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參數(shù)資料
| 型號： | R1232D271A-TR |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.5 A SWITCHING REGULATOR, 1250 kHz SWITCHING FREQ-MAX, DSO8 |
| 封裝： | 0.90 MM HEIGHT, SON-8 |
| 文件頁數(shù)： | 1/24頁 |
| 文件大?。?/td> | 883K |
| 代理商： | R1232D271A-TR |
R1232D SERIES
PWM/VFM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER
NO.EA-129-0604
1
OUTLINE
The R1232D Series are CMOS-based PWM step-down DC/DC converters with synchronous rectifier, low
supply current. As an output capacitor, a 10
F 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), PWM/VFM
alternative circuit, 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 Output Voltage, it is fixed internally in the R1232Dxx1x types. While in the R1232D001x types, Output
Voltage is adjustable with external divider resistors.
PWM/VFM alternative circuit is active with Mode Pin of the R1232D Series. Thus, when the load current is
small, the operation can be switching into the VFM operation from PWM operation by the logic of MODE pin and
the efficiency at small load current can be improved. As protection circuits, current limit circuit which limits peak
current of LX at each clock cycle, and latch type protection circuit which works if the term of the over-current
condition keeps on a certain time in PWM mode exist. Latch-type protection circuit works to latch an internal
driver with keeping it disable. To release the condition of protection, after disable this IC with a chip enable circuit,
enable it again, or restart this IC with power-on or make the supply voltage at UVLO detector threshold level or
lower than UVLO.
FEATURES
Two choices of Oscillator Frequency ............................1MHz, 2.25MHz
(Small inductors can be used. 4.7
H for 1MHz/2.2H for 2.25MHz)
Built-in Driver ON Resistance .......................................P-channel 0.2 (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% (PWM Mode)
Built-in Current Limit Circuit ..........................................Typ. 1.4A
Package ........................................................................SON-8 (t=0.9mm)
APPLICATIONS
Power source for portable equipment such as cellular, PDA, DSC, Notebook PC.
Power source for HDD
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相關(guān)代理商/技術(shù)參數(shù) |
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| R1232D271B | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER |
| R1232D281A | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER |
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| R1232D291A | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER |
| R1232D291B | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER |
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