STMicroelectronics ST779ACD-TR

Description
The ST777/778/779 are DC-DC converters that step-up from low voltage inputs, requiring only three external components: an inductor (typically 22µH) and two capacitors. The devices include a synchronous rectifier that eliminates the need for an external catch diode and allows regulation even when the input is greater than the output.
Unlike other step-up DC-DC converters, the ST777/778/779's synchronous rectifier turns off in shutdown mode, fully disconnecting the output from the source. This eliminates the current drain associated with conventional step-up converters in shutdown. Supply current is 270μA under no load and only 20μA in standby mode.

Features
1V to 6V input guarantees start-up under load
Maximum output current of 300mA (778 or 779 adjusted to 3V)
Load fully disconnected in shutdown
Typical efficiency of 82%
Internal 1A power switch and synchronous rectifier
Adjustable current limit allows low-cost inductors
Supply current of 270μA (no load)
Shutdown supply current 20μA
Package available: DIP-8 and SO-8

Applications
Battery-powered devices
Portable electronics
Power supplies
Industrial applications