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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.

FEATURES

? Standby Current................................................Typ. 0?A (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.