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In a buck-boost DC-DC converter topology, the output voltage can be higher or lower than the input voltage. Often used in battery-operated equipment, a buck-boost DC-DC converter requires high-efficiency and ultra-low stand-by current as well as a small size to fit the requirements for portable and wearable devices for the Internet of Things (IoT).

We have a range of buck-boost regulators all featuring ultra-low quiescent current and high-efficiency hosted in space-saving packages in addition to evaluation and development boards to help develop and design compact, high-efficiency buck-boost DC-DC converters.

Part Number
Description
STEVAL-ISA109V1 800 mA, 3 MHz, high efficiency dual mode buck-boost DC-DC converter based on the STBB2 Quick view

Key Features

  • Input voltage: from 2.3 V to 5.5 V
  • Output voltage: 3.3 V
  • Output current: 800 mA
  • Operating frequency: 3 MHz
  • RoHS compliant

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Schematics BOM Gerber
STEVAL-ISA141V1 2 A, 2 MHz, Vout = 3.3 V, high-efficiency dual-mode buck-boost DC-DC converter based on the STBB3J Quick view

Key Features

  • Input voltage range from 1.8 V to 5.5 V
  • 2 A output current at 3.3 V in buck mode (VIN = 3.6 V to 5.5 V)
  • 800 mA output current at 3.3 V in boost mode (VIN 2.0 V)
  • Typical efficiency higher than 94%
  • ±2% DC feedback voltage tolerance
  • Automatic transition between step-down and boost mode
  • Adjustable output voltage from 1.2 V to 5.5 V
  • Power save mode (PS) at light load
  • 2.0 MHz fixed switching frequency
  • Adjustable switching frequency up to 2.4 MHz (external synchronous square signal)
  • Device quiescent current less than 50 µA
  • Load disconnect during shutdown
  • Shutdown and soft-start functions
  • Shutdown current <1 A
  • Available in Flip-Chip 20, pitch = 0.4 mm
  • RoHS compliant

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FEATURED RESOURCES

Schematics BOM Gerber
STEVAL-ISA063V2 1 A, high efficiency single inductor DC-DC converter based on the STBB1-APUR Quick view

Key Features

  • Buck-boost DC-DC converter
  • Operating input voltage range: 2.0 V to 5.5 V
  • 2% DC feedback voltage tolerance
  • Synchronous rectification
  • Shutdown function
  • 1.5 MHz switching frequency
  • Power save mode at light load
  • Typical efficiency: > 94%
  • 1 A output current capability
  • Shutdown current: < 1 μA
  • RoHS compliant

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FEATURED RESOURCES

Schematics BOM Gerber
Part Number
STEVAL-ISA109V1

800 mA, 3 MHz, high efficiency dual mode buck-boost DC-DC converter based on the STBB2

Key Features

  • Input voltage: from 2.3 V to 5.5 V
  • Output voltage: 3.3 V
  • Output current: 800 mA
  • Operating frequency: 3 MHz
  • RoHS compliant

Show More

IMAGE

Image
Image

FEATURED RESOURCES

Schematics BOM Gerber
STEVAL-ISA141V1

2 A, 2 MHz, Vout = 3.3 V, high-efficiency dual-mode buck-boost DC-DC converter based on the STBB3J

Key Features

  • Input voltage range from 1.8 V to 5.5 V
  • 2 A output current at 3.3 V in buck mode (VIN = 3.6 V to 5.5 V)
  • 800 mA output current at 3.3 V in boost mode (VIN 2.0 V)
  • Typical efficiency higher than 94%
  • ±2% DC feedback voltage tolerance
  • Automatic transition between step-down and boost mode
  • Adjustable output voltage from 1.2 V to 5.5 V
  • Power save mode (PS) at light load
  • 2.0 MHz fixed switching frequency
  • Adjustable switching frequency up to 2.4 MHz (external synchronous square signal)
  • Device quiescent current less than 50 µA
  • Load disconnect during shutdown
  • Shutdown and soft-start functions
  • Shutdown current <1 A
  • Available in Flip-Chip 20, pitch = 0.4 mm
  • RoHS compliant

Show More

IMAGE

Image
Image

FEATURED RESOURCES

Schematics BOM Gerber
STEVAL-ISA063V2

1 A, high efficiency single inductor DC-DC converter based on the STBB1-APUR

Key Features

  • Buck-boost DC-DC converter
  • Operating input voltage range: 2.0 V to 5.5 V
  • 2% DC feedback voltage tolerance
  • Synchronous rectification
  • Shutdown function
  • 1.5 MHz switching frequency
  • Power save mode at light load
  • Typical efficiency: > 94%
  • 1 A output current capability
  • Shutdown current: < 1 μA
  • RoHS compliant

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IMAGE

Image
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FEATURED RESOURCES

Schematics BOM Gerber
00 Files selected for download

Technical Documentation

    • Description Version Size Action
      AN1768
      ADMISSIBLE AVALANCHE POWER OF SCHOTTKY DIODES
      1.1
      46.82 KB
      PDF
      AN2025
      CONVERTER IMPROVEMENT USING SCHOTTKY RECTIFIER AVALANCHE SPECIFICATION
      1.1
      147.59 KB
      PDF
      AN604
      Calculation of conduction losses in a power rectifier
      3.2
      137.74 KB
      PDF
      AN4021
      Calculation of reverse losses in a power diode
      1.0
      120.47 KB
      PDF
      AN5028
      Calculation of turn-off power losses generated by a ultrafast diode
      1.0
      1.68 MB
      PDF
      AN4381
      Current sharing in parallel diodes
      1.0
      449.12 KB
      PDF
      AN1453
      NEW FAMILY OF 150V POWER SCHOTTKY
      1.1
      131.48 KB
      PDF
      AN4191
      Power MOSFET: Rg impact on applications
      1.2
      1.45 MB
      PDF
      AN5046
      Printed circuit board assembly recommendations for STMicroelectronics PowerFLAT packages
      4.0
      4.82 MB
      PDF
      AN5088
      Rectifiers thermal management, handling and mounting recommendations
      2.0
      2.32 MB
      PDF
      AN533
      SCRs, TRIACs, and AC switches, thermal management precautions for handling and mounting
      3.6
      217.19 KB
      PDF
      AN443
      SERIES OPERATION ON FAST RECTIFIERS
      2.1
      202.48 KB
      PDF
      AN1542
      THE THERMAL RUNAWAY LAW IN SCHOTTKY USED IN OR-ING APPLICATION
      1.1
      57.47 KB
      PDF
      AN869
      Tj max limit of Schottky diodes
      2.2
      60.9 KB
      PDF
      AN1768

      ADMISSIBLE AVALANCHE POWER OF SCHOTTKY DIODES

      AN2025

      CONVERTER IMPROVEMENT USING SCHOTTKY RECTIFIER AVALANCHE SPECIFICATION

      AN604

      Calculation of conduction losses in a power rectifier

      AN4021

      Calculation of reverse losses in a power diode

      AN5028

      Calculation of turn-off power losses generated by a ultrafast diode

      AN4381

      Current sharing in parallel diodes

      AN1453

      NEW FAMILY OF 150V POWER SCHOTTKY

      AN4191

      Power MOSFET: Rg impact on applications

      AN5046

      Printed circuit board assembly recommendations for STMicroelectronics PowerFLAT packages

      AN5088

      Rectifiers thermal management, handling and mounting recommendations

      AN533

      SCRs, TRIACs, and AC switches, thermal management precautions for handling and mounting

      AN443

      SERIES OPERATION ON FAST RECTIFIERS

      AN1542

      THE THERMAL RUNAWAY LAW IN SCHOTTKY USED IN OR-ING APPLICATION

      AN869

      Tj max limit of Schottky diodes

    • Description Version Size Action
      DN0011
      ST1S03 alternative topology: Using a buck in a negative buck-boost configuration
      1.2
      361.3 KB
      PDF
      DN0007
      STBB1 buck-boost converter used as a 500mA LED driver with 1.8VDC-5.5VDC Vin
      1.2
      187.67 KB
      PDF
      DN0011

      ST1S03 alternative topology: Using a buck in a negative buck-boost configuration

      DN0007

      STBB1 buck-boost converter used as a 500mA LED driver with 1.8VDC-5.5VDC Vin

Publications and Collaterals

    • Description Version Size Action
      Switching Converters (DC-DC) – Quick Reference Guide 1.0
      481.92 KB
      PDF

      Switching Converters (DC-DC) – Quick Reference Guide

eDesignSuite

Converter

Input

V This option is required. And must be less than or equal to Volt. Max [V]
V This option is required. And must be greater than or equal to Volt. Min [V]

Output Power

V This option is required and must be a number.
A This option is required and must be a number.

Power Management

Part number Description
STBB2 800 mA 2.5 MHz, high efficiency dual mode buck-boost DC-DC converter
STBB3J 2A, 2MHz, high efficiency dual mode buck-boost DC-DC converter
Part number
800 mA 2.5 MHz, high efficiency dual mode buck-boost DC-DC converter
2A, 2MHz, high efficiency dual mode buck-boost DC-DC converter