R1214 Series
PWM/VFM Step-up DC/DC Converter for White LED

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  • Description

    The R1214 Series are PWM/VFM step-up DC/DC converters for white LEDs. The R1214 includes 2-channel current drivers for white LEDs, an under voltage lockout circuit (UVLO), an overvoltage protection circuit (LxOVP, LEDOVP) and a thermal shutdown protection circuit. The R1214 requires only a small numbers of external components to drive white LEDs with constant current and high efficiency. The power controlling method can be selected from fixed PWM control or PWM/VFM auto switching control. The brightness of the LEDs can be adjusted quickly by applying a 200-Hz to 300-kHz PWM signal to the PWM pin. A 1.27-mm square compact WLCSP-9-P1 package is available.

  • Spec
    Input Voltage Range 2.7 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. 0.2 µA
    Output Voltage Range Externally Adjustable: Max. 29 V
    Driver ON-resistance Typ. 0.25 Ω (VIN = 3.6 V)
    Oscillator Frequency Typ. 750 kHz, 450 kHz
    Maximum Duty Cycle Typ. 96% (R1214Z211x)
    Typ. 94% (R1214Z221x)
    Package WLCSP-9-P1
    LED電流精度 ±2.0% (R1214ZxxxA/B)
    ±1.5% (R1214ZxxxC/D)

    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

    • R1214Z Efficiency vs. Output Current

      R1214Z 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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