Nisshinbo Micro Devices Inc. R1286K002E-TR

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.

• Operating Voltage 2.3 V to 5.5 V
• Selectable Output Voltage (VOUTP): R1286KxxxX(1): 4.6 V to 5.8 V (0.1V Step)
• Externally Adjustable Output Voltage: R1286K001B: 4.6 V to 5.8 V
• Maximum Output Current: R1286K0xxX(1) / R1286K001B: 250 mA; R1286K1xxX (1): 300 mA
• VOUTP Voltage Load Regulation: Typ. ± 5 mV
• VOUTP Voltage Line Transient Response: Typ. ± 10 mV
• Dynamically Adjustable Output Voltage (VOUTN): -2.0 V to -6.0 V (Fixed Rate: 3.0 V, 0.1 V Step)
• Selectable Single Wire (S-Wire) I/F: R1286KxxxX(1): Default value (0.1 V Step)
• Externally Adjustable Output Voltage: R1286K001B: -2.0 V to -6.0 V
• Maximum Output Current: R1286K0xxX(1) / R1286K001B: 250 mA; R1286K1xxX (1): 300 mA
• VOUTN Voltage Load Regulation: Typ. ± 5 mV
• VOUTN Voltage Line Transient Response: Typ. ± 10 mV
• 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)
• LX peak current limit: R1286K0xxX(1): Typ. 1.0 A (CH1), 1.5 A (CH2); R1286K1xxX(1): Typ. 1.1 A (CH1), 1.8 A (CH2)
• UVLO(Under voltage lock out) protection: Typ. 2.05 V
• Thermal Shutdown: Typ. 150°C
• Operating Frequency: 1750kHz
• Package: DFN(PL)2730-12

• Fixed voltage power supply for portable equipment
• Fixed voltage power supply for AMOLED, LCD