protection Function .........................Typ. 1.5ms
• Built-in Current Limit Circuit
APPLICATIONS
• Power source for portable equipment.
产品属性
- 型号:
R1234D281B
- 制造商:
RICOH
- 制造商全称:
RICOH electronics devices division
- 功能描述:
PWM/VFM Step-Down DC/DC CONVERTER with Synchronous Rectifier
供应商 | 型号 | 品牌 | 批号 | 封装 | 库存 | 备注 | 价格 |
---|---|---|---|---|---|---|---|
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 | ||
Radiall |
23+ |
7350 |
现货供应,当天可交货!免费送样,原厂技术支持!!! |
询价 | |||
RICOH |
2020+ |
TSSOP8 |
80000 |
只做自己库存,全新原装进口正品假一赔百,可开13%增 |
询价 | ||
RICOH |
2023+ |
TSSOP8 |
700000 |
柒号芯城跟原厂的距离只有0.07公分 |
询价 | ||
Radiall |
23+ |
6000 |
诚信服务,绝对原装原盘 |
询价 | |||
KODENSHI |
21+ |
50 |
全新原装鄙视假货15118075546 |
询价 | |||
RICOH |
TSSOP8 |
899933 |
集团化配单-有更多数量-免费送样-原包装正品现货-正规 |
询价 | |||
RADIALL |
08+ |
100PCSMOQ |
880000 |
明嘉莱只做原装正品现货 |
询价 | ||
RICOH |
SSOP8L |
68500 |
一级代理 原装正品假一罚十价格优势长期供货 |
询价 | |||
RECOM-瑞科 |
24+25+/26+27+ |
车规-电源模块 |
3280 |
一一有问必回一特殊渠道一有长期订货一备货HK仓库 |
询价 |