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R1232D131A 数据表 (PDF) - RICOH electronics devices division

R1232D131A Datasheet PDF - RICOH electronics devices division
部件名 R1232D131A
下载  R1232D131A 下载

文件大小   845.41 Kbytes
  24 Pages
制造商  RICOH [RICOH electronics devices division]
网页  http://www.ricoh.com
标志 RICOH - RICOH electronics devices division
功能描述 PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER

R1232D131A Datasheet (PDF)

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R1232D131A Datasheet PDF - RICOH electronics devices division

部件名 R1232D131A
下载  R1232D131A Click to download

文件大小   845.41 Kbytes
  24 Pages
制造商  RICOH [RICOH electronics devices division]
网页  http://www.ricoh.com
标志 RICOH - RICOH electronics devices division
功能描述 PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER

R1232D131A 数据表 (HTML) - RICOH electronics devices division

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R1232D131A 产品详情

OUTLINE

The R1232D Series are CMOS-based PWM step-down DC/DC converters with synchronous rectifier, low supply current. As an output capacitor, a 10µF or more ceramic capacitor can be used with the R1232D. Each of these ICs consists of an oscillator, a PWM control circuit, a voltage reference unit, an error amplifier, a soft-start circuit, protection circuits, a protection against miss operation under low voltage (UVLO), a chip enable circuit, a synchronous rectifier, Nch. driver transistor, and so on. 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 R1232D001x type, divider resistors are also necessary.) In terms of the output voltage, it is fixed internally in the R1232Dxx1x types. While in the R1232D001x types, the output voltage is adjustable with external divider resistors.



FEATURES

• Two choices of Oscillator Frequency ............................1MHz, 2.25MHz

(Small inductors can be used. 4.7µH for 1MHz/2.2µH for 2.25MHz)

• Built-in Driver ON Resistance .......................................P-channel 0.2Ω (at VIN=5.0V)

• Built-in Soft-start Function.............................................Typ. 1.0ms (fosc=1MHz type)

• Output Voltage ..............................................................0.9V to 3.3V (xx1x Type)

0.8V to VIN (001x Type)

• High Accuracy Output Voltage ......................................±2.0%

• Built-in Current Limit Circuit ..........................................Typ. 1.4A

• Package ........................................................................SON-8 (t=0.9mm)



APPLICATIONS

• Power source for portable equipment such as PDA, DSC, Notebook PC.

• Power source for HDD




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