R1286 Series

PWM Step-up/Inverting DC/DC Converter with Synchronous Rectifier for AMOLED/LCD

Download Datasheet

Description

The R1286 Series are CMOS-based PWM step-up/inverting DC/DC converters featuring 250mA×2 output current with synchronous rectifier. R1286 includes a soft start circuit, an under-voltage lockout circuit (UVLO), a latch protection circuit, a thermal shutdown circuit, and a shutdown circuit. By simply using two inductors and three capacitors as external components, a high-efficiency step-up/inverting DC/DC converter can be easily configured.

R1286 is available in two types: R1286K001B is the type to which the output voltage (VOUTP and VOUTN) can be adjusted by external resistors. R1286KxxxA/C to N are the type to which the step-up output voltage (VOUTP) is internally fixed and the inverting output voltage (VOUTN) can be adjusted dynamically by the single wire interface. The R1286 has a sequenced start up. After the CE pin is enabled, the step-up output is starting up followed by the inverting output after a delay time. As for shutdown, both outputs will be turned off by the auto-discharge function. R1286 is used for applications such as LCD and AMOLED displays.

Spec

	Consumer
Input Voltage Range	2.3 V to 5.5 V (6.0 V)
Operating Temperature Range	-40°C to 85°C (125°C)
Supply Current	Typ. 1.2 mA
Standby Current	Typ. 0.1 µA
Output Voltage Range	Boost: 4.6 V to 5.8 V (Internally fixed or Externally Configurable) Inverting: -2.0 V to -6.0 V (Internally fixed or Externally Configurable)
Output Voltage Accuracy	Boost: ±0.9% / Inverting: ±70 mV
Feedback Voltage	Boost: 1.0 V / Inverting: 0 V
Feedback Voltage Accuracy	Boost: ±15 mV / Inverting: ±25 mV
Output Current	Boost: 250 mA / Inverting: 250 mA
Oscillator Frequency	Typ. 1.75 MHz
Maximum Duty Cycle	Boost: Typ. 85% / Inverting: Typ. 90%
Package	DFN(PL)2730-12

Download Datasheet

TSD	ILX	OCP	OVP	UVLO	OVLO	Reverse	Shutdown	Soft Start	SSCG	PGOOD	Auto Discharge	Anti-ringing	Sequencing	Max Duty	Ext. Phase	LED Adjust

Functional Description

Quality &
Packages

Product Name	Compatibility	Package	Marking	Reliability
R1286Kxxxx-TR		DFN(PL)2730-12	See datasheet	R1286K

Refer to the datasheets for the details on the product.
The package file or the datasheet includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.

TSD	Thermal Shutdown Function
ILX	LX Current Limit Function
OCP	Overcurrent Protection
OVP	Overvoltage Protection
UVLO	Undervoltage Lockout Protection
OVLO	Overvoltage Lockout Protection
Reverse	Reverse Current Protection Circuit
Shutdown	Shutdown Function
Soft Start	Soft Start Function
SSCG	Spread Spectrum Clock Generator Function
PGOOD	Power Good Output
Auto Discharge	Auto Discharge Function
Anti-ringing	Anti-ringing Switch Function
Sequencing	Start-up Sequencing Control
Max Duty	Maximum Duty Cycle
Ext. Phase	Externally Adjustable Phase Compensation
LED Adjust	LED High-speed Dimming Control