R1282D002A-TR-FE Nisshinbo

R1282D002A SERIES 2CH PWM DC/DC CONTROLLER NO.EA-086-160126 OUTLINE The R1282D002A is a CMOS-based 2-channel PWM Step-up (as Channel 1)/Step-down (as Channel 2) DC/DC converter controller. The R1282D002A 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/Step-down DC/DC converter can be composed of this IC with inductors, diodes, power MOSFETs, resisters, and capacitors. Each output voltage and maximum duty cycle can be adjustable with external resistors, while soft-start time can be adjustable with external capacitors and resistors. As for a protection circuit, if Maximum duty cycle of either Step-up DC/DC converter side or Step-down DC/DC converter side is continued for a certain time, the R1280D002A latches both external drivers with their off state by its Latch-type protection circuit. Delay time for protection is internally fixed typically at 100ms. To release the protection circuit, restart with power-on (Voltage supplier is equal or less than UVLO detector threshold level). 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 High Accuracy Voltage Reference .................... 1.5% U.V.L.O. Threshold ............................................ Typ. 2.2V (Hysteresis: Typ. 0.2V) 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. 1 R1282D002A BLOCK DIAGRAM DTC1 VFB1 EXT1 OSC AMPOUT1 CH1 VIN Vref1 UVLO GND Vrefout Vrefout EXT2 VFB2 Vref2 Latch Delay Circuit CH2 DTC2 SELECTION GUIDE The selection can be made with designating the part number as shown below Product Name Package Quantity per Reel Pb Free Halogen Free R1282D002x-TR-FE SON-10 3,000 pcs Yes Yes x: Designation of Mask Option A version: fosc=700kHz, with External Phase Compensation for Channel 1 2