ST STBB2 800mA 2.5MHz High Efficiency Dual Mode Buck-Boost DC-DC Converter Data Sheet User Manual
Summary
Optimize your portable electronics with the STBB2, a high-efficiency dual mode buck-boost DC-DC converter. Designed for applications ranging from cellular phones to Li-Ion systems, it reliably regulates output voltages between 1.2V and 4.5V across diverse input ranges (2.3V–5.5V) while maintaining typical efficiencies over 90%. This manual provides comprehensive technical documentation, including detailed schematics, electrical characteristics, essential layout guidelines, and best practices for component selection, ensuring easy integration of this power-saving core into your next design project.
Page 1 Text Content
STBB2
800 m A 2.5 MHz, high efficiency dual mode
buck-boost DC-DC converter
Datasheet − production data
Features Operating input voltage range from 2.3 V to 5.5 ± 2% output voltage tolerance over process and temperature variations Bypass power save function Selectable output voltage with dedicated VSEL pin
Flip Chip 20 (2.1x1.8 mm)
Very fast line and load transients 2.5 MHz switching frequency Power save mode (PS) at light load
selection between auto mode and forced PWM Typical efficiency higher than 90% mode, therefore benefiting from either lower power consumption or best dynamic
50 µA max. quiescent current
performance. The bypass function allows battery
Flip Chip 20 bumps 0.4 mm pitch 2.1 x 1.8 mm
power saving. In this operating mode the high- side switches are turned on so that the output Applications voltage is equal to the input voltage; in this condition the current consumption is reduced to a
Memory card supply maximum of 5 µA. The device includes also soft-
start control, thermal shutdown, and current limit.
Cellular phones
The STBB2 is packaged in Flip Chip 20 bumps with 0.4 mm pitch.
Description The STBB2 is a fixed frequency, high efficiency, buck-boost DC-DC converter able to provide output voltages from 1.2 V to 4.5 V starting from input voltage of 2.3 V to 5.5 V. The device can operate with input voltages higher than, equal to, or lower than the output voltage making the product suitable for single Li-Ion, multi-cell alkaline or Ni MH applications where the output voltage is within the battery voltage range. The low-RDSon N-channel and P-channel MOSFET switches are integrated and contribute to achieving high efficiency. The MODE pin allows Table 1. Device summary Order codes Markings Packaging Output voltages
STBB2JAD-R BB2 Tape and reel Adjustable STBB2J29-R B229 Tape and reel 2.9 V / 3.4 V
July 2012 Doc ID 022745 Rev 4 1/24 This is information on a product in full production. www.st.com
Page Summary Contents For ST STBB2 800mA 2.5MHz High Efficiency Dual Mode Buck-Boost DC-DC Converter Data Sheet User Manual
Manual Details
| Brand | Dual |
|---|---|
| Pages | 24 |
| File Size | 1.86 MB |
| Published | May 28, 2026 |
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Frequently Asked Questions
What types of batteries can this converter operate with?
It is suitable for single Li-Ion, multi-cell alkaline, or NiMH applications.
How do I set the required output voltage?
The device features a dedicated VSEL pin and supports adjustable outputs from 1.2V to 4.5V.
What built-in safety protections are available?
The converter includes soft-start control, thermal shutdown, and current limit protection.
Does the circuit feature a power-saving mode?
Yes, it uses a bypass function to reduce current consumption significantly (down to a maximum of 5 µA) in certain operating modes.