R1286 Series
PWM Step-up/Inverting DC/DC Converter with Synchronous Rectifier for AMOLED/LCD

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  • 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(PLP)2730-12

    Protections / Functions

    TSD ILX OCP OVP UVLO OVLO Reverse Shutdown Soft Start SSCG PGOOD Auto Discharge Anti-ringing Sequencing Max Duty Ext. Phase LED Adjust
  • Technical
    Documents
    • R1286KxxxA/C to N Typical Application

      R1286KxxxA/C to N Typical Application

      C1,C2,C3: 4.7µF

    • R1286K001B Typical Application

      R1286K001B Typical Application

      C1,C2,C3: 4.7µF, C4: 0.1µF

    • R1286 Efficiency vs. Output Current

      R1286 Efficiency vs. Output Current

    • R1286 Efficiency vs. Output Current

      R1286 Efficiency vs. Output Current

  • Quality &
    Packages
    • Refer to the datasheets for the details on the product.
    • The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.
    • Please contact us or our distributors for unpublished reliability information.

Download Datasheet

Functional Description

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

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Category:DC/DC Switching Regulators

Topology Boost,Inverting
VIN
min (V)
2.3
VIN
max (V)
5.5
VOUT
min (V)
4.6
VOUT
max (V)
5.8
IOUT
(mA)
250
ISS
(µA)
1200