STBB3JR

STBB3JR is a fixed frequency, high efficiency, buck-boost DC-DC converter which provides output voltages from 1.2V to 5.5V starting from input voltage from 1.8V 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 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 pin allows the selection between auto mode and forced PWM mode, taking advantage from either lower power consumption or best dynamic performance. The device also includes soft-start control, thermal shutdown, and current limit. STBB3J is packaged in Flip Chip 20 bumps with 2.5 x 1.75mm. Typical applications include single cell li-Ion, two-cell and three-cell alkaline, Ni-MH powered devices, memory card supply, tablet, smartphones and digital cameras.

• 2A output current at 3.3V in buck mode (VIN = 3.6V to 5.5V)
• 800mA output current at 3.3V in boost mode (VIN 2.0V), shutdown current 1µA
• Typical efficiency higher than 94%
• ±2% DC feedback voltage tolerance
• Automatic transition between step-down and boost mode
• Power save mode (PS) at light load
• 2MHz fixed switching frequency
• Adjustable switching frequency up to 2.4MHz (by external synchronous square signal)
• Device quiescent current less than 50µA
• Load disconnect during shutdown, shutdown function and soft-start