R1206 Series
PWM Step-up DC/DC Converter for White LED

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  • Description

    The R1206 Series are CMOS-based PWM step-up DC/DC converters, which are optimized to drive white LEDs with constant current. R1206 includes an under-voltage lockout circuit (UVLO), and over-voltage protection circuit (OVP). By simply using an inductor, a resistor, capacitors and a diode as external components, white LEDs can be driven with constant current and high efficiency. The LED current can be determined by the value of current setting resistor. The brightness of the LEDs can be adjusted quickly by applying a PWM signal (200Hz to 300kHz) to the CE pin. Two different pin layout of SOT-23-6 package as R1203N and R1206N are available.

  • Spec
    Input Voltage Range 1.8 V to 5.5 V (6.5 V)
    Operating Temperature Range -40°C to 85°C (125°C)
    Supply Current Typ. 500 µA
    Standby Current Typ. 1 µA
    Output Voltage Range Externally Adjustable: Max. 28.7 V
    Feedback Voltage 0.2 V
    Feedback Voltage Accuracy ±10mV
    Feedback Voltage Temperature Coefficient ±150 ppm/°C
    Driver ON-resistance Typ. 1.35 Ω
    Oscillator Frequency Typ. 1.2 MHz
    Maximum Duty Cycle Typ. 91%
    Package SOT-23-6

    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
    • R1206N071B Typical Application

      R1206N071B Typical Application

    • 7LEDs Efficiency vs. Output Current

      7LEDs 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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