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R1211N002B-TR Datasheet

  • R1211N002B-TR

  • Analog IC

  • 10頁(yè)

  • ETC

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2001.4.23
Step-up DC/DC Controller
R1211X Series
s
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.
s
FEATURES
q
Standby Current
鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?/div>
TYP. 0碌A(chǔ) (for B version)
q
Input Voltage Range
鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?/div>
2.5V to 6.0V
q
Built-in Latch-type Protection Function (Output Delay Time can be set with an external capacitor)
q
Two choices of Basic Oscillator Frequency
鈥?鈥?/div>
300kHz, 700kHz
q
Max Duty Cycle
鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?/div>
TYP. 90%
q
High Reference Voltage Accuracy
鈥?鈥?鈥?鈥?鈥?鈥?鈥?鹵1.5%
q
U.V.L.O. Threshold level
鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?鈥?/div>
TYP. 2.2V (Hysteresis TYP. 0.13V)
q
Small Package
鈥?鈥?鈥?鈥?鈥?/div>
SOT-23-6W or thin (package thickness MAX. 0.85mm) SON-6 (Under Development)
s
APPLICATIONS
q
Constant Voltage Power Source for portable equipment.
q
Constant Voltage Power Source for LCD and CCD.
Rev. 0.05
-1-

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