DescriptionThe STBB1XX 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 voltages from 2.0 V to 5.5 V. The device can operate with input voltages higher 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 P-channel MOSFET switches contribute to its 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 STBB1XX is packaged in DFN10 3 x 3 mm.DFN10 (3 x 3 mm.)Table 1.Device summaryPart numbersOrder codesMarkingOutput voltageSTBB1XXSTBB1PURBB1ADJwww.st.comContents STBB1XX 2/21 Contents1Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Features Buck-boost DC-DC converterOperating input voltage range from 2.0 V to5.5 V2% DC feedback voltage toleranceSynchronous rectificationShutdown function1.5 MHz switching frequencyPower save mode at light loadTypical efficiency: > 94 %1 A output current capabilityShutdown current < 1 AAvailable in DFN10 3 x 3 mm.Application Single cell Li-Ion and 3 cells alkaline, Ni-MH powered devicesSD/MMC memory card supplyPalmtop computersCell phonesDigital camerasDescriptionThe STBB1XX 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 voltages from 2.0 V to 5.5 V. The device can operate with input voltages higher 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 P-channel MOSFET switches contribute to its high efficiency.The MODE pin allows selecting between auto mode a specifications, grade definitions and pr