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R1272 Series

34V Input PWM/VFM Step-down DC/DC Controller with PLL Synchronization

  • Consumer
  • Industrial
  • Automotive
  • PLP
  • AEC-Q100
  • RoHS

The R1272 is a step-down DC/DC controller with synchronous rectifier and 34V input voltage. By the adoption of a unique current mode PWM architecture without an external current sense resistor, the R1272 can make up a stable DC/DC converter with high-efficiency even if adding low Ron MOSFETs and a low DCR inductor externally. In PLL_PWM mode, oscillator frequency is synchronized to an external clock frequency using a PLL and is effective for EMI control. For EMI reduction, SSCG (Spread-Spectrum Clock Generation) for diffused oscillation frequency at the PWM operation is optionally available.

Specs & Datasheets

  Consumer Industrial Automotive
Input Voltage Range 4.0 V to 34.0 V (36.0 V)
Operating Temperature Range -40°C to 105°C (125°C) -40°C to 105°C (125°C) -40°C to 125°C (150°C)
Supply Current Typ. 15 µA
Standby Current Typ. 3 µA
Start-up Voltage 4.5 V
Output Voltage Range Externally Adjustable: 0.7 V to 5.3 V
Feedback Voltage 0.64 V
Feedback Voltage Accuracy ±1%
Oscillator Frequency Externally Adjustable: 250 kHz to 1 MHz
Package HSOP-18

Download Datasheet

Protections / Functions

Functional Description

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

Technical Documents

Typical Application (at 1MHz)

Efficiency vs. Output Current

Efficiency vs. Output Current

Quality & Packages

Product Name Compatibility Package Marking Reliability
  • gradeConsumerC
  • plpP
HSOP-18 R1272S R1272S-FE
  • gradeIndustrialI
  • plpP
HSOP-18 R1272S R1272S-YE
  • gradeAutomotiveA
  • aecQ1001
  • plpP
HSOP-18 R1272S R1272S-KE
  • gradeAutomotiveA
  • aecQ1001
  • plpP
HSOP-18 R1272S R1272S-AE

Refer to the datasheets for the details on the product.
The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.
Please contact us or our distributors for unpublished reliability information.

Sample / Buy

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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