Design Win Education

Ultra-low power and wide input dynamic buck-boost converter

Download datasheet

Product overview


The STBLW35 is an ultra-low power and high-efficiency buck-boost DC-DC converter which can work as boost or buck-boost according to the selected hardware configuration. When in buck-boost the DC-DC can seamlessly switch between the two working modes depending on operating conditions.

The IC shows very low power losses either in active or disable mode and provides an average output current between 33 mA to 70 mA, suitable to guarantee load minimum current constraints or to faster charge a battery. The device also allows the charge of any battery by tightly monitoring the end-of-charge and the minimum battery voltage in order to avoid overdischarge and to preserve battery life.

The power manager covers the input voltage range from 150 mV up to 18 V and guarantees high efficiency in both buck-boost and boost configuration.

Furthermore, the STBLW35 device shows very high flexibility thanks also to the trimming capability of the overvoltage and the undervoltage protection voltages.

In order to optimize the power consumption during system operation, the device can be driven in standby mode thanks to the high impedance Enable pin.

An unregulated voltage output is available (to supply a transceiver for instance), while two fully independent LDOs are embedded for powering sensors and other companion chips. Both LDOs (1.8 V and 3.3 V) can be independently enabled through dedicated pins.

  • All features

    • Seamless transition from Buck-Boost to Boost and vice versa working mode  
    • Up to 70 mA output current
    • Four fully integrated MOSFETs
    • Enable pin
    • 2.6 V to 5.3 V trimmable overvoltage level (± 1% accuracy)
    • 2.2 V to 3.6 V trimmable undervoltage level (± 1% accuracy)
    • Two fully independent LDOs (1.8 V and 3.3 V output)
    • Enable/disable LDO control pins
    • Load disconnect function at first switch-on
    • Embedded pass transistor status and DC-DC status open drain indication pins

EDA Symbols, Footprints and 3D Models

STMicroelectronics - STBLW35

Speed up your design by downloading all the EDA symbols, footprints and 3D models for your application. You have access to a large number of CAD formats to fit with your design toolchain.

Please select one model supplier :





3D model

3D models

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
VFQFPN 20 3x3 Industrial Ecopack2



VFQFPN 20 3x3

Material Declaration**:

Marketing Status



VFQFPN 20 3x3



RoHS Compliance Grade


(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

Sample & Buy

Swipe or click the button to explore more details Don't show this again
Part Number
Marketing Status
Budgetary Price (US$)*/Qty
Order from ST
Order from distributors
Packing Type
Country of Origin
Available at distributors

Distributor availability of STBLW35TTR

Distributor Name
Region Stock Min. Order Third party link

Distributor reported inventory date:

No availability of distributors reported, please contact our sales office


Budgetary Price (US$)*/Qty:
Packing Type:
Country of Origin:

Part Number:


Distributor Name

Distributor reported inventory date:

Swipe or click the button to explore more details Don't show this again

(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors