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R1211N002A Datasheet(PDF) 1 Page - RICOH electronics devices division |
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R1211N002A Datasheet(HTML) 1 Page - RICOH electronics devices division |
1 / 40 page R1211x SERIES STEP-UP DC/DC CONTROLLER NO.EA-088-0604 1 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. FEATURES • Standby Current ................................................Typ. 0µA (for B/D version) • Input Voltage Range .........................................2.5V to 6.0V • Built-in Latch-type Protection Function (Output Delay Time can be set with an external capacitor) • Two Options of Basic Oscillator Frequency ......300kHz, 700kHz • Max Duty Cycle.................................................Typ. 90% • High Reference Voltage Accuracy ....................±1.5% • U.V.L.O. Threshold level ...................................Typ. 2.2V (Hysteresis Typ. 0.13V) • Small Packages ................................................SOT-23-6W or thin (package height Max. 0.85mm) SON-6 APPLICATIONS • Constant Voltage Power Source for portable equipment. • Constant Voltage Power Source for LCD and CCD. |
Similar Part No. - R1211N002A_06 |
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Similar Description - R1211N002A_06 |
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