Description
The STBB3J is a fixed frequency, high efficiency, buck-boost DC-DC converter which provides output voltages from 1.2 V to 5.5 V starting from input voltage from 1.8 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 cell lithium-Ion applications where the output voltage is within the battery voltage range. The low-RDS(on) N-channel and Pchannel MOSFET switches are integrated and contribute to achieve high efficiency. The MODE

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 (by external synchronous square signal)
■ Device quiescent current less than 50 μA
■ Load disconnect during shutdown
■ Shutdown function and soft-start
■ Shutdown current < 1 μA
■ Available in Flip Chip 20, pitch = 0.4 mm

Applications
■ Single cell Li-Ion, two-cell and three-cell alkaline, Ni-MH powered devices
■ Memory card supply
■ Tablet, smartphones
■ Digital cameras