Overview

The RAA211820 is a DC/DC synchronous step-down (Buck) regulator that supports a 4.5V to 75V input voltage range and adjustable output voltage. It can deliver up to continuous 2A of continuous output current with premium load and line regulation performance.

The RAA211820 uses peak-current mode control architecture. Its PWM switching frequency is programmable to provide the best trade-off between transient response and efficiency. It also supports PFM operation and DEM to maximize light load efficiency, in addition to an external bias LDO input to further reduce power dissipation across the load range. The regulator also has an internal loop compensation circuit to reduce the external component count and BOM cost.

The RAA211820 provides useful functions such as internal or programmable soft-start and power good indicator. For safe operation, the RAA211820 also offers protection features such as cycle-by-cycle peak and valley current limit, input voltage UVLO, output voltage undervoltage (short-circuit) protection, and thermal shutdown.

RAA211820 Block Diagram
RAA211820 Typical Application Circuit
RAA211820 20 Ld QFN Pin Assignment
RAA211820 16 Ld HTSSOP Pin Assignment
RAA211820 Block Diagram
RAA211820 Typical Application Circuit
RAA211820 20 Ld QFN Pin Assignment
RAA211820 16 Ld HTSSOP Pin Assignment
  • Wide Vin operating range from 4.5V to 75V
  • Adjustable Vout from 0.8V to ~90% of Vin
  • Up to 2A of continuous output current
  • Default 400kHz or adjustable switching frequency from 200kHz to 800kHz
  • ±1% load regulation accuracy from -40°C to 125°C, ±0.5% load regulation accuracy at 25°C
  • 95μA typical quiescent current
  • Internal compensation, fixed 0.5ms SS for QFN and adjustable SS for HTSSOP
  • PFM operation and DEM at light load with integrated external bias LDO & Power Good indicator
  • Cycle-by-cycle peak and valley current limit, input voltage UVLO, output voltage undervoltage (short-circuit) protection and thermal shut down

Applications

  • Up to 75V distributed power supplies & general purposes POL
  • Telecommunication base station power supplies
  • Power tools
  • Surveillance
  • Portable mobility/robotic devices
  • Industrial power systems

Documentation

= Featured Documentation
Type Title Date
Datasheet
RAA211820 Datasheet
PDF 2.20 MB
1 item

Design & Development

Software & Tools
iSim:PE Offline Simulation Tool
iSim Personal Edition (iSim:PE) speeds the design cycle and reduces risk early in any project, identifying parts that can be used in current as well as next-generation designs.
Downloads
RAA211820 iSim:PE Model
 Simulator Renesas
1 item

Software Downloads
Type Title Date
Software & Tools - Other
RAA211630 Family Design Tool
Log in to Download XLSX 312 KB
1 item
RTKA211820DE0000BU

RTKA211820DE0000BU

Evaluation
Learn More

RAA211820 Synchronous Buck Evaluation Board with 4.5V to 75V Input Range, 3.3V 2A Output (QFN version)

The RTKA211820DE0000BU board evaluates the RAA211820 (QFN version), a DC/DC synchronous step-down regulator with programmable switching frequency. The RAA211820...

Featured Documents:
RTKA211820DE0000BU Evaluation Board Manual
RTKA211820DE0010BU

RTKA211820DE0010BU

Evaluation
Learn More

RAA211820 Synchronous Buck Evaluation Board with 4.5V to 75V Input Range, 3.3V 2A Output (HTSSOP version)

The RTKA211820DE0010BU board evaluates the RAA211820 (HTSSOP version), a DC/DC synchronous step-down regulator with programmable switching frequency. The RAA211820...

Featured Documents:
RTKA211820DE0010BU Evaluation Board Manual

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

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Diagram of ECAD Models

Product Options

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    PLP
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    Carrier Type
    Moisture Sensitivity Level (MSL)
    Price (USD) | 1ku
    Buy / Sample
    Part Number
    RAA211820GNP#HA0
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    Samples Available
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    		2033 Dec QFN Reel 3 1.968 Get Samples,
    RAA211820GSP#HA0
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    spa
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    Samples Available
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    		2033 Dec TSSOP-EP Reel 3 Get Samples,
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    Videos & Training

    Portfolio of 30V-75V Bucks Power the Highest-Precision Loads with Excellent Accuracy

    The RAA211x family of bucks are highly scalable due to its unique pin-compatible wide Vin buck variants with integrated FETs that support up to 5A of continuous output current with premium load and line regulation performance. The RAA211835 supports 75V async buck operation of 3A loadings, while RAA211250/450/630/820 support sync buck operation of 30V 5A, 40V 5A, 60V 3A, 75V 2A respectively.

    Video List
    Portfolio of 30V-75V Bucks Power the Highest-Precision Loads with Excellent Accuracy

    News & Blog Posts

    Blog Post May 8, 2023
    Blog Post Mar 17, 2023