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參數(shù)資料
| 型號： | R1211D002X |
| 英文描述： | Power Management ICs |
| 中文描述： | 電源管理IC |
| 文件頁數(shù)： | 1/10頁 |
| 文件大?。?/td> | 107K |
| 代理商： | R1211D002X |
Step-up DC/DC Controller
R1211X Series
2001.4.23
Rev. 0.05 - 1 -
I
OUTLINE
The R1211X Series are PWM step-up DC/DC converter controllers with low supply current by CMOS process.
Each of the R1211X Series consists of an oscillator, a PWM control circuit, a reference voltage unit, an error
amplifier, a reference current unit, a protection circuit, and an under voltage lockout circuit. A low ripple, high
efficiency step-up DC/DC converter can be composed of this IC with some external components, or an inductor, a
diode, a power MOSFET, divider resisters, and capacitors.
Phase compensation has been made internally in the R1211XB Series, while phase compensation can be made
externally as for R1211XA Series. B version has stand-by mode. Max duty cycle is internally fixed typically at 90%.
Soft start function is built-in, and Soft-starting time is set typically at 9ms(700kHz version) or 10.5ms(300kHz version).
As for the protection circuit, after the soft-starting time, if the maximum duty cycle is continued for a certain time, the
R1211X Series latch the external driver with its off state, or Latch-type protection circuit. The delay time for latch the
state can be set with an external capacitor.
To release the protection circuit, restart with power-on (Voltage supplier is equal or less than UVLO detector
threshold level), or once after making the circuit be stand-by with chip enable pin and enable the circuit again.
I
FEATURES
G
Standby Current
TYP. 0μA (for B version)
G
Input Voltage Range
2.5V to 6.0V
G
Built-in Latch-type Protection Function (Output Delay Time can be set with an external capacitor)
G
Two choices of Basic Oscillator Frequency
300kHz, 700kHz
G
Max Duty Cycle
TYP. 90%
G
High Reference Voltage Accuracy
±
1.5%
G
U.V.L.O. Threshold level
TYP. 2.2V (Hysteresis TYP. 0.13V)
G
Small Package
SOT-23-6W or thin (package thickness MAX. 0.85mm) SON-6 (Under Development)
I
APPLICATIONS
G
Constant Voltage Power Source for portable equipment.
G
Constant Voltage Power Source for LCD and CCD.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| R1211N002B-TR | Analog IC |
| R1211N002X | Power Management ICs |
| R1221N33XE-TR | SMPS Controller |
| R1221N33XF-TR | SMPS Controller |
| R1221N34XA-TR | SMPS Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| R1211D100A | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:STEP-UP DC/DC CONTROLLER |
| R1211D101A | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:STEP-UP DC/DC CONTROLLER |
| R1211D101C | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:STEP-UP DC/DC CONTROLLER |
| R1211D102A | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:STEP-UP DC/DC CONTROLLER |
| R1211D102C | 制造商:RICOH 制造商全稱:RICOH electronics devices division 功能描述:STEP-UP DC/DC CONTROLLER |
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