R1290 Series
Triple Output DC/DC Converter for LCD/CCD

Download Datasheet

  • Description

    The R1290 Series are triple output CMOS-based step-up/inverting DC/DC converters. R1290 consists of the inductor type PWM step-up DC/DC converter (DC/DC1) with an internal 2A Nch. driver and charge pump type positive/negative DC/DC converters (DC/DC2, DC/DC3). Triple output start-up sequence can be set by external capacitors. R1290 is ideally suitable for use in power source for equipment that requires sequence control such as LCD and CCD.

  • Spec
    Consumer Automotive
    Input Voltage Range 2.0 V to 5.5 V (6.5 V)
    Operating Temperature Range -40°C to 95°C (125°C) -40°C to 105°C (125°C)
    Supply Current Typ. 3.5 mA
    Standby Current Typ. 0.1 µA
    Output Voltage Range Boost DC/DC: Max. 20 V (Externally Adjustable)
    Feedback Voltage 1.0 V
    Feedback Voltage Accuracy ±15 mV
    Feedback Voltage Temperature Coefficient Typ. ±150 ppm/°C
    Driver ON-resistance Typ. 150 mΩ
    Oscillator Frequency Externally Adjustable: 180 kHz to 1.4 MHz
    Package QFN0404-24
    Charge-pump Output Voltage Adjustable with external resistors
    Charge-pump VREF/CPPFB Voltage Temperature Coefficient VREF Voltage Temperature Coefficient: Typ. 150 ppm/°C
    CPPFB Voltage Temperature Coefficient: Typ. 150 ppm/°C
    Charge-pump Oscillator Frequency 1/4 of the main step-up DC/DC converter oscillator frequency

    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
    • Typical Application

      Typical Application

      For external parts, please refer to the datasheet.

    • 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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