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R1276 Series

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

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

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.

  • 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%).

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 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

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

Efficiency Characteristics (VOUT = 5V)

R1276 Typical Characteristics

Quality & Packages

Product Name Compatibility Package Marking Reliability
  • gradeConsumerC
  • plpP
HSOP-18 R1276S R1276S-FE
  • gradeIndustrialI
  • plpP
HSOP-18 R1276S R1276S-YE
  • gradeAutomotiveA
  • aecQ1001
  • plpP
HSOP-18 R1276S R1276S-AE
  • gradeAutomotiveA
  • aecQ1001
  • plpP
HSOP-18 R1276S R1276S-KE

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Please contact us or our distributors for unpublished reliability information.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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