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R1271 Series
30 V, 1 A Synchronous PWM Step-down DC/DC Converter

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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 R1271 is a synchronous step-down DC/DC converter with a maximum input voltage rating of 42 V. This device is suitable for small inductors with the switching frequency of 2 MHz. The external components are only an inductor and several capacitors and a resistance. The tiny DFN package option makes the power circuit compact.

Key Benefits

  • High efficiency 85% is realized with switching frequency of 2 MHz
  • The output voltage is maintained at cranking by reducing a switching frequency to minimum 1/4 of normal frequency.
  • 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 (42.0 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. 1 mA
Standby Current Typ. 4 µA
Start-up Voltage 4.5 V
Output Voltage Range 3.3 V, 3.6 V, 4.0 V, 5.0 V
Output Voltage Accuracy ±1.0% (Ta = 25°C)
Output Current 1 A
Driver ON-resistance High side: Typ. 0.4 Ω, Low side: Typ. 0.2 Ω
Oscillator Frequency Typ. 2 MHz
Package DFN3030-12B, HSOP-18

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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)		 3.3
VOUT
max (V)		 5.0
IOUT
(mA)		 1000
ISS
(µA)		 1000

Technical Documents

  • Typical Application

    Typical Application

  • DFN3030-12B PCB Example

    DFN3030-12B PCB Example

  • 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
R1271Lxx1x-TR-U
  • gradeConsumer
  • plp
 DFN3030-12B See datasheet R1271L-U
R1271Sxx1x-E2-FEU
  • gradeConsumer
  • plp
 HSOP-18 See datasheet R1271S-FEU
R1271Lxx1x-TR-YU
  • gradeIndustrial
  • plp
 DFN3030-12B See datasheet R1271L-YU
R1271Sxx1x-E2-YEU
  • gradeIndustrial
  • plp
 HSOP-18 See datasheet R1271S-YEU
R1271Lxx1x-TR-AU
  • gradeAutomotive
  • aecQ100
  • plp
 DFN3030-12B See datasheet R1271L-AU
R1271Lxx1x-TR-KU
  • gradeAutomotive
  • aecQ100
  • plp
 DFN3030-12B See datasheet R1271L-KU
R1271Sxx1x-E2-AEU
  • gradeAutomotive
  • aecQ100
  • plp
 HSOP-18 See datasheet R1271S-AEU
R1271Sxx1x-E2-KEU
  • gradeAutomotive
  • aecQ100
  • plp
 HSOP-18 See datasheet R1271S-KEU
  • 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.

Qualification Test Plan (QTP) Sheets

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Buy / Contact

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R1271 Series