R1286K SERIES 2ch. PWM Step-up / Inverting DC/DC Converter with Synchronous Rectifier for AMOLED / LCD NO.EA-283-191114 OUTLINE The R1286K 2ch DC/DC converter is designed for AMOLED display power source. It contains a step up DC/DC converter and an inverting DC/DC converter. Step up DC/DC converter generates boosted output voltage to 4.6 V to 5.8 V (Selectable). Inverting DC/DC converter generates negative voltage down to -2.0 V to -6.0 V (Selectable) that is dynamically adjustable with single wire interface signal. R1286K consist of a voltage reference, error amplifiers, an oscillator, PWM control circuits, over current protection circuits, short protection circuits, an under voltage lockout circuit (UVLO), thermal shutdown circuit, a NMOS driver and a synchronous PMOS switch for boost converter, a PMOS driver and a synchronous NMOS switch for inverting converter, and so on. High efficiency boost and inverting DC/DC converters can be composed with two external inductors and three capacitors. FEATURES Operating Voltage 2.3 V to 5.5 V Step-up DC/DC Converter (CH1) (1) Selectable Output Voltage (VOUTP) R1286KxxxX : 4.6 V to 5.8 V (0.1V Step) Externally Adjustable Output Voltage R1286K001B: 4.6 V to 5.8 V (1) Maximum Output Current R1286K0xxX / R1286K001B: 250 mA (1) R1286K1xxX : 300 mA VOUTP Voltage Load Regulation Typ. 5 mV VOUTP Voltage Line Transient Response Typ. 10 mV Inverting DC/DC Converter (CH2) Dynamically Adjustable Output Voltage (VOUTN) -2.0 V to -6.0 V (Fixed Rate: 3.0 V, 0.1 V Step) (1) Selectable Single Wire (S-Wire) I/F R1286KxxxX : Default value (0.1 V Step) Externally Adjustable Output Voltage R1286K001B: -2.0 V to -6.0 V (1) Maximum Output Current R1286K0xxX / R1286K001B: 250 mA (1): R1286K1xxX 300 mA VOUTN Voltage Load Regulation Typ. 5 mV VOUTN Voltage Line Transient Response Typ. 10 mV Controller Internal Start-up Sequence Control with Soft-start Operation Auto Discharge Operation for Both Outputs Short circuit protection Internal timer-latch protection ............................... Typ. 16 ms or 40 ms Maximum duty cycle ............................................. Typ. 85% (CH1) / Typ. 90% (CH2) (1) X : A to N (Provided except B and I) 1 R1286K NO.EA-283-191114 (1) LX peak current limit R1286K0xxX Typ. 1.0 A (CH1), 1.5 A (CH2) (1) R1286K1xxX Typ. 1.1 A (CH1) 1.8 A (CH2) UVLO(Under voltage lock out) protection ............. Typ. 2.05 V Thermal Shutdown ................................................ Typ. 150C Operating Frequency ............................................ 1750kHz Package ................................................................ DFN(PLP)2730-12 APPLICATION Fixed voltage power supply for portable equipment Fixed voltage power supply for AMOLED, LCD 2