RICOH R1286K Series PWM Step-up/Inverting DC/DC Converter for AMOLED/LCD with synchronous rectifier handbook
Contents
1. RICOH _R1286K Series PWM Step up Inverting DC DC Converter for AMOLED LCD The R1286K Series are CMOS based PWM step up inverting DC DC converters featuring 250mAx2 output current with synchronous rectifier R1286K 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 R1286K is available in two types R1286K001B is the type to which the output voltage Voute and Voutn can be adjusted by external resistors R1286KxxxA C M are the type to which the step up output voltage Voute is internally fixed and the inverting output voltage Voutn can be adjusted dynamically by the single wire interface The R1286K 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 R1286K is used for applications such as LCD and AMOLED displays 4 i _ Supply Current Ico Ae resien Typ 1 2mA Vcc 4 8V In non switching Output Current lout crt Step up 250mA Inverting 250mA Standby Current Istandby 4e eee Max 5uA Vcc Vixe 4 8V CE L Oscillator Frequency fosc eee 1 75MHz Input Voltage Range VIN tr 22. 3V to 4 8V Maximum Duty Cycle Maxduty 7 Step up Typ 85 Inverting Typ 90 Step up Output Voltage Voutp 4 6V to 5 8V internally fixed e UVLO Detect Voltage Vuvro te Typ 2 05V Externally adjustable Vrs 1V 001B Soft Start Time tssp srt Step up Typ 2 4ms Inverting Typ 2 8ms B e Inverting Output Voltage Voutn 2 0V to 6 0V internally fixed Coil current Limit Circuit eeeeeeeeeeeeeeee Step up Typ 1A Inverting Typ 1 5A Externally adjustable Vrs OV 001B Latch Protection Circuit Delay time for protection Typ 16ms Dynamically adjustable output voltage with single wire interface Auto Discharge function e Feedback Voltage Accuracy Step up 9mV Except B 15mV B Thermal Shutdown Circuit eesse Stops at 150 C Inverting 70mV Except B 25mV B Package trite DFN PLP 2730 12 BLOCK DIAGRAM TYPICAL APPLICATION R1286KxxxA C M R1286K001B R1286KxxxA C M Halogen Free Q ty per Reel Part No xxx Serial number to specify a combination of the VoutP voltage and Vourn preset E value The externally adjustable output voltage type is 001 T DFN PLP 2730 12 5 000 pes R1286Kxxxs TR Specify designation method of Voutr and Vourn settings R1286K001 TR A C to M VouTP voltage and VouTN preset value are internally fixed VouTn voltage can be adjusted dynamically by the single wire interface B Voute and Vourn are externally adjusted TYPICAL CHARACTER
3. Frequency Typ 1 75MHz Step up Typ 85 Maximum Duty Cycle Inverting Typ 90 Delay time for latch protection UVLO Detect Voltage Typ 16ms Typ 2 05V Step up Typ 2 4ms Soft Start Time inverting Typ 2 8ms B Lx Current limit Typ 1 0A Inverting Typ 1 5A Package DFN PLP 2730 12 Auto Discharge function Others Sequence Control Shutdown Function Thermal Shutdown Circuit R1285LSeries Limited lt _ lt _ _ Diode Rectifier Typ 350uA lt lt 4 6V 4 8V 5 0V 2 0V to 6 0V or Ext adjustable up to 6 0V B Typ 1 4MHz Typ 50ms Step up Typ 4 5ms Inverting Typ 4 5ms DFN2730 12 Auto Discharge function Sequence Control Shutdown Function R1283K Series AMOLED LCD CCD lt lt Typ 250uA 300kHz Typ 300uA 700kHz Typ 350uA 1 4MHz 2 5V to 5 5V Ext adjustable up to 20V Ext adjustable up to Vpp 20V Typ 300kHz A Typ 7OOkKHz B Typ 1 4MHz C Step up Typ 91 Inverting Typ 91 Typ 2 15V Typ 1 5A Typ 1 5A DFN PLP 2730 12 Auto Discharge function Inverting output Sequence Control RICOH COMPANY LTD E Ricoh presented with the Japan Management Quality Award for 1999 Ricoh continually strives to promote customer satisfaction and shares the achievements of its management quality improvement program with people and society HAIE m PUT 19994 EZ IE Ricoh completed the organization of the Lead free pr
4. ISTICS DFN PLP 2730 12 R1286Kxxxx Efficiency vs Output Current Top View Bottom View VouTP 4 6V VouTN 4 9V VouTP 5 4V VouTN 5 4V 121110 9 8 7 7 8 9 10 11 12 R1286Kxxxl does not exist For information about the versions Please contact us 123 4 5 6 xxXA C M 40 Vin 4 2 V Vin 4 2 V VOUTNS Vin 3 7 V Vin 3 7 V 30 Vin 2 9 V Vin 2 9 V Efficiency 2 Efficiency 0 25 50 75 100 125 150 175 200 225 250 275 300 Bo 794 AOU NOG ER BOO 229230273300 lur P mA bur N mA The tab is substrate level GND e Power source for AMOLED and LCD e Power source for hand held equipment No EK 283 120531 Step up Inverting DC DC Converter R1286K Series PWM Step up Inverting DC DC Converter for AMOLED LCD with synchronous rectifier Step up lInverting DC DC Converter Comparison of Step up Inverting DC DC Converters Product Name R1286K Series Application AMOLED LCD Control PWM Step up PWM Inverting Rectifier Synchronous Rectifier Supply Current In non switching MEERA Input Voltage Range 2 3V to 4 8V 4 6V to 5 8V or Step up Ext adjustable between 4 6V and 5 8V 001B Output Voltage 2 0V to 6 0V or Range i l Ext adjustable between 2 0V and 6 0V 001B nverting Dynamically adjustable inverting voltage with single wire interface VoutTn Oscillator
5. oduction for all of our products After Apr 1 2006 we will ship out the lead free products only ROHS gt eal Thus all products that will be shipped from now on comply with RoHS Directive http www ricoh com LSI I RICOH COMPANY LTD Electronic Devices Company Higashi Shinagawa Office International Sales 3 32 3 Higashi Shinagawa Shinagawa ku Tokyo 140 8655 Japan Phone 81 3 5479 2857 Fax 81 3 5479 0502 The currently available information as of May 2012 is provided in this New Product News Electronic Devices Company E Ricoh awarded ISO 14001 certification The Ricoh Group was awarded ISO 14001 certification which is an international standard for environmental management systems at both its domestic and overseas production facilities Our current aim is to obtain ISO 14001 certification for all of our business offices EK 283 120531
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RICOH R1286K Series PWM Step up/Inverting DC/DC Converter for AMOLED/LCD with synchronous rectifier