The 1.2MHz TPS61081 27V DC/DC converter combines a 1.3A current switch, input-tooutput isolation and a power diode. Supporting input voltages from 2.5 to 6V, the device is optimised to support single-cell lithium-ion batteries, as well as a three-cell NiMH battery pack or a regulated 5V input, such as a USB port. It also supports point-of-load voltages, such as 3.3 to 12V or 5 to 24V. The TPS61081 integrates a power MOSFET and power diode in a 3x3mm QFN package. Another version, the TPS61080, integrates a 0.5A current switch to support lower output current. Both converters feature a switching frequency of either 600kHz or 1.2MHz. The TPS61081 adds a level of protection to the overall power system: the device can survive (and protect external components from) a short-circuit situation on any single pin except the input-voltage pin.
