R1287 Series
PWM/VFM, Dual-channel Step-up/Inverting DC/DC Converter with Synchronous Rectifier for LCD

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  • Description

    The R1287 Series are CMOS-based PWM/VFM dual-channel step-up/inverting DC/DC converters with synchronous rectifier for LCD.

    The R1287 includes a soft-start circuit, an under-voltage lockout circuit (UVLO), a latch-type short circuit protection, and a thermal 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.

    The R1287 provides two control types: the PWM control and the PWM/VFM auto switching control.

    Both CH1 and CH2 can independently control the ON/ OFF control and freely set the starting sequence and shutdown sequence.

    Both CH1 and CH2 own an auto-discharge function which actively discharges the output voltage to ground within a short time in shutdown mode.

    The R1287 is used for the application of the LCD.

  • Spec
    Input Voltage Range 2.5 V to 5.5 V (6.0 V)
    Operating Temperature Range -40°C to 85°C (125°C)
    Supply Current Typ. 470 µA
    Standby Current Typ. 0.1 µA
    Output Voltage Range Boost: 4.5 V to 5.8 V (Internally Fixed or Externally Configurable)
    -4.5 V to -5.8 V (Internally Fixed)
    -4.5 V to -6.0 V (Externally Configurable)
    Output Voltage Accuracy Boost: ±0.9% / Inverting; ±1%
    Feedback Voltage Boost: 1.0 V / Inverting; 0 V
    Feedback Voltage Accuracy Boost: ±15 mV / Inverting: ±30 mV
    Output Current Boost , Inverting: 200 mA (B/D/F/H), 100 mA (C/G)
    Oscillator Frequency Boost: 900 kHz (B/F), 300 kHz (C/G), 1 MHz (D/H)
    Inverting: 1.1 MHz (B/F), 300 kHz (C/G), 1 MHz (D/H)
    Maximum Duty Cycle Boost , Inverting: Typ. 90% (B/D/F/H), Typ. 97% (C/G)
    Package WLCSP-12-P1, DFN3030-12

    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
    • R1287xxxxy Typical Application (Fixed Output Voltage Type)

      R1287xxxxy Typical Application (Fixed Output Voltage Type)

      C1(CIN),C2(COUTP),C3(COUTN): 10µF

    • R1287x001B Efficiency vs. Output Current

      R1287x001B Efficiency vs. Output Current

    • R1287x001C Efficiency vs. Output Current

      R1287x001C Efficiency vs. Output Current

    • Related Links

      • Prime Designer

        Online Design Tool

        Registration to myNISD is required to use some of the functions, such as simulations.

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  • Quality &
    • 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.

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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