OUTLINE

The R1280D002X Series are 2-channel PWM Step-up (as Channel 1)/Inverting (as Channel 2) DC/DC converter controllers with CMOS process.

Each of the R1280D002X 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 high efficiency Step-up/Inverting DC/DC converter can be composed of this IC with inductors, diodes, power MOSFETs, resisters, and capacitors. Each Output Voltage can be adjustable with external resistors, while soft-start time can be adjustable with external capacitors..

FEATURES

● Input Voltage Range • • • • • • • • • • • • • 2.5V to 5.5V

● Built-in Latch-type Protection Function by monitoring duty cycle (Fixed Delay Time TYP. 100ms)

● Oscillator Frequency • • • • • • • • • • • • • 700kHz(R1280D002A,B)/200kHz(r1280D002C)

● Maximum Duty Cycle • • • • • • • • • • • • • TYP. 90(Only applied to R1280D002B Series)

● High Reference Voltage Accuracy • • • • • • ±1.5

● U.V.L.O. Threshold • • • • • • • • • • • TYP. 2.2V (Hysteresis: TYP. 0.1V)

● Small Package • • • • • • • • • • • • • • • • thin SON-10 (package thickness MAX. 0.9mm)

APPLICATIONS

● Constant Voltage Power Source for portable equipment.

● Constant Voltage Power Source for LCD and CCD.