R1290K001A-E2 Nisshinbo

R1290K SERIES 3ch DC/DC for TFT LCD No.EA-154-210517 OUTLINE The R1290 series are the optimized DC/DC converter ICs for TFT LCD displays. Each of the R1290 series contains one PWM step-up DC/DC converter controller and two diode charge-pump controllers. The charge-pumps can control a boost output and a negative output and have the output voltage regulation function with external resistors. The power on sequence can be made with setting the delay time with external capacitors for each charge pump channel. FEATURES Operating Voltage Range ...................................... 2.0V ~ 5.5V Step-up DC/DC controller part Internal 2A capability Nch MOSFET Driver (RON=150m Typ.) Over Current Protection Function Adjustable VOUT up to 20V with external resistors Adjustable Phase compensation with external components Max duty adjustable with external resistors for DTC pin Soft-start time adjustable with external capacitor for SS pin Oscillator Frequency: Adjustable frequency with resistors (180kHz~1400kHz) Charge-pump part Adjustable output voltage with external resistors Sequence function: Charge-pump turns on after the main step-up converter voltage outputs. The positive charge-pump and the negative charge-pump turn on sequence control is possible with setting delay time for each channel Oscillator Frequency: 1/4 of the main step-up DCDC converter oscillator frequency Controller part Under Voltage Lock-Out (UVLO: selectable detector threshold from 1.8V, 2.2V or 2.8V) Reference voltage (VREF: Typ.1.2V) Short Protection with timer latch function (adjustable delay time with external capacitor) : Shutdown all the outputs if at least one of three outputs is short to the GND. Stand-by function by CE pin Package Thin 24-pin Package QFN0404-24 APPLICATIONS Power source for hand-held equipment Power source for LCD and CCD 1 R1290x No.EA-154-210517 BLOCK DIAGRAM LX RT OSC Current Limit LX VIN UVLO PGND PWM Output Control PGND DTC Duty Limit VFB + DELAY SS Timer Vref AMPOUT CE Short Protection TST Start CPPSW Sequence CPPDLY CPNDLY CPVCC CPVCC Negative Positive CPP Charge-pump Charge-pump CPN Control Control CPGND CPGND CPNFB + CPPFB + Soft Start Vref Vref AGND VREF Vref SELECTION GUIDE The UVLO threshold voltage can be selected at the users request . The selection can be available by designating the part number as shown below, Product Name Package Quantity per Reel Pb Free Halogen Free QFN0404-24 1,000 pcs R1290K10xAE2 x Designation of UVLO threshold 11.8V 22.2V 32.8V 2