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

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Provides at-a-glance product features, functions, and concepts.
ECAD Model: Learn more
  • Standard
  • For Industrial
  • For Automotive
  • AEC-Q100
  • Product Longevity Program
  • RoHS
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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

Standard 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 OCP OVP UVLO OVLO Reverse Shutdown Soft Start SSCG PGOOD Auto Discharge Anti-ringing Sequencing Max Duty Ext. Phase LED Adjust

Functional Description

TSD Thermal Shutdown Function
OCP Overcurrent Protection

Note: The function previously labeled as "ILX (LX Current Limit Function)" is now shown as "OCP."
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

Functional Description

TSD Thermal Shutdown Function
OCP Overcurrent Protection

Note: The function previously labeled as "ILX (LX Current Limit Function)" is now shown as "OCP."
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

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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      • [A]

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.

FAQ

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Buy / Contact

  • Purchase, Request for samples and documents
    Sales are made through distributors. Please contact your local distributors for any sales-related inquiry such as price.
  • Available from 1 piece!
    Our electronic device products are available through our authorized online distributors.
  • Technical Support
R1276 Series