參數(shù)資料
型號(hào)： R1211D002D-TR
廠商： RICOH COMPANY LTD
元件分類： 穩(wěn)壓器
英文描述： Step-up DC/DC Controller
中文描述： 0.05 A SWITCHING CONTROLLER, 805 kHz SWITCHING FREQ-MAX, PDSO6
封裝： 0.85 MM HEIGHT, SON-6
文件頁數(shù)： 1/33頁
文件大小： 375K
代理商： R1211D002D-TR
Step-up DC/DC Controller
R1211X Series
2001.8.30
Rev. 1.10 - 1 -
I
OUTLINE
The R1211X Series are CMOS-based PWM step-up DC/DC converter controllers with low supply current.
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 (UVLO) 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 R1211X002B/D Series, while phase compensation can be
made externally as for R1211X002A/C Series. B/D 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(A/B, 700kHz version) or
10.5ms(C/D, 300kHz version). As for the protection circuit, after the soft-starting time, if the maximum duty cycle is
continued for a certain period, the R1211X Series latch the external driver with its off state, or Latch-type protection
circuit works. 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/D 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 Options 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 height 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
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
R1211D002X 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Power Management ICs
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
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