Started with the power management today. A couple of month ago, I found a very interesting ic from ST, the SRC0. It's a small on/off controller, which can be connected to a SMPS, so the power supply can be enabled / disabled by a simple press of the push-button. Furthermore it has an input for external signal, to disable the power (e.g. from microcontroller).

For the SMPS I would like to use the TI TPS63001 buck-boost converter. It provides a fixed +3,3V voltage output @ >1000mA current output (Vin = 2.6 - 4.2 VDC).
In this voltage range and at ca. 100mA load, the efficiency stays >90%, which is not so bad :)

For the charging circuit I'll use MCP73831. The circuit will be powered by 1 LiPo cell.