R1282 Series
PWM Step-up/Step-down DC/DC Controller

Download Datasheet

  • Description

    The R1282 Series are low supply current dual output CMOS-based PWM step-up/step-down DC/DC controllers. R1282 includes a soft start circuit, an under-voltage lockout circuit (UVLO), and a latch type protection circuit. By simply using inductors, resistors, capacitors, power MOS, and diodes, as external components, a high-efficiency step-up/step-down DC/DC converter can be easily configured. The oscillator maximum duty cycle, phase compensation, and soft start time can be set with an external resistor and capacitor.

  • Spec
    Input Voltage Range 2.5 V to 5.5 V (6.5 V)
    Operating Temperature Range -40°C to 85°C (125°C)
    Supply Current Typ. 1.4 mA (VIN = 5.5 V, EXT at no load)
    Feedback Voltage Both Boost & Inverting: 1.0 V
    Feedback Voltage Accuracy ±1.5%
    Oscillator Frequency Typ. 700 kHz
    Package SON-10

    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

      L1,L2: 6.8µH, C1=C2=10µF

    • Efficiency vs. Output Current

      Efficiency vs. Output Current

    • Efficiency vs. Output Current

      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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