The STBB3JR is a fixed frequency high efficiency buck-boost DC-to-DC Converter which provides output voltage from 1.2 to 5.5V starting from input voltage from 1.8 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 P-channel 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.
● Automatic transition between step-down and boost mode
● Power save mode (PS) at light load
● Load disconnect during shutdown
● Shutdown function and soft-start
● Typical efficiency higher than 94%
● Adjustable switching frequency up to 2.4MHz (by external synchronous square signal)
● Device quiescent current less than 50µA
● 800mA Output current at 3.3V in boost mode (VIN 2V)
● ±2% DC feedback voltage tolerance
● <1µA Shutdown current
