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R1286K Series

2ch DCDC (Step Up DC/DC and Inverting DC/DC)

Data Sheet / Flyer


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The R1286 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 4.6V ~ 5.8V(Selectable). Inverting DC/DC converter generates negative voltage down to -2.0V ~ -6.0V(Selectable) that is dynamically adjustable with single wire interface signal. R1286 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		2.3V to 4.8V
Step Up DC/DC (CH1)
	Output Voltage (VOUTP)	4.6V to 5.8V (Selectable / 0.1V Step)	[ R1286KxxxX ]
	Adjustable VOUT from 4.6V to 5.8V with external resistors		[ R1286K001B ]
	Output Current (IOUTP)	250mA	[ R1286K0xxX/R1286K001B]
		300mA	[ R1286K1xxX]
Inverting DC/DC (CH2)
	Dynamically adjustable Output Voltage (VOUTN)	-2.0V to -6.0V (Range is fixed 3.0V / 0.1V Step)
	Single wire (S-Wire) interface (Default Value is Selectable / 0.1V Step)		[ R1286KxxxX ]
	Adjustable VOUT from -2.0V to -6.0V with external resistors		[ R1286K001B ]
	Output Current (IOUTN)	250mA	[ R1286K0xxX/R1286K001B]
		300mA	[ R1286K1xxX]
Control and Protection
	Internal start up sequence control with soft start operation
	Auto discharge operation for both outputs
Over current protection		Typ.1.0A(boost) / 1.5A(inverting)	[ R1286K0xxX ]
		Typ.1.1A(boost) / 1.8A(inverting)	[ R1286K1xxX ]
	Short circuit protection
	UVLO(Under voltage lock out) protection	2.05V
	Thermal shutdown	150°C
	Operating frequency	1750kHz
	Maximum Duty Cycle	85% for boost converter / 90% for inverting converter
Package		DFN(PLP)2730-12