Description
The STBB1 is a fixed frequency, high efficiency, Buck-boost DC-DC converter able to provide output voltages ranging from 1.2 V to 5.5 V and input voltage from 2.0 V to 5.5 V. The device can operate with input voltages higher, equal 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-RDSon N-channel and Pchannel MOSFET switches contribute to achieve high efficiency. The MODE pin allows selecting between auto mode and forced PWM mode thus taking benefit either of lower power consumption or best dynamic performance. The device includes also soft-start control, thermal shutdown and current limit. The STBB1 is packaged in DFN10 3x3 mm. DFN10 (3 x 3 mm)

Features
■ Buck-boost DC-DC converter
■ Operating input voltage range from 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
■ Available in DFN10 3 x 3 mm

Applications
■ Single cell LI-ION and 3 cells alkaline, NI-MH powered devices
■ Memory SD/MMC cards supply
■ Palmtop computers
■ Cell phones
■ Digital cameras