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R1275 Series

2A 30V Input Forced PWM Step-down DC/DC Converter with Synchronous Rectifier

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

The R1275 is a 36-V synchronous step-down DC/DC converter with built-in drivers. It is designed for industrial equipment, OA equipment and home electronics that require a 24-V input.

It operates at a 2-MHz switching frequency, which allows to use a small inductor to ensure a high transient response and to maintain a high efficiency at heavy load condition. Using a spread spectrum clock generator, the EMI noise can be reduced.

Under cranking condition, the switching frequency is automatically reduced to keep output voltage level constant.

  • Provides a high switching frequency at 2 MHz with an efficiency of 87%.
  • Maintains the output voltage constant by reducing a switching frequency to the minimum 1/4 when an input-output voltage difference is small.
  • Achieves the EMI noise reduction by using a spread spectrum clock generator. (Diffusion Rate: +8%).

Specs & Datasheets

  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 105°C (125°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 Externally Adjustable: 3.3 V to 5.0 V
Feedback Voltage 0.64 V
Feedback Voltage Accuracy ±1.0%
Output Current 2 A
Driver ON-resistance High side: Typ. 0.145 Ω, Low side: Typ. 0.095 Ω
Oscillator Frequency Typ. 2 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

*1) Connecting a Schottky barrier diode between LX and GND can reduce the LX noise and improve the efficiency.

Efficiency (VOUT = 5 V)

Efficiency (VOUT = 5 V)

Quality & Packages

Product Name Compatibility Package Marking Reliability
  • gradeConsumerC
  • plpP
HSOP-18 R1275S R1275S-FE
  • gradeIndustrialI
  • plpP
HSOP-18 R1275S R1275S-YE
  • gradeAutomotiveA
  • aecQ1001
  • plpP
HSOP-18 R1275S R1275S-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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