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STMicroelectronics DC-DC switching buck-boost regulator

High efficiency single inductor dual mode buck-boost DC-DC converter with 2.3 A switches peak current

STBB1-APUR is a fixed frequency, high efficiency, buck-boost DC-DC converter in a 10 pin DFN package. It provides output voltage ranging from 1.2V to 5.5V and input voltages from 2.0V to 5.5V. The device can operate with input voltages higher than, equal to, or lower than the output voltage making the product suitable for single lithium-Ion, multicell alkaline or NiMH applications where the output voltage is within the battery voltage range. The integrated low-R_DS(on) N-channel and P-channel MOSFET switches contribute to its high efficiency. The mode pin allows the selection between auto mode and forced PWM mode thus taking benefit either of lower power consumption or better dynamic performance. The device also includes soft-start control, thermal shutdown and current limit. Typical applications include single cell Li-Ion and 3 cells alkaline, Ni-MH powered devices, SD/MMC memory card supply, smart metering system, point of load regulation and portable equipment, IoT module.

Key features

2% DC feedback voltage tolerance
Synchronous rectification
Shutdown function
1.5MHz switching frequency
Power save mode at light load
Typical efficiency of <gt/> 94%
2.3A switches peak current limit at 3.3V
Shutdown current <lt/> 1µA
Available in DFN10 (3 x 3 mm)
Buck-boost DC-DC converter
Operating input voltage range from 2.0 V to 5.5 V

Applications

Single cell Li-Ion and 3 cells alkaline, Ni-MH powered devices
SD/MMC memory card supply
Smart metering system
Point of load regulation
Portable equipment, IoT module

Available tools

STEVAL-ISA076V1:

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

The STEVAL-ISA063V2 demonstration board implements a typical buck-boost DC-DC converter based on STMicroelectronics’ STBB1-APUR high efficiency single inductor dual mode buck-boost DC-DC converter. The device is fixed frequency and capable of providing output voltages ranging from 1.2 V to 5.5 V and input voltages from 2.0 V to 5.5 V.

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