1283Z (WLCSP-11-P2) is the discontinued product as of June, 2016. R1283x SERIES 2ch DC/DC for CCD & OLED NO.EA-157-160224 OUTLINE The R1283x 2ch DC/DC converter is designed for CCD & OLED Display power source. It contains a step up DC/DC converter and an inverting DC/DC converter to generate two required voltages by CCD & OLED Display. Step up DC/DC converter generates boosted output voltage up to 20V. Inverting DC/DC converter generates negative voltage up to VIN voltage minus 20V independently. Start up sequence is internally made. Each of the R1283x series consists of an oscillator, a PWM control circuit, a voltage reference, error amplifiers, over current protection circuits, short protection circuits, an under voltage lockout circuit (UVLO), an Nch driver for boost operation, a Pch driver for inverting. A high efficiency boost and inverting DC/DC converter can be composed with external inductors, diodes, capacitors, and resistors. FEATURES Operating Voltage ......................................... 2.5V to 5.5V Step Up DC/DC (CH1) Internal Nch MOSFET Driver (RON=400mTyp.) Adjustable VOUT Up to 20V with external resistor Internal Soft start function (Typ. 4.5ms) Over Current Protection Maximum Duty Cycle: 91%(Typ.) Inverting DC/DC (CH2) Internal Pch MOSFET Driver (RON=400m Typ.) Adjustable VOUT Up to Vdd-20V with external resistor Auto Discharge function for negative output Internal Soft start function (Typ. 4.5ms) Over Current Protection Maximum Duty Cycle: 91%(Typ.) Short Protection with timer latch function (Typ. 50ms) Short condition for either or both two outputs makes all output drivers off and latches./ If the maximum duty cycle continues for a certain time, these output drivers will be turned off. CE with start up sequence function CH1 CH2 (R1283K001x) / CH2 CH1(R1283K002x) Selectable UVLO function Operating Frequency Selection .......... 300kHz / 700kHz / 1400kHz Packages ...................................................... DFN(PLP)2730-12, WLCSP-11-P2 APPLICATION Fixed voltage power supply for portable equipment Fixed voltage power supply for CCD, OLED, LCD 1 1283Z (WLCSP-11-P2) is the discontinued product as of June, 2016. R1283x BLOCK DIAGRAM Timer Current Limit VCC PVCC UVLO PWM Control LX2 Maxduty VREF Vref Discharge VFB2 Control Vref VOUTN VFB1 Vref LX1 GND PWM Control Sequence PGND CE Control 2