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R1276 Series
3A 30V Input Step-down DC/DC Converter with Synchronous Rectifier

  • Description

    The R1276 is a 36-V rated synchronous step-down DC/DC converter with built-in transistor. Under cranking condition, the switching frequency is automatically reduced to keep output voltage level constant.

    Key Benefits

    • High efficiency of 95%
    • Maintains the output voltage constant at cranking by reducing a switching frequency to the minimum 1/4.
    • Achieves the EMI noise reduction by using a spread spectrum clock generator. (Diffusion Rate: +10%).

  • Spec
    Consumer Industrial Automotive
    Input Voltage Range 3.6 V to 30.0 V (36.0 V)
    Operating Temperature Range -40°C to 105°C (125°C) -40°C to 125°C (150°C) -40°C to 125°C (150°C)
    Supply Current Typ. 12 µA (VFM, at no switching)
    Standby Current Typ. 4 µA
    Start-up Voltage 4.5 V
    Output Voltage Range Externally Adjustable: 0.7 V to 6.5 V
    Feedback Voltage 0.64 V
    Feedback Voltage Accuracy ±1.0%
    Output Current 3 A
    Driver ON-resistance High-side: Typ. 0.145 Ω
    Low-side: Typ. 0.095 Ω
    Oscillator Frequency 250 kHz to 1 MHz (Settable with external resistors)*1
    Efficiency 95%
    Package HSOP-18
    • *1: In the case of 0.7 V ≤ VOUT < 3.3 V, the configurable range is 250 kHz ≤ fOSC ≤ 600 kHz.
    Download Datasheet

    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
    Functional Description
  • Technical
    Documents

    • Typical Application

      Typical Application

    • Efficiency Characteristics (VOUT = 5V)

      R1276 Typical Characteristics

    • 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 &
    Packages
    Product Name Compatibility Package Marking Reliability
    R1276Sxxxx-E2-FE
    • gradeConsumer
    • plp
    		 HSOP-18 R1276S R1276S-FE
    R1276Sxxxx-E2-YE
    • gradeIndustrial
    • plp
    		 HSOP-18 R1276S R1276S-YE
    R1276Sxxxx-E2-AE
    • gradeAutomotive
    • aecQ100
    • plp
    		 HSOP-18 R1276S R1276S-AE
    R1276Sxxxx-E2-KE
    • gradeAutomotive
    • aecQ100
    • plp
    		 HSOP-18 R1276S R1276S-KE
    • 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.
  • Sample / Buy
Similar Products

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

Search for similar products under conditions below.

Category:DC/DC Switching Regulators

Topology Buck
VIN
min (V)		 3.6
VIN
max (V)		 30.0
VOUT
min (V)		 0.7
VOUT
max (V)		 6.5
IOUT
(mA)		 3000
ISS
(µA)		 12